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

/*-
* Copyright (c) 2007 John Birrell ([email protected])
* Copyright (c) 2009,2011,2014 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_die.c,v 1.5 2024/03/03 17:37:30 christos Exp $");
ELFTC_VCSID("Id: dwarf_die.c 3039 2014-05-18 15:10:56Z kaiwang27");

int
dwarf_child(Dwarf_Die die, Dwarf_Die *ret_die, Dwarf_Error *error)
{
       Dwarf_Debug dbg;
       Dwarf_Section *ds;
       Dwarf_CU cu;
       int ret;

       dbg = die != NULL ? die->die_dbg : NULL;

       if (die == NULL || ret_die == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (die->die_ab->ab_children == DW_CHILDREN_no)
               return (DW_DLV_NO_ENTRY);

       dbg = die->die_dbg;
       cu = die->die_cu;
       ds = cu->cu_is_info ? dbg->dbg_info_sec : dbg->dbg_types_sec;
       ret = _dwarf_die_parse(die->die_dbg, ds, cu, cu->cu_dwarf_size,
           die->die_next_off, cu->cu_next_offset, ret_die, 0, error);

       if (ret == DW_DLE_NO_ENTRY) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       } else if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       return (DW_DLV_OK);
}

int
dwarf_siblingof_b(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Die *ret_die,
   Dwarf_Bool is_info, Dwarf_Error *error)
{
       Dwarf_CU cu;
       Dwarf_Attribute at;
       Dwarf_Section *ds;
       uint64_t offset;
       int ret, search_sibling;

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

       ds = is_info ? dbg->dbg_info_sec : dbg->dbg_types_sec;
       cu = is_info ? dbg->dbg_cu_current : dbg->dbg_tu_current;

       if (cu == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_DIE_NO_CU_CONTEXT);
               return (DW_DLV_ERROR);
       }

       /* Application requests the first DIE in this CU. */
       if (die == NULL)
               return (dwarf_offdie_b(dbg, cu->cu_1st_offset, is_info,
                   ret_die, error));

       /*
        * Check if the `is_info' flag matches the debug section the
        * DIE belongs to.
        */
       if (is_info != die->die_cu->cu_is_info) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       /*
        * If the DIE doesn't have any children, its sibling sits next
        * right to it.
        */
       search_sibling = 0;
       if (die->die_ab->ab_children == DW_CHILDREN_no)
               offset = die->die_next_off;
       else {
               /*
                * Look for DW_AT_sibling attribute for the offset of
                * its sibling.
                */
               if ((at = _dwarf_attr_find(die, DW_AT_sibling)) != NULL) {
                       if (at->at_form != DW_FORM_ref_addr)
                               offset = at->u[0].u64 + cu->cu_offset;
                       else
                               offset = at->u[0].u64;
               } else {
                       offset = die->die_next_off;
                       search_sibling = 1;
               }
       }

       ret = _dwarf_die_parse(die->die_dbg, ds, cu, cu->cu_dwarf_size, offset,
           cu->cu_next_offset, ret_die, search_sibling, error);

       if (ret == DW_DLE_NO_ENTRY) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       } else if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       return (DW_DLV_OK);
}


int
dwarf_siblingof(Dwarf_Debug dbg, Dwarf_Die die, Dwarf_Die *ret_die,
   Dwarf_Error *error)
{

       return (dwarf_siblingof_b(dbg, die, ret_die, 1, error));
}

static int
_dwarf_search_die_within_cu(Dwarf_Debug dbg, Dwarf_Section *s, Dwarf_CU cu,
   Dwarf_Off offset, Dwarf_Die *ret_die, Dwarf_Error *error)
{

       assert(dbg != NULL && cu != NULL && ret_die != NULL);

       return (_dwarf_die_parse(dbg, s, cu, cu->cu_dwarf_size,
           offset, cu->cu_next_offset, ret_die, 0, error));
}

int
dwarf_offdie_b(Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Bool is_info,
   Dwarf_Die *ret_die, Dwarf_Error *error)
{
       Dwarf_Section *ds;
       Dwarf_CU cu;
       int ret;

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

       ds = is_info ? dbg->dbg_info_sec : dbg->dbg_types_sec;
       cu = is_info ? dbg->dbg_cu_current : dbg->dbg_tu_current;

       /* First search the current CU. */
       if (cu != NULL) {
               if (offset > cu->cu_offset && offset < cu->cu_next_offset) {
                       ret = _dwarf_search_die_within_cu(dbg, ds, cu, offset,
                           ret_die, error);
                       if (ret == DW_DLE_NO_ENTRY) {
                               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                               return (DW_DLV_NO_ENTRY);
                       } else if (ret != DW_DLE_NONE)
                               return (DW_DLV_ERROR);
                       return (DW_DLV_OK);
               }
       }

