contrib/elftoolchain/libdwarf/dwarf_abbrev.c

   1 /*-
   2  * Copyright (c) 2009,2011 Kai Wang
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include "_libdwarf.h"
  28
  29 ELFTC_VCSID("$Id: dwarf_abbrev.c 2072 2011-10-27 03:26:49Z jkoshy $");
  30
  31 int
  32 dwarf_get_abbrev(Dwarf_Debug dbg, Dwarf_Unsigned offset,
  33     Dwarf_Abbrev *return_abbrev, Dwarf_Unsigned *length,
  34     Dwarf_Unsigned *attr_count, Dwarf_Error *error)
  35 {
  36         Dwarf_Abbrev ab;
  37         int ret;
  38
  39         if (dbg == NULL || return_abbrev == NULL || length == NULL ||
  40             attr_count == NULL) {
  41                 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
  42                 return (DW_DLV_ERROR);
  43         }
  44
  45         ret = _dwarf_abbrev_parse(dbg, NULL, &offset, &ab, error);
  46         if (ret != DW_DLE_NONE) {
  47                 if (ret == DW_DLE_NO_ENTRY) {
  48                         DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
  49                         return (DW_DLV_NO_ENTRY);
  50                 } else
  51                         return (DW_DLV_ERROR);
  52         }
  53
  54         *return_abbrev = ab;
  55         *length = ab->ab_length;
  56         *attr_count = ab->ab_atnum;
  57
  58         return (DW_DLV_OK);
  59 }
  60
  61 int
  62 dwarf_get_abbrev_tag(Dwarf_Abbrev abbrev, Dwarf_Half *return_tag,
  63     Dwarf_Error *error)
  64 {
  65
  66         if (abbrev == NULL || return_tag == NULL) {
  67                 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
  68                 return (DW_DLV_ERROR);
  69         }
  70
  71         *return_tag = (Dwarf_Half) abbrev->ab_tag;
  72
  73         return (DW_DLV_OK);
  74 }
  75
  76 int
  77 dwarf_get_abbrev_code(Dwarf_Abbrev abbrev, Dwarf_Unsigned *return_code,
  78     Dwarf_Error *error)
  79 {
  80
  81         if (abbrev == NULL || return_code == NULL) {
  82                 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
  83                 return (DW_DLV_ERROR);
  84         }
  85
  86         *return_code = abbrev->ab_entry;
  87
  88         return (DW_DLV_OK);
  89 }
  90
  91 int
  92 dwarf_get_abbrev_children_flag(Dwarf_Abbrev abbrev, Dwarf_Signed *return_flag,
  93     Dwarf_Error *error)
  94 {
  95
  96         if (abbrev == NULL || return_flag == NULL) {
  97                 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
  98                 return (DW_DLV_ERROR);
  99         }
 100
 101         *return_flag = (Dwarf_Signed) abbrev->ab_children;
 102
 103         return (DW_DLV_OK);
 104 }
 105
 106 int
 107 dwarf_get_abbrev_entry(Dwarf_Abbrev abbrev, Dwarf_Signed ndx,
 108     Dwarf_Half *attr_num, Dwarf_Signed *form, Dwarf_Off *offset,
 109     Dwarf_Error *error)
 110 {
 111         Dwarf_AttrDef ad;
 112         int i;
 113
 114         if (abbrev == NULL || attr_num == NULL || form == NULL ||
 115             offset == NULL) {
 116                 DWARF_SET_ERROR(NULL, error, DW_DLE_ARGUMENT);
 117                 return (DW_DLV_ERROR);
 118         }
 119
 120         if (ndx < 0 || (uint64_t) ndx >= abbrev->ab_atnum) {
 121                 DWARF_SET_ERROR(NULL, error, DW_DLE_NO_ENTRY);
 122                 return (DW_DLV_NO_ENTRY);
 123         }
 124
 125         ad = STAILQ_FIRST(&abbrev->ab_attrdef);
 126         for (i = 0; i < ndx && ad != NULL; i++)
 127                 ad = STAILQ_NEXT(ad, ad_next);
 128
 129         assert(ad != NULL);
 130
 131         *attr_num = ad->ad_attrib;
 132         *form = ad->ad_form;
 133         *offset = ad->ad_offset;
 134
 135         return (DW_DLV_OK);
 136 }