зеркало из https://github.com/mozilla/gecko-dev.git
115 строки
3.7 KiB
C++
115 строки
3.7 KiB
C++
/* -*- Mode: C++ -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is ``elf_symbol_table''
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corp. Portions created by the Initial Developer are
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* Copyright (C) 2001 the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Chris Waterson <waterson@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef elf_symbol_table_h__
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#define elf_symbol_table_h__
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/*
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Utility class for reading ELF symbol tables.
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*/
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#include <elf.h>
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#include <sys/mman.h>
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#include "interval_map.h"
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class elf_symbol_table {
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protected:
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int m_fd;
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void *m_mapping;
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size_t m_size;
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const char *m_strtab;
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const Elf32_Sym *m_symbols;
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int m_nsymbols;
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int m_text_shndx;
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typedef interval_map<unsigned int, const Elf32_Sym *> rsymtab_t;
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rsymtab_t m_rsymtab;
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int verify_elf_header(const Elf32_Ehdr *hdr);
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int finish();
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public:
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elf_symbol_table()
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: m_fd(-1),
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m_mapping(MAP_FAILED),
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m_size(0),
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m_strtab(0),
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m_symbols(0),
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m_nsymbols(0),
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m_text_shndx(0) {}
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~elf_symbol_table() { finish(); }
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/**
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* Read the symbol table information from the specified file. (This will
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* memory-map the file.)
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*
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* Currently, only symbols from the `.text' section are loaded.
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*/
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int init(const char *file);
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/**
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* Determine what symbol the specified image address corresponds
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* to. Addresses need not refer to a symbol's start address:
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* symbol size information is used to reverse-map the address.
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*/
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const Elf32_Sym *lookup(unsigned int addr) const;
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/**
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* Determine the symbol name for the specified symbol.
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*/
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const char *get_symbol_name(const Elf32_Sym *sym) const;
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/**
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* Return `true' if the specified symbol is a function.
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*/
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bool is_function(const Elf32_Sym *sym) const {
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return (sym->st_size > 0) &&
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(ELF32_ST_TYPE(sym->st_info) == STT_FUNC) &&
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(sym->st_shndx == m_text_shndx); }
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typedef const Elf32_Sym *const_iterator;
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const_iterator begin() const { return const_iterator(m_symbols); }
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const_iterator end() const { return const_iterator(m_symbols + m_nsymbols); }
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};
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#endif // elf_symbol_table_h__
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