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annotate src/share/vm/utilities/elfStringTable.cpp @ 3302:2a3da7eaf4a6

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7036747: 7017009 reappeared, problem with ElfStringTable Summary: Created new "new" operator for CHeapObj that allows malloc to fail without causing fatal error. Also replaced "HeapAllocate" with "os::malloc" in decoder code to allow decoder to handle low memory scenario. Reviewed-by: coleenp, dholmes
author zgu
date Wed, 27 Apr 2011 09:09:57 -0400
parents 2d4762ec74af
children f08d439fab8c
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1 /*
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2 * Copyright (c) 1997, 2010, 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
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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 #include "precompiled.hpp"
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26
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27 #ifndef _WINDOWS
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28
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29 #include "memory/allocation.inline.hpp"
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30 #include "runtime/os.hpp"
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31 #include "utilities/elfStringTable.hpp"
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32
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33 // We will try to load whole string table into memory if we can.
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34 // Otherwise, fallback to more expensive file operation.
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35 ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) {
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36 assert(file, "null file handle");
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37 m_table = NULL;
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38 m_index = index;
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39 m_next = NULL;
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40 m_file = file;
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41 m_status = Decoder::no_error;
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42
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43 // try to load the string table
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44 long cur_offset = ftell(file);
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45 m_table = (char*)os::malloc(sizeof(char) * shdr.sh_size);
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46 if (m_table != NULL) {
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47 // if there is an error, mark the error
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48 if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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49 fread((void*)m_table, shdr.sh_size, 1, file) != 1 ||
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50 fseek(file, cur_offset, SEEK_SET)) {
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51 m_status = Decoder::file_invalid;
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52 os::free((void*)m_table);
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53 m_table = NULL;
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54 }
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55 } else {
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56 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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57 }
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58 }
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59
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60 ElfStringTable::~ElfStringTable() {
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61 if (m_table != NULL) {
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62 os::free((void*)m_table);
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63 }
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64
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65 if (m_next != NULL) {
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66 delete m_next;
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67 }
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68 }
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69
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70 const char* ElfStringTable::string_at(int pos) {
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71 if (m_status != Decoder::no_error) {
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72 return NULL;
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73 }
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74 if (m_table != NULL) {
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75 return (const char*)(m_table + pos);
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76 } else {
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77 long cur_pos = ftell(m_file);
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78 if (cur_pos == -1 ||
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79 fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) ||
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80 fread(m_symbol, 1, MAX_SYMBOL_LEN, m_file) <= 0 ||
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81 fseek(m_file, cur_pos, SEEK_SET)) {
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82 m_status = Decoder::file_invalid;
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83 return NULL;
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84 }
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85 return (const char*)m_symbol;
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86 }
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87 }
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88
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89 #endif // _WINDOWS
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90