jdk

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/*
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 * Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "cds/archiveBuilder.hpp"
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#include "cds/archiveHeapLoader.hpp"
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#include "cds/archiveHeapWriter.hpp"
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#include "cds/cds_globals.hpp"
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#include "cds/cdsConfig.hpp"
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#include "cds/cdsProtectionDomain.hpp"
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#include "cds/cds_globals.hpp"
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#include "cds/classListParser.hpp"
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#include "cds/classListWriter.hpp"
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#include "cds/classPrelinker.hpp"
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#include "cds/cppVtables.hpp"
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#include "cds/dumpAllocStats.hpp"
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#include "cds/dynamicArchive.hpp"
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#include "cds/filemap.hpp"
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#include "cds/heapShared.hpp"
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#include "cds/lambdaFormInvokers.hpp"
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#include "cds/metaspaceShared.hpp"
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#include "classfile/classLoaderDataGraph.hpp"
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#include "classfile/classLoaderDataShared.hpp"
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#include "classfile/classLoaderExt.hpp"
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#include "classfile/javaClasses.inline.hpp"
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#include "classfile/loaderConstraints.hpp"
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#include "classfile/modules.hpp"
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#include "classfile/placeholders.hpp"
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#include "classfile/stringTable.hpp"
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#include "classfile/symbolTable.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "classfile/systemDictionaryShared.hpp"
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#include "classfile/vmClasses.hpp"
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#include "classfile/vmSymbols.hpp"
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#include "code/codeCache.hpp"
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#include "gc/shared/gcVMOperations.hpp"
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#include "interpreter/bytecodeStream.hpp"
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#include "interpreter/bytecodes.hpp"
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#include "jvm_io.h"
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#include "logging/log.hpp"
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#include "logging/logMessage.hpp"
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#include "logging/logStream.hpp"
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#include "memory/metaspace.hpp"
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#include "memory/metaspaceClosure.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.hpp"
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#include "nmt/memTracker.hpp"
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#include "oops/compressedKlass.hpp"
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#include "oops/instanceMirrorKlass.hpp"
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#include "oops/klass.inline.hpp"
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#include "oops/objArrayOop.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/oopHandle.hpp"
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#include "prims/jvmtiExport.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/globals_extension.hpp"
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#include "runtime/handles.inline.hpp"
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#include "runtime/os.inline.hpp"
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#include "runtime/safepointVerifiers.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "runtime/vmOperations.hpp"
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#include "runtime/vmThread.hpp"
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#include "sanitizers/leak.hpp"
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#include "utilities/align.hpp"
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#include "utilities/bitMap.inline.hpp"
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#include "utilities/defaultStream.hpp"
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#include "utilities/ostream.hpp"
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#include "utilities/resourceHash.hpp"
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ReservedSpace MetaspaceShared::_symbol_rs;
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VirtualSpace MetaspaceShared::_symbol_vs;
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bool MetaspaceShared::_archive_loading_failed = false;
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bool MetaspaceShared::_remapped_readwrite = false;
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void* MetaspaceShared::_shared_metaspace_static_top = nullptr;
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intx MetaspaceShared::_relocation_delta;
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char* MetaspaceShared::_requested_base_address;
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bool MetaspaceShared::_use_optimized_module_handling = true;
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// The CDS archive is divided into the following regions:
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//     rw  - read-write metadata
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//     ro  - read-only metadata and read-only tables
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//     hp  - heap region
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//     bm  - bitmap for relocating the above 7 regions.
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//
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// The rw and ro regions are linearly allocated, in the order of rw->ro.
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// These regions are aligned with MetaspaceShared::core_region_alignment().
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//
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// These 2 regions are populated in the following steps:
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// [0] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
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//     temporarily allocated outside of the shared regions.
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// [1] We enter a safepoint and allocate a buffer for the rw/ro regions.
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// [2] C++ vtables are copied into the rw region.
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// [3] ArchiveBuilder copies RW metadata into the rw region.
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// [4] ArchiveBuilder copies RO metadata into the ro region.
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// [5] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
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//     are copied into the ro region as read-only tables.
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//
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// The heap region is populated by HeapShared::archive_objects.
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//
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// The bitmap region is used to relocate the ro/rw/hp regions.
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static DumpRegion _symbol_region("symbols");
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char* MetaspaceShared::symbol_space_alloc(size_t num_bytes) {
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  return _symbol_region.allocate(num_bytes);
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}
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// os::vm_allocation_granularity() is usually 4K for most OSes. However, some platforms
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// such as linux-aarch64 and macos-x64 ...
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// it can be either 4K or 64K and on macos-aarch64 it is 16K. To generate archives that are
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// compatible for both settings, an alternative cds core region alignment can be enabled
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// at building time:
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//   --enable-compactible-cds-alignment
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// Upon successful configuration, the compactible alignment then can be defined in:
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//   os_linux_aarch64.cpp
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//   os_bsd_x86.cpp
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size_t MetaspaceShared::core_region_alignment() {
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  return os::cds_core_region_alignment();
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}
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static bool shared_base_valid(char* shared_base) {
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  // We check user input for SharedBaseAddress at dump time. We must weed out values
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  // we already know to be invalid later.
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  // At CDS runtime, "shared_base" will be the (attempted) mapping start. It will also
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  // be the encoding base, since the the headers of archived base objects (and with Lilliput,
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  // the prototype mark words) carry pre-computed narrow Klass IDs that refer to the mapping
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  // start as base.
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  //
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  // Therefore, "shared_base" must be later usable as encoding base.
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  return AARCH64_ONLY(is_aligned(shared_base, 4 * G)) NOT_AARCH64(true);
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}
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class DumpClassListCLDClosure : public CLDClosure {
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  static const int INITIAL_TABLE_SIZE = 1987;
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  static const int MAX_TABLE_SIZE = 61333;
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  fileStream *_stream;
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  ResizeableResourceHashtable<InstanceKlass*, bool,
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                              AnyObj::C_HEAP, mtClassShared> _dumped_classes;
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  void dump(InstanceKlass* ik) {
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    bool created;
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    _dumped_classes.put_if_absent(ik, &created);
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    if (!created) {
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      return;
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    }
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    if (_dumped_classes.maybe_grow()) {
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      log_info(cds, hashtables)("Expanded _dumped_classes table to %d", _dumped_classes.table_size());
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    }
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    if (ik->java_super()) {
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      dump(ik->java_super());
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    }
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    Array<InstanceKlass*>* interfaces = ik->local_interfaces();
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    int len = interfaces->length();
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    for (int i = 0; i < len; i++) {
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      dump(interfaces->at(i));
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    }
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    ClassListWriter::write_to_stream(ik, _stream);
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  }
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public:
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  DumpClassListCLDClosure(fileStream* f)
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  : CLDClosure(), _dumped_classes(INITIAL_TABLE_SIZE, MAX_TABLE_SIZE) {
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    _stream = f;
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  }
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  void do_cld(ClassLoaderData* cld) {
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    for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
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      if (klass->is_instance_klass()) {
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        dump(InstanceKlass::cast(klass));
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      }
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    }
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  }
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};
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void MetaspaceShared::dump_loaded_classes(const char* file_name, TRAPS) {
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  fileStream stream(file_name, "w");
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  if (stream.is_open()) {
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    MutexLocker lock(ClassLoaderDataGraph_lock);
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    MutexLocker lock2(ClassListFile_lock, Mutex::_no_safepoint_check_flag);
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    DumpClassListCLDClosure collect_classes(&stream);
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    ClassLoaderDataGraph::loaded_cld_do(&collect_classes);
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  } else {
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    THROW_MSG(vmSymbols::java_io_IOException(), "Failed to open file");
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  }
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}
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static bool shared_base_too_high(char* specified_base, char* aligned_base, size_t cds_max) {
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  if (specified_base != nullptr && aligned_base < specified_base) {
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    // SharedBaseAddress is very high (e.g., 0xffffffffffffff00) so
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    // align_up(SharedBaseAddress, MetaspaceShared::core_region_alignment()) has wrapped around.
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    return true;
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  }
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  if (max_uintx - uintx(aligned_base) < uintx(cds_max)) {
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    // The end of the archive will wrap around
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    return true;
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  }
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  return false;
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}
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static char* compute_shared_base(size_t cds_max) {
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  char* specified_base = (char*)SharedBaseAddress;
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  char* aligned_base = align_up(specified_base, MetaspaceShared::core_region_alignment());
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  if (UseCompressedClassPointers) {
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    aligned_base = align_up(specified_base, Metaspace::reserve_alignment());
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  }
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  if (aligned_base != specified_base) {
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    log_info(cds)("SharedBaseAddress (" INTPTR_FORMAT ") aligned up to " INTPTR_FORMAT,
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                   p2i(specified_base), p2i(aligned_base));
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  }
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  const char* err = nullptr;
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  if (shared_base_too_high(specified_base, aligned_base, cds_max)) {
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    err = "too high";
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  } else if (!shared_base_valid(aligned_base)) {
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    err = "invalid for this platform";
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  } else {
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    return aligned_base;
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  }
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  log_warning(cds)("SharedBaseAddress (" INTPTR_FORMAT ") is %s. Reverted to " INTPTR_FORMAT,
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                   p2i((void*)SharedBaseAddress), err,
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                   p2i((void*)Arguments::default_SharedBaseAddress()));
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  specified_base = (char*)Arguments::default_SharedBaseAddress();
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  aligned_base = align_up(specified_base, MetaspaceShared::core_region_alignment());
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  // Make sure the default value of SharedBaseAddress specified in globals.hpp is sane.
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  assert(!shared_base_too_high(specified_base, aligned_base, cds_max), "Sanity");
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  assert(shared_base_valid(aligned_base), "Sanity");
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  return aligned_base;
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}
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void MetaspaceShared::initialize_for_static_dump() {
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  assert(CDSConfig::is_dumping_static_archive(), "sanity");
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  log_info(cds)("Core region alignment: " SIZE_FORMAT, core_region_alignment());
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  // The max allowed size for CDS archive. We use this to limit SharedBaseAddress
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  // to avoid address space wrap around.
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  size_t cds_max;
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  const size_t reserve_alignment = core_region_alignment();
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#ifdef _LP64
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  const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
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  cds_max = align_down(UnscaledClassSpaceMax, reserve_alignment);
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#else
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  // We don't support archives larger than 256MB on 32-bit due to limited
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  //  virtual address space.
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  cds_max = align_down(256*M, reserve_alignment);
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#endif
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  _requested_base_address = compute_shared_base(cds_max);
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  SharedBaseAddress = (size_t)_requested_base_address;
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  size_t symbol_rs_size = LP64_ONLY(3 * G) NOT_LP64(128 * M);
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  _symbol_rs = ReservedSpace(symbol_rs_size);
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  if (!_symbol_rs.is_reserved()) {
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    log_error(cds)("Unable to reserve memory for symbols: " SIZE_FORMAT " bytes.", symbol_rs_size);
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    MetaspaceShared::unrecoverable_writing_error();
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  }
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  _symbol_region.init(&_symbol_rs, &_symbol_vs);
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}
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// Called by universe_post_init()
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void MetaspaceShared::post_initialize(TRAPS) {
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  if (CDSConfig::is_using_archive()) {
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    int size = FileMapInfo::get_number_of_shared_paths();
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    if (size > 0) {
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      CDSProtectionDomain::allocate_shared_data_arrays(size, CHECK);
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      if (!CDSConfig::is_dumping_dynamic_archive()) {
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        FileMapInfo* info;
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        if (FileMapInfo::dynamic_info() == nullptr) {
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          info = FileMapInfo::current_info();
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        } else {
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          info = FileMapInfo::dynamic_info();
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        }
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        ClassLoaderExt::init_paths_start_index(info->app_class_paths_start_index());
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        ClassLoaderExt::init_app_module_paths_start_index(info->app_module_paths_start_index());
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      }
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    }
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  }
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}
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static GrowableArrayCHeap<OopHandle, mtClassShared>* _extra_interned_strings = nullptr;
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static GrowableArrayCHeap<Symbol*, mtClassShared>* _extra_symbols = nullptr;
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void MetaspaceShared::read_extra_data(JavaThread* current, const char* filename) {
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  _extra_interned_strings = new GrowableArrayCHeap<OopHandle, mtClassShared>(10000);
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  _extra_symbols = new GrowableArrayCHeap<Symbol*, mtClassShared>(1000);
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  HashtableTextDump reader(filename);
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  reader.check_version("VERSION: 1.0");
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  while (reader.remain() > 0) {
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    int utf8_length;
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    int prefix_type = reader.scan_prefix(&utf8_length);
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    ResourceMark rm(current);
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    if (utf8_length == 0x7fffffff) {
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      // buf_len will overflown 32-bit value.
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      log_error(cds)("string length too large: %d", utf8_length);
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      MetaspaceShared::unrecoverable_loading_error();
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    }
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    int buf_len = utf8_length+1;
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    char* utf8_buffer = NEW_RESOURCE_ARRAY(char, buf_len);
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    reader.get_utf8(utf8_buffer, utf8_length);
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    utf8_buffer[utf8_length] = '\0';
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    if (prefix_type == HashtableTextDump::SymbolPrefix) {
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      _extra_symbols->append(SymbolTable::new_permanent_symbol(utf8_buffer));
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    } else{
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      assert(prefix_type == HashtableTextDump::StringPrefix, "Sanity");
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      ExceptionMark em(current);
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      JavaThread* THREAD = current; // For exception macros.
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      oop str = StringTable::intern(utf8_buffer, THREAD);
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      if (HAS_PENDING_EXCEPTION) {
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        log_warning(cds, heap)("[line %d] extra interned string allocation failed; size too large: %d",
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                               reader.last_line_no(), utf8_length);
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        CLEAR_PENDING_EXCEPTION;
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      } else {
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#if INCLUDE_CDS_JAVA_HEAP
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        if (ArchiveHeapWriter::is_string_too_large_to_archive(str)) {
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          log_warning(cds, heap)("[line %d] extra interned string ignored; size too large: %d",
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                                 reader.last_line_no(), utf8_length);
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          continue;
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        }
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        // Make sure this string is included in the dumped interned string table.
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        assert(str != nullptr, "must succeed");
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        _extra_interned_strings->append(OopHandle(Universe::vm_global(), str));
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#endif
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      }
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    }
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  }
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}
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// Read/write a data stream for restoring/preserving metadata pointers and
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// miscellaneous data from/to the shared archive file.
362

