| 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 General_options; |
| 15 | class Input_file; |
| 16 | class Input_objects; |
| 17 | class Input_group; |
| 18 | class Layout; |
| 19 | class Symbol_table; |
| 20 | |
| 21 | // This class represents an archive--generally a libNAME.a file. |
| 22 | // Archives have a symbol table and a list of objects. |
| 23 | |
| 24 | class Archive |
| 25 | { |
| 26 | public: |
| 27 | Archive(const std::string& name, Input_file* input_file) |
| 28 | : name_(name), input_file_(input_file), armap_(), extended_names_() |
| 29 | { } |
| 30 | |
| 31 | // The length of the magic string at the start of an archive. |
| 32 | static const int sarmag = 8; |
| 33 | |
| 34 | // The magic string at the start of an archive. |
| 35 | static const char armag[sarmag]; |
| 36 | |
| 37 | // The string expected at the end of an archive member header. |
| 38 | static const char arfmag[2]; |
| 39 | |
| 40 | // The name of the object. |
| 41 | const std::string& |
| 42 | name() const |
| 43 | { return this->name_; } |
| 44 | |
| 45 | // Set up the archive: read the symbol map. |
| 46 | void |
| 47 | setup(); |
| 48 | |
| 49 | // Get a reference to the underlying file. |
| 50 | File_read& |
| 51 | file() |
| 52 | { return this->input_file_->file(); } |
| 53 | |
| 54 | // Lock the underlying file. |
| 55 | void |
| 56 | lock() |
| 57 | { this->input_file_->file().lock(); } |
| 58 | |
| 59 | // Unlock the underlying file. |
| 60 | void |
| 61 | unlock() |
| 62 | { this->input_file_->file().unlock(); } |
| 63 | |
| 64 | // Return whether the underlying file is locked. |
| 65 | bool |
| 66 | is_locked() const |
| 67 | { return this->input_file_->file().is_locked(); } |
| 68 | |
| 69 | // Select members from the archive as needed and add them to the |
| 70 | // link. |
| 71 | void |
| 72 | add_symbols(const General_options&, Symbol_table*, Layout*, Input_objects*); |
| 73 | |
| 74 | private: |
| 75 | Archive(const Archive&); |
| 76 | Archive& operator=(const Archive&); |
| 77 | |
| 78 | struct Archive_header; |
| 79 | |
| 80 | // Get a view into the underlying file. |
| 81 | const unsigned char* |
| 82 | get_view(off_t start, off_t size) |
| 83 | { return this->input_file_->file().get_view(start, size); } |
| 84 | |
| 85 | // Read an archive member header at OFF. Return the size of the |
| 86 | // member, and set *PNAME to the name. |
| 87 | off_t |
| 88 | read_header(off_t off, std::string* pname); |
| 89 | |
| 90 | // Include an archive member in the link. |
| 91 | void |
| 92 | include_member(const General_options&, Symbol_table*, Layout*, |
| 93 | Input_objects*, off_t off); |
| 94 | |
| 95 | // An entry in the archive map of symbols to object files. |
| 96 | struct Armap_entry |
| 97 | { |
| 98 | // The symbol name. |
| 99 | const char* name; |
| 100 | // The offset to the file. |
| 101 | off_t offset; |
| 102 | }; |
| 103 | |
| 104 | // Name of object as printed to user. |
| 105 | std::string name_; |
| 106 | // For reading the file. |
| 107 | Input_file* input_file_; |
| 108 | // The archive map. |
| 109 | std::vector<Armap_entry> armap_; |
| 110 | // The extended name table. |
| 111 | std::string extended_names_; |
| 112 | // Track which symbols in the archive map are for elements which |
| 113 | // have already been included in the link. |
| 114 | std::vector<bool> seen_; |
| 115 | }; |
| 116 | |
| 117 | // This class is used to read an archive and pick out the desired |
| 118 | // elements and add them to the link. |
| 119 | |
| 120 | class Add_archive_symbols : public Task |
| 121 | { |
| 122 | public: |
| 123 | Add_archive_symbols(const General_options& options, Symbol_table* symtab, |
| 124 | Layout* layout, Input_objects* input_objects, |
| 125 | Archive* archive, Input_group* input_group, |
| 126 | Task_token* this_blocker, |
| 127 | Task_token* next_blocker) |
| 128 | : options_(options), symtab_(symtab), layout_(layout), |
| 129 | input_objects_(input_objects), archive_(archive), |
| 130 | input_group_(input_group), this_blocker_(this_blocker), |
| 131 | next_blocker_(next_blocker) |
| 132 | { } |
| 133 | |
| 134 | ~Add_archive_symbols(); |
| 135 | |
| 136 | // The standard Task methods. |
| 137 | |
| 138 | Is_runnable_type |
| 139 | is_runnable(Workqueue*); |
| 140 | |
| 141 | Task_locker* |
| 142 | locks(Workqueue*); |
| 143 | |
| 144 | void |
| 145 | run(Workqueue*); |
| 146 | |
| 147 | private: |
| 148 | class Add_archive_symbols_locker; |
| 149 | |
| 150 | const General_options& options_; |
| 151 | Symbol_table* symtab_; |
| 152 | Layout* layout_; |
| 153 | Input_objects* input_objects_; |
| 154 | Archive* archive_; |
| 155 | Input_group* input_group_; |
| 156 | Task_token* this_blocker_; |
| 157 | Task_token* next_blocker_; |
| 158 | }; |
| 159 | |
| 160 | } // End namespace gold. |
| 161 | |
| 162 | #endif // !defined(GOLD_ARCHIVE_H) |