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 file manages access the image contained in various file |
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22 | * formats. |
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23 | * |
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24 | * The base element is a file. It references a object file that is either |
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25 | * inside an archive or stand alone. You access a object file by constructing a |
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26 | * handle. A handle is the object file with the specific file descriptor |
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27 | * created when the archive or object file was opened. |
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28 | * |
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29 | * |
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30 | */ |
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31 | |
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32 | #if !defined (_RLD_FILES_H_) |
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33 | #define _RLD_FILES_H_ |
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34 | |
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35 | #include <list> |
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36 | #include <map> |
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37 | #include <string> |
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38 | #include <vector> |
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39 | |
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40 | #include <rld.h> |
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41 | |
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42 | namespace rld |
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43 | { |
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44 | namespace files |
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45 | { |
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46 | /** |
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47 | * Container of file paths. |
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48 | */ |
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49 | typedef std::vector < std::string > paths; |
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50 | |
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51 | /** |
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52 | * Container of files. |
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53 | */ |
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54 | typedef std::vector < file > files; |
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55 | |
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56 | /** |
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57 | * Container of archive files. |
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58 | */ |
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59 | typedef std::map < std::string, archive* > archives; |
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60 | |
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61 | /** |
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62 | * Container of object files. |
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63 | */ |
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64 | typedef std::map < std::string, object* > objects; |
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65 | |
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66 | /** |
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67 | * Container list of object files. |
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68 | */ |
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69 | typedef std::list < object* > object_list; |
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70 | |
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71 | /** |
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72 | * Split a path from a string with a delimiter to the path container. Add |
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73 | * only the paths that exist and ignore those that do not. |
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74 | */ |
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75 | void path_split (const std::string& path, |
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76 | rld::files::paths& paths); |
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77 | |
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78 | /** |
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79 | * Make a path by joining the parts with required separator. |
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80 | */ |
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81 | void path_join (const std::string& path_, |
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82 | const std::string& file_, |
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83 | std::string& joined); |
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84 | |
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85 | /** |
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86 | * Check the path is a file. |
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87 | */ |
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88 | bool check_file (const std::string& path); |
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89 | |
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90 | /** |
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91 | * Check the path is a directory. |
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92 | */ |
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93 | bool check_directory (const std::string& path); |
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94 | |
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95 | /** |
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96 | * Find the file given a container of paths and file names. |
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97 | * |
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98 | * @param path The path of the file if found else empty. |
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99 | * @param name The name of the file to search for. |
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100 | * @param search_paths The container of paths to search. |
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101 | */ |
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102 | void find_file (std::string& path, |
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103 | const std::string& name, |
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104 | paths& search_paths); |
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105 | |
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106 | /** |
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107 | * A file is a single object file that is either in an archive or stand |
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108 | * alone. |
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109 | */ |
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110 | class file |
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111 | { |
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112 | public: |
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113 | /** |
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114 | * Construct the file from the component parts when part of an archive. |
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115 | * |
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116 | * @param aname The archive name. |
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117 | * @param oname The object file name. |
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118 | * @param offset The offset in the archive the object file starts. |
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119 | * @param size The size of the archive the object file starts. |
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120 | */ |
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121 | file (const std::string& aname, |
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122 | const std::string& oname, |
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123 | off_t offset, |
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124 | size_t size); |
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125 | |
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126 | /** |
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127 | * Construct the name by splitting the full path into an archive, |
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128 | * object file name and offset. |
