1 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include "object.h"

    17 

    18 #include "elf/elf_file_header.h"

    19 #include "elf/elf_section_header.h"

    20 #include "elf/elf_symbol.h"

    21 #include "elf/elf_string_table.h"

    22 

    23 #include <algorithm>

    24 #include <functional>

    25 

    26 Elf_object::Elf_object(const char* p1, const char* p2)

    27 {

    28     const char* first_p = p1;

    29     const char* last_p = p2;

    30 

    31     elf::File_header fh(first_p, last_p);

    32 

    33     const char* sh_table_p = first_p + fh.get_shoff();

    34 

    35     const char* p = sh_table_p;

    36 

    37     unsigned D = fh.get_shentsize();

    38     unsigned N = fh.get_shnum();

    39 

    40     // Iterate over the section header table.

    41     for (unsigned i = 0; i < N; i++, p += D )

    42     {

    43         elf::Section_header sh(p, last_p);

    44 

    45         if ( sh.is_type_symtab() ) // We've found the symbol table's section header.

    46         {

    47             // Locate the string table.

    48             elf::Section_header strtab_sh( sh_table_p + D*sh.get_link(), last_p );

    49             elf::String_table strtab(first_p + strtab_sh.get_offset(), strtab_sh.get_size() );

    50 

    51             unsigned D = sh.get_entsize();  // The difference between two symbol pointers.

    52             unsigned N = sh.get_size() / D; // The number of symbols.

    53 

    54             const char* p = first_p + sh.get_offset();

    55 

    56             // Iterate over all symbols.

    57             for (unsigned i = 0; i < N; i++, p += D)

    58             {

    59                 const elf::Symbol s(p);

    60 

    61                 if (s.get_shndx() == 0)

    62                 {

    63                     m_undef_symbols.push_back( strtab.get_string( s.get_name() ) );

    64                 }

    65             }

    66 

    67             break; // We're only interested in the symbol table ...

    68         }

    69     }

    70 }

    71 

    72 Elf_object::~Elf_object() {}

    73 

    74 bool Elf_object::is_undef(const char a_sym[]) const

    75 {

    76     using std::find_if;

    77     using std::not1;

    78     using std::bind2nd;

    79     using std::ptr_fun;

    80     using std::strcmp;

    81 

    82     typedef std::vector<const char*> T;

    83 

    84     T::const_iterator beg_p = m_undef_symbols.begin();

    85     T::const_iterator end_p = m_undef_symbols.end();

    86 

    87     // "STL considered harmful."

    88     T::const_iterator pos = find_if( beg_p, end_p, not1(bind2nd( ptr_fun(strcmp), a_sym)) );

    89 

    90     return (pos != end_p);

    91 }

    92