Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.hpp @ 676:d3676b4cb78c
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date | Tue, 31 Mar 2009 10:02:01 -0700 |
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2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // An instanceKlass is the VM level representation of a Java class. | |
26 // It contains all information needed for at class at execution runtime. | |
27 | |
28 // instanceKlass layout: | |
29 // [header ] klassOop | |
30 // [klass pointer ] klassOop | |
31 // [C++ vtbl pointer ] Klass | |
32 // [subtype cache ] Klass | |
33 // [instance size ] Klass | |
34 // [java mirror ] Klass | |
35 // [super ] Klass | |
36 // [access_flags ] Klass | |
37 // [name ] Klass | |
38 // [first subklass ] Klass | |
39 // [next sibling ] Klass | |
40 // [array klasses ] | |
41 // [methods ] | |
42 // [local interfaces ] | |
43 // [transitive interfaces ] | |
44 // [number of implementors ] | |
45 // [implementors ] klassOop[2] | |
46 // [fields ] | |
47 // [constants ] | |
48 // [class loader ] | |
49 // [protection domain ] | |
50 // [signers ] | |
51 // [source file name ] | |
52 // [inner classes ] | |
53 // [static field size ] | |
54 // [nonstatic field size ] | |
55 // [static oop fields size ] | |
56 // [nonstatic oop maps size ] | |
57 // [has finalize method ] | |
58 // [deoptimization mark bit ] | |
59 // [initialization state ] | |
60 // [initializing thread ] | |
61 // [Java vtable length ] | |
62 // [oop map cache (stack maps) ] | |
63 // [EMBEDDED Java vtable ] size in words = vtable_len | |
64 // [EMBEDDED static oop fields ] size in words = static_oop_fields_size | |
65 // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size | |
66 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size | |
67 // | |
68 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating | |
69 // where oops are located in instances of this klass. | |
70 | |
71 | |
72 // forward declaration for class -- see below for definition | |
73 class SuperTypeClosure; | |
74 class OopMapBlock; | |
75 class JNIid; | |
76 class jniIdMapBase; | |
77 class BreakpointInfo; | |
78 class fieldDescriptor; | |
79 class DepChange; | |
80 class nmethodBucket; | |
81 class PreviousVersionNode; | |
82 class JvmtiCachedClassFieldMap; | |
83 | |
84 // This is used in iterators below. | |
85 class FieldClosure: public StackObj { | |
86 public: | |
87 virtual void do_field(fieldDescriptor* fd) = 0; | |
88 }; | |
89 | |
90 #ifndef PRODUCT | |
91 // Print fields. | |
92 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. | |
93 class FieldPrinter: public FieldClosure { | |
94 oop _obj; | |
95 outputStream* _st; | |
96 public: | |
97 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} | |
98 void do_field(fieldDescriptor* fd); | |
99 }; | |
100 #endif // !PRODUCT | |
101 | |
102 class instanceKlass: public Klass { | |
103 friend class VMStructs; | |
104 public: | |
105 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description | |
106 // of the class loading & initialization procedure, and the use of the states. | |
107 enum ClassState { | |
108 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. | |
109 allocated, // allocated (but not yet linked) | |
110 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
111 linked, // successfully linked/verified (but not initialized yet) | |
112 being_initialized, // currently running class initializer | |
113 fully_initialized, // initialized (successfull final state) | |
114 initialization_error // error happened during initialization | |
115 }; | |
116 | |
117 public: | |
118 oop* oop_block_beg() const { return adr_array_klasses(); } | |
119 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } | |
120 | |
121 enum { | |
122 implementors_limit = 2 // how many implems can we track? | |
123 }; | |
124 | |
125 protected: | |
126 // | |
127 // The oop block. See comment in klass.hpp before making changes. | |
128 // | |
129 | |
130 // Array classes holding elements of this class. | |
131 klassOop _array_klasses; | |
132 // Method array. | |
133 objArrayOop _methods; | |
134 // Int array containing the original order of method in the class file (for | |
135 // JVMTI). | |
136 typeArrayOop _method_ordering; | |
137 // Interface (klassOops) this class declares locally to implement. | |
138 objArrayOop _local_interfaces; | |
139 // Interface (klassOops) this class implements transitively. | |
140 objArrayOop _transitive_interfaces; | |
141 // Instance and static variable information, 5-tuples of shorts [access, name | |
142 // index, sig index, initval index, offset]. | |
143 typeArrayOop _fields; | |
144 // Constant pool for this class. | |
145 constantPoolOop _constants; | |
146 // Class loader used to load this class, NULL if VM loader used. | |
147 oop _class_loader; | |
148 // Protection domain. | |
149 oop _protection_domain; | |
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150 // Host class, which grants its access privileges to this class also. |
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151 // This is only non-null for an anonymous class (AnonymousClasses enabled). |
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152 // The host class is either named, or a previously loaded anonymous class. |
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153 klassOop _host_klass; |
0 | 154 // Class signers. |
155 objArrayOop _signers; | |
156 // Name of source file containing this klass, NULL if not specified. | |
157 symbolOop _source_file_name; | |
158 // the source debug extension for this klass, NULL if not specified. | |
159 symbolOop _source_debug_extension; | |
160 // inner_classes attribute. | |
161 typeArrayOop _inner_classes; | |
