1 /*
2 * Copyright (c) 1997, 2010, 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.
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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_VM_UTILITIES_ACCESSFLAGS_HPP
26 #define SHARE_VM_UTILITIES_ACCESSFLAGS_HPP
27
28 #include "prims/jvm.h"
29 #include "utilities/top.hpp"
30
31 // AccessFlags is an abstraction over Java access flags.
32
33
34 enum {
35 // See jvm.h for shared JVM_ACC_XXX access flags
36
37 // HotSpot-specific access flags
38
39 // flags actually put in .class file
40 JVM_ACC_WRITTEN_FLAGS = 0x00007FFF,
41
42 // methodOop flags
43 JVM_ACC_MONITOR_MATCH = 0x10000000, // True if we know that monitorenter/monitorexit bytecodes match
44 JVM_ACC_HAS_MONITOR_BYTECODES = 0x20000000, // Method contains monitorenter/monitorexit bytecodes
45 JVM_ACC_HAS_LOOPS = 0x40000000, // Method has loops
46 JVM_ACC_LOOPS_FLAG_INIT = (int)0x80000000,// The loop flag has been initialized
47 JVM_ACC_QUEUED = 0x01000000, // Queued for compilation
48 JVM_ACC_NOT_C2_COMPILABLE = 0x02000000,
49 JVM_ACC_NOT_C1_COMPILABLE = 0x04000000,
50 JVM_ACC_NOT_OSR_COMPILABLE = 0x08000000,
51 JVM_ACC_HAS_LINE_NUMBER_TABLE = 0x00100000,
52 JVM_ACC_HAS_CHECKED_EXCEPTIONS = 0x00400000,
53 JVM_ACC_HAS_JSRS = 0x00800000,
54 JVM_ACC_IS_OLD = 0x00010000, // RedefineClasses() has replaced this method
55 JVM_ACC_IS_OBSOLETE = 0x00020000, // RedefineClasses() has made method obsolete
56 JVM_ACC_IS_PREFIXED_NATIVE = 0x00040000, // JVMTI has prefixed this native method
57
58 JVM_MH_INVOKE_BITS // = 0x10001100 // MethodHandle.invoke quasi-native
59 = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_MONITOR_MATCH),
60
61 // klassOop flags
62 JVM_ACC_HAS_MIRANDA_METHODS = 0x10000000, // True if this class has miranda methods in it's vtable
63 JVM_ACC_HAS_VANILLA_CONSTRUCTOR = 0x20000000, // True if klass has a vanilla default constructor
64 JVM_ACC_HAS_FINALIZER = 0x40000000, // True if klass has a non-empty finalize() method
65 JVM_ACC_IS_CLONEABLE = (int)0x80000000,// True if klass supports the Clonable interface
66 JVM_ACC_HAS_FINAL_METHOD = 0x01000000, // True if klass has final method
67
68 // klassOop and methodOop flags
69 JVM_ACC_HAS_LOCAL_VARIABLE_TABLE= 0x00200000,
70
71 JVM_ACC_PROMOTED_FLAGS = 0x00200000, // flags promoted from methods to the holding klass
72
73 // field flags
74 // Note: these flags must be defined in the low order 16 bits because
75 // instanceKlass only stores a ushort worth of information from the
76 // AccessFlags value.
77 // These bits must not conflict with any other field-related access flags
78 // (e.g., ACC_ENUM).
79 // Note that the class-related ACC_ANNOTATION bit conflicts with these flags.
80 JVM_ACC_FIELD_ACCESS_WATCHED = 0x00002000, // field access is watched by JVMTI
81 JVM_ACC_FIELD_MODIFICATION_WATCHED = 0x00008000, // field modification is watched by JVMTI
82
83 // flags accepted by set_field_flags()
84 JVM_ACC_FIELD_FLAGS = 0x00008000 | JVM_ACC_WRITTEN_FLAGS
85
86 };
87
88
89 class AccessFlags VALUE_OBJ_CLASS_SPEC {
90 friend class VMStructs;
91 private:
92 jint _flags;
93
94 public:
95 // Java access flags
96 bool is_public () const { return (_flags & JVM_ACC_PUBLIC ) != 0; }
97 bool is_private () const { return (_flags & JVM_ACC_PRIVATE ) != 0; }
98 bool is_protected () const { return (_flags & JVM_ACC_PROTECTED ) != 0; }
99 bool is_static () const { return (_flags & JVM_ACC_STATIC ) != 0; }
100 bool is_final () const { return (_flags & JVM_ACC_FINAL ) != 0; }
101 bool is_synchronized() const { return (_flags & JVM_ACC_SYNCHRONIZED) != 0; }
102 bool is_super () const { return (_flags & JVM_ACC_SUPER ) != 0; }
103 bool is_volatile () const { return (_flags & JVM_ACC_VOLATILE ) != 0; }
104 bool is_transient () const { return (_flags & JVM_ACC_TRANSIENT ) != 0; }
105 bool is_native () const { return (_flags & JVM_ACC_NATIVE ) != 0; }
106 bool is_interface () const { return (_flags & JVM_ACC_INTERFACE ) != 0; }
107 bool is_abstract () const { return (_flags & JVM_ACC_ABSTRACT ) != 0; }
108 bool is_strict () const { return (_flags & JVM_ACC_STRICT ) != 0; }
109
110 // Attribute flags
111 bool is_synthetic () const { return (_flags & JVM_ACC_SYNTHETIC ) != 0; }
112
113 // methodOop flags
114 bool is_monitor_matching () const { return (_flags & JVM_ACC_MONITOR_MATCH ) != 0; }
115 bool has_monitor_bytecodes () const { return (_flags & JVM_ACC_HAS_MONITOR_BYTECODES ) != 0; }
116 bool has_loops () const { return (_flags & JVM_ACC_HAS_LOOPS ) != 0; }
117 bool loops_flag_init () const { return (_flags & JVM_ACC_LOOPS_FLAG_INIT ) != 0; }
118 bool queued_for_compilation () const { return (_flags & JVM_ACC_QUEUED ) != 0; }
119 bool is_not_c1_compilable () const { return (_flags & JVM_ACC_NOT_C1_COMPILABLE ) != 0; }
120 bool is_not_c2_compilable () const { return (_flags & JVM_ACC_NOT_C2_COMPILABLE ) != 0; }
121 bool is_not_osr_compilable () const { return (_flags & JVM_ACC_NOT_OSR_COMPILABLE ) != 0; }
122 bool has_linenumber_table () const { return (_flags & JVM_ACC_HAS_LINE_NUMBER_TABLE ) != 0; }
123 bool has_checked_exceptions () const { return (_flags & JVM_ACC_HAS_CHECKED_EXCEPTIONS ) != 0; }
124 bool has_jsrs () const { return (_flags & JVM_ACC_HAS_JSRS ) != 0; }
125 bool is_old () const { return (_flags & JVM_ACC_IS_OLD ) != 0; }
126 bool is_obsolete () const { return (_flags & JVM_ACC_IS_OBSOLETE ) != 0; }
127 bool is_prefixed_native () const { return (_flags & JVM_ACC_IS_PREFIXED_NATIVE ) != 0; }
128
129 // JSR 292: A method of the form MethodHandle.invoke(A...)R method is
130 // neither bytecoded nor a JNI native, but rather a fast call through
131 // a lightweight method handle object. Because it is not bytecoded,
132 // it has the native bit set, but the monitor-match bit is also set
133 // to distinguish it from a JNI native (which never has the match bit set).
134 // The synthetic bit is also present, because such a method is never
135 // explicitly defined in Java code.
136 bool is_method_handle_invoke () const { return (_flags & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS; }
137
138 // klassOop flags
139 bool has_miranda_methods () const { return (_flags & JVM_ACC_HAS_MIRANDA_METHODS ) != 0; }
140 bool has_vanilla_constructor () const { return (_flags & JVM_ACC_HAS_VANILLA_CONSTRUCTOR) != 0; }
141 bool has_finalizer () const { return (_flags & JVM_ACC_HAS_FINALIZER ) != 0; }
142 bool has_final_method () const { return (_flags & JVM_ACC_HAS_FINAL_METHOD ) != 0; }
143 bool is_cloneable () const { return (_flags & JVM_ACC_IS_CLONEABLE ) != 0; }
144 // klassOop and methodOop flags
145 bool has_localvariable_table () const { return (_flags & JVM_ACC_HAS_LOCAL_VARIABLE_TABLE) != 0; }
146 void set_has_localvariable_table() { atomic_set_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); }
147 void clear_has_localvariable_table() { atomic_clear_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); }
148
149 // field flags
150 bool is_field_access_watched() const { return (_flags & JVM_ACC_FIELD_ACCESS_WATCHED) != 0; }
151 bool is_field_modification_watched() const
152 { return (_flags & JVM_ACC_FIELD_MODIFICATION_WATCHED) != 0; }
153
154 // get .class file flags
155 jint get_flags () const { return (_flags & JVM_ACC_WRITTEN_FLAGS); }
156
157 // Initialization
158 void add_promoted_flags(jint flags) { _flags |= (flags & JVM_ACC_PROMOTED_FLAGS); }
159 void set_field_flags(jint flags) { _flags = (flags & JVM_ACC_FIELD_FLAGS); }
160 void set_flags(jint flags) { _flags = (flags & JVM_ACC_WRITTEN_FLAGS); }
161
162 void set_queued_for_compilation() { atomic_set_bits(JVM_ACC_QUEUED); }
163 void clear_queued_for_compilation() { atomic_clear_bits(JVM_ACC_QUEUED); }
164
165 // Atomic update of flags
166 void atomic_set_bits(jint bits);
167 void atomic_clear_bits(jint bits);
168
169 private:
170 friend class methodOopDesc;
171 friend class Klass;
172 friend class ClassFileParser;
173 // the functions below should only be called on the _access_flags inst var directly,
174 // otherwise they are just changing a copy of the flags
175
176 // attribute flags
177 void set_is_synthetic() { atomic_set_bits(JVM_ACC_SYNTHETIC); }
178
179 // methodOop flags
180 void set_monitor_matching() { atomic_set_bits(JVM_ACC_MONITOR_MATCH); }
181 void set_has_monitor_bytecodes() { atomic_set_bits(JVM_ACC_HAS_MONITOR_BYTECODES); }
182 void set_has_loops() { atomic_set_bits(JVM_ACC_HAS_LOOPS); }
183 void set_loops_flag_init() { atomic_set_bits(JVM_ACC_LOOPS_FLAG_INIT); }
184 void set_not_c1_compilable() { atomic_set_bits(JVM_ACC_NOT_C1_COMPILABLE); }
185 void set_not_c2_compilable() { atomic_set_bits(JVM_ACC_NOT_C2_COMPILABLE); }
186 void set_not_osr_compilable() { atomic_set_bits(JVM_ACC_NOT_OSR_COMPILABLE); }
187 void set_has_linenumber_table() { atomic_set_bits(JVM_ACC_HAS_LINE_NUMBER_TABLE); }
188 void set_has_checked_exceptions() { atomic_set_bits(JVM_ACC_HAS_CHECKED_EXCEPTIONS); }
189 void set_has_jsrs() { atomic_set_bits(JVM_ACC_HAS_JSRS); }
190 void set_is_old() { atomic_set_bits(JVM_ACC_IS_OLD); }
191 void set_is_obsolete() { atomic_set_bits(JVM_ACC_IS_OBSOLETE); }
192 void set_is_prefixed_native() { atomic_set_bits(JVM_ACC_IS_PREFIXED_NATIVE); }
193
194 // klassOop flags
195 void set_has_vanilla_constructor() { atomic_set_bits(JVM_ACC_HAS_VANILLA_CONSTRUCTOR); }
196 void set_has_finalizer() { atomic_set_bits(JVM_ACC_HAS_FINALIZER); }
197 void set_has_final_method() { atomic_set_bits(JVM_ACC_HAS_FINAL_METHOD); }
198 void set_is_cloneable() { atomic_set_bits(JVM_ACC_IS_CLONEABLE); }
199 void set_has_miranda_methods() { atomic_set_bits(JVM_ACC_HAS_MIRANDA_METHODS); }
200
201 public:
202 // field flags
203 void set_is_field_access_watched(const bool value)
204 {
205 if (value) {
206 atomic_set_bits(JVM_ACC_FIELD_ACCESS_WATCHED);
207 } else {
208 atomic_clear_bits(JVM_ACC_FIELD_ACCESS_WATCHED);
209 }
210 }
211 void set_is_field_modification_watched(const bool value)
212 {
213 if (value) {
214 atomic_set_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED);
215 } else {
216 atomic_clear_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED);
217 }
218 }
219
220 // Conversion
221 jshort as_short() { return (jshort)_flags; }
222 jint as_int() { return _flags; }
223
224 inline friend AccessFlags accessFlags_from(jint flags);
225
226 // Printing/debugging
227 void print_on(outputStream* st) const PRODUCT_RETURN;
228 };
229
230 inline AccessFlags accessFlags_from(jint flags) {
231 AccessFlags af;
232 af._flags = flags;
233 return af;
234 }
235
236 #endif // SHARE_VM_UTILITIES_ACCESSFLAGS_HPP