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src/share/vm/oops/instanceOop.hpp@710a3c8b516e (annotated)
src/share/vm/oops/instanceOop.hpp
Tue, 08 Aug 2017 15:57:29 +0800
- author
- aoqi
- date
- Tue, 08 Aug 2017 15:57:29 +0800
- changeset 6876
- 710a3c8b516e
- parent 6198
- 55fb97c4c58d
- parent 0
- f90c822e73f8
- permissions
- -rw-r--r--
merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_OOPS_INSTANCEOOP_HPP |
| aoqi@0 | 26 | #define SHARE_VM_OOPS_INSTANCEOOP_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "oops/oop.hpp" |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | // An instanceOop is an instance of a Java Class |
| aoqi@0 | 31 | // Evaluating "new HashTable()" will create an instanceOop. |
| aoqi@0 | 32 | |
| aoqi@0 | 33 | class instanceOopDesc : public oopDesc { |
| aoqi@0 | 34 | public: |
| aoqi@0 | 35 | // aligned header size. |
| aoqi@0 | 36 | static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; } |
| aoqi@0 | 37 | |
| aoqi@0 | 38 | // If compressed, the offset of the fields of the instance may not be aligned. |
| aoqi@0 | 39 | static int base_offset_in_bytes() { |
| aoqi@0 | 40 | // offset computation code breaks if UseCompressedClassPointers |
| aoqi@0 | 41 | // only is true |
| aoqi@0 | 42 | return (UseCompressedOops && UseCompressedClassPointers) ? |
| aoqi@0 | 43 | klass_gap_offset_in_bytes() : |
| aoqi@0 | 44 | sizeof(instanceOopDesc); |
| aoqi@0 | 45 | } |
| aoqi@0 | 46 | |
| aoqi@0 | 47 | static bool contains_field_offset(int offset, int nonstatic_field_size) { |
| aoqi@0 | 48 | int base_in_bytes = base_offset_in_bytes(); |
| aoqi@0 | 49 | return (offset >= base_in_bytes && |
| aoqi@0 | 50 | (offset-base_in_bytes) < nonstatic_field_size * heapOopSize); |
| aoqi@0 | 51 | } |
| aoqi@0 | 52 | }; |
| aoqi@0 | 53 | |
| aoqi@0 | 54 | #endif // SHARE_VM_OOPS_INSTANCEOOP_HPP |
