--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/dictionary.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,516 @@
+/*
+ * Copyright (c) 2003, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/classLoaderData.inline.hpp"
+#include "classfile/sharedClassUtil.hpp"
+#include "classfile/dictionary.hpp"
+#include "classfile/protectionDomainCache.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "classfile/systemDictionaryShared.hpp"
+#include "logging/log.hpp"
+#include "logging/logStream.hpp"
+#include "memory/iterator.hpp"
+#include "memory/metaspaceClosure.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/oop.inline.hpp"
+#include "runtime/atomic.hpp"
+#include "runtime/orderAccess.inline.hpp"
+#include "utilities/hashtable.inline.hpp"
+
+size_t Dictionary::entry_size() {
+ if (DumpSharedSpaces) {
+ return SystemDictionaryShared::dictionary_entry_size();
+ } else {
+ return sizeof(DictionaryEntry);
+ }
+}
+
+Dictionary::Dictionary(ClassLoaderData* loader_data, int table_size)
+ : _loader_data(loader_data), Hashtable<InstanceKlass*, mtClass>(table_size, (int)entry_size()) {
+};
+
+
+Dictionary::Dictionary(ClassLoaderData* loader_data,
+ int table_size, HashtableBucket<mtClass>* t,
+ int number_of_entries)
+ : _loader_data(loader_data), Hashtable<InstanceKlass*, mtClass>(table_size, (int)entry_size(), t, number_of_entries) {
+};
+
+Dictionary::~Dictionary() {
+ DictionaryEntry* probe = NULL;
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {
+ probe = *p;
+ *p = probe->next();
+ free_entry(probe);
+ }
+ }
+ assert(number_of_entries() == 0, "should have removed all entries");
+ assert(new_entry_free_list() == NULL, "entry present on Dictionary's free list");
+ free_buckets();
+}
+
+DictionaryEntry* Dictionary::new_entry(unsigned int hash, InstanceKlass* klass) {
+ DictionaryEntry* entry = (DictionaryEntry*)Hashtable<InstanceKlass*, mtClass>::allocate_new_entry(hash, klass);
+ entry->set_pd_set(NULL);
+ assert(klass->is_instance_klass(), "Must be");
+ if (DumpSharedSpaces) {
+ SystemDictionaryShared::init_shared_dictionary_entry(klass, entry);
+ }
+ return entry;
+}
+
+
+void Dictionary::free_entry(DictionaryEntry* entry) {
+ // avoid recursion when deleting linked list
+ // pd_set is accessed during a safepoint.
+ while (entry->pd_set() != NULL) {
+ ProtectionDomainEntry* to_delete = entry->pd_set();
+ entry->set_pd_set(to_delete->next());
+ delete to_delete;
+ }
+ // Unlink from the Hashtable prior to freeing
+ unlink_entry(entry);
+ FREE_C_HEAP_ARRAY(char, entry);
+}
+
+
+bool DictionaryEntry::contains_protection_domain(oop protection_domain) const {
+#ifdef ASSERT
+ if (protection_domain == instance_klass()->protection_domain()) {
+ // Ensure this doesn't show up in the pd_set (invariant)
+ bool in_pd_set = false;
+ for (ProtectionDomainEntry* current = pd_set_acquire();
+ current != NULL;
+ current = current->next()) {
+ if (current->protection_domain() == protection_domain) {
+ in_pd_set = true;
+ break;
+ }
+ }
+ if (in_pd_set) {
+ assert(false, "A klass's protection domain should not show up "
+ "in its sys. dict. PD set");
+ }
+ }
+#endif /* ASSERT */
+
+ if (protection_domain == instance_klass()->protection_domain()) {
+ // Succeeds trivially
+ return true;
+ }
+
+ for (ProtectionDomainEntry* current = pd_set_acquire();
+ current != NULL;
+ current = current->next()) {
+ if (current->protection_domain() == protection_domain) return true;
+ }
+ return false;
+}
+
+
+void DictionaryEntry::add_protection_domain(Dictionary* dict, Handle protection_domain) {
+ assert_locked_or_safepoint(SystemDictionary_lock);
+ if (!contains_protection_domain(protection_domain())) {
+ ProtectionDomainCacheEntry* entry = SystemDictionary::cache_get(protection_domain);
+ ProtectionDomainEntry* new_head =
+ new ProtectionDomainEntry(entry, pd_set());
+ // Warning: Preserve store ordering. The SystemDictionary is read
+ // without locks. The new ProtectionDomainEntry must be
+ // complete before other threads can be allowed to see it
+ // via a store to _pd_set.
