1 /* 2 * Copyright (c) 1997, 2013, 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_RUNTIME_FIELDDESCRIPTOR_HPP 26 #define SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP 27 28 #include "oops/constantPool.hpp" 29 #include "oops/symbol.hpp" 30 #include "runtime/fieldType.hpp" 31 #include "utilities/accessFlags.hpp" 32 #include "utilities/constantTag.hpp" 33 34 // A fieldDescriptor describes the attributes of a single field (instance or class variable). 35 // It needs the class constant pool to work (because it only holds indices into the pool 36 // rather than the actual info). 37 38 class fieldDescriptor VALUE_OBJ_CLASS_SPEC { 39 private: 40 AccessFlags _access_flags; 41 int _index; // the field index 42 constantPoolHandle _cp; 43 u2 _putAccessor; 44 u2 _getAccessor; 45 bool _is_accessor; 46 u2 _field_name_from_accessor; 47 FieldInfo* _accessor_info; 48 Symbol* _sig_for_accessor; 49 50 51 // update the access_flags for the field in the klass 52 void update_klass_field_access_flag() { 53 InstanceKlass* ik = field_holder(); 54 ik->field(index())->set_access_flags(_access_flags.as_short()); 55 } 56 57 FieldInfo* field() const { 58 if (_is_accessor) { 59 return _accessor_info; 60 }else { 61 InstanceKlass* ik = field_holder(); 62 return ik->field(_index); 63 } 64 } 65 66 public: 67 fieldDescriptor() { 68 DEBUG_ONLY(_index = badInt); 69 _is_accessor = false; 70 _index = -1; 71 _accessor_info = NULL; 72 } 73 fieldDescriptor(InstanceKlass* ik, int index) { 74 DEBUG_ONLY(_index = badInt); 75 reinitialize(ik, index); 76 } 77 78 void set_sig_for_accessor(Symbol* sig) { 79 this->_sig_for_accessor = sig; 80 } 81 82 void set_field_name_from_accessor(u2 field_name_from_accessor) { 83 this->_field_name_from_accessor = field_name_from_accessor; 84 } 85 86 bool is_accessor() { 87 return _is_accessor; 88 } 89 90 u2 get_get_accessor() { 91 return _getAccessor; 92 } 93 94 u2 get_put_accessor() { 95 return _putAccessor; 96 } 97 98 void set_get_accessor(u2 index) { 99 _getAccessor = index; 100 } 101 102 void set_put_accessor(u2 index) { 103 _putAccessor = index; 104 } 105 106 Symbol* name() const { 107 return _is_accessor ? constants()->symbol_at(_field_name_from_accessor) : field()->name(_cp); 108 } 109 Symbol* signature() const { 110 return _is_accessor ? _sig_for_accessor : field()->signature(_cp); 111 } 112 InstanceKlass* field_holder() const { return _cp->pool_holder(); } 113 ConstantPool* constants() const { return _cp(); } 114 AccessFlags access_flags() const { return _access_flags; } 115 oop loader() const; 116 // Offset (in words) of field from start of instanceOop / Klass* 117 int offset() const { return field()->offset(); } 118 Symbol* generic_signature() const; 119 int index() const { return _index; } 120 AnnotationArray* annotations() const; 121 AnnotationArray* type_annotations() const; 122 123 // Initial field value 124 bool has_initial_value() const { return field()->initval_index() != 0; } 125 int initial_value_index() const { return field()->initval_index(); } 126 constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double() 127 jint int_initial_value() const; 128 jlong long_initial_value() const; 129 jfloat float_initial_value() const; 130 jdouble double_initial_value() const; 131 oop string_initial_value(TRAPS) const; 132 133 // Field signature type 134 BasicType field_type() const { return FieldType::basic_type(signature()); } 135 136 // Access flags 137 bool is_public() const { return access_flags().is_public(); } 138 bool is_private() const { return access_flags().is_private(); } 139 bool is_protected() const { return access_flags().is_protected(); } 140 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 141 142 bool is_static() const { return access_flags().is_static(); } 143 bool is_final() const { return access_flags().is_final(); } 144 bool is_volatile() const { return access_flags().is_volatile(); } 145 bool is_transient() const { return access_flags().is_transient(); } 146 147 bool is_synthetic() const { return access_flags().is_synthetic(); } 148 149 bool is_field_access_watched() const { return access_flags().is_field_access_watched(); } 150 bool is_field_modification_watched() const 151 { return access_flags().is_field_modification_watched(); } 152 bool has_generic_signature() const { return access_flags().field_has_generic_signature(); } 153 154 void set_is_field_access_watched(const bool value) { 155 _access_flags.set_is_field_access_watched(value); 156 update_klass_field_access_flag(); 157 } 158 159 void set_is_field_modification_watched(const bool value) { 160 _access_flags.set_is_field_modification_watched(value); 161 update_klass_field_access_flag(); 162 } 163 164 // Initialization 165 void reinitialize(InstanceKlass* ik, int index); 166 void reinitialize_accessor(InstanceKlass* ik); 167 168 // Print 169 void print() { print_on(tty); } 170 void print_on(outputStream* st) const PRODUCT_RETURN; 171 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN; 172 void verify() const PRODUCT_RETURN; 173 }; 174 175 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP