Mercurial > hg > truffle
annotate src/share/vm/oops/fieldStreams.hpp @ 6233:d5bc62fcfac7
Merge
author | zgu |
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date | Thu, 19 Jul 2012 09:10:12 -0400 |
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3938 | 1 /* |
2 * Copyright (c) 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_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: | |
41 typeArrayHandle _fields; | |
42 constantPoolHandle _constants; | |
43 int _index; | |
44 int _limit; | |
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45 int _generic_signature_slot; |
3938 | 46 |
47 FieldInfo* field() const { return FieldInfo::from_field_array(_fields(), _index); } | |
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 |
3938 | 79 FieldStreamBase(typeArrayHandle fields, constantPoolHandle constants, int start, int limit) { |
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 | |
91 FieldStreamBase(typeArrayHandle fields, constantPoolHandle constants) { | |
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: | |
99 FieldStreamBase(instanceKlass* klass) { | |
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->short_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(instanceKlass* k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {} | |
172 JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {} | |
173 | |
174 int name_index() const { | |
175 assert(!field()->is_internal(), "regular only"); | |
176 return field()->name_index(); | |
177 } | |
178 void set_name_index(int index) { | |
179 assert(!field()->is_internal(), "regular only"); | |
180 field()->set_name_index(index); | |
181 } | |
182 int signature_index() const { | |
183 assert(!field()->is_internal(), "regular only"); | |
184 return field()->signature_index(); | |
185 } | |
186 void set_signature_index(int index) { | |
187 assert(!field()->is_internal(), "regular only"); | |
188 field()->set_signature_index(index); | |
189 } | |
190 int generic_signature_index() const { | |
191 assert(!field()->is_internal(), "regular only"); | |
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192 if (access_flags().field_has_generic_signature()) { |
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193 assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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194 return _fields->short_at(_generic_signature_slot); |
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195 } else { |
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196 return 0; |
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197 } |
3938 | 198 } |
199 void set_generic_signature_index(int index) { | |
200 assert(!field()->is_internal(), "regular only"); | |
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201 if (access_flags().field_has_generic_signature()) { |
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202 assert(_generic_signature_slot < _fields->length(), "out of bounds"); |
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203 _fields->short_at_put(_generic_signature_slot, index); |
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204 } |
3938 | 205 } |
206 int initval_index() const { | |
207 assert(!field()->is_internal(), "regular only"); | |
208 return field()->initval_index(); | |
209 } | |
210 void set_initval_index(int index) { | |
211 assert(!field()->is_internal(), "regular only"); | |
212 return field()->set_initval_index(index); | |
213 } | |
214 }; | |
215 | |
216 | |
217 // Iterate over only the internal fields | |
218 class InternalFieldStream : public FieldStreamBase { | |
219 public: | |
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220 InternalFieldStream(instanceKlass* k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
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221 InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {} |
3938 | 222 }; |
223 | |
224 | |
225 class AllFieldStream : public FieldStreamBase { | |
226 public: | |
227 AllFieldStream(typeArrayHandle fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {} | |
228 AllFieldStream(instanceKlass* k): FieldStreamBase(k->fields(), k->constants()) {} | |
229 AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {} | |
230 }; | |
231 | |
232 #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP |