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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 | ||
25 | // Return whether a Read_symbols task is runnable. We need write | |
26 | // access to the symbol table. We can read an ordinary input file | |
27 | // immediately. For an archive specified using -l, we have to wait | |
28 | // until the search path is complete. | |
29 | ||
30 | Task::Is_runnable_type | |
31 | Read_symbols::is_runnable(Workqueue*) | |
32 | { | |
33 | if (this->input_.is_lib() && this->dirpath_.token().is_blocked()) | |
34 | return IS_BLOCKED; | |
35 | ||
36 | return IS_RUNNABLE; | |
37 | } | |
38 | ||
39 | // Return a Task_locker for a Read_symbols task. We don't need any | |
40 | // locks here. | |
41 | ||
42 | Task_locker* | |
43 | Read_symbols::locks(Workqueue*) | |
44 | { | |
45 | return NULL; | |
46 | } | |
47 | ||
48 | // Run a Read_symbols task. This is where we actually read the | |
49 | // symbols and relocations. | |
50 | ||
51 | void | |
52 | Read_symbols::run(Workqueue* workqueue) | |
53 | { | |
bae7f79e ILT |
54 | Input_file* input_file = new Input_file(this->input_); |
55 | input_file->open(this->options_, this->dirpath_); | |
56 | ||
57 | // Read enough of the file to pick up the entire ELF header. | |
58 | ||
59 | int ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size; | |
60 | off_t bytes; | |
61 | const unsigned char* p = input_file->file().get_view(0, ehdr_size, &bytes); | |
62 | if (bytes >= 4) | |
63 | { | |
64 | static unsigned char elfmagic[4] = | |
65 | { | |
66 | elfcpp::ELFMAG0, elfcpp::ELFMAG1, | |
67 | elfcpp::ELFMAG2, elfcpp::ELFMAG3 | |
68 | }; | |
69 | if (memcmp(p, elfmagic, 4) == 0) | |
70 | { | |
71 | // This is an ELF object. | |
72 | Object* obj = make_elf_object(this->input_.name(), input_file, 0, | |
73 | p, bytes); | |
a2fb1b05 | 74 | |
54dc6425 | 75 | this->input_objects_->add_object(obj); |
a2fb1b05 | 76 | |
bae7f79e | 77 | Read_symbols_data sd = obj->read_symbols(); |
14bfc3f5 ILT |
78 | workqueue->queue(new Add_symbols(this->symtab_, obj, sd, |
79 | this->this_blocker_, | |
bae7f79e ILT |
80 | this->next_blocker_)); |
81 | ||
82 | // Opening the file locked it, so now we need to unlock it. | |
83 | input_file->file().unlock(); | |
84 | ||
85 | return; | |
86 | } | |
87 | } | |
88 | ||
61ba1cf9 ILT |
89 | if (bytes >= Archive::sarmag) |
90 | { | |
91 | if (memcmp(p, Archive::armag, Archive::sarmag) == 0) | |
92 | { | |
93 | // This is an archive. | |
94 | Archive* arch = new Archive(this->input_.name(), input_file); | |
95 | arch->setup(); | |
96 | workqueue->queue(new Add_archive_symbols(this->symtab_, | |
97 | this->input_objects_, | |
98 | arch, | |
99 | this->this_blocker_, | |
100 | this->next_blocker_)); | |
101 | return; | |
102 | } | |
103 | } | |
104 | ||
bae7f79e ILT |
105 | // Here we have to handle archives and any other input file |
106 | // types we need. | |
61ba1cf9 ILT |
107 | fprintf(stderr, _("%s: %s: not an object or archive\n"), |
108 | program_name, input_file->file().filename().c_str()); | |
109 | gold_exit(false); | |
bae7f79e ILT |
110 | } |
111 | ||
112 | // Class Add_symbols. | |
113 | ||
114 | Add_symbols::~Add_symbols() | |
115 | { | |
116 | if (this->this_blocker_ != NULL) | |
117 | delete this->this_blocker_; | |
118 | // next_blocker_ is deleted by the task associated with the next | |
119 | // input file. | |
120 | } | |
121 | ||
a2fb1b05 ILT |
122 | // We are blocked by this_blocker_. We block next_blocker_. We also |
123 | // lock the file. | |
bae7f79e ILT |
124 | |
125 | Task::Is_runnable_type | |
126 | Add_symbols::is_runnable(Workqueue*) | |
127 | { | |
128 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) | |
129 | return IS_BLOCKED; | |
a2fb1b05 ILT |
130 | if (this->object_->is_locked()) |
131 | return IS_LOCKED; | |
bae7f79e ILT |
132 | return IS_RUNNABLE; |
133 | } | |
134 | ||
a2fb1b05 ILT |
135 | class Add_symbols::Add_symbols_locker : public Task_locker |
136 | { | |
137 | public: | |
138 | Add_symbols_locker(Task_token& token, Workqueue* workqueue, | |
139 | Object* object) | |
140 | : blocker_(token, workqueue), objlock_(*object) | |
141 | { } | |
142 | ||
143 | private: | |
144 | Task_locker_block blocker_; | |
145 | Task_locker_obj<Object> objlock_; | |
146 | }; | |
147 | ||
bae7f79e ILT |
148 | Task_locker* |
149 | Add_symbols::locks(Workqueue* workqueue) | |
150 | { | |
a2fb1b05 ILT |
151 | return new Add_symbols_locker(*this->next_blocker_, workqueue, |
152 | this->object_); | |
bae7f79e ILT |
153 | } |
154 | ||
155 | void | |
156 | Add_symbols::run(Workqueue*) | |
157 | { | |
14bfc3f5 | 158 | this->object_->add_symbols(this->symtab_, this->sd_); |
bae7f79e ILT |
159 | } |
160 | ||
161 | } // End namespace gold. |