1 /*
2 * Copyright (c) 1997, 2019, 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_UTILITIES_ACCESSFLAGS_HPP
26 #define SHARE_UTILITIES_ACCESSFLAGS_HPP
27
28 #include "jvm.h"
29 #include "utilities/debug.hpp"
30 #include "utilities/macros.hpp"
31
32 // AccessFlags is an abstraction over Java access flags.
33
34 class outputStream;
35
36 enum {
37 // See jvm.h for shared JVM_ACC_XXX access flags
38
39 // HotSpot-specific access flags
40
41 // flags actually put in .class file
42 JVM_ACC_WRITTEN_FLAGS = 0x00007FFF,
43
44 // Method* flags
45 JVM_ACC_MONITOR_MATCH = 0x10000000, // True if we know that monitorenter/monitorexit bytecodes match
46 JVM_ACC_HAS_MONITOR_BYTECODES = 0x20000000, // Method contains monitorenter/monitorexit bytecodes
47 JVM_ACC_HAS_LOOPS = 0x40000000, // Method has loops
48 JVM_ACC_LOOPS_FLAG_INIT = (int)0x80000000,// The loop flag has been initialized
49 JVM_ACC_QUEUED = 0x01000000, // Queued for compilation
50 JVM_ACC_NOT_C2_COMPILABLE = 0x02000000,
51 JVM_ACC_NOT_C1_COMPILABLE = 0x04000000,
52 JVM_ACC_NOT_C2_OSR_COMPILABLE = 0x08000000,
53 JVM_ACC_HAS_LINE_NUMBER_TABLE = 0x00100000,
54 JVM_ACC_HAS_CHECKED_EXCEPTIONS = 0x00400000,
55 JVM_ACC_HAS_JSRS = 0x00800000,
56 JVM_ACC_IS_OLD = 0x00010000, // RedefineClasses() has replaced this method
57 JVM_ACC_IS_OBSOLETE = 0x00020000, // RedefineClasses() has made method obsolete
58 JVM_ACC_IS_PREFIXED_NATIVE = 0x00040000, // JVMTI has prefixed this native method
59 JVM_ACC_ON_STACK = 0x00080000, // RedefineClasses() was used on the stack
60 JVM_ACC_IS_DELETED = 0x00008000, // RedefineClasses() has deleted this method
61
62 // Klass* flags
63 JVM_ACC_HAS_MIRANDA_METHODS = 0x10000000, // True if this class has miranda methods in it's vtable
64 JVM_ACC_HAS_VANILLA_CONSTRUCTOR = 0x20000000, // True if klass has a vanilla default constructor
65 JVM_ACC_HAS_FINALIZER = 0x40000000, // True if klass has a non-empty finalize() method
66 JVM_ACC_IS_CLONEABLE_FAST = (int)0x80000000,// True if klass implements the Cloneable interface and can be optimized in generated code
67 JVM_ACC_HAS_FINAL_METHOD = 0x01000000, // True if klass has final method
68 JVM_ACC_IS_SHARED_CLASS = 0x02000000, // True if klass is shared
69
70 // Klass* and Method* flags
71 JVM_ACC_HAS_LOCAL_VARIABLE_TABLE= 0x00200000,
72
73 JVM_ACC_PROMOTED_FLAGS = 0x00200000, // flags promoted from methods to the holding klass
74
75 // field flags
76 // Note: these flags must be defined in the low order 16 bits because
77 // InstanceKlass only stores a ushort worth of information from the
78 // AccessFlags value.
79 // These bits must not conflict with any other field-related access flags
80 // (e.g., ACC_ENUM).
81 // Note that the class-related ACC_ANNOTATION bit conflicts with these flags.
