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--- old/src/share/vm/oops/instanceKlass.hpp
+++ new/src/share/vm/oops/instanceKlass.hpp
1 1 /*
2 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 4 *
5 5 * This code is free software; you can redistribute it and/or modify it
6 6 * under the terms of the GNU General Public License version 2 only, as
7 7 * published by the Free Software Foundation.
8 8 *
9 9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 12 * version 2 for more details (a copy is included in the LICENSE file that
13 13 * accompanied this code).
14 14 *
15 15 * You should have received a copy of the GNU General Public License version
16 16 * 2 along with this work; if not, write to the Free Software Foundation,
17 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 18 *
19 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 20 * or visit www.oracle.com if you need additional information or have any
21 21 * questions.
22 22 *
23 23 */
24 24
25 25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27 27
28 28 #include "oops/constMethodOop.hpp"
29 29 #include "oops/constantPoolOop.hpp"
30 30 #include "oops/instanceOop.hpp"
31 31 #include "oops/klassOop.hpp"
32 32 #include "oops/klassVtable.hpp"
33 33 #include "oops/objArrayOop.hpp"
34 34 #include "runtime/handles.hpp"
35 35 #include "runtime/os.hpp"
36 36 #include "utilities/accessFlags.hpp"
37 37 #include "utilities/bitMap.inline.hpp"
38 38
39 39 // An instanceKlass is the VM level representation of a Java class.
40 40 // It contains all information needed for at class at execution runtime.
41 41
42 42 // instanceKlass layout:
43 43 // [header ] klassOop
44 44 // [klass pointer ] klassOop
45 45 // [C++ vtbl pointer ] Klass
46 46 // [subtype cache ] Klass
47 47 // [instance size ] Klass
48 48 // [java mirror ] Klass
49 49 // [super ] Klass
50 50 // [access_flags ] Klass
51 51 // [name ] Klass
52 52 // [first subklass ] Klass
53 53 // [next sibling ] Klass
54 54 // [array klasses ]
55 55 // [methods ]
56 56 // [local interfaces ]
57 57 // [transitive interfaces ]
58 58 // [number of implementors ]
59 59 // [implementors ] klassOop[2]
60 60 // [fields ]
61 61 // [constants ]
62 62 // [class loader ]
63 63 // [protection domain ]
64 64 // [signers ]
65 65 // [source file name ]
66 66 // [inner classes ]
67 67 // [static field size ]
68 68 // [nonstatic field size ]
69 69 // [static oop fields size ]
70 70 // [nonstatic oop maps size ]
71 71 // [has finalize method ]
72 72 // [deoptimization mark bit ]
73 73 // [initialization state ]
74 74 // [initializing thread ]
75 75 // [Java vtable length ]
76 76 // [oop map cache (stack maps) ]
77 77 // [EMBEDDED Java vtable ] size in words = vtable_len
78 78 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
79 79 //
80 80 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
81 81 // where oops are located in instances of this klass.
82 82
83 83
84 84 // forward declaration for class -- see below for definition
85 85 class SuperTypeClosure;
86 86 class JNIid;
87 87 class jniIdMapBase;
88 88 class BreakpointInfo;
89 89 class fieldDescriptor;
90 90 class DepChange;
91 91 class nmethodBucket;
92 92 class PreviousVersionNode;
93 93 class JvmtiCachedClassFieldMap;
94 94
95 95 // This is used in iterators below.
96 96 class FieldClosure: public StackObj {
97 97 public:
98 98 virtual void do_field(fieldDescriptor* fd) = 0;
99 99 };
100 100
101 101 #ifndef PRODUCT
102 102 // Print fields.
103 103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
104 104 class FieldPrinter: public FieldClosure {
105 105 oop _obj;
106 106 outputStream* _st;
107 107 public:
108 108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
109 109 void do_field(fieldDescriptor* fd);
110 110 };
111 111 #endif // !PRODUCT
112 112
113 113 // ValueObjs embedded in klass. Describes where oops are located in instances of
114 114 // this klass.
115 115 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
116 116 public:
117 117 // Byte offset of the first oop mapped by this block.
118 118 int offset() const { return _offset; }
119 119 void set_offset(int offset) { _offset = offset; }
120 120
121 121 // Number of oops in this block.
122 122 uint count() const { return _count; }
123 123 void set_count(uint count) { _count = count; }
124 124
125 125 // sizeof(OopMapBlock) in HeapWords.
126 126 static const int size_in_words() {
127 127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
128 128 LogHeapWordSize;
129 129 }
130 130
131 131 private:
132 132 int _offset;
133 133 uint _count;
134 134 };
135 135
136 136 class instanceKlass: public Klass {
137 137 friend class VMStructs;
138 138 public:
139 139 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
140 140 // of the class loading & initialization procedure, and the use of the states.
141 141 enum ClassState {
142 142 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
143 143 allocated, // allocated (but not yet linked)
144 144 loaded, // loaded and inserted in class hierarchy (but not linked yet)
145 145 linked, // successfully linked/verified (but not initialized yet)
146 146 being_initialized, // currently running class initializer
147 147 fully_initialized, // initialized (successfull final state)
148 148 initialization_error // error happened during initialization
149 149 };
150 150
151 151 public:
152 152 oop* oop_block_beg() const { return adr_array_klasses(); }
153 153 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
154 154
155 155 enum {
156 156 implementors_limit = 2 // how many implems can we track?
157 157 };
158 158
159 159 protected:
160 160 //
161 161 // The oop block. See comment in klass.hpp before making changes.
162 162 //
163 163
164 164 // Array classes holding elements of this class.
165 165 klassOop _array_klasses;
166 166 // Method array.
167 167 objArrayOop _methods;
168 168 // Int array containing the original order of method in the class file (for
169 169 // JVMTI).
170 170 typeArrayOop _method_ordering;
171 171 // Interface (klassOops) this class declares locally to implement.
172 172 objArrayOop _local_interfaces;
173 173 // Interface (klassOops) this class implements transitively.
174 174 objArrayOop _transitive_interfaces;
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175 175 // Instance and static variable information, 5-tuples of shorts [access, name
176 176 // index, sig index, initval index, offset].
177 177 typeArrayOop _fields;
178 178 // Constant pool for this class.
179 179 constantPoolOop _constants;
180 180 // Class loader used to load this class, NULL if VM loader used.
181 181 oop _class_loader;
182 182 // Protection domain.
183 183 oop _protection_domain;
184 184 // Host class, which grants its access privileges to this class also.
185 - // This is only non-null for an anonymous class (AnonymousClasses enabled).
185 + // This is only non-null for an anonymous class (JSR 292 enabled).
186 186 // The host class is either named, or a previously loaded anonymous class.
187 187 klassOop _host_klass;
188 188 // Class signers.
189 189 objArrayOop _signers;
190 190 // inner_classes attribute.
191 191 typeArrayOop _inner_classes;
192 192 // Implementors of this interface (not valid if it overflows)
193 193 klassOop _implementors[implementors_limit];
194 194 // invokedynamic bootstrap method (a java.lang.invoke.MethodHandle)
195 195 oop _bootstrap_method; // AllowTransitionalJSR292 ONLY
196 196 // Annotations for this class, or null if none.
197 197 typeArrayOop _class_annotations;
198 198 // Annotation objects (byte arrays) for fields, or null if no annotations.
199 199 // Indices correspond to entries (not indices) in fields array.
200 200 objArrayOop _fields_annotations;
201 201 // Annotation objects (byte arrays) for methods, or null if no annotations.
202 202 // Index is the idnum, which is initially the same as the methods array index.
203 203 objArrayOop _methods_annotations;
204 204 // Annotation objects (byte arrays) for methods' parameters, or null if no
205 205 // such annotations.
206 206 // Index is the idnum, which is initially the same as the methods array index.
207 207 objArrayOop _methods_parameter_annotations;
208 208 // Annotation objects (byte arrays) for methods' default values, or null if no
209 209 // such annotations.
210 210 // Index is the idnum, which is initially the same as the methods array index.
211 211 objArrayOop _methods_default_annotations;
212 212
213 213 //
214 214 // End of the oop block.
215 215 //
216 216
217 217 // Name of source file containing this klass, NULL if not specified.
218 218 Symbol* _source_file_name;
219 219 // the source debug extension for this klass, NULL if not specified.
220 220 Symbol* _source_debug_extension;
221 221 // Generic signature, or null if none.
222 222 Symbol* _generic_signature;
223 223 // Array name derived from this class which needs unreferencing
224 224 // if this class is unloaded.
225 225 Symbol* _array_name;
226 226
227 227 // Number of heapOopSize words used by non-static fields in this klass
228 228 // (including inherited fields but after header_size()).
229 229 int _nonstatic_field_size;
230 230 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
231 231 int _static_oop_field_count;// number of static oop fields in this klass
232 232 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
233 233 bool _is_marked_dependent; // used for marking during flushing and deoptimization
234 234 bool _rewritten; // methods rewritten.
235 235 bool _has_nonstatic_fields; // for sizing with UseCompressedOops
236 236 bool _should_verify_class; // allow caching of preverification
237 237 u2 _minor_version; // minor version number of class file
238 238 u2 _major_version; // major version number of class file
239 239 ClassState _init_state; // state of class
240 240 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
241 241 int _vtable_len; // length of Java vtable (in words)
242 242 int _itable_len; // length of Java itable (in words)
243 243 ReferenceType _reference_type; // reference type
244 244 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
245 245 JNIid* _jni_ids; // First JNI identifier for static fields in this class
246 246 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
247 247 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
248 248 nmethodBucket* _dependencies; // list of dependent nmethods
249 249 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
250 250 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
251 251 int _nof_implementors; // No of implementors of this interface (zero if not an interface)
252 252 // Array of interesting part(s) of the previous version(s) of this
253 253 // instanceKlass. See PreviousVersionWalker below.
254 254 GrowableArray<PreviousVersionNode *>* _previous_versions;
255 255 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
256 256 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
257 257 // JVMTI fields can be moved to their own structure - see 6315920
258 258 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
259 259 jint _cached_class_file_len; // JVMTI: length of above
260 260 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
261 261 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
262 262
263 263 // embedded Java vtable follows here
264 264 // embedded Java itables follows here
265 265 // embedded static fields follows here
266 266 // embedded nonstatic oop-map blocks follows here
267 267
268 268 friend class instanceKlassKlass;
269 269 friend class SystemDictionary;
270 270
271 271 public:
272 272 bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
273 273 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
274 274
275 275 // field sizes
276 276 int nonstatic_field_size() const { return _nonstatic_field_size; }
277 277 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
278 278
279 279 int static_field_size() const { return _static_field_size; }
280 280 void set_static_field_size(int size) { _static_field_size = size; }
281 281
282 282 int static_oop_field_count() const { return _static_oop_field_count; }
283 283 void set_static_oop_field_count(int size) { _static_oop_field_count = size; }
284 284
285 285 // Java vtable
286 286 int vtable_length() const { return _vtable_len; }
287 287 void set_vtable_length(int len) { _vtable_len = len; }
288 288
289 289 // Java itable
290 290 int itable_length() const { return _itable_len; }
291 291 void set_itable_length(int len) { _itable_len = len; }
292 292
293 293 // array klasses
294 294 klassOop array_klasses() const { return _array_klasses; }
295 295 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
296 296
297 297 // methods
298 298 objArrayOop methods() const { return _methods; }
299 299 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
300 300 methodOop method_with_idnum(int idnum);
301 301
302 302 // method ordering
303 303 typeArrayOop method_ordering() const { return _method_ordering; }
304 304 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
305 305
306 306 // interfaces
307 307 objArrayOop local_interfaces() const { return _local_interfaces; }
308 308 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
309 309 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
310 310 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
311 311
312 312 // fields
313 313 // Field info extracted from the class file and stored
314 314 // as an array of 7 shorts
315 315 enum FieldOffset {
316 316 access_flags_offset = 0,
317 317 name_index_offset = 1,
318 318 signature_index_offset = 2,
319 319 initval_index_offset = 3,
320 320 low_offset = 4,
321 321 high_offset = 5,
322 322 generic_signature_offset = 6,
323 323 next_offset = 7
324 324 };
325 325
326 326 typeArrayOop fields() const { return _fields; }
327 327 int offset_from_fields( int index ) const {
328 328 return build_int_from_shorts( fields()->ushort_at(index + low_offset),
329 329 fields()->ushort_at(index + high_offset) );
330 330 }
331 331
332 332 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
333 333
334 334 // inner classes
335 335 typeArrayOop inner_classes() const { return _inner_classes; }
336 336 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
337 337
338 338 enum InnerClassAttributeOffset {
339 339 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
340 340 inner_class_inner_class_info_offset = 0,
341 341 inner_class_outer_class_info_offset = 1,
342 342 inner_class_inner_name_offset = 2,
343 343 inner_class_access_flags_offset = 3,
344 344 inner_class_next_offset = 4
345 345 };
346 346
347 347 // method override check
348 348 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
349 349
350 350 // package
351 351 bool is_same_class_package(klassOop class2);
352 352 bool is_same_class_package(oop classloader2, Symbol* classname2);
353 353 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
354 354
355 355 // find an enclosing class (defined where original code was, in jvm.cpp!)
