Mercurial > hg > truffle
annotate src/share/vm/memory/filemap.cpp @ 20730:8210e5f2e21b
8044269: Analysis of archive files.
Summary: Add checksum verification.
Reviewed-by: iklam, dholmes, mschoene
| author | jiangli |
|---|---|
| date | Tue, 12 Aug 2014 17:46:16 -0400 |
| parents | 78bbf4d43a14 |
| children | 8cb56c8cb30d |
| rev | line source |
|---|---|
| 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" | |
| 27 #include "classfile/symbolTable.hpp" | |
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28 #include "classfile/altHashing.hpp" |
| 1972 | 29 #include "memory/filemap.hpp" |
| 30 #include "runtime/arguments.hpp" | |
| 31 #include "runtime/java.hpp" | |
| 32 #include "runtime/os.hpp" | |
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33 #include "services/memTracker.hpp" |
| 1972 | 34 #include "utilities/defaultStream.hpp" |
| 35 | |
| 0 | 36 # include <sys/stat.h> |
| 37 # include <errno.h> | |
| 38 | |
| 39 #ifndef O_BINARY // if defined (Win32) use binary files. | |
| 40 #define O_BINARY 0 // otherwise do nothing. | |
| 41 #endif | |
| 42 | |
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43 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
| 0 | 44 |
| 45 extern address JVM_FunctionAtStart(); | |
| 46 extern address JVM_FunctionAtEnd(); | |
| 47 | |
| 605 | 48 // Complain and stop. All error conditions occurring during the writing of |
| 0 | 49 // an archive file should stop the process. Unrecoverable errors during |
| 50 // the reading of the archive file should stop the process. | |
| 51 | |
| 52 static void fail(const char *msg, va_list ap) { | |
| 53 // This occurs very early during initialization: tty is not initialized. | |
| 54 jio_fprintf(defaultStream::error_stream(), | |
| 605 | 55 "An error has occurred while processing the" |
| 0 | 56 " shared archive file.\n"); |
| 57 jio_vfprintf(defaultStream::error_stream(), msg, ap); | |
| 58 jio_fprintf(defaultStream::error_stream(), "\n"); | |
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59 // Do not change the text of the below message because some tests check for it. |
| 0 | 60 vm_exit_during_initialization("Unable to use shared archive.", NULL); |
| 61 } | |
| 62 | |
| 63 | |
| 64 void FileMapInfo::fail_stop(const char *msg, ...) { | |
| 65 va_list ap; | |
| 66 va_start(ap, msg); | |
| 67 fail(msg, ap); // Never returns. | |
| 68 va_end(ap); // for completeness. | |
| 69 } | |
| 70 | |
| 71 | |
| 72 // Complain and continue. Recoverable errors during the reading of the | |
| 73 // archive file may continue (with sharing disabled). | |
| 74 // | |
| 75 // If we continue, then disable shared spaces and close the file. | |
| 76 | |
| 77 void FileMapInfo::fail_continue(const char *msg, ...) { | |
| 78 va_list ap; | |
| 79 va_start(ap, msg); | |
| 80 if (RequireSharedSpaces) { | |
| 81 fail(msg, ap); | |
| 82 } | |
| 83 va_end(ap); | |
| 84 UseSharedSpaces = false; | |
| 85 close(); | |
| 86 } | |
| 87 | |
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88 // Fill in the fileMapInfo structure with data about this VM instance. |
| 0 | 89 |
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90 // This method copies the vm version info into header_version. If the version is too |
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91 // long then a truncated version, which has a hash code appended to it, is copied. |
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92 // |
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93 // Using a template enables this method to verify that header_version is an array of |
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94 // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and |
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95 // the code that reads the CDS file will both use the same size buffer. Hence, will |
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96 // use identical truncation. This is necessary for matching of truncated versions. |
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97 template <int N> static void get_header_version(char (&header_version) [N]) { |
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98 assert(N == JVM_IDENT_MAX, "Bad header_version size"); |
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99 |
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100 const char *vm_version = VM_Version::internal_vm_info_string(); |
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101 const int version_len = (int)strlen(vm_version); |
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102 |
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103 if (version_len < (JVM_IDENT_MAX-1)) { |
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104 strcpy(header_version, vm_version); |
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105 |
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106 } else { |
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107 // Get the hash value. Use a static seed because the hash needs to return the same |
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108 // value over multiple jvm invocations. |
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109 unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len); |
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110 |
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111 // Truncate the ident, saving room for the 8 hex character hash value. |
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112 strncpy(header_version, vm_version, JVM_IDENT_MAX-9); |
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113 |
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114 // Append the hash code as eight hex digits. |
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115 sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash); |
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116 header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. |
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117 } |
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118 } |
| 0 | 119 |
| 120 void FileMapInfo::populate_header(size_t alignment) { | |
| 121 _header._magic = 0xf00baba2; | |
| 122 _header._version = _current_version; | |
| 123 _header._alignment = alignment; | |
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124 _header._obj_alignment = ObjectAlignmentInBytes; |
| 0 | 125 |
| 126 // The following fields are for sanity checks for whether this archive | |
| 127 // will function correctly with this JVM and the bootclasspath it's | |
| 128 // invoked with. | |
| 129 | |
| 130 // JVM version string ... changes on each build. | |
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131 get_header_version(_header._jvm_ident); |
| 0 | 132 |
| 133 // Build checks on classpath and jar files | |
| 134 _header._num_jars = 0; | |
| 135 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
| 136 for ( ; cpe != NULL; cpe = cpe->next()) { | |
| 137 | |
| 138 if (cpe->is_jar_file()) { | |
| 139 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
| 140 fail_stop("Too many jar files to share.", NULL); | |
| 141 } | |
| 142 | |
| 143 // Jar file - record timestamp and file size. | |
| 144 struct stat st; | |
| 145 const char *path = cpe->name(); | |
| 146 if (os::stat(path, &st) != 0) { | |
| 147 // If we can't access a jar file in the boot path, then we can't | |
| 148 // make assumptions about where classes get loaded from. | |
| 149 fail_stop("Unable to open jar file %s.", path); | |
| 150 } | |
| 151 _header._jar[_header._num_jars]._timestamp = st.st_mtime; | |
| 152 _header._jar[_header._num_jars]._filesize = st.st_size; | |
| 153 _header._num_jars++; | |
| 154 } else { | |
| 155 | |
| 156 // If directories appear in boot classpath, they must be empty to | |
| 157 // avoid having to verify each individual class file. | |
| 158 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
| 159 if (!os::dir_is_empty(name)) { | |
| 160 fail_stop("Boot classpath directory %s is not empty.", name); | |
| 161 } | |
| 162 } | |
| 163 } | |
| 164 } | |
| 165 | |
| 166 | |
| 167 // Read the FileMapInfo information from the file. | |
| 168 | |
| 169 bool FileMapInfo::init_from_file(int fd) { | |
| 170 | |
| 171 size_t n = read(fd, &_header, sizeof(struct FileMapHeader)); | |
| 172 if (n != sizeof(struct FileMapHeader)) { | |
| 173 fail_continue("Unable to read the file header."); | |
| 174 return false; | |
| 175 } | |
| 176 if (_header._version != current_version()) { | |
| 177 fail_continue("The shared archive file has the wrong version."); | |
| 178 return false; | |
| 179 } | |
| 20730 | 180 size_t len = lseek(fd, 0, SEEK_END); |
| 181 struct FileMapInfo::FileMapHeader::space_info* si = | |
| 182 &_header._space[MetaspaceShared::mc]; | |
| 183 if (si->_file_offset >= len || len - si->_file_offset < si->_used) { | |
| 184 fail_continue("The shared archive file has been truncated."); | |
| 185 return false; | |
| 186 } | |
| 187 _file_offset = n; | |
| 0 | 188 return true; |
| 189 } | |
| 190 | |
| 191 | |
| 192 // Read the FileMapInfo information from the file. | |
| 193 bool FileMapInfo::open_for_read() { | |
| 194 _full_path = Arguments::GetSharedArchivePath(); | |
| 195 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); | |
| 196 if (fd < 0) { | |
| 197 if (errno == ENOENT) { | |
| 198 // Not locating the shared archive is ok. | |
| 199 fail_continue("Specified shared archive not found."); | |
| 200 } else { | |
| 201 fail_continue("Failed to open shared archive file (%s).", | |
| 202 strerror(errno)); | |
| 203 } | |
| 204 return false; | |
| 205 } | |
| 206 | |
| 207 _fd = fd; | |
| 208 _file_open = true; | |
| 209 return true; | |
| 210 } | |
| 211 | |
| 212 | |
| 213 // Write the FileMapInfo information to the file. | |
| 214 | |
| 215 void FileMapInfo::open_for_write() { | |
| 216 _full_path = Arguments::GetSharedArchivePath(); | |
| 217 if (PrintSharedSpaces) { | |
| 218 tty->print_cr("Dumping shared data to file: "); | |
| 219 tty->print_cr(" %s", _full_path); | |
| 220 } | |
| 221 | |
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222 #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. |
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223 chmod(_full_path, _S_IREAD | _S_IWRITE); |
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224 #endif |
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225 |
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226 // Use remove() to delete the existing file because, on Unix, this will |
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227 // allow processes that have it open continued access to the file. |
| 0 | 228 remove(_full_path); |
| 229 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); | |
| 230 if (fd < 0) { | |
| 231 fail_stop("Unable to create shared archive file %s.", _full_path); | |
| 232 } | |
| 233 _fd = fd; | |
| 234 _file_offset = 0; | |
| 235 _file_open = true; | |
| 236 } | |
| 237 | |
| 238 | |
| 239 // Write the header to the file, seek to the next allocation boundary. | |
| 240 | |
| 241 void FileMapInfo::write_header() { | |
| 242 write_bytes_aligned(&_header, sizeof(FileMapHeader)); | |
| 243 } | |
| 244 | |
| 245 | |
| 246 // Dump shared spaces to file. | |
| 247 | |
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248 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) { |
| 0 | 249 align_file_position(); |
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250 size_t used = space->used_bytes_slow(Metaspace::NonClassType); |
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251 size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType); |
| 0 | 252 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
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253 write_region(i, (char*)space->bottom(), used, capacity, read_only, false); |
| 0 | 254 } |
| 255 | |
| 256 | |
| 257 // Dump region to file. | |
| 258 | |
| 259 void FileMapInfo::write_region(int region, char* base, size_t size, | |
| 260 size_t capacity, bool read_only, | |
| 261 bool allow_exec) { | |
| 262 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region]; | |
| 263 | |
| 264 if (_file_open) { | |
| 265 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); | |
| 266 if (PrintSharedSpaces) { | |
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267 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT |
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268 " file offset 0x%6x", region, size, base, _file_offset); |
| 0 | 269 } |
| 270 } else { | |
| 271 si->_file_offset = _file_offset; | |
| 272 } | |
| 273 si->_base = base; | |
| 274 si->_used = size; | |
| 275 si->_capacity = capacity; | |
| 276 si->_read_only = read_only; | |
| 277 si->_allow_exec = allow_exec; | |
| 20730 | 278 si->_crc = ClassLoader::crc32(0, base, (jint)size); |
| 0 | 279 write_bytes_aligned(base, (int)size); |
| 280 } | |
| 281 | |
| 282 | |
| 283 // Dump bytes to file -- at the current file position. | |
| 284 | |
| 285 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { | |
| 286 if (_file_open) { | |
| 287 int n = ::write(_fd, buffer, nbytes); | |
| 288 if (n != nbytes) { | |
| 289 // It is dangerous to leave the corrupted shared archive file around, | |
| 290 // close and remove the file. See bug 6372906. | |
| 291 close(); | |
| 292 remove(_full_path); | |
| 293 fail_stop("Unable to write to shared archive file.", NULL); | |
| 294 } | |
| 295 } | |
| 296 _file_offset += nbytes; | |
| 297 } | |
| 298 | |
| 299 | |
| 300 // Align file position to an allocation unit boundary. | |
| 301 | |
| 302 void FileMapInfo::align_file_position() { | |
| 20730 | 303 size_t new_file_offset = align_size_up(_file_offset, |
| 304 os::vm_allocation_granularity()); | |
| 0 | 305 if (new_file_offset != _file_offset) { |
| 306 _file_offset = new_file_offset; | |
| 307 if (_file_open) { | |
| 308 // Seek one byte back from the target and write a byte to insure | |
| 309 // that the written file is the correct length. | |
| 310 _file_offset -= 1; | |
| 20730 | 311 if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) { |
| 0 | 312 fail_stop("Unable to seek.", NULL); |
| 313 } | |
| 314 char zero = 0; | |
| 315 write_bytes(&zero, 1); | |
| 316 } | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 | |
| 321 // Dump bytes to file -- at the current file position. | |
| 322 | |
| 323 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { | |
| 324 align_file_position(); | |
| 325 write_bytes(buffer, nbytes); | |
| 326 align_file_position(); | |
| 327 } | |
| 328 | |
| 329 | |
| 330 // Close the shared archive file. This does NOT unmap mapped regions. | |
| 331 | |
| 332 void FileMapInfo::close() { | |
| 333 if (_file_open) { | |
| 334 if (::close(_fd) < 0) { | |
| 335 fail_stop("Unable to close the shared archive file."); | |
| 336 } | |
| 337 _file_open = false; | |
| 338 _fd = -1; | |
| 339 } | |
| 340 } | |
| 341 | |
| 342 | |
| 343 // JVM/TI RedefineClasses() support: | |
| 344 // Remap the shared readonly space to shared readwrite, private. | |
| 345 bool FileMapInfo::remap_shared_readonly_as_readwrite() { | |
| 346 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; | |
| 347 if (!si->_read_only) { | |
| 348 // the space is already readwrite so we are done | |
| 349 return true; | |
| 350 } | |
| 351 size_t used = si->_used; | |
| 352 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 353 if (!open_for_read()) { | |
| 354 return false; | |
| 355 } | |
| 356 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, | |
| 357 si->_base, size, false /* !read_only */, | |
| 358 si->_allow_exec); | |
| 359 close(); | |
| 360 if (base == NULL) { | |
| 361 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); | |
| 362 return false; | |
| 363 } | |
| 364 if (base != si->_base) { | |
| 365 fail_continue("Unable to remap shared readonly space at required address."); | |
| 366 return false; | |
| 367 } | |
| 368 si->_read_only = false; | |
| 369 return true; | |
| 370 } | |
| 371 | |
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372 // Map the whole region at once, assumed to be allocated contiguously. |
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373 ReservedSpace FileMapInfo::reserve_shared_memory() { |
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374 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; |
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375 char* requested_addr = si->_base; |
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376 |
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377 size_t size = FileMapInfo::shared_spaces_size(); |
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378 |
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379 // Reserve the space first, then map otherwise map will go right over some |
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380 // other reserved memory (like the code cache). |
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381 ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr); |
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382 if (!rs.is_reserved()) { |
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383 fail_continue(err_msg("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr)); |
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384 return rs; |
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385 } |
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386 // the reserved virtual memory is for mapping class data sharing archive |
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387 MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); |
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388 |
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389 return rs; |
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390 } |
| 0 | 391 |
| 392 // Memory map a region in the address space. | |
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393 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"}; |
| 0 | 394 |
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395 char* FileMapInfo::map_region(int i) { |
| 0 | 396 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
| 397 size_t used = si->_used; | |
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398 size_t alignment = os::vm_allocation_granularity(); |
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399 size_t size = align_size_up(used, alignment); |
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400 char *requested_addr = si->_base; |
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401 |
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402 // map the contents of the CDS archive in this memory |
| 0 | 403 char *base = os::map_memory(_fd, _full_path, si->_file_offset, |
| 404 requested_addr, size, si->_read_only, | |
| 405 si->_allow_exec); | |
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406 if (base == NULL || base != si->_base) { |
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407 fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i])); |
| 0 | 408 return NULL; |
| 409 } | |
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410 #ifdef _WINDOWS |
