The Tor Browser / file comparison
comparison: tools/reorder/elf_symbol_table.h
tools/reorder/elf_symbol_table.h
- branch
- TOR_BUG_9701
- changeset 3
- 141e0f1194b1
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| -1:000000000000 | 0:8fd7d01f4a72 |
|---|---|
| 1 /* -*- Mode: C++ -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef elf_symbol_table_h__ | |
| 7 #define elf_symbol_table_h__ | |
| 8 | |
| 9 /* | |
| 10 | |
| 11 Utility class for reading ELF symbol tables. | |
| 12 | |
| 13 */ | |
| 14 | |
| 15 #include <elf.h> | |
| 16 #include <sys/mman.h> | |
| 17 | |
| 18 #include "interval_map.h" | |
| 19 | |
| 20 class elf_symbol_table { | |
| 21 protected: | |
| 22 int m_fd; | |
| 23 void *m_mapping; | |
| 24 size_t m_size; | |
| 25 const char *m_strtab; | |
| 26 const Elf32_Sym *m_symbols; | |
| 27 int m_nsymbols; | |
| 28 int m_text_shndx; | |
| 29 | |
| 30 typedef interval_map<unsigned int, const Elf32_Sym *> rsymtab_t; | |
| 31 rsymtab_t m_rsymtab; | |
| 32 | |
| 33 int verify_elf_header(const Elf32_Ehdr *hdr); | |
| 34 int finish(); | |
| 35 | |
| 36 public: | |
| 37 elf_symbol_table() | |
| 38 : m_fd(-1), | |
| 39 m_mapping(MAP_FAILED), | |
| 40 m_size(0), | |
| 41 m_strtab(0), | |
| 42 m_symbols(0), | |
| 43 m_nsymbols(0), | |
| 44 m_text_shndx(0) {} | |
| 45 | |
| 46 ~elf_symbol_table() { finish(); } | |
| 47 | |
| 48 /** | |
| 49 * Read the symbol table information from the specified file. (This will | |
| 50 * memory-map the file.) | |
| 51 * | |
| 52 * Currently, only symbols from the `.text' section are loaded. | |
| 53 */ | |
| 54 int init(const char *file); | |
| 55 | |
| 56 /** | |
| 57 * Determine what symbol the specified image address corresponds | |
| 58 * to. Addresses need not refer to a symbol's start address: | |
| 59 * symbol size information is used to reverse-map the address. | |
| 60 */ | |
| 61 const Elf32_Sym *lookup(unsigned int addr) const; | |
| 62 | |
| 63 /** | |
| 64 * Determine the symbol name for the specified symbol. | |
| 65 */ | |
| 66 const char *get_symbol_name(const Elf32_Sym *sym) const; | |
| 67 | |
| 68 /** | |
| 69 * Return `true' if the specified symbol is a function. | |
| 70 */ | |
| 71 bool is_function(const Elf32_Sym *sym) const { | |
| 72 return (sym->st_size > 0) && | |
| 73 (ELF32_ST_TYPE(sym->st_info) == STT_FUNC) && | |
| 74 (sym->st_shndx == m_text_shndx); } | |
| 75 | |
| 76 typedef const Elf32_Sym *const_iterator; | |
| 77 | |
| 78 const_iterator begin() const { return const_iterator(m_symbols); } | |
| 79 const_iterator end() const { return const_iterator(m_symbols + m_nsymbols); } | |
| 80 }; | |
| 81 | |
| 82 #endif // elf_symbol_table_h__ |