162 // Implementors of this interface (not valid if it overflows) | |
163 klassOop _implementors[implementors_limit]; | |
164 // Generic signature, or null if none. | |
165 symbolOop _generic_signature; | |
166 // Annotations for this class, or null if none. | |
167 typeArrayOop _class_annotations; | |
168 // Annotation objects (byte arrays) for fields, or null if no annotations. | |
169 // Indices correspond to entries (not indices) in fields array. | |
170 objArrayOop _fields_annotations; | |
171 // Annotation objects (byte arrays) for methods, or null if no annotations. | |
172 // Index is the idnum, which is initially the same as the methods array index. | |
173 objArrayOop _methods_annotations; | |
174 // Annotation objects (byte arrays) for methods' parameters, or null if no | |
175 // such annotations. | |
176 // Index is the idnum, which is initially the same as the methods array index. | |
177 objArrayOop _methods_parameter_annotations; | |
178 // Annotation objects (byte arrays) for methods' default values, or null if no | |
179 // such annotations. | |
180 // Index is the idnum, which is initially the same as the methods array index. | |
181 objArrayOop _methods_default_annotations; | |
182 | |
183 // | |
184 // End of the oop block. | |
185 // | |
186 | |
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187 // Number of heapOopSize words used by non-static fields in this klass |
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188 // (including inherited fields but after header_size()). |
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189 int _nonstatic_field_size; |
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190 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
0 | 191 int _static_oop_field_size;// number of static oop fields in this klass |
192 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass | |
193 bool _is_marked_dependent; // used for marking during flushing and deoptimization | |
194 bool _rewritten; // methods rewritten. | |
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195 bool _has_nonstatic_fields; // for sizing with UseCompressedOops |
0 | 196 u2 _minor_version; // minor version number of class file |
197 u2 _major_version; // major version number of class file | |
198 ClassState _init_state; // state of class | |
199 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
200 int _vtable_len; // length of Java vtable (in words) | |
201 int _itable_len; // length of Java itable (in words) | |
202 ReferenceType _reference_type; // reference type | |
203 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
204 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
205 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
206 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
207 nmethodBucket* _dependencies; // list of dependent nmethods | |
208 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
209 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop | |
210 int _nof_implementors; // No of implementors of this interface (zero if not an interface) | |
211 // Array of interesting part(s) of the previous version(s) of this | |
212 // instanceKlass. See PreviousVersionWalker below. | |
213 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
214 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none | |
215 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none | |
216 // JVMTI fields can be moved to their own structure - see 6315920 | |
217 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
218 jint _cached_class_file_len; // JVMTI: length of above | |
219 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
220 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change | |
221 | |
222 // embedded Java vtable follows here | |
223 // embedded Java itables follows here | |
224 // embedded static fields follows here | |
225 // embedded nonstatic oop-map blocks follows here | |
226 | |
227 friend class instanceKlassKlass; | |
228 friend class SystemDictionary; | |
229 | |
230 public: | |
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231 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } |
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232 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } |
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233 |
0 | 234 // field sizes |
235 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
236 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
237 | |
238 int static_field_size() const { return _static_field_size; } | |
239 void set_static_field_size(int size) { _static_field_size = size; } | |
240 | |
241 int static_oop_field_size() const { return _static_oop_field_size; } | |
242 void set_static_oop_field_size(int size) { _static_oop_field_size = size; } | |
243 | |
244 // Java vtable | |
245 int vtable_length() const { return _vtable_len; } | |
246 void set_vtable_length(int len) { _vtable_len = len; } | |
247 | |
248 // Java itable | |
249 int itable_length() const { return _itable_len; } | |
250 void set_itable_length(int len) { _itable_len = len; } | |
251 | |
252 // array klasses | |
253 klassOop array_klasses() const { return _array_klasses; } | |
254 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } | |
255 | |
256 // methods | |
257 objArrayOop methods() const { return _methods; } | |
258 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } | |
259 methodOop method_with_idnum(int idnum); | |
260 | |
261 // method ordering | |
262 typeArrayOop method_ordering() const { return _method_ordering; } | |
263 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } | |
264 | |
265 // interfaces | |
266 objArrayOop local_interfaces() const { return _local_interfaces; } | |
267 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } | |
268 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } | |
269 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } | |
270 | |
271 // fields | |
272 // Field info extracted from the class file and stored | |
273 // as an array of 7 shorts | |
274 enum FieldOffset { | |
275 access_flags_offset = 0, | |
276 name_index_offset = 1, | |
277 signature_index_offset = 2, | |
278 initval_index_offset = 3, | |
279 low_offset = 4, | |
280 high_offset = 5, | |
281 generic_signature_offset = 6, | |
282 next_offset = 7 | |
283 }; | |
284 | |
285 typeArrayOop fields() const { return _fields; } | |
286 int offset_from_fields( int index ) const { | |
287 return build_int_from_shorts( fields()->ushort_at(index + low_offset), | |
288 fields()->ushort_at(index + high_offset) ); | |
289 } | |
290 | |
291 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } | |
292 | |
293 // inner classes | |
294 typeArrayOop inner_classes() const { return _inner_classes; } | |
295 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } | |
296 | |
297 enum InnerClassAttributeOffset { | |
298 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
299 inner_class_inner_class_info_offset = 0, | |
300 inner_class_outer_class_info_offset = 1, | |
301 inner_class_inner_name_offset = 2, | |
302 inner_class_access_flags_offset = 3, | |
303 inner_class_next_offset = 4 | |
304 }; | |
305 | |
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306 // method override check |
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307 bool is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS); |
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308 |
0 | 309 // package |
310 bool is_same_class_package(klassOop class2); | |
311 bool is_same_class_package(oop classloader2, symbolOop classname2); | |
312 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2); | |
313 | |
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314 // find an enclosing class (defined where original code was, in jvm.cpp!) |
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315 klassOop compute_enclosing_class(symbolOop& simple_name_result, TRAPS) { |
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316 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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317 return compute_enclosing_class_impl(self, simple_name_result, THREAD); |
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318 } |
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319 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, |
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320 symbolOop& simple_name_result, TRAPS); |
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321 |
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322 // tell if two classes have the same enclosing class (at package level) |
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323 bool is_same_package_member(klassOop class2, TRAPS) { |
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324 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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325 return is_same_package_member_impl(self, class2, THREAD); |
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326 } |
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327 static bool is_same_package_member_impl(instanceKlassHandle self, |
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328 klassOop class2, TRAPS); |
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329 |
0 | 330 // initialization state |
331 bool is_loaded() const { return _init_state >= loaded; } | |
332 bool is_linked() const { return _init_state >= linked; } | |
333 bool is_initialized() const { return _init_state == fully_initialized; } | |
334 bool is_not_initialized() const { return _init_state < being_initialized; } | |
335 bool is_being_initialized() const { return _init_state == being_initialized; } | |
336 bool is_in_error_state() const { return _init_state == initialization_error; } | |
337 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
338 int get_init_state() { return _init_state; } // Useful for debugging | |
339 bool is_rewritten() const { return _rewritten; } | |
340 | |
341 // marking | |
342 bool is_marked_dependent() const { return _is_marked_dependent; } | |
343 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } | |
344 | |
345 // initialization (virtuals from Klass) | |
346 bool should_be_initialized() const; // means that initialize should be called | |
347 void initialize(TRAPS); | |
348 void link_class(TRAPS); | |
349 bool link_class_or_fail(TRAPS); // returns false on failure | |
350 void unlink_class(); | |
351 void rewrite_class(TRAPS); | |
352 methodOop class_initializer(); | |
353 | |
354 // set the class to initialized if no static initializer is present | |
355 void eager_initialize(Thread *thread); | |
356 | |
357 // reference type | |
358 ReferenceType reference_type() const { return _reference_type; } | |
359 void set_reference_type(ReferenceType t) { _reference_type = t; } | |
360 | |
361 // find local field, returns true if found | |
362 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
363 // find field in direct superinterfaces, returns the interface in which the field is defined | |
364 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
365 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
366 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
367 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
368 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const; | |
369 | |
370 // find a non-static or static field given its offset within the class. | |
371 bool contains_field_offset(int offset) { | |
