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
1 /*
2 * Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 class constantPoolCacheKlass: public Klass {
26 juint _alloc_size; // allocation profiling support
27 public:
28 // Dispatched klass operations
29 bool oop_is_constantPoolCache() const { return true; }
30 int oop_size(oop obj) const;
31 int klass_oop_size() const { return object_size(); }
33 // Allocation
34 DEFINE_ALLOCATE_PERMANENT(constantPoolCacheKlass);
35 constantPoolCacheOop allocate(int length, TRAPS);
36 static klassOop create_klass(TRAPS);
38 // Casting from klassOop
39 static constantPoolCacheKlass* cast(klassOop k) {
40 assert(k->klass_part()->oop_is_constantPoolCache(), "cast to constantPoolCacheKlass");
41 return (constantPoolCacheKlass*)k->klass_part();
42 }
44 // Sizing
45 static int header_size() { return oopDesc::header_size() + sizeof(constantPoolCacheKlass)/HeapWordSize; }
46 int object_size() const { return align_object_size(header_size()); }
48 // Garbage collection
49 void oop_follow_contents(oop obj);
50 int oop_adjust_pointers(oop obj);
52 // Parallel Scavenge and Parallel Old
53 PARALLEL_GC_DECLS
55 // Iterators
56 int oop_oop_iterate(oop obj, OopClosure* blk);
57 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
59 // Allocation profiling support
60 juint alloc_size() const { return _alloc_size; }
61 void set_alloc_size(juint n) { _alloc_size = n; }
63 #ifndef PRODUCT
64 public:
65 // Printing
66 void oop_print_on(oop obj, outputStream* st);
67 #endif
69 public:
70 // Verification
71 const char* internal_name() const;
72 void oop_verify_on(oop obj, outputStream* st);
73 };