100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
/*
|
|
* 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; }
|
|
markWord mark() { return _oop.mark_raw(); }
|
|
void set_mark(markWord m) { _oop.set_mark_raw(m); }
|
|
void forward_to(oop obj) {
|
|
markWord m = markWord::encode_pointer_as_mark(obj);
|
|
_oop.set_mark_raw(m);
|
|
}
|
|
|
|
static markWord originalMark() { return markWord(markWord::lock_mask_in_place); }
|
|
static markWord changedMark() { return markWord(0x4711); }
|
|
};
|
|
|
|
#define ASSERT_MARK_WORD_EQ(a, b) ASSERT_EQ((a).value(), (b).value())
|
|
|
|
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_MARK_WORD_EQ(o1.mark(), FakeOop::originalMark());
|
|
ASSERT_MARK_WORD_EQ(o2.mark(), FakeOop::originalMark());
|
|
ASSERT_MARK_WORD_EQ(o3.mark(), FakeOop::originalMark());
|
|
ASSERT_MARK_WORD_EQ(o4.mark(), FakeOop::originalMark());
|
|
|
|
// Change the marks and verify change.
|
|
o1.set_mark(FakeOop::changedMark());
|
|
o2.set_mark(FakeOop::changedMark());
|
|
ASSERT_MARK_WORD_EQ(o1.mark(), FakeOop::changedMark());
|
|
ASSERT_MARK_WORD_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_MARK_WORD_EQ(o3.mark(), FakeOop::changedMark());
|
|
ASSERT_MARK_WORD_EQ(o4.mark(), FakeOop::changedMark());
|
|
}
|