82 JVM_ACC_FIELD_ACCESS_WATCHED = 0x00002000, // field access is watched by JVMTI
83 JVM_ACC_FIELD_MODIFICATION_WATCHED = 0x00008000, // field modification is watched by JVMTI
84 JVM_ACC_FIELD_INTERNAL = 0x00000400, // internal field, same as JVM_ACC_ABSTRACT
85 JVM_ACC_FIELD_STABLE = 0x00000020, // @Stable field, same as JVM_ACC_SYNCHRONIZED and JVM_ACC_SUPER
86 JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE = 0x00000200, // (static) final field updated outside (class) initializer, same as JVM_ACC_NATIVE
87 JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE = 0x00000800, // field has generic signature
88 /* JVM_ACC_FLATTENABLE = 0x00000100, */ // To be enabled when ACC_FLATTENABLE is removed from java.base
89 JVM_ACC_FIELD_FLATTENED = 0x00008000, // flattened value field
90
91 JVM_ACC_FIELD_INTERNAL_FLAGS = JVM_ACC_FIELD_ACCESS_WATCHED |
92 JVM_ACC_FIELD_MODIFICATION_WATCHED |
93 JVM_ACC_FIELD_INTERNAL |
94 JVM_ACC_FIELD_STABLE |
95 JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE |
96 JVM_ACC_FLATTENABLE |
97 JVM_ACC_FIELD_FLATTENED,
98
99 // flags accepted by set_field_flags()
100 JVM_ACC_FIELD_FLAGS = JVM_RECOGNIZED_FIELD_MODIFIERS | JVM_ACC_FIELD_INTERNAL_FLAGS
101
102 };
103
104
105 class AccessFlags {
106 friend class VMStructs;
107 private:
108 jint _flags;
109
110 public:
111 AccessFlags() : _flags(0) {}
112 explicit AccessFlags(jint flags) : _flags(flags) {}
113
114 // Java access flags
115 bool is_public () const { return (_flags & JVM_ACC_PUBLIC ) != 0; }
116 bool is_private () const { return (_flags & JVM_ACC_PRIVATE ) != 0; }
117 bool is_protected () const { return (_flags & JVM_ACC_PROTECTED ) != 0; }
118 bool is_static () const { return (_flags & JVM_ACC_STATIC ) != 0; }
119 bool is_final () const { return (_flags & JVM_ACC_FINAL ) != 0; }
120 bool is_synchronized() const { return (_flags & JVM_ACC_SYNCHRONIZED) != 0; }
121 bool is_super () const { return (_flags & JVM_ACC_SUPER ) != 0; }
122 bool is_volatile () const { return (_flags & JVM_ACC_VOLATILE ) != 0; }
123 bool is_transient () const { return (_flags & JVM_ACC_TRANSIENT ) != 0; }
124 bool is_native () const { return (_flags & JVM_ACC_NATIVE ) != 0; }
125 bool is_interface () const { return (_flags & JVM_ACC_INTERFACE ) != 0; }
126 bool is_abstract () const { return (_flags & JVM_ACC_ABSTRACT ) != 0; }
127 bool is_strict () const { return (_flags & JVM_ACC_STRICT ) != 0; }
128 bool is_value_type () const { return (_flags & JVM_ACC_VALUE ) != 0; }
129 bool is_flattenable () const { return (_flags & JVM_ACC_FLATTENABLE ) != 0; }
130
131 // Attribute flags
132 bool is_synthetic () const { return (_flags & JVM_ACC_SYNTHETIC ) != 0; }
133
134 // Method* flags
135 bool is_monitor_matching () const { return (_flags & JVM_ACC_MONITOR_MATCH ) != 0; }
136 bool has_monitor_bytecodes () const { return (_flags & JVM_ACC_HAS_MONITOR_BYTECODES ) != 0; }
137 bool has_loops () const { return (_flags & JVM_ACC_HAS_LOOPS ) != 0; }
138 bool loops_flag_init () const { return (_flags & JVM_ACC_LOOPS_FLAG_INIT ) != 0; }
139 bool queued_for_compilation () const { return (_flags & JVM_ACC_QUEUED ) != 0; }
140 bool is_not_c1_compilable () const { return (_flags & JVM_ACC_NOT_C1_COMPILABLE ) != 0; }
141 bool is_not_c2_compilable () const { return (_flags & JVM_ACC_NOT_C2_COMPILABLE ) != 0; }
142 bool is_not_c2_osr_compilable() const { return (_flags & JVM_ACC_NOT_C2_OSR_COMPILABLE ) != 0; }