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372 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
0 | 373 } |
374 | |
375 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
376 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
377 | |
378 // find a local method (returns NULL if not found) | |
379 methodOop find_method(symbolOop name, symbolOop signature) const; | |
380 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature); | |
381 | |
382 // lookup operation (returns NULL if not found) | |
383 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; | |
384 | |
385 // lookup a method in all the interfaces that this class implements | |
386 // (returns NULL if not found) | |
387 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const; | |
388 | |
389 // constant pool | |
390 constantPoolOop constants() const { return _constants; } | |
391 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } | |
392 | |
393 // class loader | |
394 oop class_loader() const { return _class_loader; } | |
395 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } | |
396 | |
397 // protection domain | |
398 oop protection_domain() { return _protection_domain; } | |
399 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } | |
400 | |
431
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401 // host class |
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402 oop host_klass() const { return _host_klass; } |
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403 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } |
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404 bool is_anonymous() const { return _host_klass != NULL; } |
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405 |
0 | 406 // signers |
407 objArrayOop signers() const { return _signers; } | |
408 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } | |
409 | |
410 // source file name | |
411 symbolOop source_file_name() const { return _source_file_name; } | |
412 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); } | |
413 | |
414 // minor and major version numbers of class file | |
415 u2 minor_version() const { return _minor_version; } | |
416 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
417 u2 major_version() const { return _major_version; } | |
418 void set_major_version(u2 major_version) { _major_version = major_version; } | |
419 | |
420 // source debug extension | |
421 symbolOop source_debug_extension() const { return _source_debug_extension; } | |
422 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); } | |
423 | |
424 // nonstatic oop-map blocks | |
425 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
426 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; } | |
427 | |
428 // RedefineClasses() support for previous versions: | |
429 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
430 int emcp_method_count); | |
431 bool has_previous_version() const; | |
432 void init_previous_versions() { | |
433 _previous_versions = NULL; | |
434 } | |
435 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
436 return _previous_versions; | |
437 } | |
438 | |
439 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation | |
440 void set_cached_class_file(unsigned char *class_file_bytes, | |
441 jint class_file_len) { _cached_class_file_len = class_file_len; | |
442 _cached_class_file_bytes = class_file_bytes; } | |
443 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
444 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
445 | |
446 // JVMTI: Support for caching of field indices, types, and offsets | |
447 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
448 _jvmti_cached_class_field_map = descriptor; | |
449 } | |
450 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
451 return _jvmti_cached_class_field_map; | |
452 } | |
453 | |
454 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available | |
455 inline u2 next_method_idnum(); | |
456 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
457 | |
458 // generics support | |
459 symbolOop generic_signature() const { return _generic_signature; } | |
460 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); } | |
461 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } | |
462 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } | |
463 void set_enclosing_method_indices(u2 class_index, | |
464 u2 method_index) { _enclosing_method_class_index = class_index; | |
465 _enclosing_method_method_index = method_index; } | |
466 | |
467 // jmethodID support | |
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468 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum, |
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469 jmethodID new_id, jmethodID* new_jmeths); |
0 | 470 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h); |
471 jmethodID jmethod_id_or_null(methodOop method); | |
472 | |
473 // cached itable index support | |
474 void set_cached_itable_index(size_t idnum, int index); | |
475 int cached_itable_index(size_t idnum); | |
476 | |
477 // annotations support | |
478 typeArrayOop class_annotations() const { return _class_annotations; } | |
479 objArrayOop fields_annotations() const { return _fields_annotations; } | |
480 objArrayOop methods_annotations() const { return _methods_annotations; } | |
481 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } | |
482 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } | |
483 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } | |
484 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } | |
485 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } | |
486 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } | |
487 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } | |
488 typeArrayOop get_method_annotations_of(int idnum) | |
489 { return get_method_annotations_from(idnum, _methods_annotations); } | |
490 typeArrayOop get_method_parameter_annotations_of(int idnum) | |
491 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } | |
492 typeArrayOop get_method_default_annotations_of(int idnum) | |
493 { return get_method_annotations_from(idnum, _methods_default_annotations); } | |
494 void set_method_annotations_of(int idnum, typeArrayOop anno) | |
495 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
496 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) | |
497 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
498 void set_method_default_annotations_of(int idnum, typeArrayOop anno) | |
499 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
500 | |
501 // allocation | |
502 DEFINE_ALLOCATE_PERMANENT(instanceKlass); | |
503 instanceOop allocate_instance(TRAPS); | |
504 instanceOop allocate_permanent_instance(TRAPS); | |
505 | |
506 // additional member function to return a handle | |
507 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
508 | |
509 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
510 // Helper function | |
511 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
512 | |
513 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
514 // if not, throw either an Error or an Exception. | |
515 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
516 | |
517 // initialization | |
518 void call_class_initializer(TRAPS); | |
519 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
520 | |
521 // OopMapCache support | |
522 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
523 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
524 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
525 | |
526 // JNI identifier support (for static fields - for jni performance) | |
527 JNIid* jni_ids() { return _jni_ids; } | |
528 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
529 JNIid* jni_id_for(int offset); | |
530 | |
531 // maintenance of deoptimization dependencies | |
532 int mark_dependent_nmethods(DepChange& changes); | |
533 void add_dependent_nmethod(nmethod* nm); | |
534 void remove_dependent_nmethod(nmethod* nm); | |
535 | |
536 // On-stack replacement support | |
537 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
538 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
539 void add_osr_nmethod(nmethod* n); | |
540 void remove_osr_nmethod(nmethod* n); | |
541 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const; | |
542 | |
543 // Breakpoint support (see methods on methodOop for details) | |
544 BreakpointInfo* breakpoints() const { return _breakpoints; }; | |
545 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
546 | |
547 // support for stub routines | |
548 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } | |
549 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } | |
550 | |
551 // subclass/subinterface checks | |
552 bool implements_interface(klassOop k) const; | |
553 | |
554 // Access to implementors of an interface. We only store the count | |
555 // of implementors, and in case, there are only a few | |
556 // implementors, we store them in a short list. | |
557 // This accessor returns NULL if we walk off the end of the list. | |
558 klassOop implementor(int i) const { | |
559 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; | |
560 } | |
561 int nof_implementors() const { return _nof_implementors; } | |
562 void add_implementor(klassOop k); // k is a new class that implements this interface | |
563 void init_implementor(); // initialize | |
564 | |
565 // link this class into the implementors list of every interface it implements | |
566 void process_interfaces(Thread *thread); | |
567 | |
568 // virtual operations from Klass | |
569 bool is_leaf_class() const { return _subklass == NULL; } | |
570 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); | |
571 bool compute_is_subtype_of(klassOop k); | |
572 bool can_be_primary_super_slow() const; | |
573 klassOop java_super() const { return super(); } | |
574 int oop_size(oop obj) const { return size_helper(); } | |
575 int klass_oop_size() const { return object_size(); } | |
576 bool oop_is_instance_slow() const { return true; } | |
577 | |
578 // Iterators | |
579 void do_local_static_fields(FieldClosure* cl); | |
580 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
581 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
582 | |
583 void methods_do(void f(methodOop method)); | |
584 void array_klasses_do(void f(klassOop k)); | |
585 void with_array_klasses_do(void f(klassOop k)); | |
586 bool super_types_do(SuperTypeClosure* blk); | |
587 | |
588 // Casting from klassOop | |
589 static instanceKlass* cast(klassOop k) { | |
590 Klass* kp = k->klass_part(); | |
591 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); | |
592 return (instanceKlass*) kp; | |
593 } | |
594 | |
595 // Sizing (in words) | |
596 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } | |
597 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); } | |
598 static int vtable_start_offset() { return header_size(); } | |
599 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } | |
600 static int object_size(int extra) { return align_object_size(header_size() + extra); } | |
601 | |
602 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } | |
603 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } | |
604 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } | |
605 | |
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606 // Static field offset is an offset into the Heap, should be converted by |
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607 // based on UseCompressedOop for traversal |
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608 HeapWord* start_of_static_fields() const { |
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609 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length())); |
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610 } |
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611 |
0 | 612 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } |
613 | |
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614 int offset_of_static_fields() const { |
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615 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); |
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616 } |
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617 |
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618 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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619 return (OopMapBlock*) (start_of_static_fields() + static_field_size()); |
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620 } |
0 | 621 |
622 // Allocation profiling support | |
623 juint alloc_size() const { return _alloc_count * size_helper(); } | |
624 void set_alloc_size(juint n) {} | |
625 | |
626 // Use this to return the size of an instance in heap words: | |
627 int size_helper() const { | |
628 return layout_helper_to_size_helper(layout_helper()); | |
629 } | |
630 | |
631 // This bit is initialized in classFileParser.cpp. | |
632 // It is false under any of the following conditions: | |
633 // - the class is abstract (including any interface) | |
634 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
635 // - the class size is larger than FastAllocateSizeLimit | |
636 // - the class is java/lang/Class, which cannot be allocated directly | |
637 bool can_be_fastpath_allocated() const { | |
638 return !layout_helper_needs_slow_path(layout_helper()); | |
639 } | |
640 | |
641 // Java vtable/itable | |
642 klassVtable* vtable() const; // return new klassVtable wrapper | |
643 inline methodOop method_at_vtable(int index); | |
644 klassItable* itable() const; // return new klassItable wrapper | |
645 methodOop method_at_itable(klassOop holder, int index, TRAPS); | |
646 | |
647 // Garbage collection | |
648 void oop_follow_contents(oop obj); | |
649 void follow_static_fields(); | |
650 void adjust_static_fields(); | |
651 int oop_adjust_pointers(oop obj); | |
652 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } | |
653 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. | |
654 | |
655 void follow_weak_klass_links( | |
656 BoolObjectClosure* is_alive, OopClosure* keep_alive); | |
657 void release_C_heap_structures(); | |
658 | |
659 // Parallel Scavenge and Parallel Old | |
660 PARALLEL_GC_DECLS | |
661 | |
662 #ifndef SERIALGC | |
663 // Parallel Scavenge | |
664 void copy_static_fields(PSPromotionManager* pm); | |
665 void push_static_fields(PSPromotionManager* pm); | |
666 | |
667 // Parallel Old | |
668 void follow_static_fields(ParCompactionManager* cm); | |
669 void copy_static_fields(ParCompactionManager* cm); | |
670 void update_static_fields(); | |
671 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr); | |
672 #endif // SERIALGC | |
673 | |
674 // Naming | |
675 char* signature_name() const; | |
676 | |
677 // Iterators | |
678 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
679 return oop_oop_iterate_v(obj, blk); | |
680 } | |
681 | |
682 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
683 return oop_oop_iterate_v_m(obj, blk, mr); | |
684 } | |
685 | |
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686 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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687 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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688 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
0 | 689 MemRegion mr); |
690 | |
691 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
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692 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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693 |
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694 #ifndef SERIALGC |
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695 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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696 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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697 |
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698 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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699 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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700 #endif // !SERIALGC |
0 | 701 |
702 void iterate_static_fields(OopClosure* closure); | |
703 void iterate_static_fields(OopClosure* closure, MemRegion mr); | |
704 | |
705 private: | |
706 // initialization state | |
707 #ifdef ASSERT | |
708 void set_init_state(ClassState state); | |
709 #else | |
710 void set_init_state(ClassState state) { _init_state = state; } | |
711 #endif | |
712 void set_rewritten() { _rewritten = true; } | |
713 void set_init_thread(Thread *thread) { _init_thread = thread; } | |
714 | |
715 u2 idnum_allocated_count() const { return _idnum_allocated_count; } | |
716 jmethodID* methods_jmethod_ids_acquire() const | |
717 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
718 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
719 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
720 | |
721 int* methods_cached_itable_indices_acquire() const | |
722 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
723 void release_set_methods_cached_itable_indices(int* indices) | |