356 356 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) {
357 357 instanceKlassHandle self(THREAD, this->as_klassOop());
358 358 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
359 359 }
360 360 static klassOop compute_enclosing_class_impl(instanceKlassHandle self,
361 361 bool* inner_is_member, TRAPS);
362 362
363 363 // tell if two classes have the same enclosing class (at package level)
364 364 bool is_same_package_member(klassOop class2, TRAPS) {
365 365 instanceKlassHandle self(THREAD, this->as_klassOop());
366 366 return is_same_package_member_impl(self, class2, THREAD);
367 367 }
368 368 static bool is_same_package_member_impl(instanceKlassHandle self,
369 369 klassOop class2, TRAPS);
370 370
371 371 // initialization state
372 372 bool is_loaded() const { return _init_state >= loaded; }
373 373 bool is_linked() const { return _init_state >= linked; }
374 374 bool is_initialized() const { return _init_state == fully_initialized; }
375 375 bool is_not_initialized() const { return _init_state < being_initialized; }
376 376 bool is_being_initialized() const { return _init_state == being_initialized; }
377 377 bool is_in_error_state() const { return _init_state == initialization_error; }
378 378 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
379 379 int get_init_state() { return _init_state; } // Useful for debugging
380 380 bool is_rewritten() const { return _rewritten; }
381 381
382 382 // defineClass specified verification
383 383 bool should_verify_class() const { return _should_verify_class; }
384 384 void set_should_verify_class(bool value) { _should_verify_class = value; }
385 385
386 386 // marking
387 387 bool is_marked_dependent() const { return _is_marked_dependent; }
388 388 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
389 389
390 390 // initialization (virtuals from Klass)
391 391 bool should_be_initialized() const; // means that initialize should be called
392 392 void initialize(TRAPS);
393 393 void link_class(TRAPS);
394 394 bool link_class_or_fail(TRAPS); // returns false on failure
395 395 void unlink_class();
396 396 void rewrite_class(TRAPS);
397 397 methodOop class_initializer();
398 398
399 399 // set the class to initialized if no static initializer is present
400 400 void eager_initialize(Thread *thread);
401 401
402 402 // reference type
403 403 ReferenceType reference_type() const { return _reference_type; }
404 404 void set_reference_type(ReferenceType t) { _reference_type = t; }
405 405
406 406 // find local field, returns true if found
407 407 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
408 408 // find field in direct superinterfaces, returns the interface in which the field is defined
409 409 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
410 410 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
411 411 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
412 412 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
413 413 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
414 414
415 415 // find a non-static or static field given its offset within the class.
416 416 bool contains_field_offset(int offset) {
417 417 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
418 418 }
419 419
420 420 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
421 421 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
422 422
423 423 // find a local method (returns NULL if not found)
424 424 methodOop find_method(Symbol* name, Symbol* signature) const;
425 425 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature);
426 426
427 427 // lookup operation (returns NULL if not found)
428 428 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const;
429 429
430 430 // lookup a method in all the interfaces that this class implements
431 431 // (returns NULL if not found)
432 432 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
433 433
434 434 // constant pool
435 435 constantPoolOop constants() const { return _constants; }
436 436 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
437 437
438 438 // class loader
439 439 oop class_loader() const { return _class_loader; }
440 440 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
441 441
442 442 // protection domain
443 443 oop protection_domain() { return _protection_domain; }
444 444 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
445 445
446 446 // host class
447 447 oop host_klass() const { return _host_klass; }
448 448 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
449 449 bool is_anonymous() const { return _host_klass != NULL; }
450 450
451 451 // signers
452 452 objArrayOop signers() const { return _signers; }
453 453 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
454 454
455 455 // source file name
456 456 Symbol* source_file_name() const { return _source_file_name; }
457 457 void set_source_file_name(Symbol* n);
458 458
459 459 // minor and major version numbers of class file
460 460 u2 minor_version() const { return _minor_version; }
461 461 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
462 462 u2 major_version() const { return _major_version; }
463 463 void set_major_version(u2 major_version) { _major_version = major_version; }
464 464
465 465 // source debug extension
466 466 Symbol* source_debug_extension() const { return _source_debug_extension; }
467 467 void set_source_debug_extension(Symbol* n);
468 468
469 469 // symbol unloading support (refcount already added)
470 470 Symbol* array_name() { return _array_name; }
471 471 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
472 472
473 473 // nonstatic oop-map blocks
474 474 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
475 475 return oop_map_count * OopMapBlock::size_in_words();
476 476 }
477 477 unsigned int nonstatic_oop_map_count() const {
478 478 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
479 479 }
480 480 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
481 481 void set_nonstatic_oop_map_size(int words) {
482 482 _nonstatic_oop_map_size = words;
483 483 }
484 484
485 485 // RedefineClasses() support for previous versions:
486 486 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
487 487 int emcp_method_count);
488 488 // If the _previous_versions array is non-NULL, then this klass
489 489 // has been redefined at least once even if we aren't currently
490 490 // tracking a previous version.
491 491 bool has_been_redefined() const { return _previous_versions != NULL; }
492 492 bool has_previous_version() const;
493 493 void init_previous_versions() {
494 494 _previous_versions = NULL;
495 495 }
496 496 GrowableArray<PreviousVersionNode *>* previous_versions() const {
497 497 return _previous_versions;
498 498 }
499 499
500 500 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
501 501 void set_cached_class_file(unsigned char *class_file_bytes,
502 502 jint class_file_len) { _cached_class_file_len = class_file_len;
503 503 _cached_class_file_bytes = class_file_bytes; }
504 504 jint get_cached_class_file_len() { return _cached_class_file_len; }
505 505 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
506 506
507 507 // JVMTI: Support for caching of field indices, types, and offsets
508 508 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
509 509 _jvmti_cached_class_field_map = descriptor;
510 510 }
511 511 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
512 512 return _jvmti_cached_class_field_map;
513 513 }
514 514
515 515 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
516 516 inline u2 next_method_idnum();
517 517 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
518 518
519 519 // generics support
520 520 Symbol* generic_signature() const { return _generic_signature; }
521 521 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
522 522
523 523 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
524 524 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
525 525 void set_enclosing_method_indices(u2 class_index,
526 526 u2 method_index) { _enclosing_method_class_index = class_index;
527 527 _enclosing_method_method_index = method_index; }
528 528
529 529 // JSR 292 support
530 530 oop bootstrap_method() const { return _bootstrap_method; } // AllowTransitionalJSR292 ONLY
531 531 void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); }
532 532
533 533 // jmethodID support
534 534 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
535 535 methodHandle method_h);
536 536 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
537 537 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
538 538 jmethodID* to_dealloc_id_p,
539 539 jmethodID** to_dealloc_jmeths_p);
540 540 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
541 541 size_t *length_p, jmethodID* id_p);
542 542 jmethodID jmethod_id_or_null(methodOop method);
543 543
544 544 // cached itable index support
545 545 void set_cached_itable_index(size_t idnum, int index);
546 546 int cached_itable_index(size_t idnum);
547 547
548 548 // annotations support
549 549 typeArrayOop class_annotations() const { return _class_annotations; }
550 550 objArrayOop fields_annotations() const { return _fields_annotations; }
551 551 objArrayOop methods_annotations() const { return _methods_annotations; }
552 552 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
553 553 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
554 554 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
555 555 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
556 556 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
557 557 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
558 558 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
559 559 typeArrayOop get_method_annotations_of(int idnum)
560 560 { return get_method_annotations_from(idnum, _methods_annotations); }
561 561 typeArrayOop get_method_parameter_annotations_of(int idnum)
562 562 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
563 563 typeArrayOop get_method_default_annotations_of(int idnum)
564 564 { return get_method_annotations_from(idnum, _methods_default_annotations); }
565 565 void set_method_annotations_of(int idnum, typeArrayOop anno)
566 566 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
567 567 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
568 568 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
569 569 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
570 570 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
571 571
572 572 // allocation
573 573 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
574 574 instanceOop allocate_instance(TRAPS);
575 575 instanceOop allocate_permanent_instance(TRAPS);
576 576
577 577 // additional member function to return a handle
578 578 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
579 579
580 580 objArrayOop allocate_objArray(int n, int length, TRAPS);
581 581 // Helper function
582 582 static instanceOop register_finalizer(instanceOop i, TRAPS);
583 583
584 584 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
585 585 // if not, throw either an Error or an Exception.
586 586 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
587 587
588 588 // initialization
589 589 void call_class_initializer(TRAPS);
590 590 void set_initialization_state_and_notify(ClassState state, TRAPS);
591 591
592 592 // OopMapCache support
593 593 OopMapCache* oop_map_cache() { return _oop_map_cache; }
594 594 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
595 595 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
596 596
597 597 // JNI identifier support (for static fields - for jni performance)
598 598 JNIid* jni_ids() { return _jni_ids; }
599 599 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
600 600 JNIid* jni_id_for(int offset);
601 601
602 602 // maintenance of deoptimization dependencies
603 603 int mark_dependent_nmethods(DepChange& changes);
604 604 void add_dependent_nmethod(nmethod* nm);
605 605 void remove_dependent_nmethod(nmethod* nm);
606 606
607 607 // On-stack replacement support
608 608 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
609 609 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
610 610 void add_osr_nmethod(nmethod* n);
611 611 void remove_osr_nmethod(nmethod* n);
612 612 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const;
613 613
614 614 // Breakpoint support (see methods on methodOop for details)
615 615 BreakpointInfo* breakpoints() const { return _breakpoints; };
616 616 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
617 617
618 618 // support for stub routines
619 619 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
620 620 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
621 621
622 622 // subclass/subinterface checks
623 623 bool implements_interface(klassOop k) const;
624 624
625 625 // Access to implementors of an interface. We only store the count
626 626 // of implementors, and in case, there are only a few
627 627 // implementors, we store them in a short list.
628 628 // This accessor returns NULL if we walk off the end of the list.
