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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" | |
10 | #include "readsyms.h" | |
11 | ||
12 | namespace gold | |
13 | { | |
14 | ||
15 | // Class read_symbols. | |
16 | ||
17 | Read_symbols::~Read_symbols() | |
18 | { | |
19 | // The this_blocker_ and next_blocker_ pointers are passed on to the | |
20 | // Add_symbols task. | |
21 | } | |
22 | ||
23 | // Return whether a Read_symbols task is runnable. We need write | |
24 | // access to the symbol table. We can read an ordinary input file | |
25 | // immediately. For an archive specified using -l, we have to wait | |
26 | // until the search path is complete. | |
27 | ||
28 | Task::Is_runnable_type | |
29 | Read_symbols::is_runnable(Workqueue*) | |
30 | { | |
31 | if (this->input_.is_lib() && this->dirpath_.token().is_blocked()) | |
32 | return IS_BLOCKED; | |
33 | ||
34 | return IS_RUNNABLE; | |
35 | } | |
36 | ||
37 | // Return a Task_locker for a Read_symbols task. We don't need any | |
38 | // locks here. | |
39 | ||
40 | Task_locker* | |
41 | Read_symbols::locks(Workqueue*) | |
42 | { | |
43 | return NULL; | |
44 | } | |
45 | ||
46 | // Run a Read_symbols task. This is where we actually read the | |
47 | // symbols and relocations. | |
48 | ||
49 | void | |
50 | Read_symbols::run(Workqueue* workqueue) | |
51 | { | |
52 | // We don't keep track of Input_file objects, so this is a memory | |
53 | // leak. | |
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); | |
74 | ||
75 | Read_symbols_data sd = obj->read_symbols(); | |
76 | workqueue->queue(new Add_symbols(obj, sd, this->this_blocker_, | |
77 | this->next_blocker_)); | |
78 | ||
79 | // Opening the file locked it, so now we need to unlock it. | |
80 | input_file->file().unlock(); | |
81 | ||
82 | return; | |
83 | } | |
84 | } | |
85 | ||
86 | // Here we have to handle archives and any other input file | |
87 | // types we need. | |
88 | gold_fatal("only objects are currently supported", false); | |
89 | } | |
90 | ||
91 | // Class Add_symbols. | |
92 | ||
93 | Add_symbols::~Add_symbols() | |
94 | { | |
95 | if (this->this_blocker_ != NULL) | |
96 | delete this->this_blocker_; | |
97 | // next_blocker_ is deleted by the task associated with the next | |
98 | // input file. | |
99 | } | |
100 | ||
101 | // We are blocked by this_blocker_. We block next_blocker_. | |
102 | ||
103 | Task::Is_runnable_type | |
104 | Add_symbols::is_runnable(Workqueue*) | |
105 | { | |
106 | if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) | |
107 | return IS_BLOCKED; | |
108 | return IS_RUNNABLE; | |
109 | } | |
110 | ||
111 | Task_locker* | |
112 | Add_symbols::locks(Workqueue* workqueue) | |
113 | { | |
114 | return new Task_locker_block(*this->next_blocker_, workqueue); | |
115 | } | |
116 | ||
117 | void | |
118 | Add_symbols::run(Workqueue*) | |
119 | { | |
120 | this->object_->add_symbols(this->sd_); | |
121 | } | |
122 | ||
123 | } // End namespace gold. |