363
void MetaspaceShared::serialize(SerializeClosure* soc) {
364
  int tag = 0;
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  soc->do_tag(--tag);
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  // Verify the sizes of various metadata in the system.
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  soc->do_tag(sizeof(Method));
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  soc->do_tag(sizeof(ConstMethod));
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  soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
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  soc->do_tag(sizeof(ConstantPool));
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  soc->do_tag(sizeof(ConstantPoolCache));
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  soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
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  soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
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  soc->do_tag(sizeof(Symbol));
376

377
  // Need to do this first, as subsequent steps may call virtual functions
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  // in archived Metadata objects.
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  CppVtables::serialize(soc);
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  soc->do_tag(--tag);
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  // Dump/restore miscellaneous metadata.
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  JavaClasses::serialize_offsets(soc);
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  Universe::serialize(soc);
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  soc->do_tag(--tag);
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  // Dump/restore references to commonly used names and signatures.
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  vmSymbols::serialize(soc);
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  soc->do_tag(--tag);
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  // Dump/restore the symbol/string/subgraph_info tables
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  SymbolTable::serialize_shared_table_header(soc);
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  StringTable::serialize_shared_table_header(soc);
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  HeapShared::serialize_tables(soc);
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  SystemDictionaryShared::serialize_dictionary_headers(soc);
396

397
  InstanceMirrorKlass::serialize_offsets(soc);
398

399
  // Dump/restore well known classes (pointers)
400
  SystemDictionaryShared::serialize_vm_classes(soc);
401
  soc->do_tag(--tag);
402

403
  CDS_JAVA_HEAP_ONLY(Modules::serialize(soc);)
404
  CDS_JAVA_HEAP_ONLY(ClassLoaderDataShared::serialize(soc);)
405

406
  LambdaFormInvokers::serialize(soc);
407
  soc->do_tag(666);
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}
409

410
static void rewrite_nofast_bytecode(const methodHandle& method) {
411
  BytecodeStream bcs(method);
412
  while (!bcs.is_last_bytecode()) {
413
    Bytecodes::Code opcode = bcs.next();
414
    switch (opcode) {
415
    case Bytecodes::_getfield:      *bcs.bcp() = Bytecodes::_nofast_getfield;      break;
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    case Bytecodes::_putfield:      *bcs.bcp() = Bytecodes::_nofast_putfield;      break;
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    case Bytecodes::_aload_0:       *bcs.bcp() = Bytecodes::_nofast_aload_0;       break;
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    case Bytecodes::_iload: {
419
      if (!bcs.is_wide()) {
420
        *bcs.bcp() = Bytecodes::_nofast_iload;
421
      }
422
      break;
423
    }
424
    default: break;
425
    }
426
  }
427
}
428

429
// [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
430
//     at run time by RewriteBytecodes/RewriteFrequentPairs
431
// [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
432
void MetaspaceShared::rewrite_nofast_bytecodes_and_calculate_fingerprints(Thread* thread, InstanceKlass* ik) {
433
  for (int i = 0; i < ik->methods()->length(); i++) {
434
    methodHandle m(thread, ik->methods()->at(i));
435
    if (ik->can_be_verified_at_dumptime() && ik->is_linked()) {
436
      rewrite_nofast_bytecode(m);
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    }
438
    Fingerprinter fp(m);
439
    // The side effect of this call sets method's fingerprint field.
440
    fp.fingerprint();
441
  }
442
}
443

444
class VM_PopulateDumpSharedSpace : public VM_Operation {
445
private:
446
  ArchiveHeapInfo _heap_info;
447
  FileMapInfo* _map_info;
448
  StaticArchiveBuilder& _builder;
449

450
  void dump_java_heap_objects(GrowableArray<Klass*>* klasses) NOT_CDS_JAVA_HEAP_RETURN;
451
  void dump_shared_symbol_table(GrowableArray<Symbol*>* symbols) {
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    log_info(cds)("Dumping symbol table ...");
453
    SymbolTable::write_to_archive(symbols);
454
  }
455
  char* dump_read_only_tables();
456

