Mercurial > hg > graal-compiler
annotate src/share/vm/memory/filemap.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 98cb887364d3 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
605
diff
changeset
|
2 * Copyright (c) 2003, 2006, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
605
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
605
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
605
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_filemap.cpp.incl" | |
| 27 # include <sys/stat.h> | |
| 28 # include <errno.h> | |
| 29 | |
| 30 #ifndef O_BINARY // if defined (Win32) use binary files. | |
| 31 #define O_BINARY 0 // otherwise do nothing. | |
| 32 #endif | |
| 33 | |
| 34 | |
| 35 extern address JVM_FunctionAtStart(); | |
| 36 extern address JVM_FunctionAtEnd(); | |
| 37 | |
| 605 | 38 // Complain and stop. All error conditions occurring during the writing of |
| 0 | 39 // an archive file should stop the process. Unrecoverable errors during |
| 40 // the reading of the archive file should stop the process. | |
| 41 | |
| 42 static void fail(const char *msg, va_list ap) { | |
| 43 // This occurs very early during initialization: tty is not initialized. | |
| 44 jio_fprintf(defaultStream::error_stream(), | |
| 605 | 45 "An error has occurred while processing the" |
| 0 | 46 " shared archive file.\n"); |
| 47 jio_vfprintf(defaultStream::error_stream(), msg, ap); | |
| 48 jio_fprintf(defaultStream::error_stream(), "\n"); | |
| 49 vm_exit_during_initialization("Unable to use shared archive.", NULL); | |
| 50 } | |
| 51 | |
| 52 | |
| 53 void FileMapInfo::fail_stop(const char *msg, ...) { | |
| 54 va_list ap; | |
| 55 va_start(ap, msg); | |
| 56 fail(msg, ap); // Never returns. | |
| 57 va_end(ap); // for completeness. | |
| 58 } | |
| 59 | |
| 60 | |
| 61 // Complain and continue. Recoverable errors during the reading of the | |
| 62 // archive file may continue (with sharing disabled). | |
| 63 // | |
| 64 // If we continue, then disable shared spaces and close the file. | |
| 65 | |
| 66 void FileMapInfo::fail_continue(const char *msg, ...) { | |
| 67 va_list ap; | |
| 68 va_start(ap, msg); | |
| 69 if (RequireSharedSpaces) { | |
| 70 fail(msg, ap); | |
| 71 } | |
| 72 va_end(ap); | |
| 73 UseSharedSpaces = false; | |
| 74 close(); | |
| 75 } | |
| 76 | |
| 77 | |
| 78 // Fill in the fileMapInfo structure with data about this VM instance. | |
| 79 | |
| 80 void FileMapInfo::populate_header(size_t alignment) { | |
| 81 _header._magic = 0xf00baba2; | |
| 82 _header._version = _current_version; | |
| 83 _header._alignment = alignment; | |
| 84 | |
| 85 // The following fields are for sanity checks for whether this archive | |
| 86 // will function correctly with this JVM and the bootclasspath it's | |
| 87 // invoked with. | |
| 88 | |
| 89 // JVM version string ... changes on each build. | |
| 90 const char *vm_version = VM_Version::internal_vm_info_string(); | |
| 91 if (strlen(vm_version) < (JVM_IDENT_MAX-1)) { | |
| 92 strcpy(_header._jvm_ident, vm_version); | |
| 93 } else { | |
| 94 fail_stop("JVM Ident field for shared archive is too long" | |
| 95 " - truncated to <%s>", _header._jvm_ident); | |
| 96 } | |
| 97 | |
| 98 // Build checks on classpath and jar files | |
| 99 _header._num_jars = 0; | |
| 100 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
| 101 for ( ; cpe != NULL; cpe = cpe->next()) { | |
| 102 | |
| 103 if (cpe->is_jar_file()) { | |
| 104 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
| 105 fail_stop("Too many jar files to share.", NULL); | |
| 106 } | |
| 107 | |
| 108 // Jar file - record timestamp and file size. | |
| 109 struct stat st; | |
| 110 const char *path = cpe->name(); | |
| 111 if (os::stat(path, &st) != 0) { | |
| 112 // If we can't access a jar file in the boot path, then we can't | |
| 113 // make assumptions about where classes get loaded from. | |
| 114 fail_stop("Unable to open jar file %s.", path); | |
| 115 } | |
| 116 _header._jar[_header._num_jars]._timestamp = st.st_mtime; | |
| 117 _header._jar[_header._num_jars]._filesize = st.st_size; | |
| 118 _header._num_jars++; | |
| 119 } else { | |
| 120 | |
| 121 // If directories appear in boot classpath, they must be empty to | |
| 122 // avoid having to verify each individual class file. | |
| 123 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
| 124 if (!os::dir_is_empty(name)) { | |
| 125 fail_stop("Boot classpath directory %s is not empty.", name); | |
| 126 } | |
| 127 } | |
| 128 } | |
| 129 } | |
| 130 | |
| 131 | |
| 132 // Read the FileMapInfo information from the file. | |
| 133 | |
| 134 bool FileMapInfo::init_from_file(int fd) { | |
| 135 | |
| 136 size_t n = read(fd, &_header, sizeof(struct FileMapHeader)); | |
| 137 if (n != sizeof(struct FileMapHeader)) { | |
| 138 fail_continue("Unable to read the file header."); | |
| 139 return false; | |
| 140 } | |
| 141 if (_header._version != current_version()) { | |
| 142 fail_continue("The shared archive file has the wrong version."); | |
| 143 return false; | |
| 144 } | |
| 145 _file_offset = (long)n; | |
| 146 return true; | |
| 147 } | |
| 148 | |
| 149 | |
| 150 // Read the FileMapInfo information from the file. | |
| 151 bool FileMapInfo::open_for_read() { | |
| 152 _full_path = Arguments::GetSharedArchivePath(); | |
| 153 int fd = open(_full_path, O_RDONLY | O_BINARY, 0); | |
| 154 if (fd < 0) { | |
| 155 if (errno == ENOENT) { | |
| 156 // Not locating the shared archive is ok. | |
| 157 fail_continue("Specified shared archive not found."); | |
| 158 } else { | |
| 159 fail_continue("Failed to open shared archive file (%s).", | |
| 160 strerror(errno)); | |
| 161 } | |
| 162 return false; | |
| 163 } | |
| 164 | |
| 165 _fd = fd; | |
| 166 _file_open = true; | |
| 167 return true; | |
| 168 } | |
| 169 | |
| 170 | |
| 171 // Write the FileMapInfo information to the file. | |
| 172 | |
| 173 void FileMapInfo::open_for_write() { | |
| 174 _full_path = Arguments::GetSharedArchivePath(); | |
| 175 if (PrintSharedSpaces) { | |
| 176 tty->print_cr("Dumping shared data to file: "); | |
| 177 tty->print_cr(" %s", _full_path); | |
| 178 } | |
| 179 | |
| 180 // Remove the existing file in case another process has it open. | |
| 181 remove(_full_path); | |
| 182 int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); | |
| 183 if (fd < 0) { | |
| 184 fail_stop("Unable to create shared archive file %s.", _full_path); | |
| 185 } | |
| 186 _fd = fd; | |
| 187 _file_offset = 0; | |
| 188 _file_open = true; | |
| 189 } | |
| 190 | |
| 191 | |
| 192 // Write the header to the file, seek to the next allocation boundary. | |
| 193 | |
| 194 void FileMapInfo::write_header() { | |
| 195 write_bytes_aligned(&_header, sizeof(FileMapHeader)); | |
| 196 } | |
| 197 | |
| 198 | |
| 199 // Dump shared spaces to file. | |
| 200 | |
| 201 void FileMapInfo::write_space(int i, CompactibleSpace* space, bool read_only) { | |
| 202 align_file_position(); | |
| 203 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
| 204 write_region(i, (char*)space->bottom(), space->used(), | |
| 205 space->capacity(), read_only, false); | |
| 206 } | |
| 207 | |
| 208 | |
| 209 // Dump region to file. | |
| 210 | |
| 211 void FileMapInfo::write_region(int region, char* base, size_t size, | |
| 212 size_t capacity, bool read_only, | |
| 213 bool allow_exec) { | |
| 214 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region]; | |
| 215 | |
| 216 if (_file_open) { | |
| 217 guarantee(si->_file_offset == _file_offset, "file offset mismatch."); | |
| 218 if (PrintSharedSpaces) { | |
| 219 tty->print_cr("Shared file region %d: 0x%x bytes, addr 0x%x," | |
| 220 " file offset 0x%x", region, size, base, _file_offset); | |
| 221 } | |
| 222 } else { | |
| 223 si->_file_offset = _file_offset; | |
| 224 } | |
| 225 si->_base = base; | |
| 226 si->_used = size; | |
| 227 si->_capacity = capacity; | |
| 228 si->_read_only = read_only; | |
| 229 si->_allow_exec = allow_exec; | |
| 230 write_bytes_aligned(base, (int)size); | |
| 231 } | |
| 232 | |
| 233 | |
| 234 // Dump bytes to file -- at the current file position. | |
| 235 | |
| 236 void FileMapInfo::write_bytes(const void* buffer, int nbytes) { | |
| 237 if (_file_open) { | |
| 238 int n = ::write(_fd, buffer, nbytes); | |
| 239 if (n != nbytes) { | |
| 240 // It is dangerous to leave the corrupted shared archive file around, | |
| 241 // close and remove the file. See bug 6372906. | |
| 242 close(); | |
| 243 remove(_full_path); | |
| 244 fail_stop("Unable to write to shared archive file.", NULL); | |
| 245 } | |
| 246 } | |
| 247 _file_offset += nbytes; | |
| 248 } | |
| 249 | |
| 250 | |
| 251 // Align file position to an allocation unit boundary. | |
| 252 | |
| 253 void FileMapInfo::align_file_position() { | |
| 254 long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); | |
| 255 if (new_file_offset != _file_offset) { | |
| 256 _file_offset = new_file_offset; | |
| 257 if (_file_open) { | |
| 258 // Seek one byte back from the target and write a byte to insure | |
| 259 // that the written file is the correct length. | |
| 260 _file_offset -= 1; | |
| 261 if (lseek(_fd, _file_offset, SEEK_SET) < 0) { | |
| 262 fail_stop("Unable to seek.", NULL); | |
| 263 } | |
| 264 char zero = 0; | |
| 265 write_bytes(&zero, 1); | |
| 266 } | |
| 267 } | |
| 268 } | |
| 269 | |
| 270 | |
| 271 // Dump bytes to file -- at the current file position. | |
| 272 | |
| 273 void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { | |
| 274 align_file_position(); | |
| 275 write_bytes(buffer, nbytes); | |
| 276 align_file_position(); | |
| 277 } | |
| 278 | |
| 279 | |
| 280 // Close the shared archive file. This does NOT unmap mapped regions. | |
| 281 | |
| 282 void FileMapInfo::close() { | |
| 283 if (_file_open) { | |
| 284 if (::close(_fd) < 0) { | |
| 285 fail_stop("Unable to close the shared archive file."); | |
| 286 } | |
| 287 _file_open = false; | |
| 288 _fd = -1; | |
| 289 } | |
| 290 } | |
| 291 | |
| 292 | |
| 293 // Memory map a shared space from the archive file. | |
| 294 | |
| 295 bool FileMapInfo::map_space(int i, ReservedSpace rs, ContiguousSpace* space) { | |
| 296 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
| 297 if (space != NULL) { | |
| 298 if (si->_base != (char*)space->bottom() || | |
| 299 si->_capacity != space->capacity()) { | |
| 300 fail_continue("Shared space base address does not match."); | |
| 301 return false; | |
| 302 } | |
| 303 } | |
| 304 bool result = (map_region(i, rs) != NULL); | |
| 305 if (space != NULL && result) { | |
| 306 space->set_top((HeapWord*)(si->_base + si->_used)); | |
| 307 space->set_saved_mark(); | |
| 308 } | |
| 309 return result; | |
| 310 } | |
| 311 | |
| 312 | |
| 313 // JVM/TI RedefineClasses() support: | |
| 314 // Remap the shared readonly space to shared readwrite, private. | |
| 315 bool FileMapInfo::remap_shared_readonly_as_readwrite() { | |
| 316 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; | |
| 317 if (!si->_read_only) { | |
| 318 // the space is already readwrite so we are done | |
| 319 return true; | |
| 320 } | |
| 321 size_t used = si->_used; | |
| 322 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 323 if (!open_for_read()) { | |
| 324 return false; | |
| 325 } | |
| 326 char *base = os::remap_memory(_fd, _full_path, si->_file_offset, | |
| 327 si->_base, size, false /* !read_only */, | |
| 328 si->_allow_exec); | |
| 329 close(); | |
| 330 if (base == NULL) { | |
| 331 fail_continue("Unable to remap shared readonly space (errno=%d).", errno); | |
| 332 return false; | |
| 333 } | |
| 334 if (base != si->_base) { | |
| 335 fail_continue("Unable to remap shared readonly space at required address."); | |
| 336 return false; | |
| 337 } | |
| 338 si->_read_only = false; | |
| 339 return true; | |
| 340 } | |
| 341 | |
| 342 | |
| 343 // Memory map a region in the address space. | |
| 344 | |
| 345 char* FileMapInfo::map_region(int i, ReservedSpace rs) { | |
| 346 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
| 347 size_t used = si->_used; | |
| 348 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 349 | |
| 350 ReservedSpace mapped_rs = rs.first_part(size, true, true); | |
| 351 ReservedSpace unmapped_rs = rs.last_part(size); | |
| 352 mapped_rs.release(); | |
| 353 | |
| 354 return map_region(i, true); | |
| 355 } | |
| 356 | |
| 357 | |
| 358 // Memory map a region in the address space. | |
| 359 | |
| 360 char* FileMapInfo::map_region(int i, bool address_must_match) { | |
| 361 struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; | |
| 362 size_t used = si->_used; | |
| 363 size_t size = align_size_up(used, os::vm_allocation_granularity()); | |
| 364 char *requested_addr = 0; | |
| 365 if (address_must_match) { | |
| 366 requested_addr = si->_base; | |
| 367 } | |
| 368 char *base = os::map_memory(_fd, _full_path, si->_file_offset, | |
| 369 requested_addr, size, si->_read_only, | |
| 370 si->_allow_exec); | |
| 371 if (base == NULL) { | |
| 372 fail_continue("Unable to map shared space."); | |
| 373 return NULL; | |
| 374 } | |
| 375 if (address_must_match) { | |
| 376 if (base != si->_base) { | |
| 377 fail_continue("Unable to map shared space at required address."); | |
| 378 return NULL; | |
| 379 } | |
| 380 } else { | |
| 381 si->_base = base; // save mapped address for unmapping. | |
| 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 | |
| 414 | |
| 415 bool FileMapInfo::initialize() { | |
| 416 assert(UseSharedSpaces, "UseSharedSpaces expected."); | |
| 417 | |
| 418 if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { | |
| 419 fail_continue("Tool agent requires sharing to be disabled."); | |
| 420 return false; | |
| 421 } | |
| 422 | |
| 423 if (!open_for_read()) { | |
| 424 return false; | |
| 425 } | |
| 426 | |
| 427 init_from_file(_fd); | |
| 428 if (!validate()) { | |
| 429 return false; | |
| 430 } | |
| 431 | |
| 432 SharedReadOnlySize = _header._space[0]._capacity; | |
| 433 SharedReadWriteSize = _header._space[1]._capacity; | |
| 434 SharedMiscDataSize = _header._space[2]._capacity; | |
| 435 SharedMiscCodeSize = _header._space[3]._capacity; | |
| 436 return true; | |
| 437 } | |
| 438 | |
| 439 | |
| 440 bool FileMapInfo::validate() { | |
| 441 if (_header._version != current_version()) { | |
| 442 fail_continue("The shared archive file is the wrong version."); | |
| 443 return false; | |
| 444 } | |
| 445 if (_header._magic != (int)0xf00baba2) { | |
| 446 fail_continue("The shared archive file has a bad magic number."); | |
| 447 return false; | |
| 448 } | |
| 449 if (strncmp(_header._jvm_ident, VM_Version::internal_vm_info_string(), | |
| 450 JVM_IDENT_MAX-1) != 0) { | |
| 451 fail_continue("The shared archive file was created by a different" | |
| 452 " version or build of HotSpot."); | |
| 453 return false; | |
| 454 } | |
| 455 | |
| 456 // Cannot verify interpreter yet, as it can only be created after the GC | |
| 457 // heap has been initialized. | |
| 458 | |
| 459 if (_header._num_jars >= JVM_SHARED_JARS_MAX) { | |
| 460 fail_continue("Too many jar files to share."); | |
| 461 return false; | |
| 462 } | |
| 463 | |
| 464 // Build checks on classpath and jar files | |
| 465 int num_jars_now = 0; | |
| 466 ClassPathEntry *cpe = ClassLoader::classpath_entry(0); | |
| 467 for ( ; cpe != NULL; cpe = cpe->next()) { | |
| 468 | |
| 469 if (cpe->is_jar_file()) { | |
| 470 if (num_jars_now < _header._num_jars) { | |
| 471 | |
| 472 // Jar file - verify timestamp and file size. | |
| 473 struct stat st; | |
| 474 const char *path = cpe->name(); | |
| 475 if (os::stat(path, &st) != 0) { | |
| 476 fail_continue("Unable to open jar file %s.", path); | |
| 477 return false; | |
| 478 } | |
| 479 if (_header._jar[num_jars_now]._timestamp != st.st_mtime || | |
| 480 _header._jar[num_jars_now]._filesize != st.st_size) { | |
| 481 fail_continue("A jar file is not the one used while building" | |
| 482 " the shared archive file."); | |
| 483 return false; | |
| 484 } | |
| 485 } | |
| 486 ++num_jars_now; | |
| 487 } else { | |
| 488 | |
| 489 // If directories appear in boot classpath, they must be empty to | |
| 490 // avoid having to verify each individual class file. | |
| 491 const char* name = ((ClassPathDirEntry*)cpe)->name(); | |
| 492 if (!os::dir_is_empty(name)) { | |
| 493 fail_continue("Boot classpath directory %s is not empty.", name); | |
| 494 return false; | |
| 495 } | |
| 496 } | |
| 497 } | |
| 498 if (num_jars_now < _header._num_jars) { | |
| 499 fail_continue("The number of jar files in the boot classpath is" | |
| 500 " less than the number the shared archive was created with."); | |
| 501 return false; | |
| 502 } | |
| 503 | |
| 504 return true; | |
| 505 } | |
| 506 | |
| 507 // The following method is provided to see whether a given pointer | |
| 508 // falls in the mapped shared space. | |
| 509 // Param: | |
| 510 // p, The given pointer | |
| 511 // Return: | |
| 512 // True if the p is within the mapped shared space, otherwise, false. | |
| 513 bool FileMapInfo::is_in_shared_space(const void* p) { | |
| 514 for (int i = 0; i < CompactingPermGenGen::n_regions; i++) { | |
| 515 if (p >= _header._space[i]._base && | |
| 516 p < _header._space[i]._base + _header._space[i]._used) { | |
| 517 return true; | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 return false; | |
| 522 } |