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411 // This call is Windows-only because the memory_type gets recorded for the other platforms |
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412 // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. |
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413 MemTracker::record_virtual_memory_type((address)base, mtClassShared); |
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414 #endif |
| 0 | 415 return base; |
| 416 } | |
| 417 | |
| 20730 | 418 bool FileMapInfo::verify_region_checksum(int i) { |
| 419 if (!VerifySharedSpaces) { | |
| 420 return true; | |
| 421 } | |
| 422 const char* buf = _header._space[i]._base; | |
| 423 size_t sz = _header._space[i]._used; | |
| 424 int crc = ClassLoader::crc32(0, buf, (jint)sz); | |
| 425 if (crc != _header._space[i]._crc) { | |
| 426 fail_continue("Checksum verification failed."); | |
| 427 return false; | |
| 428 } | |
| 429 return true; | |
| 430 } | |
| 0 | 431 |
| 432 // Unmap a memory region in the address space. | |
| 433 | |
| 434 void FileMapInfo::unmap_region(int i) { | |
| 435 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
| 436 size_t used = si->_used; | |
| 437 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 438 if (!os::unmap_memory(si->_base, size)) { | |
| 439 fail_stop("Unable to unmap shared space."); | |
| 440 } | |
| 441 } | |
| 442 | |
| 443 | |
| 444 void FileMapInfo::assert_mark(bool check) { | |
| 445 if (!check) { | |
| 446 fail_stop("Mark mismatch while restoring from shared file.", NULL); | |
| 447 } | |
| 448 } | |
| 449 | |
| 450 | |
| 451 FileMapInfo* FileMapInfo::_current_info = NULL; | |
| 452 | |
| 453 | |
| 454 // Open the shared archive file, read and validate the header | |
| 455 // information (version, boot classpath, etc.). If initialization | |
| 456 // fails, shared spaces are disabled and the file is closed. [See | |
| 457 // fail_continue.] | |
| 458 bool FileMapInfo::initialize() { | |
| 459 assert(UseSharedSpaces, "UseSharedSpaces expected."); | |
| 460 | |
| 461 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { | |
| 462 fail_continue("Tool agent requires sharing to be disabled."); | |
| 463 return false; | |
| 464 } | |
| 465 | |
| 466 if (!open_for_read()) { | |
| 467 return false; | |
| 468 } | |
| 469 | |
| 470 init_from_file(_fd); | |
| 471 if (!validate()) { | |
| 472 return false; | |
| 473 } | |
| 474 | |
| 475 SharedReadOnlySize = _header._space[0]._capacity; | |
| 476 SharedReadWriteSize = _header._space[1]._capacity; | |
| 477 SharedMiscDataSize = _header._space[2]._capacity; | |
| 478 SharedMiscCodeSize = _header._space[3]._capacity; | |
| 479 return true; | |
| 480 } | |
| 481 | |
| 20730 | 482 int FileMapInfo::compute_header_crc() { |
| 483 char* header = (char*)&_header; | |
| 484 // start computing from the field after _crc | |
| 485 char* buf = (char*)&_header._crc + sizeof(int); | |
| 486 size_t sz = sizeof(FileMapInfo::FileMapHeader) - (buf - header); | |
| 487 int crc = ClassLoader::crc32(0, buf, (jint)sz); | |
| 488 return crc; | |
| 489 } | |
| 0 | 490 |
| 491 bool FileMapInfo::validate() { | |
| 20730 | 492 if (VerifySharedSpaces && compute_header_crc() != _header._crc) { |
| 493 fail_continue("Header checksum verification failed."); | |
| 494 return false; | |
| 495 } | |
| 0 | 496 if (_header._version != current_version()) { |
| 497 fail_continue("The shared archive file is the wrong version."); | |
| 498 return false; | |
| 499 } | |
| 500 if (_header._magic != (int)0xf00baba2) { | |
| 501 fail_continue("The shared archive file has a bad magic number."); | |
| 502 return false; | |
| 503 } | |
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504 char header_version[JVM_IDENT_MAX]; |
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505 get_header_version(header_version); |
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506 if (strncmp(_header._jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { |
| 0 | 507 fail_continue("The shared archive file was created by a different" |
| 508 " version or build of HotSpot."); | |
| 509 return false; | |
| 510 } | |
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511 if (_header._obj_alignment != ObjectAlignmentInBytes) { |
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512 fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" |
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513 " does not equal the current ObjectAlignmentInBytes of %d.", |
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514 _header._obj_alignment, ObjectAlignmentInBytes); |
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515 return false; |
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516 } |
| 0 | 517 |
| 518 // Cannot verify interpreter yet, as it can only be created after the GC | |
| 519 // heap has been initialized. | |
| 520 | |
| 521 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
| 522 fail_continue("Too many jar files to share."); | |
| 523 return false; | |
| 524 } | |
| 525 | |
| 526 // Build checks on classpath and jar files | |
| 527 int num_jars_now = 0; | |
| 528 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
| 529 for ( ; cpe != NULL; cpe = cpe->next()) { | |
| 530 | |
| 531 if (cpe->is_jar_file()) { | |
| 532 if (num_jars_now < _header._num_jars) { | |
| 533 | |
| 534 // Jar file - verify timestamp and file size. | |
| 535 struct stat st; | |
| 536 const char *path = cpe->name(); | |
| 537 if (os::stat(path, &st) != 0) { | |
| 538 fail_continue("Unable to open jar file %s.", path); | |
| 539 return false; | |
| 540 } | |
| 541 if (_header._jar[num_jars_now]._timestamp != st.st_mtime || | |
| 542 _header._jar[num_jars_now]._filesize != st.st_size) { | |
| 543 fail_continue("A jar file is not the one used while building" | |
| 544 " the shared archive file."); | |
| 545 return false; | |
| 546 } | |
| 547 } | |
| 548 ++num_jars_now; | |
| 549 } else { | |
| 550 | |
| 551 // If directories appear in boot classpath, they must be empty to | |
| 552 // avoid having to verify each individual class file. | |
| 553 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
| 554 if (!os::dir_is_empty(name)) { | |
| 555 fail_continue("Boot classpath directory %s is not empty.", name); | |
| 556 return false; | |
| 557 } | |
| 558 } | |
| 559 } | |
| 560 if (num_jars_now < _header._num_jars) { | |
| 561 fail_continue("The number of jar files in the boot classpath is" | |
| 562 " less than the number the shared archive was created with."); | |
| 563 return false; | |
| 564 } | |
| 565 | |
| 566 return true; | |
| 567 } | |
| 568 | |
| 569 // The following method is provided to see whether a given pointer | |
| 570 // falls in the mapped shared space. | |
| 571 // Param: | |
| 572 // p, The given pointer | |
| 573 // Return: | |
| 574 // True if the p is within the mapped shared space, otherwise, false. | |
| 575 bool FileMapInfo::is_in_shared_space(const void* p) { | |
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576 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
| 0 | 577 if (p >= _header._space[i]._base && |
| 578 p < _header._space[i]._base + _header._space[i]._used) { | |
| 579 return true; | |
| 580 } | |
| 581 } | |
| 582 | |
| 583 return false; | |
| 584 } | |
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585 |
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586 void FileMapInfo::print_shared_spaces() { |
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587 gclog_or_tty->print_cr("Shared Spaces:"); |
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588 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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589 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
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590 gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT, |
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591 shared_region_name[i], |
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592 si->_base, si->_base + si->_used); |
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593 } |
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594 } |
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595 |
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596 // Unmap mapped regions of shared space. |
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597 void FileMapInfo::stop_sharing_and_unmap(const char* msg) { |
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598 FileMapInfo *map_info = FileMapInfo::current_info(); |
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599 if (map_info) { |
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600 map_info->fail_continue(msg); |
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601 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
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602 if (map_info->_header._space[i]._base != NULL) { |
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603 map_info->unmap_region(i); |
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604 map_info->_header._space[i]._base = NULL; |
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605 } |
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606 } |
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607 } else if (DumpSharedSpaces) { |
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608 fail_stop(msg, NULL); |
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609 } |
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610 } |