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jdk/src/hotspot/share/classfile/systemDictionaryShared.cpp
Yumin Qi f741e4ca74 8264735: Make dynamic dump repeatable 
Reviewed-by: ccheung, iklam
2021-07-07 19:41:45 +00:00

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/*
* Copyright (c) 2014, 2021, 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 "cds/archiveUtils.hpp"
#include "cds/archiveBuilder.hpp"
#include "cds/classListParser.hpp"
#include "cds/dynamicArchive.hpp"
#include "cds/filemap.hpp"
#include "cds/heapShared.hpp"
#include "cds/cdsProtectionDomain.hpp"
#include "cds/dumpTimeClassInfo.hpp"
#include "cds/metaspaceShared.hpp"
#include "cds/runTimeClassInfo.hpp"
#include "classfile/classFileStream.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/classLoaderData.inline.hpp"
#include "classfile/classLoaderDataGraph.hpp"
#include "classfile/classLoaderExt.hpp"
#include "classfile/dictionary.hpp"
#include "classfile/javaClasses.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/systemDictionary.hpp"
#include "classfile/systemDictionaryShared.hpp"
#include "classfile/verificationType.hpp"
#include "classfile/vmClasses.hpp"
#include "classfile/vmSymbols.hpp"
#include "interpreter/bootstrapInfo.hpp"
#include "jfr/jfrEvents.hpp"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allocation.hpp"
#include "memory/metadataFactory.hpp"
#include "memory/metaspaceClosure.hpp"
#include "memory/oopFactory.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/instanceKlass.hpp"
#include "oops/klass.inline.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "oops/oop.inline.hpp"
#include "oops/oopHandle.inline.hpp"
#include "oops/typeArrayOop.inline.hpp"
#include "runtime/arguments.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/mutexLocker.hpp"
#include "utilities/hashtable.inline.hpp"
#include "utilities/resourceHash.hpp"
#include "utilities/stringUtils.hpp"
DumpTimeSharedClassTable* SystemDictionaryShared::_dumptime_table = NULL;
DumpTimeSharedClassTable* SystemDictionaryShared::_cloned_dumptime_table = NULL;
DumpTimeLambdaProxyClassDictionary* SystemDictionaryShared::_dumptime_lambda_proxy_class_dictionary = NULL;
DumpTimeLambdaProxyClassDictionary* SystemDictionaryShared::_cloned_dumptime_lambda_proxy_class_dictionary = NULL;
// SystemDictionaries in the base layer static archive
RunTimeSharedDictionary SystemDictionaryShared::_builtin_dictionary;
RunTimeSharedDictionary SystemDictionaryShared::_unregistered_dictionary;
// SystemDictionaries in the top layer dynamic archive
RunTimeSharedDictionary SystemDictionaryShared::_dynamic_builtin_dictionary;
RunTimeSharedDictionary SystemDictionaryShared::_dynamic_unregistered_dictionary;
LambdaProxyClassDictionary SystemDictionaryShared::_lambda_proxy_class_dictionary;
LambdaProxyClassDictionary SystemDictionaryShared::_dynamic_lambda_proxy_class_dictionary;
DEBUG_ONLY(bool SystemDictionaryShared::_no_class_loading_should_happen = false;)
bool SystemDictionaryShared::_dump_in_progress = false;
InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader(
Symbol* class_name, Handle class_loader, TRAPS) {
assert(UseSharedSpaces, "must be");
InstanceKlass* ik = find_builtin_class(class_name);
if (ik != NULL && !ik->shared_loading_failed()) {
if ((SystemDictionary::is_system_class_loader(class_loader()) && ik->is_shared_app_class()) ||
(SystemDictionary::is_platform_class_loader(class_loader()) && ik->is_shared_platform_class())) {
SharedClassLoadingMark slm(THREAD, ik);
PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
Handle protection_domain =
CDSProtectionDomain::init_security_info(class_loader, ik, pkg_entry, CHECK_NULL);
return load_shared_class(ik, class_loader, protection_domain, NULL, pkg_entry, THREAD);
}
}
return NULL;
}
// This function is called for loading only UNREGISTERED classes
InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name,
Handle class_loader,
Handle protection_domain,
const ClassFileStream* cfs,
TRAPS) {
if (!UseSharedSpaces) {
return NULL;
}
if (class_name == NULL) { // don't do this for hidden classes
return NULL;
}
if (class_loader.is_null() ||
SystemDictionary::is_system_class_loader(class_loader()) ||
SystemDictionary::is_platform_class_loader(class_loader())) {
// Do nothing for the BUILTIN loaders.
return NULL;
}
const RunTimeClassInfo* record = find_record(&_unregistered_dictionary, &_dynamic_unregistered_dictionary, class_name);
if (record == NULL) {
return NULL;
}
int clsfile_size = cfs->length();
int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
if (!record->matches(clsfile_size, clsfile_crc32)) {
return NULL;
}
return acquire_class_for_current_thread(record->_klass, class_loader,
protection_domain, cfs,
THREAD);
}
InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
InstanceKlass *ik,
Handle class_loader,
Handle protection_domain,
const ClassFileStream *cfs,
TRAPS) {
ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
{
MutexLocker mu(THREAD, SharedDictionary_lock);
if (ik->class_loader_data() != NULL) {
// ik is already loaded (by this loader or by a different loader)
// or ik is being loaded by a different thread (by this loader or by a different loader)
return NULL;
}
// No other thread has acquired this yet, so give it to *this thread*
ik->set_class_loader_data(loader_data);
}
// No longer holding SharedDictionary_lock
// No need to lock, as <ik> can be held only by a single thread.
loader_data->add_class(ik);
// Get the package entry.
PackageEntry* pkg_entry = CDSProtectionDomain::get_package_entry_from_class(ik, class_loader);
// Load and check super/interfaces, restore unsharable info
InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain,
cfs, pkg_entry, THREAD);
if (shared_klass == NULL || HAS_PENDING_EXCEPTION) {
// TODO: clean up <ik> so it can be used again
return NULL;
}
return shared_klass;
}
void SystemDictionaryShared::start_dumping() {
MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
_dump_in_progress = true;
}
DumpTimeClassInfo* SystemDictionaryShared::find_or_allocate_info_for(InstanceKlass* k) {
MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
return find_or_allocate_info_for_locked(k);
}
DumpTimeClassInfo* SystemDictionaryShared::find_or_allocate_info_for_locked(InstanceKlass* k) {
assert_lock_strong(DumpTimeTable_lock);
if (_dumptime_table == NULL) {
_dumptime_table = new (ResourceObj::C_HEAP, mtClass) DumpTimeSharedClassTable;
}
return _dumptime_table->find_or_allocate_info_for(k, _dump_in_progress);
}
bool SystemDictionaryShared::check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info) {
if (MetaspaceShared::is_in_shared_metaspace(k)) {
// We have reached a super type that's already in the base archive. Treat it
// as "not excluded".
assert(DynamicDumpSharedSpaces, "must be");
return false;
}
if (info == NULL) {
info = _dumptime_table->get(k);
assert(info != NULL, "supertypes of any classes in _dumptime_table must either be shared, or must also be in _dumptime_table");
}
if (!info->has_checked_exclusion()) {
if (check_for_exclusion_impl(k)) {
info->set_excluded();
}
info->set_has_checked_exclusion();
}
return info->is_excluded();
}
// Returns true so the caller can do: return warn_excluded(".....");
bool SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
ResourceMark rm;
log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason);
return true;
}
bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
while (k) {
if (k->name()->equals("jdk/internal/event/Event")) {
return true;
}
k = k->java_super();
}
return false;
}
bool SystemDictionaryShared::is_registered_lambda_proxy_class(InstanceKlass* ik) {
DumpTimeClassInfo* info = _dumptime_table->get(ik);
return (info != NULL) ? info->_is_archived_lambda_proxy : false;
}
bool SystemDictionaryShared::is_early_klass(InstanceKlass* ik) {
DumpTimeClassInfo* info = _dumptime_table->get(ik);
return (info != NULL) ? info->is_early_klass() : false;
}
bool SystemDictionaryShared::is_hidden_lambda_proxy(InstanceKlass* ik) {
assert(ik->is_shared(), "applicable to only a shared class");
if (ik->is_hidden()) {
return true;
} else {
return false;
}
}
bool SystemDictionaryShared::check_for_exclusion_impl(InstanceKlass* k) {
if (k->is_in_error_state()) {
return warn_excluded(k, "In error state");
}
if (has_been_redefined(k)) {
return warn_excluded(k, "Has been redefined");
}
if (!k->is_hidden() && k->shared_classpath_index() < 0 && is_builtin(k)) {
// These are classes loaded from unsupported locations (such as those loaded by JVMTI native
// agent during dump time).
return warn_excluded(k, "Unsupported location");
}
if (k->signers() != NULL) {
// We cannot include signed classes in the archive because the certificates
// used during dump time may be different than those used during
// runtime (due to expiration, etc).
return warn_excluded(k, "Signed JAR");
}
if (is_jfr_event_class(k)) {
// We cannot include JFR event classes because they need runtime-specific
// instrumentation in order to work with -XX:FlightRecorderOptions:retransform=false.
// There are only a small number of these classes, so it's not worthwhile to
// support them and make CDS more complicated.
return warn_excluded(k, "JFR event class");
}
if (k->init_state() < InstanceKlass::linked) {
// In CDS dumping, we will attempt to link all classes. Those that fail to link will
// be recorded in DumpTimeClassInfo.
Arguments::assert_is_dumping_archive();
// TODO -- rethink how this can be handled.
// We should try to link ik, however, we can't do it here because
// 1. We are at VM exit
// 2. linking a class may cause other classes to be loaded, which means
// a custom ClassLoader.loadClass() may be called, at a point where the
// class loader doesn't expect it.
if (has_class_failed_verification(k)) {
return warn_excluded(k, "Failed verification");
} else {
if (k->can_be_verified_at_dumptime()) {
return warn_excluded(k, "Not linked");
}
}
}
if (DynamicDumpSharedSpaces && k->major_version() < 50 /*JAVA_6_VERSION*/) {
// In order to support old classes during dynamic dump, class rewriting needs to
// be reverted. This would result in more complex code and testing but not much gain.
ResourceMark rm;
log_warning(cds)("Pre JDK 6 class not supported by CDS: %u.%u %s",
k->major_version(), k->minor_version(), k->name()->as_C_string());
return true;
}
if (!k->can_be_verified_at_dumptime() && k->is_linked()) {
return warn_excluded(k, "Old class has been linked");
}
if (k->is_hidden() && !is_registered_lambda_proxy_class(k)) {
ResourceMark rm;
log_debug(cds)("Skipping %s: Hidden class", k->name()->as_C_string());
return true;
}
InstanceKlass* super = k->java_super();
if (super != NULL && check_for_exclusion(super, NULL)) {
ResourceMark rm;
log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
return true;
}
Array<InstanceKlass*>* interfaces = k->local_interfaces();
int len = interfaces->length();
for (int i = 0; i < len; i++) {
InstanceKlass* intf = interfaces->at(i);
if (check_for_exclusion(intf, NULL)) {
log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
return true;
}
}
return false; // false == k should NOT be excluded
}
bool SystemDictionaryShared::is_sharing_possible(ClassLoaderData* loader_data) {
oop class_loader = loader_data->class_loader();
return (class_loader == NULL ||
SystemDictionary::is_system_class_loader(class_loader) ||
SystemDictionary::is_platform_class_loader(class_loader));
}
bool SystemDictionaryShared::has_platform_or_app_classes() {
if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
return true;
}
if (DynamicArchive::is_mapped() &&
FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
return true;
}
return false;
}
// The following stack shows how this code is reached:
//
// [0] SystemDictionaryShared::find_or_load_shared_class()
// [1] JVM_FindLoadedClass
// [2] java.lang.ClassLoader.findLoadedClass0()
// [3] java.lang.ClassLoader.findLoadedClass()
// [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
// [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
// [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
// jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
//
// AppCDS supports fast class loading for these 2 built-in class loaders:
// jdk.internal.loader.ClassLoaders$PlatformClassLoader
// jdk.internal.loader.ClassLoaders$AppClassLoader
// with the following assumptions (based on the JDK core library source code):
//
// [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
// load the named class.
// [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
// [c] At this point, if we can find the named class inside the
// shared_dictionary, we can perform further checks (see
// SystemDictionary::is_shared_class_visible) to ensure that this class
// was loaded by the same class loader during dump time.
//
// Given these assumptions, we intercept the findLoadedClass() call to invoke
// SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
// the archive for the 2 built-in class loaders. This way,
// we can improve start-up because we avoid decoding the classfile,
// and avoid delegating to the parent loader.
//
// NOTE: there's a lot of assumption about the Java code. If any of that change, this
// needs to be redesigned.
InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
Symbol* name, Handle class_loader, TRAPS) {
InstanceKlass* k = NULL;
if (UseSharedSpaces) {
if (!has_platform_or_app_classes()) {
return NULL;
}
if (SystemDictionary::is_system_class_loader(class_loader()) ||
SystemDictionary::is_platform_class_loader(class_loader())) {
// Fix for 4474172; see evaluation for more details
class_loader = Handle(
THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader()));
ClassLoaderData *loader_data = register_loader(class_loader);
Dictionary* dictionary = loader_data->dictionary();
unsigned int d_hash = dictionary->compute_hash(name);
// Note: currently, find_or_load_shared_class is called only from
// JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
// which are parallel-capable loaders, so a lock here is NOT taken.
assert(get_loader_lock_or_null(class_loader) == NULL, "ObjectLocker not required");
{
MutexLocker mu(THREAD, SystemDictionary_lock);
InstanceKlass* check = dictionary->find_class(d_hash, name);
if (check != NULL) {
return check;
}
}
k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
if (k != NULL) {
SharedClassLoadingMark slm(THREAD, k);
k = find_or_define_instance_class(name, class_loader, k, CHECK_NULL);
}
}
}
return k;
}
class UnregisteredClassesTable : public ResourceHashtable<
Symbol*, InstanceKlass*,
primitive_hash<Symbol*>,
primitive_equals<Symbol*>,
15889, // prime number
ResourceObj::C_HEAP> {};
static UnregisteredClassesTable* _unregistered_classes_table = NULL;
bool SystemDictionaryShared::add_unregistered_class(Thread* current, InstanceKlass* klass) {
// We don't allow duplicated unregistered classes with the same name.
// We only archive the first class with that name that succeeds putting
// itself into the table.
Arguments::assert_is_dumping_archive();
MutexLocker ml(current, UnregisteredClassesTable_lock);
Symbol* name = klass->name();
if (_unregistered_classes_table == NULL) {
_unregistered_classes_table = new (ResourceObj::C_HEAP, mtClass)UnregisteredClassesTable();
}
bool created;
InstanceKlass** v = _unregistered_classes_table->put_if_absent(name, klass, &created);
if (created) {
name->increment_refcount();
}
return (klass == *v);
}
// true == class was successfully added; false == a duplicated class (with the same name) already exists.
bool SystemDictionaryShared::add_unregistered_class_for_static_archive(Thread* current, InstanceKlass* k) {
assert(DumpSharedSpaces, "only when dumping");
if (add_unregistered_class(current, k)) {
MutexLocker mu_r(current, Compile_lock); // add_to_hierarchy asserts this.
SystemDictionary::add_to_hierarchy(k);
return true;
} else {
return false;
}
}
// This function is called to lookup the super/interfaces of shared classes for
// unregistered loaders. E.g., SharedClass in the below example
// where "super:" (and optionally "interface:") have been specified.
//
// java/lang/Object id: 0
// Interface id: 2 super: 0 source: cust.jar
// SharedClass id: 4 super: 0 interfaces: 2 source: cust.jar
InstanceKlass* SystemDictionaryShared::lookup_super_for_unregistered_class(
Symbol* class_name, Symbol* super_name, bool is_superclass) {
assert(DumpSharedSpaces, "only when static dumping");
if (!ClassListParser::is_parsing_thread()) {
// Unregistered classes can be created only by ClassListParser::_parsing_thread.
return NULL;
}
ClassListParser* parser = ClassListParser::instance();
if (parser == NULL) {
// We're still loading the well-known classes, before the ClassListParser is created.
return NULL;
}
if (class_name->equals(parser->current_class_name())) {
// When this function is called, all the numbered super and interface types
// must have already been loaded. Hence this function is never recursively called.
if (is_superclass) {
return parser->lookup_super_for_current_class(super_name);
} else {
return parser->lookup_interface_for_current_class(super_name);
}
} else {
// The VM is not trying to resolve a super type of parser->current_class_name().
// Instead, it's resolving an error class (because parser->current_class_name() has
// failed parsing or verification). Don't do anything here.
return NULL;
}
}
void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
Arguments::assert_is_dumping_archive();
assert(!is_builtin(k), "must be unregistered class");
DumpTimeClassInfo* info = find_or_allocate_info_for(k);
if (info != NULL) {
info->_clsfile_size = cfs->length();
info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
}
}
void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
(void)find_or_allocate_info_for(k);
}
void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
DumpTimeClassInfo* p = _dumptime_table->get(k);
if (p == NULL) {
return;
}
if (p->_verifier_constraints != NULL) {
for (int i = 0; i < p->_verifier_constraints->length(); i++) {
DumpTimeClassInfo::DTVerifierConstraint constraint = p->_verifier_constraints->at(i);
if (constraint._name != NULL ) {
constraint._name->decrement_refcount();
}
if (constraint._from_name != NULL ) {
constraint._from_name->decrement_refcount();
}
}
FREE_C_HEAP_ARRAY(DumpTimeClassInfo::DTVerifierConstraint, p->_verifier_constraints);
p->_verifier_constraints = NULL;
FREE_C_HEAP_ARRAY(char, p->_verifier_constraint_flags);
p->_verifier_constraint_flags = NULL;
}
if (p->_loader_constraints != NULL) {
for (int i = 0; i < p->_loader_constraints->length(); i++) {
DumpTimeClassInfo::DTLoaderConstraint ld = p->_loader_constraints->at(i);
if (ld._name != NULL) {
ld._name->decrement_refcount();
}
}
FREE_C_HEAP_ARRAY(DumpTimeClassInfo::DTLoaderConstraint, p->_loader_constraints);
p->_loader_constraints = NULL;
}
_dumptime_table->remove(k);
}
void SystemDictionaryShared::handle_class_unloading(InstanceKlass* klass) {
remove_dumptime_info(klass);
if (_unregistered_classes_table != NULL) {
// Remove the class from _unregistered_classes_table: keep the entry but
// set it to NULL. This ensure no classes with the same name can be
// added again.
MutexLocker ml(Thread::current(), UnregisteredClassesTable_lock);
InstanceKlass** v = _unregistered_classes_table->get(klass->name());
if (v != NULL) {
*v = NULL;
}
}
}
// Check if a class or any of its supertypes has been redefined.
bool SystemDictionaryShared::has_been_redefined(InstanceKlass* k) {
if (k->has_been_redefined()) {
return true;
}
if (k->java_super() != NULL && has_been_redefined(k->java_super())) {
return true;
}
Array<InstanceKlass*>* interfaces = k->local_interfaces();
int len = interfaces->length();
for (int i = 0; i < len; i++) {
if (has_been_redefined(interfaces->at(i))) {
return true;
}
}
return false;
}
// k is a class before relocating by ArchiveBuilder
void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
ResourceMark rm;
const char* name = k->name()->as_C_string();
DumpTimeClassInfo* info = _dumptime_table->get(k);
assert(_no_class_loading_should_happen, "class loading must be disabled");
guarantee(info != NULL, "Class %s must be entered into _dumptime_table", name);
guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
if (is_builtin(k)) {
if (k->is_hidden()) {
assert(is_registered_lambda_proxy_class(k), "unexpected hidden class %s", name);
}
guarantee(!k->is_shared_unregistered_class(),
"Class loader type must be set for BUILTIN class %s", name);
} else {
guarantee(k->is_shared_unregistered_class(),
"Class loader type must not be set for UNREGISTERED class %s", name);
}
}
class UnregisteredClassesDuplicationChecker : StackObj {
GrowableArray<InstanceKlass*> _list;
Thread* _thread;
public:
UnregisteredClassesDuplicationChecker() : _thread(Thread::current()) {}
bool do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
if (!SystemDictionaryShared::is_builtin(k)) {
_list.append(k);
}
return true; // keep on iterating
}
static int compare_by_loader(InstanceKlass** a, InstanceKlass** b) {
ClassLoaderData* loader_a = a[0]->class_loader_data();
ClassLoaderData* loader_b = b[0]->class_loader_data();
if (loader_a != loader_b) {
return intx(loader_a) - intx(loader_b);
} else {
return intx(a[0]) - intx(b[0]);
}
}
void mark_duplicated_classes() {
// Two loaders may load two identical or similar hierarchies of classes. If we
// check for duplication in random order, we may end up excluding important base classes
// in both hierarchies, causing most of the classes to be excluded.
// We sort the classes by their loaders. This way we're likely to archive
// all classes in the one of the two hierarchies.
