--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/filemap.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,1073 @@
+/*
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/classLoader.hpp"
+#include "classfile/compactHashtable.inline.hpp"
+#include "classfile/sharedClassUtil.hpp"
+#include "classfile/stringTable.hpp"
+#include "classfile/symbolTable.hpp"
+#include "classfile/systemDictionaryShared.hpp"
+#include "classfile/altHashing.hpp"
+#if INCLUDE_ALL_GCS
+#include "gc/g1/g1CollectedHeap.hpp"
+#endif
+#include "logging/log.hpp"
+#include "logging/logStream.hpp"
+#include "logging/logMessage.hpp"
+#include "memory/filemap.hpp"
+#include "memory/metadataFactory.hpp"
+#include "memory/metaspaceClosure.hpp"
+#include "memory/metaspaceShared.hpp"
+#include "memory/oopFactory.hpp"
+#include "oops/objArrayOop.hpp"
+#include "prims/jvm.h"
+#include "prims/jvmtiExport.hpp"
+#include "runtime/arguments.hpp"
+#include "runtime/java.hpp"
+#include "runtime/os.hpp"
+#include "runtime/vm_version.hpp"
+#include "services/memTracker.hpp"
+#include "utilities/align.hpp"
+#include "utilities/defaultStream.hpp"
+
+# include <sys/stat.h>
+# include <errno.h>
+
+#ifndef O_BINARY // if defined (Win32) use binary files.
+#define O_BINARY 0 // otherwise do nothing.
+#endif
+
+extern address JVM_FunctionAtStart();
+extern address JVM_FunctionAtEnd();
+
+// Complain and stop. All error conditions occurring during the writing of
+// an archive file should stop the process. Unrecoverable errors during
+// the reading of the archive file should stop the process.
+
+static void fail(const char *msg, va_list ap) {
+ // This occurs very early during initialization: tty is not initialized.
+ jio_fprintf(defaultStream::error_stream(),
+ "An error has occurred while processing the"
+ " shared archive file.\n");
+ jio_vfprintf(defaultStream::error_stream(), msg, ap);
+ jio_fprintf(defaultStream::error_stream(), "\n");
+ // Do not change the text of the below message because some tests check for it.
+ vm_exit_during_initialization("Unable to use shared archive.", NULL);
+}
+
+
+void FileMapInfo::fail_stop(const char *msg, ...) {
+ va_list ap;
+ va_start(ap, msg);
+ fail(msg, ap); // Never returns.
+ va_end(ap); // for completeness.
+}
+
+
+// Complain and continue. Recoverable errors during the reading of the
+// archive file may continue (with sharing disabled).
+//
+// If we continue, then disable shared spaces and close the file.
+
+void FileMapInfo::fail_continue(const char *msg, ...) {
+ va_list ap;
+ va_start(ap, msg);
+ MetaspaceShared::set_archive_loading_failed();
+ if (PrintSharedArchiveAndExit && _validating_classpath_entry_table) {
+ // If we are doing PrintSharedArchiveAndExit and some of the classpath entries
+ // do not validate, we can still continue "limping" to validate the remaining
+ // entries. No need to quit.
+ tty->print("[");
+ tty->vprint(msg, ap);
+ tty->print_cr("]");
+ } else {
+ if (RequireSharedSpaces) {
+ fail(msg, ap);
+ } else {
+ if (log_is_enabled(Info, cds)) {
+ ResourceMark rm;
+ LogStream ls(Log(cds)::info());
+ ls.print("UseSharedSpaces: ");
+ ls.vprint_cr(msg, ap);
+ }
+ }
+ UseSharedSpaces = false;
+ assert(current_info() != NULL, "singleton must be registered");
+ current_info()->close();
+ }
+ va_end(ap);
+}
+
+// Fill in the fileMapInfo structure with data about this VM instance.
+
+// This method copies the vm version info into header_version. If the version is too
+// long then a truncated version, which has a hash code appended to it, is copied.
+//
+// Using a template enables this method to verify that header_version is an array of
+// length JVM_IDENT_MAX. This ensures that the code that writes to the CDS file and
+// the code that reads the CDS file will both use the same size buffer. Hence, will
+// use identical truncation. This is necessary for matching of truncated versions.
+template <int N> static void get_header_version(char (&header_version) [N]) {
+ assert(N == JVM_IDENT_MAX, "Bad header_version size");
+
+ const char *vm_version = VM_Version::internal_vm_info_string();
+ const int version_len = (int)strlen(vm_version);
+
+ if (version_len < (JVM_IDENT_MAX-1)) {
+ strcpy(header_version, vm_version);
+
+ } else {
+ // Get the hash value. Use a static seed because the hash needs to return the same
+ // value over multiple jvm invocations.
+ unsigned int hash = AltHashing::murmur3_32(8191, (const jbyte*)vm_version, version_len);
+
+ // Truncate the ident, saving room for the 8 hex character hash value.
+ strncpy(header_version, vm_version, JVM_IDENT_MAX-9);
+
+ // Append the hash code as eight hex digits.
+ sprintf(&header_version[JVM_IDENT_MAX-9], "%08x", hash);
+ header_version[JVM_IDENT_MAX-1] = 0; // Null terminate.
+ }
+}
+
+FileMapInfo::FileMapInfo() {
+ assert(_current_info == NULL, "must be singleton"); // not thread safe
+ _current_info = this;
+ memset((void*)this, 0, sizeof(FileMapInfo));
+ _file_offset = 0;
+ _file_open = false;
+ _header = SharedClassUtil::allocate_file_map_header();
+ _header->_version = _invalid_version;
+}
+
+FileMapInfo::~FileMapInfo() {
+ assert(_current_info == this, "must be singleton"); // not thread safe
+ _current_info = NULL;
+}
+
+void FileMapInfo::populate_header(size_t alignment) {
+ _header->populate(this, alignment);
+}
+
+size_t FileMapInfo::FileMapHeader::data_size() {
+ return SharedClassUtil::file_map_header_size() - sizeof(FileMapInfo::FileMapHeaderBase);
+}
+
+void FileMapInfo::FileMapHeader::populate(FileMapInfo* mapinfo, size_t alignment) {
+ _magic = 0xf00baba2;
+ _version = _current_version;
+ _alignment = alignment;
+ _obj_alignment = ObjectAlignmentInBytes;
+ _compact_strings = CompactStrings;
+ _narrow_oop_mode = Universe::narrow_oop_mode();
+ _narrow_oop_shift = Universe::narrow_oop_shift();
+ _max_heap_size = MaxHeapSize;
+ _narrow_klass_base = Universe::narrow_klass_base();
+ _narrow_klass_shift = Universe::narrow_klass_shift();
+ _classpath_entry_table_size = mapinfo->_classpath_entry_table_size;
+ _classpath_entry_table = mapinfo->_classpath_entry_table;
+ _classpath_entry_size = mapinfo->_classpath_entry_size;
+
+ // The following fields are for sanity checks for whether this archive
+ // will function correctly with this JVM and the bootclasspath it's
+ // invoked with.
+
+ // JVM version string ... changes on each build.
+ get_header_version(_jvm_ident);
+}
+
+void SharedClassPathEntry::init(const char* name, TRAPS) {
+ _timestamp = 0;
+ _filesize = 0;
+
+ struct stat st;
+ if (os::stat(name, &st) == 0) {
+ if ((st.st_mode & S_IFMT) == S_IFDIR) {
+ if (!os::dir_is_empty(name)) {
+ ClassLoader::exit_with_path_failure(
+ "Cannot have non-empty directory in archived classpaths", name);
+ }
+ _is_dir = true;
+ } else {
+ _is_dir = false;
+ _timestamp = st.st_mtime;
+ _filesize = st.st_size;
+ }
+ } else {
+ // The file/dir must exist, or it would not have been added
+ // into ClassLoader::classpath_entry().
+ //
+ // If we can't access a jar file in the boot path, then we can't
+ // make assumptions about where classes get loaded from.
+ FileMapInfo::fail_stop("Unable to open file %s.", name);
+ }
+
+ size_t len = strlen(name) + 1;
+ _name = MetadataFactory::new_array<char>(ClassLoaderData::the_null_class_loader_data(), (int)len, THREAD);
+ strcpy(_name->data(), name);
+}
+
+bool SharedClassPathEntry::validate() {
+ struct stat st;
+ const char* name = this->name();
+ bool ok = true;
+ log_info(class, path)("checking shared classpath entry: %s", name);
+ if (os::stat(name, &st) != 0) {
+ FileMapInfo::fail_continue("Required classpath entry does not exist: %s", name);
+ ok = false;
+ } else if (is_dir()) {
+ if (!os::dir_is_empty(name)) {
+ FileMapInfo::fail_continue("directory is not empty: %s", name);
+ ok = false;
+ }
+ } else if (is_jar_or_bootimage()) {
+ if (_timestamp != st.st_mtime ||
+ _filesize != st.st_size) {
+ ok = false;
+ if (PrintSharedArchiveAndExit) {
+ FileMapInfo::fail_continue(_timestamp != st.st_mtime ?
+ "Timestamp mismatch" :
+ "File size mismatch");
+ } else {
+ FileMapInfo::fail_continue("A jar/jimage file is not the one used while building"
+ " the shared archive file: %s", name);
+ }
+ }
+ }
+ return ok;
+}
+
+void SharedClassPathEntry::metaspace_pointers_do(MetaspaceClosure* it) {
+ it->push(&_name);
+ it->push(&_manifest);
+}
+
+void FileMapInfo::allocate_classpath_entry_table() {
+ Thread* THREAD = Thread::current();
+ ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
+ size_t entry_size = SharedClassUtil::shared_class_path_entry_size(); // assert ( should be 8 byte aligned??)