143 bool has_linenumber_table () const { return (_flags & JVM_ACC_HAS_LINE_NUMBER_TABLE ) != 0; }
144 bool has_checked_exceptions () const { return (_flags & JVM_ACC_HAS_CHECKED_EXCEPTIONS ) != 0; }
145 bool has_jsrs () const { return (_flags & JVM_ACC_HAS_JSRS ) != 0; }
146 bool is_old () const { return (_flags & JVM_ACC_IS_OLD ) != 0; }
147 bool is_obsolete () const { return (_flags & JVM_ACC_IS_OBSOLETE ) != 0; }
148 bool is_deleted () const { return (_flags & JVM_ACC_IS_DELETED ) != 0; }
149 bool is_prefixed_native () const { return (_flags & JVM_ACC_IS_PREFIXED_NATIVE ) != 0; }
150
151 // Klass* flags
152 bool has_miranda_methods () const { return (_flags & JVM_ACC_HAS_MIRANDA_METHODS ) != 0; }
153 bool has_vanilla_constructor () const { return (_flags & JVM_ACC_HAS_VANILLA_CONSTRUCTOR) != 0; }
154 bool has_finalizer () const { return (_flags & JVM_ACC_HAS_FINALIZER ) != 0; }
155 bool has_final_method () const { return (_flags & JVM_ACC_HAS_FINAL_METHOD ) != 0; }
156 bool is_cloneable_fast () const { return (_flags & JVM_ACC_IS_CLONEABLE_FAST ) != 0; }
157 bool is_shared_class () const { return (_flags & JVM_ACC_IS_SHARED_CLASS ) != 0; }
158
159 // Klass* and Method* flags
160 bool has_localvariable_table () const { return (_flags & JVM_ACC_HAS_LOCAL_VARIABLE_TABLE) != 0; }
161 void set_has_localvariable_table() { atomic_set_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); }
162 void clear_has_localvariable_table() { atomic_clear_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); }
163
164 // field flags
165 bool is_field_access_watched() const { return (_flags & JVM_ACC_FIELD_ACCESS_WATCHED) != 0; }
166 bool is_field_modification_watched() const
167 { return (_flags & JVM_ACC_FIELD_MODIFICATION_WATCHED) != 0; }
168 bool has_field_initialized_final_update() const
169 { return (_flags & JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE) != 0; }
170 bool on_stack() const { return (_flags & JVM_ACC_ON_STACK) != 0; }
171 bool is_internal() const { return (_flags & JVM_ACC_FIELD_INTERNAL) != 0; }
172 bool is_stable() const { return (_flags & JVM_ACC_FIELD_STABLE) != 0; }
173 bool field_has_generic_signature() const
174 { return (_flags & JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE) != 0; }
175
176 // get .class file flags
177 jint get_flags () const { return (_flags & JVM_ACC_WRITTEN_FLAGS); }
178
179 // Initialization
180 void add_promoted_flags(jint flags) { _flags |= (flags & JVM_ACC_PROMOTED_FLAGS); }
181 void set_field_flags(jint flags) {
182 assert((flags & JVM_ACC_FIELD_FLAGS) == flags, "only recognized flags");
183 _flags = (flags & JVM_ACC_FIELD_FLAGS);
184 }
185 void set_flags(jint flags) { _flags = (flags & JVM_ACC_WRITTEN_FLAGS); }
186
187 void set_queued_for_compilation() { atomic_set_bits(JVM_ACC_QUEUED); }
188 void clear_queued_for_compilation() { atomic_clear_bits(JVM_ACC_QUEUED); }
189
190 // Atomic update of flags
191 void atomic_set_bits(jint bits);
192 void atomic_clear_bits(jint bits);
193
194 private:
195 friend class Method;
196 friend class Klass;
197 friend class ClassFileParser;
198 // the functions below should only be called on the _access_flags inst var directly,
199 // otherwise they are just changing a copy of the flags
200
201 // attribute flags
202 void set_is_synthetic() { atomic_set_bits(JVM_ACC_SYNTHETIC); }
203
204 // Method* flags
205 void set_monitor_matching() { atomic_set_bits(JVM_ACC_MONITOR_MATCH); }
206 void set_has_monitor_bytecodes() { atomic_set_bits(JVM_ACC_HAS_MONITOR_BYTECODES); }
207 void set_has_loops() { atomic_set_bits(JVM_ACC_HAS_LOOPS); }
208 void set_loops_flag_init() { atomic_set_bits(JVM_ACC_LOOPS_FLAG_INIT); }
209 void set_not_c1_compilable() { atomic_set_bits(JVM_ACC_NOT_C1_COMPILABLE); }
210 void set_not_c2_compilable() { atomic_set_bits(JVM_ACC_NOT_C2_COMPILABLE); }
211 void set_not_c2_osr_compilable() { atomic_set_bits(JVM_ACC_NOT_C2_OSR_COMPILABLE); }
212 void set_has_linenumber_table() { atomic_set_bits(JVM_ACC_HAS_LINE_NUMBER_TABLE); }
213 void set_has_checked_exceptions() { atomic_set_bits(JVM_ACC_HAS_CHECKED_EXCEPTIONS); }
214 void set_has_jsrs() { atomic_set_bits(JVM_ACC_HAS_JSRS); }
215 void set_is_old() { atomic_set_bits(JVM_ACC_IS_OLD); }
216 void set_is_obsolete() { atomic_set_bits(JVM_ACC_IS_OBSOLETE); }
217 void set_is_deleted() { atomic_set_bits(JVM_ACC_IS_DELETED); }
218 void set_is_prefixed_native() { atomic_set_bits(JVM_ACC_IS_PREFIXED_NATIVE); }
219 void set_is_flattenable() { atomic_set_bits(JVM_ACC_FLATTENABLE); }
220
221 void clear_not_c1_compilable() { atomic_clear_bits(JVM_ACC_NOT_C1_COMPILABLE); }
222 void clear_not_c2_compilable() { atomic_clear_bits(JVM_ACC_NOT_C2_COMPILABLE); }
223 void clear_not_c2_osr_compilable() { atomic_clear_bits(JVM_ACC_NOT_C2_OSR_COMPILABLE); }
224 // Klass* flags
225 void set_has_vanilla_constructor() { atomic_set_bits(JVM_ACC_HAS_VANILLA_CONSTRUCTOR); }
226 void set_has_finalizer() { atomic_set_bits(JVM_ACC_HAS_FINALIZER); }
227 void set_has_final_method() { atomic_set_bits(JVM_ACC_HAS_FINAL_METHOD); }
228 void set_is_cloneable_fast() { atomic_set_bits(JVM_ACC_IS_CLONEABLE_FAST); }
229 void set_has_miranda_methods() { atomic_set_bits(JVM_ACC_HAS_MIRANDA_METHODS); }
230 void set_is_shared_class() { atomic_set_bits(JVM_ACC_IS_SHARED_CLASS); }
231
232 public:
233 // field flags
234 void set_is_field_access_watched(const bool value)
235 {
236 if (value) {
237 atomic_set_bits(JVM_ACC_FIELD_ACCESS_WATCHED);
238 } else {
239 atomic_clear_bits(JVM_ACC_FIELD_ACCESS_WATCHED);
240 }
241 }
242 void set_is_field_modification_watched(const bool value)
243 {
244 if (value) {
245 atomic_set_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED);
246 } else {
247 atomic_clear_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED);
248 }
249 }
250
251 void set_has_field_initialized_final_update(const bool value) {
252 if (value) {
253 atomic_set_bits(JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE);
254 } else {
255 atomic_clear_bits(JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE);
256 }
257 }
258
259 void set_field_has_generic_signature()
260 {
261 atomic_set_bits(JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE);
262 }
263
264 void set_on_stack(const bool value)
265 {
266 if (value) {
267 atomic_set_bits(JVM_ACC_ON_STACK);
268 } else {
269 atomic_clear_bits(JVM_ACC_ON_STACK);
270 }
271 }
272 // Conversion
273 jshort as_short() const { return (jshort)_flags; }
274 jint as_int() const { return _flags; }
275
276 inline friend AccessFlags accessFlags_from(jint flags);
277
278 // Printing/debugging
279 #if INCLUDE_JVMTI
280 void print_on(outputStream* st) const;
281 #else
282 void print_on(outputStream* st) const PRODUCT_RETURN;
283 #endif
284 };
285
286 inline AccessFlags accessFlags_from(jint flags) {
287 AccessFlags af;
288 af._flags = flags;
289 return af;
290 }
291
292 #endif // SHARE_UTILITIES_ACCESSFLAGS_HPP