| /* |
| * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_OOPS_INSTANCEOOP_HPP |
| #define SHARE_VM_OOPS_INSTANCEOOP_HPP |
| |
| #include "oops/oop.hpp" |
| |
| // An instanceOop is an instance of a Java Class |
| // Evaluating "new HashTable()" will create an instanceOop. |
| |
| class instanceOopDesc : public oopDesc { |
| public: |
| // aligned header size. |
| static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; } |
| |
| // If compressed, the offset of the fields of the instance may not be aligned. |
| static int base_offset_in_bytes() { |
| // offset computation code breaks if UseCompressedClassPointers |
| // only is true |
| return (UseCompressedOops && UseCompressedClassPointers) ? |
| klass_gap_offset_in_bytes() : |
| sizeof(instanceOopDesc); |
| } |
| |
| static bool contains_field_offset(int offset, int nonstatic_field_size) { |
| int base_in_bytes = base_offset_in_bytes(); |
| return (offset >= base_in_bytes && |
| (offset-base_in_bytes) < nonstatic_field_size * heapOopSize); |
| } |
| }; |
| |
| #endif // SHARE_VM_OOPS_INSTANCEOOP_HPP |