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.
22 *
23 */
24
25 #ifndef SHARE_OOPS_INSTANCEKLASSMISCSTATUS_HPP
26 #define SHARE_OOPS_INSTANCEKLASSMISCSTATUS_HPP
27
28 class ClassLoaderData;
29
30 class InstanceKlassMiscStatus {
31 friend class VMStructs;
32 friend class JVMCIVMStructs;
33
34 #define IK_FLAGS_DO(flag) \
35 flag(rewritten , 1 << 0) /* methods rewritten. */ \
36 flag(has_nonstatic_fields , 1 << 1) /* for sizing with UseCompressedOops */ \
37 flag(should_verify_class , 1 << 2) /* allow caching of preverification */ \
38 flag(unused , 1 << 3) /* not currently used */ \
39 flag(is_contended , 1 << 4) /* marked with contended annotation */ \
40 flag(has_nonstatic_concrete_methods , 1 << 5) /* class/superclass/implemented interfaces has non-static, concrete methods */ \
41 flag(declares_nonstatic_concrete_methods, 1 << 6) /* directly declares non-static, concrete methods */ \
42 flag(has_been_redefined , 1 << 7) /* class has been redefined */ \
43 flag(shared_loading_failed , 1 << 8) /* class has been loaded from shared archive */ \
44 flag(is_scratch_class , 1 << 9) /* class is the redefined scratch class */ \
45 flag(is_shared_boot_class , 1 << 10) /* defining class loader is boot class loader */ \
46 flag(is_shared_platform_class , 1 << 11) /* defining class loader is platform class loader */ \
47 flag(is_shared_app_class , 1 << 12) /* defining class loader is app class loader */ \
48 flag(has_contended_annotations , 1 << 13) /* has @Contended annotation */ \
49 flag(has_inline_type_fields , 1 << 14) /* has inline fields and related embedded section is not empty */ \
50 flag(is_empty_inline_type , 1 << 15) /* empty inline type (*) */ \
51 flag(is_naturally_atomic , 1 << 16) /* loaded/stored in one instruction */ \
52 flag(is_declared_atomic , 1 << 17) /* Listed -XX:ForceNonTearable=clist option */ \
53 flag(carries_value_modifier , 1 << 18) /* the class or one of its super types has the ACC_VALUE modifier */ \
54 flag(carries_identity_modifier , 1 << 19) /* the class or one of its super types has the ACC_IDENTITY modifier */
55
56 /* (*) An inline type is considered empty if it contains no non-static fields or
57 if it contains only empty inline fields. Note that JITs have a slightly different
58 definition: empty inline fields must be flattened otherwise the container won't
59 be considered empty */
60
61 #define IK_FLAGS_ENUM_NAME(name, value) _misc_##name = value,
62 enum {
63 IK_FLAGS_DO(IK_FLAGS_ENUM_NAME)
64 };
65 #undef IK_FLAGS_ENUM_NAME
66
67 u2 shared_loader_type_bits() const {
68 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
69 }
70
71 // These flags are write-once before the class is published and then read-only so don't require atomic updates.
72 u4 _flags;
73
74 public:
75
76 InstanceKlassMiscStatus() : _flags(0) {}
77
78 // Create getters and setters for the flag values.
79 #define IK_FLAGS_GET(name, ignore) \
80 bool name() const { return (_flags & _misc_##name) != 0; }
81 IK_FLAGS_DO(IK_FLAGS_GET)
82 #undef IK_FLAGS_GET
83
84 #define IK_FLAGS_SET(name, ignore) \
85 void set_##name(bool b) { \
86 assert(!name(), "set once"); \
87 if (b) _flags |= _misc_##name; \
88 }
89 IK_FLAGS_DO(IK_FLAGS_SET)
90 #undef IK_FLAGS_SET
91
92 bool is_shared_unregistered_class() const {
93 return (_flags & shared_loader_type_bits()) == 0;
94 }
95
96 void set_shared_class_loader_type(s2 loader_type);
97
98 void assign_class_loader_type(const ClassLoaderData* cld);
99
100 u4 flags() const { return _flags; }
101
102 static u4 is_empty_inline_type_value() {
103 return _misc_is_empty_inline_type;
104 }
105 };
106
107 #endif // SHARE_OOPS_INSTANCEKLASSMISCSTATUS_HPP