1 /*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe
26 // the format of Java objects so the fields can be accessed from C++.
27 // oopDesc is abstract.
28 // (see oopHierarchy for complete oop class hierarchy)
29 //
30 // no virtual functions allowed
31
32 // store into oop with store check
33 template <class T> inline void oop_store(T* p, oop v);
34 template <class T> inline void oop_store(volatile T* p, oop v);
35
36 // store into oop without store check
37 template <class T> inline void oop_store_without_check(T* p, oop v);
38 template <class T> inline void oop_store_without_check(volatile T* p, oop v);
39
40 extern bool always_do_update_barrier;
41
42 // Forward declarations.
43 class OopClosure;
44 class ScanClosure;
45 class FastScanClosure;
46 class FilteringClosure;
47 class BarrierSet;
48 class CMSIsAliveClosure;
49
50 class PSPromotionManager;
51 class ParCompactionManager;
52
53 class oopDesc {
54 friend class VMStructs;
55 private:
56 volatile markOop _mark;
57 union _metadata {
58 wideKlassOop _klass;
386
387 void oop_iterate_header(OopClosure* blk);
388 void oop_iterate_header(OopClosure* blk, MemRegion mr);
389
390 // identity hash; returns the identity hash key (computes it if necessary)
391 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a
392 // safepoint if called on a biased object. Calling code must be aware of that.
393 intptr_t identity_hash();
394 intptr_t slow_identity_hash();
395
396 // marks are forwarded to stack when object is locked
397 bool has_displaced_mark() const;
398 markOop displaced_mark() const;
399 void set_displaced_mark(markOop m);
400
401 // for code generation
402 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); }
403 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); }
404 static int klass_gap_offset_in_bytes();
405 };
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1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_OOP_HPP
26 #define SHARE_VM_OOPS_OOP_HPP
27
28 #include "memory/iterator.hpp"
29 #include "memory/memRegion.hpp"
30 #include "memory/specialized_oop_closures.hpp"
31 #include "utilities/top.hpp"
32
33 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe
34 // the format of Java objects so the fields can be accessed from C++.
35 // oopDesc is abstract.
36 // (see oopHierarchy for complete oop class hierarchy)
37 //
38 // no virtual functions allowed
39
40 // store into oop with store check
41 template <class T> void oop_store(T* p, oop v);
42 template <class T> void oop_store(volatile T* p, oop v);
43
44 // store into oop without store check
45 template <class T> void oop_store_without_check(T* p, oop v);
46 template <class T> void oop_store_without_check(volatile T* p, oop v);
47
48 extern bool always_do_update_barrier;
49
50 // Forward declarations.
51 class OopClosure;
52 class ScanClosure;
53 class FastScanClosure;
54 class FilteringClosure;
55 class BarrierSet;
56 class CMSIsAliveClosure;
57
58 class PSPromotionManager;
59 class ParCompactionManager;
60
61 class oopDesc {
62 friend class VMStructs;
63 private:
64 volatile markOop _mark;
65 union _metadata {
66 wideKlassOop _klass;
394
395 void oop_iterate_header(OopClosure* blk);
396 void oop_iterate_header(OopClosure* blk, MemRegion mr);
397
398 // identity hash; returns the identity hash key (computes it if necessary)
399 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a
400 // safepoint if called on a biased object. Calling code must be aware of that.
401 intptr_t identity_hash();
402 intptr_t slow_identity_hash();
403
404 // marks are forwarded to stack when object is locked
405 bool has_displaced_mark() const;
406 markOop displaced_mark() const;
407 void set_displaced_mark(markOop m);
408
409 // for code generation
410 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); }
411 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); }
412 static int klass_gap_offset_in_bytes();
413 };
414
415 #endif // SHARE_VM_OOPS_OOP_HPP
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