1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/memory/filemap.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,610 @@
1.4 +/*
1.5 + * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/classLoader.hpp"
1.30 +#include "classfile/symbolTable.hpp"
1.31 +#include "classfile/altHashing.hpp"
1.32 +#include "memory/filemap.hpp"
1.33 +#include "runtime/arguments.hpp"
1.34 +#include "runtime/java.hpp"
1.35 +#include "runtime/os.hpp"
1.36 +#include "services/memTracker.hpp"
1.37 +#include "utilities/defaultStream.hpp"
1.38 +
1.39 +# include <sys/stat.h>
1.40 +# include <errno.h>
1.41 +
1.42 +#ifndef O_BINARY // if defined (Win32) use binary files.
1.43 +#define O_BINARY 0 // otherwise do nothing.
1.44 +#endif
1.45 +
1.46 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.47 +
1.48 +extern address JVM_FunctionAtStart();
1.49 +extern address JVM_FunctionAtEnd();
1.50 +
1.51 +// Complain and stop. All error conditions occurring during the writing of
1.52 +// an archive file should stop the process. Unrecoverable errors during
1.53 +// the reading of the archive file should stop the process.
1.54 +
1.55 +static void fail(const char *msg, va_list ap) {
1.56 + // This occurs very early during initialization: tty is not initialized.
1.57 + jio_fprintf(defaultStream::error_stream(),
1.58 + "An error has occurred while processing the"
1.59 + " shared archive file.\n");
1.60 + jio_vfprintf(defaultStream::error_stream(), msg, ap);
1.61 + jio_fprintf(defaultStream::error_stream(), "\n");
1.62 + // Do not change the text of the below message because some tests check for it.
1.63 + vm_exit_during_initialization("Unable to use shared archive.", NULL);
1.64 +}
1.65 +
1.66 +
1.67 +void FileMapInfo::fail_stop(const char *msg, ...) {
1.68 + va_list ap;
1.69 + va_start(ap, msg);
1.70 + fail(msg, ap); // Never returns.
1.71 + va_end(ap); // for completeness.
1.72 +}
1.73 +
1.74 +
1.75 +// Complain and continue. Recoverable errors during the reading of the
1.76 +// archive file may continue (with sharing disabled).
1.77 +//
1.78 +// If we continue, then disable shared spaces and close the file.
1.79 +
1.80 +void FileMapInfo::fail_continue(const char *msg, ...) {
1.81 + va_list ap;
1.82 + va_start(ap, msg);
1.83 + if (RequireSharedSpaces) {
1.84 + fail(msg, ap);
1.85 + }
1.86 + va_end(ap);
1.87 + UseSharedSpaces = false;
1.88 + close();
1.89 +}
1.90 +
1.91 +// Fill in the fileMapInfo structure with data about this VM instance.
1.92 +
1.93 +// This method copies the vm version info into header_version. If the version is too
1.94 +// long then a truncated version, which has a hash code appended to it, is copied.
1.95 +//
1.96 +// Using a template enables this method to verify that header_version is an array of
1.97 +// length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and
1.98 +// the code that reads the CDS file will both use the same size buffer. Hence, will
1.99 +// use identical truncation. This is necessary for matching of truncated versions.
1.100 +template <int N> static void get_header_version(char (&header_version) [N]) {
1.101 + assert(N == JVM_IDENT_MAX, "Bad header_version size");
1.102 +
1.103 + const char *vm_version = VM_Version::internal_vm_info_string();
1.104 + const int version_len = (int)strlen(vm_version);
1.105 +
1.106 + if (version_len < (JVM_IDENT_MAX-1)) {
1.107 + strcpy(header_version, vm_version);
1.108 +
1.109 + } else {
1.110 + // Get the hash value. Use a static seed because the hash needs to return the same
1.111 + // value over multiple jvm invocations.
1.112 + unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len);
1.113 +
1.114 + // Truncate the ident, saving room for the 8 hex character hash value.
1.115 + strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
1.116 +
1.117 + // Append the hash code as eight hex digits.
1.118 + sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash);
1.119 + header_version[JVM_IDENT_MAX-1] = 0; // Null terminate.
1.120 + }
1.121 +}
1.122 +
1.123 +void FileMapInfo::populate_header(size_t alignment) {
1.124 + _header._magic = 0xf00baba2;
1.125 + _header._version = _current_version;
1.126 + _header._alignment = alignment;
1.127 + _header._obj_alignment = ObjectAlignmentInBytes;
1.128 +
1.129 + // The following fields are for sanity checks for whether this archive
1.130 + // will function correctly with this JVM and the bootclasspath it's
1.131 + // invoked with.
1.132 +
1.133 + // JVM version string ... changes on each build.
1.134 + get_header_version(_header._jvm_ident);
1.135 +
1.136 + // Build checks on classpath and jar files
1.137 + _header._num_jars = 0;
1.138 + ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
1.139 + for ( ; cpe != NULL; cpe = cpe->next()) {
1.140 +
1.141 + if (cpe->is_jar_file()) {
1.142 + if (_header._num_jars >= JVM_SHARED_JARS_MAX) {
1.143 + fail_stop("Too many jar files to share.", NULL);
1.144 + }
1.145 +
1.146 + // Jar file - record timestamp and file size.
1.147 + struct stat st;
1.148 + const char *path = cpe->name();
1.149 + if (os::stat(path, &st) != 0) {
1.150 + // If we can't access a jar file in the boot path, then we can't
1.151 + // make assumptions about where classes get loaded from.
1.152 + fail_stop("Unable to open jar file %s.", path);
1.153 + }
1.154 + _header._jar[_header._num_jars]._timestamp = st.st_mtime;
1.155 + _header._jar[_header._num_jars]._filesize = st.st_size;
1.156 + _header._num_jars++;
1.157 + } else {
1.158 +
1.159 + // If directories appear in boot classpath, they must be empty to
1.160 + // avoid having to verify each individual class file.
1.161 + const char* name = ((ClassPathDirEntry*)cpe)->name();
1.162 + if (!os::dir_is_empty(name)) {
1.163 + fail_stop("Boot classpath directory %s is not empty.", name);
1.164 + }
1.165 + }
1.166 + }
1.167 +}
1.168 +
1.169 +
1.170 +// Read the FileMapInfo information from the file.
1.171 +
1.172 +bool FileMapInfo::init_from_file(int fd) {
1.173 +
1.174 + size_t n = read(fd, &_header, sizeof(struct FileMapHeader));
1.175 + if (n != sizeof(struct FileMapHeader)) {
1.176 + fail_continue("Unable to read the file header.");
1.177 + return false;
1.178 + }
1.179 + if (_header._version != current_version()) {
1.180 + fail_continue("The shared archive file has the wrong version.");
1.181 + return false;
1.182 + }
1.183 + size_t len = lseek(fd, 0, SEEK_END);
1.184 + struct FileMapInfo::FileMapHeader::space_info* si =
1.185 + &_header._space[MetaspaceShared::mc];
1.186 + if (si->_file_offset >= len || len - si->_file_offset < si->_used) {
1.187 + fail_continue("The shared archive file has been truncated.");
1.188 + return false;
1.189 + }
1.190 + _file_offset = n;
1.191 + return true;
1.192 +}
1.193 +
1.194 +
1.195 +// Read the FileMapInfo information from the file.
1.196 +bool FileMapInfo::open_for_read() {
1.197 + _full_path = Arguments::GetSharedArchivePath();
1.198 + int fd = open(_full_path, O_RDONLY | O_BINARY, 0);
1.199 + if (fd < 0) {
1.200 + if (errno == ENOENT) {
1.201 + // Not locating the shared archive is ok.
1.202 + fail_continue("Specified shared archive not found.");
1.203 + } else {
1.204 + fail_continue("Failed to open shared archive file (%s).",
1.205 + strerror(errno));
1.206 + }
1.207 + return false;
1.208 + }
1.209 +
1.210 + _fd = fd;
1.211 + _file_open = true;
1.212 + return true;
1.213 +}
1.214 +
1.215 +
1.216 +// Write the FileMapInfo information to the file.
