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comparison src/share/vm/classfile/sharedPathsMiscInfo.cpp @ 20375:6e0cb14ce59b

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8046070: Class Data Sharing clean up and refactoring Summary: Cleaned up CDS to be more configurable, maintainable and extensible Reviewed-by: dholmes, coleenp, acorn, mchung
author iklam
date Thu, 21 Aug 2014 13:57:51 -0700
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children bb239308be67
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20374:999824269b71 20375:6e0cb14ce59b
1 /*
2 * Copyright (c) 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.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/classLoaderData.inline.hpp"
28 #include "classfile/sharedPathsMiscInfo.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "memory/metaspaceShared.hpp"
31 #include "runtime/arguments.hpp"
32
33 void SharedPathsMiscInfo::add_path(const char* path, int type) {
34 if (TraceClassPaths) {
35 tty->print("[type=%s] ", type_name(type));
36 trace_class_path("[Add misc shared path ", path);
37 }
38 write(path, strlen(path) + 1);
39 write_jint(jint(type));
40 }
41
42 void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) {
43 assert(_allocated, "cannot modify buffer during validation.");
44 int used = get_used_bytes();
45 int target = used + int(needed_bytes);
46 if (target > _buf_size) {
47 _buf_size = _buf_size * 2 + (int)needed_bytes;
48 _buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass);
49 _cur_ptr = _buf_start + used;
50 _end_ptr = _buf_start + _buf_size;
51 }
52 }
53
54 void SharedPathsMiscInfo::write(const void* ptr, size_t size) {
55 ensure_size(size);
56 memcpy(_cur_ptr, ptr, size);
57 _cur_ptr += size;
58 }
59
60 bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
61 if (_cur_ptr + size <= _end_ptr) {
62 memcpy(ptr, _cur_ptr, size);
63 _cur_ptr += size;
64 return true;
65 }
66 return false;
67 }
68
69 bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
70 ClassLoader::trace_class_path(msg, name);
71 MetaspaceShared::set_archive_loading_failed();
72 return false;
73 }
74
75 bool SharedPathsMiscInfo::check() {
76 // The whole buffer must be 0 terminated so that we can use strlen and strcmp
77 // without fear.
78 _end_ptr -= sizeof(jint);
79 if (_cur_ptr >= _end_ptr) {
80 return fail("Truncated archive file header");
81 }
82 if (*_end_ptr != 0) {
83 return fail("Corrupted archive file header");
84 }
85
86 while (_cur_ptr < _end_ptr) {
87 jint type;
88 const char* path = _cur_ptr;
89 _cur_ptr += strlen(path) + 1;
90 if (!read_jint(&type)) {
91 return fail("Corrupted archive file header");
92 }
93 if (TraceClassPaths) {
94 tty->print("[type=%s ", type_name(type));
95 print_path(tty, type, path);
96 tty->print_cr("]");
97 }
98 if (!check(type, path)) {
99 if (!PrintSharedArchiveAndExit) {
100 return false;
101 }
102 } else {
103 trace_class_path("[ok");
104 }
105 }
106
107 return true;
108 }
109
110 bool SharedPathsMiscInfo::check(jint type, const char* path) {
111 switch (type) {
112 case BOOT:
113 if (strcmp(path, Arguments::get_sysclasspath()) != 0) {
114 return fail("[BOOT classpath mismatch, actual: -Dsun.boot.class.path=", Arguments::get_sysclasspath());
115 }
116 break;
117 case NON_EXIST: // fall-through
118 case REQUIRED:
119 {
120 struct stat st;
121 if (os::stat(path, &st) != 0) {
122 // The file does not actually exist
123 if (type == REQUIRED) {
124 // but we require it to exist -> fail
125 return fail("Required file doesn't exist");
126 }
127 } else {
128 // The file actually exists
129 if (type == NON_EXIST) {
130 // But we want it to not exist -> fail
131 return fail("File must not exist");
132 }
133 time_t timestamp;
134 long filesize;
135
136 if (!read_time(&timestamp) || !read_long(&filesize)) {
137 return fail("Corrupted archive file header");
138 }
139 if (timestamp != st.st_mtime) {
140 return fail("Timestamp mismatch");
141 }
142 if (filesize != st.st_size) {
143 return fail("File size mismatch");
144 }
145 }
146 }
147 break;
148
149 default:
150 return fail("Corrupted archive file header");
151 }
152
153 return true;
154 }