duke@435: /*
coleenp@4037:  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "classfile/classLoader.hpp"
stefank@2314: #include "classfile/symbolTable.hpp"
hseigel@4293: #include "classfile/altHashing.hpp"
stefank@2314: #include "memory/filemap.hpp"
stefank@2314: #include "runtime/arguments.hpp"
stefank@2314: #include "runtime/java.hpp"
stefank@2314: #include "runtime/os.hpp"
zgu@4193: #include "services/memTracker.hpp"
stefank@2314: #include "utilities/defaultStream.hpp"
stefank@2314: 
duke@435: # include <sys/stat.h>
duke@435: # include <errno.h>
duke@435: 
duke@435: #ifndef O_BINARY       // if defined (Win32) use binary files.
duke@435: #define O_BINARY 0     // otherwise do nothing.
duke@435: #endif
duke@435: 
duke@435: 
duke@435: extern address JVM_FunctionAtStart();
duke@435: extern address JVM_FunctionAtEnd();
duke@435: 
twisti@1040: // Complain and stop. All error conditions occurring during the writing of
duke@435: // an archive file should stop the process.  Unrecoverable errors during
duke@435: // the reading of the archive file should stop the process.
duke@435: 
duke@435: static void fail(const char *msg, va_list ap) {
duke@435:   // This occurs very early during initialization: tty is not initialized.
duke@435:   jio_fprintf(defaultStream::error_stream(),
twisti@1040:               "An error has occurred while processing the"
duke@435:               " shared archive file.\n");
duke@435:   jio_vfprintf(defaultStream::error_stream(), msg, ap);
duke@435:   jio_fprintf(defaultStream::error_stream(), "\n");
duke@435:   vm_exit_during_initialization("Unable to use shared archive.", NULL);
duke@435: }
duke@435: 
duke@435: 
duke@435: void FileMapInfo::fail_stop(const char *msg, ...) {
duke@435:         va_list ap;
duke@435:   va_start(ap, msg);
duke@435:   fail(msg, ap);        // Never returns.
duke@435:   va_end(ap);           // for completeness.
duke@435: }
duke@435: 
duke@435: 
duke@435: // Complain and continue.  Recoverable errors during the reading of the
duke@435: // archive file may continue (with sharing disabled).
duke@435: //
duke@435: // If we continue, then disable shared spaces and close the file.
duke@435: 
duke@435: void FileMapInfo::fail_continue(const char *msg, ...) {
duke@435:   va_list ap;
duke@435:   va_start(ap, msg);
duke@435:   if (RequireSharedSpaces) {
duke@435:     fail(msg, ap);
duke@435:   }
duke@435:   va_end(ap);
duke@435:   UseSharedSpaces = false;
duke@435:   close();
duke@435: }
duke@435: 
hseigel@4293: // Fill in the fileMapInfo structure with data about this VM instance.
duke@435: 
hseigel@4293: // This method copies the vm version info into header_version.  If the version is too
hseigel@4293: // long then a truncated version, which has a hash code appended to it, is copied.
hseigel@4293: //
hseigel@4293: // Using a template enables this method to verify that header_version is an array of
hseigel@4293: // length JVM_IDENT_MAX.  This ensures that the code that writes to the CDS file and
hseigel@4293: // the code that reads the CDS file will both use the same size buffer.  Hence, will
hseigel@4293: // use identical truncation.  This is necessary for matching of truncated versions.
hseigel@4293: template <int N> static void get_header_version(char (&header_version) [N]) {
hseigel@4293:   assert(N == JVM_IDENT_MAX, "Bad header_version size");
hseigel@4293: 
hseigel@4293:   const char *vm_version = VM_Version::internal_vm_info_string();
hseigel@4293:   const int version_len = (int)strlen(vm_version);
hseigel@4293: 
hseigel@4293:   if (version_len < (JVM_IDENT_MAX-1)) {
hseigel@4293:     strcpy(header_version, vm_version);
hseigel@4293: 
hseigel@4293:   } else {
hseigel@4293:     // Get the hash value.  Use a static seed because the hash needs to return the same
hseigel@4293:     // value over multiple jvm invocations.
hseigel@4293:     unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len);
hseigel@4293: 
hseigel@4293:     // Truncate the ident, saving room for the 8 hex character hash value.
hseigel@4293:     strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
hseigel@4293: 
hseigel@4293:     // Append the hash code as eight hex digits.
hseigel@4293:     sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash);
hseigel@4293:     header_version[JVM_IDENT_MAX-1] = 0;  // Null terminate.
