1 /*
2 * Copyright (c) 1997, 2012, 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 *
45
46 extern bool always_do_update_barrier;
47
48 // Forward declarations.
49 class OopClosure;
50 class ScanClosure;
51 class FastScanClosure;
52 class FilteringClosure;
53 class BarrierSet;
54 class CMSIsAliveClosure;
55
56 class PSPromotionManager;
57 class ParCompactionManager;
58
59 class oopDesc {
60 friend class VMStructs;
61 private:
62 volatile markOop _mark;
63 union _metadata {
64 Klass* _klass;
65 narrowOop _compressed_klass;
66 } _metadata;
67
68 // Fast access to barrier set. Must be initialized.
69 static BarrierSet* _bs;
70
71 public:
72 markOop mark() const { return _mark; }
73 markOop* mark_addr() const { return (markOop*) &_mark; }
74
75 void set_mark(volatile markOop m) { _mark = m; }
76
77 void release_set_mark(markOop m);
78 markOop cas_set_mark(markOop new_mark, markOop old_mark);
79
80 // Used only to re-initialize the mark word (e.g., of promoted
81 // objects during a GC) -- requires a valid klass pointer
82 void init_mark();
83
84 Klass* klass() const;
85 Klass* klass_or_null() const volatile;
86 Klass** klass_addr();
87 narrowOop* compressed_klass_addr();
88
89 void set_klass(Klass* k);
90
91 // For klass field compression
92 int klass_gap() const;
93 void set_klass_gap(int z);
94 // For when the klass pointer is being used as a linked list "next" field.
95 void set_klass_to_list_ptr(oop k);
96 oop list_ptr_from_klass();
97
98 // size of object header, aligned to platform wordSize
99 static int header_size() { return sizeof(oopDesc)/HeapWordSize; }
100
101 // Returns whether this is an instance of k or an instance of a subclass of k
102 bool is_a(Klass* k) const;
103
104 // Returns the actual oop size of the object
105 int size();
106
107 // Sometimes (for complicated concurrency-related reasons), it is useful
172 // Encode oop if UseCompressedOops and store into the heap.
173 static void encode_store_heap_oop_not_null(narrowOop* p, oop v);
174 static void encode_store_heap_oop_not_null(oop* p, oop v);
175 static void encode_store_heap_oop(narrowOop* p, oop v);
176 static void encode_store_heap_oop(oop* p, oop v);
177
178 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v);
179 static void release_store_heap_oop(volatile oop* p, oop v);
180
181 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v);
182 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v);
183 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v);
184 static void release_encode_store_heap_oop(volatile oop* p, oop v);
185
186 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest);
187 static oop atomic_compare_exchange_oop(oop exchange_value,
188 volatile HeapWord *dest,
189 oop compare_value,
190 bool prebarrier = false);
191
192 // klass encoding for klass pointer in objects.
193 static narrowOop encode_klass_not_null(Klass* v);
194 static narrowOop encode_klass(Klass* v);
195
196 static Klass* decode_klass_not_null(narrowOop v);
197 static Klass* decode_klass(narrowOop v);
198
199 // Access to fields in a instanceOop through these methods.
200 oop obj_field(int offset) const;
201 volatile oop obj_field_volatile(int offset) const;
202 void obj_field_put(int offset, oop value);
203 void obj_field_put_raw(int offset, oop value);
204 void obj_field_put_volatile(int offset, oop value);
205
206 Metadata* metadata_field(int offset) const;
207 void metadata_field_put(int offset, Metadata* value);
208
209 jbyte byte_field(int offset) const;
210 void byte_field_put(int offset, jbyte contents);
211
212 jchar char_field(int offset) const;
213 void char_field_put(int offset, jchar contents);
214
215 jboolean bool_field(int offset) const;
216 void bool_field_put(int offset, jboolean contents);
217
218 jint int_field(int offset) const;
|
1 /*
2 * Copyright (c) 1997, 2013, 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 *
45
46 extern bool always_do_update_barrier;
47
48 // Forward declarations.
49 class OopClosure;
50 class ScanClosure;
51 class FastScanClosure;
52 class FilteringClosure;
53 class BarrierSet;
54 class CMSIsAliveClosure;
55
56 class PSPromotionManager;
57 class ParCompactionManager;
58
59 class oopDesc {
60 friend class VMStructs;
61 private:
62 volatile markOop _mark;
63 union _metadata {
64 Klass* _klass;
65 narrowKlass _compressed_klass;
66 } _metadata;
67
68 // Fast access to barrier set. Must be initialized.
69 static BarrierSet* _bs;
70
71 public:
72 markOop mark() const { return _mark; }
73 markOop* mark_addr() const { return (markOop*) &_mark; }
74
75 void set_mark(volatile markOop m) { _mark = m; }
76
77 void release_set_mark(markOop m);
78 markOop cas_set_mark(markOop new_mark, markOop old_mark);
79
80 // Used only to re-initialize the mark word (e.g., of promoted
81 // objects during a GC) -- requires a valid klass pointer
82 void init_mark();
83
84 Klass* klass() const;
85 Klass* klass_or_null() const volatile;
86 Klass** klass_addr();
87 narrowKlass* compressed_klass_addr();
88
89 void set_klass(Klass* k);
90
91 // For klass field compression
92 int klass_gap() const;
93 void set_klass_gap(int z);
94 // For when the klass pointer is being used as a linked list "next" field.
95 void set_klass_to_list_ptr(oop k);
96 oop list_ptr_from_klass();
97
98 // size of object header, aligned to platform wordSize
99 static int header_size() { return sizeof(oopDesc)/HeapWordSize; }
100
101 // Returns whether this is an instance of k or an instance of a subclass of k
102 bool is_a(Klass* k) const;
103
104 // Returns the actual oop size of the object
105 int size();
106
107 // Sometimes (for complicated concurrency-related reasons), it is useful
172 // Encode oop if UseCompressedOops and store into the heap.
173 static void encode_store_heap_oop_not_null(narrowOop* p, oop v);
174 static void encode_store_heap_oop_not_null(oop* p, oop v);
175 static void encode_store_heap_oop(narrowOop* p, oop v);
176 static void encode_store_heap_oop(oop* p, oop v);
177
178 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v);
179 static void release_store_heap_oop(volatile oop* p, oop v);
180
181 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v);
182 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v);
183 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v);
184 static void release_encode_store_heap_oop(volatile oop* p, oop v);
185
186 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest);
187 static oop atomic_compare_exchange_oop(oop exchange_value,
188 volatile HeapWord *dest,
189 oop compare_value,
190 bool prebarrier = false);
191
192 // Access to fields in a instanceOop through these methods.
193 oop obj_field(int offset) const;
194 volatile oop obj_field_volatile(int offset) const;
195 void obj_field_put(int offset, oop value);
196 void obj_field_put_raw(int offset, oop value);
197 void obj_field_put_volatile(int offset, oop value);
198
199 Metadata* metadata_field(int offset) const;
200 void metadata_field_put(int offset, Metadata* value);
201
202 jbyte byte_field(int offset) const;
203 void byte_field_put(int offset, jbyte contents);
204
205 jchar char_field(int offset) const;
206 void char_field_put(int offset, jchar contents);
207
208 jboolean bool_field(int offset) const;
209 void bool_field_put(int offset, jboolean contents);
210
211 jint int_field(int offset) const;
|