Mercurial > hg > truffle
annotate src/share/vm/memory/filemap.cpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 828eafbd85cc |
| children | 716c64bda5ba |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2003, 2012, 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" | |
| 28 #include "memory/filemap.hpp" | |
| 29 #include "runtime/arguments.hpp" | |
| 30 #include "runtime/java.hpp" | |
| 31 #include "runtime/os.hpp" | |
| 32 #include "utilities/defaultStream.hpp" | |
| 33 | |
| 0 | 34 # include <sys/stat.h> |
| 35 # include <errno.h> | |
| 36 | |
| 37 #ifndef O_BINARY // if defined (Win32) use binary files. | |
| 38 #define O_BINARY 0 // otherwise do nothing. | |
| 39 #endif | |
| 40 | |
| 41 | |
| 42 extern address JVM_FunctionAtStart(); | |
| 43 extern address JVM_FunctionAtEnd(); | |
| 44 | |
| 605 | 45 // Complain and stop. All error conditions occurring during the writing of |
| 0 | 46 // an archive file should stop the process. Unrecoverable errors during |
| 47 // the reading of the archive file should stop the process. | |
| 48 | |
| 49 static void fail(const char *msg, va_list ap) { | |
| 50 // This occurs very early during initialization: tty is not initialized. | |
| 51 jio_fprintf(defaultStream::error_stream(), | |
| 605 | 52 "An error has occurred while processing the" |
| 0 | 53 " shared archive file.\n"); |
| 54 jio_vfprintf(defaultStream::error_stream(), msg, ap); | |
| 55 jio_fprintf(defaultStream::error_stream(), "\n"); | |
| 56 vm_exit_during_initialization("Unable to use shared archive.", NULL); | |
| 57 } | |
| 58 | |
| 59 | |
| 60 void FileMapInfo::fail_stop(const char *msg, ...) { | |
| 61 va_list ap; | |
| 62 va_start(ap, msg); | |
| 63 fail(msg, ap); // Never returns. | |
| 64 va_end(ap); // for completeness. | |
| 65 } | |
| 66 | |
| 67 | |
| 68 // Complain and continue. Recoverable errors during the reading of the | |
| 69 // archive file may continue (with sharing disabled). | |
| 70 // | |
| 71 // If we continue, then disable shared spaces and close the file. | |
| 72 | |
| 73 void FileMapInfo::fail_continue(const char *msg, ...) { | |
| 74 va_list ap; | |
| 75 va_start(ap, msg); | |
| 76 if (RequireSharedSpaces) { | |
| 77 fail(msg, ap); | |
| 78 } | |
| 79 va_end(ap); | |
| 80 UseSharedSpaces = false; | |
| 81 close(); | |
| 82 } | |
| 83 | |
| 84 | |
| 85 // Fill in the fileMapInfo structure with data about this VM instance. | |
| 86 | |
| 87 void FileMapInfo::populate_header(size_t alignment) { | |
| 88 _header._magic = 0xf00baba2; | |
| 89 _header._version = _current_version; | |
| 90 _header._alignment = alignment; | |
| 91 | |
| 92 // The following fields are for sanity checks for whether this archive | |
| 93 // will function correctly with this JVM and the bootclasspath it's | |
| 94 // invoked with. | |
| 95 | |
| 96 // JVM version string ... changes on each build. | |
| 97 const char *vm_version = VM_Version::internal_vm_info_string(); | |
| 98 if (strlen(vm_version) < (JVM_IDENT_MAX-1)) { | |
| 99 strcpy(_header._jvm_ident, vm_version); | |
| 100 } else { | |
| 101 fail_stop("JVM Ident field for shared archive is too long" | |
| 102 " - truncated to <%s>", _header._jvm_ident); | |
| 103 } | |
| 104 | |
| 105 // Build checks on classpath and jar files | |
| 106 _header._num_jars = 0; | |
| 107 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
| 108 for ( ; cpe != NULL; cpe = cpe->next()) { | |
| 109 | |
| 110 if (cpe->is_jar_file()) { | |
| 111 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
| 112 fail_stop("Too many jar files to share.", NULL); | |
| 113 } | |
| 114 | |
| 115 // Jar file - record timestamp and file size. | |
| 116 struct stat st; | |
| 117 const char *path = cpe->name(); | |
| 118 if (os::stat(path, &st) != 0) { | |
| 119 // If we can't access a jar file in the boot path, then we can't | |
| 120 // make assumptions about where classes get loaded from. | |
| 121 fail_stop("Unable to open jar file %s.", path); | |
| 122 } | |
| 123 _header._jar[_header._num_jars]._timestamp = st.st_mtime; | |
| 124 _header._jar[_header._num_jars]._filesize = st.st_size; | |
| 125 _header._num_jars++; | |
| 126 } else { | |
| 127 | |
| 128 // If directories appear in boot classpath, they must be empty to | |
| 129 // avoid having to verify each individual class file. | |
| 130 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
| 131 if (!os::dir_is_empty(name)) { | |
| 132 fail_stop("Boot classpath directory %s is not empty.", name); | |
| 133 } | |
| 134 } | |
| 135 } | |
| 136 } | |
| 137 | |
| 138 | |
| 139 // Read the FileMapInfo information from the file. | |
| 140 | |
| 141 bool FileMapInfo::init_from_file(int fd) { | |
| 142 | |
| 143 size_t n = read(fd, &_header, sizeof(struct FileMapHeader)); | |
| 144 if (n != sizeof(struct FileMapHeader)) { | |
| 145 fail_continue("Unable to read the file header."); | |
| 146 return false; | |
| 147 } | |
| 148 if (_header._version != current_version()) { | |
| 149 fail_continue("The shared archive file has the wrong version."); | |
| 150 return false; | |
| 151 } | |
| 152 _file_offset = (long)n; | |
| 153 return true; | |
| 154 } | |
| 155 | |
| 156 | |
| 157 // Read the FileMapInfo information from the file. | |
| 158 bool FileMapInfo::open_for_read() { | |
| 159 _full_path = Arguments::GetSharedArchivePath(); | |
| 160 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); | |
| 161 if (fd < 0) { | |
| 162 if (errno == ENOENT) { | |
| 163 // Not locating the shared archive is ok. | |
| 164 fail_continue("Specified shared archive not found."); | |
| 165 } else { | |
| 166 fail_continue("Failed to open shared archive file (%s).", | |
| 167 strerror(errno)); | |
| 168 } | |
| 169 return false; | |
| 170 } | |
| 171 | |
| 172 _fd = fd; | |
| 173 _file_open = true; | |
| 174 return true; | |
| 175 } | |
| 176 | |
| 177 | |
| 178 // Write the FileMapInfo information to the file. | |
| 179 | |
| 180 void FileMapInfo::open_for_write() { | |
| 181 _full_path = Arguments::GetSharedArchivePath(); | |
| 182 if (PrintSharedSpaces) { | |
| 183 tty->print_cr("Dumping shared data to file: "); | |
| 184 tty->print_cr(" %s", _full_path); | |
| 185 } | |
| 186 | |
| 187 // Remove the existing file in case another process has it open. | |
| 188 remove(_full_path); | |
| 189 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); | |
| 190 if (fd < 0) { | |
| 191 fail_stop("Unable to create shared archive file %s.", _full_path); | |
| 192 } | |
| 193 _fd = fd; | |
| 194 _file_offset = 0; | |
| 195 _file_open = true; | |
| 196 } | |
| 197 | |
| 198 | |
| 199 // Write the header to the file, seek to the next allocation boundary. | |
| 200 | |
| 201 void FileMapInfo::write_header() { | |
| 202 write_bytes_aligned(&_header, sizeof(FileMapHeader)); | |
| 203 } | |
| 204 | |
| 205 | |
| 206 // Dump shared spaces to file. | |
| 207 | |
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208 void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) { |
| 0 | 209 align_file_position(); |
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210 size_t used = space->used_words(Metaspace::NonClassType) * BytesPerWord; |
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211 size_t capacity = space->capacity_words(Metaspace::NonClassType) * BytesPerWord; |
| 0 | 212 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
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213 write_region(i, (char*)space->bottom(), used, capacity, read_only, false); |
| 0 | 214 } |
| 215 | |
| 216 | |
| 217 // Dump region to file. | |
| 218 | |
| 219 void FileMapInfo::write_region(int region, char* base, size_t size, | |
| 220 size_t capacity, bool read_only, | |
| 221 bool allow_exec) { | |
| 222 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region]; | |
| 223 | |
| 224 if (_file_open) { | |
| 225 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); | |
| 226 if (PrintSharedSpaces) { | |
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227 tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT |
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228 " file offset 0x%6x", region, size, base, _file_offset); |
| 0 | 229 } |
| 230 } else { | |
| 231 si->_file_offset = _file_offset; | |
| 232 } | |
| 233 si->_base = base; | |
| 234 si->_used = size; | |
| 235 si->_capacity = capacity; | |
| 236 si->_read_only = read_only; | |
| 237 si->_allow_exec = allow_exec; | |
| 238 write_bytes_aligned(base, (int)size); | |
| 239 } | |
| 240 | |
| 241 | |
| 242 // Dump bytes to file -- at the current file position. | |
| 243 | |
| 244 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { | |
| 245 if (_file_open) { | |
| 246 int n = ::write(_fd, buffer, nbytes); | |
| 247 if (n != nbytes) { | |
| 248 // It is dangerous to leave the corrupted shared archive file around, | |
| 249 // close and remove the file. See bug 6372906. | |
| 250 close(); | |
| 251 remove(_full_path); | |
| 252 fail_stop("Unable to write to shared archive file.", NULL); | |
| 253 } | |
| 254 } | |
| 255 _file_offset += nbytes; | |
| 256 } | |
| 257 | |
| 258 | |
| 259 // Align file position to an allocation unit boundary. | |
| 260 | |
| 261 void FileMapInfo::align_file_position() { | |
| 262 long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); | |
| 263 if (new_file_offset != _file_offset) { | |
| 264 _file_offset = new_file_offset; | |
| 265 if (_file_open) { | |
| 266 // Seek one byte back from the target and write a byte to insure | |
| 267 // that the written file is the correct length. | |
| 268 _file_offset -= 1; | |
| 269 if (lseek(_fd, _file_offset, SEEK_SET) < 0) { | |
| 270 fail_stop("Unable to seek.", NULL); | |
| 271 } | |
| 272 char zero = 0; | |
| 273 write_bytes(&zero, 1); | |
| 274 } | |
| 275 } | |
| 276 } | |
| 277 | |
| 278 | |
| 279 // Dump bytes to file -- at the current file position. | |
| 280 | |
| 281 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { | |
| 282 align_file_position(); | |
| 283 write_bytes(buffer, nbytes); | |
| 284 align_file_position(); | |
| 285 } | |
| 286 | |
| 287 | |
| 288 // Close the shared archive file. This does NOT unmap mapped regions. | |
| 289 | |
| 290 void FileMapInfo::close() { | |
| 291 if (_file_open) { | |
| 292 if (::close(_fd) < 0) { | |
| 293 fail_stop("Unable to close the shared archive file."); | |
| 294 } | |
| 295 _file_open = false; | |
| 296 _fd = -1; | |
| 297 } | |
| 298 } | |
| 299 | |
| 300 | |
| 301 // JVM/TI RedefineClasses() support: | |
| 302 // Remap the shared readonly space to shared readwrite, private. | |
| 303 bool FileMapInfo::remap_shared_readonly_as_readwrite() { | |
| 304 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; | |
| 305 if (!si->_read_only) { | |
| 306 // the space is already readwrite so we are done | |
| 307 return true; | |
| 308 } | |
| 309 size_t used = si->_used; | |
| 310 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 311 if (!open_for_read()) { | |
| 312 return false; | |
| 313 } | |
| 314 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, | |
| 315 si->_base, size, false /* !read_only */, | |
| 316 si->_allow_exec); | |
| 317 close(); | |
| 318 if (base == NULL) { | |
| 319 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); | |
| 320 return false; | |
| 321 } | |
| 322 if (base != si->_base) { | |
| 323 fail_continue("Unable to remap shared readonly space at required address."); | |
| 324 return false; | |
| 325 } | |
| 326 si->_read_only = false; | |
| 327 return true; | |
| 328 } | |
| 329 | |
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330 // Map the whole region at once, assumed to be allocated contiguously. |
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331 ReservedSpace FileMapInfo::reserve_shared_memory() { |
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332 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; |
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333 char* requested_addr = si->_base; |
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334 size_t alignment = os::vm_allocation_granularity(); |
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335 |
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336 size_t size = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
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337 SharedMiscDataSize + SharedMiscCodeSize, |
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338 alignment); |
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339 |
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340 // Reserve the space first, then map otherwise map will go right over some |
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341 // other reserved memory (like the code cache). |
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342 ReservedSpace rs(size, alignment, false, requested_addr); |
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343 if (!rs.is_reserved()) { |
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344 fail_continue(err_msg("Unable to reserved shared space at required address " INTPTR_FORMAT, requested_addr)); |
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345 return rs; |
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346 } |
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347 return rs; |
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348 } |
| 0 | 349 |
| 350 // Memory map a region in the address space. | |
| 351 | |
| 352 char* FileMapInfo::map_region(int i, ReservedSpace rs) { | |
| 353 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
| 354 size_t used = si->_used; | |
| 355 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 356 | |
| 357 ReservedSpace mapped_rs = rs.first_part(size, true, true); | |
| 358 ReservedSpace unmapped_rs = rs.last_part(size); | |
| 359 mapped_rs.release(); | |
| 360 | |
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361 return map_region(i); |
| 0 | 362 } |
| 363 | |
| 364 | |
| 365 // Memory map a region in the address space. | |
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366 static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"}; |
| 0 | 367 |
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368 char* FileMapInfo::map_region(int i) { |
| 0 | 369 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
| 370 size_t used = si->_used; | |
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371 size_t alignment = os::vm_allocation_granularity(); |
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372 size_t size = align_size_up(used, alignment); |
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373 char *requested_addr = si->_base; |
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374 |
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375 // map the contents of the CDS archive in this memory |
| 0 | 376 char *base = os::map_memory(_fd, _full_path, si->_file_offset, |
| 377 requested_addr, size, si->_read_only, | |
| 378 si->_allow_exec); | |
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379 if (base == NULL || base != si->_base) { |
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380 fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i])); |
| 0 | 381 return NULL; |
| 382 } | |
| 383 return base; | |
| 384 } | |
| 385 | |
| 386 | |
| 387 // Unmap a memory region in the address space. | |
| 388 | |
| 389 void FileMapInfo::unmap_region(int i) { | |
| 390 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
| 391 size_t used = si->_used; | |
| 392 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 393 if (!os::unmap_memory(si->_base, size)) { | |
| 394 fail_stop("Unable to unmap shared space."); | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 | |
| 399 void FileMapInfo::assert_mark(bool check) { | |
| 400 if (!check) { | |
| 401 fail_stop("Mark mismatch while restoring from shared file.", NULL); | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 | |
| 406 FileMapInfo* FileMapInfo::_current_info = NULL; | |
| 407 | |
| 408 | |
| 409 // Open the shared archive file, read and validate the header | |
| 410 // information (version, boot classpath, etc.). If initialization | |
| 411 // fails, shared spaces are disabled and the file is closed. [See | |
