22 *
23 */
24
25 #ifndef SHARE_OOPS_FIELDSTREAMS_HPP
26 #define SHARE_OOPS_FIELDSTREAMS_HPP
27
28 #include "oops/instanceKlass.hpp"
29 #include "oops/fieldInfo.hpp"
30 #include "runtime/fieldDescriptor.hpp"
31
32 // The is the base class for iteration over the fields array
33 // describing the declared fields in the class. Several subclasses
34 // are provided depending on the kind of iteration required. The
35 // JavaFieldStream is for iterating over regular Java fields and it
36 // generally the preferred iterator. InternalFieldStream only
37 // iterates over fields that have been injected by the JVM.
38 // AllFieldStream exposes all fields and should only be used in rare
39 // cases.
40 // HierarchicalFieldStream allows to also iterate over fields of supertypes.
41 class FieldStreamBase : public StackObj {
42 protected:
43 const Array<u1>* _fieldinfo_stream;
44 FieldInfoReader _reader;
45 constantPoolHandle _constants;
46 int _index;
47 int _limit;
48
49 FieldInfo _fi_buf;
50 fieldDescriptor _fd_buf;
51
52 FieldInfo const * field() const {
53 assert(!done(), "no more fields");
54 return &_fi_buf;
55 }
56
57 inline FieldStreamBase(const Array<u1>* fieldinfo_stream, ConstantPool* constants, int start, int limit);
58
59 inline FieldStreamBase(Array<u1>* fieldinfo_stream, ConstantPool* constants);
60
61 private:
93 Symbol* name() const {
94 return field()->name(_constants());
95 }
96
97 Symbol* signature() const {
98 return field()->signature(_constants());
99 }
100
101 Symbol* generic_signature() const {
102 if (field()->field_flags().is_generic()) {
103 return _constants->symbol_at(field()->generic_signature_index());
104 } else {
105 return nullptr;
106 }
107 }
108
109 int offset() const {
110 return field()->offset();
111 }
112
113 bool is_contended() const {
114 return field()->is_contended();
115 }
116
117 int contended_group() const {
118 return field()->contended_group();
119 }
120
121 // Convenient methods
122
123 const FieldInfo& to_FieldInfo() const {
124 return _fi_buf;
125 }
126
127 int num_total_fields() const {
128 return FieldInfoStream::num_total_fields(_fieldinfo_stream);
129 }
130
131 // bridge to a heavier API:
132 fieldDescriptor& field_descriptor() const {
133 fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf);
134 field.reinitialize(field_holder(), to_FieldInfo());
135 return field;
136 }
137 };
138
139 // Iterate over only the Java fields
140 class JavaFieldStream : public FieldStreamBase {
220 }
221 }
222
223 public:
224 HierarchicalFieldStream(InstanceKlass* klass) :
225 _interfaces(klass->transitive_interfaces()),
226 _next_klass(klass),
227 _current_stream(FieldStreamType(klass)),
228 _interface_index(_interfaces->length()) {
229 prepare();
230 }
231
232 void next() {
233 _current_stream.next();
234 next_stream_if_done();
235 }
236
237 bool done() const { return _next_klass == nullptr && _current_stream.done(); }
238
239 // bridge functions from FieldStreamBase
240
241 AccessFlags access_flags() const {
242 return _current_stream.access_flags();
243 }
244
245 FieldInfo::FieldFlags field_flags() const {
246 return _current_stream.field_flags();
247 }
248
249 Symbol* name() const {
250 return _current_stream.name();
251 }
252
253 Symbol* signature() const {
254 return _current_stream.signature();
255 }
256
257 Symbol* generic_signature() const {
258 return _current_stream.generic_signature();
259 }
261 int offset() const {
262 return _current_stream.offset();
263 }
264
265 bool is_contended() const {
266 return _current_stream.is_contended();
267 }
268
269 int contended_group() const {
270 return _current_stream.contended_group();
271 }
272
273 FieldInfo to_FieldInfo() {
274 return _current_stream.to_FieldInfo();
275 }
276
277 fieldDescriptor& field_descriptor() const {
278 return _current_stream.field_descriptor();
279 }
280
281 };
282
283 #endif // SHARE_OOPS_FIELDSTREAMS_HPP
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22 *
23 */
24
25 #ifndef SHARE_OOPS_FIELDSTREAMS_HPP
26 #define SHARE_OOPS_FIELDSTREAMS_HPP
27
28 #include "oops/instanceKlass.hpp"
29 #include "oops/fieldInfo.hpp"
30 #include "runtime/fieldDescriptor.hpp"
31
32 // The is the base class for iteration over the fields array
33 // describing the declared fields in the class. Several subclasses
34 // are provided depending on the kind of iteration required. The
35 // JavaFieldStream is for iterating over regular Java fields and it
36 // generally the preferred iterator. InternalFieldStream only
37 // iterates over fields that have been injected by the JVM.
