duke@435: /*
duke@435:  * Copyright 2000-2001 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: // A water mark points into a space and is used during GC to keep track of
duke@435: // progress.
duke@435: 
duke@435: class Space;
duke@435: 
duke@435: class WaterMark VALUE_OBJ_CLASS_SPEC {
duke@435:   friend class VMStructs;
duke@435:  private:
duke@435:   HeapWord* _point;
duke@435:   Space*    _space;
duke@435:  public:
duke@435:   // Accessors
duke@435:   Space* space() const        { return _space;  }
duke@435:   void set_space(Space* s)    { _space = s;     }
duke@435:   HeapWord* point() const     { return _point;  }
duke@435:   void set_point(HeapWord* p) { _point = p;     }
duke@435: 
duke@435:   // Constructors
duke@435:   WaterMark(Space* s, HeapWord* p) : _space(s), _point(p) {};
duke@435:   WaterMark() : _space(NULL), _point(NULL) {};
duke@435: };
duke@435: 
duke@435: inline bool operator==(const WaterMark& x, const WaterMark& y) {
duke@435:   return (x.point() == y.point()) && (x.space() == y.space());
duke@435: }
duke@435: 
duke@435: inline bool operator!=(const WaterMark& x, const WaterMark& y) {
duke@435:   return !(x == y);
duke@435: }