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1 /* |
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2 |
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3 Copyright (C) 2000,2002,2004 Silicon Graphics, Inc. All Rights Reserved. |
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4 Portions Copyright (C) 2007 David Anderson. All Rights Reserved. |
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5 |
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6 This program is free software; you can redistribute it and/or modify it |
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7 under the terms of version 2.1 of the GNU Lesser General Public License |
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8 as published by the Free Software Foundation. |
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9 |
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10 This program is distributed in the hope that it would be useful, but |
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11 WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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13 |
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14 Further, this software is distributed without any warranty that it is |
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15 free of the rightful claim of any third person regarding infringement |
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16 or the like. Any license provided herein, whether implied or |
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17 otherwise, applies only to this software file. Patent licenses, if |
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18 any, provided herein do not apply to combinations of this program with |
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19 other software, or any other product whatsoever. |
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20 |
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21 You should have received a copy of the GNU Lesser General Public |
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22 License along with this program; if not, write the Free Software |
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23 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301, |
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24 USA. |
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25 |
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26 Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane, |
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27 Mountain View, CA 94043, or: |
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28 |
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29 http://www.sgi.com |
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30 |
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31 For further information regarding this notice, see: |
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32 |
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33 http://oss.sgi.com/projects/GenInfo/NoticeExplan |
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34 |
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35 */ |
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36 /* The address of the Free Software Foundation is |
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37 Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
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38 Boston, MA 02110-1301, USA. |
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39 SGI has moved from the Crittenden Lane address. |
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40 */ |
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41 |
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42 |
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43 |
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44 |
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45 #include "config.h" |
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46 #include "dwarf_incl.h" |
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47 #include <stdio.h> |
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48 #include "dwarf_die_deliv.h" |
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49 |
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50 int |
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51 dwarf_get_address_size(Dwarf_Debug dbg, |
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52 Dwarf_Half * ret_addr_size, Dwarf_Error * error) |
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53 { |
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54 Dwarf_Half address_size; |
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55 |
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56 if (dbg == 0) { |
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57 _dwarf_error(NULL, error, DW_DLE_DBG_NULL); |
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58 return (DW_DLV_ERROR); |
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59 } |
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60 /* length size same as address size */ |
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61 address_size = dbg->de_pointer_size; |
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62 *ret_addr_size = address_size; |
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63 return DW_DLV_OK; |
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64 } |
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65 |
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66 int |
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67 dwarf_dieoffset(Dwarf_Die die, |
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68 Dwarf_Off * ret_offset, Dwarf_Error * error) |
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69 { |
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70 CHECK_DIE(die, DW_DLV_ERROR); |
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71 |
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72 *ret_offset = (die->di_debug_info_ptr - |
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73 die->di_cu_context->cc_dbg->de_debug_info); |
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74 return DW_DLV_OK; |
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75 } |
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76 |
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77 |
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78 /* |
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79 This function returns the offset of |
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80 the die relative to the start of its |
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81 compilation-unit rather than .debug_info. |
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82 Returns DW_DLV_ERROR on error. |
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83 */ |
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84 int |
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85 dwarf_die_CU_offset(Dwarf_Die die, |
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86 Dwarf_Off * cu_off, Dwarf_Error * error) |
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87 { |
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88 Dwarf_CU_Context cu_context; |
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89 |
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90 CHECK_DIE(die, DW_DLV_ERROR); |
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91 cu_context = die->di_cu_context; |
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92 |
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93 *cu_off = |
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94 (die->di_debug_info_ptr - cu_context->cc_dbg->de_debug_info - |
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95 cu_context->cc_debug_info_offset); |
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96 return DW_DLV_OK; |
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97 } |
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98 |
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99 |
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100 int |
