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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
aoqi@0 | 1 | /* |
aoqi@0 | 2 | * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
aoqi@0 | 4 | * |
aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
aoqi@0 | 7 | * published by the Free Software Foundation. |
aoqi@0 | 8 | * |
aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
aoqi@0 | 13 | * accompanied this code). |
aoqi@0 | 14 | * |
aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
aoqi@0 | 18 | * |
aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
aoqi@0 | 21 | * questions. |
aoqi@0 | 22 | * |
aoqi@0 | 23 | */ |
aoqi@0 | 24 | |
aoqi@0 | 25 | #ifndef SHARE_VM_OOPS_FIELDSTREAMS_HPP |
aoqi@0 | 26 | #define SHARE_VM_OOPS_FIELDSTREAMS_HPP |
aoqi@0 | 27 | |
aoqi@0 | 28 | #include "oops/instanceKlass.hpp" |
aoqi@0 | 29 | #include "oops/fieldInfo.hpp" |
aoqi@0 | 30 | #include "runtime/fieldDescriptor.hpp" |
aoqi@0 | 31 | |
aoqi@0 | 32 | // The is the base class for iteration over the fields array |
aoqi@0 | 33 | // describing the declared fields in the class. Several subclasses |
aoqi@0 | 34 | // are provided depending on the kind of iteration required. The |
aoqi@0 | 35 | // JavaFieldStream is for iterating over regular Java fields and it |
aoqi@0 | 36 | // generally the preferred iterator. InternalFieldStream only |
aoqi@0 | 37 | // iterates over fields that have been injected by the JVM. |
aoqi@0 | 38 | // AllFieldStream exposes all fields and should only be used in rare |
aoqi@0 | 39 | // cases. |
aoqi@0 | 40 | class FieldStreamBase : public StackObj { |
aoqi@0 | 41 | protected: |
aoqi@0 | 42 | Array<u2>* _fields; |
aoqi@0 | 43 | constantPoolHandle _constants; |
aoqi@0 | 44 | int _index; |
aoqi@0 | 45 | int _limit; |
aoqi@0 | 46 | int _generic_signature_slot; |
aoqi@0 | 47 | fieldDescriptor _fd_buf; |
aoqi@0 | 48 | |
aoqi@0 | 49 | FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); } |
aoqi@0 | 50 | InstanceKlass* field_holder() const { return _constants->pool_holder(); } |
aoqi@0 | 51 | |
aoqi@0 | 52 | int init_generic_signature_start_slot() { |
aoqi@0 | 53 | int length = _fields->length(); |
aoqi@0 | 54 | int num_fields = 0; |
aoqi@0 | 55 | int skipped_generic_signature_slots = 0; |
aoqi@0 | 56 | FieldInfo* fi; |
aoqi@0 | 57 | AccessFlags flags; |
aoqi@0 | 58 | /* Scan from 0 to the current _index. Count the number of generic |
aoqi@0 | 59 | signature slots for field[0] to field[_index - 1]. */ |
aoqi@0 | 60 | for (int i = 0; i < _index; i++) { |
aoqi@0 | 61 | fi = FieldInfo::from_field_array(_fields, i); |
aoqi@0 | 62 | flags.set_flags(fi->access_flags()); |
aoqi@0 | 63 | if (flags.field_has_generic_signature()) { |
aoqi@0 | 64 | length --; |
aoqi@0 | 65 | skipped_generic_signature_slots ++; |
aoqi@0 | 66 | } |
aoqi@0 | 67 | } |
aoqi@0 | 68 | /* Scan from the current _index. */ |
aoqi@0 | 69 | for (int i = _index; i*FieldInfo::field_slots < length; i++) { |
aoqi@0 | 70 | fi = FieldInfo::from_field_array(_fields, i); |
aoqi@0 | 71 | flags.set_flags(fi->access_flags()); |
aoqi@0 | 72 | if (flags.field_has_generic_signature()) { |
aoqi@0 | 73 | length --; |
aoqi@0 | 74 | } |
aoqi@0 | 75 | num_fields ++; |
aoqi@0 | 76 | } |
aoqi@0 | 77 | _generic_signature_slot = length + skipped_generic_signature_slots; |
aoqi@0 | 78 | assert(_generic_signature_slot <= _fields->length(), ""); |
aoqi@0 | 79 | return num_fields; |
aoqi@0 | 80 | } |
aoqi@0 | 81 | |
aoqi@0 | 82 | FieldStreamBase(Array<u2>* fields, constantPoolHandle constants, int start, int limit) { |
aoqi@0 | 83 | _fields = fields; |
aoqi@0 | 84 | _constants = constants; |
aoqi@0 | 85 | _index = start; |
aoqi@0 | 86 | int num_fields = init_generic_signature_start_slot(); |
aoqi@0 | 87 | if (limit < start) { |
aoqi@0 | 88 | _limit = num_fields; |
aoqi@0 | 89 | } else { |
aoqi@0 | 90 | _limit = limit; |
aoqi@0 | 91 | } |
aoqi@0 | 92 | } |
aoqi@0 | 93 | |
aoqi@0 | 94 | FieldStreamBase(Array<u2>* fields, constantPoolHandle constants) { |
aoqi@0 | 95 | _fields = fields; |
aoqi@0 | 96 | _constants = constants; |
aoqi@0 | 97 | _index = 0; |
aoqi@0 | 98 | _limit = init_generic_signature_start_slot(); |
aoqi@0 | 99 | } |
aoqi@0 | 100 | |
aoqi@0 | 101 | public: |
aoqi@0 | 102 | FieldStreamBase(InstanceKlass* klass) { |
aoqi@0 | 103 | _fields = klass->fields(); |
aoqi@0 | 104 | _constants = klass->constants(); |
aoqi@0 | 105 | _index = 0; |
aoqi@0 | 106 | _limit = klass->java_fields_count(); |
aoqi@0 | 107 | init_generic_signature_start_slot(); |
aoqi@0 | 108 | assert(klass == field_holder(), ""); |
aoqi@0 | 109 | } |
aoqi@0 | 110 | FieldStreamBase(instanceKlassHandle klass) { |
aoqi@0 | 111 | _fields = klass->fields(); |
aoqi@0 | 112 | _constants = klass->constants(); |
aoqi@0 | 113 | _index = 0; |
aoqi@0 | 114 | _limit = klass->java_fields_count(); |
aoqi@0 | 115 | init_generic_signature_start_slot(); |
aoqi@0 | 116 | assert(klass == field_holder(), ""); |
aoqi@0 | 117 | } |
aoqi@0 | 118 | |
aoqi@0 | 119 | // accessors |
aoqi@0 | 120 | int index() const { return _index; } |
aoqi@0 | 121 | |
aoqi@0 | 122 | void next() { |
aoqi@0 | 123 | if (access_flags().field_has_generic_signature()) { |
aoqi@0 | 124 | _generic_signature_slot ++; |
aoqi@0 | 125 | assert(_generic_signature_slot <= _fields->length(), ""); |
aoqi@0 | 126 | } |
aoqi@0 | 127 | _index += 1; |
aoqi@0 | 128 | } |
aoqi@0 | 129 | bool done() const { return _index >= _limit; } |
aoqi@0 | 130 | |
aoqi@0 | 131 | // Accessors for current field |
aoqi@0 | 132 | AccessFlags access_flags() const { |
aoqi@0 | 133 | AccessFlags flags; |
aoqi@0 | 134 | flags.set_flags(field()->access_flags()); |
aoqi@0 | 135 | return flags; |
aoqi@0 | 136 | } |
aoqi@0 | 137 | |
aoqi@0 | 138 | void set_access_flags(u2 flags) const { |
aoqi@0 | 139 | field()->set_access_flags(flags); |
aoqi@0 | 140 | } |
aoqi@0 | 141 | |
aoqi@0 | 142 | void set_access_flags(AccessFlags flags) const { |
aoqi@0 | 143 | set_access_flags(flags.as_short()); |
aoqi@0 | 144 | } |
aoqi@0 | 145 | |
aoqi@0 | 146 | Symbol* name() const { |
aoqi@0 | 147 | return field()->name(_constants); |
aoqi@0 | 148 | } |
aoqi@0 | 149 | |
aoqi@0 | 150 | Symbol* signature() const { |
aoqi@0 | 151 | return field()->signature(_constants); |
aoqi@0 | 152 | } |
aoqi@0 | 153 | |
aoqi@0 | 154 | Symbol* generic_signature() const { |
aoqi@0 | 155 | if (access_flags().field_has_generic_signature()) { |
aoqi@0 | 156 | assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
aoqi@0 | 157 | int index = _fields->at(_generic_signature_slot); |
aoqi@0 | 158 | return _constants->symbol_at(index); |
aoqi@0 | 159 | } else { |
aoqi@0 | 160 | return NULL; |
aoqi@0 | 161 | } |
aoqi@0 | 162 | } |
aoqi@0 | 163 | |
aoqi@0 | 164 | int offset() const { |
aoqi@0 | 165 | return field()->offset(); |
aoqi@0 | 166 | } |
aoqi@0 | 167 | |
aoqi@0 | 168 | int allocation_type() const { |
aoqi@0 | 169 | return field()->allocation_type(); |
aoqi@0 | 170 | } |
aoqi@0 | 171 | |
aoqi@0 | 172 | void set_offset(int offset) { |
aoqi@0 | 173 | field()->set_offset(offset); |
aoqi@0 | 174 | } |
aoqi@0 | 175 | |
aoqi@0 | 176 | bool is_offset_set() const { |
aoqi@0 | 177 | return field()->is_offset_set(); |
aoqi@0 | 178 | } |
aoqi@0 | 179 | |
aoqi@0 | 180 | bool is_contended() const { |
aoqi@0 | 181 | return field()->is_contended(); |
aoqi@0 | 182 | } |
aoqi@0 | 183 | |
aoqi@0 | 184 | int contended_group() const { |
aoqi@0 | 185 | return field()->contended_group(); |
aoqi@0 | 186 | } |
aoqi@0 | 187 | |
aoqi@0 | 188 | // bridge to a heavier API: |
aoqi@0 | 189 | fieldDescriptor& field_descriptor() const { |
aoqi@0 | 190 | fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf); |
aoqi@0 | 191 | field.reinitialize(field_holder(), _index); |
aoqi@0 | 192 | return field; |
aoqi@0 | 193 | } |
aoqi@0 | 194 | }; |
aoqi@0 | 195 | |
aoqi@0 | 196 | // Iterate over only the internal fields |
aoqi@0 | 197 | class JavaFieldStream : public FieldStreamBase { |
aoqi@0 | 198 | public: |
aoqi@0 | 199 | JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {} |
aoqi@0 | 200 | |
aoqi@0 | 201 | int name_index() const { |
aoqi@0 | 202 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 203 | return field()->name_index(); |
aoqi@0 | 204 | } |
aoqi@0 | 205 | void set_name_index(int index) { |
aoqi@0 | 206 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 207 | field()->set_name_index(index); |
aoqi@0 | 208 | } |
aoqi@0 | 209 | int signature_index() const { |
aoqi@0 | 210 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 211 | return field()->signature_index(); |
aoqi@0 | 212 | } |
aoqi@0 | 213 | void set_signature_index(int index) { |
aoqi@0 | 214 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 215 | field()->set_signature_index(index); |
aoqi@0 | 216 | } |
aoqi@0 | 217 | int generic_signature_index() const { |
aoqi@0 | 218 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 219 | if (access_flags().field_has_generic_signature()) { |
aoqi@0 | 220 | assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
aoqi@0 | 221 | return _fields->at(_generic_signature_slot); |
aoqi@0 | 222 | } else { |
aoqi@0 | 223 | return 0; |
aoqi@0 | 224 | } |
aoqi@0 | 225 | } |
aoqi@0 | 226 | void set_generic_signature_index(int index) { |
aoqi@0 | 227 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 228 | if (access_flags().field_has_generic_signature()) { |
aoqi@0 | 229 | assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
aoqi@0 | 230 | _fields->at_put(_generic_signature_slot, index); |
aoqi@0 | 231 | } |
aoqi@0 | 232 | } |
aoqi@0 | 233 | int initval_index() const { |
aoqi@0 | 234 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 235 | return field()->initval_index(); |
aoqi@0 | 236 | } |
aoqi@0 | 237 | void set_initval_index(int index) { |
aoqi@0 | 238 | assert(!field()->is_internal(), "regular only"); |
aoqi@0 | 239 | return field()->set_initval_index(index); |
aoqi@0 | 240 | } |
aoqi@0 | 241 | }; |
aoqi@0 | 242 | |
aoqi@0 | 243 | |
aoqi@0 | 244 | // Iterate over only the internal fields |
aoqi@0 | 245 | class InternalFieldStream : public FieldStreamBase { |
aoqi@0 | 246 | public: |
aoqi@0 | 247 | InternalFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
aoqi@0 | 248 | InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
aoqi@0 | 249 | }; |
aoqi@0 | 250 | |
aoqi@0 | 251 | |
aoqi@0 | 252 | class AllFieldStream : public FieldStreamBase { |
aoqi@0 | 253 | public: |
aoqi@0 | 254 | AllFieldStream(Array<u2>* fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {} |
aoqi@0 | 255 | AllFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {} |
aoqi@0 | 256 | AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {} |
aoqi@0 | 257 | }; |
aoqi@0 | 258 | |
aoqi@0 | 259 | #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP |