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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" | |
a2fb1b05 | 10 | #include "object.h" |
61ba1cf9 ILT |
11 | #include "archive.h" |
12 | #include "readsyms.h" | |
bae7f79e ILT |
13 | |
14 | namespace gold | |
15 | { | |
16 | ||
17 | // Class read_symbols. | |
18 | ||
19 | Read_symbols::~Read_symbols() | |
20 | { | |
21 | // The this_blocker_ and next_blocker_ pointers are passed on to the | |
22 | // Add_symbols task. | |
23 | } | |
24 | ||
ead1e424 ILT |
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. | |
bae7f79e ILT |
28 | |
29 | Task::Is_runnable_type | |
30 | Read_symbols::is_runnable(Workqueue*) | |
31 | { | |
ead1e424 ILT |
32 | if (this->input_.is_file() |
33 | && this->input_.file().is_lib() | |
34 | && this->dirpath_.token().is_blocked()) | |
bae7f79e ILT |
35 | return IS_BLOCKED; |
36 | ||
37 | return IS_RUNNABLE; | |
38 | } | |
39 | ||
40 | // Return a Task_locker for a Read_symbols task. We don't need any | |
41 | // locks here. | |
42 | ||
43 | Task_locker* | |
44 | Read_symbols::locks(Workqueue*) | |
45 | { | |
46 | return NULL; | |
47 | } | |
48 | ||
49 | // Run a Read_symbols task. This is where we actually read the | |
50 | // symbols and relocations. | |
51 | ||
52 | void | |
53 | Read_symbols::run(Workqueue* workqueue) | |
54 | { | |
ead1e424 ILT |
55 | if (this->input_.is_group()) |
56 | { | |
57 | assert(this->input_group_ == NULL); | |
58 | this->do_group(workqueue); | |
59 | return; | |
60 | } | |
61 | ||
62 | Input_file* input_file = new Input_file(this->input_.file()); | |
bae7f79e ILT |
63 | input_file->open(this->options_, this->dirpath_); |
64 | ||
65 | // Read enough of the file to pick up the entire ELF header. | |
66 | ||
67 | int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
68 | off_t bytes; | |
69 | const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes); | |
70 | if (bytes >= 4) | |
71 | { | |
72 | static unsigned char elfmagic[4] = | |
73 | { | |
74 | elfcpp::ELFMAG0, elfcpp::ELFMAG1, | |
75 | elfcpp::ELFMAG2, elfcpp::ELFMAG3 | |
76 | }; | |
77 | if (memcmp(p, elfmagic, 4) == 0) | |
78 | { | |
79 | // This is an ELF object. | |
a2fb1b05 | 80 | |
ead1e424 ILT |
81 | if (this->input_group_ != NULL) |
82 | { | |
83 | fprintf(stderr, | |
84 | _("%s: %s: ordinary object found in input group\n"), | |
85 | program_name, input_file->name()); | |
86 | gold_exit(false); | |
87 | } | |
88 | ||
89 | Object* obj = make_elf_object(this->input_.file().name(), | |
90 | input_file, 0, p, bytes); | |
a2fb1b05 | 91 | |
12e14209 ILT |
92 | Read_symbols_data* sd = new Read_symbols_data; |
93 | obj->read_symbols(sd); | |
ead1e424 ILT |
94 | workqueue->queue_front(new Add_symbols(this->input_objects_, |
95 | this->symtab_, this->layout_, | |
92e059d8 ILT |
96 | obj, sd, |
97 | this->this_blocker_, | |
98 | this->next_blocker_)); | |
bae7f79e ILT |
99 | |
100 | // Opening the file locked it, so now we need to unlock it. | |
101 | input_file->file().unlock(); | |
102 | ||
103 | return; | |
104 | } | |
105 | } | |
106 | ||
61ba1cf9 ILT |
107 | if (bytes >= Archive::sarmag) |
108 | { | |
109 | if (memcmp(p, Archive::armag, Archive::sarmag) == 0) | |
110 | { | |
111 | // This is an archive. | |
ead1e424 | 112 | Archive* arch = new Archive(this->input_.file().name(), input_file); |
61ba1cf9 ILT |
113 | arch->setup(); |
114 | workqueue->queue(new Add_archive_symbols(this->symtab_, | |
12e14209 | 115 | this->layout_, |
61ba1cf9 ILT |
116 | this->input_objects_, |
117 | arch, | |
ead1e424 | 118 | this->input_group_, |
61ba1cf9 ILT |
119 | this->this_blocker_, |
120 | this->next_blocker_)); | |
121 | return; | |
122 | } | |
123 | } | |
124 | ||
92e059d8 | 125 | // Here we have to handle any other input file types we need. |
61ba1cf9 ILT |
126 | fprintf(stderr, _("%s: %s: not an object or archive\n"), |
127 | program_name, input_file->file().filename().c_str()); | |
128 | gold_exit(false); | |
bae7f79e ILT |
129 | } |
130 | ||
ead1e424 ILT |
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. | |
137 | ||
138 | void | |
139 | Read_symbols::do_group(Workqueue* workqueue) | |
140 | { | |
141 | Input_group* input_group = new Input_group(); | |
142 | ||
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(); | |
146 | p != group->end(); | |
147 | ++p) | |
148 | { | |
149 | const Input_argument& arg(*p); | |
150 | assert(arg.is_file()); | |
151 | ||
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; | |
159 | } | |
160 | ||
161 | const int saw_undefined = this->symtab_->saw_undefined(); | |
162 | workqueue->queue(new Finish_group(this->input_objects_, | |
163 | this->symtab_, | |
164 | this->layout_, | |
165 | input_group, | |
166 | saw_undefined, | |
167 | this_blocker, | |
168 | this->next_blocker_)); | |
169 | } | |
170 | ||
bae7f79e ILT |
171 | // Class Add_symbols. |
172 | ||
173 | Add_symbols::~Add_symbols() | |
174 | { | |
175 | if (this->this_blocker_ != NULL) | |
176 | delete this->this_blocker_; | |
177 | // next_blocker_ is deleted by the task associated with the next | |
178 | // input file. | |
179 | } | |
180 | ||
a2fb1b05 ILT |
181 | // We are blocked by this_blocker_. We block next_blocker_. We also |
182 | // lock the file. | |
bae7f79e ILT |
183 | |
184 | Task::Is_runnable_type | |
185 | Add_symbols::is_runnable(Workqueue*) | |
186 | { | |
187 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) | |
188 | return IS_BLOCKED; | |
a2fb1b05 ILT |
189 | if (this->object_->is_locked()) |
190 | return IS_LOCKED; | |
bae7f79e ILT |
191 | return IS_RUNNABLE; |
192 | } | |
193 | ||
a2fb1b05 ILT |
194 | class Add_symbols::Add_symbols_locker : public Task_locker |
195 | { | |
196 | public: | |
197 | Add_symbols_locker(Task_token& token, Workqueue* workqueue, | |
198 | Object* object) | |
199 | : blocker_(token, workqueue), objlock_(*object) | |
200 | { } | |
201 | ||
202 | private: | |
203 | Task_locker_block blocker_; | |
204 | Task_locker_obj<Object> objlock_; | |
205 | }; | |
206 | ||
bae7f79e ILT |
207 | Task_locker* |
208 | Add_symbols::locks(Workqueue* workqueue) | |
209 | { | |
a2fb1b05 ILT |
210 | return new Add_symbols_locker(*this->next_blocker_, workqueue, |
211 | this->object_); | |
bae7f79e ILT |
212 | } |
213 | ||
ead1e424 ILT |
214 | // Add the symbols in the object to the symbol table. |
215 | ||
bae7f79e ILT |
216 | void |
217 | Add_symbols::run(Workqueue*) | |
218 | { | |
ead1e424 | 219 | this->input_objects_->add_object(this->object_); |
12e14209 | 220 | this->object_->layout(this->layout_, this->sd_); |
14bfc3f5 | 221 | this->object_->add_symbols(this->symtab_, this->sd_); |
12e14209 ILT |
222 | delete this->sd_; |
223 | this->sd_ = NULL; | |
bae7f79e ILT |
224 | } |
225 | ||
ead1e424 ILT |
226 | // Class Finish_group. |
227 | ||
228 | Finish_group::~Finish_group() | |
229 | { | |
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. | |
234 | } | |
235 | ||
236 | // We need to wait for THIS_BLOCKER_ and unblock NEXT_BLOCKER_. | |
237 | ||
238 | Task::Is_runnable_type | |
239 | Finish_group::is_runnable(Workqueue*) | |
240 | { | |
241 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) | |
242 | return IS_BLOCKED; | |
243 | return IS_RUNNABLE; | |
244 | } | |
245 | ||
246 | Task_locker* | |
247 | Finish_group::locks(Workqueue* workqueue) | |
248 | { | |
249 | return new Task_locker_block(*this->next_blocker_, workqueue); | |
250 | } | |
251 | ||
252 | // Loop over the archives until there are no new undefined symbols. | |
253 | ||
254 | void | |
255 | Finish_group::run(Workqueue*) | |
256 | { | |
257 | int saw_undefined = this->saw_undefined_; | |
258 | while (saw_undefined != this->symtab_->saw_undefined()) | |
259 | { | |
260 | saw_undefined = this->symtab_->saw_undefined(); | |
261 | ||
262 | for (Input_group::const_iterator p = this->input_group_->begin(); | |
263 | p != this->input_group_->end(); | |
264 | ++p) | |
265 | { | |
266 | Task_lock_obj<Archive> tl(**p); | |
267 | ||
268 | (*p)->add_symbols(this->symtab_, this->layout_, | |
269 | this->input_objects_); | |
270 | } | |
271 | } | |
272 | ||
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(); | |
276 | ++p) | |
277 | delete *p; | |
278 | delete this->input_group_; | |
279 | } | |
280 | ||
bae7f79e | 281 | } // End namespace gold. |