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