151 lines
4.9 KiB
C++
151 lines
4.9 KiB
C++
/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "precompiled.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "memory/resourceArea.hpp"
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#include "memory/universe.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/biasedLocking.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/orderAccess.hpp"
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#include "runtime/os.hpp"
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#include "runtime/synchronizer.hpp"
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#include "runtime/semaphore.inline.hpp"
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#include "threadHelper.inline.hpp"
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#include "unittest.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/ostream.hpp"
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// The test doesn't work for PRODUCT because it needs WizardMode
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#ifndef PRODUCT
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static bool test_pattern(stringStream* st, const char* pattern) {
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return (strstr(st->as_string(), pattern) != NULL);
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}
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static void assert_test_pattern(Handle object, const char* pattern) {
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stringStream st;
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object->print_on(&st);
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ASSERT_TRUE(test_pattern(&st, pattern)) << pattern << " not in " << st.as_string();
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}
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static void assert_not_test_pattern(Handle object, const char* pattern) {
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stringStream st;
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object->print_on(&st);
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ASSERT_FALSE(test_pattern(&st, pattern)) << pattern << " found in " << st.as_string();
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}
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class LockerThread : public JavaTestThread {
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oop _obj;
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public:
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LockerThread(Semaphore* post, oop obj) : JavaTestThread(post), _obj(obj) {}
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virtual ~LockerThread() {}
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void main_run() {
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Thread* THREAD = Thread::current();
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HandleMark hm(THREAD);
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Handle h_obj(THREAD, _obj);
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ResourceMark rm(THREAD);
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// Wait gets the lock inflated.
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// The object will stay locked for the context of 'ol' so the lock will
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// still be inflated after the notify_all() call. Deflation can't happen
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// while an ObjectMonitor is "busy" and being locked is the most "busy"
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// state we have...
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ObjectLocker ol(h_obj, THREAD);
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ol.notify_all(THREAD);
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assert_test_pattern(h_obj, "monitor");
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}
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};
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TEST_VM(markWord, printing) {
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JavaThread* THREAD = JavaThread::current();
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ThreadInVMfromNative invm(THREAD);
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ResourceMark rm(THREAD);
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if (!UseBiasedLocking || !BiasedLocking::enabled()) {
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// Can't test this with biased locking disabled.
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return;
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}
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oop obj = SystemDictionary::Byte_klass()->allocate_instance(THREAD);
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FlagSetting fs(WizardMode, true);
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HandleMark hm(THREAD);
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Handle h_obj(THREAD, obj);
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// Biased locking is initially enabled for this java.lang.Byte object.
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assert_test_pattern(h_obj, "is_biased");
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// Lock using biased locking.
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BasicObjectLock lock;
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lock.set_obj(obj);
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markWord prototype_header = obj->klass()->prototype_header();
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markWord mark = obj->mark();
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markWord biased_mark = markWord::encode((JavaThread*) THREAD, mark.age(), prototype_header.bias_epoch());
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obj->set_mark(biased_mark);
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// Look for the biased_locker in markWord, not prototype_header.
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#ifdef _LP64
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assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x0000000000000000");
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#else
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assert_not_test_pattern(h_obj, "mark(is_biased biased_locker=0x00000000");
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#endif
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// Same thread tries to lock it again.
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{
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ObjectLocker ol(h_obj, THREAD);
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assert_test_pattern(h_obj, "locked");
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}
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// This is no longer biased, because ObjectLocker revokes the bias.
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assert_test_pattern(h_obj, "is_neutral no_hash");
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// Wait gets the lock inflated.
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{
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ObjectLocker ol(h_obj, THREAD);
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Semaphore done(0);
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LockerThread* st;
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st = new LockerThread(&done, h_obj());
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st->doit();
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ol.wait(THREAD);
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assert_test_pattern(h_obj, "monitor");
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done.wait_with_safepoint_check(THREAD); // wait till the thread is done.
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}
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// Make the object older. Not all GCs use this field.
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Universe::heap()->collect(GCCause::_java_lang_system_gc);
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if (UseParallelGC) {
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assert_test_pattern(h_obj, "is_neutral no_hash age 1");
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}
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// Hash the object then print it.
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intx hash = h_obj->identity_hash();
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assert_test_pattern(h_obj, "is_neutral hash=0x");
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}
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#endif // PRODUCT
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