629 629 klassOop implementor(int i) const {
630 630 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
631 631 }
632 632 int nof_implementors() const { return _nof_implementors; }
633 633 void add_implementor(klassOop k); // k is a new class that implements this interface
634 634 void init_implementor(); // initialize
635 635
636 636 // link this class into the implementors list of every interface it implements
637 637 void process_interfaces(Thread *thread);
638 638
639 639 // virtual operations from Klass
640 640 bool is_leaf_class() const { return _subklass == NULL; }
641 641 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
642 642 bool compute_is_subtype_of(klassOop k);
643 643 bool can_be_primary_super_slow() const;
644 644 klassOop java_super() const { return super(); }
645 645 int oop_size(oop obj) const { return size_helper(); }
646 646 int klass_oop_size() const { return object_size(); }
647 647 bool oop_is_instance_slow() const { return true; }
648 648
649 649 // Iterators
650 650 void do_local_static_fields(FieldClosure* cl);
651 651 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
652 652 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
653 653
654 654 void methods_do(void f(methodOop method));
655 655 void array_klasses_do(void f(klassOop k));
656 656 void with_array_klasses_do(void f(klassOop k));
657 657 bool super_types_do(SuperTypeClosure* blk);
658 658
659 659 // Casting from klassOop
660 660 static instanceKlass* cast(klassOop k) {
661 661 assert(k->is_klass(), "must be");
662 662 Klass* kp = k->klass_part();
663 663 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
664 664 return (instanceKlass*) kp;
665 665 }
666 666
667 667 // Sizing (in words)
668 668 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
669 669 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); }
670 670 static int vtable_start_offset() { return header_size(); }
671 671 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
672 672 static int object_size(int extra) { return align_object_size(header_size() + extra); }
673 673
674 674 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
675 675 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
676 676 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
677 677
678 678 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
679 679
680 680 address static_field_addr(int offset);
681 681
682 682 OopMapBlock* start_of_nonstatic_oop_maps() const {
683 683 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
684 684 }
685 685
686 686 // Allocation profiling support
687 687 juint alloc_size() const { return _alloc_count * size_helper(); }
688 688 void set_alloc_size(juint n) {}
689 689
690 690 // Use this to return the size of an instance in heap words:
691 691 int size_helper() const {
692 692 return layout_helper_to_size_helper(layout_helper());
693 693 }
694 694
695 695 // This bit is initialized in classFileParser.cpp.
696 696 // It is false under any of the following conditions:
697 697 // - the class is abstract (including any interface)
698 698 // - the class has a finalizer (if !RegisterFinalizersAtInit)
699 699 // - the class size is larger than FastAllocateSizeLimit
700 700 // - the class is java/lang/Class, which cannot be allocated directly
701 701 bool can_be_fastpath_allocated() const {
702 702 return !layout_helper_needs_slow_path(layout_helper());
703 703 }
704 704
705 705 // Java vtable/itable
706 706 klassVtable* vtable() const; // return new klassVtable wrapper
707 707 inline methodOop method_at_vtable(int index);
708 708 klassItable* itable() const; // return new klassItable wrapper
709 709 methodOop method_at_itable(klassOop holder, int index, TRAPS);
710 710
711 711 // Garbage collection
712 712 void oop_follow_contents(oop obj);
713 713 int oop_adjust_pointers(oop obj);
714 714 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
715 715 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
716 716
717 717 void follow_weak_klass_links(
718 718 BoolObjectClosure* is_alive, OopClosure* keep_alive);
719 719 void release_C_heap_structures();
720 720
721 721 // Parallel Scavenge and Parallel Old
722 722 PARALLEL_GC_DECLS
723 723
724 724 // Naming
725 725 const char* signature_name() const;
726 726
727 727 // Iterators
728 728 int oop_oop_iterate(oop obj, OopClosure* blk) {
729 729 return oop_oop_iterate_v(obj, blk);
730 730 }
731 731
732 732 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
733 733 return oop_oop_iterate_v_m(obj, blk, mr);
734 734 }
735 735
736 736 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
737 737 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
738 738 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
739 739 MemRegion mr);
740 740
741 741 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
742 742 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
743 743
744 744 #ifndef SERIALGC
745 745 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
746 746 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
747 747
748 748 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
749 749 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
750 750 #endif // !SERIALGC
751 751
752 752 private:
753 753 // initialization state
754 754 #ifdef ASSERT
755 755 void set_init_state(ClassState state);
756 756 #else
757 757 void set_init_state(ClassState state) { _init_state = state; }
758 758 #endif
759 759 void set_rewritten() { _rewritten = true; }
760 760 void set_init_thread(Thread *thread) { _init_thread = thread; }
761 761
762 762 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
763 763 // The RedefineClasses() API can cause new method idnums to be needed
764 764 // which will cause the caches to grow. Safety requires different
765 765 // cache management logic if the caches can grow instead of just
766 766 // going from NULL to non-NULL.
767 767 bool idnum_can_increment() const { return has_been_redefined(); }
768 768 jmethodID* methods_jmethod_ids_acquire() const
769 769 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
770 770 void release_set_methods_jmethod_ids(jmethodID* jmeths)
771 771 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
772 772
773 773 int* methods_cached_itable_indices_acquire() const
774 774 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
775 775 void release_set_methods_cached_itable_indices(int* indices)
776 776 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
777 777
778 778 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
779 779 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
780 780 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
781 781
782 782 // Offsets for memory management
783 783 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
784 784 oop* adr_methods() const { return (oop*)&this->_methods;}
785 785 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
786 786 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
787 787 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
788 788 oop* adr_fields() const { return (oop*)&this->_fields;}
789 789 oop* adr_constants() const { return (oop*)&this->_constants;}
790 790 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
791 791 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
792 792 oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
793 793 oop* adr_signers() const { return (oop*)&this->_signers;}
794 794 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
795 795 oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
796 796 oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;} // AllowTransitionalJSR292 ONLY
797 797 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
798 798 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
799 799 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
800 800 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
801 801 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
802 802 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
803 803 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
804 804
805 805 // Static methods that are used to implement member methods where an exposed this pointer
806 806 // is needed due to possible GCs
807 807 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
808 808 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
809 809 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
810 810 static void eager_initialize_impl (instanceKlassHandle this_oop);
811 811 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
812 812 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
813 813 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
814 814 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
815 815 /* jni_id_for_impl for jfieldID only */
816 816 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
817 817
818 818 // Returns the array class for the n'th dimension
819 819 klassOop array_klass_impl(bool or_null, int n, TRAPS);
820 820
821 821 // Returns the array class with this class as element type
822 822 klassOop array_klass_impl(bool or_null, TRAPS);
823 823
824 824 public:
825 825 // sharing support
826 826 virtual void remove_unshareable_info();
827 827 virtual void shared_symbols_iterate(SymbolClosure* closure);
828 828
829 829 // jvm support
830 830 jint compute_modifier_flags(TRAPS) const;
831 831
832 832 public:
833 833 // JVMTI support
834 834 jint jvmti_class_status() const;
835 835
836 836 public:
837 837 // Printing
838 838 void oop_print_value_on(oop obj, outputStream* st);
839 839 #ifndef PRODUCT
840 840 void oop_print_on (oop obj, outputStream* st);
841 841
842 842 void print_dependent_nmethods(bool verbose = false);
843 843 bool is_dependent_nmethod(nmethod* nm);
844 844 #endif
845 845
846 846 // Verification
847 847 const char* internal_name() const;
848 848 void oop_verify_on(oop obj, outputStream* st);
849 849
850 850 #ifndef PRODUCT
851 851 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
852 852 #endif
853 853 };
854 854
855 855 inline methodOop instanceKlass::method_at_vtable(int index) {
856 856 #ifndef PRODUCT
857 857 assert(index >= 0, "valid vtable index");
858 858 if (DebugVtables) {
859 859 verify_vtable_index(index);
860 860 }
861 861 #endif
862 862 vtableEntry* ve = (vtableEntry*)start_of_vtable();
863 863 return ve[index].method();
864 864 }
865 865
866 866 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
867 867 if (annos == NULL || annos->length() <= idnum) {
868 868 return NULL;
869 869 }
870 870 return typeArrayOop(annos->obj_at(idnum));
871 871 }
872 872
873 873 // for adding methods
874 874 // UNSET_IDNUM return means no more ids available
875 875 inline u2 instanceKlass::next_method_idnum() {
876 876 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
877 877 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
878 878 } else {
879 879 return _idnum_allocated_count++;
880 880 }
881 881 }
882 882
883 883
884 884 /* JNIid class for jfieldIDs only */
885 885 class JNIid: public CHeapObj {
886 886 friend class VMStructs;
887 887 private:
888 888 klassOop _holder;
889 889 JNIid* _next;
890 890 int _offset;
891 891 #ifdef ASSERT
892 892 bool _is_static_field_id;
893 893 #endif
894 894
895 895 public:
896 896 // Accessors
897 897 klassOop holder() const { return _holder; }
898 898 int offset() const { return _offset; }
899 899 JNIid* next() { return _next; }
900 900 // Constructor
901 901 JNIid(klassOop holder, int offset, JNIid* next);
902 902 // Identifier lookup
903 903 JNIid* find(int offset);
904 904
905 905 bool find_local_field(fieldDescriptor* fd) {
906 906 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
907 907 }
908 908
909 909 // Garbage collection support
910 910 oop* holder_addr() { return (oop*)&_holder; }
911 911 void oops_do(OopClosure* f);
912 912 static void deallocate(JNIid* id);
913 913 // Debugging
914 914 #ifdef ASSERT
915 915 bool is_static_field_id() const { return _is_static_field_id; }
916 916 void set_is_static_field_id() { _is_static_field_id = true; }
917 917 #endif
918 918 void verify(klassOop holder);
919 919 };
920 920
921 921
922 922 // If breakpoints are more numerous than just JVMTI breakpoints,
923 923 // consider compressing this data structure.
924 924 // It is currently a simple linked list defined in methodOop.hpp.
925 925
926 926 class BreakpointInfo;
927 927
928 928
929 929 // A collection point for interesting information about the previous
930 930 // version(s) of an instanceKlass. This class uses weak references to
931 931 // the information so that the information may be collected as needed
932 932 // by the system. If the information is shared, then a regular
933 933 // reference must be used because a weak reference would be seen as
934 934 // collectible. A GrowableArray of PreviousVersionNodes is attached
935 935 // to the instanceKlass as needed. See PreviousVersionWalker below.
936 936 class PreviousVersionNode : public CHeapObj {
937 937 private:
938 938 // A shared ConstantPool is never collected so we'll always have
939 939 // a reference to it so we can update items in the cache. We'll
940 940 // have a weak reference to a non-shared ConstantPool until all
941 941 // of the methods (EMCP or obsolete) have been collected; the
942 942 // non-shared ConstantPool becomes collectible at that point.
943 943 jobject _prev_constant_pool; // regular or weak reference
944 944 bool _prev_cp_is_weak; // true if not a shared ConstantPool
945 945
946 946 // If the previous version of the instanceKlass doesn't have any
947 947 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
948 948 // EMCP methods have been collected, then _prev_EMCP_methods can
949 949 // have a length of zero.
950 950 GrowableArray<jweak>* _prev_EMCP_methods;
951 951
952 952 public:
953 953 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
954 954 GrowableArray<jweak>* prev_EMCP_methods);
955 955 ~PreviousVersionNode();
956 956 jobject prev_constant_pool() const {
957 957 return _prev_constant_pool;
958 958 }
959 959 GrowableArray<jweak>* prev_EMCP_methods() const {
960 960 return _prev_EMCP_methods;
961 961 }
962 962 };
963 963
964 964
965 965 // A Handle-ized version of PreviousVersionNode.
966 966 class PreviousVersionInfo : public ResourceObj {
967 967 private:
968 968 constantPoolHandle _prev_constant_pool_handle;
969 969 // If the previous version of the instanceKlass doesn't have any
970 970 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
971 971 // methods cannot be collected while we hold a handle,
972 972 // _prev_EMCP_methods should never have a length of zero.
973 973 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
974 974
975 975 public:
976 976 PreviousVersionInfo(PreviousVersionNode *pv_node);
977 977 ~PreviousVersionInfo();
978 978 constantPoolHandle prev_constant_pool_handle() const {
979 979 return _prev_constant_pool_handle;
980 980 }
981 981 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
982 982 return _prev_EMCP_method_handles;
983 983 }
984 984 };
985 985
986 986
987 987 // Helper object for walking previous versions. This helper cleans up
988 988 // the Handles that it allocates when the helper object is destroyed.
989 989 // The PreviousVersionInfo object returned by next_previous_version()
990 990 // is only valid until a subsequent call to next_previous_version() or
991 991 // the helper object is destroyed.
992 992 class PreviousVersionWalker : public StackObj {
993 993 private:
994 994 GrowableArray<PreviousVersionNode *>* _previous_versions;
995 995 int _current_index;
996 996 // Fields for cleaning up when we are done walking the previous versions:
997 997 // A HandleMark for the PreviousVersionInfo handles:
998 998 HandleMark _hm;
999 999
1000 1000 // It would be nice to have a ResourceMark field in this helper also,
1001 1001 // but the ResourceMark code says to be careful to delete handles held
1002 1002 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1003 1003 // can't guarantee the order in which the fields are destroyed, we
1004 1004 // have to let the creator of the PreviousVersionWalker object do
1005 1005 // the right thing. Also, adding a ResourceMark here causes an
1006 1006 // include loop.
1007 1007
1008 1008 // A pointer to the current info object so we can handle the deletes.
1009 1009 PreviousVersionInfo * _current_p;
1010 1010
1011 1011 public:
1012 1012 PreviousVersionWalker(instanceKlass *ik);
1013 1013 ~PreviousVersionWalker();
1014 1014
1015 1015 // Return the interesting information for the next previous version
1016 1016 // of the klass. Returns NULL if there are no more previous versions.
1017 1017 PreviousVersionInfo* next_previous_version();
1018 1018 };
1019 1019
1020 1020 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP
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