457
public:
458

459
  VM_PopulateDumpSharedSpace(StaticArchiveBuilder& b) :
460
    VM_Operation(), _heap_info(), _map_info(nullptr), _builder(b) {}
461

462
  bool skip_operation() const { return false; }
463

464
  VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
465
  ArchiveHeapInfo* heap_info()  { return &_heap_info; }
466
  FileMapInfo* map_info() const { return _map_info; }
467
  void doit();   // outline because gdb sucks
468
  bool allow_nested_vm_operations() const { return true; }
469
}; // class VM_PopulateDumpSharedSpace
470

471
class StaticArchiveBuilder : public ArchiveBuilder {
472
public:
473
  StaticArchiveBuilder() : ArchiveBuilder() {}
474

475
  virtual void iterate_roots(MetaspaceClosure* it) {
476
    FileMapInfo::metaspace_pointers_do(it);
477
    SystemDictionaryShared::dumptime_classes_do(it);
478
    Universe::metaspace_pointers_do(it);
479
    vmSymbols::metaspace_pointers_do(it);
480

481
    // The above code should find all the symbols that are referenced by the
482
    // archived classes. We just need to add the extra symbols which
483
    // may not be used by any of the archived classes -- these are usually
484
    // symbols that we anticipate to be used at run time, so we can store
485
    // them in the RO region, to be shared across multiple processes.
486
    if (_extra_symbols != nullptr) {
487
      for (int i = 0; i < _extra_symbols->length(); i++) {
488
        it->push(_extra_symbols->adr_at(i));
489
      }
490
    }
491
  }
492
};
493

494
char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
495
  ArchiveBuilder::OtherROAllocMark mark;
496

497
  SystemDictionaryShared::write_to_archive();
498

499
  // Write lambform lines into archive
500
  LambdaFormInvokers::dump_static_archive_invokers();
501
  // Write module name into archive
502
  CDS_JAVA_HEAP_ONLY(Modules::dump_main_module_name();)
503
  // Write the other data to the output array.
504
  DumpRegion* ro_region = ArchiveBuilder::current()->ro_region();
505
  char* start = ro_region->top();
506
  WriteClosure wc(ro_region);
507
  MetaspaceShared::serialize(&wc);
508

509
  return start;
510
}
511

512
void VM_PopulateDumpSharedSpace::doit() {
513
  guarantee(!CDSConfig::is_using_archive(), "We should not be using an archive when we dump");
514

515
  DEBUG_ONLY(SystemDictionaryShared::NoClassLoadingMark nclm);
516

517
  FileMapInfo::check_nonempty_dir_in_shared_path_table();
518

519
  NOT_PRODUCT(SystemDictionary::verify();)
520

521
  // Block concurrent class unloading from changing the _dumptime_table
522
  MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
523
  SystemDictionaryShared::check_excluded_classes();
524

525
  _builder.gather_source_objs();
526
  _builder.reserve_buffer();
527

528
  CppVtables::dumptime_init(&_builder);
529

530
  _builder.sort_metadata_objs();
531
  _builder.dump_rw_metadata();
532
  _builder.dump_ro_metadata();
533
  _builder.relocate_metaspaceobj_embedded_pointers();
534

535
  dump_java_heap_objects(_builder.klasses());
536
  dump_shared_symbol_table(_builder.symbols());
537

538
  log_info(cds)("Make classes shareable");
539
  _builder.make_klasses_shareable();
540

541
  char* serialized_data = dump_read_only_tables();
542

543
  SystemDictionaryShared::adjust_lambda_proxy_class_dictionary();
544

545
  // The vtable clones contain addresses of the current process.
546
  // We don't want to write these addresses into the archive.
547
  CppVtables::zero_archived_vtables();
548

549
  // Write the archive file
550
  const char* static_archive = CDSConfig::static_archive_path();
551
  assert(static_archive != nullptr, "SharedArchiveFile not set?");
552
  _map_info = new FileMapInfo(static_archive, true);
553
  _map_info->populate_header(MetaspaceShared::core_region_alignment());
554
  _map_info->set_serialized_data(serialized_data);
555
  _map_info->set_cloned_vtables(CppVtables::vtables_serialized_base());
556
}
557

558
class CollectCLDClosure : public CLDClosure {
559
  GrowableArray<ClassLoaderData*> _loaded_cld;
560
  GrowableArray<OopHandle> _loaded_cld_handles; // keep the CLDs alive
561
  Thread* _current_thread;
562
public:
563
  CollectCLDClosure(Thread* thread) : _current_thread(thread) {}
564
  ~CollectCLDClosure() {
565
    for (int i = 0; i < _loaded_cld_handles.length(); i++) {
566
      _loaded_cld_handles.at(i).release(Universe::vm_global());
567
    }
568
  }
569
  void do_cld(ClassLoaderData* cld) {
570
    assert(cld->is_alive(), "must be");
571
    _loaded_cld.append(cld);
572
    _loaded_cld_handles.append(OopHandle(Universe::vm_global(), cld->holder()));
573
  }
574

575
  int nof_cld() const                { return _loaded_cld.length(); }
576
  ClassLoaderData* cld_at(int index) { return _loaded_cld.at(index); }
577
};
578

579
// Check if we can eagerly link this class at dump time, so we can avoid the
580
// runtime linking overhead (especially verification)
581
bool MetaspaceShared::may_be_eagerly_linked(InstanceKlass* ik) {
582
  if (!ik->can_be_verified_at_dumptime()) {
583
    // For old classes, try to leave them in the unlinked state, so
584
    // we can still store them in the archive. They must be
585
    // linked/verified at runtime.
586
    return false;
587
  }
588
  if (CDSConfig::is_dumping_dynamic_archive() && ik->is_shared_unregistered_class()) {
589
    // Linking of unregistered classes at this stage may cause more
590
    // classes to be resolved, resulting in calls to ClassLoader.loadClass()
591
    // that may not be expected by custom class loaders.
592
    //
593
    // It's OK to do this for the built-in loaders as we know they can
594
    // tolerate this.
595
    return false;
596
  }
597
  return true;
598
}
599

600
bool MetaspaceShared::link_class_for_cds(InstanceKlass* ik, TRAPS) {
601
  // Link the class to cause the bytecodes to be rewritten and the
602
  // cpcache to be created. Class verification is done according
603
  // to -Xverify setting.
604
  bool res = MetaspaceShared::try_link_class(THREAD, ik);
605
  ClassPrelinker::dumptime_resolve_constants(ik, CHECK_(false));
606
  return res;
607
}
608

609
void MetaspaceShared::link_shared_classes(bool jcmd_request, TRAPS) {
610
  ClassPrelinker::initialize();
611

612
  if (!jcmd_request) {
613
    LambdaFormInvokers::regenerate_holder_classes(CHECK);
614
  }
615

616
  // Collect all loaded ClassLoaderData.
617
  CollectCLDClosure collect_cld(THREAD);
618
  {
619
    // ClassLoaderDataGraph::loaded_cld_do requires ClassLoaderDataGraph_lock.
620
    // We cannot link the classes while holding this lock (or else we may run into deadlock).
621
    // Therefore, we need to first collect all the CLDs, and then link their classes after
622
    // releasing the lock.
623
    MutexLocker lock(ClassLoaderDataGraph_lock);
624
    ClassLoaderDataGraph::loaded_cld_do(&collect_cld);
625
  }
626

627
  while (true) {
628
    bool has_linked = false;
629
    for (int i = 0; i < collect_cld.nof_cld(); i++) {
630
      ClassLoaderData* cld = collect_cld.cld_at(i);
631
      for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
632
        if (klass->is_instance_klass()) {
633
          InstanceKlass* ik = InstanceKlass::cast(klass);
634
          if (may_be_eagerly_linked(ik)) {
635
            has_linked |= link_class_for_cds(ik, CHECK);
636
          }
637
        }
638
      }
639
    }
640

641
    if (!has_linked) {
642
      break;
643
    }
644
    // Class linking includes verification which may load more classes.
645
    // Keep scanning until we have linked no more classes.
646
  }
647
}
648

649
void MetaspaceShared::prepare_for_dumping() {
650
  assert(CDSConfig::is_dumping_archive(), "sanity");
651
  CDSConfig::check_unsupported_dumping_module_options();
652
  ClassLoader::initialize_shared_path(JavaThread::current());
653
}
654

655
// Preload classes from a list, populate the shared spaces and dump to a
656
// file.
657
void MetaspaceShared::preload_and_dump(TRAPS) {
658
  ResourceMark rm(THREAD);
659
  StaticArchiveBuilder builder;
660
  preload_and_dump_impl(builder, THREAD);
661
  if (HAS_PENDING_EXCEPTION) {
662
    if (PENDING_EXCEPTION->is_a(vmClasses::OutOfMemoryError_klass())) {
663
      log_error(cds)("Out of memory. Please run with a larger Java heap, current MaxHeapSize = "
664
                     SIZE_FORMAT "M", MaxHeapSize/M);
665
      MetaspaceShared::writing_error();
666
    } else {
667
      log_error(cds)("%s: %s", PENDING_EXCEPTION->klass()->external_name(),
668
                     java_lang_String::as_utf8_string(java_lang_Throwable::message(PENDING_EXCEPTION)));
669
      MetaspaceShared::writing_error("Unexpected exception, use -Xlog:cds,exceptions=trace for detail");
670
    }
671
  }
672
}
673