_list.sort(compare_by_loader);
for (int i = 0; i < _list.length(); i++) {
InstanceKlass* k = _list.at(i);
bool i_am_first = SystemDictionaryShared::add_unregistered_class(_thread, k);
if (!i_am_first) {
SystemDictionaryShared::warn_excluded(k, "Duplicated unregistered class");
SystemDictionaryShared::set_excluded_locked(k);
}
}
}
};
class ExcludeDumpTimeSharedClasses : StackObj {
public:
bool do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
SystemDictionaryShared::check_for_exclusion(k, &info);
return true; // keep on iterating
}
};
void SystemDictionaryShared::check_excluded_classes() {
assert(no_class_loading_should_happen(), "sanity");
assert_lock_strong(DumpTimeTable_lock);
if (DynamicDumpSharedSpaces) {
// Do this first -- if a base class is excluded due to duplication,
// all of its subclasses will also be excluded by ExcludeDumpTimeSharedClasses
ResourceMark rm;
UnregisteredClassesDuplicationChecker dup_checker;
_dumptime_table->iterate(&dup_checker);
dup_checker.mark_duplicated_classes();
}
ExcludeDumpTimeSharedClasses excl;
_dumptime_table->iterate(&excl);
_dumptime_table->update_counts();
}
bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
assert(_no_class_loading_should_happen, "sanity");
assert_lock_strong(DumpTimeTable_lock);
Arguments::assert_is_dumping_archive();
DumpTimeClassInfo* p = find_or_allocate_info_for_locked(k);
return (p == NULL) ? true : p->is_excluded();
}
void SystemDictionaryShared::set_excluded_locked(InstanceKlass* k) {
assert_lock_strong(DumpTimeTable_lock);
Arguments::assert_is_dumping_archive();
DumpTimeClassInfo* info = find_or_allocate_info_for_locked(k);
if (info != NULL) {
info->set_excluded();
}
}
void SystemDictionaryShared::set_excluded(InstanceKlass* k) {
Arguments::assert_is_dumping_archive();
DumpTimeClassInfo* info = find_or_allocate_info_for(k);
if (info != NULL) {
info->set_excluded();
}
}
void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
Arguments::assert_is_dumping_archive();
DumpTimeClassInfo* p = find_or_allocate_info_for(ik);
if (p != NULL) {
p->set_failed_verification();
}
}
bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
Arguments::assert_is_dumping_archive();
if (_dumptime_table == NULL) {
assert(DynamicDumpSharedSpaces, "sanity");
assert(ik->is_shared(), "must be a shared class in the static archive");
return false;
}
DumpTimeClassInfo* p = _dumptime_table->get(ik);
return (p == NULL) ? false : p->failed_verification();
}
class IterateDumpTimeSharedClassTable : StackObj {
MetaspaceClosure *_it;
public:
IterateDumpTimeSharedClassTable(MetaspaceClosure* it) : _it(it) {}
bool do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
assert_lock_strong(DumpTimeTable_lock);
if (k->is_loader_alive() && !info.is_excluded()) {
info.metaspace_pointers_do(_it);
}
return true; // keep on iterating
}
};
class IterateDumpTimeLambdaProxyClassDictionary : StackObj {
MetaspaceClosure *_it;
public:
IterateDumpTimeLambdaProxyClassDictionary(MetaspaceClosure* it) : _it(it) {}
bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
assert_lock_strong(DumpTimeTable_lock);
if (key.caller_ik()->is_loader_alive()) {
info.metaspace_pointers_do(_it);
key.metaspace_pointers_do(_it);
}
return true; // keep on iterating
}
};
void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) {
assert_lock_strong(DumpTimeTable_lock);
IterateDumpTimeSharedClassTable iter(it);
_dumptime_table->iterate(&iter);
if (_dumptime_lambda_proxy_class_dictionary != NULL) {
IterateDumpTimeLambdaProxyClassDictionary iter_lambda(it);
_dumptime_lambda_proxy_class_dictionary->iterate(&iter_lambda);
}
}
bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
Arguments::assert_is_dumping_archive();
DumpTimeClassInfo* info = find_or_allocate_info_for(k);
if (info != NULL) {
info->add_verification_constraint(k, name, from_name, from_field_is_protected,
from_is_array, from_is_object);
} else {
return true;
}
if (DynamicDumpSharedSpaces) {
// For dynamic dumping, we can resolve all the constraint classes for all class loaders during
// the initial run prior to creating the archive before vm exit. We will also perform verification
// check when running with the archive.
return false;
} else {
if (is_builtin(k)) {
// For builtin class loaders, we can try to complete the verification check at dump time,
// because we can resolve all the constraint classes. We will also perform verification check
// when running with the archive.
return false;
} else {
// For non-builtin class loaders, we cannot complete the verification check at dump time,
// because at dump time we don't know how to resolve classes for such loaders.
return true;
}
}
}
void SystemDictionaryShared::add_to_dump_time_lambda_proxy_class_dictionary(LambdaProxyClassKey& key,
InstanceKlass* proxy_klass) {
assert_lock_strong(DumpTimeTable_lock);
if (_dumptime_lambda_proxy_class_dictionary == NULL) {
_dumptime_lambda_proxy_class_dictionary =
new (ResourceObj::C_HEAP, mtClass) DumpTimeLambdaProxyClassDictionary;
}
DumpTimeLambdaProxyClassInfo* lambda_info = _dumptime_lambda_proxy_class_dictionary->get(key);
if (lambda_info == NULL) {
DumpTimeLambdaProxyClassInfo info;
info.add_proxy_klass(proxy_klass);
_dumptime_lambda_proxy_class_dictionary->put(key, info);
//lambda_info = _dumptime_lambda_proxy_class_dictionary->get(key);
//assert(lambda_info->_proxy_klass == proxy_klass, "must be"); // debug only -- remove
++_dumptime_lambda_proxy_class_dictionary->_count;
} else {
lambda_info->add_proxy_klass(proxy_klass);
}
}
void SystemDictionaryShared::add_lambda_proxy_class(InstanceKlass* caller_ik,
InstanceKlass* lambda_ik,
Symbol* invoked_name,
Symbol* invoked_type,
Symbol* method_type,
Method* member_method,
Symbol* instantiated_method_type,
TRAPS) {
assert(caller_ik->class_loader() == lambda_ik->class_loader(), "mismatched class loader");
assert(caller_ik->class_loader_data() == lambda_ik->class_loader_data(), "mismatched class loader data");
assert(java_lang_Class::class_data(lambda_ik->java_mirror()) == NULL, "must not have class data");
MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
lambda_ik->assign_class_loader_type();
lambda_ik->set_shared_classpath_index(caller_ik->shared_classpath_index());
InstanceKlass* nest_host = caller_ik->nest_host(CHECK);
assert(nest_host != NULL, "unexpected NULL nest_host");
DumpTimeClassInfo* info = _dumptime_table->get(lambda_ik);
if (info != NULL && !lambda_ik->is_non_strong_hidden() && is_builtin(lambda_ik) && is_builtin(caller_ik)
// Don't include the lambda proxy if its nest host is not in the "linked" state.
&& nest_host->is_linked()) {
// Set _is_archived_lambda_proxy in DumpTimeClassInfo so that the lambda_ik
// won't be excluded during dumping of shared archive. See ExcludeDumpTimeSharedClasses.
info->_is_archived_lambda_proxy = true;
info->set_nest_host(nest_host);
LambdaProxyClassKey key(caller_ik,
invoked_name,
invoked_type,
method_type,
member_method,
instantiated_method_type);
add_to_dump_time_lambda_proxy_class_dictionary(key, lambda_ik);
}
}
InstanceKlass* SystemDictionaryShared::get_shared_lambda_proxy_class(InstanceKlass* caller_ik,
Symbol* invoked_name,
Symbol* invoked_type,
Symbol* method_type,
Method* member_method,
Symbol* instantiated_method_type) {
MutexLocker ml(CDSLambda_lock, Mutex::_no_safepoint_check_flag);
LambdaProxyClassKey key(caller_ik, invoked_name, invoked_type,
method_type, member_method, instantiated_method_type);
const RunTimeLambdaProxyClassInfo* info = _lambda_proxy_class_dictionary.lookup(&key, key.hash(), 0);
if (info == NULL) {
// Try lookup from the dynamic lambda proxy class dictionary.
info = _dynamic_lambda_proxy_class_dictionary.lookup(&key, key.hash(), 0);
}
InstanceKlass* proxy_klass = NULL;
if (info != NULL) {
InstanceKlass* curr_klass = info->proxy_klass_head();
InstanceKlass* prev_klass = curr_klass;
if (curr_klass->lambda_proxy_is_available()) {
while (curr_klass->next_link() != NULL) {
prev_klass = curr_klass;
curr_klass = InstanceKlass::cast(curr_klass->next_link());
}
assert(curr_klass->is_hidden(), "must be");
assert(curr_klass->lambda_proxy_is_available(), "must be");
prev_klass->set_next_link(NULL);
proxy_klass = curr_klass;
proxy_klass->clear_lambda_proxy_is_available();
if (log_is_enabled(Debug, cds)) {
ResourceMark rm;
log_debug(cds)("Loaded lambda proxy: %s ", proxy_klass->external_name());
}
} else {
if (log_is_enabled(Debug, cds)) {
ResourceMark rm;
log_debug(cds)("Used all archived lambda proxy classes for: %s %s%s",
caller_ik->external_name(), invoked_name->as_C_string(), invoked_type->as_C_string());
}
}
}
return proxy_klass;
}
InstanceKlass* SystemDictionaryShared::get_shared_nest_host(InstanceKlass* lambda_ik) {
assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only");
RunTimeClassInfo* record = RunTimeClassInfo::get_for(lambda_ik);
return record->nest_host();
}
InstanceKlass* SystemDictionaryShared::prepare_shared_lambda_proxy_class(InstanceKlass* lambda_ik,
InstanceKlass* caller_ik, TRAPS) {
Handle class_loader(THREAD, caller_ik->class_loader());
Handle protection_domain;
PackageEntry* pkg_entry = caller_ik->package();
if (caller_ik->class_loader() != NULL) {
protection_domain = CDSProtectionDomain::init_security_info(class_loader, caller_ik, pkg_entry, CHECK_NULL);
}
InstanceKlass* shared_nest_host = get_shared_nest_host(lambda_ik);
assert(shared_nest_host != NULL, "unexpected NULL _nest_host");
InstanceKlass* loaded_lambda =
SystemDictionary::load_shared_lambda_proxy_class(lambda_ik, class_loader, protection_domain, pkg_entry, CHECK_NULL);
if (loaded_lambda == NULL) {
return NULL;
}
// Ensures the nest host is the same as the lambda proxy's
// nest host recorded at dump time.
InstanceKlass* nest_host = caller_ik->nest_host(THREAD);
assert(nest_host == shared_nest_host, "mismatched nest host");
EventClassLoad class_load_start_event;
{
MutexLocker mu_r(THREAD, Compile_lock);
// Add to class hierarchy, and do possible deoptimizations.
SystemDictionary::add_to_hierarchy(loaded_lambda);
// But, do not add to dictionary.
}
loaded_lambda->link_class(CHECK_NULL);
// notify jvmti
if (JvmtiExport::should_post_class_load()) {
JvmtiExport::post_class_load(THREAD, loaded_lambda);
}
if (class_load_start_event.should_commit()) {
SystemDictionary::post_class_load_event(&class_load_start_event, loaded_lambda, ClassLoaderData::class_loader_data(class_loader()));
}
loaded_lambda->initialize(CHECK_NULL);
return loaded_lambda;
}
void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
TRAPS) {
assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only");
RunTimeClassInfo* record = RunTimeClassInfo::get_for(klass);
int length = record->_num_verifier_constraints;
if (length > 0) {
for (int i = 0; i < length; i++) {
RunTimeClassInfo::RTVerifierConstraint* vc = record->verifier_constraint_at(i);
Symbol* name = vc->name();
Symbol* from_name = vc->from_name();
char c = record->verifier_constraint_flag(i);
if (log_is_enabled(Trace, cds, verification)) {
ResourceMark rm(THREAD);
log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
klass->external_name(), from_name->as_klass_external_name(),
name->as_klass_external_name(), c);
}
bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false;
bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false;
bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false;
bool ok = VerificationType::resolve_and_check_assignability(klass, name,
from_name, from_field_is_protected, from_is_array, from_is_object, CHECK);
if (!ok) {
ResourceMark rm(THREAD);
stringStream ss;
ss.print_cr("Bad type on operand stack");
ss.print_cr("Exception Details:");
ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
from_name->as_quoted_ascii(), name->as_quoted_ascii());
THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
}
}
}
}
static oop get_class_loader_by(char type) {
if (type == (char)ClassLoader::BOOT_LOADER) {
return (oop)NULL;
} else if (type == (char)ClassLoader::PLATFORM_LOADER) {
return SystemDictionary::java_platform_loader();
} else {
assert (type == (char)ClassLoader::APP_LOADER, "Sanity");
return SystemDictionary::java_system_loader();
}
}
// Record class loader constraints that are checked inside
// InstanceKlass::link_class(), so that these can be checked quickly
// at runtime without laying out the vtable/itables.
void SystemDictionaryShared::record_linking_constraint(Symbol* name, InstanceKlass* klass,
Handle loader1, Handle loader2) {
// A linking constraint check is executed when:
// - klass extends or implements type S
// - klass overrides method S.M(...) with X.M
// - If klass defines the method M, X is
// the same as klass.
// - If klass does not define the method M,
// X must be a supertype of klass and X.M is
// a default method defined by X.
// - loader1 = X->class_loader()
// - loader2 = S->class_loader()
// - loader1 != loader2
// - M's paramater(s) include an object type T
// We require that
// - whenever loader1 and loader2 try to
// resolve the type T, they must always resolve to
// the same InstanceKlass.
// NOTE: type T may or may not be currently resolved in
// either of these two loaders. The check itself does not
// try to resolve T.
oop klass_loader = klass->class_loader();
if (!is_system_class_loader(klass_loader) &&
!is_platform_class_loader(klass_loader)) {
// If klass is loaded by system/platform loaders, we can
// guarantee that klass and S must be loaded by the same
// respective loader between dump time and run time, and
// the exact same check on (name, loader1, loader2) will
// be executed. Hence, we can cache this check and execute
// it at runtime without walking the vtable/itables.
//
// This cannot be guaranteed for classes loaded by other
// loaders, so we bail.
return;
}
if (DumpSharedSpaces && !is_builtin(klass)) {
// During static dump, unregistered classes (those intended for
// custom loaders) are loaded by the boot loader. Need to
// exclude these for the same reason as above.
// This should be fixed by JDK-8261941.
return;
}
assert(klass_loader != NULL, "should not be called for boot loader");
assert(loader1 != loader2, "must be");
if (DynamicDumpSharedSpaces && Thread::current()->is_VM_thread()) {
// We are re-laying out the vtable/itables of the *copy* of
// a class during the final stage of dynamic dumping. The
// linking constraints for this class has already been recorded.
return;
}
assert(!Thread::current()->is_VM_thread(), "must be");
Arguments::assert_is_dumping_archive();
DumpTimeClassInfo* info = find_or_allocate_info_for(klass);
if (info != NULL) {
info->record_linking_constraint(name, loader1, loader2);
}
}
// returns true IFF there's no need to re-initialize the i/v-tables for klass for
// the purpose of checking class loader constraints.
bool SystemDictionaryShared::check_linking_constraints(Thread* current, InstanceKlass* klass) {
assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only");
LogTarget(Info, class, loader, constraints) log;
if (klass->is_shared_boot_class()) {
// No class loader constraint check performed for boot classes.
return true;
}
if (klass->is_shared_platform_class() || klass->is_shared_app_class()) {
RunTimeClassInfo* info = RunTimeClassInfo::get_for(klass);
assert(info != NULL, "Sanity");
if (info->_num_loader_constraints > 0) {
HandleMark hm(current);
for (int i = 0; i < info->_num_loader_constraints; i++) {
RunTimeClassInfo::RTLoaderConstraint* lc = info->loader_constraint_at(i);
Symbol* name = lc->constraint_name();
Handle loader1(current, get_class_loader_by(lc->_loader_type1));
Handle loader2(current, get_class_loader_by(lc->_loader_type2));
if (log.is_enabled()) {
ResourceMark rm(current);
log.print("[CDS add loader constraint for class %s symbol %s loader[0] %s loader[1] %s",
klass->external_name(), name->as_C_string(),
ClassLoaderData::class_loader_data(loader1())->loader_name_and_id(),
ClassLoaderData::class_loader_data(loader2())->loader_name_and_id());
}
if (!SystemDictionary::add_loader_constraint(name, klass, loader1, loader2)) {
// Loader constraint violation has been found. The caller
// will re-layout the vtable/itables to produce the correct
// exception.
if (log.is_enabled()) {
log.print(" failed]");
}
return false;
}
if (log.is_enabled()) {
log.print(" succeeded]");
}
}
return true; // for all recorded constraints added successully.
}
}
if (log.is_enabled()) {
ResourceMark rm(current);
log.print("[CDS has not recorded loader constraint for class %s]", klass->external_name());
}
return false;
}
bool SystemDictionaryShared::is_supported_invokedynamic(BootstrapInfo* bsi) {
LogTarget(Debug, cds, lambda) log;
if (bsi->arg_values() == NULL || !bsi->arg_values()->is_objArray()) {
if (log.is_enabled()) {
LogStream log_stream(log);
log.print("bsi check failed");
log.print(" bsi->arg_values().not_null() %d", bsi->arg_values().not_null());
if (bsi->arg_values().not_null()) {
log.print(" bsi->arg_values()->is_objArray() %d", bsi->arg_values()->is_objArray());
bsi->print_msg_on(&log_stream);
}
}
return false;
}
Handle bsm = bsi->bsm();
if (bsm.is_null() || !java_lang_invoke_DirectMethodHandle::is_instance(bsm())) {
if (log.is_enabled()) {
log.print("bsm check failed");
log.print(" bsm.is_null() %d", bsm.is_null());
log.print(" java_lang_invoke_DirectMethodHandle::is_instance(bsm()) %d",
java_lang_invoke_DirectMethodHandle::is_instance(bsm()));
}
return false;
}
oop mn = java_lang_invoke_DirectMethodHandle::member(bsm());
Method* method = java_lang_invoke_MemberName::vmtarget(mn);
if (method->klass_name()->equals("java/lang/invoke/LambdaMetafactory") &&
method->name()->equals("metafactory") &&
method->signature()->equals("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;")) {
return true;
} else {
if (log.is_enabled()) {
ResourceMark rm;
log.print("method check failed");
log.print(" klass_name() %s", method->klass_name()->as_C_string());
log.print(" name() %s", method->name()->as_C_string());
log.print(" signature() %s", method->signature()->as_C_string());
}
}
return false;
}
class EstimateSizeForArchive : StackObj {
size_t _shared_class_info_size;
int _num_builtin_klasses;
int _num_unregistered_klasses;
public:
EstimateSizeForArchive() {
_shared_class_info_size = 0;
_num_builtin_klasses = 0;
_num_unregistered_klasses = 0;
}
bool do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
if (!info.is_excluded()) {
size_t byte_size = RunTimeClassInfo::byte_size(info._klass, info.num_verifier_constraints(), info.num_loader_constraints());
_shared_class_info_size += align_up(byte_size, SharedSpaceObjectAlignment);
}
return true; // keep on iterating
}
size_t total() {
return _shared_class_info_size;
}
};
size_t SystemDictionaryShared::estimate_size_for_archive() {
EstimateSizeForArchive est;
_dumptime_table->iterate(&est);
size_t total_size = est.total() +
CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) +
CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false));
if (_dumptime_lambda_proxy_class_dictionary != NULL) {
size_t bytesize = align_up(sizeof(RunTimeLambdaProxyClassInfo), SharedSpaceObjectAlignment);
total_size +=
(bytesize * _dumptime_lambda_proxy_class_dictionary->_count) +
CompactHashtableWriter::estimate_size(_dumptime_lambda_proxy_class_dictionary->_count);
} else {
total_size += CompactHashtableWriter::estimate_size(0);
}
return total_size;
}
unsigned int SystemDictionaryShared::hash_for_shared_dictionary(address ptr) {
if (ArchiveBuilder::is_active()) {
uintx offset = ArchiveBuilder::current()->any_to_offset(ptr);
unsigned int hash = primitive_hash<uintx>(offset);
DEBUG_ONLY({
if (MetaspaceObj::is_shared((const MetaspaceObj*)ptr)) {
assert(hash == SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr), "must be");
}
});
return hash;
} else {
return SystemDictionaryShared::hash_for_shared_dictionary_quick(ptr);
}
}
class CopyLambdaProxyClassInfoToArchive : StackObj {
CompactHashtableWriter* _writer;
ArchiveBuilder* _builder;
public:
CopyLambdaProxyClassInfoToArchive(CompactHashtableWriter* writer)
: _writer(writer), _builder(ArchiveBuilder::current()) {}
bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
// In static dump, info._proxy_klasses->at(0) is already relocated to point to the archived class
// (not the original class).
//
// The following check has been moved to SystemDictionaryShared::check_excluded_classes(), which
// happens before the classes are copied.
//
// if (SystemDictionaryShared::is_excluded_class(info._proxy_klasses->at(0))) {
// return true;
//}
ResourceMark rm;
log_info(cds,dynamic)("Archiving hidden %s", info._proxy_klasses->at(0)->external_name());
size_t byte_size = sizeof(RunTimeLambdaProxyClassInfo);
RunTimeLambdaProxyClassInfo* runtime_info =
(RunTimeLambdaProxyClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
runtime_info->init(key, info);
unsigned int hash = runtime_info->hash();
u4 delta = _builder->any_to_offset_u4((void*)runtime_info);
_writer->add(hash, delta);
return true;
}
};
class AdjustLambdaProxyClassInfo : StackObj {
public:
AdjustLambdaProxyClassInfo() {}
bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
int len = info._proxy_klasses->length();
if (len > 1) {
for (int i = 0; i < len-1; i++) {
InstanceKlass* ok0 = info._proxy_klasses->at(i+0); // this is original klass
InstanceKlass* ok1 = info._proxy_klasses->at(i+1); // this is original klass
assert(ArchiveBuilder::current()->is_in_buffer_space(ok0), "must be");
assert(ArchiveBuilder::current()->is_in_buffer_space(ok1), "must be");
InstanceKlass* bk0 = ok0;
InstanceKlass* bk1 = ok1;
assert(bk0->next_link() == 0, "must be called after Klass::remove_unshareable_info()");
assert(bk1->next_link() == 0, "must be called after Klass::remove_unshareable_info()");
bk0->set_next_link(bk1);
bk1->set_lambda_proxy_is_available();
ArchivePtrMarker::mark_pointer(bk0->next_link_addr());
}
}
info._proxy_klasses->at(0)->set_lambda_proxy_is_available();
return true;
}
};
class CopySharedClassInfoToArchive : StackObj {
CompactHashtableWriter* _writer;
bool _is_builtin;
ArchiveBuilder *_builder;
public:
CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
bool is_builtin)
: _writer(writer), _is_builtin(is_builtin), _builder(ArchiveBuilder::current()) {}
bool do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
size_t byte_size = RunTimeClassInfo::byte_size(info._klass, info.num_verifier_constraints(), info.num_loader_constraints());
RunTimeClassInfo* record;
record = (RunTimeClassInfo*)ArchiveBuilder::ro_region_alloc(byte_size);
record->init(info);
unsigned int hash;
Symbol* name = info._klass->name();
hash = SystemDictionaryShared::hash_for_shared_dictionary((address)name);
u4 delta = _builder->buffer_to_offset_u4((address)record);
if (_is_builtin && info._klass->is_hidden()) {
// skip
} else {
_writer->add(hash, delta);
}
if (log_is_enabled(Trace, cds, hashtables)) {
ResourceMark rm;
log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
}
// Save this for quick runtime lookup of InstanceKlass* -> RunTimeClassInfo*
RunTimeClassInfo::set_for(info._klass, record);
}
return true; // keep on iterating
}
};
void SystemDictionaryShared::write_lambda_proxy_class_dictionary(LambdaProxyClassDictionary *dictionary) {
CompactHashtableStats stats;
dictionary->reset();
CompactHashtableWriter writer(_dumptime_lambda_proxy_class_dictionary->_count, &stats);
CopyLambdaProxyClassInfoToArchive copy(&writer);
_dumptime_lambda_proxy_class_dictionary->iterate(&copy);
writer.dump(dictionary, "lambda proxy class dictionary");
}
void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
bool is_builtin) {
CompactHashtableStats stats;
dictionary->reset();
CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
CopySharedClassInfoToArchive copy(&writer, is_builtin);
assert_lock_strong(DumpTimeTable_lock);
_dumptime_table->iterate(&copy);
writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
}
void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
if (is_static_archive) {
write_dictionary(&_builtin_dictionary, true);
write_dictionary(&_unregistered_dictionary, false);
} else {
write_dictionary(&_dynamic_builtin_dictionary, true);
write_dictionary(&_dynamic_unregistered_dictionary, false);
}
if (_dumptime_lambda_proxy_class_dictionary != NULL) {
write_lambda_proxy_class_dictionary(&_lambda_proxy_class_dictionary);
}
}
void SystemDictionaryShared::adjust_lambda_proxy_class_dictionary() {
if (_dumptime_lambda_proxy_class_dictionary != NULL) {
AdjustLambdaProxyClassInfo adjuster;
_dumptime_lambda_proxy_class_dictionary->iterate(&adjuster);
}
}
void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
bool is_static_archive) {
FileMapInfo *dynamic_mapinfo = FileMapInfo::dynamic_info();
if (is_static_archive) {
_builtin_dictionary.serialize_header(soc);
_unregistered_dictionary.serialize_header(soc);
if (dynamic_mapinfo == NULL || DynamicDumpSharedSpaces || (dynamic_mapinfo != NULL && UseSharedSpaces)) {
_lambda_proxy_class_dictionary.serialize_header(soc);
}
} else {
_dynamic_builtin_dictionary.serialize_header(soc);
_dynamic_unregistered_dictionary.serialize_header(soc);
if (DynamicDumpSharedSpaces) {
_lambda_proxy_class_dictionary.serialize_header(soc);
} else {
_dynamic_lambda_proxy_class_dictionary.serialize_header(soc);
}
}
}
void SystemDictionaryShared::serialize_vm_classes(SerializeClosure* soc) {
for (auto id : EnumRange<vmClassID>{}) {
soc->do_ptr((void**)vmClasses::klass_addr_at(id));
}
}
const RunTimeClassInfo*
SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
if (!UseSharedSpaces || !name->is_shared()) {
// The names of all shared classes must also be a shared Symbol.
return NULL;
}
unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary_quick(name);
const RunTimeClassInfo* record = NULL;
if (DynamicArchive::is_mapped()) {
// Those regenerated holder classes are in dynamic archive
if (name == vmSymbols::java_lang_invoke_Invokers_Holder() ||
name == vmSymbols::java_lang_invoke_DirectMethodHandle_Holder() ||
name == vmSymbols::java_lang_invoke_LambdaForm_Holder() ||
name == vmSymbols::java_lang_invoke_DelegatingMethodHandle_Holder()) {
record = dynamic_dict->lookup(name, hash, 0);
if (record != nullptr) {
return record;
}
}
}
if (!MetaspaceShared::is_shared_dynamic(name)) {
// The names of all shared classes in the static dict must also be in the
// static archive
record = static_dict->lookup(name, hash, 0);
}
if (record == NULL && DynamicArchive::is_mapped()) {
record = dynamic_dict->lookup(name, hash, 0);
}
return record;
}
InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
const RunTimeClassInfo* record = find_record(&_builtin_dictionary, &_dynamic_builtin_dictionary, name);
if (record != NULL) {
assert(!record->_klass->is_hidden(), "hidden class cannot be looked up by name");
assert(check_alignment(record->_klass), "Address not aligned");
return record->_klass;
} else {
return NULL;
}
}
void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
assert(DumpSharedSpaces, "supported only when dumping");
DumpTimeClassInfo* info = find_or_allocate_info_for(k);
info->_id = id;
}
const char* class_loader_name_for_shared(Klass* k) {
assert(k != nullptr, "Sanity");
assert(k->is_shared(), "Must be");
assert(k->is_instance_klass(), "Must be");
InstanceKlass* ik = InstanceKlass::cast(k);
if (ik->is_shared_boot_class()) {
return "boot_loader";
} else if (ik->is_shared_platform_class()) {
return "platform_loader";
} else if (ik->is_shared_app_class()) {
return "app_loader";
} else if (ik->is_shared_unregistered_class()) {
return "unregistered_loader";
} else {
return "unknown loader";
}
}
class SharedDictionaryPrinter : StackObj {
outputStream* _st;
int _index;
public:
SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
void do_value(const RunTimeClassInfo* record) {
ResourceMark rm;
