Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/utilities/elfStringTable.cpp
src/share/vm/utilities/elfStringTable.cpp
- changeset 2364
- 2d4762ec74af
- child 2834
- 2a3da7eaf4a6
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| 2314:f95d63e2154a | 2364:2d4762ec74af |
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| 1 /* | |
| 2 * Copyright (c) 1997, 2010, 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 #include "precompiled.hpp" | |
| 26 | |
| 27 #ifndef _WINDOWS | |
| 28 | |
| 29 #include "memory/allocation.inline.hpp" | |
| 30 #include "utilities/elfStringTable.hpp" | |
| 31 | |
| 32 // We will try to load whole string table into memory if we can. | |
| 33 // Otherwise, fallback to more expensive file operation. | |
| 34 ElfStringTable::ElfStringTable(FILE* file, Elf_Shdr shdr, int index) { | |
| 35 assert(file, "null file handle"); | |
| 36 m_table = NULL; | |
| 37 m_index = index; | |
| 38 m_next = NULL; | |
| 39 m_file = file; | |
| 40 m_status = Decoder::no_error; | |
| 41 | |
| 42 // try to load the string table | |
| 43 long cur_offset = ftell(file); | |
| 44 m_table = (char*)NEW_C_HEAP_ARRAY(char, shdr.sh_size); | |
| 45 if (m_table != NULL) { | |
| 46 // if there is an error, mark the error | |
| 47 if (fseek(file, shdr.sh_offset, SEEK_SET) || | |
| 48 fread((void*)m_table, shdr.sh_size, 1, file) != 1 || | |
| 49 fseek(file, cur_offset, SEEK_SET)) { | |
| 50 m_status = Decoder::file_invalid; | |
| 51 FREE_C_HEAP_ARRAY(char, m_table); | |
| 52 m_table = NULL; | |
| 53 } | |
| 54 } else { | |
| 55 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr)); | |
| 56 } | |
| 57 } | |
| 58 | |
| 59 ElfStringTable::~ElfStringTable() { | |
| 60 if (m_table != NULL) { | |
| 61 FREE_C_HEAP_ARRAY(char, m_table); | |
| 62 } | |
| 63 | |
| 64 if (m_next != NULL) { | |
| 65 delete m_next; | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 const char* ElfStringTable::string_at(int pos) { | |
| 70 if (m_status != Decoder::no_error) { | |
| 71 return NULL; | |
| 72 } | |
| 73 if (m_table != NULL) { | |
| 74 return (const char*)(m_table + pos); | |
| 75 } else { | |
| 76 long cur_pos = ftell(m_file); | |
| 77 if (cur_pos == -1 || | |
| 78 fseek(m_file, m_shdr.sh_offset + pos, SEEK_SET) || | |
| 79 fread(m_symbol, 1, MAX_SYMBOL_LEN, m_file) <= 0 || | |
| 80 fseek(m_file, cur_pos, SEEK_SET)) { | |
| 81 m_status = Decoder::file_invalid; | |
| 82 return NULL; | |
| 83 } | |
| 84 return (const char*)m_symbol; | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 #endif // _WINDOWS | |
| 89 |