+ release_set_pd_set(new_head);
+ }
+ LogTarget(Trace, protectiondomain) lt;
+ if (lt.is_enabled()) {
+ LogStream ls(lt);
+ print_count(&ls);
+ }
+}
+
+
+void Dictionary::do_unloading() {
+ assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint");
+
+ // The NULL class loader doesn't initiate loading classes from other class loaders
+ if (loader_data() == ClassLoaderData::the_null_class_loader_data()) {
+ return;
+ }
+
+ // Remove unloaded entries and classes from this dictionary
+ DictionaryEntry* probe = NULL;
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {
+ probe = *p;
+ InstanceKlass* ik = probe->instance_klass();
+ ClassLoaderData* k_def_class_loader_data = ik->class_loader_data();
+
+ // If the klass that this loader initiated is dead,
+ // (determined by checking the defining class loader)
+ // remove this entry.
+ if (k_def_class_loader_data->is_unloading()) {
+ assert(k_def_class_loader_data != loader_data(),
+ "cannot have live defining loader and unreachable klass");
+ *p = probe->next();
+ free_entry(probe);
+ continue;
+ }
+ p = probe->next_addr();
+ }
+ }
+}
+
+void Dictionary::remove_classes_in_error_state() {
+ assert(DumpSharedSpaces, "supported only when dumping");
+ DictionaryEntry* probe = NULL;
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {
+ probe = *p;
+ InstanceKlass* ik = probe->instance_klass();
+ if (ik->is_in_error_state()) { // purge this entry
+ *p = probe->next();
+ free_entry(probe);
+ ResourceMark rm;
+ tty->print_cr("Preload Warning: Removed error class: %s", ik->external_name());
+ continue;
+ }
+
+ p = probe->next_addr();
+ }
+ }
+}
+
+// Just the classes from defining class loaders
+void Dictionary::classes_do(void f(InstanceKlass*)) {
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry* probe = bucket(index);
+ probe != NULL;
+ probe = probe->next()) {
+ InstanceKlass* k = probe->instance_klass();
+ if (loader_data() == k->class_loader_data()) {
+ f(k);
+ }
+ }
+ }
+}
+
+// Added for initialize_itable_for_klass to handle exceptions
+// Just the classes from defining class loaders
+void Dictionary::classes_do(void f(InstanceKlass*, TRAPS), TRAPS) {
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry* probe = bucket(index);
+ probe != NULL;
+ probe = probe->next()) {
+ InstanceKlass* k = probe->instance_klass();
+ if (loader_data() == k->class_loader_data()) {
+ f(k, CHECK);
+ }
+ }
+ }
+}
+
+// All classes, and their class loaders, including initiating class loaders
+void Dictionary::all_entries_do(void f(InstanceKlass*, ClassLoaderData*)) {
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry* probe = bucket(index);
+ probe != NULL;
+ probe = probe->next()) {
+ InstanceKlass* k = probe->instance_klass();
+ f(k, loader_data());
+ }
+ }
+}
+
+// Used to scan and relocate the classes during CDS archive dump.
+void Dictionary::classes_do(MetaspaceClosure* it) {
+ assert(DumpSharedSpaces, "dump-time only");
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry* probe = bucket(index);
+ probe != NULL;
+ probe = probe->next()) {
+ it->push(probe->klass_addr());
+ ((SharedDictionaryEntry*)probe)->metaspace_pointers_do(it);
+ }
+ }
+}
+
+
+
+// Add a loaded class to the dictionary.
+// Readers of the SystemDictionary aren't always locked, so _buckets
+// is volatile. The store of the next field in the constructor is
+// also cast to volatile; we do this to ensure store order is maintained
+// by the compilers.
+
+void Dictionary::add_klass(int index, unsigned int hash, Symbol* class_name,
+ InstanceKlass* obj) {
+ assert_locked_or_safepoint(SystemDictionary_lock);
+ assert(obj != NULL, "adding NULL obj");
+ assert(obj->name() == class_name, "sanity check on name");
+
+ DictionaryEntry* entry = new_entry(hash, obj);
+ add_entry(index, entry);
+}
+
+
+// This routine does not lock the dictionary.
+//
+// Since readers don't hold a lock, we must make sure that system
+// dictionary entries are only removed at a safepoint (when only one
+// thread is running), and are added to in a safe way (all links must
+// be updated in an MT-safe manner).
+//
+// Callers should be aware that an entry could be added just after
+// _buckets[index] is read here, so the caller will not see the new entry.
+DictionaryEntry* Dictionary::get_entry(int index, unsigned int hash,
+ Symbol* class_name) {
+ for (DictionaryEntry* entry = bucket(index);
+ entry != NULL;
+ entry = entry->next()) {
+ if (entry->hash() == hash && entry->equals(class_name)) {
+ if (!DumpSharedSpaces || SystemDictionaryShared::is_builtin(entry)) {
+ return entry;
+ }
+ }
+ }
+ return NULL;
+}
+
+
+InstanceKlass* Dictionary::find(int index, unsigned int hash, Symbol* name,
+ Handle protection_domain) {
+ DictionaryEntry* entry = get_entry(index, hash, name);
+ if (entry != NULL && entry->is_valid_protection_domain(protection_domain)) {
+ return entry->instance_klass();
+ } else {
+ return NULL;
+ }
+}
+
+
+InstanceKlass* Dictionary::find_class(int index, unsigned int hash,
+ Symbol* name) {
+ assert_locked_or_safepoint(SystemDictionary_lock);
+ assert (index == index_for(name), "incorrect index?");
+
+ DictionaryEntry* entry = get_entry(index, hash, name);
+ return (entry != NULL) ? entry->instance_klass() : NULL;
+}
+
+
+// Variant of find_class for shared classes. No locking required, as
+// that table is static.
+
+InstanceKlass* Dictionary::find_shared_class(int index, unsigned int hash,
+ Symbol* name) {
+ assert (index == index_for(name), "incorrect index?");
+
+ DictionaryEntry* entry = get_entry(index, hash, name);
+ return (entry != NULL) ? entry->instance_klass() : NULL;
+}
+
+
+void Dictionary::add_protection_domain(int index, unsigned int hash,
+ InstanceKlass* klass,
+ Handle protection_domain,
+ TRAPS) {
+ Symbol* klass_name = klass->name();
+ DictionaryEntry* entry = get_entry(index, hash, klass_name);
+
+ assert(entry != NULL,"entry must be present, we just created it");
+ assert(protection_domain() != NULL,
+ "real protection domain should be present");
+
+ entry->add_protection_domain(this, protection_domain);
+
+ assert(entry->contains_protection_domain(protection_domain()),
+ "now protection domain should be present");
+}
+
+
+bool Dictionary::is_valid_protection_domain(int index, unsigned int hash,
+ Symbol* name,
+ Handle protection_domain) {
+ DictionaryEntry* entry = get_entry(index, hash, name);
+ return entry->is_valid_protection_domain(protection_domain);
+}
+
+
+void Dictionary::reorder_dictionary_for_sharing() {
+
+ // Copy all the dictionary entries into a single master list.
+
+ DictionaryEntry* master_list = NULL;
+ for (int i = 0; i < table_size(); ++i) {
+ DictionaryEntry* p = bucket(i);
+ while (p != NULL) {
+ DictionaryEntry* next = p->next();
+ InstanceKlass*ik = p->instance_klass();
+ // 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).
+ if (ik->signers() != NULL) {
+ ResourceMark rm;
+ tty->print_cr("Preload Warning: Skipping %s from signed JAR",
+ ik->name()->as_C_string());
+ free_entry(p);
+ } else {
+ p->set_next(master_list);
+ master_list = p;
+ }
+ p = next;
+ }
+ set_entry(i, NULL);
+ }
+
+ // Add the dictionary entries back to the list in the correct buckets.
+ while (master_list != NULL) {
+ DictionaryEntry* p = master_list;
+ master_list = master_list->next();
+ p->set_next(NULL);
+ Symbol* class_name = p->instance_klass()->name();
+ // Since the null class loader data isn't copied to the CDS archive,
+ // compute the hash with NULL for loader data.
