1 /* 2 * Copyright (c) 1997, 2011, 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/constantPoolOop.hpp" 29 #include "oops/klassOop.hpp" 30 #include "oops/oop.inline.hpp" 31 #include "oops/symbol.hpp" 32 #include "runtime/fieldType.hpp" 33 #include "utilities/accessFlags.hpp" 34 #include "utilities/constantTag.hpp" 35 36 // A fieldDescriptor describes the attributes of a single field (instance or class variable). 37 // It needs the class constant pool to work (because it only holds indices into the pool 38 // rather than the actual info). 39 40 class fieldDescriptor VALUE_OBJ_CLASS_SPEC { 41 private: 42 AccessFlags _access_flags; 43 int _index; // the field index 44 constantPoolHandle _cp; 45 46 // update the access_flags for the field in the klass 47 void update_klass_field_access_flag() { 48 instanceKlass* ik = instanceKlass::cast(field_holder()); 49 ik->field(index())->set_access_flags(_access_flags.as_short()); 50 } 51 52 FieldInfo* field() const { 53 instanceKlass* ik = instanceKlass::cast(field_holder()); 54 return ik->field(_index); 55 } 56 57 public: 58 Symbol* name() const { 59 return field()->name(_cp); 60 } 61 Symbol* signature() const { 62 return field()->signature(_cp); 63 } 64 klassOop field_holder() const { return _cp->pool_holder(); } 65 constantPoolOop constants() const { return _cp(); } 66 AccessFlags access_flags() const { return _access_flags; } 67 oop loader() const; 68 // Offset (in words) of field from start of instanceOop / klassOop 69 int offset() const { return field()->offset(); } 70 Symbol* generic_signature() const; 71 int index() const { return _index; } 72 typeArrayOop annotations() const; 73 74 // Initial field value 75 bool has_initial_value() const { return field()->initval_index() != 0; } 76 int initial_value_index() const { return field()->initval_index(); } 77 constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double() 78 jint int_initial_value() const; 79 jlong long_initial_value() const; 80 jfloat float_initial_value() const; 81 jdouble double_initial_value() const; 82 oop string_initial_value(TRAPS) const; 83 84 // Field signature type 85 BasicType field_type() const { return FieldType::basic_type(signature()); } 86 87 // Access flags 88 bool is_public() const { return access_flags().is_public(); } 89 bool is_private() const { return access_flags().is_private(); } 90 bool is_protected() const { return access_flags().is_protected(); } 91 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 92 93 bool is_static() const { return access_flags().is_static(); } 94 bool is_final() const { return access_flags().is_final(); } 95 bool is_volatile() const { return access_flags().is_volatile(); } 96 bool is_transient() const { return access_flags().is_transient(); } 97 98 bool is_synthetic() const { return access_flags().is_synthetic(); } 99 100 bool is_field_access_watched() const { return access_flags().is_field_access_watched(); } 101 bool is_field_modification_watched() const 102 { return access_flags().is_field_modification_watched(); } 103 bool has_generic_signature() const { return access_flags().field_has_generic_signature(); } 104 105 void set_is_field_access_watched(const bool value) { 106 _access_flags.set_is_field_access_watched(value); 107 update_klass_field_access_flag(); 108 } 109 110 void set_is_field_modification_watched(const bool value) { 111 _access_flags.set_is_field_modification_watched(value); 112 update_klass_field_access_flag(); 113 } 114 115 // Initialization 116 void initialize(klassOop k, int index); 117 118 // Print 119 void print_on(outputStream* st) const PRODUCT_RETURN; 120 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN; 121 }; 122 123 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP