zgu@3900: /*
zgu@3900:  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
zgu@3900:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
zgu@3900:  *
zgu@3900:  * This code is free software; you can redistribute it and/or modify it
zgu@3900:  * under the terms of the GNU General Public License version 2 only, as
zgu@3900:  * published by the Free Software Foundation.
zgu@3900:  *
zgu@3900:  * This code is distributed in the hope that it will be useful, but WITHOUT
zgu@3900:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
zgu@3900:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
zgu@3900:  * version 2 for more details (a copy is included in the LICENSE file that
zgu@3900:  * accompanied this code).
zgu@3900:  *
zgu@3900:  * You should have received a copy of the GNU General Public License version
zgu@3900:  * 2 along with this work; if not, write to the Free Software Foundation,
zgu@3900:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
zgu@3900:  *
zgu@3900:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
zgu@3900:  * or visit www.oracle.com if you need additional information or have any
zgu@3900:  * questions.
zgu@3900:  *
zgu@3900:  */
zgu@3900: 
zgu@3900: #include "precompiled.hpp"
zgu@3900: #include "services/memPtr.hpp"
zgu@3900: #include "services/memTracker.hpp"
zgu@3900: 
zgu@3900: volatile jint SequenceGenerator::_seq_number = 1;
zgu@3900: DEBUG_ONLY(jint SequenceGenerator::_max_seq_number = 1;)
zgu@3900: DEBUG_ONLY(volatile unsigned long SequenceGenerator::_generation = 0;)
zgu@3900: 
zgu@3900: jint SequenceGenerator::next() {
zgu@3900:   jint seq = Atomic::add(1, &_seq_number);
zgu@3900:   if (seq < 0) {
zgu@3900:     MemTracker::shutdown(MemTracker::NMT_sequence_overflow);
zgu@3900:   }
zgu@3900:   assert(seq > 0, "counter overflow");
zgu@3900:   DEBUG_ONLY(_max_seq_number = (seq > _max_seq_number) ? seq : _max_seq_number;)
zgu@3900:   return seq;
zgu@3900: }
zgu@3900: 
zgu@3900: 
zgu@3900: 
zgu@3900: bool VMMemRegion::contains(const VMMemRegion* mr) const {
zgu@3900:   assert(base() != 0, "no base address");
zgu@3900:   assert(size() != 0 || committed_size() != 0,
zgu@3900:     "no range");
zgu@3900:   address base_addr = base();
zgu@3900:   address end_addr = base_addr +
zgu@3900:     (is_reserve_record()? reserved_size(): committed_size());
zgu@3900:   if (mr->is_reserve_record()) {
zgu@3900:     if (mr->base() == base_addr && mr->size() == size()) {
zgu@3900:       // the same range
zgu@3900:       return true;
zgu@3900:     }
zgu@3900:     return false;
zgu@3900:   } else if (mr->is_commit_record() || mr->is_uncommit_record()) {
zgu@3900:     assert(mr->base() != 0 && mr->committed_size() > 0,
zgu@3900:       "bad record");
zgu@3900:     return (mr->base() >= base_addr &&
zgu@3900:       (mr->base() + mr->committed_size()) <= end_addr);
zgu@3900:   } else if (mr->is_type_tagging_record()) {
zgu@3900:     assert(mr->base() != 0, "no base");
zgu@3900:     return mr->base() == base_addr;
zgu@3900:   } else if (mr->is_release_record()) {
zgu@3900:     assert(mr->base() != 0 && mr->size() > 0,
zgu@3900:       "bad record");
zgu@3900:     return (mr->base() == base_addr && mr->size() == size());
zgu@3900:   } else {
zgu@3900:     assert(false, "what happened?");
zgu@3900:     return false;
zgu@3900:   }
zgu@3900: }