Mercurial > hg > CbC > CbC_gcc
annotate include/plugin-api.h @ 136:4627f235cf2a
fix c-next example
author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
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date | Thu, 08 Nov 2018 14:11:56 +0900 |
parents | 84e7813d76e9 |
children | 1830386684a0 |
rev | line source |
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1 /* plugin-api.h -- External linker plugin API. */ |
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2 |
131 | 3 /* Copyright (C) 2009-2018 Free Software Foundation, Inc. |
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4 Written by Cary Coutant <ccoutant@google.com>. |
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5 |
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6 This file is part of binutils. |
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7 |
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8 This program is free software; you can redistribute it and/or modify |
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9 it under the terms of the GNU General Public License as published by |
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10 the Free Software Foundation; either version 3 of the License, or |
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11 (at your option) any later version. |
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12 |
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13 This program is distributed in the hope that it will be useful, |
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14 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 GNU General Public License for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with this program; if not, write to the Free Software |
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20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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21 MA 02110-1301, USA. */ |
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22 |
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23 /* This file defines the interface for writing a linker plugin, which is |
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24 described at < http://gcc.gnu.org/wiki/whopr/driver >. */ |
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25 |
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26 #ifndef PLUGIN_API_H |
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27 #define PLUGIN_API_H |
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28 |
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29 #ifdef HAVE_STDINT_H |
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30 #include <stdint.h> |
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31 #elif defined(HAVE_INTTYPES_H) |
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32 #include <inttypes.h> |
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33 #endif |
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34 #include <sys/types.h> |
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35 #if !defined(HAVE_STDINT_H) && !defined(HAVE_INTTYPES_H) && \ |
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36 !defined(UINT64_MAX) && !defined(uint64_t) |
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37 #error can not find uint64_t type |
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38 #endif |
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39 |
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40 #ifdef __cplusplus |
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41 extern "C" |
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42 { |
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43 #endif |
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44 |
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45 /* Status code returned by most API routines. */ |
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46 |
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47 enum ld_plugin_status |
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48 { |
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49 LDPS_OK = 0, |
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50 LDPS_NO_SYMS, /* Attempt to get symbols that haven't been added. */ |
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51 LDPS_BAD_HANDLE, /* No claimed object associated with given handle. */ |
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52 LDPS_ERR |
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53 /* Additional Error codes TBD. */ |
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54 }; |
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55 |
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56 /* The version of the API specification. */ |
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57 |
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58 enum ld_plugin_api_version |
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59 { |
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60 LD_PLUGIN_API_VERSION = 1 |
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61 }; |
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62 |
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63 /* The type of output file being generated by the linker. */ |
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64 |
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65 enum ld_plugin_output_file_type |
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66 { |
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67 LDPO_REL, |
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68 LDPO_EXEC, |
111 | 69 LDPO_DYN, |
70 LDPO_PIE | |
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71 }; |
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72 |
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73 /* An input file managed by the plugin library. */ |
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74 |
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75 struct ld_plugin_input_file |
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76 { |
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77 const char *name; |
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78 int fd; |
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79 off_t offset; |
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80 off_t filesize; |
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81 void *handle; |
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82 }; |
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83 |
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84 /* A symbol belonging to an input file managed by the plugin library. */ |
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85 |
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86 struct ld_plugin_symbol |
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87 { |
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88 char *name; |
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89 char *version; |
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90 int def; |
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91 int visibility; |
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92 uint64_t size; |
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93 char *comdat_key; |
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94 int resolution; |
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95 }; |
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96 |
111 | 97 /* An object's section. */ |
98 | |
99 struct ld_plugin_section | |
100 { | |
101 const void* handle; | |
102 unsigned int shndx; | |
103 }; | |
104 | |
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105 /* Whether the symbol is a definition, reference, or common, weak or not. */ |
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106 |
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107 enum ld_plugin_symbol_kind |
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108 { |
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109 LDPK_DEF, |
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110 LDPK_WEAKDEF, |
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111 LDPK_UNDEF, |
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112 LDPK_WEAKUNDEF, |
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113 LDPK_COMMON |
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114 }; |
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115 |
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116 /* The visibility of the symbol. */ |
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117 |
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118 enum ld_plugin_symbol_visibility |
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119 { |
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120 LDPV_DEFAULT, |
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121 LDPV_PROTECTED, |
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122 LDPV_INTERNAL, |
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123 LDPV_HIDDEN |
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124 }; |
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125 |
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126 /* How a symbol is resolved. */ |
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127 |
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128 enum ld_plugin_symbol_resolution |
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129 { |
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130 LDPR_UNKNOWN = 0, |
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131 |
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132 /* Symbol is still undefined at this point. */ |
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133 LDPR_UNDEF, |
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134 |
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135 /* This is the prevailing definition of the symbol, with references from |
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136 regular object code. */ |
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137 LDPR_PREVAILING_DEF, |
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138 |
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139 /* This is the prevailing definition of the symbol, with no |
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140 references from regular objects. It is only referenced from IR |
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141 code. */ |
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142 LDPR_PREVAILING_DEF_IRONLY, |
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143 |
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144 /* This definition was pre-empted by a definition in a regular |
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145 object file. */ |
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146 LDPR_PREEMPTED_REG, |
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147 |
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148 /* This definition was pre-empted by a definition in another IR file. */ |
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149 LDPR_PREEMPTED_IR, |
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150 |
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151 /* This symbol was resolved by a definition in another IR file. */ |
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152 LDPR_RESOLVED_IR, |
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153 |
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154 /* This symbol was resolved by a definition in a regular object |
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155 linked into the main executable. */ |
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156 LDPR_RESOLVED_EXEC, |
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157 |
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158 /* This symbol was resolved by a definition in a shared object. */ |
111 | 159 LDPR_RESOLVED_DYN, |
160 | |
161 /* This is the prevailing definition of the symbol, with no | |
162 references from regular objects. It is only referenced from IR | |
163 code, but the symbol is exported and may be referenced from | |
164 a dynamic object (not seen at link time). */ | |
165 LDPR_PREVAILING_DEF_IRONLY_EXP | |
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166 }; |
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167 |
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168 /* The plugin library's "claim file" handler. */ |
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169 |
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170 typedef |
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171 enum ld_plugin_status |
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172 (*ld_plugin_claim_file_handler) ( |
