1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_UTILITIES_ELF_SYMBOL_TABLE_HPP
  26 #define SHARE_VM_UTILITIES_ELF_SYMBOL_TABLE_HPP
  27 
  28 #if !defined(_WINDOWS) && !defined(__APPLE__)
  29 
  30 
  31 #include "memory/allocation.hpp"
  32 #include "utilities/decoder.hpp"
  33 #include "utilities/elfFile.hpp"
  34 
  35 /*
  36  * symbol table object represents a symbol section in an elf file.
  37  * Whenever possible, it will load all symbols from the corresponding section
  38  * of the elf file into memory. Otherwise, it will walk the section in file
  39  * to look up the symbol that nearest the given address.
  40  */
  41 class ElfSymbolTable: public CHeapObj<mtInternal> {
  42   friend class ElfFile;
  43  public:
  44   ElfSymbolTable(FILE* file, Elf_Shdr shdr);
  45   ~ElfSymbolTable();
  46 
  47   // search the symbol that is nearest to the specified address.
  48 #if defined(PPC64)
  49   bool lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable);
  50 #else
  51   bool lookup(address addr, int* stringtableIndex, int* posIndex, int* offset);
  52 #endif
  53 
  54   NullDecoder::decoder_status get_status() { return m_status; };
  55 
  56  protected:
  57   ElfSymbolTable*  m_next;
  58 
  59   // holds a complete symbol table section if
  60   // can allocate enough memory
  61   Elf_Sym*            m_symbols;
  62 
  63   // file contains string table
  64   FILE*               m_file;
  65 
  66   // section header
  67   Elf_Shdr            m_shdr;
  68 
  69   NullDecoder::decoder_status  m_status;
  70 };
  71 
  72 #if defined(PPC64)
  73 
  74 class ElfFuncDescTable: public CHeapObj<mtInternal> {
  75   friend class ElfFile;
  76  public:
  77   ElfFuncDescTable(FILE* file, Elf_Shdr shdr);
  78   ~ElfFuncDescTable();
  79 
  80   // return the function address for the function descriptor at 'index' or NULL on error
  81   address lookup(Elf_Word index);
  82 
  83   NullDecoder::decoder_status get_status() { return m_status; };
  84 
  85  protected:
  86   // holds the complete function descriptor section if
  87   // we can allocate enough memory
  88   address*            m_funcDescs;
  89 
  90   // file contains string table
  91   FILE*               m_file;
  92 
  93   // section header
  94   Elf_Shdr            m_shdr;
  95 
  96   NullDecoder::decoder_status  m_status;
  97 };
  98 
  99 #endif
 100 
 101 #endif // _WINDOWS and _APPLE
 102 
 103 #endif // SHARE_VM_UTILITIES_ELF_SYMBOL_TABLE_HPP