724 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
725 | |
726 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); | |
727 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } | |
728 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); | |
729 | |
730 // Offsets for memory management | |
731 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} | |
732 oop* adr_methods() const { return (oop*)&this->_methods;} | |
733 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} | |
734 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} | |
735 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} | |
736 oop* adr_fields() const { return (oop*)&this->_fields;} | |
737 oop* adr_constants() const { return (oop*)&this->_constants;} | |
738 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} | |
739 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
431
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740 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} |
0 | 741 oop* adr_signers() const { return (oop*)&this->_signers;} |
742 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;} | |
743 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;} | |
744 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} | |
745 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} | |
746 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;} | |
747 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} | |
748 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} | |
749 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} | |
750 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} | |
751 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} | |
752 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} | |
753 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} | |
754 | |
755 // Static methods that are used to implement member methods where an exposed this pointer | |
756 // is needed due to possible GCs | |
757 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
758 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
759 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
760 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
761 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
762 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
763 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); | |
764 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); | |
765 /* jni_id_for_impl for jfieldID only */ | |
766 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
767 | |
768 // Returns the array class for the n'th dimension | |
769 klassOop array_klass_impl(bool or_null, int n, TRAPS); | |
770 | |
771 // Returns the array class with this class as element type | |
772 klassOop array_klass_impl(bool or_null, TRAPS); | |
773 | |
774 public: | |
775 // sharing support | |
776 virtual void remove_unshareable_info(); | |
777 void field_names_and_sigs_iterate(OopClosure* closure); | |
778 | |
779 // jvm support | |
780 jint compute_modifier_flags(TRAPS) const; | |
781 | |
782 public: | |
783 // JVMTI support | |
784 jint jvmti_class_status() const; | |
785 | |
786 #ifndef PRODUCT | |
787 public: | |
788 // Printing | |
789 void oop_print_on (oop obj, outputStream* st); | |
790 void oop_print_value_on(oop obj, outputStream* st); | |
791 | |
792 void print_dependent_nmethods(bool verbose = false); | |
793 bool is_dependent_nmethod(nmethod* nm); | |
794 #endif | |
795 | |
796 public: | |
797 // Verification | |
798 const char* internal_name() const; | |
799 void oop_verify_on(oop obj, outputStream* st); | |
800 | |
801 #ifndef PRODUCT | |
802 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; | |
803 #endif | |
804 }; | |
805 | |
806 inline methodOop instanceKlass::method_at_vtable(int index) { | |
807 #ifndef PRODUCT | |
808 assert(index >= 0, "valid vtable index"); | |
809 if (DebugVtables) { | |
810 verify_vtable_index(index); | |
811 } | |
812 #endif | |
813 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
814 return ve[index].method(); | |
815 } | |
816 | |
817 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { | |
818 if (annos == NULL || annos->length() <= idnum) { | |
819 return NULL; | |
820 } | |
821 return typeArrayOop(annos->obj_at(idnum)); | |
822 } | |
823 | |
824 // for adding methods | |
825 // UNSET_IDNUM return means no more ids available | |
826 inline u2 instanceKlass::next_method_idnum() { | |
827 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { | |
828 return constMethodOopDesc::UNSET_IDNUM; // no more ids available | |
829 } else { | |
830 return _idnum_allocated_count++; | |
831 } | |
832 } | |
833 | |
834 | |
835 // ValueObjs embedded in klass. Describes where oops are located in instances of this klass. | |
836 | |
837 class OopMapBlock VALUE_OBJ_CLASS_SPEC { | |
838 private: | |
839 jushort _offset; // Offset of first oop in oop-map block | |
840 jushort _length; // Length of oop-map block | |
841 public: | |
842 // Accessors | |
843 jushort offset() const { return _offset; } | |
844 void set_offset(jushort offset) { _offset = offset; } | |
845 | |
846 jushort length() const { return _length; } | |
847 void set_length(jushort length) { _length = length; } | |
848 }; | |
849 | |
850 /* JNIid class for jfieldIDs only */ | |
851 class JNIid: public CHeapObj { | |
852 friend class VMStructs; | |
853 private: | |
854 klassOop _holder; | |
855 JNIid* _next; | |
856 int _offset; | |
857 #ifdef ASSERT | |
858 bool _is_static_field_id; | |
859 #endif | |
860 | |
861 public: | |
862 // Accessors | |
863 klassOop holder() const { return _holder; } | |
864 int offset() const { return _offset; } | |
865 JNIid* next() { return _next; } | |
866 // Constructor | |
