Mercurial > hg > truffle
annotate src/share/vm/oops/fieldStreams.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 71afdabfd05b |
| children | 4a916f2ce331 |
| rev | line source |
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| 3938 | 1 /* |
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2 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| 3938 | 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_OOPS_FIELDSTREAMS_HPP | |
| 26 #define SHARE_VM_OOPS_FIELDSTREAMS_HPP | |
| 27 | |
| 28 #include "oops/instanceKlass.hpp" | |
| 29 #include "oops/fieldInfo.hpp" | |
| 30 | |
| 31 // The is the base class for iteration over the fields array | |
| 32 // describing the declared fields in the class. Several subclasses | |
| 33 // are provided depending on the kind of iteration required. The | |
| 34 // JavaFieldStream is for iterating over regular Java fields and it | |
| 35 // generally the preferred iterator. InternalFieldStream only | |
| 36 // iterates over fields that have been injected by the JVM. | |
| 37 // AllFieldStream exposes all fields and should only be used in rare | |
| 38 // cases. | |
| 39 class FieldStreamBase : public StackObj { | |
| 40 protected: | |
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41 Array<u2>* _fields; |
| 3938 | 42 constantPoolHandle _constants; |
| 43 int _index; | |
| 44 int _limit; | |
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45 int _generic_signature_slot; |
| 3938 | 46 |
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47 FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); } |
| 3938 | 48 |
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49 int init_generic_signature_start_slot() { |
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50 int length = _fields->length(); |
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51 int num_fields = 0; |
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52 int skipped_generic_signature_slots = 0; |
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53 FieldInfo* fi; |
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54 AccessFlags flags; |
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55 /* Scan from 0 to the current _index. Count the number of generic |
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56 signature slots for field[0] to field[_index - 1]. */ |
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57 for (int i = 0; i < _index; i++) { |
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58 fi = FieldInfo::from_field_array(_fields, i); |
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59 flags.set_flags(fi->access_flags()); |
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60 if (flags.field_has_generic_signature()) { |
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61 length --; |
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62 skipped_generic_signature_slots ++; |
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63 } |
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64 } |
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65 /* Scan from the current _index. */ |
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66 for (int i = _index; i*FieldInfo::field_slots < length; i++) { |
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67 fi = FieldInfo::from_field_array(_fields, i); |
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68 flags.set_flags(fi->access_flags()); |
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69 if (flags.field_has_generic_signature()) { |
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70 length --; |
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71 } |
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72 num_fields ++; |
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73 } |
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74 _generic_signature_slot = length + skipped_generic_signature_slots; |
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75 assert(_generic_signature_slot <= _fields->length(), ""); |
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76 return num_fields; |
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77 } |
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78 |
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79 FieldStreamBase(Array<u2>* fields, constantPoolHandle constants, int start, int limit) { |
| 3938 | 80 _fields = fields; |
| 81 _constants = constants; | |
| 82 _index = start; | |
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83 int num_fields = init_generic_signature_start_slot(); |
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84 if (limit < start) { |
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85 _limit = num_fields; |
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86 } else { |
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87 _limit = limit; |
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88 } |
| 3938 | 89 } |
| 90 | |
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91 FieldStreamBase(Array<u2>* fields, constantPoolHandle constants) { |
| 3938 | 92 _fields = fields; |
| 93 _constants = constants; | |
| 94 _index = 0; | |
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95 _limit = init_generic_signature_start_slot(); |
| 3938 | 96 } |
| 97 | |
| 98 public: | |
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99 FieldStreamBase(InstanceKlass* klass) { |
| 3938 | 100 _fields = klass->fields(); |
| 101 _constants = klass->constants(); | |
| 102 _index = 0; | |
| 103 _limit = klass->java_fields_count(); | |
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104 init_generic_signature_start_slot(); |
| 3938 | 105 } |
| 106 FieldStreamBase(instanceKlassHandle klass) { | |
| 107 _fields = klass->fields(); | |
| 108 _constants = klass->constants(); | |
| 109 _index = 0; | |
| 110 _limit = klass->java_fields_count(); | |
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111 init_generic_signature_start_slot(); |
| 3938 | 112 } |
| 113 | |
| 114 // accessors | |
| 115 int index() const { return _index; } | |
| 116 | |
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117 void next() { |
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118 if (access_flags().field_has_generic_signature()) { |
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119 _generic_signature_slot ++; |
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120 assert(_generic_signature_slot <= _fields->length(), ""); |
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121 } |
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122 _index += 1; |
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123 } |
| 3938 | 124 bool done() const { return _index >= _limit; } |
| 125 | |
| 126 // Accessors for current field | |
| 127 AccessFlags access_flags() const { | |
| 128 AccessFlags flags; | |
| 129 flags.set_flags(field()->access_flags()); | |
| 130 return flags; | |
| 131 } | |
| 132 | |
| 133 void set_access_flags(u2 flags) const { | |
| 134 field()->set_access_flags(flags); | |
| 135 } | |
| 136 | |
| 137 void set_access_flags(AccessFlags flags) const { | |
| 138 set_access_flags(flags.as_short()); | |
| 139 } | |
| 140 | |
| 141 Symbol* name() const { | |
| 142 return field()->name(_constants); | |
| 143 } | |
| 144 | |
| 145 Symbol* signature() const { | |
| 146 return field()->signature(_constants); | |
| 147 } | |
| 148 | |
| 149 Symbol* generic_signature() const { | |
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150 if (access_flags().field_has_generic_signature()) { |
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151 assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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152 int index = _fields->at(_generic_signature_slot); |
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153 return _constants->symbol_at(index); |
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154 } else { |
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155 return NULL; |
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156 } |
| 3938 | 157 } |
| 158 | |
| 159 int offset() const { | |
| 160 return field()->offset(); | |
| 161 } | |
| 162 | |
| 163 void set_offset(int offset) { | |
| 164 field()->set_offset(offset); | |
| 165 } | |
| 166 }; | |
| 167 | |
| 168 // Iterate over only the internal fields | |
| 169 class JavaFieldStream : public FieldStreamBase { | |
| 170 public: | |
| 171 JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {} | |
| 172 | |
| 173 int name_index() const { | |
| 174 assert(!field()->is_internal(), "regular only"); | |
| 175 return field()->name_index(); | |
| 176 } | |
| 177 void set_name_index(int index) { | |
| 178 assert(!field()->is_internal(), "regular only"); | |
| 179 field()->set_name_index(index); | |
| 180 } | |
| 181 int signature_index() const { | |
| 182 assert(!field()->is_internal(), "regular only"); | |
| 183 return field()->signature_index(); | |
| 184 } | |
| 185 void set_signature_index(int index) { | |
| 186 assert(!field()->is_internal(), "regular only"); | |
| 187 field()->set_signature_index(index); | |
| 188 } | |
| 189 int generic_signature_index() const { | |
| 190 assert(!field()->is_internal(), "regular only"); | |
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191 if (access_flags().field_has_generic_signature()) { |
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192 assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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193 return _fields->at(_generic_signature_slot); |
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194 } else { |
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195 return 0; |
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196 } |
| 3938 | 197 } |
| 198 void set_generic_signature_index(int index) { | |
| 199 assert(!field()->is_internal(), "regular only"); | |
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200 if (access_flags().field_has_generic_signature()) { |
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201 assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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202 _fields->at_put(_generic_signature_slot, index); |
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203 } |
| 3938 | 204 } |
| 205 int initval_index() const { | |
| 206 assert(!field()->is_internal(), "regular only"); | |
| 207 return field()->initval_index(); | |
| 208 } | |
| 209 void set_initval_index(int index) { | |
| 210 assert(!field()->is_internal(), "regular only"); | |
| 211 return field()->set_initval_index(index); | |
| 212 } | |
| 213 }; | |
| 214 | |
| 215 | |
| 216 // Iterate over only the internal fields | |
| 217 class InternalFieldStream : public FieldStreamBase { | |
| 218 public: | |
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219 InternalFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
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220 InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
| 3938 | 221 }; |
| 222 | |
| 223 | |
| 224 class AllFieldStream : public FieldStreamBase { | |
| 225 public: | |
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226 AllFieldStream(Array<u2>* fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {} |
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227 AllFieldStream(InstanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {} |
| 3938 | 228 AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {} |
| 229 }; | |
| 230 | |
| 231 #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP |