| 1 | // target-select.h -- select a target for an object file -*- C++ -*- |
| 2 | |
| 3 | #ifndef GOLD_TARGET_SELECT_H |
| 4 | #define GOLD_TARGET_SELECT_H |
| 5 | |
| 6 | namespace gold |
| 7 | { |
| 8 | |
| 9 | class Target; |
| 10 | |
| 11 | // We want to avoid a master list of targets, which implies using a |
| 12 | // global constructor. And we also want the program to start up as |
| 13 | // quickly as possible, which implies avoiding global constructors. |
| 14 | // We compromise on a very simple global constructor. We use a target |
| 15 | // selector, which specifies an ELF machine number and a recognition |
| 16 | // function. We use global constructors to build a linked list of |
| 17 | // target selectors--a simple pointer list, not a std::list. |
| 18 | |
| 19 | class Target_selector |
| 20 | { |
| 21 | public: |
| 22 | // Create a target selector for a specific machine number, size (32 |
| 23 | // or 64), and endianness. The machine number can be EM_NONE to |
| 24 | // test for any machine number. |
| 25 | Target_selector(int machine, int size, bool big_endian); |
| 26 | |
| 27 | virtual ~Target_selector() |
| 28 | { } |
| 29 | |
| 30 | // If we can handle this target, return a pointer to a target |
| 31 | // structure. The size and endianness are known. |
| 32 | virtual Target* recognize(int machine, int osabi, int abiversion) = 0; |
| 33 | |
| 34 | // Return the next Target_selector in the linked list. |
| 35 | Target_selector* |
| 36 | next() const |
| 37 | { return this->next_; } |
| 38 | |
| 39 | // Return the machine number this selector is looking for, which can |
| 40 | // be EM_NONE to match any machine number. |
| 41 | int |
| 42 | machine() const |
| 43 | { return this->machine_; } |
| 44 | |
| 45 | // Return the size this is looking for (32 or 64). |
| 46 | int |
| 47 | size() const |
| 48 | { return this->size_; } |
| 49 | |
| 50 | // Return the endianness this is looking for. |
| 51 | bool |
| 52 | big_endian() const |
| 53 | { return this->big_endian_; } |
| 54 | |
| 55 | private: |
| 56 | int machine_; |
| 57 | int size_; |
| 58 | bool big_endian_; |
| 59 | Target_selector* next_; |
| 60 | }; |
| 61 | |
| 62 | // Select the target for an ELF file. |
| 63 | |
| 64 | extern Target* select_target(int machine, int size, bool big_endian, |
| 65 | int osabi, int abiversion); |
| 66 | |
| 67 | } // End namespace gold. |
| 68 | |
| 69 | #endif // !defined(GOLD_TARGET_SELECT_H) |