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1 // Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // |
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15 |
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16 #include "object.h" |
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17 |
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18 #include "elf/elf_file_header.h" |
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19 #include "elf/elf_section_header.h" |
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20 #include "elf/elf_symbol.h" |
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21 #include "elf/elf_string_table.h" |
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22 |
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23 #include <algorithm> |
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24 #include <functional> |
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25 #include <cstring> |
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26 |
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27 Elf_object::Elf_object(const char* p1, const char* p2) |
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28 { |
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29 const char* first_p = p1; |
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30 const char* last_p = p2; |
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31 |
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32 elf::File_header fh(first_p, last_p); |
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33 |
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34 const char* sh_table_p = first_p + fh.get_shoff(); |
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35 |
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36 const char* p = sh_table_p; |
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37 |
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38 unsigned D = fh.get_shentsize(); |
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39 unsigned N = fh.get_shnum(); |
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40 |
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41 // Iterate over the section header table. |
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42 for (unsigned i = 0; i < N; i++, p += D ) |
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43 { |
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44 elf::Section_header sh(p, last_p); |
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45 |
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46 if ( sh.is_type_symtab() ) // We've found the symbol table's section header. |
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47 { |
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48 // Locate the string table. |
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49 elf::Section_header strtab_sh( sh_table_p + D*sh.get_link(), last_p ); |
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50 elf::String_table strtab(first_p + strtab_sh.get_offset(), strtab_sh.get_size() ); |
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51 |
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52 unsigned D = sh.get_entsize(); // The difference between two symbol pointers. |
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53 unsigned N = sh.get_size() / D; // The number of symbols. |
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54 |
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55 const char* p = first_p + sh.get_offset(); |
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56 |
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57 // Iterate over all symbols. |
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58 for (unsigned i = 0; i < N; i++, p += D) |
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59 { |
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60 const elf::Symbol s(p); |
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61 |
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62 if (s.get_shndx() == 0) |
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63 { |
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64 m_undef_symbols.push_back( strtab.get_string( s.get_name() ) ); |
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65 } |
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66 } |
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67 |
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68 break; // We're only interested in the symbol table ... |
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69 } |
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70 } |
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71 } |
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72 |
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73 Elf_object::~Elf_object() {} |
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74 |
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75 bool Elf_object::is_undef(const char a_sym[]) const |
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76 { |
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77 using std::find_if; |
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78 using std::not1; |
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79 using std::bind2nd; |
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80 using std::ptr_fun; |
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81 using std::strcmp; |
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82 |
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83 typedef std::vector<const char*> T; |
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84 |
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85 T::const_iterator beg_p = m_undef_symbols.begin(); |
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86 T::const_iterator end_p = m_undef_symbols.end(); |
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87 |
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88 // "STL considered harmful." |
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89 T::const_iterator pos = find_if( beg_p, end_p, not1(bind2nd( ptr_fun(strcmp), a_sym)) ); |
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90 |
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91 return (pos != end_p); |
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92 } |
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93 |