Mercurial > hg > truffle
annotate src/share/vm/memory/filemap.cpp @ 20430:119875f0fc67
8056964: JDK-8055286 changes are incomplete.
Summary: added ccstr and ccstrlist types to compilerOracle 'option' command
Reviewed-by: roland
author | kvn |
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date | Tue, 02 Sep 2014 10:26:48 -0700 |
parents | 6e0cb14ce59b |
children | 8cb56c8cb30d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
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27 #include "classfile/sharedClassUtil.hpp" |
1972 | 28 #include "classfile/symbolTable.hpp" |
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29 #include "classfile/systemDictionaryShared.hpp" |
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30 #include "classfile/altHashing.hpp" |
1972 | 31 #include "memory/filemap.hpp" |
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32 #include "memory/metadataFactory.hpp" |
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33 #include "memory/oopFactory.hpp" |
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34 #include "oops/objArrayOop.hpp" |
1972 | 35 #include "runtime/arguments.hpp" |
36 #include "runtime/java.hpp" | |
37 #include "runtime/os.hpp" | |
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38 #include "services/memTracker.hpp" |
1972 | 39 #include "utilities/defaultStream.hpp" |
40 | |
0 | 41 # include <sys/stat.h> |
42 # include <errno.h> | |
43 | |
44 #ifndef O_BINARY // if defined (Win32) use binary files. | |
45 #define O_BINARY 0 // otherwise do nothing. | |
46 #endif | |
47 | |
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48 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
0 | 49 extern address JVM_FunctionAtStart(); |
50 extern address JVM_FunctionAtEnd(); | |
51 | |
605 | 52 // Complain and stop. All error conditions occurring during the writing of |
0 | 53 // an archive file should stop the process. Unrecoverable errors during |
54 // the reading of the archive file should stop the process. | |
55 | |
56 static void fail(const char *msg, va_list ap) { | |
57 // This occurs very early during initialization: tty is not initialized. | |
58 jio_fprintf(defaultStream::error_stream(), | |
605 | 59 "An error has occurred while processing the" |
0 | 60 " shared archive file.\n"); |
61 jio_vfprintf(defaultStream::error_stream(), msg, ap); | |
62 jio_fprintf(defaultStream::error_stream(), "\n"); | |
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63 // Do not change the text of the below message because some tests check for it. |
0 | 64 vm_exit_during_initialization("Unable to use shared archive.", NULL); |
65 } | |
66 | |
67 | |
68 void FileMapInfo::fail_stop(const char *msg, ...) { | |
69 va_list ap; | |
70 va_start(ap, msg); | |
71 fail(msg, ap); // Never returns. | |
72 va_end(ap); // for completeness. | |
73 } | |
74 | |
75 | |
76 // Complain and continue. Recoverable errors during the reading of the | |
77 // archive file may continue (with sharing disabled). | |
78 // | |
79 // If we continue, then disable shared spaces and close the file. | |
80 | |
81 void FileMapInfo::fail_continue(const char *msg, ...) { | |
82 va_list ap; | |
83 va_start(ap, msg); | |
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84 MetaspaceShared::set_archive_loading_failed(); |
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85 if (PrintSharedArchiveAndExit && _validating_classpath_entry_table) { |
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86 // If we are doing PrintSharedArchiveAndExit and some of the classpath entries |
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87 // do not validate, we can still continue "limping" to validate the remaining |
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88 // entries. No need to quit. |
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89 tty->print("["); |
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90 tty->vprint(msg, ap); |
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91 tty->print_cr("]"); |
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92 } else { |
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93 if (RequireSharedSpaces) { |
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94 fail(msg, ap); |
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95 } else { |
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96 if (PrintSharedSpaces) { |
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97 tty->print_cr("UseSharedSpaces: %s", msg); |
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98 } |
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99 } |
0 | 100 } |
101 va_end(ap); | |
102 UseSharedSpaces = false; | |
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103 assert(current_info() != NULL, "singleton must be registered"); |
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104 current_info()->close(); |
0 | 105 } |
106 | |
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107 // Fill in the fileMapInfo structure with data about this VM instance. |
0 | 108 |
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109 // This method copies the vm version info into header_version. If the version is too |
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110 // long then a truncated version, which has a hash code appended to it, is copied. |
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111 // |
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112 // Using a template enables this method to verify that header_version is an array of |
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113 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and |
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114 // the code that reads the CDS file will both use the same size buffer. Hence, will |
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115 // use identical truncation. This is necessary for matching of truncated versions. |
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116 template <int N> static void get_header_version(char (&header_version) [N]) { |
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117 assert(N == JVM_IDENT_MAX, "Bad header_version size"); |
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118 |
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119 const char *vm_version = VM_Version::internal_vm_info_string(); |
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120 const int version_len = (int)strlen(vm_version); |
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121 |
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122 if (version_len < (JVM_IDENT_MAX-1)) { |
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123 strcpy(header_version, vm_version); |
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124 |
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125 } else { |
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126 // Get the hash value. Use a static seed because the hash needs to return the same |
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127 // value over multiple jvm invocations. |
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128 unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len); |
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129 |
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130 // Truncate the ident, saving room for the 8 hex character hash value. |
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131 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); |
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132 |
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133 // Append the hash code as eight hex digits. |
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134 sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash); |
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135 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. |
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136 } |
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137 } |
0 | 138 |
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139 FileMapInfo::FileMapInfo() { |
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140 assert(_current_info == NULL, "must be singleton"); // not thread safe |
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141 _current_info = this; |
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142 memset(this, 0, sizeof(FileMapInfo)); |
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143 _file_offset = 0; |
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144 _file_open = false; |
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145 _header = SharedClassUtil::allocate_file_map_header(); |
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146 _header->_version = _invalid_version; |
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147 } |
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148 |
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149 FileMapInfo::~FileMapInfo() { |
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150 assert(_current_info == this, "must be singleton"); // not thread safe |
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151 _current_info = NULL; |
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152 } |
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153 |
0 | 154 void FileMapInfo::populate_header(size_t alignment) { |
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155 _header->populate(this, alignment); |
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156 } |
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157 |
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158 size_t FileMapInfo::FileMapHeader::data_size() { |
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159 return SharedClassUtil::file_map_header_size() - sizeof(FileMapInfo::FileMapHeaderBase); |
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160 } |
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161 |
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162 void FileMapInfo::FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) { |
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163 _magic = 0xf00baba2; |
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164 _version = _current_version; |
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165 _alignment = alignment; |
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166 _obj_alignment = ObjectAlignmentInBytes; |
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167 _classpath_entry_table_size = mapinfo->_classpath_entry_table_size; |
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168 _classpath_entry_table = mapinfo->_classpath_entry_table; |
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169 _classpath_entry_size = mapinfo->_classpath_entry_size; |
0 | 170 |
171 // The following fields are for sanity checks for whether this archive | |
172 // will function correctly with this JVM and the bootclasspath it's | |
173 // invoked with. | |
174 | |
175 // JVM version string ... changes on each build. | |
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176 get_header_version(_jvm_ident); |
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177 } |
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178 |
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179 void FileMapInfo::allocate_classpath_entry_table() { |
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180 int bytes = 0; |
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181 int count = 0; |
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182 char* strptr = NULL; |
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183 char* strptr_max = NULL; |
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184 Thread* THREAD = Thread::current(); |
0 | 185 |
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186 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); |
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187 size_t entry_size = SharedClassUtil::shared_class_path_entry_size(); |
0 | 188 |
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189 for (int pass=0; pass<2; pass++) { |
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190 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); |
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191 |
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192 for (int cur_entry = 0 ; cpe != NULL; cpe = cpe->next(), cur_entry++) { |
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193 const char *name = cpe->name(); |
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194 int name_bytes = (int)(strlen(name) + 1); |
0 | 195 |
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196 if (pass == 0) { |
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197 count ++; |
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198 bytes += (int)entry_size; |
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199 bytes += name_bytes; |
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200 if (TraceClassPaths || (TraceClassLoading && Verbose)) { |
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201 tty->print_cr("[Add main shared path (%s) %s]", (cpe->is_jar_file() ? "jar" : "dir"), name); |
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202 } |
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203 } else { |
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204 SharedClassPathEntry* ent = shared_classpath(cur_entry); |
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205 if (cpe->is_jar_file()) { |
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206 struct stat st; |
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207 if (os::stat(name, &st) != 0) { |
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208 // The file/dir must exist, or it would not have been added |
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209 // into ClassLoader::classpath_entry(). |
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210 // |
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211 // If we can't access a jar file in the boot path, then we can't |
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212 // make assumptions about where classes get loaded from. |
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213 FileMapInfo::fail_stop("Unable to open jar file %s.", name); |
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214 } |
0 | 215 |
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216 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error. |
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217 SharedClassUtil::update_shared_classpath(cpe, ent, st.st_mtime, st.st_size, THREAD); |
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218 } else { |
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219 ent->_filesize = -1; |
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220 if (!os::dir_is_empty(name)) { |
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221 ClassLoader::exit_with_path_failure("Cannot have non-empty directory in archived classpaths", name); |
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222 } |
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223 } |
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224 ent->_name = strptr; |
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225 if (strptr + name_bytes <= strptr_max) { |
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226 strncpy(strptr, name, (size_t)name_bytes); // name_bytes includes trailing 0. |
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227 strptr += name_bytes; |
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228 } else { |
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229 assert(0, "miscalculated buffer size"); |
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230 } |
0 | 231 } |
232 } | |
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233 |
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234 if (pass == 0) { |
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235 EXCEPTION_MARK; // The following call should never throw, but would exit VM on error. |
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236 Array<u8>* arr = MetadataFactory::new_array<u8>(loader_data, (bytes + 7)/8, THREAD); |
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237 strptr = (char*)(arr->data()); |
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238 strptr_max = strptr + bytes; |
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239 SharedClassPathEntry* table = (SharedClassPathEntry*)strptr; |
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240 strptr += entry_size * count; |
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241 |
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242 _classpath_entry_table_size = count; |
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243 _classpath_entry_table = table; |
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244 _classpath_entry_size = entry_size; |
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245 } |
0 | 246 } |
247 } | |
248 | |
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249 bool FileMapInfo::validate_classpath_entry_table() { |
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250 _validating_classpath_entry_table = true; |
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251 |
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252 int count = _header->_classpath_entry_table_size; |
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253 |
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254 _classpath_entry_table = _header->_classpath_entry_table; |
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255 _classpath_entry_size = _header->_classpath_entry_size; |
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256 |
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257 for (int i=0; i<count; i++) { |
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258 SharedClassPathEntry* ent = shared_classpath(i); |
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259 struct stat st; |
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260 const char* name = ent->_name; |
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261 bool ok = true; |
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262 if (TraceClassPaths || (TraceClassLoading && Verbose)) { |
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263 tty->print_cr("[Checking shared classpath entry: %s]", name); |
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264 } |
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265 if (os::stat(name, &st) != 0) { |
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266 fail_continue("Required classpath entry does not exist: %s", name); |
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267 ok = false; |
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268 } else if (ent->is_dir()) { |
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269 if (!os::dir_is_empty(name)) { |
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270 fail_continue("directory is not empty: %s", name); |
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271 ok = false; |
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272 } |
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273 } else { |
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274 if (ent->_timestamp != st.st_mtime || |
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275 ent->_filesize != st.st_size) { |
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276 ok = false; |
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277 if (PrintSharedArchiveAndExit) { |
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278 fail_continue(ent->_timestamp != st.st_mtime ? |
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279 "Timestamp mismatch" : |
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280 "File size mismatch"); |
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281 } else { |
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282 fail_continue("A jar file is not the one used while building" |
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283 " the shared archive file: %s", name); |
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284 } |
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285 } |
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286 } |
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287 if (ok) { |
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288 if (TraceClassPaths || (TraceClassLoading && Verbose)) { |
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289 tty->print_cr("[ok]"); |
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290 } |
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291 } else if (!PrintSharedArchiveAndExit) { |
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292 _validating_classpath_entry_table = false; |
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293 return false; |
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294 } |
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295 } |
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296 |
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297 _classpath_entry_table_size = _header->_classpath_entry_table_size; |
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298 _validating_classpath_entry_table = false; |
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299 return true; |
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300 } |
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301 |
0 | 302 |
303 // Read the FileMapInfo information from the file. | |
304 | |
305 bool FileMapInfo::init_from_file(int fd) { | |
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306 size_t sz = _header->data_size(); |
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307 char* addr = _header->data(); |
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308 size_t n = os::read(fd, addr, (unsigned int)sz); |
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309 if (n != sz) { |
0 | 310 fail_continue("Unable to read the file header."); |
311 return false; | |
312 } | |
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313 if (_header->_version != current_version()) { |
0 | 314 fail_continue("The shared archive file has the wrong version."); |
315 return false; | |
316 } | |
317 _file_offset = (long)n; | |
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318 |
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319 size_t info_size = _header->_paths_misc_info_size; |
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320 _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass); |
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321 if (_paths_misc_info == NULL) { |
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322 fail_continue("Unable to read the file header."); |
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323 return false; |
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324 } |
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325 n = os::read(fd, _paths_misc_info, (unsigned int)info_size); |
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326 if (n != info_size) { |
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327 fail_continue("Unable to read the shared path info header."); |
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328 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass); |
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329 _paths_misc_info = NULL; |
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330 return false; |
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331 } |
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332 |
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333 _file_offset += (long)n; |
0 | 334 return true; |
335 } | |
336 | |
337 | |
338 // Read the FileMapInfo information from the file. | |
339 bool FileMapInfo::open_for_read() { | |
340 _full_path = Arguments::GetSharedArchivePath(); | |
341 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); | |
342 if (fd < 0) { | |
343 if (errno == ENOENT) { | |
344 // Not locating the shared archive is ok. | |
345 fail_continue("Specified shared archive not found."); | |
346 } else { | |
347 fail_continue("Failed to open shared archive file (%s).", | |
348 strerror(errno)); | |
349 } | |
350 return false; | |
351 } | |
352 | |
353 _fd = fd; | |
354 _file_open = true; | |
355 return true; | |
356 } | |
357 | |
358 | |
359 // Write the FileMapInfo information to the file. | |
360 | |
361 void FileMapInfo::open_for_write() { | |
362 _full_path = Arguments::GetSharedArchivePath(); | |
363 if (PrintSharedSpaces) { | |
364 tty->print_cr("Dumping shared data to file: "); | |
365 tty->print_cr(" %s", _full_path); | |
366 } | |
367 | |
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368 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. |
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369 chmod(_full_path, _S_IREAD | _S_IWRITE); |
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370 #endif |
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371 |
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372 // Use remove() to delete the existing file because, on Unix, this will |
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373 // allow processes that have it open continued access to the file. |
0 | 374 remove(_full_path); |
375 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); | |
376 if (fd < 0) { | |
377 fail_stop("Unable to create shared archive file %s.", _full_path); | |
378 } | |
379 _fd = fd; | |
380 _file_offset = 0; | |
381 _file_open = true; | |
382 } | |
383 | |
384 | |
385 // Write the header to the file, seek to the next allocation boundary. | |
386 | |
387 void FileMapInfo::write_header() { | |
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388 int info_size = ClassLoader::get_shared_paths_misc_info_size(); |
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389 |
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390 _header->_paths_misc_info_size = info_size; |
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391 |
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392 align_file_position(); |
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393 size_t sz = _header->data_size(); |
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394 char* addr = _header->data(); |
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395 write_bytes(addr, (int)sz); // skip the C++ vtable |
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396 write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size); |
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397 align_file_position(); |
0 | 398 } |
399 | |
400 | |
401 // Dump shared spaces to file. | |
402 | |
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403 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) { |
0 | 404 align_file_position(); |
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405 size_t used = space->used_bytes_slow(Metaspace::NonClassType); |
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406 size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType); |
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407 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
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408 write_region(i, (char*)space->bottom(), used, capacity, read_only, false); |
0 | 409 } |
410 | |
411 | |
412 // Dump region to file. | |
413 | |
414 void FileMapInfo::write_region(int region, char* base, size_t size, | |
415 size_t capacity, bool read_only, | |
416 bool allow_exec) { | |
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417 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[region]; |
0 | 418 |
419 if (_file_open) { | |
420 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); | |
421 if (PrintSharedSpaces) { | |
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422 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT |
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423 " file offset 0x%6x", region, size, base, _file_offset); |
0 | 424 } |
425 } else { | |
426 si->_file_offset = _file_offset; | |
427 } | |
428 si->_base = base; | |
429 si->_used = size; | |
430 si->_capacity = capacity; | |
431 si->_read_only = read_only; | |
432 si->_allow_exec = allow_exec; | |
433 write_bytes_aligned(base, (int)size); | |
434 } | |
435 | |
436 | |
437 // Dump bytes to file -- at the current file position. | |
438 | |
439 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { | |
440 if (_file_open) { | |
441 int n = ::write(_fd, buffer, nbytes); | |
442 if (n != nbytes) { | |
443 // It is dangerous to leave the corrupted shared archive file around, | |
444 // close and remove the file. See bug 6372906. | |
445 close(); | |
446 remove(_full_path); | |
447 fail_stop("Unable to write to shared archive file.", NULL); | |
448 } | |
449 } | |
450 _file_offset += nbytes; | |
451 } | |
452 | |
453 | |
454 // Align file position to an allocation unit boundary. | |
455 | |
456 void FileMapInfo::align_file_position() { | |
457 long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); | |
458 if (new_file_offset != _file_offset) { | |
459 _file_offset = new_file_offset; | |
460 if (_file_open) { | |
461 // Seek one byte back from the target and write a byte to insure | |
462 // that the written file is the correct length. | |
463 _file_offset -= 1; | |
464 if (lseek(_fd, _file_offset, SEEK_SET) < 0) { | |
465 fail_stop("Unable to seek.", NULL); | |
466 } | |
467 char zero = 0; | |
468 write_bytes(&zero, 1); | |
469 } | |
470 } | |
471 } | |
472 | |
473 | |
474 // Dump bytes to file -- at the current file position. | |
475 | |
476 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { | |
477 align_file_position(); | |
478 write_bytes(buffer, nbytes); | |
479 align_file_position(); | |
480 } | |
481 | |
482 | |
483 // Close the shared archive file. This does NOT unmap mapped regions. | |
484 | |
485 void FileMapInfo::close() { | |
486 if (_file_open) { | |
487 if (::close(_fd) < 0) { | |
488 fail_stop("Unable to close the shared archive file."); | |
489 } | |
490 _file_open = false; | |
491 _fd = -1; | |
492 } | |
493 } | |
494 | |
495 | |
496 // JVM/TI RedefineClasses() support: | |
497 // Remap the shared readonly space to shared readwrite, private. | |
498 bool FileMapInfo::remap_shared_readonly_as_readwrite() { | |
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499 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0]; |
0 | 500 if (!si->_read_only) { |
501 // the space is already readwrite so we are done | |
502 return true; | |
503 } | |
504 size_t used = si->_used; | |
505 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
506 if (!open_for_read()) { | |
507 return false; | |
508 } | |
509 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, | |
510 si->_base, size, false /* !read_only */, | |
511 si->_allow_exec); | |
512 close(); | |
513 if (base == NULL) { | |
514 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); | |
515 return false; | |
516 } | |
517 if (base != si->_base) { | |
518 fail_continue("Unable to remap shared readonly space at required address."); | |
519 return false; | |
520 } | |
521 si->_read_only = false; | |
522 return true; | |
523 } | |
524 | |
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525 // Map the whole region at once, assumed to be allocated contiguously. |
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526 ReservedSpace FileMapInfo::reserve_shared_memory() { |
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527 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0]; |
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528 char* requested_addr = si->_base; |
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529 |
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530 size_t size = FileMapInfo::shared_spaces_size(); |
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531 |
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532 // Reserve the space first, then map otherwise map will go right over some |
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533 // other reserved memory (like the code cache). |
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534 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr); |
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535 if (!rs.is_reserved()) { |
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536 fail_continue(err_msg("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr)); |
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537 return rs; |
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538 } |
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539 // the reserved virtual memory is for mapping class data sharing archive |
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540 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); |
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541 |
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542 return rs; |
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543 } |
0 | 544 |
545 // Memory map a region in the address space. | |
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546 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"}; |
0 | 547 |
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548 char* FileMapInfo::map_region(int i) { |
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549 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
0 | 550 size_t used = si->_used; |
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551 size_t alignment = os::vm_allocation_granularity(); |
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552 size_t size = align_size_up(used, alignment); |
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553 char *requested_addr = si->_base; |
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554 |
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555 // map the contents of the CDS archive in this memory |
0 | 556 char *base = os::map_memory(_fd, _full_path, si->_file_offset, |
557 requested_addr, size, si->_read_only, | |
558 si->_allow_exec); | |
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559 if (base == NULL || base != si->_base) { |
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560 fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i])); |
0 | 561 return NULL; |
562 } | |
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563 #ifdef _WINDOWS |
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564 // This call is Windows-only because the memory_type gets recorded for the other platforms |
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565 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. |
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566 MemTracker::record_virtual_memory_type((address)base, mtClassShared); |
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567 #endif |
0 | 568 return base; |
569 } | |
570 | |
571 | |
572 // Unmap a memory region in the address space. | |
573 | |
574 void FileMapInfo::unmap_region(int i) { | |
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575 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
0 | 576 size_t used = si->_used; |
577 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
578 if (!os::unmap_memory(si->_base, size)) { | |
579 fail_stop("Unable to unmap shared space."); | |
580 } | |
581 } | |
582 | |
583 | |
584 void FileMapInfo::assert_mark(bool check) { | |
585 if (!check) { | |
586 fail_stop("Mark mismatch while restoring from shared file.", NULL); | |
587 } | |
588 } | |
589 | |
590 | |
591 FileMapInfo* FileMapInfo::_current_info = NULL; | |
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592 SharedClassPathEntry* FileMapInfo::_classpath_entry_table = NULL; |
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593 int FileMapInfo::_classpath_entry_table_size = 0; |
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594 size_t FileMapInfo::_classpath_entry_size = 0x1234baad; |
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595 bool FileMapInfo::_validating_classpath_entry_table = false; |
0 | 596 |
597 // Open the shared archive file, read and validate the header | |
598 // information (version, boot classpath, etc.). If initialization | |
599 // fails, shared spaces are disabled and the file is closed. [See | |
600 // fail_continue.] | |
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601 // |
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602 // Validation of the archive is done in two steps: |
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603 // |
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604 // [1] validate_header() - done here. This checks the header, including _paths_misc_info. |
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605 // [2] validate_classpath_entry_table - this is done later, because the table is in the RW |
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606 // region of the archive, which is not mapped yet. |
0 | 607 bool FileMapInfo::initialize() { |
608 assert(UseSharedSpaces, "UseSharedSpaces expected."); | |
609 | |
610 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { | |
611 fail_continue("Tool agent requires sharing to be disabled."); | |
612 return false; | |
613 } | |
614 | |
615 if (!open_for_read()) { | |
616 return false; | |
617 } | |
618 | |
619 init_from_file(_fd); | |
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620 if (!validate_header()) { |
0 | 621 return false; |
622 } | |
623 | |
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624 SharedReadOnlySize = _header->_space[0]._capacity; |
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625 SharedReadWriteSize = _header->_space[1]._capacity; |
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626 SharedMiscDataSize = _header->_space[2]._capacity; |
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627 SharedMiscCodeSize = _header->_space[3]._capacity; |
0 | 628 return true; |
629 } | |
630 | |
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631 bool FileMapInfo::FileMapHeader::validate() { |
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632 if (_version != current_version()) { |