       /* Search other CUs. */
       ret = _dwarf_info_load(dbg, 1, is_info, error);
       if (ret != DW_DLE_NONE)
               return (DW_DLV_ERROR);

       if (is_info) {
               STAILQ_FOREACH(cu, &dbg->dbg_cu, cu_next) {
                       if (offset < cu->cu_offset ||
                           offset > cu->cu_next_offset)
                               continue;
                       ret = _dwarf_search_die_within_cu(dbg, ds, cu, offset,
                           ret_die, error);
                       if (ret == DW_DLE_NO_ENTRY) {
                               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                               return (DW_DLV_NO_ENTRY);
                       } else if (ret != DW_DLE_NONE)
                               return (DW_DLV_ERROR);
                       return (DW_DLV_OK);
               }
       } else {
               STAILQ_FOREACH(cu, &dbg->dbg_tu, cu_next) {
                       if (offset < cu->cu_offset ||
                           offset > cu->cu_next_offset)
                               continue;
                       ret = _dwarf_search_die_within_cu(dbg, ds, cu, offset,
                           ret_die, error);
                       if (ret == DW_DLE_NO_ENTRY) {
                               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                               return (DW_DLV_NO_ENTRY);
                       } else if (ret != DW_DLE_NONE)
                               return (DW_DLV_ERROR);
                       return (DW_DLV_OK);
               }
       }

       DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
       return (DW_DLV_NO_ENTRY);
}

int
dwarf_offdie(Dwarf_Debug dbg, Dwarf_Off offset, Dwarf_Die *ret_die,
   Dwarf_Error *error)
{

       return (dwarf_offdie_b(dbg, offset, 1, ret_die, error));
}

int
dwarf_tag(Dwarf_Die die, Dwarf_Half *tag, Dwarf_Error *error)
{
       Dwarf_Debug dbg;

       dbg = die != NULL ? die->die_dbg : NULL;

       if (die == NULL || tag == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       assert(die->die_ab != NULL);

       *tag = (Dwarf_Half) die->die_ab->ab_tag;

       return (DW_DLV_OK);
}

int
dwarf_dieoffset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *error)
{
       Dwarf_Debug dbg;

       dbg = die != NULL ? die->die_dbg : NULL;

       if (die == NULL || ret_offset == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       *ret_offset = die->die_offset;

       return (DW_DLV_OK);
}

int
dwarf_die_CU_offset(Dwarf_Die die, Dwarf_Off *ret_offset, Dwarf_Error *error)
{
       Dwarf_Debug dbg;
       Dwarf_CU cu;

       dbg = die != NULL ? die->die_dbg : NULL;

       if (die == NULL || ret_offset == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       cu = die->die_cu;
       assert(cu != NULL);

       *ret_offset = die->die_offset - cu->cu_offset;

       return (DW_DLV_OK);
}

int
dwarf_die_CU_offset_range(Dwarf_Die die, Dwarf_Off *cu_offset,
   Dwarf_Off *cu_length, Dwarf_Error *error)
{
       Dwarf_Debug dbg;
       Dwarf_CU cu;

       dbg = die != NULL ? die->die_dbg : NULL;

       if (die == NULL || cu_offset == NULL || cu_length == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       cu = die->die_cu;
       assert(cu != NULL);

       *cu_offset = cu->cu_offset;
       *cu_length = cu->cu_length + cu->cu_length_size;

       return (DW_DLV_OK);
}

int
dwarf_diename(Dwarf_Die die, char **ret_name, Dwarf_Error *error)
{
       Dwarf_Debug dbg;

       dbg = die != NULL ? die->die_dbg : NULL;

       if (die == NULL || ret_name == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
               return (DW_DLV_ERROR);
       }

       if (die->die_name == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       }

       *ret_name = die->die_name;

       return (DW_DLV_OK);
}

int
dwarf_die_abbrev_code(Dwarf_Die die)
{

       assert(die != NULL);

       return (die->die_abnum);
}

int
dwarf_get_cu_die_offset_given_cu_header_offset_b(Dwarf_Debug dbg,
   Dwarf_Off in_cu_header_offset, Dwarf_Bool is_info,
   Dwarf_Off *out_cu_die_offset, Dwarf_Error *error)
{
       Dwarf_CU cu;

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

       if (is_info) {
               STAILQ_FOREACH(cu, &dbg->dbg_cu, cu_next) {
                       if (cu->cu_offset == in_cu_header_offset) {
                               *out_cu_die_offset = cu->cu_1st_offset;
                               break;
                       }
               }
       } else {
               STAILQ_FOREACH(cu, &dbg->dbg_tu, cu_next) {
                       if (cu->cu_offset == in_cu_header_offset) {
                               *out_cu_die_offset = cu->cu_1st_offset;
                               break;
                       }
               }
       }

       if (cu == NULL) {
               DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
               return (DW_DLV_NO_ENTRY);
       }

       return (DW_DLV_OK);
}

int
dwarf_get_cu_die_offset_given_cu_header_offset(Dwarf_Debug dbg,
   Dwarf_Off in_cu_header_offset, Dwarf_Off *out_cu_die_offset,
   Dwarf_Error *error)
{

       return (dwarf_get_cu_die_offset_given_cu_header_offset_b(dbg,
           in_cu_header_offset, 1, out_cu_die_offset, error));
}

int
dwarf_get_address_size(Dwarf_Debug dbg, Dwarf_Half *addr_size,
   Dwarf_Error *error)
{

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

       *addr_size = dbg->dbg_pointer_size;

       return (DW_DLV_OK);
}

Dwarf_Bool
dwarf_get_die_infotypes_flag(Dwarf_Die die)
{

       assert(die != NULL);

       return (die->die_cu->cu_is_info);
}

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