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129 | * |
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130 | * @param path The path to the image. |
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131 | * @param is_object If true (default) the name is for an object file. |
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132 | */ |
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133 | file (const std::string& path, bool is_object = true); |
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134 | |
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135 | /** |
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136 | * Contruct an empty file. |
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137 | */ |
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138 | file (); |
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139 | |
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140 | /** |
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141 | * Set a name from the path. |
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142 | * |
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143 | * @param path The path to the image. |
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144 | * @param is_object If true (default) the name is for an object file. |
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145 | */ |
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146 | void set (const std::string& path, bool is_object = true); |
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147 | |
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148 | /** |
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149 | * Is an archive returns true if the file is in an archive. |
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150 | * |
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151 | * @retval true The object file is in an archive. |
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152 | * @retval false The object file is stand alone. |
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153 | */ |
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154 | bool is_archive () const; |
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155 | |
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156 | /** |
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157 | * Is object file stand alone. |
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158 | * |
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159 | * @retval true The object file is stand alone. |
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160 | * @retval false The object could be part of an archive. |
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161 | */ |
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162 | bool is_object () const; |
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163 | |
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164 | /** |
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165 | * Valid returns true if there is a valid name. |
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166 | * |
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167 | * @retval true There is a valid name. |
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168 | * @retval false There is not name assigned. |
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169 | */ |
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170 | bool is_valid () const; |
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171 | |
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172 | /** |
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173 | * Exists returns true if the archive or object file is present on disk |
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174 | * and a regular file. |
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175 | * |
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176 | * @retval true The file is valid and a regular file. |
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177 | * @retval false The file is either not present, not accessable or not a |
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178 | * regular file. |
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179 | */ |
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180 | bool exists () const; |
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181 | |
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182 | /** |
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183 | * The path maps to the real file on disk. The file may not be valid. |
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184 | * |
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185 | * @return const std::string The real path to the file on disk. |
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186 | */ |
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187 | const std::string path () const; |
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188 | |
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189 | /** |
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190 | * The full path. |
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191 | * |
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192 | * @return const std::string The full path to the image. |
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193 | */ |
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194 | const std::string full () const; |
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195 | |
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196 | /** |
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197 | * The base path. It is the basename of the full path. |
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198 | * |
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199 | * @return const std::string The basename of the full path to the image. |
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200 | */ |
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201 | const std::string basename () const; |
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202 | |
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203 | /** |
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204 | * The archive name component. A length of 0 means there was not |
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205 | * archive component. |
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206 | */ |
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207 | const std::string& aname () const; |
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208 | |
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209 | /** |
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210 | * The object name. There is always an object name. |
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211 | */ |
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212 | const std::string& oname () const; |
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213 | |
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214 | /** |
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215 | * The object's offset in the archive. |
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216 | */ |
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217 | off_t offset () const; |
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218 | |
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219 | /** |
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220 | * The object's size in the archive. |
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221 | */ |
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222 | size_t size () const; |
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223 | |
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224 | private: |
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225 | std::string aname_; //< The archive name. |
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226 | std::string oname_; //< The object name. |
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227 | off_t offset_; //< The object's offset in the archive. |
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228 | size_t size_; //< The object's size in teh archive. |
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229 | }; |
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230 | |
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231 | /** |
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232 | * Image is the base file type. A base class is used so we can have a |
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233 | * single container of to hold types of images we need to support. |
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234 | */ |
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235 | class image |
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236 | { |
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237 | public: |
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238 | /** |
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239 | * Construct the image. |
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240 | * |
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241 | * @param name The name of the image. |
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242 | */ |
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243 | image (file& name); |
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244 | |
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245 | /** |
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246 | * Construct the image. |
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247 | * |
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248 | * @param name The file path. |
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249 | * @param is_object If true (default) the name is for an object file. |
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250 | */ |
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251 | image (const std::string& path, bool is_object = true); |
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252 | |
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253 | /** |
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254 | * Construct the image. |
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255 | */ |
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256 | image (); |
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257 | |
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258 | /** |
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259 | * Destruct the image. |
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260 | */ |
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261 | virtual ~image (); |
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262 | |
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263 | /** |
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264 | * Open the image. You can open the image more than once but you need to |
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265 | * close it the same number of times. |
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266 | */ |
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267 | virtual void open (file& name); |
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268 | |
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269 | /** |
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270 | * Open the image. You can open the image more than once but you need to |
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271 | * close it the same number of times. |
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272 | */ |
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273 | virtual void open (bool writable = false); |
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274 | |
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275 | /** |
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276 | * Close the image. |
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277 | */ |
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278 | virtual void close (); |
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279 | |
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280 | /** |
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281 | * Read a block from the file. |
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282 | */ |
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283 | virtual ssize_t read (uint8_t* buffer, size_t size); |
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284 | |
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285 | /** |
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286 | * Write a block from the file. |
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287 | */ |
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288 | virtual ssize_t write (const void* buffer, size_t size); |
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289 | |
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290 | /** |
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291 | * Seek. |
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292 | */ |
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293 | virtual void seek (off_t offset); |
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294 | |
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295 | /** |
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296 | * Seek and read. |
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297 | */ |
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298 | virtual bool seek_read (off_t offset, uint8_t* buffer, size_t size); |
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299 | |
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300 | /** |
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301 | * Seek and write. |
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302 | */ |
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303 | virtual bool seek_write (off_t offset, const void* buffer, size_t size); |
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304 | |
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305 | /** |
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306 | * The name of the image. |
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307 | */ |
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308 | const file& name () const; |
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309 | |
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310 | /** |
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311 | * References to the image. |
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312 | */ |
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313 | virtual int references () const; |
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314 | |
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315 | /** |
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316 | * The file size. |
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317 | */ |
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318 | virtual size_t size () const; |
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319 | |
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320 | /** |
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321 | * The file descriptor. |
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322 | */ |
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323 | virtual int fd () const; |
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324 | |
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325 | /** |
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326 | * The libelf reference. The ELF image could be in an archive container |
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327 | * so set container to true to get the archive's reference. |
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328 | */ |
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329 | virtual rld::elf::elf* elf (bool archive = false); |
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330 | |
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331 | /** |
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332 | * Set the libelf reference. |
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333 | */ |
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334 | void set_elf (rld::elf::elf* elf); |
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335 | |
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336 | /** |
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337 | * A symbol in the image has been referenced. |
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338 | */ |
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339 | virtual void symbol_referenced (); |
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340 | |
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341 | /** |
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342 | * Return the number of symbol references. |
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343 | */ |
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344 | virtual int symbol_references () const; |
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345 | |
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346 | /** |
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347 | * The path maps to the real file on disk. The file may not be valid. |
