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8283710: JVMTI: Use BitSet for object marking

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Reviewed-by: stuefe, coleenp
This commit is contained in:
Roman Kennke 2022-04-11 14:50:29 +00:00
parent 7edd186121
commit abfd2f98dc
10 changed files with 194 additions and 229 deletions
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66
test/hotspot/gtest/utilities/test_objectBitSet.cpp Normal file
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/*
* Copyright (c) 2022, 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 "memory/allocation.hpp"
#include "utilities/objectBitSet.inline.hpp"
#include "unittest.hpp"
TEST_VM(ObjectBitSet, empty) {
ObjectBitSet<mtTracing> obs;
oopDesc obj1;
ASSERT_FALSE(obs.is_marked(&obj1));
}
// NOTE: This is a little weird. NULL is not treated any special: ObjectBitSet will happily
// allocate a fragement for the memory range starting at 0 and mark the first bit when passing NULL.
// In the absense of any error handling, I am not sure what would possibly be a reasonable better
// way to do it, though.
TEST_VM(ObjectBitSet, null) {
ObjectBitSet<mtTracing> obs;
ASSERT_FALSE(obs.is_marked((oop)NULL));
obs.mark_obj((oop) NULL);
ASSERT_TRUE(obs.is_marked((oop)NULL));
}
TEST_VM(ObjectBitSet, mark_single) {
ObjectBitSet<mtTracing> obs;
oopDesc obj1;
ASSERT_FALSE(obs.is_marked(&obj1));
obs.mark_obj(&obj1);
ASSERT_TRUE(obs.is_marked(&obj1));
}
TEST_VM(ObjectBitSet, mark_multi) {
ObjectBitSet<mtTracing> obs;
oopDesc obj1;
oopDesc obj2;
ASSERT_FALSE(obs.is_marked(&obj1));
ASSERT_FALSE(obs.is_marked(&obj2));
obs.mark_obj(&obj1);
ASSERT_TRUE(obs.is_marked(&obj1));
ASSERT_FALSE(obs.is_marked(&obj2));
obs.mark_obj(&obj2);
ASSERT_TRUE(obs.is_marked(&obj1));
ASSERT_TRUE(obs.is_marked(&obj2));
}