Mercurial > hg > truffle
comparison src/share/vm/utilities/elfStringTable.cpp @ 2022:2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
Summary: Implemented in-process C native stack frame decoding when symbols are available.
Reviewed-by: coleenp, never
author | zgu |
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date | Sat, 11 Dec 2010 13:20:56 -0500 |
parents | |
children | 2a3da7eaf4a6 |
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1972:f95d63e2154a | 2022:2d4762ec74af |
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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 |