contrib/elftoolchain/libdwarf/dwarf_cu.c

   1 /*-
   2  * Copyright (c) 2007 John Birrell (jb@freebsd.org)
   3  * Copyright (c) 2014 Kai Wang
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include "_libdwarf.h"
  29
  30 ELFTC_VCSID("$Id: dwarf_cu.c 3041 2014-05-18 15:11:03Z kaiwang27 $");
  31
  32 int
  33 dwarf_next_cu_header_c(Dwarf_Debug dbg, Dwarf_Bool is_info,
  34     Dwarf_Unsigned *cu_length, Dwarf_Half *cu_version,
  35     Dwarf_Off *cu_abbrev_offset, Dwarf_Half *cu_pointer_size,
  36     Dwarf_Half *cu_offset_size, Dwarf_Half *cu_extension_size,
  37     Dwarf_Sig8 *type_signature, Dwarf_Unsigned *type_offset,
  38     Dwarf_Unsigned *cu_next_offset, Dwarf_Error *error)
  39 {
  40         Dwarf_CU cu;
  41         int ret;
  42
  43         if (dbg == NULL) {
  44                 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
  45                 return (DW_DLV_ERROR);
  46         }
  47
  48         if (is_info) {
  49                 if (dbg->dbg_cu_current == NULL)
  50                         ret = _dwarf_info_first_cu(dbg, error);
  51                 else
  52                         ret = _dwarf_info_next_cu(dbg, error);
  53         } else {
  54                 if (dbg->dbg_tu_current == NULL)
  55                         ret = _dwarf_info_first_tu(dbg, error);
  56                 else
  57                         ret = _dwarf_info_next_tu(dbg, error);
  58         }
  59
  60         if (ret == DW_DLE_NO_ENTRY) {
  61                 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
  62                 return (DW_DLV_NO_ENTRY);
  63         } else if (ret != DW_DLE_NONE)
  64                 return (DW_DLV_ERROR);
  65
  66         if (is_info) {
  67                 if (dbg->dbg_cu_current == NULL) {
  68                         DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
  69                         return (DW_DLV_NO_ENTRY);
  70                 }
  71                 cu = dbg->dbg_cu_current;
  72         } else {
  73                 if (dbg->dbg_tu_current == NULL) {
  74                         DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
  75                         return (DW_DLV_NO_ENTRY);
  76                 }
  77                 cu = dbg->dbg_tu_current;
  78         }
  79
  80         if (cu_length)
  81                 *cu_length = cu->cu_length;
  82         if (cu_version)
  83                 *cu_version = cu->cu_version;
  84         if (cu_abbrev_offset)
  85                 *cu_abbrev_offset = (Dwarf_Off) cu->cu_abbrev_offset;
  86         if (cu_pointer_size)
  87                 *cu_pointer_size = cu->cu_pointer_size;
  88         if (cu_offset_size) {
  89                 if (cu->cu_length_size == 4)
  90                         *cu_offset_size = 4;
  91                 else
  92                         *cu_offset_size = 8;
  93         }
  94         if (cu_extension_size) {
  95                 if (cu->cu_length_size == 4)
  96                         *cu_extension_size = 0;
  97                 else
  98                         *cu_extension_size = 4;
  99         }
 100         if (cu_next_offset)
 101                 *cu_next_offset = cu->cu_next_offset;
 102
 103         if (!is_info) {
 104                 if (type_signature)
 105                         *type_signature = cu->cu_type_sig;
 106                 if (type_offset)
 107                         *type_offset = cu->cu_type_offset;
 108         }
 109
 110         return (DW_DLV_OK);
 111 }
 112
 113
 114 int
 115 dwarf_next_cu_header_b(Dwarf_Debug dbg, Dwarf_Unsigned *cu_length,
 116     Dwarf_Half *cu_version, Dwarf_Off *cu_abbrev_offset,
 117     Dwarf_Half *cu_pointer_size, Dwarf_Half *cu_offset_size,
 118     Dwarf_Half *cu_extension_size, Dwarf_Unsigned *cu_next_offset,
 119     Dwarf_Error *error)
 120 {
 121
 122         return (dwarf_next_cu_header_c(dbg, 1, cu_length, cu_version,
 123             cu_abbrev_offset, cu_pointer_size, cu_offset_size,
 124             cu_extension_size, NULL, NULL, cu_next_offset, error));
 125 }
 126
 127 int
 128 dwarf_next_cu_header(Dwarf_Debug dbg, Dwarf_Unsigned *cu_length,
 129     Dwarf_Half *cu_version, Dwarf_Off *cu_abbrev_offset,
 130     Dwarf_Half *cu_pointer_size, Dwarf_Unsigned *cu_next_offset,
 131     Dwarf_Error *error)
 132 {
 133
 134         return (dwarf_next_cu_header_b(dbg, cu_length, cu_version,
 135             cu_abbrev_offset, cu_pointer_size, NULL, NULL, cu_next_offset,
 136             error));
 137 }
 138
 139 int
 140 dwarf_next_types_section(Dwarf_Debug dbg, Dwarf_Error *error)
 141 {
 142
 143         /* Free resource allocated for current .debug_types section. */
 144         _dwarf_type_unit_cleanup(dbg);
 145         dbg->dbg_types_loaded = 0;
 146         dbg->dbg_types_off = 0;
 147
 148         /* Reset type unit pointer. */
 149         dbg->dbg_tu_current = NULL;
 150
 151         /* Search for the next .debug_types section. */
 152         dbg->dbg_types_sec = _dwarf_find_next_types_section(dbg,
 153             dbg->dbg_types_sec);
 154
 155         if (dbg->dbg_types_sec == NULL) {
 156                 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
 157                 return (DW_DLV_NO_ENTRY);
 158         }
 159
 160         return (DW_DLV_OK);
 161 }