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 1997-2006 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
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23 */
25 // A constantPoolKlass is the klass of a constantPoolOop
27 class constantPoolKlass : public Klass {
28 juint _alloc_size; // allocation profiling support
29 public:
30 // Dispatched klass operations
31 bool oop_is_constantPool() const { return true; }
32 int oop_size(oop obj) const;
33 int klass_oop_size() const { return object_size(); }
35 // Allocation
36 DEFINE_ALLOCATE_PERMANENT(constantPoolKlass);
37 constantPoolOop allocate(int length, TRAPS);
38 static klassOop create_klass(TRAPS);
40 // Casting from klassOop
41 static constantPoolKlass* cast(klassOop k) {
42 assert(k->klass_part()->oop_is_constantPool(), "cast to constantPoolKlass");
43 return (constantPoolKlass*) k->klass_part();
44 }
46 // Sizing
47 static int header_size() { return oopDesc::header_size() + sizeof(constantPoolKlass)/HeapWordSize; }
48 int object_size() const { return align_object_size(header_size()); }
50 // Garbage collection
51 void oop_follow_contents(oop obj);
52 int oop_adjust_pointers(oop obj);
54 // Parallel Scavenge and Parallel Old
55 PARALLEL_GC_DECLS
57 // Iterators
58 int oop_oop_iterate(oop obj, OopClosure* blk);
59 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr);
61 // Allocation profiling support
62 // no idea why this is pure virtual and not in Klass ???
63 juint alloc_size() const { return _alloc_size; }
64 void set_alloc_size(juint n) { _alloc_size = n; }
66 #ifndef PRODUCT
67 public:
68 // Printing
69 void oop_print_on(oop obj, outputStream* st);
70 #endif
72 public:
73 // Verification
74 const char* internal_name() const;
75 void oop_verify_on(oop obj, outputStream* st);
76 // tells whether obj is partially constructed (gc during class loading)
77 bool oop_partially_loaded(oop obj) const;
78 void oop_set_partially_loaded(oop obj);
79 #ifndef PRODUCT
80 // Compile the world support
81 static void preload_and_initialize_all_classes(oop constant_pool, TRAPS);
82 #endif
83 };