1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/utilities/elfSymbolTable.cpp Sat Dec 11 13:20:56 2010 -0500
1.3 @@ -0,0 +1,125 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +
1.30 +#ifndef _WINDOWS
1.31 +
1.32 +#include "memory/allocation.inline.hpp"
1.33 +#include "utilities/elfSymbolTable.hpp"
1.34 +
1.35 +ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
1.36 + assert(file, "null file handle");
1.37 + m_symbols = NULL;
1.38 + m_next = NULL;
1.39 + m_file = file;
1.40 + m_status = Decoder::no_error;
1.41 +
1.42 + // try to load the string table
1.43 + long cur_offset = ftell(file);
1.44 + if (cur_offset != -1) {
1.45 + m_symbols = (Elf_Sym*)NEW_C_HEAP_ARRAY(char, shdr.sh_size);
1.46 + if (m_symbols) {
1.47 + if (fseek(file, shdr.sh_offset, SEEK_SET) ||
1.48 + fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
1.49 + fseek(file, cur_offset, SEEK_SET)) {
1.50 + m_status = Decoder::file_invalid;
1.51 + FREE_C_HEAP_ARRAY(char, m_symbols);
1.52 + m_symbols = NULL;
1.53 + }
1.54 + }
1.55 + if (m_status == Decoder::no_error) {
1.56 + memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
1.57 + }
1.58 + } else {
1.59 + m_status = Decoder::file_invalid;
1.60 + }
1.61 +}
1.62 +
1.63 +ElfSymbolTable::~ElfSymbolTable() {
1.64 + if (m_symbols != NULL) {
1.65 + FREE_C_HEAP_ARRAY(char, m_symbols);
1.66 + }
1.67 +
1.68 + if (m_next != NULL) {
1.69 + delete m_next;
1.70 + }
1.71 +}
1.72 +
1.73 +Decoder::decoder_status ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) {
1.74 + assert(stringtableIndex, "null string table index pointer");
1.75 + assert(posIndex, "null string table offset pointer");
1.76 + assert(offset, "null offset pointer");
1.77 +
1.78 + if (m_status != Decoder::no_error) {
1.79 + return m_status;
1.80 + }
1.81 +
1.82 + address pc = 0;
1.83 + size_t sym_size = sizeof(Elf_Sym);
1.84 + assert((m_shdr.sh_size % sym_size) == 0, "check size");
1.85 + int count = m_shdr.sh_size / sym_size;
1.86 + if (m_symbols != NULL) {
1.87 + for (int index = 0; index < count; index ++) {
1.88 + if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
1.89 + address sym_addr = (address)m_symbols[index].st_value;
1.90 + if (sym_addr < addr && (addr - sym_addr) < *offset) {
1.91 + pc = (address)m_symbols[index].st_value;
1.92 + *offset = (int)(addr - pc);
1.93 + *posIndex = m_symbols[index].st_name;
1.94 + *stringtableIndex = m_shdr.sh_link;
1.95 + }
1.96 + }
1.97 + }
1.98 + } else {
1.99 + long cur_pos;
1.100 + if ((cur_pos = ftell(m_file)) == -1 ||
1.101 + fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
1.102 + m_status = Decoder::file_invalid;
1.103 + return m_status;
1.104 + }
1.105 +
1.106 + Elf_Sym sym;
1.107 + for (int index = 0; index < count; index ++) {
1.108 + if (fread(&sym, sym_size, 1, m_file) == 1) {
1.109 + if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
1.110 + address sym_addr = (address)sym.st_value;
1.111 + if (sym_addr < addr && (addr - sym_addr) < *offset) {
1.112 + pc = (address)sym.st_value;
1.113 + *offset = (int)(addr - pc);
1.114 + *posIndex = sym.st_name;
1.115 + *stringtableIndex = m_shdr.sh_link;
1.116 + }
1.117 + }
1.118 + } else {
1.119 + m_status = Decoder::file_invalid;
1.120 + return m_status;
1.121 + }
1.122 + }
1.123 + fseek(m_file, cur_pos, SEEK_SET);
1.124 + }
1.125 + return m_status;
1.126 +}
1.127 +
1.128 +#endif // _WINDOWS
