1 // readsyms.cc -- read input file symbols for gold
17 // Class read_symbols.
19 Read_symbols::~Read_symbols()
21 // The this_blocker_ and next_blocker_ pointers are passed on to the
25 // Return whether a Read_symbols task is runnable. We can read an
26 // ordinary input file immediately. For an archive specified using
27 // -l, we have to wait until the search path is complete.
29 Task::Is_runnable_type
30 Read_symbols::is_runnable(Workqueue*)
32 if (this->input_.is_file()
33 && this->input_.file().is_lib()
34 && this->dirpath_.token().is_blocked())
40 // Return a Task_locker for a Read_symbols task. We don't need any
44 Read_symbols::locks(Workqueue*)
49 // Run a Read_symbols task. This is where we actually read the
50 // symbols and relocations.
53 Read_symbols::run(Workqueue* workqueue)
55 if (this->input_.is_group())
57 assert(this->input_group_ == NULL);
58 this->do_group(workqueue);
62 Input_file* input_file = new Input_file(this->input_.file());
63 input_file->open(this->options_, this->dirpath_);
65 // Read enough of the file to pick up the entire ELF header.
67 int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
69 const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes);
72 static unsigned char elfmagic[4] =
74 elfcpp::ELFMAG0, elfcpp::ELFMAG1,
75 elfcpp::ELFMAG2, elfcpp::ELFMAG3
77 if (memcmp(p, elfmagic, 4) == 0)
79 // This is an ELF object.
81 if (this->input_group_ != NULL)
84 _("%s: %s: ordinary object found in input group\n"),
85 program_name, input_file->name());
89 Object* obj = make_elf_object(this->input_.file().name(),
90 input_file, 0, p, bytes);
92 Read_symbols_data* sd = new Read_symbols_data;
93 obj->read_symbols(sd);
94 workqueue->queue_front(new Add_symbols(this->input_objects_,
95 this->symtab_, this->layout_,
98 this->next_blocker_));
100 // Opening the file locked it, so now we need to unlock it.
101 input_file->file().unlock();
107 if (bytes >= Archive::sarmag)
109 if (memcmp(p, Archive::armag, Archive::sarmag) == 0)
111 // This is an archive.
112 Archive* arch = new Archive(this->input_.file().name(), input_file);
114 workqueue->queue(new Add_archive_symbols(this->symtab_,
116 this->input_objects_,
120 this->next_blocker_));
125 // Here we have to handle any other input file types we need.
126 fprintf(stderr, _("%s: %s: not an object or archive\n"),
127 program_name, input_file->file().filename().c_str());
131 // Handle a group. We need to walk through the arguments over and
132 // over until we don't see any new undefined symbols. We do this by
133 // setting off Read_symbols Tasks as usual, but recording the archive
134 // entries instead of deleting them. We also start a Finish_group
135 // Task which runs after we've read all the symbols. In that task we
136 // process the archives in a loop until we are done.
139 Read_symbols::do_group(Workqueue* workqueue)
141 Input_group* input_group = new Input_group();
143 const Input_file_group* group = this->input_.group();
144 Task_token* this_blocker = this->this_blocker_;
145 for (Input_file_group::const_iterator p = group->begin();
149 const Input_argument& arg(*p);
150 assert(arg.is_file());
152 Task_token* next_blocker = new Task_token();
153 next_blocker->add_blocker();
154 workqueue->queue(new Read_symbols(this->options_, this->input_objects_,
155 this->symtab_, this->layout_,
156 this->dirpath_, arg, input_group,
157 this_blocker, next_blocker));
158 this_blocker = next_blocker;
161 const int saw_undefined = this->symtab_->saw_undefined();
162 workqueue->queue(new Finish_group(this->input_objects_,
168 this->next_blocker_));
171 // Class Add_symbols.
173 Add_symbols::~Add_symbols()
175 if (this->this_blocker_ != NULL)
176 delete this->this_blocker_;
177 // next_blocker_ is deleted by the task associated with the next
181 // We are blocked by this_blocker_. We block next_blocker_. We also
184 Task::Is_runnable_type
185 Add_symbols::is_runnable(Workqueue*)
187 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
189 if (this->object_->is_locked())
194 class Add_symbols::Add_symbols_locker : public Task_locker
197 Add_symbols_locker(Task_token& token, Workqueue* workqueue,
199 : blocker_(token, workqueue), objlock_(*object)
203 Task_locker_block blocker_;
204 Task_locker_obj<Object> objlock_;
208 Add_symbols::locks(Workqueue* workqueue)
210 return new Add_symbols_locker(*this->next_blocker_, workqueue,
214 // Add the symbols in the object to the symbol table.
217 Add_symbols::run(Workqueue*)
219 this->input_objects_->add_object(this->object_);
220 this->object_->layout(this->layout_, this->sd_);
221 this->object_->add_symbols(this->symtab_, this->sd_);
226 // Class Finish_group.
228 Finish_group::~Finish_group()
230 if (this->this_blocker_ != NULL)
231 delete this->this_blocker_;
232 // next_blocker_ is deleted by the task associated with the next
233 // input file following the group.
236 // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_.
238 Task::Is_runnable_type
239 Finish_group::is_runnable(Workqueue*)
241 if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
247 Finish_group::locks(Workqueue* workqueue)
249 return new Task_locker_block(*this->next_blocker_, workqueue);
252 // Loop over the archives until there are no new undefined symbols.
255 Finish_group::run(Workqueue*)
257 int saw_undefined = this->saw_undefined_;
258 while (saw_undefined != this->symtab_->saw_undefined())
260 saw_undefined = this->symtab_->saw_undefined();
262 for (Input_group::const_iterator p = this->input_group_->begin();
263 p != this->input_group_->end();
266 Task_lock_obj<Archive> tl(**p);
268 (*p)->add_symbols(this->symtab_, this->layout_,
269 this->input_objects_);
273 // Delete all the archives now that we no longer need them.
274 for (Input_group::const_iterator p = this->input_group_->begin();
275 p != this->input_group_->end();
278 delete this->input_group_;
281 } // End namespace gold.