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annotate src/share/vm/utilities/elfSymbolTable.hpp @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents e7cbc95179c4
children 4ca6dc0799b6
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1 /*
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_UTILITIES_ELF_SYMBOL_TABLE_HPP
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26 #define SHARE_VM_UTILITIES_ELF_SYMBOL_TABLE_HPP
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27
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28 #if !defined(_WINDOWS) && !defined(__APPLE__)
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31 #include "memory/allocation.hpp"
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32 #include "utilities/decoder.hpp"
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33 #include "utilities/elfFile.hpp"
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34
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35 /*
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36 * symbol table object represents a symbol section in an elf file.
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37 * Whenever possible, it will load all symbols from the corresponding section
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38 * of the elf file into memory. Otherwise, it will walk the section in file
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39 * to look up the symbol that nearest the given address.
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40 */
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41 class ElfSymbolTable: public CHeapObj<mtInternal> {
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42 friend class ElfFile;
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43 public:
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44 ElfSymbolTable(FILE* file, Elf_Shdr shdr);
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45 ~ElfSymbolTable();
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46
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47 // search the symbol that is nearest to the specified address.
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48 bool lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable);
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49
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50 NullDecoder::decoder_status get_status() { return m_status; };
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51
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52 protected:
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53 ElfSymbolTable* m_next;
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54
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55 // holds a complete symbol table section if
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56 // can allocate enough memory
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57 Elf_Sym* m_symbols;
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58
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59 // file contains string table
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60 FILE* m_file;
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61
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62 // section header
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63 Elf_Shdr m_shdr;
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64
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65 NullDecoder::decoder_status m_status;
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66 };
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67
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68 #endif // !_WINDOWS and !__APPLE__
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69
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70 #endif // SHARE_VM_UTILITIES_ELF_SYMBOL_TABLE_HPP