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6197
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "services/memPtr.hpp"
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27 #include "services/memTracker.hpp"
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28
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29 volatile jint SequenceGenerator::_seq_number = 1;
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30 DEBUG_ONLY(jint SequenceGenerator::_max_seq_number = 1;)
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31 DEBUG_ONLY(volatile unsigned long SequenceGenerator::_generation = 0;)
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32
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33 jint SequenceGenerator::next() {
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34 jint seq = Atomic::add(1, &_seq_number);
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35 if (seq < 0) {
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36 MemTracker::shutdown(MemTracker::NMT_sequence_overflow);
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37 }
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38 assert(seq > 0, "counter overflow");
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39 DEBUG_ONLY(_max_seq_number = (seq > _max_seq_number) ? seq : _max_seq_number;)
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40 return seq;
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41 }
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42
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43
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44
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45 bool VMMemRegion::contains(const VMMemRegion* mr) const {
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46 assert(base() != 0, "no base address");
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47 assert(size() != 0 || committed_size() != 0,
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48 "no range");
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49 address base_addr = base();
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50 address end_addr = base_addr +
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51 (is_reserve_record()? reserved_size(): committed_size());
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52 if (mr->is_reserve_record()) {
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53 if (mr->base() == base_addr && mr->size() == size()) {
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54 // the same range
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55 return true;
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56 }
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57 return false;
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58 } else if (mr->is_commit_record() || mr->is_uncommit_record()) {
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59 assert(mr->base() != 0 && mr->committed_size() > 0,
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60 "bad record");
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61 return (mr->base() >= base_addr &&
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62 (mr->base() + mr->committed_size()) <= end_addr);
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63 } else if (mr->is_type_tagging_record()) {
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64 assert(mr->base() != 0, "no base");
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65 return mr->base() == base_addr;
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66 } else if (mr->is_release_record()) {
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67 assert(mr->base() != 0 && mr->size() > 0,
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68 "bad record");
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69 return (mr->base() == base_addr && mr->size() == size());
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70 } else {
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71 assert(false, "what happened?");
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72 return false;
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73 }
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74 }
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