38 // AllFieldStream exposes all fields and should only be used in rare
39 // cases.
40 // HierarchicalFieldStream allows to also iterate over fields of supertypes.
41 class FieldStreamBase : public StackObj {
42
43 protected:
44 const Array<u1>* _fieldinfo_stream;
45 FieldInfoReader _reader;
46 constantPoolHandle _constants;
47 int _index;
48 int _limit;
49
50 FieldInfo _fi_buf;
51 fieldDescriptor _fd_buf;
52
53 FieldInfo const * field() const {
54 assert(!done(), "no more fields");
55 return &_fi_buf;
56 }
57
58 inline FieldStreamBase(const Array<u1>* fieldinfo_stream, ConstantPool* constants, int start, int limit);
59
60 inline FieldStreamBase(Array<u1>* fieldinfo_stream, ConstantPool* constants);
61
62 private:
94 Symbol* name() const {
95 return field()->name(_constants());
96 }
97
98 Symbol* signature() const {
99 return field()->signature(_constants());
100 }
101
102 Symbol* generic_signature() const {
103 if (field()->field_flags().is_generic()) {
104 return _constants->symbol_at(field()->generic_signature_index());
105 } else {
106 return nullptr;
107 }
108 }
109
110 int offset() const {
111 return field()->offset();
112 }
113
114 bool is_null_free_inline_type() {
115 return field()->field_flags().is_null_free_inline_type();
116 }
117
118 bool is_flat() const {
119 return field()->field_flags().is_flat();
120 }
121
122 bool is_contended() const {
123 return field()->is_contended();
124 }
125
126 int contended_group() const {
127 return field()->contended_group();
128 }
129
130 int null_marker_offset() const {
131 return field()->null_marker_offset();
132 }
133
134 // Convenient methods
135
136 const FieldInfo& to_FieldInfo() const {
137 return _fi_buf;
138 }
139
140 int num_total_fields() const {
141 return FieldInfoStream::num_total_fields(_fieldinfo_stream);
142 }
143
144 // bridge to a heavier API:
145 fieldDescriptor& field_descriptor() const {
146 fieldDescriptor& field = const_cast<fieldDescriptor&>(_fd_buf);
147 field.reinitialize(field_holder(), to_FieldInfo());
148 return field;
149 }
150 };
151
152 // Iterate over only the Java fields
153 class JavaFieldStream : public FieldStreamBase {
233 }
234 }
235
236 public:
237 HierarchicalFieldStream(InstanceKlass* klass) :
238 _interfaces(klass->transitive_interfaces()),
239 _next_klass(klass),
240 _current_stream(FieldStreamType(klass)),
241 _interface_index(_interfaces->length()) {
242 prepare();
243 }
244
245 void next() {
246 _current_stream.next();
247 next_stream_if_done();
248 }
249
250 bool done() const { return _next_klass == nullptr && _current_stream.done(); }
251
252 // bridge functions from FieldStreamBase
253 int index() const {
254 return _current_stream.index();
255 }
256
257 AccessFlags access_flags() const {
258 return _current_stream.access_flags();
259 }
260
261 FieldInfo::FieldFlags field_flags() const {
262 return _current_stream.field_flags();
263 }
264
265 Symbol* name() const {
266 return _current_stream.name();
267 }
268
269 Symbol* signature() const {
270 return _current_stream.signature();
271 }
272
273 Symbol* generic_signature() const {
274 return _current_stream.generic_signature();
275 }
277 int offset() const {
278 return _current_stream.offset();
279 }
280
281 bool is_contended() const {
282 return _current_stream.is_contended();
283 }
284
285 int contended_group() const {
286 return _current_stream.contended_group();
287 }
288
289 FieldInfo to_FieldInfo() {
290 return _current_stream.to_FieldInfo();
291 }
292
293 fieldDescriptor& field_descriptor() const {
294 return _current_stream.field_descriptor();
295 }
296
297 bool is_flat() const {
298 return _current_stream.is_flat();
299 }
300
301 bool is_null_free_inline_type() {
302 return _current_stream.is_null_free_inline_type();
303 }
304
305 int null_marker_offset() {
306 return _current_stream.null_marker_offset();
307 }
308 };
309
310 #endif // SHARE_OOPS_FIELDSTREAMS_HPP
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