--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspaceShared.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,1960 @@
+/*
+ * Copyright (c) 2012, 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/classListParser.hpp"
+#include "classfile/classLoaderExt.hpp"
+#include "classfile/dictionary.hpp"
+#include "classfile/loaderConstraints.hpp"
+#include "classfile/placeholders.hpp"
+#include "classfile/sharedClassUtil.hpp"
+#include "classfile/symbolTable.hpp"
+#include "classfile/stringTable.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/systemDictionaryShared.hpp"
+#include "code/codeCache.hpp"
+#if INCLUDE_ALL_GCS
+#include "gc/g1/g1Allocator.inline.hpp"
+#include "gc/g1/g1CollectedHeap.hpp"
+#include "gc/g1/g1SATBCardTableModRefBS.hpp"
+#endif
+#include "gc/shared/gcLocker.hpp"
+#include "interpreter/bytecodeStream.hpp"
+#include "interpreter/bytecodes.hpp"
+#include "logging/log.hpp"
+#include "logging/logMessage.hpp"
+#include "memory/filemap.hpp"
+#include "memory/metaspace.hpp"
+#include "memory/metaspaceShared.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/instanceClassLoaderKlass.hpp"
+#include "oops/instanceMirrorKlass.hpp"
+#include "oops/instanceRefKlass.hpp"
+#include "oops/objArrayKlass.hpp"
+#include "oops/objArrayOop.hpp"
+#include "oops/oop.inline.hpp"
+#include "oops/typeArrayKlass.hpp"
+#include "prims/jvm.h"
+#include "prims/jvmtiRedefineClasses.hpp"
+#include "runtime/timerTrace.hpp"
+#include "runtime/os.hpp"
+#include "runtime/signature.hpp"
+#include "runtime/vmThread.hpp"
+#include "runtime/vm_operations.hpp"
+#include "utilities/align.hpp"
+#include "utilities/defaultStream.hpp"
+#include "utilities/hashtable.inline.hpp"
+#include "memory/metaspaceClosure.hpp"
+
+ReservedSpace MetaspaceShared::_shared_rs;
+VirtualSpace MetaspaceShared::_shared_vs;
+MetaspaceSharedStats MetaspaceShared::_stats;
+bool MetaspaceShared::_has_error_classes;
+bool MetaspaceShared::_archive_loading_failed = false;
+bool MetaspaceShared::_remapped_readwrite = false;
+bool MetaspaceShared::_open_archive_heap_region_mapped = false;
+address MetaspaceShared::_cds_i2i_entry_code_buffers = NULL;
+size_t MetaspaceShared::_cds_i2i_entry_code_buffers_size = 0;
+size_t MetaspaceShared::_core_spaces_size = 0;
+
+// The CDS archive is divided into the following regions:
+// mc - misc code (the method entry trampolines)
+// rw - read-write metadata
+// ro - read-only metadata and read-only tables
+// md - misc data (the c++ vtables)
+// od - optional data (original class files)
+//
+// s0 - shared strings(closed archive heap space) #0
+// s1 - shared strings(closed archive heap space) #1 (may be empty)
+// oa0 - open archive heap space #0
+// oa1 - open archive heap space #1 (may be empty)
+//
+// The mc, rw, ro, md and od regions are linearly allocated, starting from
+// SharedBaseAddress, in the order of mc->rw->ro->md->od. The size of these 5 regions
+// are page-aligned, and there's no gap between any consecutive regions.
+//
+// These 5 regions are populated in the following steps:
+// [1] All classes are loaded in MetaspaceShared::preload_classes(). All metadata are
+// temporarily allocated outside of the shared regions. Only the method entry
+// trampolines are written into the mc region.
+// [2] ArchiveCompactor copies RW metadata into the rw region.
+// [3] ArchiveCompactor copies RO metadata into the ro region.
+// [4] SymbolTable, StringTable, SystemDictionary, and a few other read-only data
+// are copied into the ro region as read-only tables.
+// [5] C++ vtables are copied into the md region.
+// [6] Original class files are copied into the od region.
+//
+// The s0/s1 and oa0/oa1 regions are populated inside MetaspaceShared::dump_java_heap_objects.
+// Their layout is independent of the other 5 regions.
+
+class DumpRegion {
+private:
+ const char* _name;
+ char* _base;
+ char* _top;
+ char* _end;
+ bool _is_packed;
+
+ char* expand_top_to(char* newtop) {
+ assert(is_allocatable(), "must be initialized and not packed");
+ assert(newtop >= _top, "must not grow backwards");
+ if (newtop > _end) {
+ MetaspaceShared::report_out_of_space(_name, newtop - _top);
+ ShouldNotReachHere();
+ }
+ MetaspaceShared::commit_shared_space_to(newtop);
+ _top = newtop;
+ return _top;
+ }
+
+public:
+ DumpRegion(const char* name) : _name(name), _base(NULL), _top(NULL), _end(NULL), _is_packed(false) {}
+
+ char* allocate(size_t num_bytes, size_t alignment=BytesPerWord) {
+ char* p = (char*)align_up(_top, alignment);
+ char* newtop = p + align_up(num_bytes, alignment);
+ expand_top_to(newtop);
+ memset(p, 0, newtop - p);
+ return p;
+ }
+
+ void append_intptr_t(intptr_t n) {
+ assert(is_aligned(_top, sizeof(intptr_t)), "bad alignment");
+ intptr_t *p = (intptr_t*)_top;
+ char* newtop = _top + sizeof(intptr_t);
+ expand_top_to(newtop);
+ *p = n;
+ }
+
+ char* base() const { return _base; }
+ char* top() const { return _top; }
+ char* end() const { return _end; }
+ size_t reserved() const { return _end - _base; }
+ size_t used() const { return _top - _base; }
+ bool is_packed() const { return _is_packed; }
+ bool is_allocatable() const {
+ return !is_packed() && _base != NULL;
+ }
+
+ double perc(size_t used, size_t total) const {
+ if (total == 0) {
+ total = 1;
+ }
+ return used / double(total) * 100.0;
+ }
+
+ void print(size_t total_bytes) const {
+ tty->print_cr("%s space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used] at " INTPTR_FORMAT,
+ _name, used(), perc(used(), total_bytes), reserved(), perc(used(), reserved()), p2i(_base));
+ }
+ void print_out_of_space_msg(const char* failing_region, size_t needed_bytes) {
+ tty->print("[%-8s] " PTR_FORMAT " - " PTR_FORMAT " capacity =%9d, allocated =%9d",
+ _name, p2i(_base), p2i(_top), int(_end - _base), int(_top - _base));
+ if (strcmp(_name, failing_region) == 0) {
+ tty->print_cr(" required = %d", int(needed_bytes));
+ } else {
+ tty->cr();
+ }
+ }
+
+ void init(const ReservedSpace* rs) {
+ _base = _top = rs->base();
+ _end = rs->end();
+ }
+ void init(char* b, char* t, char* e) {
+ _base = b;
+ _top = t;
+ _end = e;
+ }
+
+ void pack(DumpRegion* next = NULL) {
+ assert(!is_packed(), "sanity");
+ _end = (char*)align_up(_top, Metaspace::reserve_alignment());
+ _is_packed = true;
+ if (next != NULL) {
+ next->_base = next->_top = this->_end;
+ next->_end = MetaspaceShared::shared_rs()->end();
+ }
+ }
+ bool contains(char* p) {
+ return base() <= p && p < top();
+ }
+};
+
+
+DumpRegion _mc_region("mc"), _ro_region("ro"), _rw_region("rw"), _md_region("md"), _od_region("od");
+size_t _total_string_region_size = 0, _total_open_archive_region_size = 0;
+
+char* MetaspaceShared::misc_code_space_alloc(size_t num_bytes) {
+ return _mc_region.allocate(num_bytes);
+}
+
+char* MetaspaceShared::read_only_space_alloc(size_t num_bytes) {
+ return _ro_region.allocate(num_bytes);
+}
+
+void MetaspaceShared::initialize_shared_rs() {
+ const size_t reserve_alignment = Metaspace::reserve_alignment();
+ bool large_pages = false; // No large pages when dumping the CDS archive.
+ char* shared_base = (char*)align_up((char*)SharedBaseAddress, reserve_alignment);
+
+#ifdef _LP64
+ // On 64-bit VM, the heap and class space layout will be the same as if
+ // you're running in -Xshare:on mode:
+ //
+ // +-- SharedBaseAddress (default = 0x800000000)
+ // v
+ // +-..---------+----+ ... +----+----+----+----+----+---------------+
+ // | Heap | ST | | MC | RW | RO | MD | OD | class space |
+ // +-..---------+----+ ... +----+----+----+----+----+---------------+
+ // |<--MaxHeapSize->| |<-- UnscaledClassSpaceMax = 4GB ------->|
+ //
+ const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
+ const size_t cds_total = align_down(UnscaledClassSpaceMax, reserve_alignment);
+#else
+ // We don't support archives larger than 256MB on 32-bit due to limited virtual address space.
+ size_t cds_total = align_down(256*M, reserve_alignment);
+#endif
+
+ // First try to reserve the space at the specified SharedBaseAddress.
+ _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages, shared_base);
+ if (_shared_rs.is_reserved()) {
+ assert(shared_base == 0 || _shared_rs.base() == shared_base, "should match");
+ } else {
+ // Get a mmap region anywhere if the SharedBaseAddress fails.
+ _shared_rs = ReservedSpace(cds_total, reserve_alignment, large_pages);
+ }
+ if (!_shared_rs.is_reserved()) {
+ vm_exit_during_initialization("Unable to reserve memory for shared space",
+ err_msg(SIZE_FORMAT " bytes.", cds_total));
+ }
+
+#ifdef _LP64
+ // During dump time, we allocate 4GB (UnscaledClassSpaceMax) of space and split it up:
+ // + The upper 1 GB is used as the "temporary compressed class space" -- preload_classes()
+ // will store Klasses into this space.
+ // + The lower 3 GB is used for the archive -- when preload_classes() is done,
+ // ArchiveCompactor will copy the class metadata into this space, first the RW parts,
+ // then the RO parts.
+
+ assert(UseCompressedOops && UseCompressedClassPointers,
+ "UseCompressedOops and UseCompressedClassPointers must be set");
+
+ size_t max_archive_size = align_down(cds_total * 3 / 4, reserve_alignment);
+ ReservedSpace tmp_class_space = _shared_rs.last_part(max_archive_size);
+ CompressedClassSpaceSize = align_down(tmp_class_space.size(), reserve_alignment);
+ _shared_rs = _shared_rs.first_part(max_archive_size);
+
+ // Set up compress class pointers.
+ Universe::set_narrow_klass_base((address)_shared_rs.base());
+ if (UseAOT || cds_total > UnscaledClassSpaceMax) {
+ // AOT forces narrow_klass_shift=LogKlassAlignmentInBytes
+ Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes);
+ } else {
+ Universe::set_narrow_klass_shift(0);
+ }
+
+ Metaspace::initialize_class_space(tmp_class_space);
+ tty->print_cr("narrow_klass_base = " PTR_FORMAT ", narrow_klass_shift = %d",
+ p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift());
+
+ tty->print_cr("Allocated temporary class space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
+ CompressedClassSpaceSize, p2i(tmp_class_space.base()));
+#endif
+
+ // Start with 0 committed bytes. The memory will be committed as needed by
+ // MetaspaceShared::commit_shared_space_to().
+ if (!_shared_vs.initialize(_shared_rs, 0)) {
+ vm_exit_during_initialization("Unable to allocate memory for shared space");
+ }
+
+ _mc_region.init(&_shared_rs);
+ tty->print_cr("Allocated shared space: " SIZE_FORMAT " bytes at " PTR_FORMAT,
+ _shared_rs.size(), p2i(_shared_rs.base()));
+}
+
+void MetaspaceShared::commit_shared_space_to(char* newtop) {
+ assert(DumpSharedSpaces, "dump-time only");
+ char* base = _shared_rs.base();
+ size_t need_committed_size = newtop - base;
+ size_t has_committed_size = _shared_vs.committed_size();
+ if (need_committed_size < has_committed_size) {
+ return;
+ }
+
+ size_t min_bytes = need_committed_size - has_committed_size;
+ size_t preferred_bytes = 1 * M;
+ size_t uncommitted = _shared_vs.reserved_size() - has_committed_size;
+
+ size_t commit = MAX2(min_bytes, preferred_bytes);
+ assert(commit <= uncommitted, "sanity");
+
+ bool result = _shared_vs.expand_by(commit, false);
+ if (!result) {
+ vm_exit_during_initialization(err_msg("Failed to expand shared space to " SIZE_FORMAT " bytes",
+ need_committed_size));
+ }
+
+ log_info(cds)("Expanding shared spaces by " SIZE_FORMAT_W(7) " bytes [total " SIZE_FORMAT_W(9) " bytes ending at %p]",
+ commit, _shared_vs.actual_committed_size(), _shared_vs.high());
+}
+
+// Read/write a data stream for restoring/preserving metadata pointers and
+// miscellaneous data from/to the shared archive file.
+
+void MetaspaceShared::serialize(SerializeClosure* soc) {
+ int tag = 0;
+ soc->do_tag(--tag);
+
+ // Verify the sizes of various metadata in the system.
+ soc->do_tag(sizeof(Method));
+ soc->do_tag(sizeof(ConstMethod));
+ soc->do_tag(arrayOopDesc::base_offset_in_bytes(T_BYTE));
+ soc->do_tag(sizeof(ConstantPool));
+ soc->do_tag(sizeof(ConstantPoolCache));
+ soc->do_tag(objArrayOopDesc::base_offset_in_bytes());
+ soc->do_tag(typeArrayOopDesc::base_offset_in_bytes(T_BYTE));
+ soc->do_tag(sizeof(Symbol));
+
+ // Dump/restore miscellaneous metadata.
+ Universe::serialize(soc, true);
+ soc->do_tag(--tag);
+
+ // Dump/restore references to commonly used names and signatures.
+ vmSymbols::serialize(soc);
+ soc->do_tag(--tag);
+
+ // Dump/restore the symbol and string tables
+ SymbolTable::serialize(soc);
+ StringTable::serialize(soc);
+ soc->do_tag(--tag);
+
+ soc->do_tag(666);
+}
+
+address MetaspaceShared::cds_i2i_entry_code_buffers(size_t total_size) {
+ if (DumpSharedSpaces) {
+ if (_cds_i2i_entry_code_buffers == NULL) {
+ _cds_i2i_entry_code_buffers = (address)misc_code_space_alloc(total_size);
+ _cds_i2i_entry_code_buffers_size = total_size;
+ }
+ } else if (UseSharedSpaces) {
+ assert(_cds_i2i_entry_code_buffers != NULL, "must already been initialized");
+ } else {
+ return NULL;
+ }
+
+ assert(_cds_i2i_entry_code_buffers_size == total_size, "must not change");
+ return _cds_i2i_entry_code_buffers;
+}
+
+// CDS code for dumping shared archive.
+
+// Global object for holding classes that have been loaded. Since this
+// is run at a safepoint just before exit, this is the entire set of classes.
+static GrowableArray<Klass*>* _global_klass_objects;
+
+static void collect_array_classes(Klass* k) {
+ _global_klass_objects->append_if_missing(k);
+ if (k->is_array_klass()) {
+ // Add in the array classes too
+ ArrayKlass* ak = ArrayKlass::cast(k);
+ Klass* h = ak->higher_dimension();
+ if (h != NULL) {
+ h->array_klasses_do(collect_array_classes);
+ }
+ }
+}
+
+class CollectClassesClosure : public KlassClosure {
+ void do_klass(Klass* k) {
+ if (!(k->is_instance_klass() && InstanceKlass::cast(k)->is_in_error_state())) {
+ _global_klass_objects->append_if_missing(k);
+ }
+ if (k->is_array_klass()) {
+ // Add in the array classes too
+ ArrayKlass* ak = ArrayKlass::cast(k);
+ Klass* h = ak->higher_dimension();
+ if (h != NULL) {
+ h->array_klasses_do(collect_array_classes);
+ }
+ }
+ }
+};
+
+static void remove_unshareable_in_classes() {
+ for (int i = 0; i < _global_klass_objects->length(); i++) {
+ Klass* k = _global_klass_objects->at(i);
+ if (!k->is_objArray_klass()) {
+ // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
+ // on their array classes.
+ assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
+ k->remove_unshareable_info();
+ }
+ }
+}
+
+static void remove_java_mirror_in_classes() {
+ for (int i = 0; i < _global_klass_objects->length(); i++) {
+ Klass* k = _global_klass_objects->at(i);
+ if (!k->is_objArray_klass()) {
+ // InstanceKlass and TypeArrayKlass will in turn call remove_unshareable_info
+ // on their array classes.
+ assert(k->is_instance_klass() || k->is_typeArray_klass(), "must be");
+ k->remove_java_mirror();
+ }
+ }
+}
+
+static void rewrite_nofast_bytecode(Method* method) {
+ BytecodeStream bcs(method);
+ while (!bcs.is_last_bytecode()) {
+ Bytecodes::Code opcode = bcs.next();
+ switch (opcode) {
+ case Bytecodes::_getfield: *bcs.bcp() = Bytecodes::_nofast_getfield; break;
+ case Bytecodes::_putfield: *bcs.bcp() = Bytecodes::_nofast_putfield; break;
+ case Bytecodes::_aload_0: *bcs.bcp() = Bytecodes::_nofast_aload_0; break;
+ case Bytecodes::_iload: {
+ if (!bcs.is_wide()) {
+ *bcs.bcp() = Bytecodes::_nofast_iload;
+ }
+ break;
+ }
+ default: break;
+ }
+ }
+}
+
+// Walk all methods in the class list to ensure that they won't be modified at
+// run time. This includes:
+// [1] Rewrite all bytecodes as needed, so that the ConstMethod* will not be modified
+// at run time by RewriteBytecodes/RewriteFrequentPairs
+// [2] Assign a fingerprint, so one doesn't need to be assigned at run-time.
+static void rewrite_nofast_bytecodes_and_calculate_fingerprints() {
+ for (int i = 0; i < _global_klass_objects->length(); i++) {
+ Klass* k = _global_klass_objects->at(i);
+ if (k->is_instance_klass()) {
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ for (int i = 0; i < ik->methods()->length(); i++) {
+ Method* m = ik->methods()->at(i);
+ rewrite_nofast_bytecode(m);
+ Fingerprinter fp(m);
+ // The side effect of this call sets method's fingerprint field.
+ fp.fingerprint();
+ }
+ }
+ }
+}
+
+static void relocate_cached_class_file() {
+ for (int i = 0; i < _global_klass_objects->length(); i++) {
+ Klass* k = _global_klass_objects->at(i);
+ if (k->is_instance_klass()) {
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ JvmtiCachedClassFileData* p = ik->get_archived_class_data();
+ if (p != NULL) {
+ int size = offset_of(JvmtiCachedClassFileData, data) + p->length;
+ JvmtiCachedClassFileData* q = (JvmtiCachedClassFileData*)_od_region.allocate(size);
+ q->length = p->length;
+ memcpy(q->data, p->data, p->length);
+ ik->set_archived_class_data(q);
+ }
+ }
+ }
+}
+
+NOT_PRODUCT(
+static void assert_not_anonymous_class(InstanceKlass* k) {
+ assert(!(k->is_anonymous()), "cannot archive anonymous classes");
+}
+
+// Anonymous classes are not stored inside any dictionaries. They are created by
+// SystemDictionary::parse_stream() with a non-null host_klass.
+static void assert_no_anonymoys_classes_in_dictionaries() {
+ ClassLoaderDataGraph::dictionary_classes_do(assert_not_anonymous_class);
+})
+
+// Objects of the Metadata types (such as Klass and ConstantPool) have C++ vtables.
+// (In GCC this is the field <Type>::_vptr, i.e., first word in the object.)
+//
+// Addresses of the vtables and the methods may be different across JVM runs,
+// if libjvm.so is dynamically loaded at a different base address.
+//
+// To ensure that the Metadata objects in the CDS archive always have the correct vtable:
+//
+// + at dump time: we redirect the _vptr to point to our own vtables inside
+// the CDS image
+// + at run time: we clone the actual contents of the vtables from libjvm.so
+// into our own tables.
+
+// Currently, the archive contain ONLY the following types of objects that have C++ vtables.
+#define CPP_VTABLE_PATCH_TYPES_DO(f) \
+ f(ConstantPool) \
+ f(InstanceKlass) \
+ f(InstanceClassLoaderKlass) \
+ f(InstanceMirrorKlass) \
+ f(InstanceRefKlass) \
+ f(Method) \
+ f(ObjArrayKlass) \
+ f(TypeArrayKlass)
+
+class CppVtableInfo {
+ intptr_t _vtable_size;
+ intptr_t _cloned_vtable[1];
+public:
+ static int num_slots(int vtable_size) {
+ return 1 + vtable_size; // Need to add the space occupied by _vtable_size;
+ }
+ int vtable_size() { return int(uintx(_vtable_size)); }
+ void set_vtable_size(int n) { _vtable_size = intptr_t(n); }
+ intptr_t* cloned_vtable() { return &_cloned_vtable[0]; }
+ void zero() { memset(_cloned_vtable, 0, sizeof(intptr_t) * vtable_size()); }
+ // Returns the address of the next CppVtableInfo that can be placed immediately after this CppVtableInfo
+ static size_t byte_size(int vtable_size) {
+ CppVtableInfo i;
+ return pointer_delta(&i._cloned_vtable[vtable_size], &i, sizeof(u1));
+ }
+};
+
+template <class T> class CppVtableCloner : public T {
+ static intptr_t* vtable_of(Metadata& m) {
+ return *((intptr_t**)&m);
+ }
+ static CppVtableInfo* _info;
+
+ static int get_vtable_length(const char* name);
+
+public:
+ // Allocate and initialize the C++ vtable, starting from top, but do not go past end.
+ static intptr_t* allocate(const char* name);
+
+ // Clone the vtable to ...
+ static intptr_t* clone_vtable(const char* name, CppVtableInfo* info);
+
+ static void zero_vtable_clone() {
+ assert(DumpSharedSpaces, "dump-time only");
+ _info->zero();
+ }
+
+ // Switch the vtable pointer to point to the cloned vtable.
+ static void patch(Metadata* obj) {
+ assert(DumpSharedSpaces, "dump-time only");
+ *(void**)obj = (void*)(_info->cloned_vtable());
+ }
+
+ static bool is_valid_shared_object(const T* obj) {
+ intptr_t* vptr = *(intptr_t**)obj;
+ return vptr == _info->cloned_vtable();
+ }
+};
+
+template <class T> CppVtableInfo* CppVtableCloner<T>::_info = NULL;
+
+template <class T>
+intptr_t* CppVtableCloner<T>::allocate(const char* name) {
+ assert(is_aligned(_md_region.top(), sizeof(intptr_t)), "bad alignment");
+ int n = get_vtable_length(name);
+ _info = (CppVtableInfo*)_md_region.allocate(CppVtableInfo::byte_size(n), sizeof(intptr_t));
+ _info->set_vtable_size(n);
+
+ intptr_t* p = clone_vtable(name, _info);
+ assert((char*)p == _md_region.top(), "must be");
+
+ return p;
+}
+
+template <class T>
+intptr_t* CppVtableCloner<T>::clone_vtable(const char* name, CppVtableInfo* info) {
+ if (!DumpSharedSpaces) {
+ assert(_info == 0, "_info is initialized only at dump time");
+ _info = info; // Remember it -- it will be used by MetaspaceShared::is_valid_shared_method()
+ }
+ T tmp; // Allocate temporary dummy metadata object to get to the original vtable.
+ int n = info->vtable_size();
+ intptr_t* srcvtable = vtable_of(tmp);
+ intptr_t* dstvtable = info->cloned_vtable();
+
+ // We already checked (and, if necessary, adjusted n) when the vtables were allocated, so we are
+ // safe to do memcpy.
+ log_debug(cds, vtables)("Copying %3d vtable entries for %s", n, name);
+ memcpy(dstvtable, srcvtable, sizeof(intptr_t) * n);
+ return dstvtable + n;
+}
+
+// To determine the size of the vtable for each type, we use the following
+// trick by declaring 2 subclasses:
+//
+// class CppVtableTesterA: public InstanceKlass {virtual int last_virtual_method() {return 1;} };
+// class CppVtableTesterB: public InstanceKlass {virtual void* last_virtual_method() {return NULL}; };
+//
+// CppVtableTesterA and CppVtableTesterB's vtables have the following properties:
+// - Their size (N+1) is exactly one more than the size of InstanceKlass's vtable (N)
+// - The first N entries have are exactly the same as in InstanceKlass's vtable.
+// - Their last entry is different.
+//
+// So to determine the value of N, we just walk CppVtableTesterA and CppVtableTesterB's tables
+// and find the first entry that's different.
+//
+// This works on all C++ compilers supported by Oracle, but you may need to tweak it for more
+// esoteric compilers.
+
+template <class T> class CppVtableTesterB: public T {
+public:
+ virtual int last_virtual_method() {return 1;}
+};
+
+template <class T> class CppVtableTesterA : public T {
+public:
+ virtual void* last_virtual_method() {
+ // Make this different than CppVtableTesterB::last_virtual_method so the C++
+ // compiler/linker won't alias the two functions.
+ return NULL;
+ }
+};
+
+template <class T>
+int CppVtableCloner<T>::get_vtable_length(const char* name) {
+ CppVtableTesterA<T> a;
+ CppVtableTesterB<T> b;
+
+ intptr_t* avtable = vtable_of(a);
+ intptr_t* bvtable = vtable_of(b);
+
+ // Start at slot 1, because slot 0 may be RTTI (on Solaris/Sparc)
+ int vtable_len = 1;
+ for (; ; vtable_len++) {
+ if (avtable[vtable_len] != bvtable[vtable_len]) {
+ break;
+ }
+ }
+ log_debug(cds, vtables)("Found %3d vtable entries for %s", vtable_len, name);
+
+ return vtable_len;
+}
+
+#define ALLOC_CPP_VTABLE_CLONE(c) \
+ CppVtableCloner<c>::allocate(#c);
+
+#define CLONE_CPP_VTABLE(c) \
+ p = CppVtableCloner<c>::clone_vtable(#c, (CppVtableInfo*)p);
+
+#define ZERO_CPP_VTABLE(c) \
+ CppVtableCloner<c>::zero_vtable_clone();
+
+// This can be called at both dump time and run time.
+intptr_t* MetaspaceShared::clone_cpp_vtables(intptr_t* p) {
+ assert(DumpSharedSpaces || UseSharedSpaces, "sanity");
+ CPP_VTABLE_PATCH_TYPES_DO(CLONE_CPP_VTABLE);
+ return p;
+}
+
+void MetaspaceShared::zero_cpp_vtable_clones_for_writing() {
+ assert(DumpSharedSpaces, "dump-time only");
+ CPP_VTABLE_PATCH_TYPES_DO(ZERO_CPP_VTABLE);
+}
+
+// Allocate and initialize the C++ vtables, starting from top, but do not go past end.
+void MetaspaceShared::allocate_cpp_vtable_clones() {
+ assert(DumpSharedSpaces, "dump-time only");
+ // Layout (each slot is a intptr_t):
+ // [number of slots in the first vtable = n1]
+ // [ <n1> slots for the first vtable]
+ // [number of slots in the first second = n2]
+ // [ <n2> slots for the second vtable]
+ // ...
+ // The order of the vtables is the same as the CPP_VTAB_PATCH_TYPES_DO macro.
+ CPP_VTABLE_PATCH_TYPES_DO(ALLOC_CPP_VTABLE_CLONE);
+}
+
+// Switch the vtable pointer to point to the cloned vtable. We assume the
+// vtable pointer is in first slot in object.
+void MetaspaceShared::patch_cpp_vtable_pointers() {
+ int n = _global_klass_objects->length();
+ for (int i = 0; i < n; i++) {
+ Klass* obj = _global_klass_objects->at(i);
+ if (obj->is_instance_klass()) {
+ InstanceKlass* ik = InstanceKlass::cast(obj);
+ if (ik->is_class_loader_instance_klass()) {
+ CppVtableCloner<InstanceClassLoaderKlass>::patch(ik);
+ } else if (ik->is_reference_instance_klass()) {
+ CppVtableCloner<InstanceRefKlass>::patch(ik);
+ } else if (ik->is_mirror_instance_klass()) {
+ CppVtableCloner<InstanceMirrorKlass>::patch(ik);
+ } else {
+ CppVtableCloner<InstanceKlass>::patch(ik);
+ }
+ ConstantPool* cp = ik->constants();
+ CppVtableCloner<ConstantPool>::patch(cp);
+ for (int j = 0; j < ik->methods()->length(); j++) {
+ Method* m = ik->methods()->at(j);
+ CppVtableCloner<Method>::patch(m);
+ assert(CppVtableCloner<Method>::is_valid_shared_object(m), "must be");
+ }
+ } else if (obj->is_objArray_klass()) {
+ CppVtableCloner<ObjArrayKlass>::patch(obj);
+ } else {
+ assert(obj->is_typeArray_klass(), "sanity");
+ CppVtableCloner<TypeArrayKlass>::patch(obj);
+ }
+ }
+}
+
+bool MetaspaceShared::is_valid_shared_method(const Method* m) {
+ assert(is_in_shared_space(m), "must be");
+ return CppVtableCloner<Method>::is_valid_shared_object(m);
+}
+
+// Closure for serializing initialization data out to a data area to be
+// written to the shared file.
+
+class WriteClosure : public SerializeClosure {
+private:
+ DumpRegion* _dump_region;
+
+public:
+ WriteClosure(DumpRegion* r) {
+ _dump_region = r;
+ }
+
+ void do_ptr(void** p) {
+ _dump_region->append_intptr_t((intptr_t)*p);
+ }
+
+ void do_u4(u4* p) {
+ void* ptr = (void*)(uintx(*p));
+ do_ptr(&ptr);
+ }
+
+ void do_tag(int tag) {
+ _dump_region->append_intptr_t((intptr_t)tag);
+ }
+
+ void do_region(u_char* start, size_t size) {
+ assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
+ assert(size % sizeof(intptr_t) == 0, "bad size");
+ do_tag((int)size);
+ while (size > 0) {
+ _dump_region->append_intptr_t(*(intptr_t*)start);
+ start += sizeof(intptr_t);
+ size -= sizeof(intptr_t);
+ }
+ }
+
+ bool reading() const { return false; }
+};
+
+// This is for dumping detailed statistics for the allocations
+// in the shared spaces.
+class DumpAllocStats : public ResourceObj {
+public:
+
+ // Here's poor man's enum inheritance
+#define SHAREDSPACE_OBJ_TYPES_DO(f) \
+ METASPACE_OBJ_TYPES_DO(f) \
+ f(SymbolHashentry) \
+ f(SymbolBucket) \
+ f(StringHashentry) \
+ f(StringBucket) \
+ f(Other)
+
+ enum Type {
+ // Types are MetaspaceObj::ClassType, MetaspaceObj::SymbolType, etc
+ SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_DECLARE)
+ _number_of_types
+ };
+
+ static const char * type_name(Type type) {
+ switch(type) {
+ SHAREDSPACE_OBJ_TYPES_DO(METASPACE_OBJ_TYPE_NAME_CASE)
+ default:
+ ShouldNotReachHere();
+ return NULL;
+ }
+ }
+
+public:
+ enum { RO = 0, RW = 1 };
+
+ int _counts[2][_number_of_types];
+ int _bytes [2][_number_of_types];
+
+ DumpAllocStats() {
+ memset(_counts, 0, sizeof(_counts));
+ memset(_bytes, 0, sizeof(_bytes));
+ };
+
+ void record(MetaspaceObj::Type type, int byte_size, bool read_only) {
+ assert(int(type) >= 0 && type < MetaspaceObj::_number_of_types, "sanity");
+ int which = (read_only) ? RO : RW;
+ _counts[which][type] ++;
+ _bytes [which][type] += byte_size;
+ }
+
+ void record_other_type(int byte_size, bool read_only) {
+ int which = (read_only) ? RO : RW;
+ _bytes [which][OtherType] += byte_size;
+ }
+ void print_stats(int ro_all, int rw_all, int mc_all, int md_all);
+};
+
+void DumpAllocStats::print_stats(int ro_all, int rw_all, int mc_all, int md_all) {
+ // Calculate size of data that was not allocated by Metaspace::allocate()
+ MetaspaceSharedStats *stats = MetaspaceShared::stats();
+
+ // symbols
+ _counts[RO][SymbolHashentryType] = stats->symbol.hashentry_count;
+ _bytes [RO][SymbolHashentryType] = stats->symbol.hashentry_bytes;
+
+ _counts[RO][SymbolBucketType] = stats->symbol.bucket_count;
+ _bytes [RO][SymbolBucketType] = stats->symbol.bucket_bytes;
+
+ // strings
+ _counts[RO][StringHashentryType] = stats->string.hashentry_count;
+ _bytes [RO][StringHashentryType] = stats->string.hashentry_bytes;
+
+ _counts[RO][StringBucketType] = stats->string.bucket_count;
+ _bytes [RO][StringBucketType] = stats->string.bucket_bytes;
+
+ // TODO: count things like dictionary, vtable, etc
+ _bytes[RW][OtherType] += mc_all + md_all;
+ rw_all += mc_all + md_all; // mc/md are mapped Read/Write
+
+ // prevent divide-by-zero
+ if (ro_all < 1) {
+ ro_all = 1;
+ }
+ if (rw_all < 1) {
+ rw_all = 1;
+ }
+
+ int all_ro_count = 0;
+ int all_ro_bytes = 0;
+ int all_rw_count = 0;
+ int all_rw_bytes = 0;
+
+// To make fmt_stats be a syntactic constant (for format warnings), use #define.
+#define fmt_stats "%-20s: %8d %10d %5.1f | %8d %10d %5.1f | %8d %10d %5.1f"
+ const char *sep = "--------------------+---------------------------+---------------------------+--------------------------";
+ const char *hdr = " ro_cnt ro_bytes % | rw_cnt rw_bytes % | all_cnt all_bytes %";
+
+ ResourceMark rm;
+ LogMessage(cds) msg;
+ stringStream info_stream;
+
+ info_stream.print_cr("Detailed metadata info (excluding od/st regions; rw stats include md/mc regions):");
+ info_stream.print_cr("%s", hdr);
+ info_stream.print_cr("%s", sep);
+ for (int type = 0; type < int(_number_of_types); type ++) {
+ const char *name = type_name((Type)type);
+ int ro_count = _counts[RO][type];
+ int ro_bytes = _bytes [RO][type];
+ int rw_count = _counts[RW][type];
+ int rw_bytes = _bytes [RW][type];
+ int count = ro_count + rw_count;
+ int bytes = ro_bytes + rw_bytes;
+
+ double ro_perc = 100.0 * double(ro_bytes) / double(ro_all);
+ double rw_perc = 100.0 * double(rw_bytes) / double(rw_all);
+ double perc = 100.0 * double(bytes) / double(ro_all + rw_all);
+
+ info_stream.print_cr(fmt_stats, name,
+ ro_count, ro_bytes, ro_perc,
+ rw_count, rw_bytes, rw_perc,
+ count, bytes, perc);
+
+ all_ro_count += ro_count;
+ all_ro_bytes += ro_bytes;
+ all_rw_count += rw_count;
+ all_rw_bytes += rw_bytes;
+ }
+
+ int all_count = all_ro_count + all_rw_count;
+ int all_bytes = all_ro_bytes + all_rw_bytes;
+
+ double all_ro_perc = 100.0 * double(all_ro_bytes) / double(ro_all);
+ double all_rw_perc = 100.0 * double(all_rw_bytes) / double(rw_all);
+ double all_perc = 100.0 * double(all_bytes) / double(ro_all + rw_all);
+
+ info_stream.print_cr("%s", sep);
+ info_stream.print_cr(fmt_stats, "Total",
+ all_ro_count, all_ro_bytes, all_ro_perc,
+ all_rw_count, all_rw_bytes, all_rw_perc,
+ all_count, all_bytes, all_perc);
+
+ assert(all_ro_bytes == ro_all, "everything should have been counted");
+ assert(all_rw_bytes == rw_all, "everything should have been counted");
+
+ msg.info("%s", info_stream.as_string());
+#undef fmt_stats
+}
+
+// Populate the shared space.
+
+class VM_PopulateDumpSharedSpace: public VM_Operation {
+private:
+ GrowableArray<MemRegion> *_string_regions;
+ GrowableArray<MemRegion> *_open_archive_heap_regions;
+
+ void dump_java_heap_objects() NOT_CDS_JAVA_HEAP_RETURN;
+ void dump_symbols();
+ char* dump_read_only_tables();
+ void print_region_stats();
+ void print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
+ const char *name, const size_t total_size);
+public:
+
+ VMOp_Type type() const { return VMOp_PopulateDumpSharedSpace; }
+ void doit(); // outline because gdb sucks
+ static void write_region(FileMapInfo* mapinfo, int region, DumpRegion* space, bool read_only, bool allow_exec);
+}; // class VM_PopulateDumpSharedSpace
+
+class SortedSymbolClosure: public SymbolClosure {
+ GrowableArray<Symbol*> _symbols;
+ virtual void do_symbol(Symbol** sym) {
+ assert((*sym)->is_permanent(), "archived symbols must be permanent");
+ _symbols.append(*sym);
+ }
+ static int compare_symbols_by_address(Symbol** a, Symbol** b) {
+ if (a[0] < b[0]) {
+ return -1;
+ } else if (a[0] == b[0]) {
+ return 0;
+ } else {
+ return 1;
+ }
+ }
+
+public:
+ SortedSymbolClosure() {
+ SymbolTable::symbols_do(this);
+ _symbols.sort(compare_symbols_by_address);
+ }
+ GrowableArray<Symbol*>* get_sorted_symbols() {
+ return &_symbols;
+ }
+};
+
+// ArchiveCompactor --
+//
+// This class is the central piece of shared archive compaction -- all metaspace data are
+// initially allocated outside of the shared regions. ArchiveCompactor copies the
+// metaspace data into their final location in the shared regions.
+
+class ArchiveCompactor : AllStatic {
+ static DumpAllocStats* _alloc_stats;
+ static SortedSymbolClosure* _ssc;
+
+ static unsigned my_hash(const address& a) {
+ return primitive_hash<address>(a);
+ }
+ static bool my_equals(const address& a0, const address& a1) {
+ return primitive_equals<address>(a0, a1);
+ }
+ typedef ResourceHashtable<
+ address, address,
+ ArchiveCompactor::my_hash, // solaris compiler doesn't like: primitive_hash<address>
+ ArchiveCompactor::my_equals, // solaris compiler doesn't like: primitive_equals<address>
+ 16384, ResourceObj::C_HEAP> RelocationTable;
+ static RelocationTable* _new_loc_table;
+
+public:
+ static void initialize() {
+ _alloc_stats = new(ResourceObj::C_HEAP, mtInternal)DumpAllocStats;
+ _new_loc_table = new(ResourceObj::C_HEAP, mtInternal)RelocationTable;
+ }
+ static DumpAllocStats* alloc_stats() {
+ return _alloc_stats;
+ }
+
+ static void allocate(MetaspaceClosure::Ref* ref, bool read_only) {
+ address obj = ref->obj();
+ int bytes = ref->size() * BytesPerWord;
+ char* p;
+ size_t alignment = BytesPerWord;
+ char* oldtop;
+ char* newtop;
+
+ if (read_only) {
+ oldtop = _ro_region.top();
+ p = _ro_region.allocate(bytes, alignment);
+ newtop = _ro_region.top();
+ } else {
+ oldtop = _rw_region.top();
+ p = _rw_region.allocate(bytes, alignment);
+ newtop = _rw_region.top();
+ }
+ memcpy(p, obj, bytes);
+ bool isnew = _new_loc_table->put(obj, (address)p);
+ log_trace(cds)("Copy: " PTR_FORMAT " ==> " PTR_FORMAT " %d", p2i(obj), p2i(p), bytes);
+ assert(isnew, "must be");
+
+ _alloc_stats->record(ref->msotype(), int(newtop - oldtop), read_only);
+ if (ref->msotype() == MetaspaceObj::SymbolType) {
+ uintx delta = MetaspaceShared::object_delta(p);
+ if (delta > MAX_SHARED_DELTA) {
+ // This is just a sanity check and should not appear in any real world usage. This
+ // happens only if you allocate more than 2GB of Symbols and would require
+ // millions of shared classes.
+ vm_exit_during_initialization("Too many Symbols in the CDS archive",
+ "Please reduce the number of shared classes.");
+ }
+ }
+ }
+
+ static address get_new_loc(MetaspaceClosure::Ref* ref) {
+ address* pp = _new_loc_table->get(ref->obj());
+ assert(pp != NULL, "must be");
+ return *pp;
+ }
+
+private:
+ // Makes a shallow copy of visited MetaspaceObj's
+ class ShallowCopier: public UniqueMetaspaceClosure {
+ bool _read_only;
+ public:
+ ShallowCopier(bool read_only) : _read_only(read_only) {}
+
+ virtual void do_unique_ref(Ref* ref, bool read_only) {
+ if (read_only == _read_only) {
+ allocate(ref, read_only);
+ }
+ }
+ };
+
+ // Relocate embedded pointers within a MetaspaceObj's shallow copy
+ class ShallowCopyEmbeddedRefRelocator: public UniqueMetaspaceClosure {
+ public:
+ virtual void do_unique_ref(Ref* ref, bool read_only) {
+ address new_loc = get_new_loc(ref);
+ RefRelocator refer;
+ ref->metaspace_pointers_do_at(&refer, new_loc);
+ }
+ };
+
+ // Relocate a reference to point to its shallow copy
+ class RefRelocator: public MetaspaceClosure {
+ public:
+ virtual bool do_ref(Ref* ref, bool read_only) {
+ if (ref->not_null()) {
+ ref->update(get_new_loc(ref));
+ }
+ return false; // Do not recurse.
+ }
+ };
+
+#ifdef ASSERT
+ class IsRefInArchiveChecker: public MetaspaceClosure {
+ public:
+ virtual bool do_ref(Ref* ref, bool read_only) {
+ if (ref->not_null()) {
+ char* obj = (char*)ref->obj();
+ assert(_ro_region.contains(obj) || _rw_region.contains(obj),
+ "must be relocated to point to CDS archive");
+ }
+ return false; // Do not recurse.
+ }
+ };
+#endif
+
+public:
+ static void copy_and_compact() {
+ // We should no longer allocate anything from the metaspace, so that
+ // we can have a stable set of MetaspaceObjs to work with.
+ Metaspace::freeze();
+
+ ResourceMark rm;
+ SortedSymbolClosure the_ssc; // StackObj
+ _ssc = &the_ssc;
+
+ tty->print_cr("Scanning all metaspace objects ... ");
+ {
+ // allocate and shallow-copy RW objects, immediately following the MC region
+ tty->print_cr("Allocating RW objects ... ");
+ _mc_region.pack(&_rw_region);
+
+ ResourceMark rm;
+ ShallowCopier rw_copier(false);
+ iterate_roots(&rw_copier);
+ }
+ {
+ // allocate and shallow-copy of RO object, immediately following the RW region
+ tty->print_cr("Allocating RO objects ... ");
+ _rw_region.pack(&_ro_region);
+
+ ResourceMark rm;
+ ShallowCopier ro_copier(true);
+ iterate_roots(&ro_copier);
+ }
+ {
+ tty->print_cr("Relocating embedded pointers ... ");
+ ResourceMark rm;
+ ShallowCopyEmbeddedRefRelocator emb_reloc;
+ iterate_roots(&emb_reloc);
+ }
+ {
+ tty->print_cr("Relocating external roots ... ");
+ ResourceMark rm;
+ RefRelocator ext_reloc;
+ iterate_roots(&ext_reloc);
+ }
+
+#ifdef ASSERT
+ {
+ tty->print_cr("Verifying external roots ... ");
+ ResourceMark rm;
+ IsRefInArchiveChecker checker;
+ iterate_roots(&checker);
+ }
+#endif
+
+
+ // cleanup
+ _ssc = NULL;
+ }
+
+ // We must relocate the System::_well_known_klasses only after we have copied the
+ // java objects in during dump_java_heap_objects(): during the object copy, we operate on
+ // old objects which assert that their klass is the original klass.
+ static void relocate_well_known_klasses() {
+ {
+ tty->print_cr("Relocating SystemDictionary::_well_known_klasses[] ... ");
+ ResourceMark rm;
+ RefRelocator ext_reloc;
+ SystemDictionary::well_known_klasses_do(&ext_reloc);
+ }
+ // NOTE: after this point, we shouldn't have any globals that can reach the old
+ // objects.
+
+ // We cannot use any of the objects in the heap anymore (except for the objects
+ // in the CDS shared string regions) because their headers no longer point to
+ // valid Klasses.
+ }
+
+ static void iterate_roots(MetaspaceClosure* it) {
+ GrowableArray<Symbol*>* symbols = _ssc->get_sorted_symbols();
+ for (int i=0; i<symbols->length(); i++) {
+ it->push(symbols->adr_at(i));
+ }
+ if (_global_klass_objects != NULL) {
+ // Need to fix up the pointers
+ for (int i = 0; i < _global_klass_objects->length(); i++) {
+ // NOTE -- this requires that the vtable is NOT yet patched, or else we are hosed.
+ it->push(_global_klass_objects->adr_at(i));
+ }
+ }
+ FileMapInfo::metaspace_pointers_do(it);
+ SystemDictionary::classes_do(it);
+ Universe::metaspace_pointers_do(it);
+ SymbolTable::metaspace_pointers_do(it);
+ vmSymbols::metaspace_pointers_do(it);
+ }
+
+ static Klass* get_relocated_klass(Klass* orig_klass) {
+ address* pp = _new_loc_table->get((address)orig_klass);
+ assert(pp != NULL, "must be");
+ Klass* klass = (Klass*)(*pp);
+ assert(klass->is_klass(), "must be");
+ return klass;
+ }
+};
+
+DumpAllocStats* ArchiveCompactor::_alloc_stats;
+SortedSymbolClosure* ArchiveCompactor::_ssc;
+ArchiveCompactor::RelocationTable* ArchiveCompactor::_new_loc_table;
+
+void VM_PopulateDumpSharedSpace::write_region(FileMapInfo* mapinfo, int region_idx,
+ DumpRegion* dump_region, bool read_only, bool allow_exec) {
+ mapinfo->write_region(region_idx, dump_region->base(), dump_region->used(), read_only, allow_exec);
+}
+
+void VM_PopulateDumpSharedSpace::dump_symbols() {
+ tty->print_cr("Dumping symbol table ...");
+
+ NOT_PRODUCT(SymbolTable::verify());
+ SymbolTable::write_to_archive();
+}
+
+char* VM_PopulateDumpSharedSpace::dump_read_only_tables() {
+ char* oldtop = _ro_region.top();
+ // Reorder the system dictionary. Moving the symbols affects
+ // how the hash table indices are calculated.
+ SystemDictionary::reorder_dictionary_for_sharing();
+ tty->print("Removing java_mirror ... ");
+ remove_java_mirror_in_classes();
+ tty->print_cr("done. ");
+ NOT_PRODUCT(SystemDictionary::verify();)
+
+ size_t buckets_bytes = SystemDictionary::count_bytes_for_buckets();
+ char* buckets_top = _ro_region.allocate(buckets_bytes, sizeof(intptr_t));
+ SystemDictionary::copy_buckets(buckets_top, _ro_region.top());
+
+ size_t table_bytes = SystemDictionary::count_bytes_for_table();
+ char* table_top = _ro_region.allocate(table_bytes, sizeof(intptr_t));
+ SystemDictionary::copy_table(table_top, _ro_region.top());
+
+ // Write the other data to the output array.
+ WriteClosure wc(&_ro_region);
+ MetaspaceShared::serialize(&wc);
+
+ char* newtop = _ro_region.top();
+ ArchiveCompactor::alloc_stats()->record_other_type(int(newtop - oldtop), true);
+ return buckets_top;
+}
+
+void VM_PopulateDumpSharedSpace::doit() {
+ Thread* THREAD = VMThread::vm_thread();
+
+ NOT_PRODUCT(SystemDictionary::verify();)
+ // The following guarantee is meant to ensure that no loader constraints
+ // exist yet, since the constraints table is not shared. This becomes
+ // more important now that we don't re-initialize vtables/itables for
+ // shared classes at runtime, where constraints were previously created.
+ guarantee(SystemDictionary::constraints()->number_of_entries() == 0,
+ "loader constraints are not saved");
+ guarantee(SystemDictionary::placeholders()->number_of_entries() == 0,
+ "placeholders are not saved");
+ // Revisit and implement this if we prelink method handle call sites:
+ guarantee(SystemDictionary::invoke_method_table() == NULL ||
+ SystemDictionary::invoke_method_table()->number_of_entries() == 0,
+ "invoke method table is not saved");
+
+ // At this point, many classes have been loaded.
+ // Gather systemDictionary classes in a global array and do everything to
+ // that so we don't have to walk the SystemDictionary again.
+ _global_klass_objects = new GrowableArray<Klass*>(1000);
+ CollectClassesClosure collect_classes;
+ ClassLoaderDataGraph::loaded_classes_do(&collect_classes);
+
+ tty->print_cr("Number of classes %d", _global_klass_objects->length());
+ {
+ int num_type_array = 0, num_obj_array = 0, num_inst = 0;
+ for (int i = 0; i < _global_klass_objects->length(); i++) {
+ Klass* k = _global_klass_objects->at(i);
+ if (k->is_instance_klass()) {
+ num_inst ++;
+ } else if (k->is_objArray_klass()) {
+ num_obj_array ++;
+ } else {
+ assert(k->is_typeArray_klass(), "sanity");
+ num_type_array ++;
+ }
+ }
+ tty->print_cr(" instance classes = %5d", num_inst);
+ tty->print_cr(" obj array classes = %5d", num_obj_array);
+ tty->print_cr(" type array classes = %5d", num_type_array);
+ }
+
+ // Ensure the ConstMethods won't be modified at run-time
+ tty->print("Updating ConstMethods ... ");
+ rewrite_nofast_bytecodes_and_calculate_fingerprints();
+ tty->print_cr("done. ");
+
+ // Move classes from platform/system dictionaries into the boot dictionary
+ SystemDictionary::combine_shared_dictionaries();
+
+ // Remove all references outside the metadata
+ tty->print("Removing unshareable information ... ");
+ remove_unshareable_in_classes();
+ tty->print_cr("done. ");
+
+ // We don't support archiving anonymous classes. Verify that they are not stored in
+ // the any dictionaries.
+ NOT_PRODUCT(assert_no_anonymoys_classes_in_dictionaries());
+
+ SystemDictionaryShared::finalize_verification_constraints();
+
+ ArchiveCompactor::initialize();
+ ArchiveCompactor::copy_and_compact();
+
+ dump_symbols();
+
+ // Dump supported java heap objects
+ _string_regions = NULL;
+ _open_archive_heap_regions = NULL;
+ dump_java_heap_objects();
+
+ ArchiveCompactor::relocate_well_known_klasses();
+
+ char* read_only_tables_start = dump_read_only_tables();
+ _ro_region.pack(&_md_region);
+
+ char* vtbl_list = _md_region.top();
+ MetaspaceShared::allocate_cpp_vtable_clones();
+ _md_region.pack(&_od_region);
+
+ // Relocate the archived class file data into the od region
+ relocate_cached_class_file();
+ _od_region.pack();
+
+ // The 5 core spaces are allocated consecutively mc->rw->ro->md->od, so there total size
+ // is just the spaces between the two ends.
+ size_t core_spaces_size = _od_region.end() - _mc_region.base();
+ assert(core_spaces_size == (size_t)align_up(core_spaces_size, Metaspace::reserve_alignment()),
+ "should already be aligned");
+
+ // During patching, some virtual methods may be called, so at this point
+ // the vtables must contain valid methods (as filled in by CppVtableCloner::allocate).
+ MetaspaceShared::patch_cpp_vtable_pointers();
+
+ // The vtable clones contain addresses of the current process.
+ // We don't want to write these addresses into the archive.
+ MetaspaceShared::zero_cpp_vtable_clones_for_writing();
+
+ // Create and write the archive file that maps the shared spaces.
+
+ FileMapInfo* mapinfo = new FileMapInfo();
+ mapinfo->populate_header(os::vm_allocation_granularity());
+ mapinfo->set_read_only_tables_start(read_only_tables_start);
+ mapinfo->set_misc_data_patching_start(vtbl_list);
+ mapinfo->set_cds_i2i_entry_code_buffers(MetaspaceShared::cds_i2i_entry_code_buffers());
+ mapinfo->set_cds_i2i_entry_code_buffers_size(MetaspaceShared::cds_i2i_entry_code_buffers_size());
+ mapinfo->set_core_spaces_size(core_spaces_size);
+
+ for (int pass=1; pass<=2; pass++) {
+ if (pass == 1) {
+ // The first pass doesn't actually write the data to disk. All it
+ // does is to update the fields in the mapinfo->_header.
+ } else {
+ // After the first pass, the contents of mapinfo->_header are finalized,
+ // so we can compute the header's CRC, and write the contents of the header
+ // and the regions into disk.
+ mapinfo->open_for_write();
+ mapinfo->set_header_crc(mapinfo->compute_header_crc());
+ }
+ mapinfo->write_header();
+
+ // NOTE: md contains the trampoline code for method entries, which are patched at run time,
+ // so it needs to be read/write.
+ write_region(mapinfo, MetaspaceShared::mc, &_mc_region, /*read_only=*/false,/*allow_exec=*/true);
+ write_region(mapinfo, MetaspaceShared::rw, &_rw_region, /*read_only=*/false,/*allow_exec=*/false);
+ write_region(mapinfo, MetaspaceShared::ro, &_ro_region, /*read_only=*/true, /*allow_exec=*/false);
+ write_region(mapinfo, MetaspaceShared::md, &_md_region, /*read_only=*/false,/*allow_exec=*/false);
+ write_region(mapinfo, MetaspaceShared::od, &_od_region, /*read_only=*/true, /*allow_exec=*/false);
+
+ _total_string_region_size = mapinfo->write_archive_heap_regions(
+ _string_regions,
+ MetaspaceShared::first_string,
+ MetaspaceShared::max_strings);
+ _total_open_archive_region_size = mapinfo->write_archive_heap_regions(
+ _open_archive_heap_regions,
+ MetaspaceShared::first_open_archive_heap_region,
+ MetaspaceShared::max_open_archive_heap_region);
+ }
+
+ mapinfo->close();
+
+ // Restore the vtable in case we invoke any virtual methods.
+ MetaspaceShared::clone_cpp_vtables((intptr_t*)vtbl_list);
+
+ print_region_stats();
+
+ if (log_is_enabled(Info, cds)) {
+ ArchiveCompactor::alloc_stats()->print_stats(int(_ro_region.used()), int(_rw_region.used()),
+ int(_mc_region.used()), int(_md_region.used()));
+ }
+
+ if (PrintSystemDictionaryAtExit) {
+ SystemDictionary::print();
+ }
+ // There may be other pending VM operations that operate on the InstanceKlasses,
+ // which will fail because InstanceKlasses::remove_unshareable_info()
+ // has been called. Forget these operations and exit the VM directly.
+ vm_direct_exit(0);
+}
+
+void VM_PopulateDumpSharedSpace::print_region_stats() {
+ // Print statistics of all the regions
+ const size_t total_reserved = _ro_region.reserved() + _rw_region.reserved() +
+ _mc_region.reserved() + _md_region.reserved() +
+ _od_region.reserved() +
+ _total_string_region_size +
+ _total_open_archive_region_size;
+ const size_t total_bytes = _ro_region.used() + _rw_region.used() +
+ _mc_region.used() + _md_region.used() +
+ _od_region.used() +
+ _total_string_region_size +
+ _total_open_archive_region_size;
+ const double total_u_perc = total_bytes / double(total_reserved) * 100.0;
+
+ _mc_region.print(total_reserved);
+ _rw_region.print(total_reserved);
+ _ro_region.print(total_reserved);
+ _md_region.print(total_reserved);
+ _od_region.print(total_reserved);
+ print_heap_region_stats(_string_regions, "st", total_reserved);
+ print_heap_region_stats(_open_archive_heap_regions, "oa", total_reserved);
+
+ tty->print_cr("total : " SIZE_FORMAT_W(9) " [100.0%% of total] out of " SIZE_FORMAT_W(9) " bytes [%5.1f%% used]",
+ total_bytes, total_reserved, total_u_perc);
+}
+
+void VM_PopulateDumpSharedSpace::print_heap_region_stats(GrowableArray<MemRegion> *heap_mem,
+ const char *name, const size_t total_size) {
+ int arr_len = heap_mem == NULL ? 0 : heap_mem->length();
+ for (int i = 0; i < arr_len; i++) {
+ char* start = (char*)heap_mem->at(i).start();
+ size_t size = heap_mem->at(i).byte_size();
+ char* top = start + size;
+ tty->print_cr("%s%d space: " SIZE_FORMAT_W(9) " [ %4.1f%% of total] out of " SIZE_FORMAT_W(9) " bytes [100%% used] at " INTPTR_FORMAT,
+ name, i, size, size/double(total_size)*100.0, size, p2i(start));
+
+ }
+}
+
+// Update a Java object to point its Klass* to the new location after
+// shared archive has been compacted.
+void MetaspaceShared::relocate_klass_ptr(oop o) {
+ assert(DumpSharedSpaces, "sanity");
+ Klass* k = ArchiveCompactor::get_relocated_klass(o->klass());
+ o->set_klass(k);
+}
+
+class LinkSharedClassesClosure : public KlassClosure {
+ Thread* THREAD;
+ bool _made_progress;
+ public:
+ LinkSharedClassesClosure(Thread* thread) : THREAD(thread), _made_progress(false) {}
+
+ void reset() { _made_progress = false; }
+ bool made_progress() const { return _made_progress; }
+
+ void do_klass(Klass* k) {
+ if (k->is_instance_klass()) {
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ // Link the class to cause the bytecodes to be rewritten and the
+ // cpcache to be created. Class verification is done according
+ // to -Xverify setting.
+ _made_progress |= MetaspaceShared::try_link_class(ik, THREAD);
+ guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
+
+ ik->constants()->resolve_class_constants(THREAD);
+ }
+ }
+};
+
+class CheckSharedClassesClosure : public KlassClosure {
+ bool _made_progress;
+ public:
+ CheckSharedClassesClosure() : _made_progress(false) {}
+
+ void reset() { _made_progress = false; }
+ bool made_progress() const { return _made_progress; }
+ void do_klass(Klass* k) {
+ if (k->is_instance_klass() && InstanceKlass::cast(k)->check_sharing_error_state()) {
+ _made_progress = true;
+ }
+ }
+};
+
+void MetaspaceShared::check_shared_class_loader_type(Klass* k) {
+ if (k->is_instance_klass()) {
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ u2 loader_type = ik->loader_type();
+ ResourceMark rm;
+ guarantee(loader_type != 0,
+ "Class loader type is not set for this class %s", ik->name()->as_C_string());
+ }
+}
+
+void MetaspaceShared::link_and_cleanup_shared_classes(TRAPS) {
+ // We need to iterate because verification may cause additional classes
+ // to be loaded.
+ LinkSharedClassesClosure link_closure(THREAD);
+ do {
+ link_closure.reset();
+ ClassLoaderDataGraph::loaded_classes_do(&link_closure);
+ guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
+ } while (link_closure.made_progress());
+
+ if (_has_error_classes) {
+ // Mark all classes whose super class or interfaces failed verification.
+ CheckSharedClassesClosure check_closure;
+ do {
+ // Not completely sure if we need to do this iteratively. Anyway,
+ // we should come here only if there are unverifiable classes, which
+ // shouldn't happen in normal cases. So better safe than sorry.
+ check_closure.reset();
+ ClassLoaderDataGraph::loaded_classes_do(&check_closure);
+ } while (check_closure.made_progress());
+
+ if (IgnoreUnverifiableClassesDuringDump) {
+ // This is useful when running JCK or SQE tests. You should not
+ // enable this when running real apps.
+ SystemDictionary::remove_classes_in_error_state();
+ } else {
+ tty->print_cr("Please remove the unverifiable classes from your class list and try again");
+ exit(1);
+ }
+ }
+}
+
+void MetaspaceShared::prepare_for_dumping() {
+ Arguments::check_unsupported_dumping_properties();
+ ClassLoader::initialize_shared_path();
+ FileMapInfo::allocate_classpath_entry_table();
+}
+
+// Preload classes from a list, populate the shared spaces and dump to a
+// file.
+void MetaspaceShared::preload_and_dump(TRAPS) {
+ { TraceTime timer("Dump Shared Spaces", TRACETIME_LOG(Info, startuptime));
+ ResourceMark rm;
+ char class_list_path_str[JVM_MAXPATHLEN];
+ // Preload classes to be shared.
+ // Should use some os:: method rather than fopen() here. aB.
+ const char* class_list_path;
+ if (SharedClassListFile == NULL) {
+ // Construct the path to the class list (in jre/lib)
+ // Walk up two directories from the location of the VM and
+ // optionally tack on "lib" (depending on platform)
+ os::jvm_path(class_list_path_str, sizeof(class_list_path_str));
+ for (int i = 0; i < 3; i++) {
+ char *end = strrchr(class_list_path_str, *os::file_separator());
+ if (end != NULL) *end = '\0';
+ }
+ int class_list_path_len = (int)strlen(class_list_path_str);
+ if (class_list_path_len >= 3) {
+ if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
+ if (class_list_path_len < JVM_MAXPATHLEN - 4) {
+ jio_snprintf(class_list_path_str + class_list_path_len,
+ sizeof(class_list_path_str) - class_list_path_len,
+ "%slib", os::file_separator());
+ class_list_path_len += 4;
+ }
+ }
+ }
+ if (class_list_path_len < JVM_MAXPATHLEN - 10) {
+ jio_snprintf(class_list_path_str + class_list_path_len,
+ sizeof(class_list_path_str) - class_list_path_len,
+ "%sclasslist", os::file_separator());
+ }
+ class_list_path = class_list_path_str;
+ } else {
+ class_list_path = SharedClassListFile;
+ }
+
+ tty->print_cr("Loading classes to share ...");
+ _has_error_classes = false;
+ int class_count = preload_classes(class_list_path, THREAD);
+ if (ExtraSharedClassListFile) {
+ class_count += preload_classes(ExtraSharedClassListFile, THREAD);
+ }
+ tty->print_cr("Loading classes to share: done.");
+
+ log_info(cds)("Shared spaces: preloaded %d classes", class_count);
+
+ // Rewrite and link classes
+ tty->print_cr("Rewriting and linking classes ...");
+
+ // Link any classes which got missed. This would happen if we have loaded classes that
+ // were not explicitly specified in the classlist. E.g., if an interface implemented by class K
+ // fails verification, all other interfaces that were not specified in the classlist but
+ // are implemented by K are not verified.
+ link_and_cleanup_shared_classes(CATCH);
+ tty->print_cr("Rewriting and linking classes: done");
+
+ SystemDictionary::clear_invoke_method_table();
+
+ VM_PopulateDumpSharedSpace op;
+ VMThread::execute(&op);
+ }
+}
+
+
+int MetaspaceShared::preload_classes(const char* class_list_path, TRAPS) {
+ ClassListParser parser(class_list_path);
+ int class_count = 0;
+
+ while (parser.parse_one_line()) {
+ Klass* klass = ClassLoaderExt::load_one_class(&parser, THREAD);
+ if (HAS_PENDING_EXCEPTION) {
+ if (klass == NULL &&
+ (PENDING_EXCEPTION->klass()->name() == vmSymbols::java_lang_ClassNotFoundException())) {
+ // print a warning only when the pending exception is class not found
+ tty->print_cr("Preload Warning: Cannot find %s", parser.current_class_name());
+ }
+ CLEAR_PENDING_EXCEPTION;
+ }
+ if (klass != NULL) {
+ if (log_is_enabled(Trace, cds)) {
+ ResourceMark rm;
+ log_trace(cds)("Shared spaces preloaded: %s", klass->external_name());
+ }
+
+ InstanceKlass* ik = InstanceKlass::cast(klass);
+
+ // Link the class to cause the bytecodes to be rewritten and the
+ // cpcache to be created. The linking is done as soon as classes
+ // are loaded in order that the related data structures (klass and
+ // cpCache) are located together.
+ try_link_class(ik, THREAD);
+ guarantee(!HAS_PENDING_EXCEPTION, "exception in link_class");
+
+ class_count++;
+ }
+ }
+
+ return class_count;
+}
+
+// Returns true if the class's status has changed
+bool MetaspaceShared::try_link_class(InstanceKlass* ik, TRAPS) {
+ assert(DumpSharedSpaces, "should only be called during dumping");
+ if (ik->init_state() < InstanceKlass::linked) {
+ bool saved = BytecodeVerificationLocal;
+ if (!(ik->is_shared_boot_class())) {
+ // The verification decision is based on BytecodeVerificationRemote
+ // for non-system classes. Since we are using the NULL classloader
+ // to load non-system classes during dumping, we need to temporarily
+ // change BytecodeVerificationLocal to be the same as
+ // BytecodeVerificationRemote. Note this can cause the parent system
+ // classes also being verified. The extra overhead is acceptable during
+ // dumping.
+ BytecodeVerificationLocal = BytecodeVerificationRemote;
+ }
+ ik->link_class(THREAD);
+ if (HAS_PENDING_EXCEPTION) {
+ ResourceMark rm;
+ tty->print_cr("Preload Warning: Verification failed for %s",
+ ik->external_name());
+ CLEAR_PENDING_EXCEPTION;
+ ik->set_in_error_state();
+ _has_error_classes = true;
+ }
+ BytecodeVerificationLocal = saved;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+#if INCLUDE_CDS_JAVA_HEAP
+void VM_PopulateDumpSharedSpace::dump_java_heap_objects() {
+ if (!MetaspaceShared::is_heap_object_archiving_allowed()) {
+ if (log_is_enabled(Info, cds)) {
+ log_info(cds)(
+ "Archived java heap is not supported as UseG1GC, "
+ "UseCompressedOops and UseCompressedClassPointers are required."
+ "Current settings: UseG1GC=%s, UseCompressedOops=%s, UseCompressedClassPointers=%s.",
+ BOOL_TO_STR(UseG1GC), BOOL_TO_STR(UseCompressedOops),
+ BOOL_TO_STR(UseCompressedClassPointers));
+ }
+ return;
+ }
+
+ {
+ NoSafepointVerifier nsv;
+
+ // Cache for recording where the archived objects are copied to
+ MetaspaceShared::create_archive_object_cache();
+
+ tty->print_cr("Dumping String objects to closed archive heap region ...");
+ NOT_PRODUCT(StringTable::verify());
+ // The string space has maximum two regions. See FileMapInfo::write_archive_heap_regions() for details.
+ _string_regions = new GrowableArray<MemRegion>(2);
+ StringTable::write_to_archive(_string_regions);
+
+ tty->print_cr("Dumping objects to open archive heap region ...");
+ _open_archive_heap_regions = new GrowableArray<MemRegion>(2);
+ MetaspaceShared::dump_open_archive_heap_objects(_open_archive_heap_regions);
+
+ MetaspaceShared::destroy_archive_object_cache();
+ }
+
+ G1HeapVerifier::verify_archive_regions();
+}
+
+void MetaspaceShared::dump_open_archive_heap_objects(
+ GrowableArray<MemRegion> * open_archive) {
+ assert(UseG1GC, "Only support G1 GC");
+ assert(UseCompressedOops && UseCompressedClassPointers,
+ "Only support UseCompressedOops and UseCompressedClassPointers enabled");
+
+ Thread* THREAD = Thread::current();
+ G1CollectedHeap::heap()->begin_archive_alloc_range(true /* open */);
+
+ MetaspaceShared::archive_resolved_constants(THREAD);
+
+ G1CollectedHeap::heap()->end_archive_alloc_range(open_archive,
+ os::vm_allocation_granularity());
+}
+
+MetaspaceShared::ArchivedObjectCache* MetaspaceShared::_archive_object_cache = NULL;
+oop MetaspaceShared::archive_heap_object(oop obj, Thread* THREAD) {
+ assert(DumpSharedSpaces, "dump-time only");
+
+ ArchivedObjectCache* cache = MetaspaceShared::archive_object_cache();
+ oop* p = cache->get(obj);
+ if (p != NULL) {
+ // already archived
+ return *p;
+ }
+
+ int len = obj->size();
+ if (G1CollectedHeap::heap()->is_archive_alloc_too_large(len)) {
+ return NULL;
+ }
+
+ int hash = obj->identity_hash();
+ oop archived_oop = (oop)G1CollectedHeap::heap()->archive_mem_allocate(len);
+ if (archived_oop != NULL) {
+ Copy::aligned_disjoint_words((HeapWord*)obj, (HeapWord*)archived_oop, len);
+ relocate_klass_ptr(archived_oop);
+ cache->put(obj, archived_oop);
+ }
+ return archived_oop;
+}
+
+void MetaspaceShared::archive_resolved_constants(Thread* THREAD) {
+ int i;
+ for (i = 0; i < _global_klass_objects->length(); i++) {
+ Klass* k = _global_klass_objects->at(i);
+ if (k->is_instance_klass()) {
+ InstanceKlass* ik = InstanceKlass::cast(k);
+ ik->constants()->archive_resolved_references(THREAD);
+ }
+ }
+}
+
+void MetaspaceShared::fixup_mapped_heap_regions() {
+ FileMapInfo *mapinfo = FileMapInfo::current_info();
+ mapinfo->fixup_mapped_heap_regions();
+}
+#endif // INCLUDE_CDS_JAVA_HEAP
+
+// Closure for serializing initialization data in from a data area
+// (ptr_array) read from the shared file.
+
+class ReadClosure : public SerializeClosure {
+private:
+ intptr_t** _ptr_array;
+
+ inline intptr_t nextPtr() {
+ return *(*_ptr_array)++;
+ }
+
+public:
+ ReadClosure(intptr_t** ptr_array) { _ptr_array = ptr_array; }
+
+ void do_ptr(void** p) {
+ assert(*p == NULL, "initializing previous initialized pointer.");
+ intptr_t obj = nextPtr();
+ assert((intptr_t)obj >= 0 || (intptr_t)obj < -100,
+ "hit tag while initializing ptrs.");
+ *p = (void*)obj;
+ }
+
+ void do_u4(u4* p) {
+ intptr_t obj = nextPtr();
+ *p = (u4)(uintx(obj));
+ }
+
+ void do_tag(int tag) {
+ int old_tag;
+ old_tag = (int)(intptr_t)nextPtr();
+ // do_int(&old_tag);
+ assert(tag == old_tag, "old tag doesn't match");
+ FileMapInfo::assert_mark(tag == old_tag);
+ }
+
+ void do_region(u_char* start, size_t size) {
+ assert((intptr_t)start % sizeof(intptr_t) == 0, "bad alignment");
+ assert(size % sizeof(intptr_t) == 0, "bad size");
+ do_tag((int)size);
+ while (size > 0) {
+ *(intptr_t*)start = nextPtr();
+ start += sizeof(intptr_t);
+ size -= sizeof(intptr_t);
+ }
+ }
+
+ bool reading() const { return true; }
+};
+
+// Return true if given address is in the mapped shared space.
+bool MetaspaceShared::is_in_shared_space(const void* p) {
+ return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_space(p);
+}
+
+// Return true if given address is in the misc data region
+bool MetaspaceShared::is_in_shared_region(const void* p, int idx) {
+ return UseSharedSpaces && FileMapInfo::current_info()->is_in_shared_region(p, idx);
+}
+
+bool MetaspaceShared::is_in_trampoline_frame(address addr) {
+ if (UseSharedSpaces && is_in_shared_region(addr, MetaspaceShared::mc)) {
+ return true;
+ }
+ return false;
+}
+
+void MetaspaceShared::print_shared_spaces() {
+ if (UseSharedSpaces) {
+ FileMapInfo::current_info()->print_shared_spaces();
+ }
+}
+
+
+// Map shared spaces at requested addresses and return if succeeded.
+bool MetaspaceShared::map_shared_spaces(FileMapInfo* mapinfo) {
+ size_t image_alignment = mapinfo->alignment();
+
+#ifndef _WINDOWS
+ // Map in the shared memory and then map the regions on top of it.
+ // On Windows, don't map the memory here because it will cause the
+ // mappings of the regions to fail.
+ ReservedSpace shared_rs = mapinfo->reserve_shared_memory();
+ if (!shared_rs.is_reserved()) return false;
+#endif
+
+ assert(!DumpSharedSpaces, "Should not be called with DumpSharedSpaces");
+
+ char* _ro_base = NULL;
+ char* _rw_base = NULL;
+ char* _mc_base = NULL;
+ char* _md_base = NULL;
+ char* _od_base = NULL;
+
+ // Map each shared region
+ if ((_mc_base = mapinfo->map_region(mc)) != NULL &&
+ mapinfo->verify_region_checksum(mc) &&
+ (_rw_base = mapinfo->map_region(rw)) != NULL &&
+ mapinfo->verify_region_checksum(rw) &&
+ (_ro_base = mapinfo->map_region(ro)) != NULL &&
+ mapinfo->verify_region_checksum(ro) &&
+ (_md_base = mapinfo->map_region(md)) != NULL &&
+ mapinfo->verify_region_checksum(md) &&
+ (_od_base = mapinfo->map_region(od)) != NULL &&
+ mapinfo->verify_region_checksum(od) &&
+ (image_alignment == (size_t)os::vm_allocation_granularity()) &&
+ mapinfo->validate_classpath_entry_table()) {
+ // Success (no need to do anything)
+ return true;
+ } else {
+ // If there was a failure in mapping any of the spaces, unmap the ones
+ // that succeeded
+ if (_ro_base != NULL) mapinfo->unmap_region(ro);
+ if (_rw_base != NULL) mapinfo->unmap_region(rw);
+ if (_mc_base != NULL) mapinfo->unmap_region(mc);
+ if (_md_base != NULL) mapinfo->unmap_region(md);
+ if (_od_base != NULL) mapinfo->unmap_region(od);
+#ifndef _WINDOWS
+ // Release the entire mapped region
+ shared_rs.release();
+#endif
+ // If -Xshare:on is specified, print out the error message and exit VM,
+ // otherwise, set UseSharedSpaces to false and continue.
+ if (RequireSharedSpaces || PrintSharedArchiveAndExit) {
+ vm_exit_during_initialization("Unable to use shared archive.", "Failed map_region for using -Xshare:on.");
+ } else {
+ FLAG_SET_DEFAULT(UseSharedSpaces, false);
+ }
+ return false;
+ }
+}
+
+// Read the miscellaneous data from the shared file, and
+// serialize it out to its various destinations.
+
+void MetaspaceShared::initialize_shared_spaces() {
+ FileMapInfo *mapinfo = FileMapInfo::current_info();
+ _cds_i2i_entry_code_buffers = mapinfo->cds_i2i_entry_code_buffers();
+ _cds_i2i_entry_code_buffers_size = mapinfo->cds_i2i_entry_code_buffers_size();
+ _core_spaces_size = mapinfo->core_spaces_size();
+ char* buffer = mapinfo->misc_data_patching_start();
+ clone_cpp_vtables((intptr_t*)buffer);
+
+ // The rest of the data is now stored in the RW region
+ buffer = mapinfo->read_only_tables_start();
+ int sharedDictionaryLen = *(intptr_t*)buffer;
+ buffer += sizeof(intptr_t);
+ int number_of_entries = *(intptr_t*)buffer;
+ buffer += sizeof(intptr_t);
+ SystemDictionary::set_shared_dictionary((HashtableBucket<mtClass>*)buffer,
+ sharedDictionaryLen,
+ number_of_entries);
+ buffer += sharedDictionaryLen;
+
+ // The following data are the linked list elements
+ // (HashtableEntry objects) for the shared dictionary table.
+
+ int len = *(intptr_t*)buffer; // skip over shared dictionary entries
+ buffer += sizeof(intptr_t);
+ buffer += len;
+
+ // Verify various attributes of the archive, plus initialize the
+ // shared string/symbol tables
+ intptr_t* array = (intptr_t*)buffer;
+ ReadClosure rc(&array);
+ serialize(&rc);
+
+ // Initialize the run-time symbol table.
+ SymbolTable::create_table();
+
+ // Close the mapinfo file
+ mapinfo->close();
+
+ if (PrintSharedArchiveAndExit) {
+ if (PrintSharedDictionary) {
+ tty->print_cr("\nShared classes:\n");
+ SystemDictionary::print_shared(tty);
+ }
+ if (_archive_loading_failed) {
+ tty->print_cr("archive is invalid");
+ vm_exit(1);
+ } else {
+ tty->print_cr("archive is valid");
+ vm_exit(0);
+ }
+ }
+}
+
+// JVM/TI RedefineClasses() support:
+bool MetaspaceShared::remap_shared_readonly_as_readwrite() {
+ assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
+
+ if (UseSharedSpaces) {
+ // remap the shared readonly space to shared readwrite, private
+ FileMapInfo* mapinfo = FileMapInfo::current_info();
+ if (!mapinfo->remap_shared_readonly_as_readwrite()) {
+ return false;
+ }
+ _remapped_readwrite = true;
+ }
+ return true;
+}
+
+void MetaspaceShared::report_out_of_space(const char* name, size_t needed_bytes) {
+ // This is highly unlikely to happen on 64-bits because we have reserved a 4GB space.
+ // On 32-bit we reserve only 256MB so you could run out of space with 100,000 classes
+ // or so.
+ _mc_region.print_out_of_space_msg(name, needed_bytes);
+ _rw_region.print_out_of_space_msg(name, needed_bytes);
+ _ro_region.print_out_of_space_msg(name, needed_bytes);
+ _md_region.print_out_of_space_msg(name, needed_bytes);
+ _od_region.print_out_of_space_msg(name, needed_bytes);
+
+ vm_exit_during_initialization(err_msg("Unable to allocate from '%s' region", name),
+ "Please reduce the number of shared classes.");
+}