1 | /* |
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2 | * Copyright (c) 2011, Chris Johns <chrisj@rtems.org> |
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3 | * |
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4 | * Permission to use, copy, modify, and/or distribute this software for any |
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5 | * purpose with or without fee is hereby granted, provided that the above |
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6 | * copyright notice and this permission notice appear in all copies. |
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7 | * |
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8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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15 | */ |
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16 | /** |
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17 | * @file |
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18 | * |
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19 | * @ingroup rtems-ld |
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20 | * |
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21 | * @brief RTEMS Linker symbols manages the symbols from all the object files. |
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22 | * |
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23 | */ |
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24 | |
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25 | #if !defined (_RLD_SYMBOLS_H_) |
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26 | #define _RLD_SYMBOLS_H_ |
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27 | |
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28 | #include <iostream> |
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29 | #include <list> |
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30 | #include <map> |
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31 | #include <string> |
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32 | |
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33 | #include <rld-elf-types.h> |
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34 | |
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35 | namespace rld |
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36 | { |
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37 | /** |
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38 | * Forward declarations. |
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39 | */ |
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40 | namespace files |
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41 | { |
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42 | class object; |
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43 | } |
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44 | |
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45 | namespace symbols |
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46 | { |
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47 | /** |
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48 | * A symbol. |
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49 | */ |
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50 | class symbol |
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51 | { |
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52 | public: |
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53 | /** |
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54 | * Default constructor. No symbol has been defined. |
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55 | */ |
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56 | symbol (); |
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57 | |
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58 | /** |
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59 | * Construct an exported symbol with a object file. |
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60 | */ |
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61 | symbol (int index, |
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62 | const std::string& name, |
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63 | files::object& object, |
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64 | const elf::elf_sym& esym); |
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65 | |
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66 | /** |
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67 | * Construct a symbol with no object file and an ELF index. |
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68 | */ |
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69 | symbol (int index, const std::string& name, const elf::elf_sym& esym); |
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70 | |
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71 | /** |
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72 | * Construct a linker symbol that is internally created. |
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73 | */ |
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74 | symbol (const std::string& name, |
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75 | const elf::elf_addr value = 0); |
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76 | |
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77 | /** |
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78 | * Construct a linker symbol that is internally created. |
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79 | */ |
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80 | symbol (const char* name, |
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81 | elf::elf_addr value = 0); |
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82 | |
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83 | /** |
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84 | * The symbol's index in the symtab section of the ELF file. |
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85 | */ |
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86 | int index () const; |
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87 | |
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88 | /** |
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89 | * The symbol's name. |
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90 | */ |
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91 | const std::string& name () const; |
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92 | |
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93 | /** |
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94 | * The symbol's demangled name. |
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95 | */ |
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96 | const std::string& demangled () const; |
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97 | |
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98 | /** |
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99 | * Is the symbol a C++ name ? |
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100 | */ |
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101 | bool is_cplusplus () const; |
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102 | |
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103 | /** |
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104 | * The symbol's type. |
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105 | */ |
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106 | int type () const; |
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107 | |
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108 | /** |
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109 | * The symbol's binding, ie local, weak, or global. |
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110 | */ |
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111 | int binding () const; |
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112 | |
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113 | /** |
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114 | * The symbol's section index. |
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115 | */ |
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116 | int section_index () const; |
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117 | |
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118 | /** |
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119 | * The value of the symbol. |
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120 | */ |
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121 | elf::elf_addr value () const; |
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122 | |
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123 | /** |
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124 | * The data of the symbol. |
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125 | */ |
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126 | uint32_t info () const; |
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127 | |
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128 | /** |
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129 | * The symbol's object file name. |
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130 | */ |
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131 | files::object* object () const; |
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132 | |
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133 | /** |
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134 | * Set the symbol's object file name. Used when resolving unresolved |
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135 | * symbols. |
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136 | */ |
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137 | void set_object (files::object& obj); |
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138 | |
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139 | /** |
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140 | * The ELF symbol. |
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141 | */ |
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142 | const elf::elf_sym& esym () const; |
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143 | |
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144 | /** |
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145 | * Return the number of references. |
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146 | */ |
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147 | int references () const { |
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148 | return references_; |
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149 | } |
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150 | |
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151 | /** |
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152 | * Return the number of references. |
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153 | */ |
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154 | void referenced (); |
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155 | |
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156 | /** |
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157 | * Less than operator for the map container. |
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158 | */ |
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159 | bool operator< (const symbol& rhs) const; |
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160 | |
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161 | /** |
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162 | * Output to the a stream. |
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163 | */ |
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164 | void output (std::ostream& out) const; |
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165 | |
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166 | private: |
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167 | |
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168 | int index_; //< The symbol's index in the ELF file. |
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169 | std::string name_; //< The name of the symbol. |
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170 | std::string demangled_; //< If a C++ symbol the demangled name. |
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171 | files::object* object_; //< The object file containing the symbol. |
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172 | elf::elf_sym esym_; //< The ELF symbol. |
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173 | int references_; //< The number of times if it referenced. |
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174 | }; |
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175 | |
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176 | /** |
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177 | * Container of symbols. A bucket of symbols. |
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178 | */ |
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179 | typedef std::list < symbol > bucket; |
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180 | |
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181 | /** |
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182 | * References to symbols. Should always point to symbols held in a bucket. |
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183 | */ |
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184 | typedef std::list < symbol* > pointers; |
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185 | |
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186 | /** |
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187 | * A symbols table is a map container of symbols. Should always point to |
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188 | * symbols held in a bucket. |
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189 | */ |
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190 | typedef std::map < std::string, symbol* > symtab; |
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191 | |
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192 | /** |
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193 | * A symbols contains a symbol table of externals and weak symbols. |
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194 | */ |
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195 | class table |
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196 | { |
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197 | public: |
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198 | /** |
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199 | * Construct a table. |
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200 | */ |
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201 | table (); |
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202 | |
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203 | /** |
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204 | * Destruct a table. |
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205 | */ |
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206 | ~table (); |
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207 | |
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208 | /** |
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209 | * Add an external symbol. |
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210 | */ |
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211 | void add_external (symbol& sym); |
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212 | |
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213 | /** |
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214 | * Add a weak symbol. |
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215 | */ |
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216 | void add_weak (symbol& sym); |
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217 | |
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218 | /** |
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219 | * Find an external symbol. |
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220 | */ |
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221 | symbol* find_external (const std::string& name); |
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222 | |
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223 | /** |
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224 | * Find an weak symbol. |
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225 | */ |
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226 | symbol* find_weak (const std::string& name); |
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227 | |
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228 | /** |
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229 | * Return the size of the symbols loaded. |
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230 | */ |
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231 | size_t size () const; |
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232 | |
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233 | /** |
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234 | * Return the externals symbol table. |
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235 | */ |
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236 | const symtab& externals () const; |
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237 | |
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238 | /** |
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239 | * Return the weaks symbol table. |
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240 | */ |
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241 | const symtab& weaks () const; |
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242 | |
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243 | private: |
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244 | |
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245 | /** |
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246 | * Cannot copy a table. |
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247 | */ |
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248 | table (const table& orig); |
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249 | |
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250 | /** |
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251 | * A table of external symbols. |
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252 | */ |
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253 | symtab _externals; |
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254 | |
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255 | /** |
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256 | * A table of weak symbols. |
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257 | */ |
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258 | symtab _weaks; |
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259 | }; |
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260 | |
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261 | /** |
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262 | * Load a table from a buckey. |
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263 | */ |
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264 | void load (bucket& bucket_, table& table_); |
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265 | |
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266 | /** |
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267 | * Load a table from a buckey. |
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268 | */ |
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269 | void load (bucket& bucket_, symtab& table_); |
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270 | |
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271 | /** |
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272 | * Given a container of symbols return how many are referenced. |
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273 | */ |
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274 | size_t referenced (pointers& symbols); |
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275 | |
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276 | /** |
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277 | * Output the symbol table. |
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278 | */ |
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279 | void output (std::ostream& out, const table& symbols); |
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280 | |
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281 | /** |
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282 | * Output the symbol table. |
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283 | */ |
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284 | void output (std::ostream& out, const symtab& symbols); |
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285 | } |
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286 | } |
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287 | |
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288 | /** |
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289 | * Output stream operator. |
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290 | */ |
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291 | static inline std::ostream& operator<< (std::ostream& out, |
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292 | const rld::symbols::symbol& sym) { |
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293 | sym.output (out); |
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294 | return out; |
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295 | } |
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296 | |
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297 | #endif |
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