Wed, 26 Jun 2013 16:58:37 +0200
8013590: NPG: Add a memory pool MXBean for Metaspace
Reviewed-by: jmasa, mgerdin
duke@435 | 1 | /* |
hseigel@4521 | 2 | * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #include "precompiled.hpp" |
stefank@2314 | 26 | #include "classfile/classLoader.hpp" |
stefank@2314 | 27 | #include "classfile/symbolTable.hpp" |
hseigel@4293 | 28 | #include "classfile/altHashing.hpp" |
stefank@2314 | 29 | #include "memory/filemap.hpp" |
stefank@2314 | 30 | #include "runtime/arguments.hpp" |
stefank@2314 | 31 | #include "runtime/java.hpp" |
stefank@2314 | 32 | #include "runtime/os.hpp" |
zgu@4193 | 33 | #include "services/memTracker.hpp" |
stefank@2314 | 34 | #include "utilities/defaultStream.hpp" |
stefank@2314 | 35 | |
duke@435 | 36 | # include <sys/stat.h> |
duke@435 | 37 | # include <errno.h> |
duke@435 | 38 | |
duke@435 | 39 | #ifndef O_BINARY // if defined (Win32) use binary files. |
duke@435 | 40 | #define O_BINARY 0 // otherwise do nothing. |
duke@435 | 41 | #endif |
duke@435 | 42 | |
duke@435 | 43 | |
duke@435 | 44 | extern address JVM_FunctionAtStart(); |
duke@435 | 45 | extern address JVM_FunctionAtEnd(); |
duke@435 | 46 | |
twisti@1040 | 47 | // Complain and stop. All error conditions occurring during the writing of |
duke@435 | 48 | // an archive file should stop the process. Unrecoverable errors during |
duke@435 | 49 | // the reading of the archive file should stop the process. |
duke@435 | 50 | |
duke@435 | 51 | static void fail(const char *msg, va_list ap) { |
duke@435 | 52 | // This occurs very early during initialization: tty is not initialized. |
duke@435 | 53 | jio_fprintf(defaultStream::error_stream(), |
twisti@1040 | 54 | "An error has occurred while processing the" |
duke@435 | 55 | " shared archive file.\n"); |
duke@435 | 56 | jio_vfprintf(defaultStream::error_stream(), msg, ap); |
duke@435 | 57 | jio_fprintf(defaultStream::error_stream(), "\n"); |
duke@435 | 58 | vm_exit_during_initialization("Unable to use shared archive.", NULL); |
duke@435 | 59 | } |
duke@435 | 60 | |
duke@435 | 61 | |
duke@435 | 62 | void FileMapInfo::fail_stop(const char *msg, ...) { |
duke@435 | 63 | va_list ap; |
duke@435 | 64 | va_start(ap, msg); |
duke@435 | 65 | fail(msg, ap); // Never returns. |
duke@435 | 66 | va_end(ap); // for completeness. |
duke@435 | 67 | } |
duke@435 | 68 | |
duke@435 | 69 | |
duke@435 | 70 | // Complain and continue. Recoverable errors during the reading of the |
duke@435 | 71 | // archive file may continue (with sharing disabled). |
duke@435 | 72 | // |
duke@435 | 73 | // If we continue, then disable shared spaces and close the file. |
duke@435 | 74 | |
duke@435 | 75 | void FileMapInfo::fail_continue(const char *msg, ...) { |
duke@435 | 76 | va_list ap; |
duke@435 | 77 | va_start(ap, msg); |
duke@435 | 78 | if (RequireSharedSpaces) { |
duke@435 | 79 | fail(msg, ap); |
duke@435 | 80 | } |
duke@435 | 81 | va_end(ap); |
duke@435 | 82 | UseSharedSpaces = false; |
duke@435 | 83 | close(); |
duke@435 | 84 | } |
duke@435 | 85 | |
hseigel@4293 | 86 | // Fill in the fileMapInfo structure with data about this VM instance. |
duke@435 | 87 | |
hseigel@4293 | 88 | // This method copies the vm version info into header_version. If the version is too |
hseigel@4293 | 89 | // long then a truncated version, which has a hash code appended to it, is copied. |
hseigel@4293 | 90 | // |
hseigel@4293 | 91 | // Using a template enables this method to verify that header_version is an array of |
hseigel@4293 | 92 | // length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and |
hseigel@4293 | 93 | // the code that reads the CDS file will both use the same size buffer. Hence, will |
