1 /* 2 * Copyright (c) 1997, 2000, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // Data structure for holding monitors for one activation during 26 // deoptimization. 27 28 class MonitorChunk: public CHeapObj { 29 private: 30 int _number_of_monitors; 31 BasicObjectLock* _monitors; 32 BasicObjectLock* monitors() const { return _monitors; } 33 MonitorChunk* _next; 34 public: 35 // Constructor 36 MonitorChunk(int number_on_monitors); 37 ~MonitorChunk(); 38 39 // link operations 40 MonitorChunk* next() const { return _next; } 41 void set_next(MonitorChunk* next) { _next = next; } 42 43 // Tells whether the monitor chunk is linked into the JavaThread 44 bool is_linked() const { return next() != NULL; } 45 46 // Returns the number of monitors 47 int number_of_monitors() const { return _number_of_monitors; } 48 49 // Returns the index'th monitor 50 BasicObjectLock* at(int index) { assert(index >= 0 && index < number_of_monitors(), "out of bounds check"); return &monitors()[index]; } 51 52 53 // Memory management 54 void oops_do(OopClosure* f); 55 56 // Tells whether the addr point into the monitors. 57 bool contains(void* addr) const { return (addr >= (void*) monitors()) && (addr < (void*) (monitors() + number_of_monitors())); } 58 };