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1 | // target-select.h -- select a target for an object file -*- C++ -*- |
2 | ||
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3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
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23 | #ifndef GOLD_TARGET_SELECT_H |
24 | #define GOLD_TARGET_SELECT_H | |
25 | ||
26 | namespace gold | |
27 | { | |
28 | ||
29 | class Target; | |
30 | ||
31 | // We want to avoid a master list of targets, which implies using a | |
32 | // global constructor. And we also want the program to start up as | |
33 | // quickly as possible, which implies avoiding global constructors. | |
34 | // We compromise on a very simple global constructor. We use a target | |
35 | // selector, which specifies an ELF machine number and a recognition | |
36 | // function. We use global constructors to build a linked list of | |
37 | // target selectors--a simple pointer list, not a std::list. | |
38 | ||
39 | class Target_selector | |
40 | { | |
41 | public: | |
42 | // Create a target selector for a specific machine number, size (32 | |
43 | // or 64), and endianness. The machine number can be EM_NONE to | |
44 | // test for any machine number. | |
6340166c | 45 | Target_selector(int machine, int size, bool is_big_endian); |
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46 | |
47 | virtual ~Target_selector() | |
48 | { } | |
49 | ||
50 | // If we can handle this target, return a pointer to a target | |
51 | // structure. The size and endianness are known. | |
ead1e424 | 52 | virtual Target* recognize(int machine, int osabi, int abiversion) = 0; |
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53 | |
54 | // Return the next Target_selector in the linked list. | |
55 | Target_selector* | |
56 | next() const | |
57 | { return this->next_; } | |
58 | ||
59 | // Return the machine number this selector is looking for, which can | |
60 | // be EM_NONE to match any machine number. | |
61 | int | |
62 | machine() const | |
63 | { return this->machine_; } | |
64 | ||
65 | // Return the size this is looking for (32 or 64). | |
66 | int | |
6340166c | 67 | get_size() const |
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68 | { return this->size_; } |
69 | ||
70 | // Return the endianness this is looking for. | |
71 | bool | |
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72 | is_big_endian() const |
73 | { return this->is_big_endian_; } | |
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74 | |
75 | private: | |
76 | int machine_; | |
77 | int size_; | |
6340166c | 78 | bool is_big_endian_; |
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79 | Target_selector* next_; |
80 | }; | |
81 | ||
82 | // Select the target for an ELF file. | |
83 | ||
84 | extern Target* select_target(int machine, int size, bool big_endian, | |
85 | int osabi, int abiversion); | |
86 | ||
87 | } // End namespace gold. | |
88 | ||
89 | #endif // !defined(GOLD_TARGET_SELECT_H) |