+ int num_entries = ClassLoader::number_of_classpath_entries();
+ size_t bytes = entry_size * num_entries;
+
+ _classpath_entry_table = MetadataFactory::new_array<u8>(loader_data, (int)(bytes + 7 / 8), THREAD);
+ _classpath_entry_table_size = num_entries;
+ _classpath_entry_size = entry_size;
+
+ assert(ClassLoader::get_jrt_entry() != NULL,
+ "No modular java runtime image present when allocating the CDS classpath entry table");
+
+ for (int i=0; i<num_entries; i++) {
+ ClassPathEntry *cpe = ClassLoader::classpath_entry(i);
+ const char* type = ((i == 0) ? "jrt" : (cpe->is_jar_file() ? "jar" : "dir"));
+
+ log_info(class, path)("add main shared path (%s) %s", type, cpe->name());
+ SharedClassPathEntry* ent = shared_classpath(i);
+ ent->init(cpe->name(), THREAD);
+
+ if (i > 0) { // No need to do jimage.
+ EXCEPTION_MARK; // The following call should never throw, but would exit VM on error.
+ SharedClassUtil::update_shared_classpath(cpe, ent, THREAD);
+ }
+ }
+}
+
+bool FileMapInfo::validate_classpath_entry_table() {
+ _validating_classpath_entry_table = true;
+
+ int count = _header->_classpath_entry_table_size;
+
+ _classpath_entry_table = _header->_classpath_entry_table;
+ _classpath_entry_size = _header->_classpath_entry_size;
+ _classpath_entry_table_size = _header->_classpath_entry_table_size;
+
+ for (int i=0; i<count; i++) {
+ if (shared_classpath(i)->validate()) {
+ log_info(class, path)("ok");
+ } else if (!PrintSharedArchiveAndExit) {
+ _validating_classpath_entry_table = false;
+ _classpath_entry_table = NULL;
+ _classpath_entry_table_size = 0;
+ return false;
+ }
+ }
+
+ _validating_classpath_entry_table = false;
+ return true;
+}
+
+
+// Read the FileMapInfo information from the file.
+
+bool FileMapInfo::init_from_file(int fd) {
+ size_t sz = _header->data_size();
+ char* addr = _header->data();
+ size_t n = os::read(fd, addr, (unsigned int)sz);
+ if (n != sz) {
+ fail_continue("Unable to read the file header.");
+ return false;
+ }
+ if (_header->_version != current_version()) {
+ fail_continue("The shared archive file has the wrong version.");
+ return false;
+ }
+ _file_offset = (long)n;
+
+ size_t info_size = _header->_paths_misc_info_size;
+ _paths_misc_info = NEW_C_HEAP_ARRAY_RETURN_NULL(char, info_size, mtClass);
+ if (_paths_misc_info == NULL) {
+ fail_continue("Unable to read the file header.");
+ return false;
+ }
+ n = os::read(fd, _paths_misc_info, (unsigned int)info_size);
+ if (n != info_size) {
+ fail_continue("Unable to read the shared path info header.");
+ FREE_C_HEAP_ARRAY(char, _paths_misc_info);
+ _paths_misc_info = NULL;
+ return false;
+ }
+
+ size_t len = lseek(fd, 0, SEEK_END);
+ struct FileMapInfo::FileMapHeader::space_info* si =
+ &_header->_space[MetaspaceShared::last_valid_region];
+ // The last space might be empty
+ if (si->_file_offset > len || len - si->_file_offset < si->_used) {
+ fail_continue("The shared archive file has been truncated.");
+ return false;
+ }
+
+ _file_offset += (long)n;
+ return true;
+}
+
+
+// Read the FileMapInfo information from the file.
+bool FileMapInfo::open_for_read() {
+ _full_path = Arguments::GetSharedArchivePath();
+ int fd = open(_full_path, O_RDONLY | O_BINARY, 0);
+ if (fd < 0) {
+ if (errno == ENOENT) {
+ // Not locating the shared archive is ok.
+ fail_continue("Specified shared archive not found.");
+ } else {
+ fail_continue("Failed to open shared archive file (%s).",
+ os::strerror(errno));
+ }
+ return false;
+ }
+
+ _fd = fd;
+ _file_open = true;
+ return true;
+}
+
+
+// Write the FileMapInfo information to the file.
+
+void FileMapInfo::open_for_write() {
+ _full_path = Arguments::GetSharedArchivePath();
+ if (log_is_enabled(Info, cds)) {
+ ResourceMark rm;
+ LogMessage(cds) msg;
+ stringStream info_stream;
+ info_stream.print_cr("Dumping shared data to file: ");
+ info_stream.print_cr(" %s", _full_path);
+ msg.info("%s", info_stream.as_string());
+ }
+
+#ifdef _WINDOWS // On Windows, need WRITE permission to remove the file.
+ chmod(_full_path, _S_IREAD | _S_IWRITE);
+#endif
+
+ // Use remove() to delete the existing file because, on Unix, this will
+ // allow processes that have it open continued access to the file.
+ remove(_full_path);
+ int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444);
+ if (fd < 0) {
+ fail_stop("Unable to create shared archive file %s: (%s).", _full_path,
+ os::strerror(errno));
+ }
+ _fd = fd;
+ _file_offset = 0;
+ _file_open = true;
+}
+
+
+// Write the header to the file, seek to the next allocation boundary.
