1 /* 2 * Copyright (c) 2000, 2015, 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 #ifndef SHARE_VM_GC_SHARED_WATERMARK_HPP 26 #define SHARE_VM_GC_SHARED_WATERMARK_HPP 27 28 #include "memory/allocation.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 31 // A water mark points into a space and is used during GC to keep track of 32 // progress. 33 34 class Space; 35 36 class WaterMark VALUE_OBJ_CLASS_SPEC { 37 friend class VMStructs; 38 private: 39 HeapWord* _point; 40 Space* _space; 41 public: 42 // Accessors 43 Space* space() const { return _space; } 44 void set_space(Space* s) { _space = s; } 45 HeapWord* point() const { return _point; } 46 void set_point(HeapWord* p) { _point = p; } 47 48 // Constructors 49 WaterMark(Space* s, HeapWord* p) : _space(s), _point(p) {}; 50 WaterMark() : _space(NULL), _point(NULL) {}; 51 }; 52 53 inline bool operator==(const WaterMark& x, const WaterMark& y) { 54 return (x.point() == y.point()) && (x.space() == y.space()); 55 } 56 57 inline bool operator!=(const WaterMark& x, const WaterMark& y) { 58 return !(x == y); 59 } 60 61 #endif // SHARE_VM_GC_SHARED_WATERMARK_HPP