1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceOop.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/atomic.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/bitMap.inline.hpp"
40 #include "utilities/macros.hpp"
41 #include "trace/traceMacros.hpp"
42
43 // An InstanceKlass is the VM level representation of a Java class.
44 // It contains all information needed for at class at execution runtime.
45
46 // InstanceKlass layout:
47 // [C++ vtbl pointer ] Klass
48 // [subtype cache ] Klass
49 // [instance size ] Klass
50 // [java mirror ] Klass
51 // [super ] Klass
52 // [access_flags ] Klass
53 // [name ] Klass
54 // [first subklass ] Klass
55 // [next sibling ] Klass
56 // [array klasses ]
57 // [methods ]
58 // [local interfaces ]
59 // [transitive interfaces ]
60 // [fields ]
61 // [constants ]
62 // [class loader ]
63 // [source file name ]
64 // [inner classes ]
65 // [static field size ]
66 // [nonstatic field size ]
67 // [static oop fields size ]
68 // [nonstatic oop maps size ]
69 // [has finalize method ]
70 // [deoptimization mark bit ]
71 // [initialization state ]
72 // [initializing thread ]
73 // [Java vtable length ]
74 // [oop map cache (stack maps) ]
75 // [EMBEDDED Java vtable ] size in words = vtable_len
76 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
77 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
78 // indicating where oops are located in instances of this klass.
79 // [EMBEDDED implementor of the interface] only exist for interface
80 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
81
82
83 // forward declaration for class -- see below for definition
84 class SuperTypeClosure;
85 class JNIid;
86 class jniIdMapBase;
87 class BreakpointInfo;
88 class fieldDescriptor;
89 class DepChange;
90 class nmethodBucket;
91 class PreviousVersionNode;
92 class JvmtiCachedClassFieldMap;
93 class MemberNameTable;
94
95 // This is used in iterators below.
96 class FieldClosure: public StackObj {
97 public:
98 virtual void do_field(fieldDescriptor* fd) = 0;
99 };
100
101 #ifndef PRODUCT
102 // Print fields.
103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
104 class FieldPrinter: public FieldClosure {
105 oop _obj;
106 outputStream* _st;
107 public:
108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
109 void do_field(fieldDescriptor* fd);
110 };
111 #endif // !PRODUCT
112
113 // ValueObjs embedded in klass. Describes where oops are located in instances of
114 // this klass.
115 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
116 public:
117 // Byte offset of the first oop mapped by this block.
118 int offset() const { return _offset; }
119 void set_offset(int offset) { _offset = offset; }
120
121 // Number of oops in this block.
122 uint count() const { return _count; }
123 void set_count(uint count) { _count = count; }
124
125 // sizeof(OopMapBlock) in HeapWords.
126 static const int size_in_words() {
127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
128 LogHeapWordSize;
129 }
130
131 private:
132 int _offset;
133 uint _count;
134 };
135
136 struct JvmtiCachedClassFileData;
137
138 class InstanceKlass: public Klass {
139 friend class VMStructs;
140 friend class ClassFileParser;
141 friend class CompileReplay;
142
143 protected:
144 // Constructor
145 InstanceKlass(int vtable_len,
146 int itable_len,
147 int static_field_size,
148 int nonstatic_oop_map_size,
149 ReferenceType rt,
150 AccessFlags access_flags,
151 bool is_anonymous);
152 public:
153 static InstanceKlass* allocate_instance_klass(
154 ClassLoaderData* loader_data,
155 int vtable_len,
156 int itable_len,
157 int static_field_size,
158 int nonstatic_oop_map_size,
159 ReferenceType rt,
160 AccessFlags access_flags,
161 Symbol* name,
162 Klass* super_klass,
163 bool is_anonymous,
164 TRAPS);
165
166 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
167
168 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
169 // of the class loading & initialization procedure, and the use of the states.
170 enum ClassState {
171 allocated, // allocated (but not yet linked)
172 loaded, // loaded and inserted in class hierarchy (but not linked yet)
173 linked, // successfully linked/verified (but not initialized yet)
174 being_initialized, // currently running class initializer
175 fully_initialized, // initialized (successfull final state)
176 initialization_error // error happened during initialization
177 };
178
179 static int number_of_instance_classes() { return _total_instanceKlass_count; }
180
181 private:
182 static volatile int _total_instanceKlass_count;
183
184 protected:
185 // Annotations for this class
186 Annotations* _annotations;
187 // Array classes holding elements of this class.
188 Klass* _array_klasses;
189 // Constant pool for this class.
190 ConstantPool* _constants;
191 // The InnerClasses attribute and EnclosingMethod attribute. The
192 // _inner_classes is an array of shorts. If the class has InnerClasses
193 // attribute, then the _inner_classes array begins with 4-tuples of shorts
194 // [inner_class_info_index, outer_class_info_index,
195 // inner_name_index, inner_class_access_flags] for the InnerClasses
196 // attribute. If the EnclosingMethod attribute exists, it occupies the
197 // last two shorts [class_index, method_index] of the array. If only
198 // the InnerClasses attribute exists, the _inner_classes array length is
199 // number_of_inner_classes * 4. If the class has both InnerClasses
200 // and EnclosingMethod attributes the _inner_classes array length is
201 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
202 Array<jushort>* _inner_classes;
203
204 // the source debug extension for this klass, NULL if not specified.
205 // Specified as UTF-8 string without terminating zero byte in the classfile,
206 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
207 char* _source_debug_extension;
208 // Array name derived from this class which needs unreferencing
209 // if this class is unloaded.
210 Symbol* _array_name;
211
212 // Number of heapOopSize words used by non-static fields in this klass
213 // (including inherited fields but after header_size()).
214 int _nonstatic_field_size;
215 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
216 // Constant pool index to the utf8 entry of the Generic signature,
217 // or 0 if none.
218 u2 _generic_signature_index;
219 // Constant pool index to the utf8 entry for the name of source file
220 // containing this klass, 0 if not specified.
221 u2 _source_file_name_index;
222 u2 _static_oop_field_count;// number of static oop fields in this klass
223 u2 _java_fields_count; // The number of declared Java fields
224 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
225
226 // _is_marked_dependent can be set concurrently, thus cannot be part of the
227 // _misc_flags.
228 bool _is_marked_dependent; // used for marking during flushing and deoptimization
229 bool _has_unloaded_dependent;
230
231 enum {
232 _misc_rewritten = 1 << 0, // methods rewritten.
233 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
234 _misc_should_verify_class = 1 << 2, // allow caching of preverification
235 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
236 _misc_is_contended = 1 << 4, // marked with contended annotation
237 _misc_has_default_methods = 1 << 5 // class/superclass/implemented interfaces has default methods
238 };
239 u2 _misc_flags;
240 u2 _minor_version; // minor version number of class file
241 u2 _major_version; // major version number of class file
242 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
243 int _vtable_len; // length of Java vtable (in words)
244 int _itable_len; // length of Java itable (in words)
245 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
246 MemberNameTable* _member_names; // Member names
247 JNIid* _jni_ids; // First JNI identifier for static fields in this class
248 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
249 nmethodBucket* _dependencies; // list of dependent nmethods
250 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
251 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
252 // Array of interesting part(s) of the previous version(s) of this
253 // InstanceKlass. See PreviousVersionWalker below.
254 GrowableArray<PreviousVersionNode *>* _previous_versions;
255 // JVMTI fields can be moved to their own structure - see 6315920
256 // JVMTI: cached class file, before retransformable agent modified it in CFLH
257 JvmtiCachedClassFileData* _cached_class_file;
258
259 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
260
261 // Class states are defined as ClassState (see above).
262 // Place the _init_state here to utilize the unused 2-byte after
263 // _idnum_allocated_count.
264 u1 _init_state; // state of class
265 u1 _reference_type; // reference type
266
267 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
268
269 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
270
271 // Method array.
272 Array<Method*>* _methods;
273 // Default Method Array, concrete methods inherited from interfaces
274 Array<Method*>* _default_methods;
275 // Interface (Klass*s) this class declares locally to implement.
276 Array<Klass*>* _local_interfaces;
277 // Interface (Klass*s) this class implements transitively.
278 Array<Klass*>* _transitive_interfaces;
279 // Int array containing the original order of method in the class file (for JVMTI).
280 Array<int>* _method_ordering;
281 // Int array containing the vtable_indices for default_methods
282 // offset matches _default_methods offset
283 Array<int>* _default_vtable_indices;
284
285 // Instance and static variable information, starts with 6-tuples of shorts
286 // [access, name index, sig index, initval index, low_offset, high_offset]
287 // for all fields, followed by the generic signature data at the end of
288 // the array. Only fields with generic signature attributes have the generic
289 // signature data set in the array. The fields array looks like following:
290 //
291 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
292 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
293 // ...
294 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
295 // [generic signature index]
296 // [generic signature index]
297 // ...
298 Array<u2>* _fields;
299
300 // embedded Java vtable follows here
301 // embedded Java itables follows here
302 // embedded static fields follows here
303 // embedded nonstatic oop-map blocks follows here
304 // embedded implementor of this interface follows here
305 // The embedded implementor only exists if the current klass is an
306 // iterface. The possible values of the implementor fall into following
307 // three cases:
308 // NULL: no implementor.
309 // A Klass* that's not itself: one implementor.
310 // Itself: more than one implementors.
311 // embedded host klass follows here
312 // The embedded host klass only exists in an anonymous class for
313 // dynamic language support (JSR 292 enabled). The host class grants
314 // its access privileges to this class also. The host class is either
315 // named, or a previously loaded anonymous class. A non-anonymous class
316 // or an anonymous class loaded through normal classloading does not
317 // have this embedded field.
318 //
319
320 friend class SystemDictionary;
321
322 public:
323 bool has_nonstatic_fields() const {
324 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
325 }
326 void set_has_nonstatic_fields(bool b) {
327 if (b) {
328 _misc_flags |= _misc_has_nonstatic_fields;
329 } else {
330 _misc_flags &= ~_misc_has_nonstatic_fields;
331 }
332 }
333
334 // field sizes
335 int nonstatic_field_size() const { return _nonstatic_field_size; }
336 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
337
338 int static_field_size() const { return _static_field_size; }
339 void set_static_field_size(int size) { _static_field_size = size; }
340
341 int static_oop_field_count() const { return (int)_static_oop_field_count; }
342 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
343
344 // Java vtable
345 int vtable_length() const { return _vtable_len; }
346 void set_vtable_length(int len) { _vtable_len = len; }
347
348 // Java itable
349 int itable_length() const { return _itable_len; }
350 void set_itable_length(int len) { _itable_len = len; }
351
352 // array klasses
353 Klass* array_klasses() const { return _array_klasses; }
354 void set_array_klasses(Klass* k) { _array_klasses = k; }
355
356 // methods
357 Array<Method*>* methods() const { return _methods; }
358 void set_methods(Array<Method*>* a) { _methods = a; }
359 Method* method_with_idnum(int idnum);
360
361 // method ordering
362 Array<int>* method_ordering() const { return _method_ordering; }
363 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
364 void copy_method_ordering(intArray* m, TRAPS);
365
366 // default_methods
367 Array<Method*>* default_methods() const { return _default_methods; }
368 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
369
370 // default method vtable_indices
371 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
372 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
373 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
374
375 // interfaces
376 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
377 void set_local_interfaces(Array<Klass*>* a) {
378 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
379 _local_interfaces = a; }
380
381 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
382 void set_transitive_interfaces(Array<Klass*>* a) {
383 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
384 _transitive_interfaces = a;
385 }
386
387 private:
388 friend class fieldDescriptor;
389 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
390
391 public:
392 int field_offset (int index) const { return field(index)->offset(); }