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173 const struct ld_plugin_input_file *file, int *claimed); |
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174 |
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175 /* The plugin library's "all symbols read" handler. */ |
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176 |
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177 typedef |
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178 enum ld_plugin_status |
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179 (*ld_plugin_all_symbols_read_handler) (void); |
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180 |
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181 /* The plugin library's cleanup handler. */ |
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182 |
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183 typedef |
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184 enum ld_plugin_status |
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185 (*ld_plugin_cleanup_handler) (void); |
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186 |
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187 /* The linker's interface for registering the "claim file" handler. */ |
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188 |
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189 typedef |
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190 enum ld_plugin_status |
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191 (*ld_plugin_register_claim_file) (ld_plugin_claim_file_handler handler); |
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192 |
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193 /* The linker's interface for registering the "all symbols read" handler. */ |
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194 |
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195 typedef |
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196 enum ld_plugin_status |
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197 (*ld_plugin_register_all_symbols_read) ( |
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198 ld_plugin_all_symbols_read_handler handler); |
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199 |
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200 /* The linker's interface for registering the cleanup handler. */ |
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201 |
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202 typedef |
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203 enum ld_plugin_status |
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204 (*ld_plugin_register_cleanup) (ld_plugin_cleanup_handler handler); |
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205 |
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206 /* The linker's interface for adding symbols from a claimed input file. */ |
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207 |
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208 typedef |
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209 enum ld_plugin_status |
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210 (*ld_plugin_add_symbols) (void *handle, int nsyms, |
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211 const struct ld_plugin_symbol *syms); |
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212 |
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213 /* The linker's interface for getting the input file information with |
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214 an open (possibly re-opened) file descriptor. */ |
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215 |
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216 typedef |
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217 enum ld_plugin_status |
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218 (*ld_plugin_get_input_file) (const void *handle, |
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219 struct ld_plugin_input_file *file); |
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220 |
111 | 221 typedef |
222 enum ld_plugin_status | |
223 (*ld_plugin_get_view) (const void *handle, const void **viewp); | |
224 | |
55
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225 /* The linker's interface for releasing the input file. */ |
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226 |
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227 typedef |
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228 enum ld_plugin_status |
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229 (*ld_plugin_release_input_file) (const void *handle); |
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230 |
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231 /* The linker's interface for retrieving symbol resolution information. */ |
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232 |
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233 typedef |
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234 enum ld_plugin_status |
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235 (*ld_plugin_get_symbols) (const void *handle, int nsyms, |
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236 struct ld_plugin_symbol *syms); |
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237 |
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238 /* The linker's interface for adding a compiled input file. */ |
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239 |
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240 typedef |
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241 enum ld_plugin_status |
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242 (*ld_plugin_add_input_file) (const char *pathname); |
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243 |
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244 /* The linker's interface for adding a library that should be searched. */ |
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245 |
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246 typedef |
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247 enum ld_plugin_status |
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248 (*ld_plugin_add_input_library) (const char *libname); |
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249 |
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250 /* The linker's interface for adding a library path that should be searched. */ |