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348 | * |
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349 | * @return const std::string The real path to the file on disk. |
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350 | */ |
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351 | const std::string path () const { |
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352 | return name ().path (); |
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353 | } |
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354 | |
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355 | /** |
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356 | * Is the archive open ? |
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357 | * |
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358 | * @retval true The archive is open. |
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359 | * @retval false The archive is not open. |
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360 | */ |
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361 | bool is_open () const { |
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362 | return fd () != -1; |
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363 | } |
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364 | |
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365 | private: |
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366 | file name_; //< The name of the file. |
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367 | int references_; //< The number of handles open. |
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368 | int fd_; //< The file descriptor of the archive. |
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369 | elf::elf* elf_; //< The libelf reference. |
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370 | int symbol_refs; //< The number of symbols references made. |
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371 | }; |
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372 | |
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373 | /** |
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374 | * Copy the input section of the image to the output section. The file |
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375 | * positions in the images must be set before making the call. |
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376 | */ |
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377 | void copy (image& in, image& out, size_t size); |
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378 | |
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379 | /** |
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380 | * The archive class proivdes access to ELF object files that are held in a |
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381 | * AR format file. GNU AR extensions are supported. |
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382 | */ |
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383 | class archive: |
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384 | public image |
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385 | { |
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386 | public: |
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387 | /** |
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388 | * Open a archive format file that contains ELF object files. |
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389 | * |
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390 | */ |
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391 | archive (const std::string& name); |
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392 | |
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393 | /** |
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394 | * Close the archive. |
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395 | */ |
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396 | virtual ~archive (); |
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397 | |
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398 | /** |
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399 | * Match the archive name. |
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400 | * |
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401 | * @param name The name of the archive to check. |
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402 | * @retval true This is the archive. |
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403 | * @retval false This is not the archive. |
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404 | */ |
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405 | bool is (const std::string& name) const; |
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406 | |
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407 | /** |
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408 | * Check this is a valid archive. |
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409 | */ |
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410 | bool is_valid (); |
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411 | |
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412 | /** |
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413 | * Load objects. |
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414 | */ |
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415 | void load_objects (objects& objs); |
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416 | |
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417 | /** |
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418 | * Get the name. |
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419 | */ |
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420 | const std::string& get_name () const; |
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421 | |
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422 | /** |
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423 | * Less than operator for the map container. |
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424 | */ |
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425 | bool operator< (const archive& rhs) const; |
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426 | |
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427 | /** |
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428 | * Create a new archive. If referening an existing archive it is |
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429 | * overwritten. |
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430 | */ |
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431 | void create (object_list& objects); |
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432 | |
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433 | private: |
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434 | /** |
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435 | * Read header. |
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436 | */ |
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437 | bool read_header (off_t offset, uint8_t* header); |
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438 | |
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439 | /** |
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440 | * Add the object file from the archive to the object's container. |
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441 | */ |
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442 | void add_object (objects& objs, |
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443 | const char* name, |
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444 | off_t offset, |
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445 | size_t size); |
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446 | |
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447 | /** |
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448 | * Write a file header into the archive. |
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449 | */ |
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450 | void write_header (const std::string& name, |
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451 | uint32_t mtime, |
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452 | int uid, |
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453 | int gid, |
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454 | int mode, |
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455 | size_t size); |
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456 | |
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457 | /** |
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458 | * Cannot copy via a copy constructor. |