+ unsigned int hash = compute_hash(class_name);
+ int index = hash_to_index(hash);
+ p->set_hash(hash);
+ p->set_next(bucket(index));
+ set_entry(index, p);
+ }
+}
+
+
+SymbolPropertyTable::SymbolPropertyTable(int table_size)
+ : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry))
+{
+}
+SymbolPropertyTable::SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t,
+ int number_of_entries)
+ : Hashtable<Symbol*, mtSymbol>(table_size, sizeof(SymbolPropertyEntry), t, number_of_entries)
+{
+}
+
+
+SymbolPropertyEntry* SymbolPropertyTable::find_entry(int index, unsigned int hash,
+ Symbol* sym,
+ intptr_t sym_mode) {
+ assert(index == index_for(sym, sym_mode), "incorrect index?");
+ for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
+ if (p->hash() == hash && p->symbol() == sym && p->symbol_mode() == sym_mode) {
+ return p;
+ }
+ }
+ return NULL;
+}
+
+
+SymbolPropertyEntry* SymbolPropertyTable::add_entry(int index, unsigned int hash,
+ Symbol* sym, intptr_t sym_mode) {
+ assert_locked_or_safepoint(SystemDictionary_lock);
+ assert(index == index_for(sym, sym_mode), "incorrect index?");
+ assert(find_entry(index, hash, sym, sym_mode) == NULL, "no double entry");
+
+ SymbolPropertyEntry* p = new_entry(hash, sym, sym_mode);
+ Hashtable<Symbol*, mtSymbol>::add_entry(index, p);
+ return p;
+}
+
+void SymbolPropertyTable::oops_do(OopClosure* f) {
+ for (int index = 0; index < table_size(); index++) {
+ for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
+ if (p->method_type() != NULL) {
+ f->do_oop(p->method_type_addr());
+ }
+ }
+ }
+}
+
+void SymbolPropertyTable::methods_do(void f(Method*)) {
+ for (int index = 0; index < table_size(); index++) {
+ for (SymbolPropertyEntry* p = bucket(index); p != NULL; p = p->next()) {
+ Method* prop = p->method();
+ if (prop != NULL) {
+ f((Method*)prop);
+ }
+ }
+ }
+}
+
+
+// ----------------------------------------------------------------------------
+
+void Dictionary::print_on(outputStream* st) const {
+ ResourceMark rm;
+
+ assert(loader_data() != NULL, "loader data should not be null");
+ st->print_cr("Java dictionary (table_size=%d, classes=%d)",
+ table_size(), number_of_entries());
+ st->print_cr("^ indicates that initiating loader is different from defining loader");
+
+ for (int index = 0; index < table_size(); index++) {
+ for (DictionaryEntry* probe = bucket(index);
+ probe != NULL;
+ probe = probe->next()) {
+ Klass* e = probe->instance_klass();
+ bool is_defining_class =
+ (loader_data() == e->class_loader_data());
+ st->print("%4d: %s%s, loader ", index, is_defining_class ? " " : "^", e->external_name());
+ ClassLoaderData* loader_data = e->class_loader_data();
+ if (loader_data == NULL) {
+ // Shared class not restored yet in shared dictionary
+ st->print("<shared, not restored>");
+ } else {
+ loader_data->print_value_on(st);
+ }
+ st->cr();
+ }
+ }
+ tty->cr();
+}
+
+void DictionaryEntry::verify() {
+ Klass* e = instance_klass();
+ guarantee(e->is_instance_klass(),
+ "Verify of dictionary failed");
+ e->verify();
+ verify_protection_domain_set();
+}
+
+void Dictionary::verify() {
+ guarantee(number_of_entries() >= 0, "Verify of dictionary failed");
+
+ ClassLoaderData* cld = loader_data();
+ // class loader must be present; a null class loader is the
+ // boostrap loader
+ guarantee(cld != NULL || DumpSharedSpaces ||
+ cld->class_loader() == NULL ||
+ cld->class_loader()->is_instance(),
+ "checking type of class_loader");
+
+ ResourceMark rm;
+ stringStream tempst;
+ tempst.print("System Dictionary for %s", cld->loader_name());
+ verify_table<DictionaryEntry>(tempst.as_string());
+}