1 /* 2 * Copyright (c) 1997, 2015, 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_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 // Method* 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_C2_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 JVM_ACC_ON_STACK = 0x00080000, // RedefineClasses() was used on the stack 58 JVM_ACC_IS_DELETED = 0x00008000, // RedefineClasses() has deleted this method 59 60 // Klass* flags 61 JVM_ACC_HAS_MIRANDA_METHODS = 0x10000000, // True if this class has miranda methods in it's vtable 62 JVM_ACC_HAS_VANILLA_CONSTRUCTOR = 0x20000000, // True if klass has a vanilla default constructor 63 JVM_ACC_HAS_FINALIZER = 0x40000000, // True if klass has a non-empty finalize() method 64 JVM_ACC_IS_CLONEABLE = (int)0x80000000,// True if klass supports the Clonable interface 65 JVM_ACC_HAS_FINAL_METHOD = 0x01000000, // True if klass has final method 66 67 // Klass* and Method* flags 68 JVM_ACC_HAS_LOCAL_VARIABLE_TABLE= 0x00200000, 69 70 JVM_ACC_PROMOTED_FLAGS = 0x00200000, // flags promoted from methods to the holding klass 71 72 // field flags 73 // Note: these flags must be defined in the low order 16 bits because 74 // InstanceKlass only stores a ushort worth of information from the 75 // AccessFlags value. 76 // These bits must not conflict with any other field-related access flags 77 // (e.g., ACC_ENUM). 78 // Note that the class-related ACC_ANNOTATION bit conflicts with these flags. 79 JVM_ACC_FIELD_ACCESS_WATCHED = 0x00002000, // field access is watched by JVMTI 80 JVM_ACC_FIELD_MODIFICATION_WATCHED = 0x00008000, // field modification is watched by JVMTI 81 JVM_ACC_FIELD_INTERNAL = 0x00000400, // internal field, same as JVM_ACC_ABSTRACT 82 JVM_ACC_FIELD_STABLE = 0x00000020, // @Stable field, same as JVM_ACC_SYNCHRONIZED and JVM_ACC_SUPER 83 JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE = 0x00000100, // (static) final field updated outside (class) initializer, same as JVM_ACC_NATIVE 84 JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE = 0x00000800, // field has generic signature 85 86 JVM_ACC_FIELD_INTERNAL_FLAGS = JVM_ACC_FIELD_ACCESS_WATCHED | 87 JVM_ACC_FIELD_MODIFICATION_WATCHED | 88 JVM_ACC_FIELD_INTERNAL | 89 JVM_ACC_FIELD_STABLE | 90 JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE, 91 92 // flags accepted by set_field_flags() 93 JVM_ACC_FIELD_FLAGS = JVM_RECOGNIZED_FIELD_MODIFIERS | JVM_ACC_FIELD_INTERNAL_FLAGS 94 95 }; 96 97 98 class AccessFlags VALUE_OBJ_CLASS_SPEC { 99 friend class VMStructs; 100 private: 101 jint _flags; 102 103 public: 104 // Java access flags 105 bool is_public () const { return (_flags & JVM_ACC_PUBLIC ) != 0; } 106 bool is_private () const { return (_flags & JVM_ACC_PRIVATE ) != 0; } 107 bool is_protected () const { return (_flags & JVM_ACC_PROTECTED ) != 0; } 108 bool is_static () const { return (_flags & JVM_ACC_STATIC ) != 0; } 109 bool is_final () const { return (_flags & JVM_ACC_FINAL ) != 0; } 110 bool is_synchronized() const { return (_flags & JVM_ACC_SYNCHRONIZED) != 0; } 111 bool is_super () const { return (_flags & JVM_ACC_SUPER ) != 0; } 112 bool is_volatile () const { return (_flags & JVM_ACC_VOLATILE ) != 0; } 113 bool is_transient () const { return (_flags & JVM_ACC_TRANSIENT ) != 0; } 114 bool is_native () const { return (_flags & JVM_ACC_NATIVE ) != 0; } 115 bool is_interface () const { return (_flags & JVM_ACC_INTERFACE ) != 0; } 116 bool is_abstract () const { return (_flags & JVM_ACC_ABSTRACT ) != 0; } 117 bool is_strict () const { return (_flags & JVM_ACC_STRICT ) != 0; } 118 119 // Attribute flags 120 bool is_synthetic () const { return (_flags & JVM_ACC_SYNTHETIC ) != 0; } 121 122 // Method* flags 123 bool is_monitor_matching () const { return (_flags & JVM_ACC_MONITOR_MATCH ) != 0; } 124 bool has_monitor_bytecodes () const { return (_flags & JVM_ACC_HAS_MONITOR_BYTECODES ) != 0; } 125 bool has_loops () const { return (_flags & JVM_ACC_HAS_LOOPS ) != 0; } 126 bool loops_flag_init () const { return (_flags & JVM_ACC_LOOPS_FLAG_INIT ) != 0; } 127 bool queued_for_compilation () const { return (_flags & JVM_ACC_QUEUED ) != 0; } 128 bool is_not_c1_compilable () const { return (_flags & JVM_ACC_NOT_C1_COMPILABLE ) != 0; } 129 bool is_not_c2_compilable () const { return (_flags & JVM_ACC_NOT_C2_COMPILABLE ) != 0; } 130 bool is_not_c2_osr_compilable() const { return (_flags & JVM_ACC_NOT_C2_OSR_COMPILABLE ) != 0; } 131 bool has_linenumber_table () const { return (_flags & JVM_ACC_HAS_LINE_NUMBER_TABLE ) != 0; } 132 bool has_checked_exceptions () const { return (_flags & JVM_ACC_HAS_CHECKED_EXCEPTIONS ) != 0; } 133 bool has_jsrs () const { return (_flags & JVM_ACC_HAS_JSRS ) != 0; } 134 bool is_old () const { return (_flags & JVM_ACC_IS_OLD ) != 0; } 135 bool is_obsolete () const { return (_flags & JVM_ACC_IS_OBSOLETE ) != 0; } 136 bool is_deleted () const { return (_flags & JVM_ACC_IS_DELETED ) != 0; } 137 bool is_prefixed_native () const { return (_flags & JVM_ACC_IS_PREFIXED_NATIVE ) != 0; } 138 139 // Klass* flags 140 bool has_miranda_methods () const { return (_flags & JVM_ACC_HAS_MIRANDA_METHODS ) != 0; } 141 bool has_vanilla_constructor () const { return (_flags & JVM_ACC_HAS_VANILLA_CONSTRUCTOR) != 0; } 142 bool has_finalizer () const { return (_flags & JVM_ACC_HAS_FINALIZER ) != 0; } 143 bool has_final_method () const { return (_flags & JVM_ACC_HAS_FINAL_METHOD ) != 0; } 144 bool is_cloneable () const { return (_flags & JVM_ACC_IS_CLONEABLE ) != 0; } 145 // Klass* and Method* flags 146 bool has_localvariable_table () const { return (_flags & JVM_ACC_HAS_LOCAL_VARIABLE_TABLE) != 0; } 147 void set_has_localvariable_table() { atomic_set_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); } 148 void clear_has_localvariable_table() { atomic_clear_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); } 149 150 // field flags 151 bool is_field_access_watched() const { return (_flags & JVM_ACC_FIELD_ACCESS_WATCHED) != 0; } 152 bool is_field_modification_watched() const 153 { return (_flags & JVM_ACC_FIELD_MODIFICATION_WATCHED) != 0; } 154 bool has_field_initialized_final_update() const 155 { return (_flags & JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE) != 0; } 156 bool on_stack() const { return (_flags & JVM_ACC_ON_STACK) != 0; } 157 bool is_internal() const { return (_flags & JVM_ACC_FIELD_INTERNAL) != 0; } 158 bool is_stable() const { return (_flags & JVM_ACC_FIELD_STABLE) != 0; } 159 bool field_has_generic_signature() const 160 { return (_flags & JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE) != 0; } 161 162 // get .class file flags 163 jint get_flags () const { return (_flags & JVM_ACC_WRITTEN_FLAGS); } 164 165 // Initialization 166 void add_promoted_flags(jint flags) { _flags |= (flags & JVM_ACC_PROMOTED_FLAGS); } 167 void set_field_flags(jint flags) { 168 assert((flags & JVM_ACC_FIELD_FLAGS) == flags, "only recognized flags"); 169 _flags = (flags & JVM_ACC_FIELD_FLAGS); 170 } 171 void set_flags(jint flags) { _flags = (flags & JVM_ACC_WRITTEN_FLAGS); } 172 173 void set_queued_for_compilation() { atomic_set_bits(JVM_ACC_QUEUED); } 174 void clear_queued_for_compilation() { atomic_clear_bits(JVM_ACC_QUEUED); } 175 176 // Atomic update of flags 177 void atomic_set_bits(jint bits); 178 bool atomic_set_one_bit(jint bit); 179 void atomic_clear_bits(jint bits); 180 181 private: 182 friend class Method; 183 friend class Klass; 184 friend class ClassFileParser; 185 // the functions below should only be called on the _access_flags inst var directly, 186 // otherwise they are just changing a copy of the flags 187 188 // attribute flags 189 void set_is_synthetic() { atomic_set_bits(JVM_ACC_SYNTHETIC); } 190 191 // Method* flags 192 void set_monitor_matching() { atomic_set_bits(JVM_ACC_MONITOR_MATCH); } 193 void set_has_monitor_bytecodes() { atomic_set_bits(JVM_ACC_HAS_MONITOR_BYTECODES); } 194 void set_has_loops() { atomic_set_bits(JVM_ACC_HAS_LOOPS); } 195 void set_loops_flag_init() { atomic_set_bits(JVM_ACC_LOOPS_FLAG_INIT); } 196 void set_not_c1_compilable() { atomic_set_bits(JVM_ACC_NOT_C1_COMPILABLE); } 197 void set_not_c2_compilable() { atomic_set_bits(JVM_ACC_NOT_C2_COMPILABLE); } 198 void set_not_c2_osr_compilable() { atomic_set_bits(JVM_ACC_NOT_C2_OSR_COMPILABLE); } 199 void set_has_linenumber_table() { atomic_set_bits(JVM_ACC_HAS_LINE_NUMBER_TABLE); } 200 void set_has_checked_exceptions() { atomic_set_bits(JVM_ACC_HAS_CHECKED_EXCEPTIONS); } 201 void set_has_jsrs() { atomic_set_bits(JVM_ACC_HAS_JSRS); } 202 void set_is_old() { atomic_set_bits(JVM_ACC_IS_OLD); } 203 void set_is_obsolete() { atomic_set_bits(JVM_ACC_IS_OBSOLETE); } 204 void set_is_deleted() { atomic_set_bits(JVM_ACC_IS_DELETED); } 205 void set_is_prefixed_native() { atomic_set_bits(JVM_ACC_IS_PREFIXED_NATIVE); } 206 207 void clear_not_c1_compilable() { atomic_clear_bits(JVM_ACC_NOT_C1_COMPILABLE); } 208 void clear_not_c2_compilable() { atomic_clear_bits(JVM_ACC_NOT_C2_COMPILABLE); } 209 void clear_not_c2_osr_compilable() { atomic_clear_bits(JVM_ACC_NOT_C2_OSR_COMPILABLE); } 210 // Klass* flags 211 void set_has_vanilla_constructor() { atomic_set_bits(JVM_ACC_HAS_VANILLA_CONSTRUCTOR); } 212 void set_has_finalizer() { atomic_set_bits(JVM_ACC_HAS_FINALIZER); } 213 void set_has_final_method() { atomic_set_bits(JVM_ACC_HAS_FINAL_METHOD); } 214 void set_is_cloneable() { atomic_set_bits(JVM_ACC_IS_CLONEABLE); } 215 void set_has_miranda_methods() { atomic_set_bits(JVM_ACC_HAS_MIRANDA_METHODS); } 216 217 public: 218 // field flags 219 void set_is_field_access_watched(const bool value) 220 { 221 if (value) { 222 atomic_set_bits(JVM_ACC_FIELD_ACCESS_WATCHED); 223 } else { 224 atomic_clear_bits(JVM_ACC_FIELD_ACCESS_WATCHED); 225 } 226 } 227 void set_is_field_modification_watched(const bool value) 228 { 229 if (value) { 230 atomic_set_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED); 231 } else { 232 atomic_clear_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED); 233 } 234 } 235 236 void set_has_field_initialized_final_update(const bool value) { 237 if (value) { 238 atomic_set_bits(JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE); 239 } else { 240 atomic_clear_bits(JVM_ACC_FIELD_INITIALIZED_FINAL_UPDATE); 241 } 242 } 243 244 void set_field_has_generic_signature() 245 { 246 atomic_set_bits(JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE); 247 } 248 249 bool set_on_stack(const bool value) 250 { 251 if (value) { 252 return atomic_set_one_bit(JVM_ACC_ON_STACK); 253 } else { 254 atomic_clear_bits(JVM_ACC_ON_STACK); 255 return true; // Ignored 256 } 257 } 258 // Conversion 259 jshort as_short() const { return (jshort)_flags; } 260 jint as_int() const { return _flags; } 261 262 inline friend AccessFlags accessFlags_from(jint flags); 263 264 // Printing/debugging 265 #if INCLUDE_JVMTI 266 void print_on(outputStream* st) const; 267 #else 268 void print_on(outputStream* st) const PRODUCT_RETURN; 269 #endif 270 }; 271 272 inline AccessFlags accessFlags_from(jint flags) { 273 AccessFlags af; 274 af._flags = flags; 275 return af; 276 } 277 278 #endif // SHARE_VM_UTILITIES_ACCESSFLAGS_HPP