1 /*- 2 * Copyright (c) 2007 John Birrell (jb@freebsd.org) 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_attrval.c 3509 2016-12-29 03:58:41Z emaste $"); 30 31 int 32 dwarf_attrval_flag(Dwarf_Die die, Dwarf_Half attr, Dwarf_Bool *valp, Dwarf_Error *err) 33 { 34 Dwarf_Attribute at; 35 Dwarf_Debug dbg; 36 37 dbg = die != NULL ? die->die_dbg : NULL; 38 39 if (die == NULL || valp == NULL) { 40 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT); 41 return (DW_DLV_ERROR); 42 } 43 44 *valp = 0; 45 46 if ((at = _dwarf_attr_find(die, attr)) == NULL) { 47 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY); 48 return (DW_DLV_NO_ENTRY); 49 } 50 51 switch (at->at_form) { 52 case DW_FORM_flag: 53 case DW_FORM_flag_present: 54 *valp = (Dwarf_Bool) (!!at->u[0].u64); 55 break; 56 default: 57 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD); 58 return (DW_DLV_ERROR); 59 } 60 61 return (DW_DLV_OK); 62 } 63 64 int 65 dwarf_attrval_string(Dwarf_Die die, Dwarf_Half attr, const char **strp, Dwarf_Error *err) 66 { 67 Dwarf_Attribute at; 68 Dwarf_Debug dbg; 69 70 dbg = die != NULL ? die->die_dbg : NULL; 71 72 if (die == NULL || strp == NULL) { 73 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT); 74 return (DW_DLV_ERROR); 75 } 76 77 *strp = NULL; 78 79 if ((at = _dwarf_attr_find(die, attr)) == NULL) { 80 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY); 81 return (DW_DLV_NO_ENTRY); 82 } 83 84 switch (at->at_form) { 85 case DW_FORM_strp: 86 *strp = at->u[1].s; 87 break; 88 case DW_FORM_string: 89 *strp = at->u[0].s; 90 break; 91 default: 92 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD); 93 return (DW_DLV_ERROR); 94 } 95 96 return (DW_DLV_OK); 97 } 98 99 int 100 dwarf_attrval_signed(Dwarf_Die die, Dwarf_Half attr, Dwarf_Signed *valp, Dwarf_Error *err) 101 { 102 Dwarf_Attribute at; 103 Dwarf_Debug dbg; 104 105 dbg = die != NULL ? die->die_dbg : NULL; 106 107 if (die == NULL || valp == NULL) { 108 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT); 109 return (DW_DLV_ERROR); 110 } 111 112 *valp = 0; 113 114 if ((at = _dwarf_attr_find(die, attr)) == NULL) { 115 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY); 116 return (DW_DLV_NO_ENTRY); 117 } 118 119 switch (at->at_form) { 120 case DW_FORM_data1: 121 *valp = (int8_t) at->u[0].s64; 122 break; 123 case DW_FORM_data2: 124 *valp = (int16_t) at->u[0].s64; 125 break; 126 case DW_FORM_data4: 127 *valp = (int32_t) at->u[0].s64; 128 break; 129 case DW_FORM_data8: 130 case DW_FORM_sdata: 131 *valp = at->u[0].s64; 132 break; 133 default: 134 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD); 135 return (DW_DLV_ERROR); 136 } 137 138 return (DW_DLV_OK); 139 } 140 141 int 142 dwarf_attrval_unsigned(Dwarf_Die die, Dwarf_Half attr, Dwarf_Unsigned *valp, Dwarf_Error *err) 143 { 144 Dwarf_Attribute at; 145 Dwarf_Die die1; 146 Dwarf_Unsigned val; 147 Dwarf_Debug dbg; 148 int first; 149 150 dbg = die != NULL ? die->die_dbg : NULL; 151 152 if (die == NULL || valp == NULL) { 153 DWARF_SET_ERROR(dbg, err, DW_DLE_ARGUMENT); 154 return (DW_DLV_ERROR); 155 } 156 157 *valp = 0; 158 159 die1 = NULL; 160 for (;;) { 161 if ((at = _dwarf_attr_find(die, attr)) != NULL || 162 attr != DW_AT_type) 163 break; 164 if ((at = _dwarf_attr_find(die, DW_AT_abstract_origin)) == 165 NULL && 166 (at = _dwarf_attr_find(die, DW_AT_specification)) == NULL) 167 break; 168 169 switch (at->at_form) { 170 case DW_FORM_ref1: 171 case DW_FORM_ref2: 172 case DW_FORM_ref4: 173 case DW_FORM_ref8: 174 case DW_FORM_ref_udata: 175 val = at->u[0].u64; 176 first = (die1 == NULL); 177 die1 = _dwarf_die_find(die, val); 178 if (!first) 179 dwarf_dealloc(dbg, die, DW_DLA_DIE); 180 if (die1 == NULL) { 181 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY); 182 return (DW_DLV_NO_ENTRY); 183 } 184 die = die1; 185 break; 186 default: 187 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD); 188 return (DW_DLV_ERROR); 189 } 190 } 191 192 if (at == NULL) { 193 DWARF_SET_ERROR(dbg, err, DW_DLE_NO_ENTRY); 194 return (DW_DLV_NO_ENTRY); 195 } 196 197 switch (at->at_form) { 198 case DW_FORM_addr: 199 case DW_FORM_data1: 200 case DW_FORM_data2: 201 case DW_FORM_data4: 202 case DW_FORM_data8: 203 case DW_FORM_udata: 204 case DW_FORM_ref1: 205 case DW_FORM_ref2: 206 case DW_FORM_ref4: 207 case DW_FORM_ref8: 208 case DW_FORM_ref_udata: 209 *valp = at->u[0].u64; 210 break; 211 default: 212 if (die1 != NULL) 213 dwarf_dealloc(dbg, die1, DW_DLA_DIE); 214 DWARF_SET_ERROR(dbg, err, DW_DLE_ATTR_FORM_BAD); 215 return (DW_DLV_ERROR); 216 } 217 218 if (die1 != NULL) 219 dwarf_dealloc(dbg, die1, DW_DLA_DIE); 220 221 return (DW_DLV_OK); 222 } 223