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251 |
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252 typedef |
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253 enum ld_plugin_status |
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254 (*ld_plugin_set_extra_library_path) (const char *path); |
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255 |
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256 /* The linker's interface for issuing a warning or error message. */ |
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257 |
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258 typedef |
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259 enum ld_plugin_status |
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260 (*ld_plugin_message) (int level, const char *format, ...); |
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261 |
111 | 262 /* The linker's interface for retrieving the number of sections in an object. |
263 The handle is obtained in the claim_file handler. This interface should | |
264 only be invoked in the claim_file handler. This function sets *COUNT to | |
265 the number of sections in the object. */ | |
266 | |
267 typedef | |
268 enum ld_plugin_status | |
269 (*ld_plugin_get_input_section_count) (const void* handle, unsigned int *count); | |
270 | |
271 /* The linker's interface for retrieving the section type of a specific | |
272 section in an object. This interface should only be invoked in the | |
273 claim_file handler. This function sets *TYPE to an ELF SHT_xxx value. */ | |
274 | |
275 typedef | |
276 enum ld_plugin_status | |
277 (*ld_plugin_get_input_section_type) (const struct ld_plugin_section section, | |
278 unsigned int *type); | |
279 | |
280 /* The linker's interface for retrieving the name of a specific section in | |
281 an object. This interface should only be invoked in the claim_file handler. | |
282 This function sets *SECTION_NAME_PTR to a null-terminated buffer allocated | |
283 by malloc. The plugin must free *SECTION_NAME_PTR. */ | |
284 | |
285 typedef | |
286 enum ld_plugin_status | |
287 (*ld_plugin_get_input_section_name) (const struct ld_plugin_section section, | |
288 char **section_name_ptr); | |
289 | |
290 /* The linker's interface for retrieving the contents of a specific section | |
291 in an object. This interface should only be invoked in the claim_file | |
292 handler. This function sets *SECTION_CONTENTS to point to a buffer that is | |
293 valid until clam_file handler returns. It sets *LEN to the size of the | |
294 buffer. */ | |
295 | |
296 typedef | |
297 enum ld_plugin_status | |
298 (*ld_plugin_get_input_section_contents) (const struct ld_plugin_section section, | |
299 const unsigned char **section_contents, | |
300 size_t* len); | |
301 | |
302 /* The linker's interface for specifying the desired order of sections. | |
303 The sections should be specifed using the array SECTION_LIST in the | |
304 order in which they should appear in the final layout. NUM_SECTIONS | |
305 specifies the number of entries in each array. This should be invoked | |
306 in the all_symbols_read handler. */ | |
307 | |
308 typedef | |
309 enum ld_plugin_status | |
310 (*ld_plugin_update_section_order) (const struct ld_plugin_section *section_list, | |
311 unsigned int num_sections); | |
312 | |
313 /* The linker's interface for specifying that reordering of sections is | |
314 desired so that the linker can prepare for it. This should be invoked | |
315 before update_section_order, preferably in the claim_file handler. */ | |
316 | |
317 typedef | |
318 enum ld_plugin_status | |
319 (*ld_plugin_allow_section_ordering) (void); | |
320 | |
321 /* The linker's interface for specifying that a subset of sections is | |
322 to be mapped to a unique segment. If the plugin wants to call | |
323 unique_segment_for_sections, it must call this function from a | |
324 claim_file_handler or when it is first loaded. */ | |
325 | |
326 typedef | |
327 enum ld_plugin_status | |
328 (*ld_plugin_allow_unique_segment_for_sections) (void); | |
329 | |
330 /* The linker's interface for specifying that a specific set of sections | |
331 must be mapped to a unique segment. ELF segments do not have names | |
332 and the NAME is used as the name of the newly created output section | |
333 that is then placed in the unique PT_LOAD segment. FLAGS is used to | |
334 specify if any additional segment flags need to be set. For instance, | |
335 a specific segment flag can be set to identify this segment. Unsetting | |
336 segment flags that would be set by default is not possible. The | |
337 parameter SEGMENT_ALIGNMENT when non-zero will override the default. */ | |
338 | |
339 typedef | |
340 enum ld_plugin_status | |
341 (*ld_plugin_unique_segment_for_sections) ( | |
342 const char* segment_name, | |
343 uint64_t segment_flags, | |
344 uint64_t segment_alignment, | |
345 const struct ld_plugin_section * section_list, | |
346 unsigned int num_sections); | |
347 | |
348 /* The linker's interface for retrieving the section alignment requirement | |
349 of a specific section in an object. This interface should only be invoked in the | |
350 claim_file handler. This function sets *ADDRALIGN to the ELF sh_addralign | |
351 value of the input section. */ | |
352 | |
353 typedef | |
354 enum ld_plugin_status | |
355 (*ld_plugin_get_input_section_alignment) (const struct ld_plugin_section section, | |
356 unsigned int *addralign); | |
357 | |
358 /* The linker's interface for retrieving the section size of a specific section | |
359 in an object. This interface should only be invoked in the claim_file handler. | |
360 This function sets *SECSIZE to the ELF sh_size | |
361 value of the input section. */ | |
362 | |
363 typedef | |
364 enum ld_plugin_status | |
365 (*ld_plugin_get_input_section_size) (const struct ld_plugin_section section, | |
366 uint64_t *secsize); | |
367 | |
131 | 368 typedef |
369 enum ld_plugin_status | |
370 (*ld_plugin_new_input_handler) (const struct ld_plugin_input_file *file); | |
371 | |
372 /* The linker's interface for registering the "new_input" handler. This handler | |
373 will be notified when a new input file has been added after the | |
374 all_symbols_read event, allowing the plugin to, for example, set a unique | |
375 segment for sections in plugin-generated input files. */ | |
376 | |
377 typedef | |
378 enum ld_plugin_status | |
379 (*ld_plugin_register_new_input) (ld_plugin_new_input_handler handler); | |
380 | |
381 /* The linker's interface for getting the list of wrapped symbols using the | |
382 --wrap option. This sets *NUM_SYMBOLS to number of wrapped symbols and | |
383 *WRAP_SYMBOL_LIST to the list of wrapped symbols. */ | |
384 | |
385 typedef | |
386 enum ld_plugin_status | |
387 (*ld_plugin_get_wrap_symbols) (uint64_t *num_symbols, | |
388 const char ***wrap_symbol_list); | |
389 | |
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390 enum ld_plugin_level |
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391 { |
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392 LDPL_INFO, |
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393 LDPL_WARNING, |
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394 LDPL_ERROR, |
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395 LDPL_FATAL |
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396 }; |
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397 |
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398 /* Values for the tv_tag field of the transfer vector. */ |
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399 |
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400 enum ld_plugin_tag |
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401 { |
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402 LDPT_NULL = 0, |
111 | 403 LDPT_API_VERSION = 1, |
404 LDPT_GOLD_VERSION = 2, | |
405 LDPT_LINKER_OUTPUT = 3, | |
406 LDPT_OPTION = 4, | |
407 LDPT_REGISTER_CLAIM_FILE_HOOK = 5, | |
408 LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK = 6, | |
409 LDPT_REGISTER_CLEANUP_HOOK = 7, | |
410 LDPT_ADD_SYMBOLS = 8, | |
411 LDPT_GET_SYMBOLS = 9, | |
412 LDPT_ADD_INPUT_FILE = 10, | |
413 LDPT_MESSAGE = 11, | |
414 LDPT_GET_INPUT_FILE = 12, | |
415 LDPT_RELEASE_INPUT_FILE = 13, | |
416 LDPT_ADD_INPUT_LIBRARY = 14, | |
417 LDPT_OUTPUT_NAME = 15, | |
418 LDPT_SET_EXTRA_LIBRARY_PATH = 16, | |
419 LDPT_GNU_LD_VERSION = 17, | |
420 LDPT_GET_VIEW = 18, | |
421 LDPT_GET_INPUT_SECTION_COUNT = 19, | |
422 LDPT_GET_INPUT_SECTION_TYPE = 20, | |
423 LDPT_GET_INPUT_SECTION_NAME = 21, | |
424 LDPT_GET_INPUT_SECTION_CONTENTS = 22, | |
425 LDPT_UPDATE_SECTION_ORDER = 23, | |
426 LDPT_ALLOW_SECTION_ORDERING = 24, | |
427 LDPT_GET_SYMBOLS_V2 = 25, | |
428 LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS = 26, | |
429 LDPT_UNIQUE_SEGMENT_FOR_SECTIONS = 27, | |
430 LDPT_GET_SYMBOLS_V3 = 28, | |
431 LDPT_GET_INPUT_SECTION_ALIGNMENT = 29, | |
131 | 432 LDPT_GET_INPUT_SECTION_SIZE = 30, |
433 LDPT_REGISTER_NEW_INPUT_HOOK = 31, | |
434 LDPT_GET_WRAP_SYMBOLS = 32 | |
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435 }; |
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436 |
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437 /* The plugin transfer vector. */ |
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438 |
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439 struct ld_plugin_tv |
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440 { |
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441 enum ld_plugin_tag tv_tag; |
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442 union |
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443 { |
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444 int tv_val; |
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445 const char *tv_string; |
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446 ld_plugin_register_claim_file tv_register_claim_file; |
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447 ld_plugin_register_all_symbols_read tv_register_all_symbols_read; |
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448 ld_plugin_register_cleanup tv_register_cleanup; |
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449 ld_plugin_add_symbols tv_add_symbols; |
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450 ld_plugin_get_symbols tv_get_symbols; |
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451 ld_plugin_add_input_file tv_add_input_file; |
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452 ld_plugin_message tv_message; |
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453 ld_plugin_get_input_file tv_get_input_file; |
111 | 454 ld_plugin_get_view tv_get_view; |
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455 ld_plugin_release_input_file tv_release_input_file; |
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456 ld_plugin_add_input_library tv_add_input_library; |
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457 ld_plugin_set_extra_library_path tv_set_extra_library_path; |
111 | 458 ld_plugin_get_input_section_count tv_get_input_section_count; |
459 ld_plugin_get_input_section_type tv_get_input_section_type; | |
460 ld_plugin_get_input_section_name tv_get_input_section_name; | |
461 ld_plugin_get_input_section_contents tv_get_input_section_contents; | |
462 ld_plugin_update_section_order tv_update_section_order; | |
463 ld_plugin_allow_section_ordering tv_allow_section_ordering; | |
464 ld_plugin_allow_unique_segment_for_sections tv_allow_unique_segment_for_sections; | |
465 ld_plugin_unique_segment_for_sections tv_unique_segment_for_sections; | |
466 ld_plugin_get_input_section_alignment tv_get_input_section_alignment; | |
467 ld_plugin_get_input_section_size tv_get_input_section_size; | |
131 | 468 ld_plugin_register_new_input tv_register_new_input; |
469 ld_plugin_get_wrap_symbols tv_get_wrap_symbols; | |
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470 } tv_u; |
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471 }; |
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472 |
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473 /* The plugin library's "onload" entry point. */ |
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474 |
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475 typedef |
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476 enum ld_plugin_status |
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477 (*ld_plugin_onload) (struct ld_plugin_tv *tv); |
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478 |
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479 #ifdef __cplusplus |
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480 } |
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481 #endif |
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482 |
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483 #endif /* !defined(PLUGIN_API_H) */ |