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/*
* Copyright (c) 2012, 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 "services/memPtr.hpp"
#include "services/memTracker.hpp"
volatile jint SequenceGenerator::_seq_number = 1;
NOT_PRODUCT(jint SequenceGenerator::_max_seq_number = 1;)
DEBUG_ONLY(volatile unsigned long SequenceGenerator::_generation = 0;)
jint SequenceGenerator::next() {
jint seq = Atomic::add(1, &_seq_number);
if (seq < 0) {
MemTracker::shutdown(MemTracker::NMT_sequence_overflow);
}
assert(seq > 0, "counter overflow");
NOT_PRODUCT(_max_seq_number = (seq > _max_seq_number) ? seq : _max_seq_number;)
return seq;
}
bool VMMemRegion::contains(const VMMemRegion* mr) const {
assert(base() != 0, "Sanity check");
assert(size() != 0 || committed_size() != 0,
"Sanity check");
address base_addr = base();
address end_addr = base_addr +
(is_reserve_record()? reserved_size(): committed_size());
if (mr->is_reserve_record()) {
if (mr->base() == base_addr && mr->size() == size()) {
// the same range
return true;
}
return false;
} else if (mr->is_commit_record() || mr->is_uncommit_record()) {
assert(mr->base() != 0 && mr->committed_size() > 0,
"bad record");
return (mr->base() >= base_addr &&
(mr->base() + mr->committed_size()) <= end_addr);
} else if (mr->is_type_tagging_record()) {
assert(mr->base() != NULL, "Sanity check");
return (mr->base() >= base_addr && mr->base() < end_addr);
} else if (mr->is_release_record()) {
assert(mr->base() != 0 && mr->size() > 0,
"bad record");
return (mr->base() == base_addr && mr->size() == size());
} else {
ShouldNotReachHere();
return false;
}
}
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