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61ba1cf9 ILT |
1 | // archive.h -- archive support for gold -*- C++ -*- |
2 | ||
3 | #ifndef GOLD_ARCHIVE_H | |
4 | #define GOLD_ARCHIVE_H | |
5 | ||
6 | #include <string> | |
7 | #include <vector> | |
8 | ||
9 | #include "workqueue.h" | |
10 | ||
11 | namespace gold | |
12 | { | |
13 | ||
14 | class Input_file; | |
15 | class Input_objects; | |
16 | class Symbol_table; | |
17 | ||
18 | // This class represents an archive--generally a libNAME.a file. | |
19 | // Archives have a symbol table and a list of objects. | |
20 | ||
21 | class Archive | |
22 | { | |
23 | public: | |
24 | Archive(const std::string& name, Input_file* input_file) | |
25 | : name_(name), input_file_(input_file), armap_(), extended_names_() | |
26 | { } | |
27 | ||
28 | // The length of the magic string at the start of an archive. | |
29 | static const int sarmag = 8; | |
30 | ||
31 | // The magic string at the start of an archive. | |
32 | static const char armag[sarmag]; | |
33 | ||
34 | // The string expected at the end of an archive member header. | |
35 | static const char arfmag[2]; | |
36 | ||
37 | // The name of the object. | |
38 | const std::string& | |
39 | name() const | |
40 | { return this->name_; } | |
41 | ||
42 | // Set up the archive: read the symbol map. | |
43 | void | |
44 | setup(); | |
45 | ||
46 | // Lock the underlying file. | |
47 | void | |
48 | lock() | |
49 | { this->input_file_->file().lock(); } | |
50 | ||
51 | // Unlock the underlying file. | |
52 | void | |
53 | unlock() | |
54 | { this->input_file_->file().unlock(); } | |
55 | ||
56 | // Return whether the underlying file is locked. | |
57 | bool | |
58 | is_locked() const | |
59 | { return this->input_file_->file().is_locked(); } | |
60 | ||
61 | // Select members from the archive as needed and add them to the | |
62 | // link. | |
63 | void | |
64 | add_symbols(Symbol_table*, Input_objects*); | |
65 | ||
66 | private: | |
67 | Archive(const Archive&); | |
68 | Archive& operator=(const Archive&); | |
69 | ||
70 | struct Archive_header; | |
71 | class Add_archive_symbols_locker; | |
72 | ||
73 | // Get a view into the underlying file. | |
74 | const unsigned char* | |
75 | get_view(off_t start, off_t size); | |
76 | ||
77 | // Read an archive member header at OFF. Return the size of the | |
78 | // member, and set *PNAME to the name. | |
79 | off_t | |
80 | read_header(off_t off, std::string* pname); | |
81 | ||
82 | // Include an archive member in the link. | |
83 | void | |
84 | include_member(Symbol_table*, Input_objects*, off_t off); | |
85 | ||
86 | // An entry in the archive map of symbols to object files. | |
87 | struct Armap_entry | |
88 | { | |
89 | // The symbol name. | |
90 | const char* name; | |
91 | // The offset to the file. | |
92 | off_t offset; | |
93 | }; | |
94 | ||
95 | // Name of object as printed to user. | |
96 | std::string name_; | |
97 | // For reading the file. | |
98 | Input_file* input_file_; | |
99 | // The archive map. | |
100 | std::vector<Armap_entry> armap_; | |
101 | // The extended name table. | |
102 | std::string extended_names_; | |
103 | }; | |
104 | ||
105 | // This class is used to read an archive and pick out the desired | |
106 | // elements and add them to the link. | |
107 | ||
108 | class Add_archive_symbols : public Task | |
109 | { | |
110 | public: | |
111 | Add_archive_symbols(Symbol_table* symtab, Input_objects* input_objects, | |
112 | Archive* archive, Task_token* this_blocker, | |
113 | Task_token* next_blocker) | |
114 | : symtab_(symtab), input_objects_(input_objects), archive_(archive), | |
115 | this_blocker_(this_blocker), next_blocker_(next_blocker) | |
116 | { } | |
117 | ||
118 | ~Add_archive_symbols(); | |
119 | ||
120 | // The standard Task methods. | |
121 | ||
122 | Is_runnable_type | |
123 | is_runnable(Workqueue*); | |
124 | ||
125 | Task_locker* | |
126 | locks(Workqueue*); | |
127 | ||
128 | void | |
129 | run(Workqueue*); | |
130 | ||
131 | private: | |
132 | class Add_archive_symbols_locker; | |
133 | ||
134 | Symbol_table* symtab_; | |
135 | Input_objects* input_objects_; | |
136 | Archive* archive_; | |
137 | Task_token* this_blocker_; | |
138 | Task_token* next_blocker_; | |
139 | }; | |
140 | ||
141 | } // End namespace gold. | |
142 | ||
143 | #endif // !defined(GOLD_ARCHIVE_H) |