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633 FileMapInfo::fail_continue("The shared archive file is the wrong version."); |
0 | 634 return false; |
635 } | |
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636 if (_magic != (int)0xf00baba2) { |
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637 FileMapInfo::fail_continue("The shared archive file has a bad magic number."); |
0 | 638 return false; |
639 } | |
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640 char header_version[JVM_IDENT_MAX]; |
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641 get_header_version(header_version); |
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642 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { |
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643 if (TraceClassPaths) { |
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644 tty->print_cr("Expected: %s", header_version); |
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645 tty->print_cr("Actual: %s", _jvm_ident); |
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646 } |
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647 FileMapInfo::fail_continue("The shared archive file was created by a different" |
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648 " version or build of HotSpot"); |
0 | 649 return false; |
650 } | |
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651 if (_obj_alignment != ObjectAlignmentInBytes) { |
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652 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" |
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653 " does not equal the current ObjectAlignmentInBytes of %d.", |
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654 _obj_alignment, ObjectAlignmentInBytes); |
0 | 655 return false; |
656 } | |
657 | |
658 return true; | |
659 } | |
660 | |
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661 bool FileMapInfo::validate_header() { |
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662 bool status = _header->validate(); |
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663 |
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664 if (status) { |
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665 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) { |
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666 if (!PrintSharedArchiveAndExit) { |
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667 fail_continue("shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)"); |
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668 status = false; |
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669 } |
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670 } |
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671 } |
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672 |
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673 if (_paths_misc_info != NULL) { |
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674 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass); |
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675 _paths_misc_info = NULL; |
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676 } |
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677 return status; |
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678 } |
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679 |
0 | 680 // The following method is provided to see whether a given pointer |
681 // falls in the mapped shared space. | |
682 // Param: | |
683 // p, The given pointer | |
684 // Return: | |
685 // True if the p is within the mapped shared space, otherwise, false. | |
686 bool FileMapInfo::is_in_shared_space(const void* p) { | |
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687 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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688 if (p >= _header->_space[i]._base && |
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689 p < _header->_space[i]._base + _header->_space[i]._used) { |
0 | 690 return true; |
691 } | |
692 } | |
693 | |
694 return false; | |
695 } | |
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696 |
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697 void FileMapInfo::print_shared_spaces() { |
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698 gclog_or_tty->print_cr("Shared Spaces:"); |
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699 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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700 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
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701 gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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702 shared_region_name[i], |
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703 si->_base, si->_base + si->_used); |
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704 } |
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705 } |
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706 |
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707 // Unmap mapped regions of shared space. |
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708 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { |
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709 FileMapInfo *map_info = FileMapInfo::current_info(); |
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710 if (map_info) { |
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711 map_info->fail_continue(msg); |
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712 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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713 if (map_info->_header->_space[i]._base != NULL) { |
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714 map_info->unmap_region(i); |
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715 map_info->_header->_space[i]._base = NULL; |
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716 } |
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717 } |
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718 } else if (DumpSharedSpaces) { |
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719 fail_stop(msg, NULL); |
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720 } |
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721 } |