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

/*-
* Copyright (c) 2007 John Birrell ([email protected])
* Copyright (c) 2014,2023 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_cu.c,v 1.5 2024/03/03 17:37:30 christos Exp $");
ELFTC_VCSID("Id: dwarf_cu.c 4013 2023-10-14 22:40:50Z kaiwang27");

int
dwarf_next_cu_header_d(Dwarf_Debug dbg, Dwarf_Bool is_info,
   Dwarf_Unsigned *cu_length, Dwarf_Half *cu_version,
   Dwarf_Off *cu_abbrev_offset, Dwarf_Half *cu_pointer_size,
   Dwarf_Half *cu_offset_size, Dwarf_Half *cu_extension_size,
   Dwarf_Sig8 *type_signature, Dwarf_Unsigned *type_offset,
   Dwarf_Unsigned *cu_next_offset, Dwarf_Half *cu_type,
   Dwarf_Error *error)
{
       Dwarf_CU cu;
       int ret;

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

       if (is_info) {
               if (dbg->dbg_cu_current == NULL)
                       ret = _dwarf_info_first_cu(dbg, error);
               else
                       ret = _dwarf_info_next_cu(dbg, error);
       } else {
               if (dbg->dbg_tu_current == NULL)
                       ret = _dwarf_info_first_tu(dbg, error);
               else
                       ret = _dwarf_info_next_tu(dbg, 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);

       if (is_info) {
               if (dbg->dbg_cu_current == NULL) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                       return (DW_DLV_NO_ENTRY);
               }
               cu = dbg->dbg_cu_current;
       } else {
               if (dbg->dbg_tu_current == NULL) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
                       return (DW_DLV_NO_ENTRY);
               }
               cu = dbg->dbg_tu_current;
       }

       if (cu_length)
               *cu_length = cu->cu_length;
       if (cu_version)
               *cu_version = cu->cu_version;
       if (cu_abbrev_offset)
               *cu_abbrev_offset = (Dwarf_Off) cu->cu_abbrev_offset;
       if (cu_pointer_size)
               *cu_pointer_size = cu->cu_pointer_size;
       if (cu_offset_size) {
               if (cu->cu_length_size == 4)
                       *cu_offset_size = 4;
               else
                       *cu_offset_size = 8;
       }
       if (cu_extension_size) {
               if (cu->cu_length_size == 4)
                       *cu_extension_size = 0;
               else
                       *cu_extension_size = 4;
       }
       if (cu_next_offset)
               *cu_next_offset = cu->cu_next_offset;

       if (!is_info) {
               if (type_signature)
                       *type_signature = cu->cu_type_sig;
               if (type_offset)
                       *type_offset = cu->cu_type_offset;
       }

       if (cu_type)
               *cu_type = cu->cu_unit_type;

       return (DW_DLV_OK);
}

int
dwarf_next_cu_header_c(Dwarf_Debug dbg, Dwarf_Bool is_info,
   Dwarf_Unsigned *cu_length, Dwarf_Half *cu_version,
   Dwarf_Off *cu_abbrev_offset, Dwarf_Half *cu_pointer_size,
   Dwarf_Half *cu_offset_size, Dwarf_Half *cu_extension_size,
   Dwarf_Sig8 *type_signature, Dwarf_Unsigned *type_offset,
   Dwarf_Unsigned *cu_next_offset, Dwarf_Error *error)
{

       return (dwarf_next_cu_header_d(dbg, 1, cu_length, cu_version,
           cu_abbrev_offset, cu_pointer_size, cu_offset_size,
           cu_extension_size, NULL, NULL, cu_next_offset, NULL, error));
}


int
dwarf_next_cu_header_b(Dwarf_Debug dbg, Dwarf_Unsigned *cu_length,
   Dwarf_Half *cu_version, Dwarf_Off *cu_abbrev_offset,
   Dwarf_Half *cu_pointer_size, Dwarf_Half *cu_offset_size,
   Dwarf_Half *cu_extension_size, Dwarf_Unsigned *cu_next_offset,
   Dwarf_Error *error)
{

       return (dwarf_next_cu_header_c(dbg, 1, cu_length, cu_version,
           cu_abbrev_offset, cu_pointer_size, cu_offset_size,
           cu_extension_size, NULL, NULL, cu_next_offset, error));
}

int
dwarf_next_cu_header(Dwarf_Debug dbg, Dwarf_Unsigned *cu_length,
   Dwarf_Half *cu_version, Dwarf_Off *cu_abbrev_offset,
   Dwarf_Half *cu_pointer_size, Dwarf_Unsigned *cu_next_offset,
   Dwarf_Error *error)
{

       return (dwarf_next_cu_header_b(dbg, cu_length, cu_version,
           cu_abbrev_offset, cu_pointer_size, NULL, NULL, cu_next_offset,
           error));
}

int
dwarf_next_types_section(Dwarf_Debug dbg, Dwarf_Error *error)
{

       /* Free resource allocated for current .debug_types section. */
       _dwarf_type_unit_cleanup(dbg);
       dbg->dbg_types_loaded = 0;
       dbg->dbg_types_off = 0;

       /* Reset type unit pointer. */
       dbg->dbg_tu_current = NULL;

       /* Search for the next .debug_types section. */
       dbg->dbg_types_sec = _dwarf_find_next_types_section(dbg,
           dbg->dbg_types_sec);

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

       return (DW_DLV_OK);
}

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