accessFlags.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1997, 2009, 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// AccessFlags is an abstraction over Java access flags. 26 27 28enum { 29 // See jvm.h for shared JVM_ACC_XXX access flags 30 31 // HotSpot-specific access flags 32 33 // flags actually put in .class file 34 JVM_ACC_WRITTEN_FLAGS = 0x00007FFF, 35 36 // methodOop flags 37 JVM_ACC_MONITOR_MATCH = 0x10000000, // True if we know that monitorenter/monitorexit bytecodes match 38 JVM_ACC_HAS_MONITOR_BYTECODES = 0x20000000, // Method contains monitorenter/monitorexit bytecodes 39 JVM_ACC_HAS_LOOPS = 0x40000000, // Method has loops 40 JVM_ACC_LOOPS_FLAG_INIT = (int)0x80000000,// The loop flag has been initialized 41 JVM_ACC_QUEUED = 0x01000000, // Queued for compilation 42 JVM_ACC_NOT_TIER1_COMPILABLE = 0x04000000, 43 JVM_ACC_NOT_OSR_COMPILABLE = 0x08000000, 44 JVM_ACC_HAS_LINE_NUMBER_TABLE = 0x00100000, 45 JVM_ACC_HAS_CHECKED_EXCEPTIONS = 0x00400000, 46 JVM_ACC_HAS_JSRS = 0x00800000, 47 JVM_ACC_IS_OLD = 0x00010000, // RedefineClasses() has replaced this method 48 JVM_ACC_IS_OBSOLETE = 0x00020000, // RedefineClasses() has made method obsolete 49 JVM_ACC_IS_PREFIXED_NATIVE = 0x00040000, // JVMTI has prefixed this native method 50 JVM_MH_INVOKE_BITS // = 0x10001100 // MethodHandle.invoke quasi-native 51 = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_MONITOR_MATCH), 52 53 // klassOop flags 54 JVM_ACC_HAS_MIRANDA_METHODS = 0x10000000, // True if this class has miranda methods in it's vtable 55 JVM_ACC_HAS_VANILLA_CONSTRUCTOR = 0x20000000, // True if klass has a vanilla default constructor 56 JVM_ACC_HAS_FINALIZER = 0x40000000, // True if klass has a non-empty finalize() method 57 JVM_ACC_IS_CLONEABLE = (int)0x80000000,// True if klass supports the Clonable interface 58 JVM_ACC_HAS_FINAL_METHOD = 0x01000000, // True if klass has final method 59 60 // klassOop and methodOop flags 61 JVM_ACC_HAS_LOCAL_VARIABLE_TABLE= 0x00200000, 62 63 JVM_ACC_PROMOTED_FLAGS = 0x00200000, // flags promoted from methods to the holding klass 64 65 // field flags 66 // Note: these flags must be defined in the low order 16 bits because 67 // instanceKlass only stores a ushort worth of information from the 68 // AccessFlags value. 69 // These bits must not conflict with any other field-related access flags 70 // (e.g., ACC_ENUM). 71 // Note that the class-related ACC_ANNOTATION bit conflicts with these flags. 72 JVM_ACC_FIELD_ACCESS_WATCHED = 0x00002000, // field access is watched by JVMTI 73 JVM_ACC_FIELD_MODIFICATION_WATCHED = 0x00008000, // field modification is watched by JVMTI 74 75 // flags accepted by set_field_flags() 76 JVM_ACC_FIELD_FLAGS = 0x00008000 | JVM_ACC_WRITTEN_FLAGS 77 78}; 79 80 81class AccessFlags VALUE_OBJ_CLASS_SPEC { 82 friend class VMStructs; 83 private: 84 jint _flags; 85 86 public: 87 // Java access flags 88 bool is_public () const { return (_flags & JVM_ACC_PUBLIC ) != 0; } 89 bool is_private () const { return (_flags & JVM_ACC_PRIVATE ) != 0; } 90 bool is_protected () const { return (_flags & JVM_ACC_PROTECTED ) != 0; } 91 bool is_static () const { return (_flags & JVM_ACC_STATIC ) != 0; } 92 bool is_final () const { return (_flags & JVM_ACC_FINAL ) != 0; } 93 bool is_synchronized() const { return (_flags & JVM_ACC_SYNCHRONIZED) != 0; } 94 bool is_super () const { return (_flags & JVM_ACC_SUPER ) != 0; } 95 bool is_volatile () const { return (_flags & JVM_ACC_VOLATILE ) != 0; } 96 bool is_transient () const { return (_flags & JVM_ACC_TRANSIENT ) != 0; } 97 bool is_native () const { return (_flags & JVM_ACC_NATIVE ) != 0; } 98 bool is_interface () const { return (_flags & JVM_ACC_INTERFACE ) != 0; } 99 bool is_abstract () const { return (_flags & JVM_ACC_ABSTRACT ) != 0; } 100 bool is_strict () const { return (_flags & JVM_ACC_STRICT ) != 0; } 101 102 // Attribute flags 103 bool is_synthetic () const { return (_flags & JVM_ACC_SYNTHETIC ) != 0; } 104 105 // methodOop flags 106 bool is_monitor_matching () const { return (_flags & JVM_ACC_MONITOR_MATCH ) != 0; } 107 bool has_monitor_bytecodes () const { return (_flags & JVM_ACC_HAS_MONITOR_BYTECODES ) != 0; } 108 bool has_loops () const { return (_flags & JVM_ACC_HAS_LOOPS ) != 0; } 109 bool loops_flag_init () const { return (_flags & JVM_ACC_LOOPS_FLAG_INIT ) != 0; } 110 bool queued_for_compilation () const { return (_flags & JVM_ACC_QUEUED ) != 0; } 111 bool is_not_tier1_compilable () const { return (_flags & JVM_ACC_NOT_TIER1_COMPILABLE ) != 0; } 112 bool is_not_osr_compilable () const { return (_flags & JVM_ACC_NOT_OSR_COMPILABLE ) != 0; } 113 bool has_linenumber_table () const { return (_flags & JVM_ACC_HAS_LINE_NUMBER_TABLE ) != 0; } 114 bool has_checked_exceptions () const { return (_flags & JVM_ACC_HAS_CHECKED_EXCEPTIONS ) != 0; } 115 bool has_jsrs () const { return (_flags & JVM_ACC_HAS_JSRS ) != 0; } 116 bool is_old () const { return (_flags & JVM_ACC_IS_OLD ) != 0; } 117 bool is_obsolete () const { return (_flags & JVM_ACC_IS_OBSOLETE ) != 0; } 118 bool is_prefixed_native () const { return (_flags & JVM_ACC_IS_PREFIXED_NATIVE ) != 0; } 119 120 // JSR 292: A method of the form MethodHandle.invoke(A...)R method is 121 // neither bytecoded nor a JNI native, but rather a fast call through 122 // a lightweight method handle object. Because it is not bytecoded, 123 // it has the native bit set, but the monitor-match bit is also set 124 // to distinguish it from a JNI native (which never has the match bit set). 125 // The synthetic bit is also present, because such a method is never 126 // explicitly defined in Java code. 127 bool is_method_handle_invoke () const { return (_flags & JVM_MH_INVOKE_BITS) == JVM_MH_INVOKE_BITS; } 128 129 // klassOop flags 130 bool has_miranda_methods () const { return (_flags & JVM_ACC_HAS_MIRANDA_METHODS ) != 0; } 131 bool has_vanilla_constructor () const { return (_flags & JVM_ACC_HAS_VANILLA_CONSTRUCTOR) != 0; } 132 bool has_finalizer () const { return (_flags & JVM_ACC_HAS_FINALIZER ) != 0; } 133 bool has_final_method () const { return (_flags & JVM_ACC_HAS_FINAL_METHOD ) != 0; } 134 bool is_cloneable () const { return (_flags & JVM_ACC_IS_CLONEABLE ) != 0; } 135 // klassOop and methodOop flags 136 bool has_localvariable_table () const { return (_flags & JVM_ACC_HAS_LOCAL_VARIABLE_TABLE) != 0; } 137 void set_has_localvariable_table() { atomic_set_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); } 138 void clear_has_localvariable_table() { atomic_clear_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); } 139 140 // field flags 141 bool is_field_access_watched() const { return (_flags & JVM_ACC_FIELD_ACCESS_WATCHED) != 0; } 142 bool is_field_modification_watched() const 143 { return (_flags & JVM_ACC_FIELD_MODIFICATION_WATCHED) != 0; } 144 145 // get .class file flags 146 jint get_flags () const { return (_flags & JVM_ACC_WRITTEN_FLAGS); } 147 148 // Initialization 149 void add_promoted_flags(jint flags) { _flags |= (flags & JVM_ACC_PROMOTED_FLAGS); } 150 void set_field_flags(jint flags) { _flags = (flags & JVM_ACC_FIELD_FLAGS); } 151 void set_flags(jint flags) { _flags = (flags & JVM_ACC_WRITTEN_FLAGS); } 152 153 void set_queued_for_compilation() { atomic_set_bits(JVM_ACC_QUEUED); } 154 void clear_queued_for_compilation() { atomic_clear_bits(JVM_ACC_QUEUED); } 155 156 // Atomic update of flags 157 void atomic_set_bits(jint bits); 158 void atomic_clear_bits(jint bits); 159 160 private: 161 friend class methodOopDesc; 162 friend class Klass; 163 friend class ClassFileParser; 164 // the functions below should only be called on the _access_flags inst var directly, 165 // otherwise they are just changing a copy of the flags 166 167 // attribute flags 168 void set_is_synthetic() { atomic_set_bits(JVM_ACC_SYNTHETIC); } 169 170 // methodOop flags 171 void set_monitor_matching() { atomic_set_bits(JVM_ACC_MONITOR_MATCH); } 172 void set_has_monitor_bytecodes() { atomic_set_bits(JVM_ACC_HAS_MONITOR_BYTECODES); } 173 void set_has_loops() { atomic_set_bits(JVM_ACC_HAS_LOOPS); } 174 void set_loops_flag_init() { atomic_set_bits(JVM_ACC_LOOPS_FLAG_INIT); } 175 void set_not_tier1_compilable() { atomic_set_bits(JVM_ACC_NOT_TIER1_COMPILABLE); } 176 void set_not_osr_compilable() { atomic_set_bits(JVM_ACC_NOT_OSR_COMPILABLE); } 177 void set_has_linenumber_table() { atomic_set_bits(JVM_ACC_HAS_LINE_NUMBER_TABLE); } 178 void set_has_checked_exceptions() { atomic_set_bits(JVM_ACC_HAS_CHECKED_EXCEPTIONS); } 179 void set_has_jsrs() { atomic_set_bits(JVM_ACC_HAS_JSRS); } 180 void set_is_old() { atomic_set_bits(JVM_ACC_IS_OLD); } 181 void set_is_obsolete() { atomic_set_bits(JVM_ACC_IS_OBSOLETE); } 182 void set_is_prefixed_native() { atomic_set_bits(JVM_ACC_IS_PREFIXED_NATIVE); } 183 184 // klassOop flags 185 void set_has_vanilla_constructor() { atomic_set_bits(JVM_ACC_HAS_VANILLA_CONSTRUCTOR); } 186 void set_has_finalizer() { atomic_set_bits(JVM_ACC_HAS_FINALIZER); } 187 void set_has_final_method() { atomic_set_bits(JVM_ACC_HAS_FINAL_METHOD); } 188 void set_is_cloneable() { atomic_set_bits(JVM_ACC_IS_CLONEABLE); } 189 void set_has_miranda_methods() { atomic_set_bits(JVM_ACC_HAS_MIRANDA_METHODS); } 190 191 public: 192 // field flags 193 void set_is_field_access_watched(const bool value) 194 { 195 if (value) { 196 atomic_set_bits(JVM_ACC_FIELD_ACCESS_WATCHED); 197 } else { 198 atomic_clear_bits(JVM_ACC_FIELD_ACCESS_WATCHED); 199 } 200 } 201 void set_is_field_modification_watched(const bool value) 202 { 203 if (value) { 204 atomic_set_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED); 205 } else { 206 atomic_clear_bits(JVM_ACC_FIELD_MODIFICATION_WATCHED); 207 } 208 } 209 210 // Conversion 211 jshort as_short() { return (jshort)_flags; } 212 jint as_int() { return _flags; } 213 214 inline friend AccessFlags accessFlags_from(jint flags); 215 216 // Printing/debugging 217 void print_on(outputStream* st) const PRODUCT_RETURN; 218}; 219 220inline AccessFlags accessFlags_from(jint flags) { 221 AccessFlags af; 222 af._flags = flags; 223 return af; 224} 225