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 44 // update the access_flags for the field in the klass 45 void update_klass_field_access_flag() { 46 InstanceKlass* ik = field_holder(); 47 ik->field(index())->set_access_flags(_access_flags.as_short()); 48 } 49 50 FieldInfo* field() const { 51 InstanceKlass* ik = field_holder(); 52 return ik->field(_index); 53 } 54 55 public: 56 fieldDescriptor() { 57 DEBUG_ONLY(_index = badInt); 58 } 59 fieldDescriptor(InstanceKlass* ik, int index) { 60 DEBUG_ONLY(_index = badInt); 61 reinitialize(ik, index); 62 } 63 Symbol* name() const { 64 return field()->name(_cp); 65 } 66 Symbol* signature() const { 67 return field()->signature(_cp); 68 } 69 InstanceKlass* field_holder() const { return _cp->pool_holder(); } 70 ConstantPool* constants() const { return _cp(); } 71 AccessFlags access_flags() const { return _access_flags; } 72 oop loader() const; 73 // Offset (in words) of field from start of instanceOop / Klass* 74 int offset() const { return field()->offset(); } 75 Symbol* generic_signature() const; 76 int index() const { return _index; } 77 AnnotationArray* annotations() const; 78 AnnotationArray* type_annotations() const; 79 80 // Initial field value 81 bool has_initial_value() const { return field()->initval_index() != 0; } 82 int initial_value_index() const { return field()->initval_index(); } 83 constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double() 84 jint int_initial_value() const; 85 jlong long_initial_value() const; 86 jfloat float_initial_value() const; 87 jdouble double_initial_value() const; 88 oop string_initial_value(TRAPS) const; 89 90 // Field signature type 91 BasicType field_type() const { return FieldType::basic_type(signature()); } 92 93 // Access flags 94 bool is_public() const { return access_flags().is_public(); } 95 bool is_private() const { return access_flags().is_private(); } 96 bool is_protected() const { return access_flags().is_protected(); } 97 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 98 99 bool is_static() const { return access_flags().is_static(); } 100 bool is_final() const { return access_flags().is_final(); } 101 bool is_volatile() const { return access_flags().is_volatile(); } 102 bool is_transient() const { return access_flags().is_transient(); } 103 104 bool is_synthetic() const { return access_flags().is_synthetic(); } 105 106 bool is_field_access_watched() const { return access_flags().is_field_access_watched(); } 107 bool is_field_modification_watched() const 108 { return access_flags().is_field_modification_watched(); } 109 bool has_generic_signature() const { return access_flags().field_has_generic_signature(); } 110 111 void set_is_field_access_watched(const bool value) { 112 _access_flags.set_is_field_access_watched(value); 113 update_klass_field_access_flag(); 114 } 115 116 void set_is_field_modification_watched(const bool value) { 117 _access_flags.set_is_field_modification_watched(value); 118 update_klass_field_access_flag(); 119 } 120 121 // Initialization 122 void reinitialize(InstanceKlass* ik, int index); 123 124 // Print 125 void print() { print_on(tty); } 126 void print_on(outputStream* st) const PRODUCT_RETURN; 127 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN; 128 void verify() const PRODUCT_RETURN; 129 }; 130 131 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP