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1 /*
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2 * Copyright 1997-2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Data structure for holding monitors for one activation during
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26 // deoptimization.
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27
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28 class MonitorChunk: public CHeapObj {
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29 private:
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30 int _number_of_monitors;
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31 BasicObjectLock* _monitors;
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32 BasicObjectLock* monitors() const { return _monitors; }
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33 MonitorChunk* _next;
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34 public:
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35 // Constructor
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36 MonitorChunk(int number_on_monitors);
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37 ~MonitorChunk();
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38
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39 // link operations
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40 MonitorChunk* next() const { return _next; }
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41 void set_next(MonitorChunk* next) { _next = next; }
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42
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43 // Tells whether the monitor chunk is linked into the JavaThread
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44 bool is_linked() const { return next() != NULL; }
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45
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46 // Returns the number of monitors
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47 int number_of_monitors() const { return _number_of_monitors; }
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48
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49 // Returns the index'th monitor
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50 BasicObjectLock* at(int index) { assert(index >= 0 && index < number_of_monitors(), "out of bounds check"); return &monitors()[index]; }
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51
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52
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53 // Memory management
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54 void oops_do(OopClosure* f);
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55
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56 // Tells whether the addr point into the monitors.
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57 bool contains(void* addr) const { return (addr >= (void*) monitors()) && (addr < (void*) (monitors() + number_of_monitors())); }
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58 };
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