hseigel@4293 | 94 | // use identical truncation. This is necessary for matching of truncated versions. |
hseigel@4293 | 95 | template <int N> static void get_header_version(char (&header_version) [N]) { |
hseigel@4293 | 96 | assert(N == JVM_IDENT_MAX, "Bad header_version size"); |
hseigel@4293 | 97 | |
hseigel@4293 | 98 | const char *vm_version = VM_Version::internal_vm_info_string(); |
hseigel@4293 | 99 | const int version_len = (int)strlen(vm_version); |
hseigel@4293 | 100 | |
hseigel@4293 | 101 | if (version_len < (JVM_IDENT_MAX-1)) { |
hseigel@4293 | 102 | strcpy(header_version, vm_version); |
hseigel@4293 | 103 | |
hseigel@4293 | 104 | } else { |
hseigel@4293 | 105 | // Get the hash value. Use a static seed because the hash needs to return the same |
hseigel@4293 | 106 | // value over multiple jvm invocations. |
hseigel@4293 | 107 | unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len); |
hseigel@4293 | 108 | |
hseigel@4293 | 109 | // Truncate the ident, saving room for the 8 hex character hash value. |
hseigel@4293 | 110 | strncpy(header_version, vm_version, JVM_IDENT_MAX-9); |
hseigel@4293 | 111 | |
hseigel@4293 | 112 | // Append the hash code as eight hex digits. |
hseigel@4293 | 113 | sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash); |
hseigel@4293 | 114 | header_version[JVM_IDENT_MAX-1] = 0; // Null terminate. |
hseigel@4293 | 115 | } |
hseigel@4293 | 116 | } |
duke@435 | 117 | |
duke@435 | 118 | void FileMapInfo::populate_header(size_t alignment) { |
duke@435 | 119 | _header._magic = 0xf00baba2; |
duke@435 | 120 | _header._version = _current_version; |
duke@435 | 121 | _header._alignment = alignment; |
hseigel@4397 | 122 | _header._obj_alignment = ObjectAlignmentInBytes; |
duke@435 | 123 | |
duke@435 | 124 | // The following fields are for sanity checks for whether this archive |
duke@435 | 125 | // will function correctly with this JVM and the bootclasspath it's |
duke@435 | 126 | // invoked with. |
duke@435 | 127 | |
duke@435 | 128 | // JVM version string ... changes on each build. |
hseigel@4293 | 129 | get_header_version(_header._jvm_ident); |
duke@435 | 130 | |
duke@435 | 131 | // Build checks on classpath and jar files |
duke@435 | 132 | _header._num_jars = 0; |
duke@435 | 133 | ClassPathEntry *cpe = ClassLoader::classpath_entry(0); |
duke@435 | 134 | for ( ; cpe != NULL; cpe = cpe->next()) { |
duke@435 | 135 | |
duke@435 | 136 | if (cpe->is_jar_file()) { |
duke@435 | 137 | if (_header._num_jars >= JVM_SHARED_JARS_MAX) { |
duke@435 | 138 | fail_stop("Too many jar files to share.", NULL); |
duke@435 | 139 | } |
duke@435 | 140 | |
duke@435 | 141 | // Jar file - record timestamp and file size. |
duke@435 | 142 | struct stat st; |
duke@435 | 143 | const char *path = cpe->name(); |
duke@435 | 144 | if (os::stat(path, &st) != 0) { |
duke@435 | 145 | // If we can't access a jar file in the boot path, then we can't |
duke@435 | 146 | // make assumptions about where classes get loaded from. |
duke@435 | 147 | fail_stop("Unable to open jar file %s.", path); |
duke@435 | 148 | } |
duke@435 | 149 | _header._jar[_header._num_jars]._timestamp = st.st_mtime; |
duke@435 | 150 | _header._jar[_header._num_jars]._filesize = st.st_size; |
duke@435 | 151 | _header._num_jars++; |
duke@435 | 152 | } else { |
duke@435 | 153 | |
duke@435 | 154 | // If directories appear in boot classpath, they must be empty to |
duke@435 | 155 | // avoid having to verify each individual class file. |
duke@435 | 156 | const char* name = ((ClassPathDirEntry*)cpe)->name(); |
duke@435 | 157 | if (!os::dir_is_empty(name)) { |
duke@435 | 158 | fail_stop("Boot classpath directory %s is not empty.", name); |
duke@435 | 159 | } |
duke@435 | 160 | } |
duke@435 | 161 | } |
duke@435 | 162 | } |
duke@435 | 163 | |
duke@435 | 164 | |
duke@435 | 165 | // Read the FileMapInfo information from the file. |
duke@435 | 166 | |
duke@435 | 167 | bool FileMapInfo::init_from_file(int fd) { |
duke@435 | 168 | |
duke@435 | 169 | size_t n = read(fd, &_header, sizeof(struct FileMapHeader)); |
duke@435 | 170 | if (n != sizeof(struct FileMapHeader)) { |
duke@435 | 171 | fail_continue("Unable to read the file header."); |
duke@435 | 172 | return false; |
duke@435 | 173 | } |
duke@435 | 174 | if (_header._version != current_version()) { |
duke@435 | 175 | fail_continue("The shared archive file has the wrong version."); |
duke@435 | 176 | return false; |
duke@435 | 177 | } |
duke@435 | 178 | _file_offset = (long)n; |
duke@435 | 179 | return true; |
duke@435 | 180 | } |
duke@435 | 181 | |
duke@435 | 182 | |
duke@435 | 183 | // Read the FileMapInfo information from the file. |
duke@435 | 184 | bool FileMapInfo::open_for_read() { |
duke@435 | 185 | _full_path = Arguments::GetSharedArchivePath(); |
duke@435 | 186 | int fd = open(_full_path, O_RDONLY | O_BINARY, 0); |
duke@435 | 187 | if (fd < 0) { |
duke@435 | 188 | if (errno == ENOENT) { |
duke@435 | 189 | // Not locating the shared archive is ok. |
duke@435 | 190 | fail_continue("Specified shared archive not found."); |
duke@435 | 191 | } else { |
duke@435 | 192 | fail_continue("Failed to open shared archive file (%s).", |
duke@435 | 193 | strerror(errno)); |
duke@435 | 194 | } |
duke@435 | 195 | return false; |
duke@435 | 196 | } |
duke@435 | 197 | |
duke@435 | 198 | _fd = fd; |
duke@435 | 199 | _file_open = true; |
duke@435 | 200 | return true; |
duke@435 | 201 | } |
duke@435 | 202 | |
duke@435 | 203 | |
duke@435 | 204 | // Write the FileMapInfo information to the file. |
duke@435 | 205 | |
duke@435 | 206 | void FileMapInfo::open_for_write() { |
duke@435 | 207 | _full_path = Arguments::GetSharedArchivePath(); |
duke@435 | 208 | if (PrintSharedSpaces) { |
duke@435 | 209 | tty->print_cr("Dumping shared data to file: "); |
duke@435 | 210 | tty->print_cr(" %s", _full_path); |
duke@435 | 211 | } |
duke@435 | 212 | |
hseigel@4521 | 213 | #ifdef _WINDOWS // On Windows, need WRITE permission to remove the file. |
hseigel@4521 | 214 | chmod(_full_path, _S_IREAD | _S_IWRITE); |
hseigel@4521 | 215 | #endif |
hseigel@4521 | 216 | |
hseigel@4521 | 217 | // Use remove() to delete the existing file because, on Unix, this will |
hseigel@4521 | 218 | // allow processes that have it open continued access to the file. |
duke@435 | 219 | remove(_full_path); |
duke@435 | 220 | int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); |
duke@435 | 221 | if (fd < 0) { |
duke@435 | 222 | fail_stop("Unable to create shared archive file %s.", _full_path); |
duke@435 | 223 | } |
duke@435 | 224 | _fd = fd; |
duke@435 | 225 | _file_offset = 0; |
duke@435 | 226 | _file_open = true; |
duke@435 | 227 | } |
duke@435 | 228 | |
duke@435 | 229 | |
duke@435 | 230 | // Write the header to the file, seek to the next allocation boundary. |
duke@435 | 231 | |
duke@435 | 232 | void FileMapInfo::write_header() { |
duke@435 | 233 | write_bytes_aligned(&_header, sizeof(FileMapHeader)); |
duke@435 | 234 | } |
duke@435 | 235 | |
duke@435 | 236 | |
duke@435 | 237 | // Dump shared spaces to file. |
duke@435 | 238 | |
coleenp@4037 | 239 | void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) { |
duke@435 | 240 | align_file_position(); |
jmasa@5015 | 241 | size_t used = space->used_bytes_slow(Metaspace::NonClassType); |
jmasa@5015 | 242 | size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType); |
duke@435 | 243 | struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
coleenp@4037 | 244 | write_region(i, (char*)space->bottom(), used, capacity, read_only, false); |
duke@435 | 245 | } |
duke@435 | 246 | |
duke@435 | 247 | |
duke@435 | 248 | // Dump region to file. |
duke@435 | 249 | |
duke@435 | 250 | void FileMapInfo::write_region(int region, char* base, size_t size, |
duke@435 | 251 | size_t capacity, bool read_only, |
duke@435 | 252 | bool allow_exec) { |
duke@435 | 253 | struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region]; |
duke@435 | 254 | |
duke@435 | 255 | if (_file_open) { |
duke@435 | 256 | guarantee(si->_file_offset == _file_offset, "file offset mismatch."); |
duke@435 | 257 | if (PrintSharedSpaces) { |
coleenp@4037 | 258 | tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT |
coleenp@4037 | 259 | " file offset 0x%6x", region, size, base, _file_offset); |
duke@435 | 260 | } |
duke@435 | 261 | } else { |
duke@435 | 262 | si->_file_offset = _file_offset; |
duke@435 | 263 | } |
duke@435 | 264 | si->_base = base; |
duke@435 | 265 | si->_used = size; |
duke@435 | 266 | si->_capacity = capacity; |
duke@435 | 267 | si->_read_only = read_only; |
duke@435 | 268 | si->_allow_exec = allow_exec; |
duke@435 | 269 | write_bytes_aligned(base, (int)size); |
duke@435 | 270 | } |
duke@435 | 271 | |
duke@435 | 272 | |
duke@435 | 273 | // Dump bytes to file -- at the current file position. |
duke@435 | 274 | |
duke@435 | 275 | void FileMapInfo::write_bytes(const void* buffer, int nbytes) { |
duke@435 | 276 | if (_file_open) { |
duke@435 | 277 | int n = ::write(_fd, buffer, nbytes); |
duke@435 | 278 | if (n != nbytes) { |
duke@435 | 279 | // It is dangerous to leave the corrupted shared archive file around, |
duke@435 | 280 | // close and remove the file. See bug 6372906. |
duke@435 | 281 | close(); |
duke@435 | 282 | remove(_full_path); |
duke@435 | 283 | fail_stop("Unable to write to shared archive file.", NULL); |
duke@435 | 284 | } |
duke@435 | 285 | } |
duke@435 | 286 | _file_offset += nbytes; |
duke@435 | 287 | } |
duke@435 | 288 | |
duke@435 | 289 | |
duke@435 | 290 | // Align file position to an allocation unit boundary. |
duke@435 | 291 | |
duke@435 | 292 | void FileMapInfo::align_file_position() { |
duke@435 | 293 | long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); |
duke@435 | 294 | if (new_file_offset != _file_offset) { |
duke@435 | 295 | _file_offset = new_file_offset; |
duke@435 | 296 | if (_file_open) { |
duke@435 | 297 | // Seek one byte back from the target and write a byte to insure |
duke@435 | 298 | // that the written file is the correct length. |
duke@435 | 299 | _file_offset -= 1; |
duke@435 | 300 | if (lseek(_fd, _file_offset, SEEK_SET) < 0) { |
duke@435 | 301 | fail_stop("Unable to seek.", NULL); |
duke@435 | 302 | } |
duke@435 | 303 | char zero = 0; |
duke@435 | 304 | write_bytes(&zero, 1); |
duke@435 | 305 | } |
duke@435 | 306 | } |
duke@435 | 307 | } |
duke@435 | 308 | |
duke@435 | 309 | |
duke@435 | 310 | // Dump bytes to file -- at the current file position. |
duke@435 | 311 | |
duke@435 | 312 | void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { |
duke@435 | 313 | align_file_position(); |
duke@435 | 314 | write_bytes(buffer, nbytes); |
duke@435 | 315 | align_file_position(); |
duke@435 | 316 | } |
duke@435 | 317 | |
duke@435 | 318 | |
duke@435 | 319 | // Close the shared archive file. This does NOT unmap mapped regions. |
duke@435 | 320 | |
duke@435 | 321 | void FileMapInfo::close() { |
duke@435 | 322 | if (_file_open) { |
duke@435 | 323 | if (::close(_fd) < 0) { |
duke@435 | 324 | fail_stop("Unable to close the shared archive file."); |
duke@435 | 325 | } |
duke@435 | 326 | _file_open = false; |
duke@435 | 327 | _fd = -1; |
duke@435 | 328 | } |
duke@435 | 329 | } |
duke@435 | 330 | |
duke@435 | 331 | |
duke@435 | 332 | // JVM/TI RedefineClasses() support: |
duke@435 | 333 | // Remap the shared readonly space to shared readwrite, private. |
duke@435 | 334 | bool FileMapInfo::remap_shared_readonly_as_readwrite() { |
duke@435 | 335 | struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; |
duke@435 | 336 | if (!si->_read_only) { |
duke@435 | 337 | // the space is already readwrite so we are done |
duke@435 | 338 | return true; |
duke@435 | 339 | } |
duke@435 | 340 | size_t used = si->_used; |
duke@435 | 341 | size_t size = align_size_up(used, os::vm_allocation_granularity()); |
duke@435 | 342 | if (!open_for_read()) { |
duke@435 | 343 | return false; |
duke@435 | 344 | } |
duke@435 | 345 | char *base = os::remap_memory(_fd, _full_path, si->_file_offset, |
duke@435 | 346 | si->_base, size, false /* !read_only */, |
duke@435 | 347 | si->_allow_exec); |
duke@435 | 348 | close(); |
duke@435 | 349 | if (base == NULL) { |
duke@435 | 350 | fail_continue("Unable to remap shared readonly space (errno=%d).", errno); |
duke@435 | 351 | return false; |
duke@435 | 352 | } |
duke@435 | 353 | if (base != si->_base) { |
duke@435 | 354 | fail_continue("Unable to remap shared readonly space at required address."); |
duke@435 | 355 | return false; |
duke@435 | 356 | } |
duke@435 | 357 | si->_read_only = false; |
duke@435 | 358 | return true; |
duke@435 | 359 | } |
duke@435 | 360 | |
coleenp@4037 | 361 | // Map the whole region at once, assumed to be allocated contiguously. |
coleenp@4037 | 362 | ReservedSpace FileMapInfo::reserve_shared_memory() { |
coleenp@4037 | 363 | struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; |
coleenp@4037 | 364 | char* requested_addr = si->_base; |
coleenp@4037 | 365 | size_t alignment = os::vm_allocation_granularity(); |
coleenp@4037 | 366 | |
coleenp@4037 | 367 | size_t size = align_size_up(SharedReadOnlySize + SharedReadWriteSize + |
coleenp@4037 | 368 | SharedMiscDataSize + SharedMiscCodeSize, |
coleenp@4037 | 369 | alignment); |
coleenp@4037 | 370 | |
coleenp@4037 | 371 | // Reserve the space first, then map otherwise map will go right over some |
coleenp@4037 | 372 | // other reserved memory (like the code cache). |
coleenp@4037 | 373 | ReservedSpace rs(size, alignment, false, requested_addr); |
coleenp@4037 | 374 | if (!rs.is_reserved()) { |
coleenp@4804 | 375 | fail_continue(err_msg("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr)); |
coleenp@4037 | 376 | return rs; |
coleenp@4037 | 377 | } |
zgu@4193 | 378 | // the reserved virtual memory is for mapping class data sharing archive |
hseigel@4396 | 379 | MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared); |
hseigel@4396 | 380 | |
coleenp@4037 | 381 | return rs; |
coleenp@4037 | 382 | } |
duke@435 | 383 | |
duke@435 | 384 | // Memory map a region in the address space. |
coleenp@4037 | 385 | static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"}; |
duke@435 | 386 | |
coleenp@4037 | 387 | char* FileMapInfo::map_region(int i) { |
duke@435 | 388 | struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
duke@435 | 389 | size_t used = si->_used; |
coleenp@4037 | 390 | size_t alignment = os::vm_allocation_granularity(); |
coleenp@4037 | 391 | size_t size = align_size_up(used, alignment); |
coleenp@4037 | 392 | char *requested_addr = si->_base; |
coleenp@4037 | 393 | |
coleenp@4037 | 394 | // map the contents of the CDS archive in this memory |
duke@435 | 395 | char *base = os::map_memory(_fd, _full_path, si->_file_offset, |
