Sat, 18 May 2013 20:41:01 -0700
8014262: PrintStringTableStatistics should include more footprint info
Summary: Added info for the string/symbol objects and the hash entries
Reviewed-by: coleenp, rbackman
1 /*
2 * Copyright (c) 1997, 2012, 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.
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23 */
25 #include "precompiled.hpp"
27 #if !defined(_WINDOWS) && !defined(__APPLE__)
29 #include "memory/allocation.inline.hpp"
30 #include "utilities/elfSymbolTable.hpp"
32 ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
33 assert(file, "null file handle");
34 m_symbols = NULL;
35 m_next = NULL;
36 m_file = file;
37 m_status = NullDecoder::no_error;
39 // try to load the string table
40 long cur_offset = ftell(file);
41 if (cur_offset != -1) {
42 // call malloc so we can back up if memory allocation fails.
43 m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal);
44 if (m_symbols) {
45 if (fseek(file, shdr.sh_offset, SEEK_SET) ||
46 fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
47 fseek(file, cur_offset, SEEK_SET)) {
48 m_status = NullDecoder::file_invalid;
49 os::free(m_symbols);
50 m_symbols = NULL;
51 }
52 }
53 if (!NullDecoder::is_error(m_status)) {
54 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
55 }
56 } else {
57 m_status = NullDecoder::file_invalid;
58 }
59 }
61 ElfSymbolTable::~ElfSymbolTable() {
62 if (m_symbols != NULL) {
63 os::free(m_symbols);
64 }
66 if (m_next != NULL) {
67 delete m_next;
68 }
69 }
71 bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) {
72 assert(stringtableIndex, "null string table index pointer");
73 assert(posIndex, "null string table offset pointer");
74 assert(offset, "null offset pointer");
76 if (NullDecoder::is_error(m_status)) {
77 return false;
78 }
80 address pc = 0;
81 size_t sym_size = sizeof(Elf_Sym);
82 assert((m_shdr.sh_size % sym_size) == 0, "check size");
83 int count = m_shdr.sh_size / sym_size;
84 if (m_symbols != NULL) {
85 for (int index = 0; index < count; index ++) {
86 if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
87 address sym_addr = (address)m_symbols[index].st_value;
88 if (sym_addr < addr && (addr - sym_addr) < *offset) {
89 pc = (address)m_symbols[index].st_value;
90 *offset = (int)(addr - pc);
91 *posIndex = m_symbols[index].st_name;
92 *stringtableIndex = m_shdr.sh_link;
93 }
94 }
95 }
96 } else {
97 long cur_pos;
98 if ((cur_pos = ftell(m_file)) == -1 ||
99 fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
100 m_status = NullDecoder::file_invalid;
101 return false;
102 }
104 Elf_Sym sym;
105 for (int index = 0; index < count; index ++) {
106 if (fread(&sym, sym_size, 1, m_file) == 1) {
107 if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
108 address sym_addr = (address)sym.st_value;
109 if (sym_addr < addr && (addr - sym_addr) < *offset) {
110 pc = (address)sym.st_value;
111 *offset = (int)(addr - pc);
112 *posIndex = sym.st_name;
113 *stringtableIndex = m_shdr.sh_link;
114 }
115 }
116 } else {
117 m_status = NullDecoder::file_invalid;
118 return false;
119 }
120 }
121 fseek(m_file, cur_pos, SEEK_SET);
122 }
123 return true;
124 }
126 #endif // _WINDOWS