The Tor Browser: tools/reorder/elf_symbol

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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/. */

     6 #ifndef elf_symbol_table_h__

     7 #define elf_symbol_table_h__

     9 /*

    11   Utility class for reading ELF symbol tables.

    13  */

    15 #include <elf.h>

    16 #include <sys/mman.h>

    18 #include "interval_map.h"

    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;

    30     typedef interval_map<unsigned int, const Elf32_Sym *> rsymtab_t;

    31     rsymtab_t        m_rsymtab;

    33     int verify_elf_header(const Elf32_Ehdr *hdr);

    34     int finish();

    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) {}

    46     ~elf_symbol_table() { finish(); }

    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);

    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;

    63     /**

    64      * Determine the symbol name for the specified symbol.

    65      */

    66     const char *get_symbol_name(const Elf32_Sym *sym) const;

    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); }

    76     typedef const Elf32_Sym *const_iterator;

    78     const_iterator begin() const { return const_iterator(m_symbols); }

    79     const_iterator end() const { return const_iterator(m_symbols + m_nsymbols); }

    80 };

    82 #endif // elf_symbol_table_h__

The Tor Browser / file revision