hseigel@4293:   }
hseigel@4293: }
duke@435: 
duke@435: void FileMapInfo::populate_header(size_t alignment) {
duke@435:   _header._magic = 0xf00baba2;
duke@435:   _header._version = _current_version;
duke@435:   _header._alignment = alignment;
hseigel@4397:   _header._obj_alignment = ObjectAlignmentInBytes;
duke@435: 
duke@435:   // The following fields are for sanity checks for whether this archive
duke@435:   // will function correctly with this JVM and the bootclasspath it's
duke@435:   // invoked with.
duke@435: 
duke@435:   // JVM version string ... changes on each build.
hseigel@4293:   get_header_version(_header._jvm_ident);
duke@435: 
duke@435:   // Build checks on classpath and jar files
duke@435:   _header._num_jars = 0;
duke@435:   ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
duke@435:   for ( ; cpe != NULL; cpe = cpe->next()) {
duke@435: 
duke@435:     if (cpe->is_jar_file()) {
duke@435:       if (_header._num_jars >= JVM_SHARED_JARS_MAX) {
duke@435:         fail_stop("Too many jar files to share.", NULL);
duke@435:       }
duke@435: 
duke@435:       // Jar file - record timestamp and file size.
duke@435:       struct stat st;
duke@435:       const char *path = cpe->name();
duke@435:       if (os::stat(path, &st) != 0) {
duke@435:         // If we can't access a jar file in the boot path, then we can't
duke@435:         // make assumptions about where classes get loaded from.
duke@435:         fail_stop("Unable to open jar file %s.", path);
duke@435:       }
duke@435:       _header._jar[_header._num_jars]._timestamp = st.st_mtime;
duke@435:       _header._jar[_header._num_jars]._filesize = st.st_size;
duke@435:       _header._num_jars++;
duke@435:     } else {
duke@435: 
duke@435:       // If directories appear in boot classpath, they must be empty to
duke@435:       // avoid having to verify each individual class file.
duke@435:       const char* name = ((ClassPathDirEntry*)cpe)->name();
duke@435:       if (!os::dir_is_empty(name)) {
duke@435:         fail_stop("Boot classpath directory %s is not empty.", name);
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: // Read the FileMapInfo information from the file.
duke@435: 
duke@435: bool FileMapInfo::init_from_file(int fd) {
duke@435: 
duke@435:   size_t n = read(fd, &_header, sizeof(struct FileMapHeader));
duke@435:   if (n != sizeof(struct FileMapHeader)) {
duke@435:     fail_continue("Unable to read the file header.");
duke@435:     return false;
duke@435:   }
duke@435:   if (_header._version != current_version()) {
duke@435:     fail_continue("The shared archive file has the wrong version.");
duke@435:     return false;
duke@435:   }
duke@435:   _file_offset = (long)n;
duke@435:   return true;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Read the FileMapInfo information from the file.
duke@435: bool FileMapInfo::open_for_read() {
duke@435:   _full_path = Arguments::GetSharedArchivePath();
duke@435:   int fd = open(_full_path, O_RDONLY | O_BINARY, 0);
duke@435:   if (fd < 0) {
duke@435:     if (errno == ENOENT) {
duke@435:       // Not locating the shared archive is ok.
duke@435:       fail_continue("Specified shared archive not found.");
duke@435:     } else {
duke@435:       fail_continue("Failed to open shared archive file (%s).",
duke@435:                     strerror(errno));
duke@435:     }
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   _fd = fd;
duke@435:   _file_open = true;
duke@435:   return true;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Write the FileMapInfo information to the file.
duke@435: 
duke@435: void FileMapInfo::open_for_write() {
duke@435:  _full_path = Arguments::GetSharedArchivePath();
duke@435:   if (PrintSharedSpaces) {
duke@435:     tty->print_cr("Dumping shared data to file: ");
duke@435:     tty->print_cr("   %s", _full_path);
duke@435:   }
duke@435: 
duke@435:   // Remove the existing file in case another process has it open.
duke@435:   remove(_full_path);
hseigel@4396: #ifdef _WINDOWS  // if 0444 is used on Windows, then remove() will fail.
hseigel@4396:   int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0744);
hseigel@4396: #else
duke@435:   int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444);
hseigel@4396: #endif
duke@435:   if (fd < 0) {
duke@435:     fail_stop("Unable to create shared archive file %s.", _full_path);
duke@435:   }
duke@435:   _fd = fd;
duke@435:   _file_offset = 0;
duke@435:   _file_open = true;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Write the header to the file, seek to the next allocation boundary.
duke@435: 
duke@435: void FileMapInfo::write_header() {
duke@435:   write_bytes_aligned(&_header, sizeof(FileMapHeader));
duke@435: }
duke@435: 
duke@435: 
duke@435: // Dump shared spaces to file.
duke@435: 
coleenp@4037: void FileMapInfo::write_space(int i, Metaspace* space, bool read_only) {
duke@435:   align_file_position();
coleenp@4037:   size_t used = space->used_words(Metaspace::NonClassType) * BytesPerWord;
coleenp@4037:   size_t capacity = space->capacity_words(Metaspace::NonClassType) * BytesPerWord;
duke@435:   struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
coleenp@4037:   write_region(i, (char*)space->bottom(), used, capacity, read_only, false);
duke@435: }
duke@435: 
duke@435: 
duke@435: // Dump region to file.
duke@435: 
duke@435: void FileMapInfo::write_region(int region, char* base, size_t size,
duke@435:                                size_t capacity, bool read_only,
duke@435:                                bool allow_exec) {
duke@435:   struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region];
duke@435: 
duke@435:   if (_file_open) {
duke@435:     guarantee(si->_file_offset == _file_offset, "file offset mismatch.");
duke@435:     if (PrintSharedSpaces) {
coleenp@4037:       tty->print_cr("Shared file region %d: 0x%6x bytes, addr " INTPTR_FORMAT
coleenp@4037:                     " file offset 0x%6x", region, size, base, _file_offset);
duke@435:     }
duke@435:   } else {
duke@435:     si->_file_offset = _file_offset;
duke@435:   }
duke@435:   si->_base = base;
duke@435:   si->_used = size;
duke@435:   si->_capacity = capacity;
duke@435:   si->_read_only = read_only;
duke@435:   si->_allow_exec = allow_exec;
duke@435:   write_bytes_aligned(base, (int)size);
duke@435: }
duke@435: 
duke@435: 
duke@435: // Dump bytes to file -- at the current file position.
duke@435: 
duke@435: void FileMapInfo::write_bytes(const void* buffer, int nbytes) {
duke@435:   if (_file_open) {
duke@435:     int n = ::write(_fd, buffer, nbytes);
duke@435:     if (n != nbytes) {
duke@435:       // It is dangerous to leave the corrupted shared archive file around,
duke@435:       // close and remove the file. See bug 6372906.
duke@435:       close();
duke@435:       remove(_full_path);
duke@435:       fail_stop("Unable to write to shared archive file.", NULL);
duke@435:     }
duke@435:   }
duke@435:   _file_offset += nbytes;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Align file position to an allocation unit boundary.
duke@435: 
duke@435: void FileMapInfo::align_file_position() {
duke@435:   long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity());
duke@435:   if (new_file_offset != _file_offset) {
duke@435:     _file_offset = new_file_offset;
duke@435:     if (_file_open) {
duke@435:       // Seek one byte back from the target and write a byte to insure
duke@435:       // that the written file is the correct length.
duke@435:       _file_offset -= 1;
duke@435:       if (lseek(_fd, _file_offset, SEEK_SET) < 0) {
duke@435:         fail_stop("Unable to seek.", NULL);
duke@435:       }
duke@435:       char zero = 0;
duke@435:       write_bytes(&zero, 1);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: // Dump bytes to file -- at the current file position.
duke@435: 
duke@435: void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) {
duke@435:   align_file_position();
duke@435:   write_bytes(buffer, nbytes);
duke@435:   align_file_position();
duke@435: }
duke@435: 
duke@435: 
duke@435: // Close the shared archive file.  This does NOT unmap mapped regions.
duke@435: 
duke@435: void FileMapInfo::close() {
duke@435:   if (_file_open) {
duke@435:     if (::close(_fd) < 0) {
duke@435:       fail_stop("Unable to close the shared archive file.");
duke@435:     }
duke@435:     _file_open = false;
duke@435:     _fd = -1;
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: // JVM/TI RedefineClasses() support:
duke@435: // Remap the shared readonly space to shared readwrite, private.
duke@435: bool FileMapInfo::remap_shared_readonly_as_readwrite() {
duke@435:   struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0];
duke@435:   if (!si->_read_only) {
duke@435:     // the space is already readwrite so we are done
duke@435:     return true;
duke@435:   }
duke@435:   size_t used = si->_used;
duke@435:   size_t size = align_size_up(used, os::vm_allocation_granularity());
duke@435:   if (!open_for_read()) {
duke@435:     return false;
duke@435:   }
duke@435:   char *base = os::remap_memory(_fd, _full_path, si->_file_offset,
duke@435:                                 si->_base, size, false /* !read_only */,
duke@435:                                 si->_allow_exec);
duke@435:   close();
duke@435:   if (base == NULL) {
duke@435:     fail_continue("Unable to remap shared readonly space (errno=%d).", errno);
duke@435:     return false;
duke@435:   }
duke@435:   if (base != si->_base) {
duke@435:     fail_continue("Unable to remap shared readonly space at required address.");
duke@435:     return false;
duke@435:   }
duke@435:   si->_read_only = false;
duke@435:   return true;
duke@435: }
duke@435: 
coleenp@4037: // Map the whole region at once, assumed to be allocated contiguously.
coleenp@4037: ReservedSpace FileMapInfo::reserve_shared_memory() {
coleenp@4037:   struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0];
coleenp@4037:   char* requested_addr = si->_base;
coleenp@4037:   size_t alignment = os::vm_allocation_granularity();
coleenp@4037: 
coleenp@4037:   size_t size = align_size_up(SharedReadOnlySize + SharedReadWriteSize +
coleenp@4037:                               SharedMiscDataSize + SharedMiscCodeSize,
coleenp@4037:                               alignment);
coleenp@4037: 
coleenp@4037:   // Reserve the space first, then map otherwise map will go right over some
coleenp@4037:   // other reserved memory (like the code cache).
coleenp@4037:   ReservedSpace rs(size, alignment, false, requested_addr);
coleenp@4037:   if (!rs.is_reserved()) {
coleenp@4037:     fail_continue(err_msg("Unable to reserved shared space at required address " INTPTR_FORMAT, requested_addr));
coleenp@4037:     return rs;
coleenp@4037:   }
zgu@4193:   // the reserved virtual memory is for mapping class data sharing archive
hseigel@4396:   MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared);
hseigel@4396: 
coleenp@4037:   return rs;
coleenp@4037: }
duke@435: 
duke@435: // Memory map a region in the address space.
coleenp@4037: static const char* shared_region_name[] = { "ReadOnly", "ReadWrite", "MiscData", "MiscCode"};
duke@435: 
coleenp@4037: char* FileMapInfo::map_region(int i) {
duke@435:   struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
duke@435:   size_t used = si->_used;
coleenp@4037:   size_t alignment = os::vm_allocation_granularity();
coleenp@4037:   size_t size = align_size_up(used, alignment);
coleenp@4037:   char *requested_addr = si->_base;
coleenp@4037: 
coleenp@4037:   // map the contents of the CDS archive in this memory
duke@435:   char *base = os::map_memory(_fd, _full_path, si->_file_offset,
duke@435:                               requested_addr, size, si->_read_only,
duke@435:                               si->_allow_exec);
coleenp@4037:   if (base == NULL || base != si->_base) {
coleenp@4037:     fail_continue(err_msg("Unable to map %s shared space at required address.", shared_region_name[i]));
duke@435:     return NULL;
duke@435:   }
hseigel@4396: #ifdef _WINDOWS
hseigel@4396:   // This call is Windows-only because the memory_type gets recorded for the other platforms
hseigel@4396:   // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows.
hseigel@4396:   MemTracker::record_virtual_memory_type((address)base, mtClassShared);
hseigel@4396: #endif
duke@435:   return base;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Unmap a memory region in the address space.
duke@435: 
duke@435: void FileMapInfo::unmap_region(int i) {
duke@435:   struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i];
duke@435:   size_t used = si->_used;
duke@435:   size_t size = align_size_up(used, os::vm_allocation_granularity());
duke@435:   if (!os::unmap_memory(si->_base, size)) {
duke@435:     fail_stop("Unable to unmap shared space.");
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: void FileMapInfo::assert_mark(bool check) {
duke@435:   if (!check) {
duke@435:     fail_stop("Mark mismatch while restoring from shared file.", NULL);
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: FileMapInfo* FileMapInfo::_current_info = NULL;
duke@435: 
duke@435: 
duke@435: // Open the shared archive file, read and validate the header
duke@435: // information (version, boot classpath, etc.).  If initialization
duke@435: // fails, shared spaces are disabled and the file is closed. [See
duke@435: // fail_continue.]
duke@435: bool FileMapInfo::initialize() {
duke@435:   assert(UseSharedSpaces, "UseSharedSpaces expected.");
duke@435: 
duke@435:   if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) {
duke@435:     fail_continue("Tool agent requires sharing to be disabled.");
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   if (!open_for_read()) {
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   init_from_file(_fd);
duke@435:   if (!validate()) {
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   SharedReadOnlySize =  _header._space[0]._capacity;
duke@435:   SharedReadWriteSize = _header._space[1]._capacity;
duke@435:   SharedMiscDataSize =  _header._space[2]._capacity;
duke@435:   SharedMiscCodeSize =  _header._space[3]._capacity;
duke@435:   return true;
duke@435: }
duke@435: 
duke@435: 
duke@435: bool FileMapInfo::validate() {
duke@435:   if (_header._version != current_version()) {
duke@435:     fail_continue("The shared archive file is the wrong version.");
duke@435:     return false;
duke@435:   }
duke@435:   if (_header._magic != (int)0xf00baba2) {
duke@435:     fail_continue("The shared archive file has a bad magic number.");
duke@435:     return false;
duke@435:   }
hseigel@4293:   char header_version[JVM_IDENT_MAX];
hseigel@4293:   get_header_version(header_version);
hseigel@4293:   if (strncmp(_header._jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
duke@435:     fail_continue("The shared archive file was created by a different"
duke@435:                   " version or build of HotSpot.");
duke@435:     return false;
duke@435:   }
hseigel@4397:   if (_header._obj_alignment != ObjectAlignmentInBytes) {
hseigel@4397:     fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
hseigel@4397:                   " does not equal the current ObjectAlignmentInBytes of %d.",
hseigel@4397:                   _header._obj_alignment, ObjectAlignmentInBytes);
hseigel@4397:     return false;
hseigel@4397:   }
duke@435: 
duke@435:   // Cannot verify interpreter yet, as it can only be created after the GC
duke@435:   // heap has been initialized.
duke@435: 
duke@435:   if (_header._num_jars >= JVM_SHARED_JARS_MAX) {
duke@435:     fail_continue("Too many jar files to share.");
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   // Build checks on classpath and jar files
duke@435:   int num_jars_now = 0;
duke@435:   ClassPathEntry *cpe = ClassLoader::classpath_entry(0);
duke@435:   for ( ; cpe != NULL; cpe = cpe->next()) {
duke@435: 
duke@435:     if (cpe->is_jar_file()) {
duke@435:       if (num_jars_now < _header._num_jars) {
duke@435: 
duke@435:         // Jar file - verify timestamp and file size.
duke@435:         struct stat st;
duke@435:         const char *path = cpe->name();
duke@435:         if (os::stat(path, &st) != 0) {
duke@435:           fail_continue("Unable to open jar file %s.", path);
duke@435:           return false;
duke@435:         }
duke@435:         if (_header._jar[num_jars_now]._timestamp != st.st_mtime ||
duke@435:             _header._jar[num_jars_now]._filesize != st.st_size) {
duke@435:           fail_continue("A jar file is not the one used while building"
duke@435:                         " the shared archive file.");
duke@435:           return false;
duke@435:         }
duke@435:       }
duke@435:       ++num_jars_now;
duke@435:     } else {
duke@435: 
duke@435:       // If directories appear in boot classpath, they must be empty to
duke@435:       // avoid having to verify each individual class file.
duke@435:       const char* name = ((ClassPathDirEntry*)cpe)->name();
duke@435:       if (!os::dir_is_empty(name)) {
duke@435:         fail_continue("Boot classpath directory %s is not empty.", name);
duke@435:         return false;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435:   if (num_jars_now < _header._num_jars) {
duke@435:     fail_continue("The number of jar files in the boot classpath is"
duke@435:                   " less than the number the shared archive was created with.");
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   return true;
duke@435: }
duke@435: 
duke@435: // The following method is provided to see whether a given pointer
duke@435: // falls in the mapped shared space.
duke@435: // Param:
duke@435: // p, The given pointer
duke@435: // Return:
duke@435: // True if the p is within the mapped shared space, otherwise, false.
duke@435: bool FileMapInfo::is_in_shared_space(const void* p) {
coleenp@4037:   for (int i = 0; i < MetaspaceShared::n_regions; i++) {
duke@435:     if (p >= _header._space[i]._base &&
duke@435:         p < _header._space[i]._base + _header._space[i]._used) {
duke@435:       return true;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   return false;
duke@435: }