1.217 +
1.218 +void FileMapInfo::open_for_write() {
1.219 + _full_path = Arguments::GetSharedArchivePath();
1.220 + if (PrintSharedSpaces) {
1.221 + tty->print_cr("Dumping shared data to file: ");
1.222 + tty->print_cr(" %s", _full_path);
1.223 + }
1.224 +
1.225 +#ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
1.226 + chmod(_full_path, _S_IREAD | _S_IWRITE);
1.227 +#endif
1.228 +
1.229 + // Use remove() to delete the existing file because, on Unix, this will
1.230 + // allow processes that have it open continued access to the file.
1.231 + remove(_full_path);
1.232 + int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444);
1.233 + if (fd < 0) {
1.234 + fail_stop("Unable to create shared archive file %s.", _full_path);
1.235 + }
1.236 + _fd = fd;
1.237 + _file_offset = 0;
1.238 + _file_open = true;
1.239 +}
1.240 +
1.241 +
1.242 +// Write the header to the file, seek to the next allocation boundary.
1.243 +
1.244 +void FileMapInfo::write_header() {
1.245 + write_bytes_aligned(&_header, sizeof(FileMapHeader));
1.246 +}
1.247 +
1.248 +
1.249 +// Dump shared spaces to file.
1.250 +
1.251 +void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) {
1.252 + align_file_position();
1.253 + size_t used = space->used_bytes_slow(Metaspace::NonClassType);
1.254 + size_t capacity = space->capacity_bytes_slow(Metaspace::NonClassType);
1.255 + struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
1.256 + write_region(i, (char*)space->bottom(), used, capacity, read_only, false);
1.257 +}
1.258 +
1.259 +
1.260 +// Dump region to file.
1.261 +
1.262 +void FileMapInfo::write_region(int region, char* base, size_t size,
1.263 + size_t capacity, bool read_only,
1.264 + bool allow_exec) {
1.265 + struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region];
1.266 +
1.267 + if (_file_open) {
1.268 + guarantee(si->_file_offset == _file_offset, "file offset mismatch.");
1.269 + if (PrintSharedSpaces) {
1.270 + tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT
1.271 + " file offset 0x%6x", region, size, base, _file_offset);
1.272 + }
1.273 + } else {
1.274 + si->_file_offset = _file_offset;
1.275 + }
1.276 + si->_base = base;
1.277 + si->_used = size;
1.278 + si->_capacity = capacity;
1.279 + si->_read_only = read_only;
1.280 + si->_allow_exec = allow_exec;
1.281 + si->_crc = ClassLoader::crc32(0, base, (jint)size);
1.282 + write_bytes_aligned(base, (int)size);
1.283 +}
1.284 +
1.285 +
1.286 +// Dump bytes to file -- at the current file position.
1.287 +
1.288 +void FileMapInfo::write_bytes(const void* buffer, int nbytes) {
1.289 + if (_file_open) {
1.290 + int n = ::write(_fd, buffer, nbytes);
1.291 + if (n != nbytes) {
1.292 + // It is dangerous to leave the corrupted shared archive file around,
1.293 + // close and remove the file. See bug 6372906.
1.294 + close();
1.295 + remove(_full_path);
1.296 + fail_stop("Unable to write to shared archive file.", NULL);
1.297 + }
1.298 + }
1.299 + _file_offset += nbytes;
1.300 +}
1.301 +
1.302 +
1.303 +// Align file position to an allocation unit boundary.
1.304 +
1.305 +void FileMapInfo::align_file_position() {
1.306 + size_t new_file_offset = align_size_up(_file_offset,
1.307 + os::vm_allocation_granularity());
1.308 + if (new_file_offset != _file_offset) {
1.309 + _file_offset = new_file_offset;
1.310 + if (_file_open) {
1.311 + // Seek one byte back from the target and write a byte to insure
1.312 + // that the written file is the correct length.
1.313 + _file_offset -= 1;
1.314 + if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) {
1.315 + fail_stop("Unable to seek.", NULL);
1.316 + }
1.317 + char zero = 0;
1.318 + write_bytes(&zero, 1);
1.319 + }
1.320 + }
1.321 +}
1.322 +
1.323 +
1.324 +// Dump bytes to file -- at the current file position.
1.325 +
1.326 +void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) {
1.327 + align_file_position();
1.328 + write_bytes(buffer, nbytes);
1.329 + align_file_position();
1.330 +}
1.331 +
1.332 +
1.333 +// Close the shared archive file. This does NOT unmap mapped regions.
1.334 +
1.335 +void FileMapInfo::close() {
1.336 + if (_file_open) {
1.337 + if (::close(_fd) < 0) {
1.338 + fail_stop("Unable to close the shared archive file.");
1.339 + }
1.340 + _file_open = false;
1.341 + _fd = -1;
1.342 + }
1.343 +}
1.344 +
1.345 +
1.346 +// JVM/TI RedefineClasses() support:
1.347 +// Remap the shared readonly space to shared readwrite, private.
1.348 +bool FileMapInfo::remap_shared_readonly_as_readwrite() {
1.349 + struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0];
1.350 + if (!si->_read_only) {
1.351 + // the space is already readwrite so we are done
1.352 + return true;
1.353 + }
1.354 + size_t used = si->_used;
1.355 + size_t size = align_size_up(used, os::vm_allocation_granularity());
1.356 + if (!open_for_read()) {
1.357 + return false;
1.358 + }
1.359 + char *base = os::remap_memory(_fd, _full_path, si->_file_offset,
1.360 + si->_base, size, false /* !read_only */,
1.361 + si->_allow_exec);
1.362 + close();
1.363 + if (base == NULL) {
1.364 + fail_continue("Unable to remap shared readonly space (errno=%d).", errno);
1.365 + return false;
1.366 + }
1.367 + if (base != si->_base) {
1.368 + fail_continue("Unable to remap shared readonly space at required address.");
1.369 + return false;
1.370 + }
1.371 + si->_read_only = false;
1.372 + return true;
1.373 +}
1.374 +
1.375 +// Map the whole region at once, assumed to be allocated contiguously.
1.376 +ReservedSpace FileMapInfo::reserve_shared_memory() {
1.377 + struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0];
1.378 + char* requested_addr = si->_base;
1.379 +
1.380 + size_t size = FileMapInfo::shared_spaces_size();
1.381 +
1.382 + // Reserve the space first, then map otherwise map will go right over some
1.383 + // other reserved memory (like the code cache).
1.384 + ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr);
1.385 + if (!rs.is_reserved()) {
1.386 + fail_continue(err_msg("Unable to reserve shared space at required address " INTPTR_FORMAT, requested_addr));
1.387 + return rs;
1.388 + }
1.389 + // the reserved virtual memory is for mapping class data sharing archive
1.390 + MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared);
1.391 +
1.392 + return rs;
1.393 +}
1.394 +
1.395 +// Memory map a region in the address space.
1.396 +static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"};
1.397 +
1.398 +char* FileMapInfo::map_region(int i) {
1.399 + struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
1.400 + size_t used = si->_used;
1.401 + size_t alignment = os::vm_allocation_granularity();
1.402 + size_t size = align_size_up(used, alignment);
1.403 + char *requested_addr = si->_base;
1.404 +
1.405 + // map the contents of the CDS archive in this memory
1.406 + char *base = os::map_memory(_fd, _full_path, si->_file_offset,
1.407 + requested_addr, size, si->_read_only,
1.408 + si->_allow_exec);
1.409 + if (base == NULL || base != si->_base) {
1.410 + fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i]));
1.411 + return NULL;
1.412 + }
1.413 +#ifdef _WINDOWS
1.414 + // This call is Windows-only because the memory_type gets recorded for the other platforms
1.415 + // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows.
1.416 + MemTracker::record_virtual_memory_type((address)base, mtClassShared);
1.417 +#endif
1.418 + return base;
1.419 +}
1.420 +
1.421 +bool FileMapInfo::verify_region_checksum(int i) {
1.422 + if (!VerifySharedSpaces) {
1.423 + return true;
1.424 + }
1.425 + const char* buf = _header._space[i]._base;
1.426 + size_t sz = _header._space[i]._used;
1.427 + int crc = ClassLoader::crc32(0, buf, (jint)sz);
1.428 + if (crc != _header._space[i]._crc) {
1.429 + fail_continue("Checksum verification failed.");
1.430 + return false;
1.431 + }
1.432 + return true;
1.433 +}
1.434 +
1.435 +// Unmap a memory region in the address space.
1.436 +
1.437 +void FileMapInfo::unmap_region(int i) {
1.438 + struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
1.439 + size_t used = si->_used;
1.440 + size_t size = align_size_up(used, os::vm_allocation_granularity());
1.441 + if (!os::unmap_memory(si->_base, size)) {
1.442 + fail_stop("Unable to unmap shared space.");
1.443 + }
1.444 +}
1.445 +
1.446 +
1.447 +void FileMapInfo::assert_mark(bool check) {
1.448 + if (!check) {
1.449 + fail_stop("Mark mismatch while restoring from shared file.", NULL);
1.450 + }
1.451 +}
1.452 +
1.453 +
1.454 +FileMapInfo* FileMapInfo::_current_info = NULL;
1.455 +
1.456 +
1.457 +// Open the shared archive file, read and validate the header
1.458 +// information (version, boot classpath, etc.). If initialization
1.459 +// fails, shared spaces are disabled and the file is closed. [See
1.460 +// fail_continue.]
1.461 +bool FileMapInfo::initialize() {
1.462 + assert(UseSharedSpaces, "UseSharedSpaces expected.");
1.463 +
1.464 + if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) {
1.465 + fail_continue("Tool agent requires sharing to be disabled.");
1.466 + return false;
1.467 + }
1.468 +
1.469 + if (!open_for_read()) {
1.470 + return false;
1.471 + }
1.472 +
1.473 + init_from_file(_fd);
1.474 + if (!validate()) {
1.475 + return false;
1.476 + }
1.477 +
1.478 + SharedReadOnlySize = _header._space[0]._capacity;
1.479 + SharedReadWriteSize = _header._space[1]._capacity;
1.480 + SharedMiscDataSize = _header._space[2]._capacity;
1.481 + SharedMiscCodeSize = _header._space[3]._capacity;
1.482 + return true;
1.483 +}
1.484 +
1.485 +int FileMapInfo::compute_header_crc() {
1.486 + char* header = (char*)&_header;
1.487 + // start computing from the field after _crc
1.488 + char* buf = (char*)&_header._crc + sizeof(int);
1.489 + size_t sz = sizeof(FileMapInfo::FileMapHeader) - (buf - header);
1.490 + int crc = ClassLoader::crc32(0, buf, (jint)sz);
1.491 + return crc;
1.492 +}
1.493 +
1.494 +bool FileMapInfo::validate() {
1.495 + if (VerifySharedSpaces && compute_header_crc() != _header._crc) {
1.496 + fail_continue("Header checksum verification failed.");
1.497 + return false;
1.498 + }
1.499 + if (_header._version != current_version()) {
1.500 + fail_continue("The shared archive file is the wrong version.");
1.501 + return false;
1.502 + }
1.503 + if (_header._magic != (int)0xf00baba2) {
1.504 + fail_continue("The shared archive file has a bad magic number.");
1.505 + return false;
1.506 + }
1.507 + char header_version[JVM_IDENT_MAX];
1.508 + get_header_version(header_version);
1.509 + if (strncmp(_header._jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
1.510 + fail_continue("The shared archive file was created by a different"
1.511 + " version or build of HotSpot.");
1.512 + return false;
1.513 + }
1.514 + if (_header._obj_alignment != ObjectAlignmentInBytes) {
1.515 + fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
1.516 + " does not equal the current ObjectAlignmentInBytes of %d.",
1.517 + _header._obj_alignment, ObjectAlignmentInBytes);
1.518 + return false;
1.519 + }
1.520 +
1.521 + // Cannot verify interpreter yet, as it can only be created after the GC
1.522 + // heap has been initialized.
1.523 +
1.524 + if (_header._num_jars >= JVM_SHARED_JARS_MAX) {
1.525 + fail_continue("Too many jar files to share.");
1.526 + return false;
1.527 + }
1.528 +
1.529 + // Build checks on classpath and jar files
1.530 + int num_jars_now = 0;
1.531 + ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
1.532 + for ( ; cpe != NULL; cpe = cpe->next()) {
1.533 +
1.534 + if (cpe->is_jar_file()) {
1.535 + if (num_jars_now < _header._num_jars) {
1.536 +
1.537 + // Jar file - verify timestamp and file size.
1.538 + struct stat st;
1.539 + const char *path = cpe->name();
1.540 + if (os::stat(path, &st) != 0) {
1.541 + fail_continue("Unable to open jar file %s.", path);
1.542 + return false;
1.543 + }
1.544 + if (_header._jar[num_jars_now]._timestamp != st.st_mtime ||
1.545 + _header._jar[num_jars_now]._filesize != st.st_size) {
1.546 + fail_continue("A jar file is not the one used while building"
1.547 + " the shared archive file.");
1.548 + return false;
1.549 + }
1.550 + }
1.551 + ++num_jars_now;
1.552 + } else {
1.553 +
1.554 + // If directories appear in boot classpath, they must be empty to
1.555 + // avoid having to verify each individual class file.
1.556 + const char* name = ((ClassPathDirEntry*)cpe)->name();
1.557 + if (!os::dir_is_empty(name)) {
1.558 + fail_continue("Boot classpath directory %s is not empty.", name);
1.559 + return false;
1.560 + }
1.561 + }
1.562 + }
1.563 + if (num_jars_now < _header._num_jars) {
1.564 + fail_continue("The number of jar files in the boot classpath is"
1.565 + " less than the number the shared archive was created with.");
1.566 + return false;
1.567 + }
1.568 +
1.569 + return true;
1.570 +}
1.571 +
1.572 +// The following method is provided to see whether a given pointer
1.573 +// falls in the mapped shared space.
1.574 +// Param:
1.575 +// p, The given pointer
1.576 +// Return:
1.577 +// True if the p is within the mapped shared space, otherwise, false.
1.578 +bool FileMapInfo::is_in_shared_space(const void* p) {
1.579 + for (int i = 0; i < MetaspaceShared::n_regions; i++) {
1.580 + if (p >= _header._space[i]._base &&
1.581 + p < _header._space[i]._base + _header._space[i]._used) {
1.582 + return true;
1.583 + }
1.584 + }
1.585 +
1.586 + return false;
1.587 +}
1.588 +
1.589 +void FileMapInfo::print_shared_spaces() {
1.590 + gclog_or_tty->print_cr("Shared Spaces:");
1.591 + for (int i = 0; i < MetaspaceShared::n_regions; i++) {
1.592 + struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
1.593 + gclog_or_tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT,
1.594 + shared_region_name[i],
1.595 + si->_base, si->_base + si->_used);
1.596 + }
1.597 +}
1.598 +
1.599 +// Unmap mapped regions of shared space.
1.600 +void FileMapInfo::stop_sharing_and_unmap(const char* msg) {
1.601 + FileMapInfo *map_info = FileMapInfo::current_info();
1.602 + if (map_info) {
1.603 + map_info->fail_continue(msg);
1.604 + for (int i = 0; i < MetaspaceShared::n_regions; i++) {
1.605 + if (map_info->_header._space[i]._base != NULL) {
1.606 + map_info->unmap_region(i);
1.607 + map_info->_header._space[i]._base = NULL;
1.608 + }
1.609 + }
1.610 + } else if (DumpSharedSpaces) {
1.611 + fail_stop(msg, NULL);
1.612 + }
1.613 +}
