1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/instanceOop.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,54 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_OOPS_INSTANCEOOP_HPP
1.29 +#define SHARE_VM_OOPS_INSTANCEOOP_HPP
1.30 +
1.31 +#include "oops/oop.hpp"
1.32 +
1.33 +// An instanceOop is an instance of a Java Class
1.34 +// Evaluating "new HashTable()" will create an instanceOop.
1.35 +
1.36 +class instanceOopDesc : public oopDesc {
1.37 + public:
1.38 + // aligned header size.
1.39 + static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; }
1.40 +
1.41 + // If compressed, the offset of the fields of the instance may not be aligned.
1.42 + static int base_offset_in_bytes() {
1.43 + // offset computation code breaks if UseCompressedClassPointers
1.44 + // only is true
1.45 + return (UseCompressedOops && UseCompressedClassPointers) ?
1.46 + klass_gap_offset_in_bytes() :
1.47 + sizeof(instanceOopDesc);
1.48 + }
1.49 +
1.50 + static bool contains_field_offset(int offset, int nonstatic_field_size) {
1.51 + int base_in_bytes = base_offset_in_bytes();
1.52 + return (offset >= base_in_bytes &&
1.53 + (offset-base_in_bytes) < nonstatic_field_size * heapOopSize);
1.54 + }
1.55 +};
1.56 +
1.57 +#endif // SHARE_VM_OOPS_INSTANCEOOP_HPP
