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3151305a ILT |
1 | // ehframe.h -- handle exception frame sections for gold -*- C++ -*- |
2 | ||
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 | ||
23 | #ifndef GOLD_EHFRAME_H | |
24 | #define GOLD_EHFRAME_H | |
25 | ||
26 | #include "output.h" | |
27 | ||
28 | namespace gold | |
29 | { | |
30 | ||
31 | // This class manages the .eh_frame_hdr section, which holds the data | |
32 | // for the PT_GNU_EH_FRAME segment. gcc's unwind support code uses | |
33 | // the PT_GNU_EH_FRAME segment to find the list of FDEs. This saves | |
34 | // the time required to register the exception handlers at startup | |
35 | // time and when a shared object is loaded, and the time required to | |
36 | // deregister the exception handlers when a shared object is unloaded. | |
37 | ||
38 | // FIXME: gcc supports using storing a sorted lookup table for the | |
39 | // FDEs in the PT_GNU_EH_FRAME segment, but we do not yet generate | |
40 | // that. | |
41 | ||
42 | class Eh_frame_hdr : public Output_section_data | |
43 | { | |
44 | public: | |
9025d29d | 45 | Eh_frame_hdr(Output_section* eh_frame_section); |
3151305a ILT |
46 | |
47 | // Set the final data size. | |
48 | void | |
49 | do_set_address(uint64_t address, off_t offset); | |
50 | ||
51 | // Write the data to the file. | |
52 | void | |
53 | do_write(Output_file*); | |
54 | ||
55 | private: | |
3151305a ILT |
56 | // The .eh_frame section. |
57 | Output_section* eh_frame_section_; | |
58 | }; | |
59 | ||
60 | } // End namespace gold. | |
61 | ||
62 | #endif // !defined(GOLD_EHFRAME_H) |