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annotate src/share/vm/runtime/fieldDescriptor.hpp @ 18096:ca6d25be853b jdk8u25-b13

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8044269: Analysis of archive files. Summary: Add checksum verification. Reviewed-by: iklam, dholmes, mschoene
author jiangli
date Tue, 12 Aug 2014 17:46:16 -0400
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children cefad50507d8
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1 /*
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
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26 #define SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
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27
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28 #include "oops/constantPool.hpp"
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29 #include "oops/symbol.hpp"
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30 #include "runtime/fieldType.hpp"
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31 #include "utilities/accessFlags.hpp"
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32 #include "utilities/constantTag.hpp"
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33
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34 // A fieldDescriptor describes the attributes of a single field (instance or class variable).
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35 // It needs the class constant pool to work (because it only holds indices into the pool
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36 // rather than the actual info).
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37
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38 class fieldDescriptor VALUE_OBJ_CLASS_SPEC {
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39 private:
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40 AccessFlags _access_flags;
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41 int _index; // the field index
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42 constantPoolHandle _cp;
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43
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44 // update the access_flags for the field in the klass
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45 void update_klass_field_access_flag() {
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46 InstanceKlass* ik = field_holder();
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47 ik->field(index())->set_access_flags(_access_flags.as_short());
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48 }
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49
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50 FieldInfo* field() const {
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51 InstanceKlass* ik = field_holder();
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52 return ik->field(_index);
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53 }
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54
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55 public:
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56 fieldDescriptor() {
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57 DEBUG_ONLY(_index = badInt);
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58 }
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59 fieldDescriptor(InstanceKlass* ik, int index) {
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60 DEBUG_ONLY(_index = badInt);
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61 reinitialize(ik, index);
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62 }
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63 Symbol* name() const {
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64 return field()->name(_cp);
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65 }
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66 Symbol* signature() const {
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67 return field()->signature(_cp);
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68 }
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69 InstanceKlass* field_holder() const { return _cp->pool_holder(); }
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70 ConstantPool* constants() const { return _cp(); }
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71 AccessFlags access_flags() const { return _access_flags; }
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72 oop loader() const;
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73 // Offset (in words) of field from start of instanceOop / Klass*
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74 int offset() const { return field()->offset(); }
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75 Symbol* generic_signature() const;
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76 int index() const { return _index; }
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77 AnnotationArray* annotations() const;
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78 AnnotationArray* type_annotations() const;
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80 // Initial field value
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81 bool has_initial_value() const { return field()->initval_index() != 0; }
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82 int initial_value_index() const { return field()->initval_index(); }
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83 constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double()
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84 jint int_initial_value() const;
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85 jlong long_initial_value() const;
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86 jfloat float_initial_value() const;
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87 jdouble double_initial_value() const;
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88 oop string_initial_value(TRAPS) const;
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90 // Field signature type
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91 BasicType field_type() const { return FieldType::basic_type(signature()); }
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92
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93 // Access flags
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94 bool is_public() const { return access_flags().is_public(); }
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95 bool is_private() const { return access_flags().is_private(); }
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96 bool is_protected() const { return access_flags().is_protected(); }
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97 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
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98
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99 bool is_static() const { return access_flags().is_static(); }
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100 bool is_final() const { return access_flags().is_final(); }
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101 bool is_volatile() const { return access_flags().is_volatile(); }
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102 bool is_transient() const { return access_flags().is_transient(); }
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103
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104 bool is_synthetic() const { return access_flags().is_synthetic(); }
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105
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106 bool is_field_access_watched() const { return access_flags().is_field_access_watched(); }
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107 bool is_field_modification_watched() const
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108 { return access_flags().is_field_modification_watched(); }
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109 bool has_generic_signature() const { return access_flags().field_has_generic_signature(); }
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110
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111 void set_is_field_access_watched(const bool value) {
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112 _access_flags.set_is_field_access_watched(value);
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113 update_klass_field_access_flag();
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114 }
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115
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116 void set_is_field_modification_watched(const bool value) {
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117 _access_flags.set_is_field_modification_watched(value);
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118 update_klass_field_access_flag();
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119 }
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121 // Initialization
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122 void reinitialize(InstanceKlass* ik, int index);
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123
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124 // Print
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125 void print() { print_on(tty); }
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126 void print_on(outputStream* st) const PRODUCT_RETURN;
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127 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN;
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128 void verify() const PRODUCT_RETURN;
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129 };
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130
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131 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP