duke@435: /*
duke@435:  * Copyright 1997-2000 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: // An instanceOop is an instance of a Java Class
duke@435: // Evaluating "new HashTable()" will create an instanceOop.
duke@435: 
duke@435: class instanceOopDesc : public oopDesc {
duke@435:  public:
coleenp@548:   // aligned header size.
duke@435:   static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; }
coleenp@548: 
coleenp@548:   // If compressed, the offset of the fields of the instance may not be aligned.
coleenp@548:   static int base_offset_in_bytes() {
coleenp@548:     return UseCompressedOops ?
coleenp@548:              klass_gap_offset_in_bytes() :
coleenp@548:              sizeof(instanceOopDesc);
coleenp@548:   }
coleenp@548: 
coleenp@548:   static bool contains_field_offset(int offset, int nonstatic_field_size) {
coleenp@548:     int base_in_bytes = base_offset_in_bytes();
kvn@600:     return (offset >= base_in_bytes &&
kvn@600:             (offset-base_in_bytes) < nonstatic_field_size * heapOopSize);
coleenp@548:   }
duke@435: };