1 /*
2 * Copyright (c) 2022, 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.
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23 */
24
25 #ifndef SHARE_OOPS_INSTANCEKLASSFLAGS_HPP
26 #define SHARE_OOPS_INSTANCEKLASSFLAGS_HPP
27
28 class ClassLoaderData;
29
30 // The InstanceKlassFlags class contains the parse-time and writeable flags associated with
31 // an InstanceKlass, and their associated accessors.
32 // _flags are parse-time and constant in the InstanceKlass after that. _status are set at runtime and
33 // require atomic access.
34 // These flags are JVM internal and not part of the AccessFlags classfile specification.
35
36 class InstanceKlassFlags {
37 friend class VMStructs;
38 friend class JVMCIVMStructs;
39
40 #define IK_FLAGS_DO(flag) \
41 flag(rewritten , 1 << 0) /* methods rewritten. */ \
42 flag(has_nonstatic_fields , 1 << 1) /* for sizing with UseCompressedOops */ \
43 flag(should_verify_class , 1 << 2) /* allow caching of preverification */ \
44 flag(is_contended , 1 << 3) /* marked with contended annotation */ \
45 flag(has_nonstatic_concrete_methods , 1 << 4) /* class/superclass/implemented interfaces has non-static, concrete methods */ \
46 flag(declares_nonstatic_concrete_methods, 1 << 5) /* directly declares non-static, concrete methods */ \
47 flag(shared_loading_failed , 1 << 6) /* class has been loaded from shared archive */ \
48 flag(is_shared_boot_class , 1 << 7) /* defining class loader is boot class loader */ \
49 flag(is_shared_platform_class , 1 << 8) /* defining class loader is platform class loader */ \
50 flag(is_shared_app_class , 1 << 9) /* defining class loader is app class loader */ \
51 flag(has_contended_annotations , 1 << 10) /* has @Contended annotation */ \
52 flag(has_localvariable_table , 1 << 11) /* has localvariable information */ \
53 flag(has_miranda_methods , 1 << 12) /* True if this class has miranda methods in it's vtable */ \
54 flag(has_vanilla_constructor , 1 << 13) /* True if klass has a vanilla default constructor */ \
55 flag(has_final_method , 1 << 14) /* True if klass has final method */ \
56 /* end of list */
57
58 #define IK_FLAGS_ENUM_NAME(name, value) _misc_##name = value,
59 enum {
60 IK_FLAGS_DO(IK_FLAGS_ENUM_NAME)
61 };
62 #undef IK_FLAGS_ENUM_NAME
63
64 #define IK_STATUS_DO(status) \
65 status(is_being_redefined , 1 << 0) /* True if the klass is being redefined */ \
66 status(has_resolved_methods , 1 << 1) /* True if the klass has resolved MethodHandle methods */ \
67 status(has_been_redefined , 1 << 2) /* class has been redefined */ \
68 status(is_scratch_class , 1 << 3) /* class is the redefined scratch class */ \
69 status(is_marked_dependent , 1 << 4) /* class is the redefined scratch class */
70
71 #define IK_STATUS_ENUM_NAME(name, value) _misc_##name = value,
72 enum {
73 IK_STATUS_DO(IK_STATUS_ENUM_NAME)
74 };
75 #undef IK_STATUS_ENUM_NAME
76
77 u2 shared_loader_type_bits() const {
78 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
79 }
80
81 // These flags are write-once before the class is published and then read-only so don't require atomic updates.
82 u2 _flags;
83
84 // These flags are written during execution so require atomic stores
85 u1 _status;
86
87 public:
88
89 InstanceKlassFlags() : _flags(0), _status(0) {}
90
91 // Create getters and setters for the flag values.
92 #define IK_FLAGS_GET(name, ignore) \
93 bool name() const { return (_flags & _misc_##name) != 0; }
94 IK_FLAGS_DO(IK_FLAGS_GET)
95 #undef IK_FLAGS_GET
96
97 #define IK_FLAGS_SET(name, ignore) \
98 void set_##name(bool b) { \
99 assert_is_safe(name()); \
100 if (b) _flags |= _misc_##name; \
101 }
102 IK_FLAGS_DO(IK_FLAGS_SET)
103 #undef IK_FLAGS_SET
104
105 bool is_shared_unregistered_class() const {
106 return (_flags & shared_loader_type_bits()) == 0;
107 }
108
109 void set_shared_class_loader_type(s2 loader_type);
110
111 void assign_class_loader_type(const ClassLoaderData* cld);
112 void assert_is_safe(bool set) NOT_DEBUG_RETURN;
113
114 // Create getters and setters for the status values.
115 #define IK_STATUS_GET(name, ignore) \
116 bool name() const { return (_status & _misc_##name) != 0; }
117 IK_STATUS_DO(IK_STATUS_GET)
118 #undef IK_STATUS_GET
119
120 #define IK_STATUS_SET(name, ignore) \
121 void set_##name(bool b) { \
122 if (b) { \
123 atomic_set_bits(_misc_##name); \
124 } else { \
125 atomic_clear_bits(_misc_##name); \
126 } \
127 }
128 IK_STATUS_DO(IK_STATUS_SET)
129 #undef IK_STATUS_SET
130
131 void atomic_set_bits(u1 bits);
132 void atomic_clear_bits(u1 bits);
133 };
134
135 #endif // SHARE_OOPS_INSTANCEKLASSFLAGS_HPP