Commit | Line | Data |
---|---|---|
bae7f79e ILT |
1 | // readsyms.cc -- read input file symbols for gold |
2 | ||
3 | #include "gold.h" | |
4 | ||
5 | #include <cstring> | |
6 | ||
7 | #include "elfcpp.h" | |
8 | #include "options.h" | |
9 | #include "dirsearch.h" | |
f6ce93d6 | 10 | #include "symtab.h" |
a2fb1b05 | 11 | #include "object.h" |
61ba1cf9 | 12 | #include "archive.h" |
dbe717ef | 13 | #include "script.h" |
61ba1cf9 | 14 | #include "readsyms.h" |
bae7f79e ILT |
15 | |
16 | namespace gold | |
17 | { | |
18 | ||
19 | // Class read_symbols. | |
20 | ||
21 | Read_symbols::~Read_symbols() | |
22 | { | |
23 | // The this_blocker_ and next_blocker_ pointers are passed on to the | |
24 | // Add_symbols task. | |
25 | } | |
26 | ||
ead1e424 ILT |
27 | // Return whether a Read_symbols task is runnable. We can read an |
28 | // ordinary input file immediately. For an archive specified using | |
29 | // -l, we have to wait until the search path is complete. | |
bae7f79e ILT |
30 | |
31 | Task::Is_runnable_type | |
32 | Read_symbols::is_runnable(Workqueue*) | |
33 | { | |
dbe717ef ILT |
34 | if (this->input_argument_->is_file() |
35 | && this->input_argument_->file().is_lib() | |
ead1e424 | 36 | && this->dirpath_.token().is_blocked()) |
bae7f79e ILT |
37 | return IS_BLOCKED; |
38 | ||
39 | return IS_RUNNABLE; | |
40 | } | |
41 | ||
42 | // Return a Task_locker for a Read_symbols task. We don't need any | |
43 | // locks here. | |
44 | ||
45 | Task_locker* | |
46 | Read_symbols::locks(Workqueue*) | |
47 | { | |
48 | return NULL; | |
49 | } | |
50 | ||
51 | // Run a Read_symbols task. This is where we actually read the | |
52 | // symbols and relocations. | |
53 | ||
54 | void | |
55 | Read_symbols::run(Workqueue* workqueue) | |
56 | { | |
dbe717ef | 57 | if (this->input_argument_->is_group()) |
ead1e424 | 58 | { |
a3ad94ed | 59 | gold_assert(this->input_group_ == NULL); |
ead1e424 ILT |
60 | this->do_group(workqueue); |
61 | return; | |
62 | } | |
63 | ||
5a6f7e2d | 64 | Input_file* input_file = new Input_file(&this->input_argument_->file()); |
bae7f79e ILT |
65 | input_file->open(this->options_, this->dirpath_); |
66 | ||
67 | // Read enough of the file to pick up the entire ELF header. | |
68 | ||
69 | int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
70 | off_t bytes; | |
71 | const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes); | |
72 | if (bytes >= 4) | |
73 | { | |
74 | static unsigned char elfmagic[4] = | |
75 | { | |
76 | elfcpp::ELFMAG0, elfcpp::ELFMAG1, | |
77 | elfcpp::ELFMAG2, elfcpp::ELFMAG3 | |
78 | }; | |
79 | if (memcmp(p, elfmagic, 4) == 0) | |
80 | { | |
81 | // This is an ELF object. | |
a2fb1b05 | 82 | |
dbe717ef ILT |
83 | Object* obj = make_elf_object(input_file->filename(), |
84 | input_file, 0, p, bytes); | |
85 | ||
86 | // We don't have a way to record a non-archive in an input | |
87 | // group. If this is an ordinary object file, we can't | |
88 | // include it more than once anyhow. If this is a dynamic | |
89 | // object, then including it a second time changes nothing. | |
90 | if (this->input_group_ != NULL && !obj->is_dynamic()) | |
ead1e424 ILT |
91 | { |
92 | fprintf(stderr, | |
93 | _("%s: %s: ordinary object found in input group\n"), | |
94 | program_name, input_file->name()); | |
95 | gold_exit(false); | |
96 | } | |
97 | ||
12e14209 ILT |
98 | Read_symbols_data* sd = new Read_symbols_data; |
99 | obj->read_symbols(sd); | |
7e1edb90 | 100 | workqueue->queue_front(new Add_symbols(this->input_objects_, |
ead1e424 | 101 | this->symtab_, this->layout_, |
92e059d8 ILT |
102 | obj, sd, |
103 | this->this_blocker_, | |
104 | this->next_blocker_)); | |
bae7f79e ILT |
105 | |
106 | // Opening the file locked it, so now we need to unlock it. | |
107 | input_file->file().unlock(); | |
108 | ||
109 | return; | |
110 | } | |
111 | } | |
112 | ||
61ba1cf9 ILT |
113 | if (bytes >= Archive::sarmag) |
114 | { | |
115 | if (memcmp(p, Archive::armag, Archive::sarmag) == 0) | |
116 | { | |
117 | // This is an archive. | |
dbe717ef ILT |
118 | Archive* arch = new Archive(this->input_argument_->file().name(), |
119 | input_file); | |
61ba1cf9 | 120 | arch->setup(); |
7e1edb90 | 121 | workqueue->queue(new Add_archive_symbols(this->symtab_, |
12e14209 | 122 | this->layout_, |
61ba1cf9 ILT |
123 | this->input_objects_, |
124 | arch, | |
ead1e424 | 125 | this->input_group_, |
61ba1cf9 ILT |
126 | this->this_blocker_, |
127 | this->next_blocker_)); | |
128 | return; | |
129 | } | |
130 | } | |
131 | ||
dbe717ef ILT |
132 | if (bytes == 0) |
133 | { | |
134 | fprintf(stderr, _("%s: %s: file is empty\n"), | |
135 | program_name, input_file->file().filename().c_str()); | |
136 | gold_exit(false); | |
137 | } | |
138 | ||
139 | // Try to parse this file as a script. | |
140 | if (read_input_script(workqueue, this->options_, this->symtab_, | |
141 | this->layout_, this->dirpath_, this->input_objects_, | |
142 | this->input_group_, this->input_argument_, input_file, | |
143 | p, bytes, this->this_blocker_, this->next_blocker_)) | |
144 | return; | |
145 | ||
92e059d8 | 146 | // Here we have to handle any other input file types we need. |
61ba1cf9 ILT |
147 | fprintf(stderr, _("%s: %s: not an object or archive\n"), |
148 | program_name, input_file->file().filename().c_str()); | |
149 | gold_exit(false); | |
bae7f79e ILT |
150 | } |
151 | ||
ead1e424 ILT |
152 | // Handle a group. We need to walk through the arguments over and |
153 | // over until we don't see any new undefined symbols. We do this by | |
154 | // setting off Read_symbols Tasks as usual, but recording the archive | |
155 | // entries instead of deleting them. We also start a Finish_group | |
156 | // Task which runs after we've read all the symbols. In that task we | |
157 | // process the archives in a loop until we are done. | |
158 | ||
159 | void | |
160 | Read_symbols::do_group(Workqueue* workqueue) | |
161 | { | |
162 | Input_group* input_group = new Input_group(); | |
163 | ||
dbe717ef | 164 | const Input_file_group* group = this->input_argument_->group(); |
ead1e424 ILT |
165 | Task_token* this_blocker = this->this_blocker_; |
166 | for (Input_file_group::const_iterator p = group->begin(); | |
167 | p != group->end(); | |
168 | ++p) | |
169 | { | |
dbe717ef | 170 | const Input_argument* arg = &*p; |
a3ad94ed | 171 | gold_assert(arg->is_file()); |
ead1e424 ILT |
172 | |
173 | Task_token* next_blocker = new Task_token(); | |
174 | next_blocker->add_blocker(); | |
175 | workqueue->queue(new Read_symbols(this->options_, this->input_objects_, | |
176 | this->symtab_, this->layout_, | |
177 | this->dirpath_, arg, input_group, | |
178 | this_blocker, next_blocker)); | |
179 | this_blocker = next_blocker; | |
180 | } | |
181 | ||
182 | const int saw_undefined = this->symtab_->saw_undefined(); | |
7e1edb90 | 183 | workqueue->queue(new Finish_group(this->input_objects_, |
ead1e424 ILT |
184 | this->symtab_, |
185 | this->layout_, | |
186 | input_group, | |
187 | saw_undefined, | |
188 | this_blocker, | |
189 | this->next_blocker_)); | |
190 | } | |
191 | ||
bae7f79e ILT |
192 | // Class Add_symbols. |
193 | ||
194 | Add_symbols::~Add_symbols() | |
195 | { | |
196 | if (this->this_blocker_ != NULL) | |
197 | delete this->this_blocker_; | |
198 | // next_blocker_ is deleted by the task associated with the next | |
199 | // input file. | |
200 | } | |
201 | ||
a2fb1b05 ILT |
202 | // We are blocked by this_blocker_. We block next_blocker_. We also |
203 | // lock the file. | |
bae7f79e ILT |
204 | |
205 | Task::Is_runnable_type | |
206 | Add_symbols::is_runnable(Workqueue*) | |
207 | { | |
208 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) | |
209 | return IS_BLOCKED; | |
a2fb1b05 ILT |
210 | if (this->object_->is_locked()) |
211 | return IS_LOCKED; | |
bae7f79e ILT |
212 | return IS_RUNNABLE; |
213 | } | |
214 | ||
a2fb1b05 ILT |
215 | class Add_symbols::Add_symbols_locker : public Task_locker |
216 | { | |
217 | public: | |
218 | Add_symbols_locker(Task_token& token, Workqueue* workqueue, | |
219 | Object* object) | |
220 | : blocker_(token, workqueue), objlock_(*object) | |
221 | { } | |
222 | ||
223 | private: | |
224 | Task_locker_block blocker_; | |
225 | Task_locker_obj<Object> objlock_; | |
226 | }; | |
227 | ||
bae7f79e ILT |
228 | Task_locker* |
229 | Add_symbols::locks(Workqueue* workqueue) | |
230 | { | |
a2fb1b05 ILT |
231 | return new Add_symbols_locker(*this->next_blocker_, workqueue, |
232 | this->object_); | |
bae7f79e ILT |
233 | } |
234 | ||
ead1e424 ILT |
235 | // Add the symbols in the object to the symbol table. |
236 | ||
bae7f79e ILT |
237 | void |
238 | Add_symbols::run(Workqueue*) | |
239 | { | |
008db82e ILT |
240 | if (!this->input_objects_->add_object(this->object_)) |
241 | { | |
242 | // FIXME: We need to close the descriptor here. | |
243 | delete this->object_; | |
244 | } | |
245 | else | |
246 | { | |
7e1edb90 | 247 | this->object_->layout(this->symtab_, this->layout_, this->sd_); |
008db82e ILT |
248 | this->object_->add_symbols(this->symtab_, this->sd_); |
249 | } | |
12e14209 ILT |
250 | delete this->sd_; |
251 | this->sd_ = NULL; | |
bae7f79e ILT |
252 | } |
253 | ||
ead1e424 ILT |
254 | // Class Finish_group. |
255 | ||
256 | Finish_group::~Finish_group() | |
257 | { | |
258 | if (this->this_blocker_ != NULL) | |
259 | delete this->this_blocker_; | |
260 | // next_blocker_ is deleted by the task associated with the next | |
261 | // input file following the group. | |
262 | } | |
263 | ||
264 | // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_. | |
265 | ||
266 | Task::Is_runnable_type | |
267 | Finish_group::is_runnable(Workqueue*) | |
268 | { | |
269 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) | |
270 | return IS_BLOCKED; | |
271 | return IS_RUNNABLE; | |
272 | } | |
273 | ||
274 | Task_locker* | |
275 | Finish_group::locks(Workqueue* workqueue) | |
276 | { | |
277 | return new Task_locker_block(*this->next_blocker_, workqueue); | |
278 | } | |
279 | ||
280 | // Loop over the archives until there are no new undefined symbols. | |
281 | ||
282 | void | |
283 | Finish_group::run(Workqueue*) | |
284 | { | |
285 | int saw_undefined = this->saw_undefined_; | |
286 | while (saw_undefined != this->symtab_->saw_undefined()) | |
287 | { | |
288 | saw_undefined = this->symtab_->saw_undefined(); | |
289 | ||
290 | for (Input_group::const_iterator p = this->input_group_->begin(); | |
291 | p != this->input_group_->end(); | |
292 | ++p) | |
293 | { | |
294 | Task_lock_obj<Archive> tl(**p); | |
295 | ||
7e1edb90 | 296 | (*p)->add_symbols(this->symtab_, this->layout_, |
ead1e424 ILT |
297 | this->input_objects_); |
298 | } | |
299 | } | |
300 | ||
301 | // Delete all the archives now that we no longer need them. | |
302 | for (Input_group::const_iterator p = this->input_group_->begin(); | |
303 | p != this->input_group_->end(); | |
304 | ++p) | |
305 | delete *p; | |
306 | delete this->input_group_; | |
307 | } | |
308 | ||
bae7f79e | 309 | } // End namespace gold. |