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101 dwarf_tag(Dwarf_Die die, Dwarf_Half * tag, Dwarf_Error * error) |
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102 { |
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103 CHECK_DIE(die, DW_DLV_ERROR); |
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104 |
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105 |
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106 *tag = (die->di_abbrev_list->ab_tag); |
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107 return DW_DLV_OK; |
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108 } |
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109 |
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110 |
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111 int |
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112 dwarf_attrlist(Dwarf_Die die, |
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113 Dwarf_Attribute ** attrbuf, |
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114 Dwarf_Signed * attrcnt, Dwarf_Error * error) |
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115 { |
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116 Dwarf_Word attr_count = 0; |
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117 Dwarf_Word i = 0; |
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118 Dwarf_Half attr = 0; |
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119 Dwarf_Half attr_form = 0; |
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120 Dwarf_Byte_Ptr abbrev_ptr = 0; |
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121 Dwarf_Abbrev_List abbrev_list = 0; |
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122 Dwarf_Attribute new_attr = 0; |
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123 Dwarf_Attribute head_attr = NULL; |
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124 Dwarf_Attribute curr_attr = NULL; |
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125 Dwarf_Attribute *attr_ptr = 0; |
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126 Dwarf_Debug dbg = 0; |
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127 Dwarf_Byte_Ptr info_ptr = 0; |
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128 |
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129 CHECK_DIE(die, DW_DLV_ERROR); |
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130 dbg = die->di_cu_context->cc_dbg; |
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131 |
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132 abbrev_list = _dwarf_get_abbrev_for_code(die->di_cu_context, |
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133 die->di_abbrev_list-> |
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134 ab_code); |
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135 if (abbrev_list == NULL) { |
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136 _dwarf_error(dbg, error, DW_DLE_DIE_ABBREV_BAD); |
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137 return (DW_DLV_ERROR); |
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138 } |
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139 abbrev_ptr = abbrev_list->ab_abbrev_ptr; |
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140 |
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141 info_ptr = die->di_debug_info_ptr; |
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142 SKIP_LEB128_WORD(info_ptr); |
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143 |
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144 do { |
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145 Dwarf_Unsigned utmp2; |
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146 |
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147 DECODE_LEB128_UWORD(abbrev_ptr, utmp2); |
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148 attr = (Dwarf_Half) utmp2; |
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149 DECODE_LEB128_UWORD(abbrev_ptr, utmp2); |
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150 attr_form = (Dwarf_Half) utmp2; |
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151 |
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152 if (attr != 0) { |
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153 new_attr = |
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154 (Dwarf_Attribute) _dwarf_get_alloc(dbg, DW_DLA_ATTR, 1); |
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155 if (new_attr == NULL) { |
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156 _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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157 return (DW_DLV_ERROR); |
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158 } |
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159 |
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160 new_attr->ar_attribute = attr; |
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161 new_attr->ar_attribute_form_direct = attr_form; |
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162 new_attr->ar_attribute_form = attr_form; |
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163 if (attr_form == DW_FORM_indirect) { |
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164 Dwarf_Unsigned utmp6; |
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165 |
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166 /* DECODE_LEB128_UWORD does info_ptr update */ |
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167 DECODE_LEB128_UWORD(info_ptr, utmp6); |
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168 attr_form = (Dwarf_Half) utmp6; |
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169 new_attr->ar_attribute_form = attr_form; |
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170 } |
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171 new_attr->ar_cu_context = die->di_cu_context; |
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172 new_attr->ar_debug_info_ptr = info_ptr; |
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173 |
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174 info_ptr += _dwarf_get_size_of_val(dbg, attr_form, info_ptr, |
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175 die->di_cu_context-> |
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176 cc_length_size); |
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177 |
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178 if (head_attr == NULL) |
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179 head_attr = curr_attr = new_attr; |
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180 else { |
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181 curr_attr->ar_next = new_attr; |
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182 curr_attr = new_attr; |
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183 } |
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184 attr_count++; |
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185 } |
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186 } while (attr != 0 || attr_form != 0); |
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187 |
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188 if (attr_count == 0) { |
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189 *attrbuf = NULL; |
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190 *attrcnt = 0; |
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191 return (DW_DLV_NO_ENTRY); |
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192 } |
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193 |
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194 attr_ptr = (Dwarf_Attribute *) |
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195 _dwarf_get_alloc(dbg, DW_DLA_LIST, attr_count); |
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196 if (attr_ptr == NULL) { |
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197 _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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198 return (DW_DLV_ERROR); |
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199 } |
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200 |
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201 curr_attr = head_attr; |
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202 for (i = 0; i < attr_count; i++) { |
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203 *(attr_ptr + i) = curr_attr; |
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204 curr_attr = curr_attr->ar_next; |
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205 } |
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206 |
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207 *attrbuf = attr_ptr; |
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208 *attrcnt = attr_count; |
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209 return (DW_DLV_OK); |
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210 } |
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211 |
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212 |
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213 /* |
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214 This function takes a die, and an attr, and returns |
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215 a pointer to the start of the value of that attr in |
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216 the given die in the .debug_info section. The form |
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217 is returned in *attr_form. |
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218 |
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219 Returns NULL on error, or if attr is not found. |
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220 However, *attr_form is 0 on error, and positive |
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221 otherwise. |
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222 */ |
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223 static Dwarf_Byte_Ptr |
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224 _dwarf_get_value_ptr(Dwarf_Die die, |
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225 Dwarf_Half attr, Dwarf_Half * attr_form) |
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226 { |
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227 Dwarf_Byte_Ptr abbrev_ptr; |
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228 Dwarf_Abbrev_List abbrev_list; |
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229 Dwarf_Half curr_attr; |
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230 Dwarf_Half curr_attr_form; |
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231 Dwarf_Byte_Ptr info_ptr; |
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232 |
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233 abbrev_list = _dwarf_get_abbrev_for_code(die->di_cu_context, |
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234 die->di_abbrev_list-> |
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235 ab_code); |
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236 if (abbrev_list == NULL) { |
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237 *attr_form = 0; |
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238 return (NULL); |
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239 } |
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240 abbrev_ptr = abbrev_list->ab_abbrev_ptr; |
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241 |
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242 info_ptr = die->di_debug_info_ptr; |
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243 SKIP_LEB128_WORD(info_ptr); |
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244 |
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245 do { |
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246 Dwarf_Unsigned utmp3; |
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247 |
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248 DECODE_LEB128_UWORD(abbrev_ptr, utmp3); |
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249 curr_attr = (Dwarf_Half) utmp3; |
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250 DECODE_LEB128_UWORD(abbrev_ptr, utmp3); |
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251 curr_attr_form = (Dwarf_Half) utmp3; |
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252 if (curr_attr_form == DW_FORM_indirect) { |
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253 Dwarf_Unsigned utmp6; |
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254 |
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255 /* DECODE_LEB128_UWORD updates info_ptr */ |
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256 DECODE_LEB128_UWORD(info_ptr, utmp6); |
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257 curr_attr_form = (Dwarf_Half) utmp6; |
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258 } |
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259 |
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260 if (curr_attr == attr) { |
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261 *attr_form = curr_attr_form; |
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262 return (info_ptr); |
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263 } |
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264 |
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265 info_ptr += _dwarf_get_size_of_val(die->di_cu_context->cc_dbg, |
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266 curr_attr_form, info_ptr, |
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267 die->di_cu_context-> |
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268 cc_length_size); |
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269 } while (curr_attr != 0 || curr_attr_form != 0); |
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270 |
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271 *attr_form = 1; |
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272 return (NULL); |
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273 } |
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274 |
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275 |
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276 int |
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277 dwarf_diename(Dwarf_Die die, char **ret_name, Dwarf_Error * error) |
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278 { |
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279 Dwarf_Half attr_form; |
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280 Dwarf_Debug dbg; |
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281 Dwarf_Byte_Ptr info_ptr; |
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282 Dwarf_Unsigned string_offset; |
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283 int res; |
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284 |
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285 CHECK_DIE(die, DW_DLV_ERROR); |
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286 |
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287 info_ptr = _dwarf_get_value_ptr(die, DW_AT_name, &attr_form); |
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288 if (info_ptr == NULL) { |
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289 if (attr_form == 0) { |
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290 _dwarf_error(die->di_cu_context->cc_dbg, error, |
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291 DW_DLE_DIE_BAD); |
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292 return (DW_DLV_ERROR); |
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293 } |
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294 return DW_DLV_NO_ENTRY; |
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295 } |
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296 |
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297 if (attr_form == DW_FORM_string) { |
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298 *ret_name = (char *) (info_ptr); |
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299 return DW_DLV_OK; |
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300 } |
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301 |
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302 dbg = die->di_cu_context->cc_dbg; |
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303 if (attr_form != DW_FORM_strp) { |
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304 _dwarf_error(dbg, error, DW_DLE_ATTR_FORM_BAD); |
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305 return (DW_DLV_ERROR); |
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306 } |
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307 |
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308 READ_UNALIGNED(dbg, string_offset, Dwarf_Unsigned, |
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309 info_ptr, die->di_cu_context->cc_length_size); |
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310 |
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311 if (string_offset >= dbg->de_debug_str_size) { |
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312 _dwarf_error(dbg, error, DW_DLE_STRING_OFFSET_BAD); |
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313 return (DW_DLV_ERROR); |
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314 } |
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315 |
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316 res = |
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317 _dwarf_load_section(dbg, |
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318 dbg->de_debug_str_index, |
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319 &dbg->de_debug_str, error); |
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320 if (res != DW_DLV_OK) { |
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321 return res; |
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322 } |
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323 |
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324 *ret_name = (char *) (dbg->de_debug_str + string_offset); |
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325 return DW_DLV_OK; |
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326 } |
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327 |
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328 |
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329 int |
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330 dwarf_hasattr(Dwarf_Die die, |
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331 Dwarf_Half attr, |
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332 Dwarf_Bool * return_bool, Dwarf_Error * error) |
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333 { |
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334 Dwarf_Half attr_form; |
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335 |
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336 CHECK_DIE(die, DW_DLV_ERROR); |
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337 |
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338 if (_dwarf_get_value_ptr(die, attr, &attr_form) == NULL) { |
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339 if (attr_form == 0) { |
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340 _dwarf_error(die->di_cu_context->cc_dbg, error, |
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341 DW_DLE_DIE_BAD); |
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342 return (DW_DLV_ERROR); |
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343 } |
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344 *return_bool = false; |
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345 return DW_DLV_OK; |
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346 } |
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347 |
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348 *return_bool = (true); |
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349 return DW_DLV_OK; |
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350 } |
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351 |
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352 |
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353 int |
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354 dwarf_attr(Dwarf_Die die, |
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355 Dwarf_Half attr, |
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356 Dwarf_Attribute * ret_attr, Dwarf_Error * error) |
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357 { |
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358 Dwarf_Half attr_form; |
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359 Dwarf_Attribute attrib; |
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360 Dwarf_Byte_Ptr info_ptr; |
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361 Dwarf_Debug dbg; |
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362 |
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363 CHECK_DIE(die, DW_DLV_ERROR); |
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364 dbg = die->di_cu_context->cc_dbg; |
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365 |
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366 info_ptr = _dwarf_get_value_ptr(die, attr, &attr_form); |
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367 if (info_ptr == NULL) { |
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368 if (attr_form == 0) { |
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369 _dwarf_error(dbg, error, DW_DLE_DIE_BAD); |
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370 return (DW_DLV_ERROR); |
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371 } |
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372 return DW_DLV_NO_ENTRY; |
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373 } |
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374 |
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375 attrib = (Dwarf_Attribute) _dwarf_get_alloc(dbg, DW_DLA_ATTR, 1); |
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376 if (attrib == NULL) { |
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377 _dwarf_error(dbg, error, DW_DLE_ALLOC_FAIL); |
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378 return (DW_DLV_ERROR); |
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379 } |
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380 |
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381 attrib->ar_attribute = attr; |
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382 attrib->ar_attribute_form = attr_form; |
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383 attrib->ar_attribute_form_direct = attr_form; |
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384 attrib->ar_cu_context = die->di_cu_context; |
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385 attrib->ar_debug_info_ptr = info_ptr; |
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386 *ret_attr = (attrib); |
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387 return DW_DLV_OK; |
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388 } |
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389 |
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390 |
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391 int |
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392 dwarf_lowpc(Dwarf_Die die, |
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393 Dwarf_Addr * return_addr, Dwarf_Error * error) |
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394 { |
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395 Dwarf_Addr ret_addr = 0; |
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396 Dwarf_Byte_Ptr info_ptr = 0; |
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397 Dwarf_Half attr_form = 0; |
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398 Dwarf_Debug dbg = 0; |
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399 |
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400 CHECK_DIE(die, DW_DLV_ERROR); |
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401 |
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402 dbg = die->di_cu_context->cc_dbg; |
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403 info_ptr = _dwarf_get_value_ptr(die, DW_AT_low_pc, &attr_form); |
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404 if ((info_ptr == NULL && attr_form == 0) || |
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405 (info_ptr != NULL && attr_form != DW_FORM_addr)) { |
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406 _dwarf_error(dbg, error, DW_DLE_DIE_BAD); |
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407 return (DW_DLV_ERROR); |
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408 } |
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409 if (info_ptr == NULL) { |
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410 return (DW_DLV_NO_ENTRY); |
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411 } |
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412 |
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413 |
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414 READ_UNALIGNED(dbg, ret_addr, Dwarf_Addr, |
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415 info_ptr, dbg->de_pointer_size); |
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416 |
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417 *return_addr = ret_addr; |
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418 return (DW_DLV_OK); |
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419 } |
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420 |
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421 |
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422 int |
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423 dwarf_highpc(Dwarf_Die die, |
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424 Dwarf_Addr * return_addr, Dwarf_Error * error) |
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425 { |
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426 Dwarf_Addr ret_addr; |
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427 Dwarf_Byte_Ptr info_ptr; |
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428 Dwarf_Half attr_form; |
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429 Dwarf_Debug dbg; |
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430 |
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431 CHECK_DIE(die, DW_DLV_ERROR); |
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432 |
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433 dbg = die->di_cu_context->cc_dbg; |
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434 info_ptr = _dwarf_get_value_ptr(die, DW_AT_high_pc, &attr_form); |
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435 if ((info_ptr == NULL && attr_form == 0) || |
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436 (info_ptr != NULL && attr_form != DW_FORM_addr)) { |
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437 _dwarf_error(dbg, error, DW_DLE_DIE_BAD); |
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438 return (DW_DLV_ERROR); |
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439 } |
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440 if (info_ptr == NULL) { |
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441 return (DW_DLV_NO_ENTRY); |
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442 } |
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443 |
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444 READ_UNALIGNED(dbg, ret_addr, Dwarf_Addr, |
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445 info_ptr, dbg->de_pointer_size); |
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446 |
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447 *return_addr = ret_addr; |
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448 return (DW_DLV_OK); |
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449 } |
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450 |
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451 |
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452 /* |
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453 Takes a die, an attribute attr, and checks if attr |
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454 occurs in die. Attr is required to be an attribute |
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455 whose form is in the "constant" class. If attr occurs |
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456 in die, the value is returned. |
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457 Returns DW_DLV_OK, DW_DLV_ERROR, or DW_DLV_NO_ENTRY as |
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458 appropriate. Sets the value thru the pointer return_val. |
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459 This function is meant to do all the |
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460 processing for dwarf_bytesize, dwarf_bitsize, dwarf_bitoffset, |
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461 and dwarf_srclang. |
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462 */ |
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463 static int |
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464 _dwarf_die_attr_unsigned_constant(Dwarf_Die die, |
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465 Dwarf_Half attr, |
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466 Dwarf_Unsigned * return_val, |
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467 Dwarf_Error * error) |
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468 { |
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469 Dwarf_Byte_Ptr info_ptr; |
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470 Dwarf_Half attr_form; |
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471 Dwarf_Unsigned ret_value; |
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472 Dwarf_Debug dbg; |
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473 |
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474 CHECK_DIE(die, DW_DLV_ERROR); |
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475 |
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476 dbg = die->di_cu_context->cc_dbg; |
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477 info_ptr = _dwarf_get_value_ptr(die, attr, &attr_form); |
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478 if (info_ptr != NULL) { |
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479 switch (attr_form) { |
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480 |
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481 case DW_FORM_data1: |
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482 *return_val = (*(Dwarf_Small *) info_ptr); |
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483 return (DW_DLV_OK); |
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484 |
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485 case DW_FORM_data2: |
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486 READ_UNALIGNED(dbg, ret_value, Dwarf_Unsigned, |
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487 info_ptr, sizeof(Dwarf_Shalf)); |
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488 *return_val = ret_value; |
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489 return (DW_DLV_OK); |
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490 |
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491 case DW_FORM_data4: |
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492 READ_UNALIGNED(dbg, ret_value, Dwarf_Unsigned, |
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493 info_ptr, sizeof(Dwarf_sfixed)); |
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494 *return_val = ret_value; |
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495 return (DW_DLV_OK); |
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496 |
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497 case DW_FORM_data8: |
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498 READ_UNALIGNED(dbg, ret_value, Dwarf_Unsigned, |
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499 info_ptr, sizeof(Dwarf_Unsigned)); |
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500 *return_val = ret_value; |
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501 return (DW_DLV_OK); |
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502 |
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503 case DW_FORM_udata: |
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504 *return_val = (_dwarf_decode_u_leb128(info_ptr, NULL)); |
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505 return (DW_DLV_OK); |
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506 |
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507 default: |
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508 _dwarf_error(dbg, error, DW_DLE_DIE_BAD); |
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509 return (DW_DLV_ERROR); |
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510 } |
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511 } |
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512 if (attr_form == 0) { |
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513 _dwarf_error(dbg, error, DW_DLE_DIE_BAD); |
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514 return (DW_DLV_ERROR); |
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515 } |
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516 return DW_DLV_NO_ENTRY; |
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517 } |
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518 |
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519 |
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520 int |
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521 dwarf_bytesize(Dwarf_Die die, |
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522 Dwarf_Unsigned * ret_size, Dwarf_Error * error) |
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523 { |
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524 Dwarf_Unsigned luns; |
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525 int res = |
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526 _dwarf_die_attr_unsigned_constant(die, DW_AT_byte_size, &luns, |
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527 error); |
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528 |
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529 *ret_size = luns; |
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530 return res; |
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531 } |
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532 |
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533 |
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534 int |
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535 dwarf_bitsize(Dwarf_Die die, |
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536 Dwarf_Unsigned * ret_size, Dwarf_Error * error) |
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537 { |
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538 Dwarf_Unsigned luns; |
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539 int res; |
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540 |
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541 res = |
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542 _dwarf_die_attr_unsigned_constant(die, DW_AT_bit_size, &luns, |
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543 error); |
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544 *ret_size = luns; |
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545 return res; |
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546 } |
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547 |
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548 |
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549 int |
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550 dwarf_bitoffset(Dwarf_Die die, |
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551 Dwarf_Unsigned * ret_size, Dwarf_Error * error) |
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552 { |
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553 Dwarf_Unsigned luns; |
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554 int res; |
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555 |
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556 res = |
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557 _dwarf_die_attr_unsigned_constant(die, DW_AT_bit_offset, &luns, |
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558 error); |
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559 *ret_size = luns; |
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560 return res; |
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561 } |
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562 |
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563 |
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564 /* Refer section 3.1, page 21 in Dwarf Definition. */ |
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565 int |
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566 dwarf_srclang(Dwarf_Die die, |
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567 Dwarf_Unsigned * ret_size, Dwarf_Error * error) |
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568 { |
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569 Dwarf_Unsigned luns; |
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570 int res; |
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571 |
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572 res = |
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573 _dwarf_die_attr_unsigned_constant(die, DW_AT_language, &luns, |
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574 error); |
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575 *ret_size = luns; |
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576 return res; |
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577 } |
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578 |
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579 |
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580 /* Refer section 5.4, page 37 in Dwarf Definition. */ |
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581 int |
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582 dwarf_arrayorder(Dwarf_Die die, |
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583 Dwarf_Unsigned * ret_size, Dwarf_Error * error) |
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584 { |
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585 Dwarf_Unsigned luns; |
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586 int res; |
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587 |
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588 res = |
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589 _dwarf_die_attr_unsigned_constant(die, DW_AT_ordering, &luns, |
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590 error); |
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591 *ret_size = luns; |
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592 return res; |
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593 } |
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594 |
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595 /* |
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596 Return DW_DLV_OK if ok |
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597 DW_DLV_ERROR if failure. |
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598 |
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599 If the die and the attr are not related the result is |
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600 meaningless. |
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601 */ |
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602 int |
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603 dwarf_attr_offset(Dwarf_Die die, Dwarf_Attribute attr, Dwarf_Off * offset, /* return |
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604 offset |
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605 thru |
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606 this |
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607 ptr |
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608 */ |
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609 Dwarf_Error * error) |
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610 { |
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611 Dwarf_Off attroff; |
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612 |
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613 CHECK_DIE(die, DW_DLV_ERROR); |
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614 |
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615 attroff = (attr->ar_debug_info_ptr - |
|
616 die->di_cu_context->cc_dbg->de_debug_info); |
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617 *offset = attroff; |
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618 return DW_DLV_OK; |
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619 } |