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459 | */ |
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460 | archive (const archive& orig); |
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461 | |
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462 | /** |
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463 | * Cannot assign using the assignment operator.. |
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464 | */ |
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465 | archive& operator= (const archive& rhs); |
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466 | }; |
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467 | |
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468 | /** |
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469 | * The object file cab be in an archive or a file. |
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470 | */ |
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471 | class object: |
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472 | public image |
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473 | { |
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474 | public: |
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475 | /** |
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476 | * Construct an object image that is part of an archive. |
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477 | * |
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478 | * @param archive_ The archive the object file is part of. |
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479 | * @param file_ The image file. |
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480 | */ |
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481 | object (archive& archive_, file& file_); |
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482 | |
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483 | /** |
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484 | * Construct the object file. |
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485 | * |
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486 | * @param path The object file path. |
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487 | */ |
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488 | object (const std::string& path); |
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489 | |
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490 | /** |
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491 | * Construct the object file. |
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492 | */ |
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493 | object (); |
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494 | |
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495 | /** |
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496 | * Destruct the object file. |
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497 | */ |
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498 | virtual ~object (); |
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499 | |
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500 | /** |
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501 | * Open the object file. |
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502 | */ |
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503 | virtual void open (); |
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504 | |
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505 | /** |
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506 | * Close the object. |
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507 | */ |
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508 | virtual void close (); |
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509 | |
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510 | /** |
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511 | * Begin the ELF session. |
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512 | */ |
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513 | void begin (); |
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514 | |
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515 | /** |
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516 | * End the ELF session. |
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517 | */ |
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518 | void end (); |
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519 | |
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520 | /** |
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521 | * Load the symbols into the symbols table. |
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522 | * |
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523 | * @param symbols The symbol table to load. |
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524 | * @param local Include local symbols. The default is not to. |
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525 | */ |
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526 | void load_symbols (rld::symbols::table& symbols, bool local = false); |
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527 | |
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528 | /** |
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529 | * Get the string from the string table. |
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530 | */ |
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531 | std::string get_string (int section, size_t offset); |
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532 | |
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533 | /** |
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534 | * References to the image. |
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535 | */ |
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536 | virtual int references () const; |
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537 | |
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538 | /** |
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539 | * The file size. |
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540 | */ |
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541 | virtual size_t size () const; |
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542 | |
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543 | /** |
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544 | * The file descriptor. |
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545 | */ |
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546 | virtual int fd () const; |
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547 | |
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548 | /** |
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549 | * The libelf reference. The ELF image could be in an archive container |
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550 | * so set container to true to get the archive's reference. |
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551 | */ |
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552 | virtual elf::elf* elf (bool archive = false); |
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553 | |
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554 | /** |
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555 | * A symbol in the image has been referenced. |
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556 | */ |
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557 | virtual void symbol_referenced (); |
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558 | |
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559 | /** |
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560 | * The archive the object file is contained in. If 0 the object file is |
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561 | * not contained in an archive. |
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562 | */ |
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563 | archive* get_archive (); |
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564 | |
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565 | /** |
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566 | * Number of sections in the object file. |
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567 | */ |
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568 | int sections () const; |
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569 | |
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570 | /** |
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571 | * Section string index. |
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572 | */ |
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573 | int section_strings () const; |
