gecko/tools/reorder/elf_symbol_table.h

115 lines
3.7 KiB
C++

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