Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/oops/instanceOop.hpp@46f6f063b272 (annotated)
src/share/vm/oops/instanceOop.hpp
Thu, 21 Mar 2013 09:27:54 +0100
- author
- roland
- date
- Thu, 21 Mar 2013 09:27:54 +0100
- changeset 4860
- 46f6f063b272
- parent 4159
- 8e47bac5643a
- child 5694
- 7944aba7ba41
- permissions
- -rw-r--r--
7153771: array bound check elimination for c1
Summary: when possible optimize out array bound checks, inserting predicates when needed.
Reviewed-by: never, kvn, twisti
Contributed-by: thomaswue <thomas.wuerthinger@oracle.com>
| duke@435 | 1 | /* |
| coleenp@4037 | 2 | * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
| trims@1907 | 21 | * questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| stefank@2314 | 25 | #ifndef SHARE_VM_OOPS_INSTANCEOOP_HPP |
| stefank@2314 | 26 | #define SHARE_VM_OOPS_INSTANCEOOP_HPP |
| stefank@2314 | 27 | |
| stefank@2314 | 28 | #include "oops/oop.hpp" |
| stefank@2314 | 29 | |
| duke@435 | 30 | // An instanceOop is an instance of a Java Class |
| duke@435 | 31 | // Evaluating "new HashTable()" will create an instanceOop. |
| duke@435 | 32 | |
| duke@435 | 33 | class instanceOopDesc : public oopDesc { |
| duke@435 | 34 | public: |
| coleenp@548 | 35 | // aligned header size. |
| duke@435 | 36 | static int header_size() { return sizeof(instanceOopDesc)/HeapWordSize; } |
| coleenp@548 | 37 | |
| coleenp@548 | 38 | // If compressed, the offset of the fields of the instance may not be aligned. |
| coleenp@548 | 39 | static int base_offset_in_bytes() { |
| roland@4159 | 40 | // offset computation code breaks if UseCompressedKlassPointers |
| roland@4159 | 41 | // only is true |
| roland@4159 | 42 | return (UseCompressedOops && UseCompressedKlassPointers) ? |
| coleenp@548 | 43 | klass_gap_offset_in_bytes() : |
| coleenp@548 | 44 | sizeof(instanceOopDesc); |
| coleenp@548 | 45 | } |
| coleenp@548 | 46 | |
| coleenp@548 | 47 | static bool contains_field_offset(int offset, int nonstatic_field_size) { |
| coleenp@548 | 48 | int base_in_bytes = base_offset_in_bytes(); |
| kvn@600 | 49 | return (offset >= base_in_bytes && |
| kvn@600 | 50 | (offset-base_in_bytes) < nonstatic_field_size * heapOopSize); |
| coleenp@548 | 51 | } |
| duke@435 | 52 | }; |
| stefank@2314 | 53 | |
| stefank@2314 | 54 | #endif // SHARE_VM_OOPS_INSTANCEOOP_HPP |