674
#if INCLUDE_CDS_JAVA_HEAP && defined(_LP64)
675
void MetaspaceShared::adjust_heap_sizes_for_dumping() {
676
  if (!CDSConfig::is_dumping_heap() || UseCompressedOops) {
677
    return;
678
  }
679
  // CDS heap dumping requires all string oops to have an offset
680
  // from the heap bottom that can be encoded in 32-bit.
681
  julong max_heap_size = (julong)(4 * G);
682

683
  if (MinHeapSize > max_heap_size) {
684
    log_debug(cds)("Setting MinHeapSize to 4G for CDS dumping, original size = " SIZE_FORMAT "M", MinHeapSize/M);
685
    FLAG_SET_ERGO(MinHeapSize, max_heap_size);
686
  }
687
  if (InitialHeapSize > max_heap_size) {
688
    log_debug(cds)("Setting InitialHeapSize to 4G for CDS dumping, original size = " SIZE_FORMAT "M", InitialHeapSize/M);
689
    FLAG_SET_ERGO(InitialHeapSize, max_heap_size);
690
  }
691
  if (MaxHeapSize > max_heap_size) {
692
    log_debug(cds)("Setting MaxHeapSize to 4G for CDS dumping, original size = " SIZE_FORMAT "M", MaxHeapSize/M);
693
    FLAG_SET_ERGO(MaxHeapSize, max_heap_size);
694
  }
695
}
696
#endif // INCLUDE_CDS_JAVA_HEAP && _LP64
697

698
void MetaspaceShared::get_default_classlist(char* default_classlist, const size_t buf_size) {
699
  // Construct the path to the class list (in jre/lib)
700
  // Walk up two directories from the location of the VM and
701
  // optionally tack on "lib" (depending on platform)
702
  os::jvm_path(default_classlist, (jint)(buf_size));
703
  for (int i = 0; i < 3; i++) {
704
    char *end = strrchr(default_classlist, *os::file_separator());
705
    if (end != nullptr) *end = '\0';
706
  }
707
  size_t classlist_path_len = strlen(default_classlist);
708
  if (classlist_path_len >= 3) {
709
    if (strcmp(default_classlist + classlist_path_len - 3, "lib") != 0) {
710
      if (classlist_path_len < buf_size - 4) {
711
        jio_snprintf(default_classlist + classlist_path_len,
712
                     buf_size - classlist_path_len,
713
                     "%slib", os::file_separator());
714
        classlist_path_len += 4;
715
      }
716
    }
717
  }
718
  if (classlist_path_len < buf_size - 10) {
719
    jio_snprintf(default_classlist + classlist_path_len,
720
                 buf_size - classlist_path_len,
721
                 "%sclasslist", os::file_separator());
722
  }
723
}
724

725
void MetaspaceShared::preload_classes(TRAPS) {
726
  char default_classlist[JVM_MAXPATHLEN];
727
  const char* classlist_path;
728

729
  get_default_classlist(default_classlist, sizeof(default_classlist));
730
  if (SharedClassListFile == nullptr) {
731
    classlist_path = default_classlist;
732
  } else {
733
    classlist_path = SharedClassListFile;
734
  }
735

736
  log_info(cds)("Loading classes to share ...");
737
  ClassListParser::parse_classlist(classlist_path,
738
                                   ClassListParser::_parse_all, CHECK);
739
  if (ExtraSharedClassListFile) {
740
    ClassListParser::parse_classlist(ExtraSharedClassListFile,
741
                                     ClassListParser::_parse_all, CHECK);
742
  }
743
  if (classlist_path != default_classlist) {
744
    struct stat statbuf;
745
    if (os::stat(default_classlist, &statbuf) == 0) {
746
      // File exists, let's use it.
747
      ClassListParser::parse_classlist(default_classlist,
748
                                       ClassListParser::_parse_lambda_forms_invokers_only, CHECK);
749
    }
750
  }
751

752
  // Exercise the manifest processing code to ensure classes used by CDS at runtime
753
  // are always archived
754
  const char* dummy = "Manifest-Version: 1.0\n";
755
  CDSProtectionDomain::create_jar_manifest(dummy, strlen(dummy), CHECK);
756

757
  log_info(cds)("Loading classes to share: done.");
758
}
759

760
void MetaspaceShared::preload_and_dump_impl(StaticArchiveBuilder& builder, TRAPS) {
761
  preload_classes(CHECK);
762

763
  if (SharedArchiveConfigFile) {
764
    log_info(cds)("Reading extra data from %s ...", SharedArchiveConfigFile);
765
    read_extra_data(THREAD, SharedArchiveConfigFile);
766
    log_info(cds)("Reading extra data: done.");
767
  }
768

769
  // Rewrite and link classes
770
  log_info(cds)("Rewriting and linking classes ...");
771

772
  // Link any classes which got missed. This would happen if we have loaded classes that
773
  // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
774
  // fails verification, all other interfaces that were not specified in the classlist but
775
  // are implemented by K are not verified.
776
  link_shared_classes(false/*not from jcmd*/, CHECK);
777
  log_info(cds)("Rewriting and linking classes: done");
778

779
#if INCLUDE_CDS_JAVA_HEAP
780
  if (CDSConfig::is_dumping_heap()) {
781
    if (!HeapShared::is_archived_boot_layer_available(THREAD)) {
782
      log_info(cds)("archivedBootLayer not available, disabling full module graph");
783
      CDSConfig::stop_dumping_full_module_graph();
784
    }
785
    HeapShared::init_for_dumping(CHECK);
786
    ArchiveHeapWriter::init();
787
    if (CDSConfig::is_dumping_full_module_graph()) {
788
      HeapShared::reset_archived_object_states(CHECK);
789
    }
790

791
    // Do this at the very end, when no Java code will be executed. Otherwise
792
    // some new strings may be added to the intern table.
793
    StringTable::allocate_shared_strings_array(CHECK);
794
  }
795
#endif
796

797
  VM_PopulateDumpSharedSpace op(builder);
798
  VMThread::execute(&op);
799

800
  if (!write_static_archive(&builder, op.map_info(), op.heap_info())) {
801
    THROW_MSG(vmSymbols::java_io_IOException(), "Encountered error while dumping");
802
  }
803
}
804

805
bool MetaspaceShared::write_static_archive(ArchiveBuilder* builder, FileMapInfo* map_info, ArchiveHeapInfo* heap_info) {
806
  // relocate the data so that it can be mapped to MetaspaceShared::requested_base_address()
807
  // without runtime relocation.
808
  builder->relocate_to_requested();
809

810
  map_info->open_for_write();
811
  if (!map_info->is_open()) {
812
    return false;
813
  }
814
  builder->write_archive(map_info, heap_info);
815

816
  if (AllowArchivingWithJavaAgent) {
817
    log_warning(cds)("This archive was created with AllowArchivingWithJavaAgent. It should be used "
818
            "for testing purposes only and should not be used in a production environment");
819
  }
820
  return true;
821
}
822

823
// Returns true if the class's status has changed.
824
bool MetaspaceShared::try_link_class(JavaThread* current, InstanceKlass* ik) {
825
  ExceptionMark em(current);
826
  JavaThread* THREAD = current; // For exception macros.
827
  assert(CDSConfig::is_dumping_archive(), "sanity");
828
  if (!ik->is_shared() && ik->is_loaded() && !ik->is_linked() && ik->can_be_verified_at_dumptime() &&
829
      !SystemDictionaryShared::has_class_failed_verification(ik)) {
830
    bool saved = BytecodeVerificationLocal;
831
    if (ik->is_shared_unregistered_class() && ik->class_loader() == nullptr) {
832
      // The verification decision is based on BytecodeVerificationRemote
833
      // for non-system classes. Since we are using the null classloader
834
      // to load non-system classes for customized class loaders during dumping,
835
      // we need to temporarily change BytecodeVerificationLocal to be the same as
836
      // BytecodeVerificationRemote. Note this can cause the parent system
837
      // classes also being verified. The extra overhead is acceptable during
838
      // dumping.
839
      BytecodeVerificationLocal = BytecodeVerificationRemote;
840
    }
841
    ik->link_class(THREAD);
842
    if (HAS_PENDING_EXCEPTION) {
843
      ResourceMark rm(THREAD);
844
      log_warning(cds)("Preload Warning: Verification failed for %s",
845
                    ik->external_name());
846
      CLEAR_PENDING_EXCEPTION;
847
      SystemDictionaryShared::set_class_has_failed_verification(ik);
848
    }
849
    ik->compute_has_loops_flag_for_methods();
850
    BytecodeVerificationLocal = saved;
851
    return true;
852
  } else {
853
    return false;
854
  }
855
}
856

857
#if INCLUDE_CDS_JAVA_HEAP
858
void VM_PopulateDumpSharedSpace::dump_java_heap_objects(GrowableArray<Klass*>* klasses) {
859
  if(!HeapShared::can_write()) {
860
    log_info(cds)(
861
      "Archived java heap is not supported as UseG1GC "
862
      "and UseCompressedClassPointers are required."
863
      "Current settings: UseG1GC=%s, UseCompressedClassPointers=%s.",
864
      BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedClassPointers));
865
    return;
866
  }
867
  // Find all the interned strings that should be dumped.
868
  int i;
869
  for (i = 0; i < klasses->length(); i++) {
870
    Klass* k = klasses->at(i);
871
    if (k->is_instance_klass()) {
872
      InstanceKlass* ik = InstanceKlass::cast(k);
873
      if (ik->is_linked()) {
874
        ik->constants()->add_dumped_interned_strings();
875
      }
876
    }
877
  }
878
  if (_extra_interned_strings != nullptr) {
879
    for (i = 0; i < _extra_interned_strings->length(); i ++) {
880
      OopHandle string = _extra_interned_strings->at(i);
881
      HeapShared::add_to_dumped_interned_strings(string.resolve());
882
    }
883
  }
884

885
  HeapShared::archive_objects(&_heap_info);
886
  ArchiveBuilder::OtherROAllocMark mark;
887
  HeapShared::write_subgraph_info_table();
888
}
889
#endif // INCLUDE_CDS_JAVA_HEAP
890

891
void MetaspaceShared::set_shared_metaspace_range(void* base, void *static_top, void* top) {
892
  assert(base <= static_top && static_top <= top, "must be");
893
  _shared_metaspace_static_top = static_top;
894
  MetaspaceObj::set_shared_metaspace_range(base, top);
895
}
896

897
bool MetaspaceShared::is_shared_dynamic(void* p) {
898
  if ((p < MetaspaceObj::shared_metaspace_top()) &&
899
      (p >= _shared_metaspace_static_top)) {
900
    return true;
901
  } else {
902
    return false;
903
  }
904
}
905

906
bool MetaspaceShared::is_shared_static(void* p) {
907
  if (is_in_shared_metaspace(p) && !is_shared_dynamic(p)) {
908
    return true;
909
  } else {
910
    return false;
911
  }
912
}
913

914
// This function is called when the JVM is unable to load the specified archive(s) due to one
915
// of the following conditions.
916
// - There's an error that indicates that the archive(s) files were corrupt or otherwise damaged.
917
// - When -XX:+RequireSharedSpaces is specified, AND the JVM cannot load the archive(s) due
918
//   to version or classpath mismatch.
919
void MetaspaceShared::unrecoverable_loading_error(const char* message) {
920
  log_error(cds)("An error has occurred while processing the shared archive file.");
921
  if (message != nullptr) {
922
    log_error(cds)("%s", message);
923
  }
924
  vm_exit_during_initialization("Unable to use shared archive.", nullptr);
925
}
926

927
// This function is called when the JVM is unable to write the specified CDS archive due to an
928
// unrecoverable error.
929
void MetaspaceShared::unrecoverable_writing_error(const char* message) {
930
  writing_error(message);
931
  vm_direct_exit(1);
932
}
933

934
// This function is called when the JVM is unable to write the specified CDS archive due to a
935
// an error. The error will be propagated
936
void MetaspaceShared::writing_error(const char* message) {
937
  log_error(cds)("An error has occurred while writing the shared archive file.");
938
  if (message != nullptr) {
939
    log_error(cds)("%s", message);
940
  }
941
}
942

943
void MetaspaceShared::initialize_runtime_shared_and_meta_spaces() {
944
  assert(CDSConfig::is_using_archive(), "Must be called when UseSharedSpaces is enabled");
945
  MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
946

947
  FileMapInfo* static_mapinfo = open_static_archive();
948
  FileMapInfo* dynamic_mapinfo = nullptr;
949

950
  if (static_mapinfo != nullptr) {
951
    log_info(cds)("Core region alignment: " SIZE_FORMAT, static_mapinfo->core_region_alignment());
952
    dynamic_mapinfo = open_dynamic_archive();
953

954
    // First try to map at the requested address
955
    result = map_archives(static_mapinfo, dynamic_mapinfo, true);
956
    if (result == MAP_ARCHIVE_MMAP_FAILURE) {
957
      // Mapping has failed (probably due to ASLR). Let's map at an address chosen
958
      // by the OS.
959
      log_info(cds)("Try to map archive(s) at an alternative address");
960
      result = map_archives(static_mapinfo, dynamic_mapinfo, false);
961
    }
962
  }
963

964
  if (result == MAP_ARCHIVE_SUCCESS) {
965
    bool dynamic_mapped = (dynamic_mapinfo != nullptr && dynamic_mapinfo->is_mapped());
966
    char* cds_base = static_mapinfo->mapped_base();
967
    char* cds_end =  dynamic_mapped ? dynamic_mapinfo->mapped_end() : static_mapinfo->mapped_end();
968
    // Register CDS memory region with LSan.
969
    LSAN_REGISTER_ROOT_REGION(cds_base, cds_end - cds_base);
970
    set_shared_metaspace_range(cds_base, static_mapinfo->mapped_end(), cds_end);
971
    _relocation_delta = static_mapinfo->relocation_delta();
972
    _requested_base_address = static_mapinfo->requested_base_address();
973
    if (dynamic_mapped) {
974
      FileMapInfo::set_shared_path_table(dynamic_mapinfo);
975
      // turn AutoCreateSharedArchive off if successfully mapped
976
      AutoCreateSharedArchive = false;
977
    } else {
978
      FileMapInfo::set_shared_path_table(static_mapinfo);
979
    }
980
  } else {
981
    set_shared_metaspace_range(nullptr, nullptr, nullptr);
982
    if (CDSConfig::is_dumping_dynamic_archive()) {
983
      log_warning(cds)("-XX:ArchiveClassesAtExit is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info.");
984
    }
985
    UseSharedSpaces = false;
986
    // The base archive cannot be mapped. We cannot dump the dynamic shared archive.
987
    AutoCreateSharedArchive = false;
988
    CDSConfig::disable_dumping_dynamic_archive();
989
    log_info(cds)("Unable to map shared spaces");
990
    if (PrintSharedArchiveAndExit) {
991
      MetaspaceShared::unrecoverable_loading_error("Unable to use shared archive.");
992
    } else if (RequireSharedSpaces) {
993
      MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
994
    }
995
  }
996

997
  // If mapping failed and -XShare:on, the vm should exit
998
  bool has_failed = false;
999
  if (static_mapinfo != nullptr && !static_mapinfo->is_mapped()) {
1000
    has_failed = true;
1001
    delete static_mapinfo;
1002
  }
1003
  if (dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped()) {
1004
    has_failed = true;
1005
    delete dynamic_mapinfo;
1006
  }
1007
  if (RequireSharedSpaces && has_failed) {
1008
      MetaspaceShared::unrecoverable_loading_error("Unable to map shared spaces");
1009
  }
1010
}
1011

1012
FileMapInfo* MetaspaceShared::open_static_archive() {
1013
  const char* static_archive = CDSConfig::static_archive_path();
1014
  assert(static_archive != nullptr, "sanity");
1015
  FileMapInfo* mapinfo = new FileMapInfo(static_archive, true);
1016
  if (!mapinfo->initialize()) {
1017
    delete(mapinfo);
1018
    return nullptr;
1019
  }
1020
  return mapinfo;
1021
}
1022

1023
FileMapInfo* MetaspaceShared::open_dynamic_archive() {
1024
  if (CDSConfig::is_dumping_dynamic_archive()) {
1025
    return nullptr;
1026
  }
1027
  const char* dynamic_archive = CDSConfig::dynamic_archive_path();
1028
  if (dynamic_archive == nullptr) {
1029
    return nullptr;
1030
  }
1031

1032
  FileMapInfo* mapinfo = new FileMapInfo(dynamic_archive, false);
1033
  if (!mapinfo->initialize()) {
1034
    delete(mapinfo);
1035
    if (RequireSharedSpaces) {
1036
      MetaspaceShared::unrecoverable_loading_error("Failed to initialize dynamic archive");
1037
    }
1038
    return nullptr;
1039
  }
1040
  return mapinfo;
1041
}
1042

1043
// use_requested_addr:
1044
//  true  = map at FileMapHeader::_requested_base_address
1045
//  false = map at an alternative address picked by OS.
1046
MapArchiveResult MetaspaceShared::map_archives(FileMapInfo* static_mapinfo, FileMapInfo* dynamic_mapinfo,
1047
                                               bool use_requested_addr) {
1048
  if (use_requested_addr && static_mapinfo->requested_base_address() == nullptr) {
1049
    log_info(cds)("Archive(s) were created with -XX:SharedBaseAddress=0. Always map at os-selected address.");
1050
    return MAP_ARCHIVE_MMAP_FAILURE;
1051
  }
1052

1053
  PRODUCT_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1054
      // For product build only -- this is for benchmarking the cost of doing relocation.
1055
      // For debug builds, the check is done below, after reserving the space, for better test coverage
1056
      // (see comment below).
1057
      log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1058
      return MAP_ARCHIVE_MMAP_FAILURE;
1059
    });
1060

1061
  if (ArchiveRelocationMode == 2 && !use_requested_addr) {
1062
    log_info(cds)("ArchiveRelocationMode == 2: never map archive(s) at an alternative address");
1063
    return MAP_ARCHIVE_MMAP_FAILURE;
1064
  };
1065

1066
  if (dynamic_mapinfo != nullptr) {
1067
    // Ensure that the OS won't be able to allocate new memory spaces between the two
1068
    // archives, or else it would mess up the simple comparison in MetaspaceObj::is_shared().
1069
    assert(static_mapinfo->mapping_end_offset() == dynamic_mapinfo->mapping_base_offset(), "no gap");
1070
  }
1071

1072
  ReservedSpace total_space_rs, archive_space_rs, class_space_rs;
1073
  MapArchiveResult result = MAP_ARCHIVE_OTHER_FAILURE;
1074
  char* mapped_base_address = reserve_address_space_for_archives(static_mapinfo,
1075
                                                                 dynamic_mapinfo,
1076
                                                                 use_requested_addr,
1077
                                                                 total_space_rs,
1078
                                                                 archive_space_rs,
1079
                                                                 class_space_rs);
1080
  if (mapped_base_address == nullptr) {
1081
    result = MAP_ARCHIVE_MMAP_FAILURE;
1082
    log_debug(cds)("Failed to reserve spaces (use_requested_addr=%u)", (unsigned)use_requested_addr);
1083
  } else {
1084

1085
#ifdef ASSERT
1086
    // Some sanity checks after reserving address spaces for archives
1087
    //  and class space.
1088
    assert(archive_space_rs.is_reserved(), "Sanity");
1089
    if (Metaspace::using_class_space()) {
1090
      // Class space must closely follow the archive space. Both spaces
1091
      //  must be aligned correctly.
1092
      assert(class_space_rs.is_reserved(),
1093
             "A class space should have been reserved");
1094
      assert(class_space_rs.base() >= archive_space_rs.end(),
1095
             "class space should follow the cds archive space");
1096
      assert(is_aligned(archive_space_rs.base(),
1097
                        core_region_alignment()),
1098
             "Archive space misaligned");
1099
      assert(is_aligned(class_space_rs.base(),
1100
                        Metaspace::reserve_alignment()),
1101
             "class space misaligned");
1102
    }
1103
#endif // ASSERT
1104

1105
    log_info(cds)("Reserved archive_space_rs [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
1106
                   p2i(archive_space_rs.base()), p2i(archive_space_rs.end()), archive_space_rs.size());
1107
    log_info(cds)("Reserved class_space_rs   [" INTPTR_FORMAT " - " INTPTR_FORMAT "] (" SIZE_FORMAT ") bytes",
1108
                   p2i(class_space_rs.base()), p2i(class_space_rs.end()), class_space_rs.size());
1109

1110
    if (MetaspaceShared::use_windows_memory_mapping()) {
1111
      // We have now reserved address space for the archives, and will map in
1112
      //  the archive files into this space.
1113
      //
1114
      // Special handling for Windows: on Windows we cannot map a file view
1115
      //  into an existing memory mapping. So, we unmap the address range we
1116
      //  just reserved again, which will make it available for mapping the
1117
      //  archives.
1118
      // Reserving this range has not been for naught however since it makes
1119
      //  us reasonably sure the address range is available.
1120
      //
1121
      // But still it may fail, since between unmapping the range and mapping
1122
      //  in the archive someone else may grab the address space. Therefore
1123
      //  there is a fallback in FileMap::map_region() where we just read in
1124
      //  the archive files sequentially instead of mapping it in. We couple
1125
      //  this with use_requested_addr, since we're going to patch all the
1126
      //  pointers anyway so there's no benefit to mmap.
1127
      if (use_requested_addr) {
1128
        assert(!total_space_rs.is_reserved(), "Should not be reserved for Windows");
1129
        log_info(cds)("Windows mmap workaround: releasing archive space.");
1130
        archive_space_rs.release();
1131
      }
1132
    }
1133
    MapArchiveResult static_result = map_archive(static_mapinfo, mapped_base_address, archive_space_rs);
1134
    MapArchiveResult dynamic_result = (static_result == MAP_ARCHIVE_SUCCESS) ?
1135
                                     map_archive(dynamic_mapinfo, mapped_base_address, archive_space_rs) : MAP_ARCHIVE_OTHER_FAILURE;
1136

1137
    DEBUG_ONLY(if (ArchiveRelocationMode == 1 && use_requested_addr) {
1138
      // This is for simulating mmap failures at the requested address. In
1139
      //  debug builds, we do it here (after all archives have possibly been
1140
      //  mapped), so we can thoroughly test the code for failure handling
1141
      //  (releasing all allocated resource, etc).
1142
      log_info(cds)("ArchiveRelocationMode == 1: always map archive(s) at an alternative address");
1143
      if (static_result == MAP_ARCHIVE_SUCCESS) {
1144
        static_result = MAP_ARCHIVE_MMAP_FAILURE;
1145
      }
1146
      if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1147
        dynamic_result = MAP_ARCHIVE_MMAP_FAILURE;
1148
      }
1149
    });
1150

1151
    if (static_result == MAP_ARCHIVE_SUCCESS) {
1152
      if (dynamic_result == MAP_ARCHIVE_SUCCESS) {
1153
        result = MAP_ARCHIVE_SUCCESS;
1154
      } else if (dynamic_result == MAP_ARCHIVE_OTHER_FAILURE) {
1155
        assert(dynamic_mapinfo != nullptr && !dynamic_mapinfo->is_mapped(), "must have failed");
1156
        // No need to retry mapping the dynamic archive again, as it will never succeed
1157
        // (bad file, etc) -- just keep the base archive.
1158
        log_warning(cds, dynamic)("Unable to use shared archive. The top archive failed to load: %s",
1159
                                  dynamic_mapinfo->full_path());
1160
        result = MAP_ARCHIVE_SUCCESS;
1161
        // TODO, we can give the unused space for the dynamic archive to class_space_rs, but there's no
1162
        // easy API to do that right now.
1163
      } else {
1164
        result = MAP_ARCHIVE_MMAP_FAILURE;
1165
      }
1166
    } else if (static_result == MAP_ARCHIVE_OTHER_FAILURE) {
1167
      result = MAP_ARCHIVE_OTHER_FAILURE;
1168
    } else {
1169
      result = MAP_ARCHIVE_MMAP_FAILURE;
1170
    }
1171
  }
1172

1173
  if (result == MAP_ARCHIVE_SUCCESS) {
1174
    SharedBaseAddress = (size_t)mapped_base_address;
1175
#ifdef _LP64
1176
        if (Metaspace::using_class_space()) {
1177
          // Set up ccs in metaspace.
1178
          Metaspace::initialize_class_space(class_space_rs);
1179

1180
          // Set up compressed Klass pointer encoding: the encoding range must
1181
          //  cover both archive and class space.
1182
          address cds_base = (address)static_mapinfo->mapped_base();
1183
          address ccs_end = (address)class_space_rs.end();
1184
          assert(ccs_end > cds_base, "Sanity check");
1185
#if INCLUDE_CDS_JAVA_HEAP
1186
          // We archived objects with pre-computed narrow Klass id. Set up encoding such that these Ids stay valid.
1187
          address precomputed_narrow_klass_base = cds_base;
1188
          const int precomputed_narrow_klass_shift = ArchiveHeapWriter::precomputed_narrow_klass_shift;
1189
          CompressedKlassPointers::initialize_for_given_encoding(
1190
            cds_base, ccs_end - cds_base, // Klass range
1191
            precomputed_narrow_klass_base, precomputed_narrow_klass_shift // precomputed encoding, see ArchiveHeapWriter
1192
            );
1193
#else
1194
          CompressedKlassPointers::initialize (
1195
            cds_base, ccs_end - cds_base // Klass range
1196
            );
1197
#endif // INCLUDE_CDS_JAVA_HEAP
1198
          // map_or_load_heap_region() compares the current narrow oop and klass encodings
1199
          // with the archived ones, so it must be done after all encodings are determined.
1200
          static_mapinfo->map_or_load_heap_region();
1201
        }
1202
#endif // _LP64
1203
    log_info(cds)("initial optimized module handling: %s", CDSConfig::is_using_optimized_module_handling() ? "enabled" : "disabled");
1204
    log_info(cds)("initial full module graph: %s", CDSConfig::is_using_full_module_graph() ? "enabled" : "disabled");
1205
  } else {
1206
    unmap_archive(static_mapinfo);
1207
    unmap_archive(dynamic_mapinfo);
1208
    release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1209
  }
1210

1211
  return result;
1212
}
1213

1214

1215
// This will reserve two address spaces suitable to house Klass structures, one
1216
//  for the cds archives (static archive and optionally dynamic archive) and
1217
//  optionally one move for ccs.
1218
//
1219
// Since both spaces must fall within the compressed class pointer encoding
1220
//  range, they are allocated close to each other.
1221
//
1222
// Space for archives will be reserved first, followed by a potential gap,
1223
//  followed by the space for ccs:
1224
//
1225
// +-- Base address             A        B                     End
1226
// |                            |        |                      |
1227
// v                            v        v                      v
1228
// +-------------+--------------+        +----------------------+
1229
// | static arc  | [dyn. arch]  | [gap]  | compr. class space   |
1230
// +-------------+--------------+        +----------------------+
1231
//
1232
// (The gap may result from different alignment requirements between metaspace
1233
//  and CDS)
1234
//
1235
// If UseCompressedClassPointers is disabled, only one address space will be
1236
//  reserved:
1237
//
1238
// +-- Base address             End
1239
// |                            |
1240
// v                            v
1241
// +-------------+--------------+
1242
// | static arc  | [dyn. arch]  |
1243
// +-------------+--------------+
1244
//
1245
// Base address: If use_archive_base_addr address is true, the Base address is
1246
//  determined by the address stored in the static archive. If
1247
//  use_archive_base_addr address is false, this base address is determined
1248
//  by the platform.
1249
//
1250
// If UseCompressedClassPointers=1, the range encompassing both spaces will be
1251
//  suitable to en/decode narrow Klass pointers: the base will be valid for
1252
//  encoding, the range [Base, End) not surpass KlassEncodingMetaspaceMax.
1253
//
1254
// Return:
1255
//
1256
// - On success:
1257
//    - total_space_rs will be reserved as whole for archive_space_rs and
1258
//      class_space_rs if UseCompressedClassPointers is true.
1259
//      On Windows, try reserve archive_space_rs and class_space_rs
1260
//      separately first if use_archive_base_addr is true.
1261
//    - archive_space_rs will be reserved and large enough to host static and
1262
//      if needed dynamic archive: [Base, A).
1263
//      archive_space_rs.base and size will be aligned to CDS reserve
1264
//      granularity.
1265
//    - class_space_rs: If UseCompressedClassPointers=1, class_space_rs will
1266
//      be reserved. Its start address will be aligned to metaspace reserve
1267
//      alignment, which may differ from CDS alignment. It will follow the cds
1268
//      archive space, close enough such that narrow class pointer encoding
1269
//      covers both spaces.
1270
//      If UseCompressedClassPointers=0, class_space_rs remains unreserved.
1271
// - On error: null is returned and the spaces remain unreserved.
1272
char* MetaspaceShared::reserve_address_space_for_archives(FileMapInfo* static_mapinfo,
1273
                                                          FileMapInfo* dynamic_mapinfo,
1274
                                                          bool use_archive_base_addr,
1275
                                                          ReservedSpace& total_space_rs,
1276
                                                          ReservedSpace& archive_space_rs,
1277
                                                          ReservedSpace& class_space_rs) {
1278

1279
  address const base_address = (address) (use_archive_base_addr ? static_mapinfo->requested_base_address() : nullptr);
1280
  const size_t archive_space_alignment = core_region_alignment();
1281

1282
  // Size and requested location of the archive_space_rs (for both static and dynamic archives)
1283
  assert(static_mapinfo->mapping_base_offset() == 0, "Must be");
1284
  size_t archive_end_offset  = (dynamic_mapinfo == nullptr) ? static_mapinfo->mapping_end_offset() : dynamic_mapinfo->mapping_end_offset();
1285
  size_t archive_space_size = align_up(archive_end_offset, archive_space_alignment);
1286

1287
  if (!Metaspace::using_class_space()) {
1288
    // Get the simple case out of the way first:
1289
    // no compressed class space, simple allocation.
1290

1291
    // When running without class space, requested archive base should be aligned to cds core alignment.
1292
    assert(is_aligned(base_address, archive_space_alignment),
1293
             "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1294
             p2i(base_address), archive_space_alignment);
1295

1296
    archive_space_rs = ReservedSpace(archive_space_size, archive_space_alignment,
1297
                                     os::vm_page_size(), (char*)base_address);
1298
    if (archive_space_rs.is_reserved()) {
1299
      assert(base_address == nullptr ||
1300
             (address)archive_space_rs.base() == base_address, "Sanity");
1301
      // Register archive space with NMT.
1302
      MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
1303
      return archive_space_rs.base();
1304
    }
1305
    return nullptr;
1306
  }
1307

1308
#ifdef _LP64
1309

1310
  // Complex case: two spaces adjacent to each other, both to be addressable
1311
  //  with narrow class pointers.
1312
  // We reserve the whole range spanning both spaces, then split that range up.
1313

1314
  const size_t class_space_alignment = Metaspace::reserve_alignment();
1315

1316
  // When running with class space, requested archive base must satisfy both cds core alignment
1317
  // and class space alignment.
1318
  const size_t base_address_alignment = MAX2(class_space_alignment, archive_space_alignment);
1319
  assert(is_aligned(base_address, base_address_alignment),
1320
           "Archive base address unaligned: " PTR_FORMAT ", needs alignment: %zu.",
1321
           p2i(base_address), base_address_alignment);
1322

1323
  size_t class_space_size = CompressedClassSpaceSize;
1324
  assert(CompressedClassSpaceSize > 0 &&
1325
         is_aligned(CompressedClassSpaceSize, class_space_alignment),
1326
         "CompressedClassSpaceSize malformed: "
1327
         SIZE_FORMAT, CompressedClassSpaceSize);
1328

1329
  const size_t ccs_begin_offset = align_up(archive_space_size, class_space_alignment);
1330
  const size_t gap_size = ccs_begin_offset - archive_space_size;
1331

1332
  // Reduce class space size if it would not fit into the Klass encoding range
1333
  constexpr size_t max_encoding_range_size = 4 * G;
1334
  guarantee(archive_space_size < max_encoding_range_size - class_space_alignment, "Archive too large");
1335
  if ((archive_space_size + gap_size + class_space_size) > max_encoding_range_size) {
1336
    class_space_size = align_down(max_encoding_range_size - archive_space_size - gap_size, class_space_alignment);
1337
    log_info(metaspace)("CDS initialization: reducing class space size from " SIZE_FORMAT " to " SIZE_FORMAT,
1338
        CompressedClassSpaceSize, class_space_size);
1339
    FLAG_SET_ERGO(CompressedClassSpaceSize, class_space_size);
1340
  }
1341

1342
  const size_t total_range_size =
1343
      archive_space_size + gap_size + class_space_size;
1344

1345
  assert(total_range_size > ccs_begin_offset, "must be");
1346
  if (use_windows_memory_mapping() && use_archive_base_addr) {
1347
    if (base_address != nullptr) {
1348
      // On Windows, we cannot safely split a reserved memory space into two (see JDK-8255917).
1349
      // Hence, we optimistically reserve archive space and class space side-by-side. We only
1350
      // do this for use_archive_base_addr=true since for use_archive_base_addr=false case
1351
      // caller will not split the combined space for mapping, instead read the archive data
1352
      // via sequential file IO.
1353
      address ccs_base = base_address + archive_space_size + gap_size;
1354
      archive_space_rs = ReservedSpace(archive_space_size, archive_space_alignment,
1355
                                       os::vm_page_size(), (char*)base_address);
1356
      class_space_rs   = ReservedSpace(class_space_size, class_space_alignment,
1357
                                       os::vm_page_size(), (char*)ccs_base);
1358
    }
1359
    if (!archive_space_rs.is_reserved() || !class_space_rs.is_reserved()) {
1360
      release_reserved_spaces(total_space_rs, archive_space_rs, class_space_rs);
1361
      return nullptr;
1362
    }
1363
    // NMT: fix up the space tags
1364
    MemTracker::record_virtual_memory_type(archive_space_rs.base(), mtClassShared);
1365
    MemTracker::record_virtual_memory_type(class_space_rs.base(), mtClass);
1366
  } else {
1367
    if (use_archive_base_addr && base_address != nullptr) {
1368
      total_space_rs = ReservedSpace(total_range_size, base_address_alignment,
1369
                                     os::vm_page_size(), (char*) base_address);
1370
    } else {
1371
      // We did not manage to reserve at the preferred address, or were instructed to relocate. In that
1372
      // case we reserve wherever possible, but the start address needs to be encodable as narrow Klass
1373
      // encoding base since the archived heap objects contain nKlass IDs pre-calculated toward the start
1374
      // of the shared Metaspace. That prevents us from using zero-based encoding and therefore we won't
1375
      // try allocating in low-address regions.
1376
      total_space_rs = Metaspace::reserve_address_space_for_compressed_classes(total_range_size, false /* optimize_for_zero_base */);
1377
    }
1378

1379
    if (!total_space_rs.is_reserved()) {
1380
      return nullptr;
1381
    }
1382

1383
    // Paranoid checks:
1384
    assert(base_address == nullptr || (address)total_space_rs.base() == base_address,
1385
           "Sanity (" PTR_FORMAT " vs " PTR_FORMAT ")", p2i(base_address), p2i(total_space_rs.base()));
1386
    assert(is_aligned(total_space_rs.base(), base_address_alignment), "Sanity");
1387
    assert(total_space_rs.size() == total_range_size, "Sanity");
1388

1389
    // Now split up the space into ccs and cds archive. For simplicity, just leave
1390
    //  the gap reserved at the end of the archive space. Do not do real splitting.
1391
    archive_space_rs = total_space_rs.first_part(ccs_begin_offset,
1392
                                                 (size_t)archive_space_alignment);
1393
    class_space_rs = total_space_rs.last_part(ccs_begin_offset);
1394
    MemTracker::record_virtual_memory_split_reserved(total_space_rs.base(), total_space_rs.size(),
1395
                                                     ccs_begin_offset, mtClassShared, mtClass);
1396
  }
1397
  assert(is_aligned(archive_space_rs.base(), archive_space_alignment), "Sanity");
1398
  assert(is_aligned(archive_space_rs.size(), archive_space_alignment), "Sanity");
1399
  assert(is_aligned(class_space_rs.base(), class_space_alignment), "Sanity");
1400
  assert(is_aligned(class_space_rs.size(), class_space_alignment), "Sanity");
1401

