| 1 | // cref.cc -- cross reference for gold |
| 2 | |
| 3 | // Copyright 2008 Free Software Foundation, Inc. |
| 4 | // Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include <cerrno> |
| 26 | #include <cstdio> |
| 27 | #include <cstring> |
| 28 | #include <map> |
| 29 | #include <string> |
| 30 | #include <vector> |
| 31 | |
| 32 | #include "object.h" |
| 33 | #include "archive.h" |
| 34 | #include "cref.h" |
| 35 | |
| 36 | namespace gold |
| 37 | { |
| 38 | |
| 39 | // Class Cref_inputs. This is used to hold the list of input files |
| 40 | // for cross referencing. |
| 41 | |
| 42 | class Cref_inputs |
| 43 | { |
| 44 | public: |
| 45 | Cref_inputs() |
| 46 | : objects_(), archives_(), current_(&this->objects_) |
| 47 | { } |
| 48 | |
| 49 | // Add an input object file. |
| 50 | void |
| 51 | add_object(Object* object); |
| 52 | |
| 53 | // Start adding an archive. We support nested archives for future |
| 54 | // flexibility. |
| 55 | void |
| 56 | add_archive_start(Archive*); |
| 57 | |
| 58 | // Finish adding an archive. |
| 59 | void |
| 60 | add_archive_stop(Archive*); |
| 61 | |
| 62 | // Report symbol counts. |
| 63 | void |
| 64 | print_symbol_counts(const Symbol_table*, FILE*) const; |
| 65 | |
| 66 | private: |
| 67 | // A list of input objects. |
| 68 | typedef std::vector<Object*> Objects; |
| 69 | |
| 70 | // Information we record for an archive. |
| 71 | struct Archive_info |
| 72 | { |
| 73 | // Archive name. |
| 74 | std::string name; |
| 75 | // List of objects included from the archive. |
| 76 | Objects* objects; |
| 77 | // Number of archive members. |
| 78 | size_t member_count; |
| 79 | }; |
| 80 | |
| 81 | // A mapping from the name of an archive to the list of objects in |
| 82 | // that archive. |
| 83 | typedef std::map<std::string, Archive_info> Archives; |
| 84 | |
| 85 | // Report symbol counts for a list of Objects. |
| 86 | void |
| 87 | print_objects_symbol_counts(const Symbol_table*, FILE*, const Objects*) const; |
| 88 | |
| 89 | // Report symbol counts for an object. |
| 90 | void |
| 91 | print_object_symbol_counts(const Symbol_table*, FILE*, const Object*) const; |
| 92 | |
| 93 | // List of input objects. |
| 94 | Objects objects_; |
| 95 | // List of input archives. This is a mapping from the archive file |
| 96 | // name to the list of objects. |
| 97 | Archives archives_; |
| 98 | // The list to which we are currently adding objects. |
| 99 | Objects* current_; |
| 100 | }; |
| 101 | |
| 102 | // Add an object. |
| 103 | |
| 104 | void |
| 105 | Cref_inputs::add_object(Object* object) |
| 106 | { |
| 107 | this->current_->push_back(object); |
| 108 | } |
| 109 | |
| 110 | // Start adding an archive. |
| 111 | |
| 112 | void |
| 113 | Cref_inputs::add_archive_start(Archive* archive) |
| 114 | { |
| 115 | gold_assert(this->current_ == &this->objects_); |
| 116 | if (this->archives_.find(archive->name()) == this->archives_.end()) |
| 117 | { |
| 118 | Archive_info* pai = &this->archives_[archive->name()]; |
| 119 | pai->name = archive->filename(); |
| 120 | pai->objects = new Objects(); |
| 121 | pai->member_count = archive->count_members(); |
| 122 | } |
| 123 | this->current_ = this->archives_[archive->name()].objects; |
| 124 | } |
| 125 | |
| 126 | // Stop adding an archive. |
| 127 | |
| 128 | void |
| 129 | Cref_inputs::add_archive_stop(Archive*) |
| 130 | { |
| 131 | gold_assert(this->current_ != &this->objects_); |
| 132 | this->current_ = &this->objects_; |
| 133 | } |
| 134 | |
| 135 | // Report symbol counts for an object. |
| 136 | |
| 137 | void |
| 138 | Cref_inputs::print_object_symbol_counts(const Symbol_table* symtab, |
| 139 | FILE* f, |
| 140 | const Object* object) const |
| 141 | { |
| 142 | size_t defined, used; |
| 143 | object->get_global_symbol_counts(symtab, &defined, &used); |
| 144 | fprintf(f, "symbols %s %zu %zu\n", object->name().c_str(), defined, used); |
| 145 | } |
| 146 | |
| 147 | // Report symbol counts for a list of Inputs. |
| 148 | |
| 149 | void |
| 150 | Cref_inputs::print_objects_symbol_counts(const Symbol_table* symtab, |
| 151 | FILE* f, |
| 152 | const Objects* objects) const |
| 153 | { |
| 154 | for (Objects::const_iterator p = objects->begin(); |
| 155 | p != objects->end(); |
| 156 | ++p) |
| 157 | this->print_object_symbol_counts(symtab, f, *p); |
| 158 | } |
| 159 | |
| 160 | // Print symbol counts. This implements --print-symbol-counts. This |
| 161 | // is intended to be easily read by a program. This outputs a series |
| 162 | // of lines. There are two different types of lines. |
| 163 | |
| 164 | // The first is "symbols FILENAME DEFINED USED". FILENAME is the name |
| 165 | // of an object file included in the link; for an archive, this will |
| 166 | // be ARCHIVEFILENAME(MEMBERNAME). DEFINED is the number of symbols |
| 167 | // which the object file defines. USED is the number of symbols which |
| 168 | // are used in the final output; this is the number of symbols which |
| 169 | // appear in the final output table as having been defined by this |
| 170 | // object. These numbers will be different when weak symbols are |
| 171 | // used, and they will be different for dynamic objects. |
| 172 | |
| 173 | // The second is "archives FILENAME MEMBERS USED". FILENAME is the |
| 174 | // name of an archive file included in the link. MEMBERS is the |
| 175 | // number of members of the archive. USED is the number of archive |
| 176 | // members included in the link. |
| 177 | |
| 178 | void |
| 179 | Cref_inputs::print_symbol_counts(const Symbol_table* symtab, FILE* f) const |
| 180 | { |
| 181 | this->print_objects_symbol_counts(symtab, f, &this->objects_); |
| 182 | for (Archives::const_iterator p = this->archives_.begin(); |
| 183 | p != this->archives_.end(); |
| 184 | ++p) |
| 185 | { |
| 186 | fprintf(f, "archive %s %zu %zu\n", p->second.name.c_str(), |
| 187 | p->second.member_count, p->second.objects->size()); |
| 188 | this->print_objects_symbol_counts(symtab, f, p->second.objects); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | // Class Cref. |
| 193 | |
| 194 | // Make sure the Cref_inputs object has been created. |
| 195 | |
| 196 | void |
| 197 | Cref::need_inputs() |
| 198 | { |
| 199 | if (this->inputs_ == NULL) |
| 200 | this->inputs_ = new Cref_inputs(); |
| 201 | } |
| 202 | |
| 203 | // Add an input object file. |
| 204 | |
| 205 | void |
| 206 | Cref::add_object(Object* object) |
| 207 | { |
| 208 | this->need_inputs(); |
| 209 | this->inputs_->add_object(object); |
| 210 | } |
| 211 | |
| 212 | // Start adding an archive. |
| 213 | |
| 214 | void |
| 215 | Cref::add_archive_start(Archive* archive) |
| 216 | { |
| 217 | this->need_inputs(); |
| 218 | this->inputs_->add_archive_start(archive); |
| 219 | } |
| 220 | |
| 221 | // Stop adding an archive. |
| 222 | |
| 223 | void |
| 224 | Cref::add_archive_stop(Archive* archive) |
| 225 | { |
| 226 | this->inputs_->add_archive_stop(archive); |
| 227 | } |
| 228 | |
| 229 | // Print symbol counts. |
| 230 | |
| 231 | void |
| 232 | Cref::print_symbol_counts(const Symbol_table* symtab) const |
| 233 | { |
| 234 | if (parameters->options().user_set_print_symbol_counts() |
| 235 | && this->inputs_ != NULL) |
| 236 | { |
| 237 | FILE* f; |
| 238 | if (strcmp(parameters->options().print_symbol_counts(), "-") == 0) |
| 239 | f = stdout; |
| 240 | else |
| 241 | { |
| 242 | f = fopen(parameters->options().print_symbol_counts(), "w"); |
| 243 | if (f == NULL) |
| 244 | gold_error(_("cannot open symbol count file %s: %s"), |
| 245 | parameters->options().print_symbol_counts(), |
| 246 | strerror(errno)); |
| 247 | } |
| 248 | if (f != NULL) |
| 249 | this->inputs_->print_symbol_counts(symtab, f); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | } // End namespace gold. |