867 JNIid(klassOop holder, int offset, JNIid* next); | |
868 // Identifier lookup | |
869 JNIid* find(int offset); | |
870 | |
871 // Garbage collection support | |
872 oop* holder_addr() { return (oop*)&_holder; } | |
873 void oops_do(OopClosure* f); | |
874 static void deallocate(JNIid* id); | |
875 // Debugging | |
876 #ifdef ASSERT | |
877 bool is_static_field_id() const { return _is_static_field_id; } | |
878 void set_is_static_field_id() { _is_static_field_id = true; } | |
879 #endif | |
880 void verify(klassOop holder); | |
881 }; | |
882 | |
883 | |
884 // If breakpoints are more numerous than just JVMTI breakpoints, | |
885 // consider compressing this data structure. | |
886 // It is currently a simple linked list defined in methodOop.hpp. | |
887 | |
888 class BreakpointInfo; | |
889 | |
890 | |
891 // A collection point for interesting information about the previous | |
892 // version(s) of an instanceKlass. This class uses weak references to | |
893 // the information so that the information may be collected as needed | |
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894 // by the system. If the information is shared, then a regular |
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895 // reference must be used because a weak reference would be seen as |
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896 // collectible. A GrowableArray of PreviousVersionNodes is attached |
0 | 897 // to the instanceKlass as needed. See PreviousVersionWalker below. |
898 class PreviousVersionNode : public CHeapObj { | |
899 private: | |
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900 // A shared ConstantPool is never collected so we'll always have |
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901 // a reference to it so we can update items in the cache. We'll |
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902 // have a weak reference to a non-shared ConstantPool until all |
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903 // of the methods (EMCP or obsolete) have been collected; the |
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904 // non-shared ConstantPool becomes collectible at that point. |
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905 jobject _prev_constant_pool; // regular or weak reference |
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906 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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907 |
0 | 908 // If the previous version of the instanceKlass doesn't have any |
909 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the | |
910 // EMCP methods have been collected, then _prev_EMCP_methods can | |
911 // have a length of zero. | |
912 GrowableArray<jweak>* _prev_EMCP_methods; | |
913 | |
914 public: | |
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915 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, |
0 | 916 GrowableArray<jweak>* prev_EMCP_methods); |
917 ~PreviousVersionNode(); | |
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918 jobject prev_constant_pool() const { |
0 | 919 return _prev_constant_pool; |
920 } | |
921 GrowableArray<jweak>* prev_EMCP_methods() const { | |
922 return _prev_EMCP_methods; | |
923 } | |
924 }; | |
925 | |
926 | |
927 // A Handle-ized version of PreviousVersionNode. | |
928 class PreviousVersionInfo : public ResourceObj { | |
929 private: | |
930 constantPoolHandle _prev_constant_pool_handle; | |
931 // If the previous version of the instanceKlass doesn't have any | |
932 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the | |
933 // methods cannot be collected while we hold a handle, | |
934 // _prev_EMCP_methods should never have a length of zero. | |
935 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
936 | |
937 public: | |
938 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
939 ~PreviousVersionInfo(); | |
940 constantPoolHandle prev_constant_pool_handle() const { | |
941 return _prev_constant_pool_handle; | |
942 } | |
943 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
944 return _prev_EMCP_method_handles; | |
945 } | |
946 }; | |
947 | |
948 | |
949 // Helper object for walking previous versions. This helper cleans up | |
950 // the Handles that it allocates when the helper object is destroyed. | |
951 // The PreviousVersionInfo object returned by next_previous_version() | |
952 // is only valid until a subsequent call to next_previous_version() or | |
953 // the helper object is destroyed. | |
954 class PreviousVersionWalker : public StackObj { | |
955 private: | |
956 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
957 int _current_index; | |
958 // Fields for cleaning up when we are done walking the previous versions: | |
959 // A HandleMark for the PreviousVersionInfo handles: | |
960 HandleMark _hm; | |
961 | |
962 // It would be nice to have a ResourceMark field in this helper also, | |
963 // but the ResourceMark code says to be careful to delete handles held | |
964 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
965 // can't guarantee the order in which the fields are destroyed, we | |
966 // have to let the creator of the PreviousVersionWalker object do | |
967 // the right thing. Also, adding a ResourceMark here causes an | |
968 // include loop. | |
969 | |
970 // A pointer to the current info object so we can handle the deletes. | |
971 PreviousVersionInfo * _current_p; | |
972 | |
973 public: | |
974 PreviousVersionWalker(instanceKlass *ik); | |
975 ~PreviousVersionWalker(); | |
976 | |
977 // Return the interesting information for the next previous version | |
978 // of the klass. Returns NULL if there are no more previous versions. | |
979 PreviousVersionInfo* next_previous_version(); | |
980 }; |