Mercurial > hg > truffle
annotate src/share/vm/utilities/elfFuncDescTable.cpp @ 21183:565d7dbae77c
LIRGenerator: replace doBlockStart/doBlockEnd with an AutoCloseable.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Mon, 20 Apr 2015 11:16:15 +0200 |
parents | e7cbc95179c4 |
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rev | line source |
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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 * Copyright 2012, 2013 SAP AG. All rights reserved. |
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * |
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6 * This code is free software; you can redistribute it and/or modify it |
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7 * under the terms of the GNU General Public License version 2 only, as |
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8 * published by the Free Software Foundation. |
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9 * |
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10 * This code is distributed in the hope that it will be useful, but WITHOUT |
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 * version 2 for more details (a copy is included in the LICENSE file that |
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14 * accompanied this code). |
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15 * |
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16 * You should have received a copy of the GNU General Public License version |
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17 * 2 along with this work; if not, write to the Free Software Foundation, |
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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19 * |
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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21 * or visit www.oracle.com if you need additional information or have any |
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22 * questions. |
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23 * |
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24 */ |
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25 |
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26 #include "precompiled.hpp" |
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27 |
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28 #if !defined(_WINDOWS) && !defined(__APPLE__) |
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29 |
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30 #include "memory/allocation.inline.hpp" |
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31 #include "utilities/elfFuncDescTable.hpp" |
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32 |
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33 ElfFuncDescTable::ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index) { |
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34 assert(file, "null file handle"); |
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35 // The actual function address (i.e. function entry point) is always the |
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36 // first value in the function descriptor (on IA64 and PPC64 they look as follows): |
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37 // PPC64: [function entry point, TOC pointer, environment pointer] |
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38 // IA64 : [function entry point, GP (global pointer) value] |
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39 // Unfortunately 'shdr.sh_entsize' doesn't always seem to contain this size (it's zero on PPC64) so we can't assert |
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40 // assert(IA64_ONLY(2) PPC64_ONLY(3) * sizeof(address) == shdr.sh_entsize, "Size mismatch for '.opd' section entries"); |
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41 |
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42 m_funcDescs = NULL; |
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43 m_file = file; |
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44 m_index = index; |
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45 m_status = NullDecoder::no_error; |
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46 |
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47 // try to load the function descriptor table |
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48 long cur_offset = ftell(file); |
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49 if (cur_offset != -1) { |
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50 // call malloc so we can back up if memory allocation fails. |
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51 m_funcDescs = (address*)os::malloc(shdr.sh_size, mtInternal); |
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52 if (m_funcDescs) { |
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53 if (fseek(file, shdr.sh_offset, SEEK_SET) || |
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54 fread((void*)m_funcDescs, shdr.sh_size, 1, file) != 1 || |
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55 fseek(file, cur_offset, SEEK_SET)) { |
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56 m_status = NullDecoder::file_invalid; |
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57 os::free(m_funcDescs); |
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58 m_funcDescs = NULL; |
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59 } |
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60 } |
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61 if (!NullDecoder::is_error(m_status)) { |
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62 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr)); |
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63 } |
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64 } else { |
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65 m_status = NullDecoder::file_invalid; |
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66 } |
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67 } |
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68 |
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69 ElfFuncDescTable::~ElfFuncDescTable() { |
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70 if (m_funcDescs != NULL) { |
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71 os::free(m_funcDescs); |
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72 } |
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73 } |
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74 |
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75 address ElfFuncDescTable::lookup(Elf_Word index) { |
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76 if (NullDecoder::is_error(m_status)) { |
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77 return NULL; |
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78 } |
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79 |
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80 if (m_funcDescs != NULL) { |
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81 if (m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size) { |
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82 // Notice that 'index' is a byte-offset into the function descriptor table. |
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83 return m_funcDescs[(index - m_shdr.sh_addr) / sizeof(address)]; |
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84 } |
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85 return NULL; |
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86 } else { |
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87 long cur_pos; |
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88 address addr; |
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89 if (!(m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size)) { |
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90 // don't put the whole decoder in error mode if we just tried a wrong index |
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91 return NULL; |
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92 } |
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93 if ((cur_pos = ftell(m_file)) == -1 || |
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94 fseek(m_file, m_shdr.sh_offset + index - m_shdr.sh_addr, SEEK_SET) || |
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95 fread(&addr, sizeof(addr), 1, m_file) != 1 || |
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96 fseek(m_file, cur_pos, SEEK_SET)) { |
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97 m_status = NullDecoder::file_invalid; |
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98 return NULL; |
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99 } |
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100 return addr; |
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101 } |
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102 } |
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103 |
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104 #endif // !_WINDOWS && !__APPLE__ |