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" | |
10 | #include "readsyms.h" | |
a2fb1b05 | 11 | #include "object.h" |
bae7f79e ILT |
12 | |
13 | namespace gold | |
14 | { | |
15 | ||
16 | // Class read_symbols. | |
17 | ||
18 | Read_symbols::~Read_symbols() | |
19 | { | |
20 | // The this_blocker_ and next_blocker_ pointers are passed on to the | |
21 | // Add_symbols task. | |
22 | } | |
23 | ||
24 | // Return whether a Read_symbols task is runnable. We need write | |
25 | // access to the symbol table. We can read an ordinary input file | |
26 | // immediately. For an archive specified using -l, we have to wait | |
27 | // until the search path is complete. | |
28 | ||
29 | Task::Is_runnable_type | |
30 | Read_symbols::is_runnable(Workqueue*) | |
31 | { | |
32 | if (this->input_.is_lib() && this->dirpath_.token().is_blocked()) | |
33 | return IS_BLOCKED; | |
34 | ||
35 | return IS_RUNNABLE; | |
36 | } | |
37 | ||
38 | // Return a Task_locker for a Read_symbols task. We don't need any | |
39 | // locks here. | |
40 | ||
41 | Task_locker* | |
42 | Read_symbols::locks(Workqueue*) | |
43 | { | |
44 | return NULL; | |
45 | } | |
46 | ||
47 | // Run a Read_symbols task. This is where we actually read the | |
48 | // symbols and relocations. | |
49 | ||
50 | void | |
51 | Read_symbols::run(Workqueue* workqueue) | |
52 | { | |
bae7f79e ILT |
53 | Input_file* input_file = new Input_file(this->input_); |
54 | input_file->open(this->options_, this->dirpath_); | |
55 | ||
56 | // Read enough of the file to pick up the entire ELF header. | |
57 | ||
58 | int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
59 | off_t bytes; | |
60 | const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes); | |
61 | if (bytes >= 4) | |
62 | { | |
63 | static unsigned char elfmagic[4] = | |
64 | { | |
65 | elfcpp::ELFMAG0, elfcpp::ELFMAG1, | |
66 | elfcpp::ELFMAG2, elfcpp::ELFMAG3 | |
67 | }; | |
68 | if (memcmp(p, elfmagic, 4) == 0) | |
69 | { | |
70 | // This is an ELF object. | |
71 | Object* obj = make_elf_object(this->input_.name(), input_file, 0, | |
72 | p, bytes); | |
a2fb1b05 | 73 | |
54dc6425 | 74 | this->input_objects_->add_object(obj); |
a2fb1b05 | 75 | |
bae7f79e | 76 | Read_symbols_data sd = obj->read_symbols(); |
14bfc3f5 ILT |
77 | workqueue->queue(new Add_symbols(this->symtab_, obj, sd, |
78 | this->this_blocker_, | |
bae7f79e ILT |
79 | this->next_blocker_)); |
80 | ||
81 | // Opening the file locked it, so now we need to unlock it. | |
82 | input_file->file().unlock(); | |
83 | ||
84 | return; | |
85 | } | |
86 | } | |
87 | ||
88 | // Here we have to handle archives and any other input file | |
89 | // types we need. | |
90 | gold_fatal("only objects are currently supported", false); | |
91 | } | |
92 | ||
93 | // Class Add_symbols. | |
94 | ||
95 | Add_symbols::~Add_symbols() | |
96 | { | |
97 | if (this->this_blocker_ != NULL) | |
98 | delete this->this_blocker_; | |
99 | // next_blocker_ is deleted by the task associated with the next | |
100 | // input file. | |
101 | } | |
102 | ||
a2fb1b05 ILT |
103 | // We are blocked by this_blocker_. We block next_blocker_. We also |
104 | // lock the file. | |
bae7f79e ILT |
105 | |
106 | Task::Is_runnable_type | |
107 | Add_symbols::is_runnable(Workqueue*) | |
108 | { | |
109 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) | |
110 | return IS_BLOCKED; | |
a2fb1b05 ILT |
111 | if (this->object_->is_locked()) |
112 | return IS_LOCKED; | |
bae7f79e ILT |
113 | return IS_RUNNABLE; |
114 | } | |
115 | ||
a2fb1b05 ILT |
116 | class Add_symbols::Add_symbols_locker : public Task_locker |
117 | { | |
118 | public: | |
119 | Add_symbols_locker(Task_token& token, Workqueue* workqueue, | |
120 | Object* object) | |
121 | : blocker_(token, workqueue), objlock_(*object) | |
122 | { } | |
123 | ||
124 | private: | |
125 | Task_locker_block blocker_; | |
126 | Task_locker_obj<Object> objlock_; | |
127 | }; | |
128 | ||
bae7f79e ILT |
129 | Task_locker* |
130 | Add_symbols::locks(Workqueue* workqueue) | |
131 | { | |
a2fb1b05 ILT |
132 | return new Add_symbols_locker(*this->next_blocker_, workqueue, |
133 | this->object_); | |
bae7f79e ILT |
134 | } |
135 | ||
136 | void | |
137 | Add_symbols::run(Workqueue*) | |
138 | { | |
14bfc3f5 | 139 | this->object_->add_symbols(this->symtab_, this->sd_); |
bae7f79e ILT |
140 | } |
141 | ||
142 | } // End namespace gold. |