| /* |
| * Copyright (c) 2017, 2018, 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 "gc/shared/preservedMarks.inline.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "unittest.hpp" |
| |
| class ScopedDisabledBiasedLocking { |
| bool _orig; |
| public: |
| ScopedDisabledBiasedLocking() : _orig(UseBiasedLocking) { UseBiasedLocking = false; } |
| ~ScopedDisabledBiasedLocking() { UseBiasedLocking = _orig; } |
| }; |
| |
| // Class to create a "fake" oop with a mark that will |
| // return true for calls to must_be_preserved(). |
| class FakeOop { |
| oopDesc _oop; |
| |
| public: |
| FakeOop() : _oop() { _oop.set_mark_raw(originalMark()); } |
| |
| oop get_oop() { return &_oop; } |
| markOop mark() { return _oop.mark_raw(); } |
| void set_mark(markOop m) { _oop.set_mark_raw(m); } |
| void forward_to(oop obj) { |
| markOop m = markOop::encode_pointer_as_mark(obj); |
| _oop.set_mark_raw(m); |
| } |
| |
| static markOop originalMark() { return markOop(markOop::lock_mask_in_place); } |
| static markOop changedMark() { return markOop(0x4711); } |
| }; |
| |
| TEST_VM(PreservedMarks, iterate_and_restore) { |
| // Need to disable biased locking to easily |
| // create oops that "must_be_preseved" |
| ScopedDisabledBiasedLocking dbl; |
| |
| PreservedMarks pm; |
| FakeOop o1; |
| FakeOop o2; |
| FakeOop o3; |
| FakeOop o4; |
| |
| // Make sure initial marks are correct. |
| ASSERT_EQ(o1.mark(), FakeOop::originalMark()); |
| ASSERT_EQ(o2.mark(), FakeOop::originalMark()); |
| ASSERT_EQ(o3.mark(), FakeOop::originalMark()); |
| ASSERT_EQ(o4.mark(), FakeOop::originalMark()); |
| |
| // Change the marks and verify change. |
| o1.set_mark(FakeOop::changedMark()); |
| o2.set_mark(FakeOop::changedMark()); |
| ASSERT_EQ(o1.mark(), FakeOop::changedMark()); |
| ASSERT_EQ(o2.mark(), FakeOop::changedMark()); |
| |
| // Push o1 and o2 to have their marks preserved. |
| pm.push(o1.get_oop(), o1.mark()); |
| pm.push(o2.get_oop(), o2.mark()); |
| |
| // Fake a move from o1->o3 and o2->o4. |
| o1.forward_to(o3.get_oop()); |
| o2.forward_to(o4.get_oop()); |
| ASSERT_EQ(o1.get_oop()->forwardee(), o3.get_oop()); |
| ASSERT_EQ(o2.get_oop()->forwardee(), o4.get_oop()); |
| // Adjust will update the PreservedMarks stack to |
| // make sure the mark is updated at the new location. |
| pm.adjust_during_full_gc(); |
| |
| // Restore all preserved and verify that the changed |
| // mark is now present at o3 and o4. |
| pm.restore(); |
| ASSERT_EQ(o3.mark(), FakeOop::changedMark()); |
| ASSERT_EQ(o4.mark(), FakeOop::changedMark()); |
| } |