Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/filemap.cpp @ 24145:2f2299c68571 jvmci-0.27
change default of UseJVMCICompiler based on jvmci.Compiler property (which can now be set from <java.home>/jre/lib/jvmci/compiler-name)
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 15 Jun 2017 21:38:21 +0200 |
parents | 0558eb13dcf3 |
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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 } |
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100 UseSharedSpaces = false; |
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101 assert(current_info() != NULL, "singleton must be registered"); |
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102 current_info()->close(); |
0 | 103 } |
104 va_end(ap); | |
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 } | |
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317 |
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318 size_t info_size = _header->_paths_misc_info_size; |
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319 _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass); |
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320 if (_paths_misc_info == NULL) { |
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321 fail_continue("Unable to read the file header."); |
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322 return false; |
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323 } |
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324 n = os::read(fd, _paths_misc_info, (unsigned int)info_size); |
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325 if (n != info_size) { |
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326 fail_continue("Unable to read the shared path info header."); |
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327 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass); |
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328 _paths_misc_info = NULL; |
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329 return false; |
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330 } |
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331 |
18096 | 332 size_t len = lseek(fd, 0, SEEK_END); |
333 struct FileMapInfo::FileMapHeader::space_info* si = | |
20527 | 334 &_header->_space[MetaspaceShared::mc]; |
18096 | 335 if (si->_file_offset >= len || len - si->_file_offset < si->_used) { |
336 fail_continue("The shared archive file has been truncated."); | |
337 return false; | |
338 } | |
20527 | 339 |
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340 _file_offset += (long)n; |
0 | 341 return true; |
342 } | |
343 | |
344 | |
345 // Read the FileMapInfo information from the file. | |
346 bool FileMapInfo::open_for_read() { | |
347 _full_path = Arguments::GetSharedArchivePath(); | |
348 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); | |
349 if (fd < 0) { | |
350 if (errno == ENOENT) { | |
351 // Not locating the shared archive is ok. | |
352 fail_continue("Specified shared archive not found."); | |
353 } else { | |
354 fail_continue("Failed to open shared archive file (%s).", | |
355 strerror(errno)); | |
356 } | |
357 return false; | |
358 } | |
359 | |
360 _fd = fd; | |
361 _file_open = true; | |
362 return true; | |
363 } | |
364 | |
365 | |
366 // Write the FileMapInfo information to the file. | |
367 | |
368 void FileMapInfo::open_for_write() { | |
369 _full_path = Arguments::GetSharedArchivePath(); | |
370 if (PrintSharedSpaces) { | |
371 tty->print_cr("Dumping shared data to file: "); | |
372 tty->print_cr(" %s", _full_path); | |
373 } | |
374 | |
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375 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. |
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376 chmod(_full_path, _S_IREAD | _S_IWRITE); |
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377 #endif |
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378 |
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379 // Use remove() to delete the existing file because, on Unix, this will |
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380 // allow processes that have it open continued access to the file. |
0 | 381 remove(_full_path); |
382 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); | |
383 if (fd < 0) { | |
384 fail_stop("Unable to create shared archive file %s.", _full_path); | |
385 } | |
386 _fd = fd; | |
387 _file_offset = 0; | |
388 _file_open = true; | |
389 } | |
390 | |
391 | |
392 // Write the header to the file, seek to the next allocation boundary. | |
393 | |
394 void FileMapInfo::write_header() { | |
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395 int info_size = ClassLoader::get_shared_paths_misc_info_size(); |
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396 |
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397 _header->_paths_misc_info_size = info_size; |
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398 |
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399 align_file_position(); |
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400 size_t sz = _header->data_size(); |
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401 char* addr = _header->data(); |
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402 write_bytes(addr, (int)sz); // skip the C++ vtable |
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403 write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size); |
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404 align_file_position(); |
0 | 405 } |
406 | |
407 | |
408 // Dump shared spaces to file. | |
409 | |
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410 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) { |
0 | 411 align_file_position(); |
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412 size_t used = space->used_bytes_slow(Metaspace::NonClassType); |
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413 size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType); |
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414 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
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415 write_region(i, (char*)space->bottom(), used, capacity, read_only, false); |
0 | 416 } |
417 | |
418 | |
419 // Dump region to file. | |
420 | |
421 void FileMapInfo::write_region(int region, char* base, size_t size, | |
422 size_t capacity, bool read_only, | |
423 bool allow_exec) { | |
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424 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[region]; |
0 | 425 |
426 if (_file_open) { | |
427 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); | |
428 if (PrintSharedSpaces) { | |
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429 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT |
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430 " file offset 0x%6x", region, size, base, _file_offset); |
0 | 431 } |
432 } else { | |
433 si->_file_offset = _file_offset; | |
434 } | |
435 si->_base = base; | |
436 si->_used = size; | |
437 si->_capacity = capacity; | |
438 si->_read_only = read_only; | |
439 si->_allow_exec = allow_exec; | |
18096 | 440 si->_crc = ClassLoader::crc32(0, base, (jint)size); |
0 | 441 write_bytes_aligned(base, (int)size); |
442 } | |
443 | |
444 | |
445 // Dump bytes to file -- at the current file position. | |
446 | |
447 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { | |
448 if (_file_open) { | |
449 int n = ::write(_fd, buffer, nbytes); | |
450 if (n != nbytes) { | |
451 // It is dangerous to leave the corrupted shared archive file around, | |
452 // close and remove the file. See bug 6372906. | |
453 close(); | |
454 remove(_full_path); | |
455 fail_stop("Unable to write to shared archive file.", NULL); | |
456 } | |
457 } | |
458 _file_offset += nbytes; | |
459 } | |
460 | |
461 | |
462 // Align file position to an allocation unit boundary. | |
463 | |
464 void FileMapInfo::align_file_position() { | |
18096 | 465 size_t new_file_offset = align_size_up(_file_offset, |
466 os::vm_allocation_granularity()); | |
0 | 467 if (new_file_offset != _file_offset) { |
468 _file_offset = new_file_offset; | |
469 if (_file_open) { | |
470 // Seek one byte back from the target and write a byte to insure | |
471 // that the written file is the correct length. | |
472 _file_offset -= 1; | |
18096 | 473 if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) { |
0 | 474 fail_stop("Unable to seek.", NULL); |
475 } | |
476 char zero = 0; | |
477 write_bytes(&zero, 1); | |
478 } | |
479 } | |
480 } | |
481 | |
482 | |
483 // Dump bytes to file -- at the current file position. | |
484 | |
485 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { | |
486 align_file_position(); | |
487 write_bytes(buffer, nbytes); | |
488 align_file_position(); | |
489 } | |
490 | |
491 | |
492 // Close the shared archive file. This does NOT unmap mapped regions. | |
493 | |
494 void FileMapInfo::close() { | |
495 if (_file_open) { | |
496 if (::close(_fd) < 0) { | |
497 fail_stop("Unable to close the shared archive file."); | |
498 } | |
499 _file_open = false; | |
500 _fd = -1; | |
501 } | |
502 } | |
503 | |
504 | |
505 // JVM/TI RedefineClasses() support: | |
506 // Remap the shared readonly space to shared readwrite, private. | |
507 bool FileMapInfo::remap_shared_readonly_as_readwrite() { | |
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508 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0]; |
0 | 509 if (!si->_read_only) { |
510 // the space is already readwrite so we are done | |
511 return true; | |
512 } | |
513 size_t used = si->_used; | |
514 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
515 if (!open_for_read()) { | |
516 return false; | |
517 } | |
518 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, | |
519 si->_base, size, false /* !read_only */, | |
520 si->_allow_exec); | |
521 close(); | |
522 if (base == NULL) { | |
523 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); | |
524 return false; | |
525 } | |
526 if (base != si->_base) { | |
527 fail_continue("Unable to remap shared readonly space at required address."); | |
528 return false; | |
529 } | |
530 si->_read_only = false; | |
531 return true; | |
532 } | |
533 | |
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534 // Map the whole region at once, assumed to be allocated contiguously. |
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535 ReservedSpace FileMapInfo::reserve_shared_memory() { |
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536 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[0]; |
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537 char* requested_addr = si->_base; |
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538 |
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539 size_t size = FileMapInfo::shared_spaces_size(); |
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540 |
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541 // Reserve the space first, then map otherwise map will go right over some |
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542 // other reserved memory (like the code cache). |
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543 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr); |
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544 if (!rs.is_reserved()) { |
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545 fail_continue(err_msg("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr)); |
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546 return rs; |
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547 } |
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548 // the reserved virtual memory is for mapping class data sharing archive |
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549 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); |
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550 |
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551 return rs; |
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552 } |
0 | 553 |
554 // Memory map a region in the address space. | |
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555 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"}; |
0 | 556 |
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557 char* FileMapInfo::map_region(int i) { |
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558 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
0 | 559 size_t used = si->_used; |
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560 size_t alignment = os::vm_allocation_granularity(); |
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561 size_t size = align_size_up(used, alignment); |
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562 char *requested_addr = si->_base; |
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563 |
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564 // map the contents of the CDS archive in this memory |
0 | 565 char *base = os::map_memory(_fd, _full_path, si->_file_offset, |
566 requested_addr, size, si->_read_only, | |
567 si->_allow_exec); | |
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568 if (base == NULL || base != si->_base) { |
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569 fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i])); |
0 | 570 return NULL; |
571 } | |
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572 #ifdef _WINDOWS |
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573 // This call is Windows-only because the memory_type gets recorded for the other platforms |
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574 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. |
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575 MemTracker::record_virtual_memory_type((address)base, mtClassShared); |
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576 #endif |
0 | 577 return base; |
578 } | |
579 | |
18096 | 580 bool FileMapInfo::verify_region_checksum(int i) { |
581 if (!VerifySharedSpaces) { | |
582 return true; | |
583 } | |
20527 | 584 const char* buf = _header->_space[i]._base; |
585 size_t sz = _header->_space[i]._used; | |
18096 | 586 int crc = ClassLoader::crc32(0, buf, (jint)sz); |
20527 | 587 if (crc != _header->_space[i]._crc) { |
18096 | 588 fail_continue("Checksum verification failed."); |
589 return false; | |
590 } | |
591 return true; | |
592 } | |
0 | 593 |
594 // Unmap a memory region in the address space. | |
595 | |
596 void FileMapInfo::unmap_region(int i) { | |
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597 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
0 | 598 size_t used = si->_used; |
599 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
600 if (!os::unmap_memory(si->_base, size)) { | |
601 fail_stop("Unable to unmap shared space."); | |
602 } | |
603 } | |
604 | |
605 | |
606 void FileMapInfo::assert_mark(bool check) { | |
607 if (!check) { | |
608 fail_stop("Mark mismatch while restoring from shared file.", NULL); | |
609 } | |
610 } | |
611 | |
612 | |
613 FileMapInfo* FileMapInfo::_current_info = NULL; | |
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614 SharedClassPathEntry* FileMapInfo::_classpath_entry_table = NULL; |
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615 int FileMapInfo::_classpath_entry_table_size = 0; |
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616 size_t FileMapInfo::_classpath_entry_size = 0x1234baad; |
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617 bool FileMapInfo::_validating_classpath_entry_table = false; |
0 | 618 |
619 // Open the shared archive file, read and validate the header | |
620 // information (version, boot classpath, etc.). If initialization | |
621 // fails, shared spaces are disabled and the file is closed. [See | |
622 // fail_continue.] | |
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623 // |
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624 // Validation of the archive is done in two steps: |
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625 // |
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626 // [1] validate_header() - done here. This checks the header, including _paths_misc_info. |
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627 // [2] validate_classpath_entry_table - this is done later, because the table is in the RW |
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628 // region of the archive, which is not mapped yet. |
0 | 629 bool FileMapInfo::initialize() { |
630 assert(UseSharedSpaces, "UseSharedSpaces expected."); | |
631 | |
632 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { | |
633 fail_continue("Tool agent requires sharing to be disabled."); | |
634 return false; | |
635 } | |
636 | |
637 if (!open_for_read()) { | |
638 return false; | |
639 } | |
640 | |
641 init_from_file(_fd); | |
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642 if (!validate_header()) { |
0 | 643 return false; |
644 } | |
645 | |
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646 SharedReadOnlySize = _header->_space[0]._capacity; |
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647 SharedReadWriteSize = _header->_space[1]._capacity; |
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648 SharedMiscDataSize = _header->_space[2]._capacity; |
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649 SharedMiscCodeSize = _header->_space[3]._capacity; |
0 | 650 return true; |
651 } | |
652 | |
20527 | 653 int FileMapInfo::FileMapHeader::compute_crc() { |
654 char* header = data(); | |
18096 | 655 // start computing from the field after _crc |
20527 | 656 char* buf = (char*)&_crc + sizeof(int); |
657 size_t sz = data_size() - (buf - header); | |
18096 | 658 int crc = ClassLoader::crc32(0, buf, (jint)sz); |
659 return crc; | |
660 } | |
0 | 661 |
20527 | 662 int FileMapInfo::compute_header_crc() { |
663 return _header->compute_crc(); | |
664 } | |
665 | |
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666 bool FileMapInfo::FileMapHeader::validate() { |
20527 | 667 if (_magic != (int)0xf00baba2) { |
668 FileMapInfo::fail_continue("The shared archive file has a bad magic number."); | |
669 return false; | |
670 } | |
671 if (VerifySharedSpaces && compute_crc() != _crc) { | |
18096 | 672 fail_continue("Header checksum verification failed."); |
673 return false; | |
674 } | |
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675 if (_version != current_version()) { |