1402

1403
  return archive_space_rs.base();
1404

1405
#else
1406
  ShouldNotReachHere();
1407
  return nullptr;
1408
#endif
1409

1410
}
1411

1412
void MetaspaceShared::release_reserved_spaces(ReservedSpace& total_space_rs,
1413
                                              ReservedSpace& archive_space_rs,
1414
                                              ReservedSpace& class_space_rs) {
1415
  if (total_space_rs.is_reserved()) {
1416
    log_debug(cds)("Released shared space (archive + class) " INTPTR_FORMAT, p2i(total_space_rs.base()));
1417
    total_space_rs.release();
1418
  } else {
1419
    if (archive_space_rs.is_reserved()) {
1420
      log_debug(cds)("Released shared space (archive) " INTPTR_FORMAT, p2i(archive_space_rs.base()));
1421
      archive_space_rs.release();
1422
    }
1423
    if (class_space_rs.is_reserved()) {
1424
      log_debug(cds)("Released shared space (classes) " INTPTR_FORMAT, p2i(class_space_rs.base()));
1425
      class_space_rs.release();
1426
    }
1427
  }
1428
}
1429

1430
static int archive_regions[]     = { MetaspaceShared::rw, MetaspaceShared::ro };
1431
static int archive_regions_count = 2;
1432

1433
MapArchiveResult MetaspaceShared::map_archive(FileMapInfo* mapinfo, char* mapped_base_address, ReservedSpace rs) {
1434
  assert(CDSConfig::is_using_archive(), "must be runtime");
1435
  if (mapinfo == nullptr) {
1436
    return MAP_ARCHIVE_SUCCESS; // The dynamic archive has not been specified. No error has happened -- trivially succeeded.
1437
  }
1438

1439
  mapinfo->set_is_mapped(false);
1440
  if (mapinfo->core_region_alignment() != (size_t)core_region_alignment()) {
1441
    log_info(cds)("Unable to map CDS archive -- core_region_alignment() expected: " SIZE_FORMAT
1442
                  " actual: " SIZE_FORMAT, mapinfo->core_region_alignment(), core_region_alignment());
1443
    return MAP_ARCHIVE_OTHER_FAILURE;
1444
  }
1445

1446
  MapArchiveResult result =
1447
    mapinfo->map_regions(archive_regions, archive_regions_count, mapped_base_address, rs);
1448

1449
  if (result != MAP_ARCHIVE_SUCCESS) {
1450
    unmap_archive(mapinfo);
1451
    return result;
1452
  }
1453

1454
  if (!mapinfo->validate_shared_path_table()) {
1455
    unmap_archive(mapinfo);
1456
    return MAP_ARCHIVE_OTHER_FAILURE;
1457
  }
1458

1459
  mapinfo->set_is_mapped(true);
1460
  return MAP_ARCHIVE_SUCCESS;
1461
}
1462

1463
void MetaspaceShared::unmap_archive(FileMapInfo* mapinfo) {
1464
  assert(CDSConfig::is_using_archive(), "must be runtime");
1465
  if (mapinfo != nullptr) {
1466
    mapinfo->unmap_regions(archive_regions, archive_regions_count);
1467
    mapinfo->unmap_region(MetaspaceShared::bm);
1468
    mapinfo->set_is_mapped(false);
1469
  }
1470
}
1471

1472
// For -XX:PrintSharedArchiveAndExit
1473
class CountSharedSymbols : public SymbolClosure {
1474
 private:
1475
   int _count;
1476
 public:
1477
   CountSharedSymbols() : _count(0) {}
1478
  void do_symbol(Symbol** sym) {
1479
    _count++;
1480
  }
1481
  int total() { return _count; }
1482

1483
};
1484

1485
// Read the miscellaneous data from the shared file, and
1486
// serialize it out to its various destinations.
1487

1488
void MetaspaceShared::initialize_shared_spaces() {
1489
  FileMapInfo *static_mapinfo = FileMapInfo::current_info();
1490

1491
  // Verify various attributes of the archive, plus initialize the
1492
  // shared string/symbol tables.
1493
  char* buffer = static_mapinfo->serialized_data();
1494
  intptr_t* array = (intptr_t*)buffer;
1495
  ReadClosure rc(&array);
1496
  serialize(&rc);
1497

1498
  // Finish up archived heap initialization. These must be
1499
  // done after ReadClosure.
1500
  static_mapinfo->patch_heap_embedded_pointers();
1501
  ArchiveHeapLoader::finish_initialization();
1502
  Universe::load_archived_object_instances();
1503

1504
  // Close the mapinfo file
1505
  static_mapinfo->close();
1506

1507
  static_mapinfo->unmap_region(MetaspaceShared::bm);
1508

1509
  FileMapInfo *dynamic_mapinfo = FileMapInfo::dynamic_info();
1510
  if (dynamic_mapinfo != nullptr) {
1511
    intptr_t* buffer = (intptr_t*)dynamic_mapinfo->serialized_data();
1512
    ReadClosure rc(&buffer);
1513
    ArchiveBuilder::serialize_dynamic_archivable_items(&rc);
1514
    DynamicArchive::setup_array_klasses();
1515
    dynamic_mapinfo->close();
1516
    dynamic_mapinfo->unmap_region(MetaspaceShared::bm);
1517
  }
1518

1519
  // Set up LambdaFormInvokers::_lambdaform_lines for dynamic dump
1520
  if (CDSConfig::is_dumping_dynamic_archive()) {
1521
    // Read stored LF format lines stored in static archive
1522
    LambdaFormInvokers::read_static_archive_invokers();
1523
  }
1524

1525
  if (PrintSharedArchiveAndExit) {
1526
    // Print archive names
1527
    if (dynamic_mapinfo != nullptr) {
1528
      tty->print_cr("\n\nBase archive name: %s", CDSConfig::static_archive_path());
1529
      tty->print_cr("Base archive version %d", static_mapinfo->version());
1530
    } else {
1531
      tty->print_cr("Static archive name: %s", static_mapinfo->full_path());
1532
      tty->print_cr("Static archive version %d", static_mapinfo->version());
1533
    }
1534

1535
    SystemDictionaryShared::print_shared_archive(tty);
1536
    if (dynamic_mapinfo != nullptr) {
1537
      tty->print_cr("\n\nDynamic archive name: %s", dynamic_mapinfo->full_path());
1538
      tty->print_cr("Dynamic archive version %d", dynamic_mapinfo->version());
1539
      SystemDictionaryShared::print_shared_archive(tty, false/*dynamic*/);
1540
    }
1541

1542
    // collect shared symbols and strings
1543
    CountSharedSymbols cl;
1544
    SymbolTable::shared_symbols_do(&cl);
1545
    tty->print_cr("Number of shared symbols: %d", cl.total());
1546
    tty->print_cr("Number of shared strings: %zu", StringTable::shared_entry_count());
1547
    tty->print_cr("VM version: %s\r\n", static_mapinfo->vm_version());
1548
    if (FileMapInfo::current_info() == nullptr || _archive_loading_failed) {
1549
      tty->print_cr("archive is invalid");
1550
      vm_exit(1);
1551
    } else {
1552
      tty->print_cr("archive is valid");
1553
      vm_exit(0);
1554
    }
1555
  }
1556
}
1557

1558
// JVM/TI RedefineClasses() support:
1559
bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
1560
  assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
1561

1562
  if (CDSConfig::is_using_archive()) {
1563
    // remap the shared readonly space to shared readwrite, private
1564
    FileMapInfo* mapinfo = FileMapInfo::current_info();
1565
    if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1566
      return false;
1567
    }
1568
    if (FileMapInfo::dynamic_info() != nullptr) {
1569
      mapinfo = FileMapInfo::dynamic_info();
1570
      if (!mapinfo->remap_shared_readonly_as_readwrite()) {
1571
        return false;
1572
      }
1573
    }
1574
    _remapped_readwrite = true;
1575
  }
1576
  return true;
1577
}
1578

1579
void MetaspaceShared::print_on(outputStream* st) {
1580
  if (CDSConfig::is_using_archive()) {
1581
    st->print("CDS archive(s) mapped at: ");
1582
    address base = (address)MetaspaceObj::shared_metaspace_base();
1583
    address static_top = (address)_shared_metaspace_static_top;
1584
    address top = (address)MetaspaceObj::shared_metaspace_top();
1585
    st->print("[" PTR_FORMAT "-" PTR_FORMAT "-" PTR_FORMAT "), ", p2i(base), p2i(static_top), p2i(top));
1586
    st->print("size " SIZE_FORMAT ", ", top - base);
1587
    st->print("SharedBaseAddress: " PTR_FORMAT ", ArchiveRelocationMode: %d.", SharedBaseAddress, ArchiveRelocationMode);
1588
  } else {
1589
    st->print("CDS archive(s) not mapped");
1590
  }
1591
  st->cr();
1592
}
1593