1 /*
2 * Copyright (c) 1997, 2011, 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_KLASSOOP_HPP
26 #define SHARE_VM_OOPS_KLASSOOP_HPP
27
28 #include "oops/oop.hpp"
29
30 // A klassOop is the C++ equivalent of a Java class.
31 // Part of a klassOopDesc is a Klass which handle the
32 // dispatching for the C++ method calls.
33
34 // klassOop object layout:
35 // [header ]
36 // [klass_field]
37 // [KLASS ]
38
39 class klassOopDesc : public oopDesc {
40 public:
41 // size operation
42 static int header_size() { return sizeof(klassOopDesc)/HeapWordSize; }
43
44 // support for code generation
45 static int klass_part_offset_in_bytes() { return sizeof(klassOopDesc); }
46
47 // returns the Klass part containing dispatching behavior
48 Klass* klass_part() const { return (Klass*)((address)this + klass_part_offset_in_bytes()); }
49
50 // Convenience wrapper
51 inline oop java_mirror() const;
52
53 private:
54 // These have no implementation since klassOop should never be accessed in this fashion
55 oop obj_field(int offset) const;
56 volatile oop obj_field_volatile(int offset) const;
57 void obj_field_put(int offset, oop value);
58 void obj_field_put_raw(int offset, oop value);
59 void obj_field_put_volatile(int offset, oop value);
60
61 jbyte byte_field(int offset) const;
62 void byte_field_put(int offset, jbyte contents);
63
64 jchar char_field(int offset) const;
65 void char_field_put(int offset, jchar contents);
66
67 jboolean bool_field(int offset) const;
68 void bool_field_put(int offset, jboolean contents);
69
70 jint int_field(int offset) const;
71 void int_field_put(int offset, jint contents);
72
73 jshort short_field(int offset) const;
74 void short_field_put(int offset, jshort contents);
75
76 jlong long_field(int offset) const;
77 void long_field_put(int offset, jlong contents);
78
79 jfloat float_field(int offset) const;
80 void float_field_put(int offset, jfloat contents);
81
82 jdouble double_field(int offset) const;
83 void double_field_put(int offset, jdouble contents);
84
85 address address_field(int offset) const;
86 void address_field_put(int offset, address contents);
87
88 oop obj_field_acquire(int offset) const;
89 void release_obj_field_put(int offset, oop value);
90
91 jbyte byte_field_acquire(int offset) const;
92 void release_byte_field_put(int offset, jbyte contents);
93
94 jchar char_field_acquire(int offset) const;
95 void release_char_field_put(int offset, jchar contents);
96
97 jboolean bool_field_acquire(int offset) const;
98 void release_bool_field_put(int offset, jboolean contents);
99
100 jint int_field_acquire(int offset) const;
101 void release_int_field_put(int offset, jint contents);
102
103 jshort short_field_acquire(int offset) const;
104 void release_short_field_put(int offset, jshort contents);
105
106 jlong long_field_acquire(int offset) const;
107 void release_long_field_put(int offset, jlong contents);
108
109 jfloat float_field_acquire(int offset) const;
110 void release_float_field_put(int offset, jfloat contents);
111
112 jdouble double_field_acquire(int offset) const;
113 void release_double_field_put(int offset, jdouble contents);
114
115 address address_field_acquire(int offset) const;
116 void release_address_field_put(int offset, address contents);
117 };
118
119 #endif // SHARE_VM_OOPS_KLASSOOP_HPP