// 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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+
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#include "object.h"+
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+
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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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+
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#include <algorithm>+
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#include <functional>+
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+
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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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+
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    elf::File_header fh(first_p, last_p);+
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+
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    const char* sh_table_p = first_p + fh.get_shoff();+
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+
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    const char* p = sh_table_p;+
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+
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    unsigned D = fh.get_shentsize();+
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    unsigned N = fh.get_shnum();+
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+
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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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+
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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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+
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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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+
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            const char* p = first_p + sh.get_offset();+
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+
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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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+
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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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+
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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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+
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Elf_object::~Elf_object() {}+
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+
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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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+
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    typedef std::vector<const char*> T;+
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+
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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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+
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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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+
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    return (pos != end_p);+
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}+
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+
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