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574 | |
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575 | /** |
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576 | * Return the unresolved symbol table for this object file. |
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577 | */ |
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578 | rld::symbols::table& unresolved_symbols (); |
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579 | |
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580 | /** |
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581 | * Return the list external symbols. |
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582 | */ |
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583 | rld::symbols::list& external_symbols (); |
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584 | |
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585 | private: |
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586 | archive* archive_; //< Points to the archive if part of an |
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587 | // archive. |
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588 | elf::elf_ehdr ehdr; //< The ELF header. |
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589 | rld::symbols::table unresolved; //< This object's unresolved symbols. |
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590 | rld::symbols::list externals; //< This object's external symbols. |
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591 | |
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592 | /** |
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593 | * Cannot copy via a copy constructor. |
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594 | */ |
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595 | object (const object& orig); |
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596 | |
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597 | /** |
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598 | * Cannot assign using the assignment operator. |
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599 | */ |
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600 | object& operator= (const object& rhs); |
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601 | }; |
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602 | |
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603 | /** |
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604 | * A collection of objects files as a cache. This currently is not a cache |
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605 | * but it could become one. |
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606 | */ |
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607 | class cache |
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608 | { |
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609 | public: |
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610 | /** |
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611 | * Construct the cache. |
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612 | */ |
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613 | cache (); |
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614 | |
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615 | /** |
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616 | * Destruct the objects. |
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617 | */ |
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618 | virtual ~cache (); |
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619 | |
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620 | /** |
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621 | * Open the cache by collecting the file names, loading object headers |
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622 | * and loading the archive file names. |
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623 | */ |
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624 | void open (); |
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625 | |
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626 | /** |
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627 | * Close the cache. |
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628 | */ |
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629 | void close (); |
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630 | |
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631 | /** |
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632 | * Add a file path to the cache. |
---|
633 | */ |
---|
634 | void add (const std::string& path); |
---|
635 | |
---|
636 | /** |
---|
637 | * Add a container of path to the cache. |
---|
638 | */ |
---|
639 | void add (paths& paths__); |
---|
640 | |
---|
641 | /** |
---|
642 | * Add a container of path to the cache. |
---|
643 | */ |
---|
644 | void add_libraries (paths& paths__); |
---|
645 | |
---|
646 | /** |
---|
647 | * Being an ELF session on an archive. |
---|
648 | */ |
---|
649 | void archive_begin (const std::string& path); |
---|
650 | |
---|
651 | /** |
---|
652 | * End an ELF session on an archive. |
---|
653 | */ |
---|
654 | void archive_end (const std::string& path); |
---|
655 | |
---|
656 | /** |
---|
657 | * Being ELF sessions on all archives. |
---|
658 | */ |
---|
659 | void archives_begin (); |
---|
660 | |
---|
661 | /** |
---|
662 | * End the archive elf sessions. |
---|
663 | */ |
---|
664 | void archives_end (); |
---|
665 | |
---|
666 | /** |
---|
667 | * Collect the object names and add them to the cache. |
---|
668 | */ |
---|
669 | void collect_object_files (); |
---|
670 | |
---|
671 | /** |
---|
672 | * Collect the object file names by verifing the paths to the files are |
---|
673 | * valid or read the object file names contained in any archives. |
---|
674 | */ |
---|
675 | void collect_object_files (const std::string& path); |
---|
676 | |
---|
677 | /** |
---|
678 | * Load the symbols into the symbol table. |
---|
679 | * |
---|
680 | * @param symbols The symbol table to load. |
---|
681 | * @param local Include local symbols. The default is not to. |
---|
682 | */ |
---|
683 | void load_symbols (rld::symbols::table& symbols, bool locals = false); |
---|
684 | |
---|
685 | /** |
---|
686 | * Output the unresolved symbol table to the output stream. |
---|
687 | */ |
---|
688 | void output_unresolved_symbols (std::ostream& out); |
---|
689 | |
---|
690 | /** |
---|
691 | * Get the archives. |
---|
692 | */ |
---|
693 | archives& get_archives (); |
---|
694 | |
---|
695 | /** |
---|
696 | * Get the objects inlcuding those in archives. |
---|
697 | */ |
---|
698 | objects& get_objects (); |
---|
699 | |
---|
700 | /** |
---|
701 | * Get the added objects. Does not include the ones in th archives. |
---|
702 | */ |
---|
703 | void get_objects (object_list& list); |
---|
704 | |
---|
705 | /** |
---|
706 | * Get the paths. |
---|
707 | */ |
---|
708 | const paths& get_paths () const; |
---|
709 | |
---|
710 | /** |
---|
711 | * Get the archive files. |
---|
712 | */ |
---|
713 | void get_archive_files (files& afiles); |
---|
714 | |
---|
715 | /** |
---|
716 | * Get the object files including those in archives. |
---|
717 | */ |
---|
718 | void get_object_files (files& ofiles); |
---|
719 | |
---|
720 | /** |
---|
721 | * Get the archive count. |
---|
722 | */ |
---|
723 | int archive_count () const; |
---|
724 | |
---|
725 | /** |
---|
726 | * Get the object count. |
---|
727 | */ |
---|
728 | int object_count () const; |
---|
729 | |
---|
730 | /** |
---|
731 | * Get the path count. |
---|
732 | */ |
---|
733 | int path_count () const; |
---|
734 | |
---|
735 | /** |
---|
736 | * Output archive files. |
---|
737 | */ |
---|
738 | void output_archive_files (std::ostream& out); |
---|
739 | |
---|
740 | /** |
---|
741 | * Output archive files. |
---|
742 | */ |
---|
743 | void output_object_files (std::ostream& out); |
---|
744 | |
---|
745 | protected: |
---|
746 | |
---|
747 | /** |
---|
748 | * Input a path into the cache. |
---|
749 | */ |
---|
750 | virtual void input (const std::string& path); |
---|
751 | |
---|
752 | private: |
---|
753 | paths paths_; //< The names of the files to process. |
---|
754 | archives archives_; //< The archive files. |
---|
755 | objects objects_; //< The object files. |
---|
756 | bool opened; //< The cache is open. |
---|
757 | }; |
---|
758 | |
---|
759 | /** |
---|
760 | * Find the libraries given the list of libraries as bare name which |
---|
761 | * have 'lib' and '.a' added. |
---|
762 | */ |
---|
763 | void find_libraries (paths& libraries, paths& libpaths, paths& libs); |
---|
764 | |
---|
765 | } |
---|
766 | } |
---|
767 | |
---|
768 | #endif |
---|