duke@435 | 396 | requested_addr, size, si->_read_only, |
duke@435 | 397 | si->_allow_exec); |
coleenp@4037 | 398 | if (base == NULL || base != si->_base) { |
coleenp@4037 | 399 | fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i])); |
duke@435 | 400 | return NULL; |
duke@435 | 401 | } |
hseigel@4396 | 402 | #ifdef _WINDOWS |
hseigel@4396 | 403 | // This call is Windows-only because the memory_type gets recorded for the other platforms |
hseigel@4396 | 404 | // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows. |
hseigel@4396 | 405 | MemTracker::record_virtual_memory_type((address)base, mtClassShared); |
hseigel@4396 | 406 | #endif |
duke@435 | 407 | return base; |
duke@435 | 408 | } |
duke@435 | 409 | |
duke@435 | 410 | |
duke@435 | 411 | // Unmap a memory region in the address space. |
duke@435 | 412 | |
duke@435 | 413 | void FileMapInfo::unmap_region(int i) { |
duke@435 | 414 | struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; |
duke@435 | 415 | size_t used = si->_used; |
duke@435 | 416 | size_t size = align_size_up(used, os::vm_allocation_granularity()); |
duke@435 | 417 | if (!os::unmap_memory(si->_base, size)) { |
duke@435 | 418 | fail_stop("Unable to unmap shared space."); |
duke@435 | 419 | } |
duke@435 | 420 | } |
duke@435 | 421 | |
duke@435 | 422 | |
duke@435 | 423 | void FileMapInfo::assert_mark(bool check) { |
duke@435 | 424 | if (!check) { |
duke@435 | 425 | fail_stop("Mark mismatch while restoring from shared file.", NULL); |
duke@435 | 426 | } |
duke@435 | 427 | } |
duke@435 | 428 | |
duke@435 | 429 | |
duke@435 | 430 | FileMapInfo* FileMapInfo::_current_info = NULL; |
duke@435 | 431 | |
duke@435 | 432 | |
duke@435 | 433 | // Open the shared archive file, read and validate the header |
duke@435 | 434 | // information (version, boot classpath, etc.). If initialization |
duke@435 | 435 | // fails, shared spaces are disabled and the file is closed. [See |
duke@435 | 436 | // fail_continue.] |
duke@435 | 437 | bool FileMapInfo::initialize() { |
duke@435 | 438 | assert(UseSharedSpaces, "UseSharedSpaces expected."); |
duke@435 | 439 | |
duke@435 | 440 | if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { |
duke@435 | 441 | fail_continue("Tool agent requires sharing to be disabled."); |
duke@435 | 442 | return false; |
duke@435 | 443 | } |
duke@435 | 444 | |
duke@435 | 445 | if (!open_for_read()) { |
duke@435 | 446 | return false; |
duke@435 | 447 | } |
duke@435 | 448 | |
duke@435 | 449 | init_from_file(_fd); |
duke@435 | 450 | if (!validate()) { |
duke@435 | 451 | return false; |
duke@435 | 452 | } |
duke@435 | 453 | |
duke@435 | 454 | SharedReadOnlySize = _header._space[0]._capacity; |
duke@435 | 455 | SharedReadWriteSize = _header._space[1]._capacity; |
duke@435 | 456 | SharedMiscDataSize = _header._space[2]._capacity; |
duke@435 | 457 | SharedMiscCodeSize = _header._space[3]._capacity; |
duke@435 | 458 | return true; |
duke@435 | 459 | } |
duke@435 | 460 | |
duke@435 | 461 | |
duke@435 | 462 | bool FileMapInfo::validate() { |
duke@435 | 463 | if (_header._version != current_version()) { |
duke@435 | 464 | fail_continue("The shared archive file is the wrong version."); |
duke@435 | 465 | return false; |
duke@435 | 466 | } |
duke@435 | 467 | if (_header._magic != (int)0xf00baba2) { |
duke@435 | 468 | fail_continue("The shared archive file has a bad magic number."); |
duke@435 | 469 | return false; |
duke@435 | 470 | } |
hseigel@4293 | 471 | char header_version[JVM_IDENT_MAX]; |
hseigel@4293 | 472 | get_header_version(header_version); |
hseigel@4293 | 473 | if (strncmp(_header._jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) { |
duke@435 | 474 | fail_continue("The shared archive file was created by a different" |
duke@435 | 475 | " version or build of HotSpot."); |
duke@435 | 476 | return false; |
duke@435 | 477 | } |
hseigel@4397 | 478 | if (_header._obj_alignment != ObjectAlignmentInBytes) { |
hseigel@4397 | 479 | fail_continue("The shared archive file's ObjectAlignmentInBytes of %d" |
hseigel@4397 | 480 | " does not equal the current ObjectAlignmentInBytes of %d.", |
hseigel@4397 | 481 | _header._obj_alignment, ObjectAlignmentInBytes); |
hseigel@4397 | 482 | return false; |
hseigel@4397 | 483 | } |
duke@435 | 484 | |
duke@435 | 485 | // Cannot verify interpreter yet, as it can only be created after the GC |
duke@435 | 486 | // heap has been initialized. |
duke@435 | 487 | |
duke@435 | 488 | if (_header._num_jars >= JVM_SHARED_JARS_MAX) { |
duke@435 | 489 | fail_continue("Too many jar files to share."); |
duke@435 | 490 | return false; |
duke@435 | 491 | } |
duke@435 | 492 | |
duke@435 | 493 | // Build checks on classpath and jar files |
duke@435 | 494 | int num_jars_now = 0; |
duke@435 | 495 | ClassPathEntry *cpe = ClassLoader::classpath_entry(0); |
duke@435 | 496 | for ( ; cpe != NULL; cpe = cpe->next()) { |
duke@435 | 497 | |
duke@435 | 498 | if (cpe->is_jar_file()) { |
duke@435 | 499 | if (num_jars_now < _header._num_jars) { |
duke@435 | 500 | |
duke@435 | 501 | // Jar file - verify timestamp and file size. |
duke@435 | 502 | struct stat st; |
duke@435 | 503 | const char *path = cpe->name(); |
duke@435 | 504 | if (os::stat(path, &st) != 0) { |
duke@435 | 505 | fail_continue("Unable to open jar file %s.", path); |
duke@435 | 506 | return false; |
duke@435 | 507 | } |
duke@435 | 508 | if (_header._jar[num_jars_now]._timestamp != st.st_mtime || |
duke@435 | 509 | _header._jar[num_jars_now]._filesize != st.st_size) { |
duke@435 | 510 | fail_continue("A jar file is not the one used while building" |
duke@435 | 511 | " the shared archive file."); |
duke@435 | 512 | return false; |
duke@435 | 513 | } |
duke@435 | 514 | } |
duke@435 | 515 | ++num_jars_now; |
duke@435 | 516 | } else { |
duke@435 | 517 | |
duke@435 | 518 | // If directories appear in boot classpath, they must be empty to |
duke@435 | 519 | // avoid having to verify each individual class file. |
duke@435 | 520 | const char* name = ((ClassPathDirEntry*)cpe)->name(); |
duke@435 | 521 | if (!os::dir_is_empty(name)) { |
duke@435 | 522 | fail_continue("Boot classpath directory %s is not empty.", name); |
duke@435 | 523 | return false; |
duke@435 | 524 | } |
duke@435 | 525 | } |
duke@435 | 526 | } |
duke@435 | 527 | if (num_jars_now < _header._num_jars) { |
duke@435 | 528 | fail_continue("The number of jar files in the boot classpath is" |
duke@435 | 529 | " less than the number the shared archive was created with."); |
duke@435 | 530 | return false; |
duke@435 | 531 | } |
duke@435 | 532 | |
duke@435 | 533 | return true; |
duke@435 | 534 | } |
duke@435 | 535 | |
duke@435 | 536 | // The following method is provided to see whether a given pointer |
duke@435 | 537 | // falls in the mapped shared space. |
duke@435 | 538 | // Param: |
duke@435 | 539 | // p, The given pointer |
duke@435 | 540 | // Return: |
duke@435 | 541 | // True if the p is within the mapped shared space, otherwise, false. |
duke@435 | 542 | bool FileMapInfo::is_in_shared_space(const void* p) { |
coleenp@4037 | 543 | for (int i = 0; i < MetaspaceShared::n_regions; i++) { |
duke@435 | 544 | if (p >= _header._space[i]._base && |
duke@435 | 545 | p < _header._space[i]._base + _header._space[i]._used) { |
duke@435 | 546 | return true; |
duke@435 | 547 | } |
duke@435 | 548 | } |
duke@435 | 549 | |
duke@435 | 550 | return false; |
duke@435 | 551 | } |