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676 FileMapInfo::fail_continue("The shared archive file is the wrong version."); |
20527 | 677 |
0 | 678 return false; |
679 } | |
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680 char header_version[JVM_IDENT_MAX]; |
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681 get_header_version(header_version); |
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682 if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { |
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683 if (TraceClassPaths) { |
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684 tty->print_cr("Expected: %s", header_version); |
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685 tty->print_cr("Actual: %s", _jvm_ident); |
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686 } |
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687 FileMapInfo::fail_continue("The shared archive file was created by a different" |
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688 " version or build of HotSpot"); |
0 | 689 return false; |
690 } | |
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691 if (_obj_alignment != ObjectAlignmentInBytes) { |
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692 FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" |
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693 " does not equal the current ObjectAlignmentInBytes of %d.", |
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694 _obj_alignment, ObjectAlignmentInBytes); |
0 | 695 return false; |
696 } | |
697 | |
698 return true; | |
699 } | |
700 | |
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701 bool FileMapInfo::validate_header() { |
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702 bool status = _header->validate(); |
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703 |
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704 if (status) { |
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705 if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) { |
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706 if (!PrintSharedArchiveAndExit) { |
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707 fail_continue("shared class paths mismatch (hint: enable -XX:+TraceClassPaths to diagnose the failure)"); |
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708 status = false; |
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709 } |
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710 } |
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711 } |
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712 |
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713 if (_paths_misc_info != NULL) { |
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714 FREE_C_HEAP_ARRAY(char, _paths_misc_info, mtClass); |
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715 _paths_misc_info = NULL; |
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716 } |
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717 return status; |
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718 } |
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719 |
0 | 720 // The following method is provided to see whether a given pointer |
721 // falls in the mapped shared space. | |
722 // Param: | |
723 // p, The given pointer | |
724 // Return: | |
725 // True if the p is within the mapped shared space, otherwise, false. | |
726 bool FileMapInfo::is_in_shared_space(const void* p) { | |
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727 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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728 if (p >= _header->_space[i]._base && |
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729 p < _header->_space[i]._base + _header->_space[i]._used) { |
0 | 730 return true; |
731 } | |
732 } | |
733 | |
734 return false; | |
735 } | |
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736 |
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737 void FileMapInfo::print_shared_spaces() { |
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738 gclog_or_tty->print_cr("Shared Spaces:"); |
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739 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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740 struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i]; |
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741 gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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742 shared_region_name[i], |
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743 si->_base, si->_base + si->_used); |
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744 } |
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745 } |
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746 |
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747 // Unmap mapped regions of shared space. |
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748 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { |
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749 FileMapInfo *map_info = FileMapInfo::current_info(); |
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750 if (map_info) { |
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751 map_info->fail_continue(msg); |
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752 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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753 if (map_info->_header->_space[i]._base != NULL) { |
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754 map_info->unmap_region(i); |
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755 map_info->_header->_space[i]._base = NULL; |
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756 } |
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757 } |
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758 } else if (DumpSharedSpaces) { |
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759 fail_stop(msg, NULL); |
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760 } |
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761 } |