+
+void FileMapInfo::write_header() {
+ int info_size = ClassLoader::get_shared_paths_misc_info_size();
+
+ _header->_paths_misc_info_size = info_size;
+
+ align_file_position();
+ size_t sz = _header->data_size();
+ char* addr = _header->data();
+ write_bytes(addr, (int)sz); // skip the C++ vtable
+ write_bytes(ClassLoader::get_shared_paths_misc_info(), info_size);
+ align_file_position();
+}
+
+
+// Dump region to file.
+
+void FileMapInfo::write_region(int region, char* base, size_t size,
+ bool read_only, bool allow_exec) {
+ struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[region];
+
+ if (_file_open) {
+ guarantee(si->_file_offset == _file_offset, "file offset mismatch.");
+ log_info(cds)("Shared file region %d: " SIZE_FORMAT_HEX_W(08)
+ " bytes, addr " INTPTR_FORMAT " file offset " SIZE_FORMAT_HEX_W(08),
+ region, size, p2i(base), _file_offset);
+ } else {
+ si->_file_offset = _file_offset;
+ }
+ if (MetaspaceShared::is_heap_region(region)) {
+ assert((base - (char*)Universe::narrow_oop_base()) % HeapWordSize == 0, "Sanity");
+ if (base != NULL) {
+ si->_addr._offset = (intx)oopDesc::encode_heap_oop_not_null((oop)base);
+ } else {
+ si->_addr._offset = 0;
+ }
+ } else {
+ si->_addr._base = base;
+ }
+ si->_used = size;
+ si->_read_only = read_only;
+ si->_allow_exec = allow_exec;
+ si->_crc = ClassLoader::crc32(0, base, (jint)size);
+ write_bytes_aligned(base, (int)size);
+}
+
+// Write out the given archive heap memory regions. GC code combines multiple
+// consecutive archive GC regions into one MemRegion whenever possible and
+// produces the 'heap_mem' array.
+//
+// If the archive heap memory size is smaller than a single dump time GC region
+// size, there is only one MemRegion in the array.
+//
+// If the archive heap memory size is bigger than one dump time GC region size,
+// the 'heap_mem' array may contain more than one consolidated MemRegions. When
+// the first/bottom archive GC region is a partial GC region (with the empty
+// portion at the higher address within the region), one MemRegion is used for
+// the bottom partial archive GC region. The rest of the consecutive archive
+// GC regions are combined into another MemRegion.
+//
+// Here's the mapping from (archive heap GC regions) -> (GrowableArray<MemRegion> *regions).
+// + We have 1 or more archive heap regions: ah0, ah1, ah2 ..... ahn
+// + We have 1 or 2 consolidated heap memory regions: r0 and r1
+//
+// If there's a single archive GC region (ah0), then r0 == ah0, and r1 is empty.
+// Otherwise:
+//
+// "X" represented space that's occupied by heap objects.
+// "_" represented unused spaced in the heap region.
+//
+//
+// |ah0 | ah1 | ah2| ...... | ahn |
+// |XXXXXX|__ |XXXXX|XXXX|XXXXXXXX|XXXX|
+// |<-r0->| |<- r1 ----------------->|
+// ^^^
+// |
+// +-- gap
+size_t FileMapInfo::write_archive_heap_regions(GrowableArray<MemRegion> *heap_mem,
+ int first_region_id, int max_num_regions) {
+ assert(max_num_regions <= 2, "Only support maximum 2 memory regions");
+
+ int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
+ if(arr_len > max_num_regions) {
+ fail_stop("Unable to write archive heap memory regions: "
+ "number of memory regions exceeds maximum due to fragmentation");
+ }
+
+ size_t total_size = 0;
+ for (int i = first_region_id, arr_idx = 0;
+ i < first_region_id + max_num_regions;
+ i++, arr_idx++) {
+ char* start = NULL;
+ size_t size = 0;
+ if (arr_idx < arr_len) {
+ start = (char*)heap_mem->at(arr_idx).start();
+ size = heap_mem->at(arr_idx).byte_size();
+ total_size += size;
+ }
+
+ log_info(cds)("Archive heap region %d " INTPTR_FORMAT " - " INTPTR_FORMAT " = " SIZE_FORMAT_W(8) " bytes",
+ i, p2i(start), p2i(start + size), size);
+ write_region(i, start, size, false, false);
+ }
+ return total_size;
+}
+
+// Dump bytes to file -- at the current file position.
+
+void FileMapInfo::write_bytes(const void* buffer, int nbytes) {
+ if (_file_open) {
+ int n = ::write(_fd, buffer, nbytes);
+ if (n != nbytes) {
+ // It is dangerous to leave the corrupted shared archive file around,
+ // close and remove the file. See bug 6372906.
+ close();
+ remove(_full_path);
+ fail_stop("Unable to write to shared archive file.");
+ }
+ }
+ _file_offset += nbytes;
+}
+
+
+// Align file position to an allocation unit boundary.
+
+void FileMapInfo::align_file_position() {
+ size_t new_file_offset = align_up(_file_offset,
+ os::vm_allocation_granularity());
+ if (new_file_offset != _file_offset) {
+ _file_offset = new_file_offset;
+ if (_file_open) {
+ // Seek one byte back from the target and write a byte to insure
+ // that the written file is the correct length.
+ _file_offset -= 1;
+ if (lseek(_fd, (long)_file_offset, SEEK_SET) < 0) {
+ fail_stop("Unable to seek.");
+ }
+ char zero = 0;
+ write_bytes(&zero, 1);
+ }
+ }
+}
+
+
+// Dump bytes to file -- at the current file position.
+
+void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) {
+ align_file_position();
+ write_bytes(buffer, nbytes);
+ align_file_position();
+}
+
+
+// Close the shared archive file. This does NOT unmap mapped regions.
+
+void FileMapInfo::close() {
+ if (_file_open) {
+ if (::close(_fd) < 0) {
+ fail_stop("Unable to close the shared archive file.");
+ }
+ _file_open = false;
+ _fd = -1;
+ }
+}
+
+
+// JVM/TI RedefineClasses() support:
+// Remap the shared readonly space to shared readwrite, private.
+bool FileMapInfo::remap_shared_readonly_as_readwrite() {
+ int idx = MetaspaceShared::ro;
+ struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[idx];
+ if (!si->_read_only) {
+ // the space is already readwrite so we are done
+ return true;
+ }
+ size_t used = si->_used;
+ size_t size = align_up(used, os::vm_allocation_granularity());
+ if (!open_for_read()) {
+ return false;
+ }
+ char *addr = _header->region_addr(idx);
+ char *base = os::remap_memory(_fd, _full_path, si->_file_offset,
+ addr, size, false /* !read_only */,
+ si->_allow_exec);
+ close();
+ if (base == NULL) {
+ fail_continue("Unable to remap shared readonly space (errno=%d).", errno);
+ return false;
+ }
+ if (base != addr) {
+ fail_continue("Unable to remap shared readonly space at required address.");
+ return false;
+ }
+ si->_read_only = false;
+ return true;
+}
+
+// Map the whole region at once, assumed to be allocated contiguously.
+ReservedSpace FileMapInfo::reserve_shared_memory() {
+ char* requested_addr = _header->region_addr(0);
+ size_t size = FileMapInfo::core_spaces_size();
+
+ // Reserve the space first, then map otherwise map will go right over some
+ // other reserved memory (like the code cache).
+ ReservedSpace rs(size, os::vm_allocation_granularity(), false, requested_addr);
+ if (!rs.is_reserved()) {
+ fail_continue("Unable to reserve shared space at required address "
+ INTPTR_FORMAT, p2i(requested_addr));
+ return rs;
+ }
+ // the reserved virtual memory is for mapping class data sharing archive
+ MemTracker::record_virtual_memory_type((address)rs.base(), mtClassShared);
+
+ return rs;
+}
+
+// Memory map a region in the address space.
+static const char* shared_region_name[] = { "MiscData", "ReadWrite", "ReadOnly", "MiscCode", "OptionalData",
+ "String1", "String2", "OpenArchive1", "OpenArchive2" };
+
+char* FileMapInfo::map_region(int i) {
+ assert(!MetaspaceShared::is_heap_region(i), "sanity");
+ struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
+ size_t used = si->_used;
+ size_t alignment = os::vm_allocation_granularity();
+ size_t size = align_up(used, alignment);
+ char *requested_addr = _header->region_addr(i);
+
+ // If a tool agent is in use (debugging enabled), we must map the address space RW
+ if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) {
+ si->_read_only = false;
+ }
+
+ // map the contents of the CDS archive in this memory
+ char *base = os::map_memory(_fd, _full_path, si->_file_offset,
+ requested_addr, size, si->_read_only,
+ si->_allow_exec);
+ if (base == NULL || base != requested_addr) {
+ fail_continue("Unable to map %s shared space at required address.", shared_region_name[i]);
+ return NULL;
+ }
+#ifdef _WINDOWS
+ // This call is Windows-only because the memory_type gets recorded for the other platforms
+ // in method FileMapInfo::reserve_shared_memory(), which is not called on Windows.
+ MemTracker::record_virtual_memory_type((address)base, mtClassShared);
+#endif
+
+ return base;
+}
+
+static MemRegion *string_ranges = NULL;
+static MemRegion *open_archive_heap_ranges = NULL;
+static int num_string_ranges = 0;
+static int num_open_archive_heap_ranges = 0;
+
+#if INCLUDE_CDS_JAVA_HEAP
+//
+// Map the shared string objects and open archive heap objects to the runtime
+// java heap.
+//
+// The shared strings are mapped near the runtime java heap top. The
+// mapped strings contain no out-going references to any other java heap
+// regions. GC does not write into the mapped shared strings.
+//
+// The open archive heap objects are mapped below the shared strings in
+// the runtime java heap. The mapped open archive heap data only contain
+// references to the shared strings and open archive objects initially.
+// During runtime execution, out-going references to any other java heap
+// regions may be added. GC may mark and update references in the mapped
+// open archive objects.
+void FileMapInfo::map_heap_regions() {
+ if (MetaspaceShared::is_heap_object_archiving_allowed()) {
+ // Check that all the narrow oop and klass encodings match the archive
+ if (narrow_oop_mode() != Universe::narrow_oop_mode() ||
+ narrow_oop_shift() != Universe::narrow_oop_shift() ||
+ narrow_klass_base() != Universe::narrow_klass_base() ||
+ narrow_klass_shift() != Universe::narrow_klass_shift()) {
+ if (log_is_enabled(Info, cds) && _header->_space[MetaspaceShared::first_string]._used > 0) {
+ log_info(cds)("Cached heap data from the CDS archive is being ignored. "
+ "The current CompressedOops/CompressedClassPointers encoding differs from "
+ "that archived due to heap size change. The archive was dumped using max heap "
+ "size " UINTX_FORMAT "M.", max_heap_size()/M);
+ }
+ } else {
+ // First, map string regions as closed archive heap regions.
+ // GC does not write into the regions.
+ if (map_heap_data(&string_ranges,
+ MetaspaceShared::first_string,
+ MetaspaceShared::max_strings,
+ &num_string_ranges)) {
+ StringTable::set_shared_string_mapped();
+
+ // Now, map open_archive heap regions, GC can write into the regions.
+ if (map_heap_data(&open_archive_heap_ranges,
+ MetaspaceShared::first_open_archive_heap_region,
+ MetaspaceShared::max_open_archive_heap_region,
+ &num_open_archive_heap_ranges,
+ true /* open */)) {
+ MetaspaceShared::set_open_archive_heap_region_mapped();
+ }
+ }
+ }
+ } else {
+ if (log_is_enabled(Info, cds) && _header->_space[MetaspaceShared::first_string]._used > 0) {
+ log_info(cds)("Cached heap data from the CDS archive is being ignored. UseG1GC, "
+ "UseCompressedOops and UseCompressedClassPointers are required.");
+ }
+ }
+
+ if (!StringTable::shared_string_mapped()) {
+ assert(string_ranges == NULL && num_string_ranges == 0, "sanity");
+ }
+
+ if (!MetaspaceShared::open_archive_heap_region_mapped()) {
+ assert(open_archive_heap_ranges == NULL && num_open_archive_heap_ranges == 0, "sanity");
+ }
+}
+
+bool FileMapInfo::map_heap_data(MemRegion **heap_mem, int first,
+ int max, int* num, bool is_open_archive) {
+ MemRegion * regions = new MemRegion[max];
+ struct FileMapInfo::FileMapHeader::space_info* si;
+ int region_num = 0;
+
+ for (int i = first;
+ i < first + max; i++) {
+ si = &_header->_space[i];
+ size_t used = si->_used;
+ if (used > 0) {
+ size_t size = used;
+ char* requested_addr = (char*)((void*)oopDesc::decode_heap_oop_not_null(
+ (narrowOop)si->_addr._offset));
+ regions[region_num] = MemRegion((HeapWord*)requested_addr, size / HeapWordSize);
+ region_num ++;
+ }
+ }
+
+ if (region_num == 0) {
+ return false; // no archived java heap data
+ }
+
+ // Check that ranges are within the java heap
+ if (!G1CollectedHeap::heap()->check_archive_addresses(regions, region_num)) {
+ log_info(cds)("UseSharedSpaces: Unable to allocate region, "
+ "range is not within java heap.");
+ return false;
+ }
+
+ // allocate from java heap
+ if (!G1CollectedHeap::heap()->alloc_archive_regions(
+ regions, region_num, is_open_archive)) {
+ log_info(cds)("UseSharedSpaces: Unable to allocate region, "
+ "java heap range is already in use.");
+ return false;
+ }
+
+ // Map the archived heap data. No need to call MemTracker::record_virtual_memory_type()
+ // for mapped regions as they are part of the reserved java heap, which is
+ // already recorded.
+ for (int i = 0; i < region_num; i++) {
+ si = &_header->_space[first + i];
+ char* addr = (char*)regions[i].start();
+ char* base = os::map_memory(_fd, _full_path, si->_file_offset,
+ addr, regions[i].byte_size(), si->_read_only,
+ si->_allow_exec);
+ if (base == NULL || base != addr) {
+ // dealloc the regions from java heap
+ dealloc_archive_heap_regions(regions, region_num);
+ log_info(cds)("UseSharedSpaces: Unable to map at required address in java heap.");
+ return false;
+ }
+ }
+
+ if (!verify_mapped_heap_regions(first, region_num)) {
+ // dealloc the regions from java heap
+ dealloc_archive_heap_regions(regions, region_num);
+ log_info(cds)("UseSharedSpaces: mapped heap regions are corrupt");
+ return false;
+ }
+
+ // the shared heap data is mapped successfully
+ *heap_mem = regions;
+ *num = region_num;
+ return true;
+}
+
+bool FileMapInfo::verify_mapped_heap_regions(int first, int num) {
+ for (int i = first;
+ i <= first + num; i++) {
+ if (!verify_region_checksum(i)) {
+ return false;
+ }
+ }
+ return true;
+}
+
+void FileMapInfo::fixup_mapped_heap_regions() {
+ // If any string regions were found, call the fill routine to make them parseable.
+ // Note that string_ranges may be non-NULL even if no ranges were found.
+ if (num_string_ranges != 0) {
+ assert(string_ranges != NULL, "Null string_ranges array with non-zero count");
+ G1CollectedHeap::heap()->fill_archive_regions(string_ranges, num_string_ranges);
+ }
+
+ // do the same for mapped open archive heap regions
+ if (num_open_archive_heap_ranges != 0) {
+ assert(open_archive_heap_ranges != NULL, "NULL open_archive_heap_ranges array with non-zero count");
+ G1CollectedHeap::heap()->fill_archive_regions(open_archive_heap_ranges,
+ num_open_archive_heap_ranges);
+ }
+}
+
+// dealloc the archive regions from java heap
+void FileMapInfo::dealloc_archive_heap_regions(MemRegion* regions, int num) {
+ if (num > 0) {
+ assert(regions != NULL, "Null archive ranges array with non-zero count");
+ G1CollectedHeap::heap()->dealloc_archive_regions(regions, num);
+ }
+}
+#endif // INCLUDE_CDS_JAVA_HEAP
+
+bool FileMapInfo::verify_region_checksum(int i) {
+ if (!VerifySharedSpaces) {
+ return true;
+ }
+
+ size_t sz = _header->_space[i]._used;
+
+ if (sz == 0) {
+ return true; // no data
+ }
+ if ((MetaspaceShared::is_string_region(i) &&
+ !StringTable::shared_string_mapped()) ||
+ (MetaspaceShared::is_open_archive_heap_region(i) &&
+ !MetaspaceShared::open_archive_heap_region_mapped())) {
+ return true; // archived heap data is not mapped
+ }
+ const char* buf = _header->region_addr(i);
+ int crc = ClassLoader::crc32(0, buf, (jint)sz);
+ if (crc != _header->_space[i]._crc) {
+ fail_continue("Checksum verification failed.");
+ return false;
+ }
+ return true;
+}
+
+// Unmap a memory region in the address space.
+
+void FileMapInfo::unmap_region(int i) {
+ assert(!MetaspaceShared::is_heap_region(i), "sanity");
+ struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
+ size_t used = si->_used;
+ size_t size = align_up(used, os::vm_allocation_granularity());
+
+ if (used == 0) {
+ return;
+ }
+
+ char* addr = _header->region_addr(i);
+ if (!os::unmap_memory(addr, size)) {
+ fail_stop("Unable to unmap shared space.");
+ }
+}
+
+void FileMapInfo::assert_mark(bool check) {
+ if (!check) {
+ fail_stop("Mark mismatch while restoring from shared file.");
+ }
+}
+
+void FileMapInfo::metaspace_pointers_do(MetaspaceClosure* it) {
+ it->push(&_classpath_entry_table);
+ for (int i=0; i<_classpath_entry_table_size; i++) {
+ shared_classpath(i)->metaspace_pointers_do(it);
+ }
+}
+
+
+FileMapInfo* FileMapInfo::_current_info = NULL;
+Array<u8>* FileMapInfo::_classpath_entry_table = NULL;
+int FileMapInfo::_classpath_entry_table_size = 0;
+size_t FileMapInfo::_classpath_entry_size = 0x1234baad;
+bool FileMapInfo::_validating_classpath_entry_table = false;
+
+// Open the shared archive file, read and validate the header
+// information (version, boot classpath, etc.). If initialization
+// fails, shared spaces are disabled and the file is closed. [See
+// fail_continue.]
+//
+// Validation of the archive is done in two steps:
+//
+// [1] validate_header() - done here. This checks the header, including _paths_misc_info.
+// [2] validate_classpath_entry_table - this is done later, because the table is in the RW
+// region of the archive, which is not mapped yet.
+bool FileMapInfo::initialize() {
+ assert(UseSharedSpaces, "UseSharedSpaces expected.");
+
+ if (!open_for_read()) {
+ return false;
+ }
+
+ init_from_file(_fd);
+ if (!validate_header()) {
+ return false;
+ }
+ return true;
+}
+
+char* FileMapInfo::FileMapHeader::region_addr(int idx) {
+ if (MetaspaceShared::is_heap_region(idx)) {
+ return _space[idx]._used > 0 ?
+ (char*)((void*)oopDesc::decode_heap_oop_not_null((narrowOop)_space[idx]._addr._offset)) : NULL;
+ } else {
+ return _space[idx]._addr._base;
+ }
+}
+
+int FileMapInfo::FileMapHeader::compute_crc() {
+ char* header = data();
+ // start computing from the field after _crc
+ char* buf = (char*)&_crc + sizeof(int);
+ size_t sz = data_size() - (buf - header);
+ int crc = ClassLoader::crc32(0, buf, (jint)sz);
+ return crc;
+}
+
+bool FileMapInfo::FileMapHeader::validate() {
+ if (VerifySharedSpaces && compute_crc() != _crc) {
+ fail_continue("Header checksum verification failed.");
+ return false;
+ }
+
+ if (!Arguments::has_jimage()) {
+ FileMapInfo::fail_continue("The shared archive file cannot be used with an exploded module build.");
+ return false;
+ }
+
+ if (_version != current_version()) {
+ FileMapInfo::fail_continue("The shared archive file is the wrong version.");
+ return false;
+ }
+ if (_magic != (int)0xf00baba2) {
+ FileMapInfo::fail_continue("The shared archive file has a bad magic number.");
+ return false;
+ }
+ char header_version[JVM_IDENT_MAX];
+ get_header_version(header_version);
+ if (strncmp(_jvm_ident, header_version, JVM_IDENT_MAX-1) != 0) {
+ log_info(class, path)("expected: %s", header_version);
+ log_info(class, path)("actual: %s", _jvm_ident);
+ FileMapInfo::fail_continue("The shared archive file was created by a different"
+ " version or build of HotSpot");
+ return false;
+ }
+ if (_obj_alignment != ObjectAlignmentInBytes) {
+ FileMapInfo::fail_continue("The shared archive file's ObjectAlignmentInBytes of %d"
+ " does not equal the current ObjectAlignmentInBytes of " INTX_FORMAT ".",
+ _obj_alignment, ObjectAlignmentInBytes);
+ return false;
+ }
+ if (_compact_strings != CompactStrings) {
+ FileMapInfo::fail_continue("The shared archive file's CompactStrings setting (%s)"
+ " does not equal the current CompactStrings setting (%s).",
+ _compact_strings ? "enabled" : "disabled",
+ CompactStrings ? "enabled" : "disabled");
+ return false;
+ }
+
+ return true;
+}
+
+bool FileMapInfo::validate_header() {
+ bool status = _header->validate();
+
+ if (status) {
+ if (!ClassLoader::check_shared_paths_misc_info(_paths_misc_info, _header->_paths_misc_info_size)) {
+ if (!PrintSharedArchiveAndExit) {
+ fail_continue("shared class paths mismatch (hint: enable -Xlog:class+path=info to diagnose the failure)");
+ status = false;
+ }
+ }
+ }
+
+ if (_paths_misc_info != NULL) {
+ FREE_C_HEAP_ARRAY(char, _paths_misc_info);
+ _paths_misc_info = NULL;
+ }
+ return status;
+}
+
+// The following method is provided to see whether a given pointer
+// falls in the mapped shared metadata space.
+// Param:
+// p, The given pointer
+// Return:
+// True if the p is within the mapped shared space, otherwise, false.
+bool FileMapInfo::is_in_shared_space(const void* p) {
+ for (int i = 0; i < MetaspaceShared::num_non_heap_spaces; i++) {
+ char *base;
+ if (_header->_space[i]._used == 0) {
+ continue;
+ }
+ base = _header->region_addr(i);
+ if (p >= base && p < base + _header->_space[i]._used) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+// Check if a given address is within one of the shared regions
+bool FileMapInfo::is_in_shared_region(const void* p, int idx) {
+ assert(idx == MetaspaceShared::ro ||
+ idx == MetaspaceShared::rw ||
+ idx == MetaspaceShared::mc ||
+ idx == MetaspaceShared::md, "invalid region index");
+ char* base = _header->region_addr(idx);
+ if (p >= base && p < base + _header->_space[idx]._used) {
+ return true;
+ }
+ return false;
+}
+
+void FileMapInfo::print_shared_spaces() {
+ tty->print_cr("Shared Spaces:");
+ for (int i = 0; i < MetaspaceShared::n_regions; i++) {
+ struct FileMapInfo::FileMapHeader::space_info* si = &_header->_space[i];
+ char *base = _header->region_addr(i);
+ tty->print(" %s " INTPTR_FORMAT "-" INTPTR_FORMAT,
+ shared_region_name[i],
+ p2i(base), p2i(base + si->_used));
+ }
+}
+
+// Unmap mapped regions of shared space.
+void FileMapInfo::stop_sharing_and_unmap(const char* msg) {
+ FileMapInfo *map_info = FileMapInfo::current_info();
+ if (map_info) {
+ map_info->fail_continue("%s", msg);
+ for (int i = 0; i < MetaspaceShared::num_non_heap_spaces; i++) {
+ char *addr = map_info->_header->region_addr(i);
+ if (addr != NULL && !MetaspaceShared::is_heap_region(i)) {
+ map_info->unmap_region(i);
+ map_info->_header->_space[i]._addr._base = NULL;
+ }
+ }
+ // Dealloc the archive heap regions only without unmapping. The regions are part
+ // of the java heap. Unmapping of the heap regions are managed by GC.
+ map_info->dealloc_archive_heap_regions(open_archive_heap_ranges,
+ num_open_archive_heap_ranges);
+ map_info->dealloc_archive_heap_regions(string_ranges, num_string_ranges);
+ } else if (DumpSharedSpaces) {
+ fail_stop("%s", msg);
+ }
+}