1 /* 2 * Copyright (c) 1997, 2010, 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/symbolOop.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 _name_index; 44 int _signature_index; 45 int _initial_value_index; 46 int _offset; 47 int _generic_signature_index; 48 int _index; // index into fields() array 49 constantPoolHandle _cp; 50 51 public: 52 symbolOop name() const { return _cp->symbol_at(_name_index); } 53 symbolOop signature() const { return _cp->symbol_at(_signature_index); } 54 klassOop field_holder() const { return _cp->pool_holder(); } 55 constantPoolOop constants() const { return _cp(); } 56 AccessFlags access_flags() const { return _access_flags; } 57 oop loader() const; 58 // Offset (in words) of field from start of instanceOop / klassOop 59 int offset() const { return _offset; } 60 symbolOop generic_signature() const { return (_generic_signature_index > 0 ? _cp->symbol_at(_generic_signature_index) : (symbolOop)NULL); } 61 int index() const { return _index; } 62 typeArrayOop annotations() const; 63 64 // Initial field value 65 bool has_initial_value() const { return _initial_value_index != 0; } 66 constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double() 67 jint int_initial_value() const; 68 jlong long_initial_value() const; 69 jfloat float_initial_value() const; 70 jdouble double_initial_value() const; 71 oop string_initial_value(TRAPS) const; 72 73 // Field signature type 74 BasicType field_type() const { return FieldType::basic_type(signature()); } 75 76 // Access flags 77 bool is_public() const { return _access_flags.is_public(); } 78 bool is_private() const { return _access_flags.is_private(); } 79 bool is_protected() const { return _access_flags.is_protected(); } 80 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); } 81 82 bool is_static() const { return _access_flags.is_static(); } 83 bool is_final() const { return _access_flags.is_final(); } 84 bool is_volatile() const { return _access_flags.is_volatile(); } 85 bool is_transient() const { return _access_flags.is_transient(); } 86 87 bool is_synthetic() const { return _access_flags.is_synthetic(); } 88 89 bool is_field_access_watched() const { return _access_flags.is_field_access_watched(); } 90 bool is_field_modification_watched() const 91 { return _access_flags.is_field_modification_watched(); } 92 void set_is_field_access_watched(const bool value) 93 { _access_flags.set_is_field_access_watched(value); } 94 void set_is_field_modification_watched(const bool value) 95 { _access_flags.set_is_field_modification_watched(value); } 96 97 // Initialization 98 void initialize(klassOop k, int index); 99 100 // Print 101 void print_on(outputStream* st) const PRODUCT_RETURN; 102 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN; 103 }; 104 105 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP