Mon, 09 Jun 2008 11:51:19 -0400
6687581: Make CMS work with compressed oops
Summary: Make FreeChunk read markword instead of LSB in _klass pointer to indicate that it's a FreeChunk for compressed oops.
Reviewed-by: ysr, jmasa
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1997-2002 Sun Microsystems, Inc. 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 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
duke@435 | 25 | // A klassOop is the C++ equivalent of a Java class. |
duke@435 | 26 | // Part of a klassOopDesc is a Klass which handle the |
duke@435 | 27 | // dispatching for the C++ method calls. |
duke@435 | 28 | |
duke@435 | 29 | // klassOop object layout: |
duke@435 | 30 | // [header ] |
duke@435 | 31 | // [klass_field] |
duke@435 | 32 | // [KLASS ] |
duke@435 | 33 | |
duke@435 | 34 | class klassOopDesc : public oopDesc { |
duke@435 | 35 | public: |
duke@435 | 36 | // size operation |
duke@435 | 37 | static int header_size() { return sizeof(klassOopDesc)/HeapWordSize; } |
duke@435 | 38 | |
duke@435 | 39 | // support for code generation |
duke@435 | 40 | static int klass_part_offset_in_bytes() { return sizeof(klassOopDesc); } |
duke@435 | 41 | |
duke@435 | 42 | // returns the Klass part containing dispatching behavior |
duke@435 | 43 | Klass* klass_part() { return (Klass*)((address)this + klass_part_offset_in_bytes()); } |
duke@435 | 44 | }; |