| 412 // fail_continue.] | |
| 413 bool FileMapInfo::initialize() { | |
| 414 assert(UseSharedSpaces, "UseSharedSpaces expected."); | |
| 415 | |
| 416 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { | |
| 417 fail_continue("Tool agent requires sharing to be disabled."); | |
| 418 return false; | |
| 419 } | |
| 420 | |
| 421 if (!open_for_read()) { | |
| 422 return false; | |
| 423 } | |
| 424 | |
| 425 init_from_file(_fd); | |
| 426 if (!validate()) { | |
| 427 return false; | |
| 428 } | |
| 429 | |
| 430 SharedReadOnlySize = _header._space[0]._capacity; | |
| 431 SharedReadWriteSize = _header._space[1]._capacity; | |
| 432 SharedMiscDataSize = _header._space[2]._capacity; | |
| 433 SharedMiscCodeSize = _header._space[3]._capacity; | |
| 434 return true; | |
| 435 } | |
| 436 | |
| 437 | |
| 438 bool FileMapInfo::validate() { | |
| 439 if (_header._version != current_version()) { | |
| 440 fail_continue("The shared archive file is the wrong version."); | |
| 441 return false; | |
| 442 } | |
| 443 if (_header._magic != (int)0xf00baba2) { | |
| 444 fail_continue("The shared archive file has a bad magic number."); | |
| 445 return false; | |
| 446 } | |
| 447 if (strncmp(_header._jvm_ident, VM_Version::internal_vm_info_string(), | |
| 448 JVM_IDENT_MAX-1) != 0) { | |
| 449 fail_continue("The shared archive file was created by a different" | |
| 450 " version or build of HotSpot."); | |
| 451 return false; | |
| 452 } | |
| 453 | |
| 454 // Cannot verify interpreter yet, as it can only be created after the GC | |
| 455 // heap has been initialized. | |
| 456 | |
| 457 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
| 458 fail_continue("Too many jar files to share."); | |
| 459 return false; | |
| 460 } | |
| 461 | |
| 462 // Build checks on classpath and jar files | |
| 463 int num_jars_now = 0; | |
| 464 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
| 465 for ( ; cpe != NULL; cpe = cpe->next()) { | |
| 466 | |
| 467 if (cpe->is_jar_file()) { | |
| 468 if (num_jars_now < _header._num_jars) { | |
| 469 | |
| 470 // Jar file - verify timestamp and file size. | |
| 471 struct stat st; | |
| 472 const char *path = cpe->name(); | |
| 473 if (os::stat(path, &st) != 0) { | |
| 474 fail_continue("Unable to open jar file %s.", path); | |
| 475 return false; | |
| 476 } | |
| 477 if (_header._jar[num_jars_now]._timestamp != st.st_mtime || | |
| 478 _header._jar[num_jars_now]._filesize != st.st_size) { | |
| 479 fail_continue("A jar file is not the one used while building" | |
| 480 " the shared archive file."); | |
| 481 return false; | |
| 482 } | |
| 483 } | |
| 484 ++num_jars_now; | |
| 485 } else { | |
| 486 | |
| 487 // If directories appear in boot classpath, they must be empty to | |
| 488 // avoid having to verify each individual class file. | |
| 489 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
| 490 if (!os::dir_is_empty(name)) { | |
| 491 fail_continue("Boot classpath directory %s is not empty.", name); | |
| 492 return false; | |
| 493 } | |
| 494 } | |
| 495 } | |
| 496 if (num_jars_now < _header._num_jars) { | |
| 497 fail_continue("The number of jar files in the boot classpath is" | |
| 498 " less than the number the shared archive was created with."); | |
| 499 return false; | |
| 500 } | |
| 501 | |
| 502 return true; | |
| 503 } | |
| 504 | |
| 505 // The following method is provided to see whether a given pointer | |
| 506 // falls in the mapped shared space. | |
| 507 // Param: | |
| 508 // p, The given pointer | |
| 509 // Return: | |
| 510 // True if the p is within the mapped shared space, otherwise, false. | |
| 511 bool FileMapInfo::is_in_shared_space(const void* p) { | |
|
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changeset
|
512 for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
| 0 | 513 if (p >= _header._space[i]._base && |
| 514 p < _header._space[i]._base + _header._space[i]._used) { | |
| 515 return true; | |
| 516 } | |
| 517 } | |
| 518 | |
| 519 return false; | |
| 520 } |