Wed, 23 Sep 2020 16:26:20 +0300
8244955: Additional Fix for JDK-8240124
Reviewed-by: mbalao, andrew
1 /*
2 * Copyright (c) 1997, 2014, 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"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/vmSymbols.hpp"
29 void ClassFileStream::truncated_file_error(TRAPS) {
30 THROW_MSG(vmSymbols::java_lang_ClassFormatError(), "Truncated class file");
31 }
33 ClassFileStream::ClassFileStream(u1* buffer, int length, const char* source, bool need_verify) {
34 _buffer_start = buffer;
35 _buffer_end = buffer + length;
36 _current = buffer;
37 _source = source;
38 _need_verify = need_verify;
39 }
41 u1 ClassFileStream::get_u1(TRAPS) {
42 if (_need_verify) {
43 guarantee_more(1, CHECK_0);
44 } else {
45 assert(1 <= _buffer_end - _current, "buffer overflow");
46 }
47 return *_current++;
48 }
50 u2 ClassFileStream::get_u2(TRAPS) {
51 if (_need_verify) {
52 guarantee_more(2, CHECK_0);
53 } else {
54 assert(2 <= _buffer_end - _current, "buffer overflow");
55 }
56 u1* tmp = _current;
57 _current += 2;
58 return Bytes::get_Java_u2(tmp);
59 }
61 u4 ClassFileStream::get_u4(TRAPS) {
62 if (_need_verify) {
63 guarantee_more(4, CHECK_0);
64 } else {
65 assert(4 <= _buffer_end - _current, "buffer overflow");
66 }
67 u1* tmp = _current;
68 _current += 4;
69 return Bytes::get_Java_u4(tmp);
70 }
72 u8 ClassFileStream::get_u8(TRAPS) {
73 if (_need_verify) {
74 guarantee_more(8, CHECK_0);
75 } else {
76 assert(8 <= _buffer_end - _current, "buffer overflow");
77 }
78 u1* tmp = _current;
79 _current += 8;
80 return Bytes::get_Java_u8(tmp);
81 }
83 void ClassFileStream::skip_u1(int length, TRAPS) {
84 if (_need_verify) {
85 guarantee_more(length, CHECK);
86 }
87 _current += length;
88 }
90 void ClassFileStream::skip_u2(int length, TRAPS) {
91 if (_need_verify) {
92 guarantee_more(length * 2, CHECK);
93 }
94 _current += length * 2;
95 }
97 void ClassFileStream::skip_u4(int length, TRAPS) {
98 if (_need_verify) {
99 guarantee_more(length * 4, CHECK);
100 }
101 _current += length * 4;
102 }
104 #if INCLUDE_JFR
106 u1* ClassFileStream::clone_buffer() const {
107 u1* const new_buffer_start = NEW_RESOURCE_ARRAY(u1, length());
108 memcpy(new_buffer_start, _buffer_start, length());
109 return new_buffer_start;
110 }
112 const char* const ClassFileStream::clone_source() const {
113 const char* const src = source();
114 char* source_copy = NULL;
115 if (src != NULL) {
116 size_t source_len = strlen(src);
117 source_copy = NEW_RESOURCE_ARRAY(char, source_len + 1);
118 strncpy(source_copy, src, source_len + 1);
119 }
120 return source_copy;
121 }
123 ClassFileStream* ClassFileStream::clone() const {
124 u1* const new_buffer_start = clone_buffer();
125 return new ClassFileStream(new_buffer_start,
126 length(),
127 clone_source(),
128 need_verify());
129 }
130 #endif // INCLUDE_JFR