Mercurial > hg > graal-jvmci-8
annotate src/share/vm/classfile/sharedPathsMiscInfo.hpp @ 24218:719853999215 jvmci-0.32
Merge with jdk8u141-b15
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 14 Aug 2017 23:20:38 +0200 |
parents | f46ffa934a46 |
children |
rev | line source |
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20375 | 1 /* |
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f46ffa934a46
8143963: improve ClassLoader::trace_class_path to accept an additional outputStream* arg
ccheung
parents:
20376
diff
changeset
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2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. |
20375 | 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 #ifndef SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP | |
26 #define SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP | |
27 | |
28 #include "runtime/os.hpp" | |
29 | |
30 // During dumping time, when processing class paths, we build up the dump-time | |
31 // classpath. The JAR files that exist are stored in the list ClassLoader::_first_entry. | |
32 // However, we need to store other "misc" information for run-time checking, such as | |
33 // | |
34 // + The values of Arguments::get_sysclasspath() used during dumping. | |
35 // | |
36 // + The meta-index file(s) used during dumping (incl modification time and size) | |
37 // | |
38 // + The class path elements specified during dumping but did not exist -- | |
39 // these elements must also be specified at run time, and they also must not | |
40 // exist at run time. | |
41 // | |
42 // These misc items are stored in a linear buffer in SharedPathsMiscInfo. | |
43 // The storage format is stream oriented to minimize its size. | |
44 // | |
45 // When writing the information to the archive file, SharedPathsMiscInfo is stored in | |
46 // the archive file header. At run-time, this information is used only during initialization | |
47 // (accessed using read() instead of mmap()), and is deallocated afterwards to save space. | |
48 // | |
49 // The SharedPathsMiscInfo class is used for both creating the the information (during | |
50 // dumping time) and validation (at run time). Different constructors are used in the | |
51 // two situations. See below. | |
52 | |
53 class SharedPathsMiscInfo : public CHeapObj<mtClass> { | |
54 protected: | |
55 char* _buf_start; | |
56 char* _cur_ptr; | |
57 char* _end_ptr; | |
58 int _buf_size; | |
59 bool _allocated; // was _buf_start allocated by me? | |
60 void ensure_size(size_t needed_bytes); | |
61 void add_path(const char* path, int type); | |
62 | |
63 void write(const void* ptr, size_t size); | |
64 bool read(void* ptr, size_t size); | |
65 | |
66 static void trace_class_path(const char* msg, const char* name = NULL) { | |
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f46ffa934a46
8143963: improve ClassLoader::trace_class_path to accept an additional outputStream* arg
ccheung
parents:
20376
diff
changeset
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67 ClassLoader::trace_class_path(tty, msg, name); |
20375 | 68 } |
69 protected: | |
70 static bool fail(const char* msg, const char* name = NULL); | |
71 virtual bool check(jint type, const char* path); | |
72 | |
73 public: | |
74 enum { | |
75 INITIAL_BUF_SIZE = 128 | |
76 }; | |
77 // This constructor is used when creating the misc information (during dump) | |
78 SharedPathsMiscInfo() { | |
79 _buf_size = INITIAL_BUF_SIZE; | |
80 _cur_ptr = _buf_start = NEW_C_HEAP_ARRAY(char, _buf_size, mtClass); | |
81 _allocated = true; | |
82 } | |
83 // This constructor is used when validating the misc info (during run time) | |
84 SharedPathsMiscInfo(char *buff, int size) { | |
85 _cur_ptr = _buf_start = buff; | |
86 _end_ptr = _buf_start + size; | |
87 _buf_size = size; | |
88 _allocated = false; | |
89 } | |
90 ~SharedPathsMiscInfo() { | |
91 if (_allocated) { | |
92 FREE_C_HEAP_ARRAY(char, _buf_start, mtClass); | |
93 } | |
94 } | |
95 int get_used_bytes() { | |
96 return _cur_ptr - _buf_start; | |
97 } | |
98 void* buffer() { | |
99 return _buf_start; | |
100 } | |
101 | |
102 // writing -- | |
103 | |
104 // The path must not exist at run-time | |
105 void add_nonexist_path(const char* path) { | |
106 add_path(path, NON_EXIST); | |
107 } | |
108 | |
109 // The path must exist and have required size and modification time | |
110 void add_required_file(const char* path) { | |
111 add_path(path, REQUIRED); | |
112 | |
113 struct stat st; | |
114 if (os::stat(path, &st) != 0) { | |
115 assert(0, "sanity"); | |
116 ClassLoader::exit_with_path_failure("failed to os::stat(%s)", path); // should not happen | |
117 } | |
118 write_time(st.st_mtime); | |
119 write_long(st.st_size); | |
120 } | |
121 | |
122 // The path must exist, and must contain exactly <num_entries> files/dirs | |
123 void add_boot_classpath(const char* path) { | |
124 add_path(path, BOOT); | |
125 } | |
126 int write_jint(jint num) { | |
127 write(&num, sizeof(num)); | |
128 return 0; | |
129 } | |
130 void write_time(time_t t) { | |
131 write(&t, sizeof(t)); | |
132 } | |
133 void write_long(long l) { | |
134 write(&l, sizeof(l)); | |
135 } | |
136 | |
137 bool dump_to_file(int fd) { | |
138 int n = get_used_bytes(); | |
139 return (os::write(fd, _buf_start, n) == (size_t)n); | |
140 } | |
141 | |
142 // reading -- | |
143 | |
144 enum { | |
145 BOOT = 1, | |
146 NON_EXIST = 2, | |
147 REQUIRED = 3 | |
148 }; | |
149 | |
150 virtual const char* type_name(int type) { | |
151 switch (type) { | |
152 case BOOT: return "BOOT"; | |
153 case NON_EXIST: return "NON_EXIST"; | |
154 case REQUIRED: return "REQUIRED"; | |
155 default: ShouldNotReachHere(); return "?"; | |
156 } | |
157 } | |
158 | |
159 virtual void print_path(outputStream* out, int type, const char* path) { | |
160 switch (type) { | |
161 case BOOT: | |
162 out->print("Expecting -Dsun.boot.class.path=%s", path); | |
163 break; | |
164 case NON_EXIST: | |
165 out->print("Expecting that %s does not exist", path); | |
166 break; | |
167 case REQUIRED: | |
20376 | 168 out->print("Expecting that file %s must exist and is not altered", path); |
20375 | 169 break; |
170 default: | |
171 ShouldNotReachHere(); | |
172 } | |
173 } | |
174 | |
175 bool check(); | |
176 bool read_jint(jint *ptr) { | |
177 return read(ptr, sizeof(jint)); | |
178 } | |
179 bool read_long(long *ptr) { | |
180 return read(ptr, sizeof(long)); | |
181 } | |
182 bool read_time(time_t *ptr) { | |
183 return read(ptr, sizeof(time_t)); | |
184 } | |
185 }; | |
186 | |
187 #endif // SHARE_VM_CLASSFILE_SHAREDPATHSMISCINFO_HPP |