_st->print_cr("%4d: %s %s", _index++, record->_klass->external_name(),
class_loader_name_for_shared(record->_klass));
}
int index() const { return _index; }
};
class SharedLambdaDictionaryPrinter : StackObj {
outputStream* _st;
int _index;
public:
SharedLambdaDictionaryPrinter(outputStream* st, int idx) : _st(st), _index(idx) {}
void do_value(const RunTimeLambdaProxyClassInfo* record) {
if (record->proxy_klass_head()->lambda_proxy_is_available()) {
ResourceMark rm;
Klass* k = record->proxy_klass_head();
while (k != nullptr) {
_st->print_cr("%4d: %s %s", _index++, k->external_name(),
class_loader_name_for_shared(k));
k = k->next_link();
}
}
}
};
void SystemDictionaryShared::print_on(const char* prefix,
RunTimeSharedDictionary* builtin_dictionary,
RunTimeSharedDictionary* unregistered_dictionary,
LambdaProxyClassDictionary* lambda_dictionary,
outputStream* st) {
st->print_cr("%sShared Dictionary", prefix);
SharedDictionaryPrinter p(st);
st->print_cr("%sShared Builtin Dictionary", prefix);
builtin_dictionary->iterate(&p);
st->print_cr("%sShared Unregistered Dictionary", prefix);
unregistered_dictionary->iterate(&p);
if (!lambda_dictionary->empty()) {
st->print_cr("%sShared Lambda Dictionary", prefix);
SharedLambdaDictionaryPrinter ldp(st, p.index());
lambda_dictionary->iterate(&ldp);
}
}
void SystemDictionaryShared::print_shared_archive(outputStream* st, bool is_static) {
if (UseSharedSpaces) {
if (is_static) {
print_on("", &_builtin_dictionary, &_unregistered_dictionary, &_lambda_proxy_class_dictionary, st);
} else {
if (DynamicArchive::is_mapped()) {
print_on("", &_dynamic_builtin_dictionary, &_dynamic_unregistered_dictionary,
&_dynamic_lambda_proxy_class_dictionary, st);
}
}
}
}
void SystemDictionaryShared::print_on(outputStream* st) {
if (UseSharedSpaces) {
print_on("", &_builtin_dictionary, &_unregistered_dictionary, &_lambda_proxy_class_dictionary, st);
if (DynamicArchive::is_mapped()) {
print_on("", &_dynamic_builtin_dictionary, &_dynamic_unregistered_dictionary,
&_dynamic_lambda_proxy_class_dictionary, st);
}
}
}
void SystemDictionaryShared::print_table_statistics(outputStream* st) {
if (UseSharedSpaces) {
_builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
_unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
_lambda_proxy_class_dictionary.print_table_statistics(st, "Lambda Shared Dictionary");
if (DynamicArchive::is_mapped()) {
_dynamic_builtin_dictionary.print_table_statistics(st, "Dynamic Builtin Shared Dictionary");
_dynamic_unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
_dynamic_lambda_proxy_class_dictionary.print_table_statistics(st, "Dynamic Lambda Shared Dictionary");
}
}
}
bool SystemDictionaryShared::is_dumptime_table_empty() {
if (_dumptime_table == NULL) {
return true;
}
_dumptime_table->update_counts();
if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
return true;
}
return false;
}
class CloneDumpTimeClassTable: public StackObj {
DumpTimeSharedClassTable* _table;
DumpTimeSharedClassTable* _cloned_table;
public:
CloneDumpTimeClassTable(DumpTimeSharedClassTable* table, DumpTimeSharedClassTable* clone) :
_table(table), _cloned_table(clone) {
assert(_table != NULL, "_dumptime_table is NULL");
assert(_cloned_table != NULL, "_cloned_table is NULL");
}
bool do_entry(InstanceKlass* k, DumpTimeClassInfo& info) {
if (!info.is_excluded()) {
bool created;
_cloned_table->put_if_absent(k, info.clone(), &created);
}
return true; // keep on iterating
}
};
class CloneDumpTimeLambdaProxyClassTable: StackObj {
DumpTimeLambdaProxyClassDictionary* _table;
DumpTimeLambdaProxyClassDictionary* _cloned_table;
public:
CloneDumpTimeLambdaProxyClassTable(DumpTimeLambdaProxyClassDictionary* table,
DumpTimeLambdaProxyClassDictionary* clone) :
_table(table), _cloned_table(clone) {
assert(_table != NULL, "_dumptime_table is NULL");
assert(_cloned_table != NULL, "_cloned_table is NULL");
}
bool do_entry(LambdaProxyClassKey& key, DumpTimeLambdaProxyClassInfo& info) {
assert_lock_strong(DumpTimeTable_lock);
bool created;
// make copies then store in _clone_table
LambdaProxyClassKey keyCopy = key;
_cloned_table->put_if_absent(keyCopy, info.clone(), &created);
++ _cloned_table->_count;
return true; // keep on iterating
}
};
void SystemDictionaryShared::clone_dumptime_tables() {
Arguments::assert_is_dumping_archive();
assert_lock_strong(DumpTimeTable_lock);
if (_dumptime_table != NULL) {
assert(_cloned_dumptime_table == NULL, "_cloned_dumptime_table must be cleaned");
_cloned_dumptime_table = new (ResourceObj::C_HEAP, mtClass) DumpTimeSharedClassTable;
CloneDumpTimeClassTable copy_classes(_dumptime_table, _cloned_dumptime_table);
_dumptime_table->iterate(&copy_classes);
_cloned_dumptime_table->update_counts();
}
if (_dumptime_lambda_proxy_class_dictionary != NULL) {
assert(_cloned_dumptime_lambda_proxy_class_dictionary == NULL,
"_cloned_dumptime_lambda_proxy_class_dictionary must be cleaned");
_cloned_dumptime_lambda_proxy_class_dictionary =
new (ResourceObj::C_HEAP, mtClass) DumpTimeLambdaProxyClassDictionary;
CloneDumpTimeLambdaProxyClassTable copy_proxy_classes(_dumptime_lambda_proxy_class_dictionary,
_cloned_dumptime_lambda_proxy_class_dictionary);
_dumptime_lambda_proxy_class_dictionary->iterate(&copy_proxy_classes);
}
}
void SystemDictionaryShared::restore_dumptime_tables() {
assert_lock_strong(DumpTimeTable_lock);
delete _dumptime_table;
_dumptime_table = _cloned_dumptime_table;
_cloned_dumptime_table = NULL;
delete _dumptime_lambda_proxy_class_dictionary;
_dumptime_lambda_proxy_class_dictionary = _cloned_dumptime_lambda_proxy_class_dictionary;
_cloned_dumptime_lambda_proxy_class_dictionary = NULL;
}
#if INCLUDE_CDS_JAVA_HEAP
class ArchivedMirrorPatcher {
protected:
static void update(Klass* k) {
if (k->has_archived_mirror_index()) {
oop m = k->archived_java_mirror();
if (m != NULL) {
java_lang_Class::update_archived_mirror_native_pointers(m);
}
}
}
public:
static void update_array_klasses(Klass* ak) {
while (ak != NULL) {
update(ak);
ak = ArrayKlass::cast(ak)->higher_dimension();
}
}
void do_value(const RunTimeClassInfo* info) {
InstanceKlass* ik = info->_klass;
update(ik);
update_array_klasses(ik->array_klasses());
}
};
class ArchivedLambdaMirrorPatcher : public ArchivedMirrorPatcher {
public:
void do_value(const RunTimeLambdaProxyClassInfo* info) {
InstanceKlass* ik = info->proxy_klass_head();
while (ik != NULL) {
update(ik);
Klass* k = ik->next_link();
ik = (k != NULL) ? InstanceKlass::cast(k) : NULL;
}
}
};
void SystemDictionaryShared::update_archived_mirror_native_pointers_for(RunTimeSharedDictionary* dict) {
ArchivedMirrorPatcher patcher;
dict->iterate(&patcher);
}
void SystemDictionaryShared::update_archived_mirror_native_pointers_for(LambdaProxyClassDictionary* dict) {
ArchivedLambdaMirrorPatcher patcher;
dict->iterate(&patcher);
}
void SystemDictionaryShared::update_archived_mirror_native_pointers() {
if (!HeapShared::open_archive_heap_region_mapped()) {
return;
}
if (MetaspaceShared::relocation_delta() == 0) {
return;
}
update_archived_mirror_native_pointers_for(&_builtin_dictionary);
update_archived_mirror_native_pointers_for(&_unregistered_dictionary);
update_archived_mirror_native_pointers_for(&_lambda_proxy_class_dictionary);
for (int t = T_BOOLEAN; t <= T_LONG; t++) {
Klass* k = Universe::typeArrayKlassObj((BasicType)t);
ArchivedMirrorPatcher::update_array_klasses(k);
}
}
#endif
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