1 /*
2 * Copyright (c) 2023, 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_METHODFLAGS_HPP
26 #define SHARE_OOPS_METHODFLAGS_HPP
27
28 #include "runtime/atomic.hpp"
29 #include "utilities/globalDefinitions.hpp"
30 #include "utilities/macros.hpp"
31
32 class outputStream;
33
34 // The MethodFlags class contains the writeable flags aka. status associated with
35 // an Method, and their associated accessors.
36 // _status are set at runtime and require atomic access.
37 // These flags are JVM internal and not part of the AccessFlags classfile specification.
38
39 class MethodFlags {
40 friend class VMStructs;
41 friend class JVMCIVMStructs;
42 /* end of list */
43
44 #define M_STATUS_DO(status) \
45 status(has_monitor_bytecodes , 1 << 0) /* Method contains monitorenter/monitorexit bytecodes */ \
46 status(has_jsrs , 1 << 1) \
47 status(is_old , 1 << 2) /* RedefineClasses() has replaced this method */ \
48 status(is_obsolete , 1 << 3) /* RedefineClasses() has made method obsolete */ \
49 status(is_deleted , 1 << 4) /* RedefineClasses() has deleted this method */ \
50 status(is_prefixed_native , 1 << 5) /* JVMTI has prefixed this native method */ \
51 status(monitor_matching , 1 << 6) /* True if we know that monitorenter/monitorexit bytecodes match */ \
52 status(queued_for_compilation , 1 << 7) \
53 status(is_not_c2_compilable , 1 << 8) \
54 status(is_not_c1_compilable , 1 << 9) \
55 status(is_not_c2_osr_compilable , 1 << 10) \
56 status(force_inline , 1 << 11) /* Annotations but also set/reset at runtime */ \
57 status(dont_inline , 1 << 12) \
58 status(has_loops_flag , 1 << 13) /* Method has loops */ \
59 status(has_loops_flag_init , 1 << 14) /* The loop flag has been initialized */ \
60 status(on_stack_flag , 1 << 15) /* RedefineClasses support to keep Metadata from being cleaned */ \
61 /* end of list */
62
63 #define M_STATUS_ENUM_NAME(name, value) _misc_##name = value,
64 enum {
65 M_STATUS_DO(M_STATUS_ENUM_NAME)
66 };
67 #undef M_STATUS_ENUM_NAME
68
69 // These flags are written during execution so require atomic stores
70 u4 _status;
71
72 public:
73
74 MethodFlags() : _status(0) {}
75
76 // Create getters and setters for the status values.
77 #define M_STATUS_GET_SET(name, ignore) \
78 bool name() const { return (_status & _misc_##name) != 0; } \
79 void set_##name(bool b) { \
80 if (b) { \
81 atomic_set_bits(_misc_##name); \
82 } else { \
83 atomic_clear_bits(_misc_##name); \
84 } \
85 }
86 M_STATUS_DO(M_STATUS_GET_SET)
87 #undef M_STATUS_GET_SET
88
89 int as_int() const { return _status; }
90 void atomic_set_bits(u4 bits) { Atomic::fetch_then_or(&_status, bits); }
91 void atomic_clear_bits(u4 bits) { Atomic::fetch_then_and(&_status, ~bits); }
92 void print_on(outputStream* st) const;
93 };
94
95 #endif // SHARE_OOPS_METHODFLAGS_HPP