bintools/checklib/object/elf_object.cpp
author lorewang
Wed, 01 Dec 2010 16:05:36 +0800
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permissions -rw-r--r--
Specify extenal tool with path
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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include "object.h"
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#include "elf/elf_file_header.h"
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#include "elf/elf_section_header.h"
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#include "elf/elf_symbol.h"
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#include "elf/elf_string_table.h"
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#include <algorithm>
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#include <functional>
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Elf_object::Elf_object(const char* p1, const char* p2)
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{
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    const char* first_p = p1;
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    const char* last_p = p2;
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    elf::File_header fh(first_p, last_p);
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    const char* sh_table_p = first_p + fh.get_shoff();
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    const char* p = sh_table_p;
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    unsigned D = fh.get_shentsize();
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    unsigned N = fh.get_shnum();
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    // Iterate over the section header table.
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    for (unsigned i = 0; i < N; i++, p += D )
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    {
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        elf::Section_header sh(p, last_p);
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        if ( sh.is_type_symtab() ) // We've found the symbol table's section header.
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        {
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            // Locate the string table.
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            elf::Section_header strtab_sh( sh_table_p + D*sh.get_link(), last_p );
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            elf::String_table strtab(first_p + strtab_sh.get_offset(), strtab_sh.get_size() );
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            unsigned D = sh.get_entsize();  // The difference between two symbol pointers.
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            unsigned N = sh.get_size() / D; // The number of symbols.
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            const char* p = first_p + sh.get_offset();
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            // Iterate over all symbols.
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            for (unsigned i = 0; i < N; i++, p += D)
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            {
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                const elf::Symbol s(p);
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                if (s.get_shndx() == 0)
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                {
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                    m_undef_symbols.push_back( strtab.get_string( s.get_name() ) );
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                }
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            }
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            break; // We're only interested in the symbol table ...
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        }
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    }
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}
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Elf_object::~Elf_object() {}
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bool Elf_object::is_undef(const char a_sym[]) const
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{
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    using std::find_if;
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    using std::not1;
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    using std::bind2nd;
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    using std::ptr_fun;
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    using std::strcmp;
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    typedef std::vector<const char*> T;
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    T::const_iterator beg_p = m_undef_symbols.begin();
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    T::const_iterator end_p = m_undef_symbols.end();
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    // "STL considered harmful."
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    T::const_iterator pos = find_if( beg_p, end_p, not1(bind2nd( ptr_fun(strcmp), a_sym)) );
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    return (pos != end_p);
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}
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