393 int field_access_flags(int index) const { return field(index)->access_flags(); }
394 Symbol* field_name (int index) const { return field(index)->name(constants()); }
395 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
396
397 // Number of Java declared fields
398 int java_fields_count() const { return (int)_java_fields_count; }
399
400 Array<u2>* fields() const { return _fields; }
401 void set_fields(Array<u2>* f, u2 java_fields_count) {
402 guarantee(_fields == NULL || f == NULL, "Just checking");
403 _fields = f;
404 _java_fields_count = java_fields_count;
405 }
406
407 // inner classes
408 Array<u2>* inner_classes() const { return _inner_classes; }
409 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
410
411 enum InnerClassAttributeOffset {
412 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
413 inner_class_inner_class_info_offset = 0,
414 inner_class_outer_class_info_offset = 1,
415 inner_class_inner_name_offset = 2,
416 inner_class_access_flags_offset = 3,
417 inner_class_next_offset = 4
418 };
419
420 enum EnclosingMethodAttributeOffset {
421 enclosing_method_class_index_offset = 0,
422 enclosing_method_method_index_offset = 1,
423 enclosing_method_attribute_size = 2
424 };
425
426 // method override check
427 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
428
429 // package
430 bool is_same_class_package(Klass* class2);
431 bool is_same_class_package(oop classloader2, Symbol* classname2);
432 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
433
434 // find an enclosing class (defined where original code was, in jvm.cpp!)
435 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
436 instanceKlassHandle self(THREAD, this);
437 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
438 }
439 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
440 bool* inner_is_member, TRAPS);
441
442 // tell if two classes have the same enclosing class (at package level)
443 bool is_same_package_member(Klass* class2, TRAPS) {
444 instanceKlassHandle self(THREAD, this);
445 return is_same_package_member_impl(self, class2, THREAD);
446 }
447 static bool is_same_package_member_impl(instanceKlassHandle self,
448 Klass* class2, TRAPS);
449
450 // initialization state
451 bool is_loaded() const { return _init_state >= loaded; }
452 bool is_linked() const { return _init_state >= linked; }
453 bool is_initialized() const { return _init_state == fully_initialized; }
454 bool is_not_initialized() const { return _init_state < being_initialized; }
455 bool is_being_initialized() const { return _init_state == being_initialized; }
456 bool is_in_error_state() const { return _init_state == initialization_error; }
457 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
458 ClassState init_state() { return (ClassState)_init_state; }
459 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
460
461 // defineClass specified verification
462 bool should_verify_class() const {
463 return (_misc_flags & _misc_should_verify_class) != 0;
464 }
465 void set_should_verify_class(bool value) {
466 if (value) {
467 _misc_flags |= _misc_should_verify_class;
468 } else {
469 _misc_flags &= ~_misc_should_verify_class;
470 }
471 }
472
473 // marking
474 bool is_marked_dependent() const { return _is_marked_dependent; }
475 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
476
477 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
478 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
479
480 // initialization (virtuals from Klass)
481 bool should_be_initialized() const; // means that initialize should be called
482 void initialize(TRAPS);
483 void link_class(TRAPS);
484 bool link_class_or_fail(TRAPS); // returns false on failure
485 void unlink_class();
486 void rewrite_class(TRAPS);
487 void link_methods(TRAPS);
488 Method* class_initializer();
489
490 // set the class to initialized if no static initializer is present
491 void eager_initialize(Thread *thread);
492
493 // reference type
494 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
495 void set_reference_type(ReferenceType t) {
496 assert(t == (u1)t, "overflow");
497 _reference_type = (u1)t;
498 }
499
500 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
501
502 // find local field, returns true if found
503 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
504 // find field in direct superinterfaces, returns the interface in which the field is defined
505 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
506 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
507 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
508 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
509 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
510
511 // find a non-static or static field given its offset within the class.
512 bool contains_field_offset(int offset) {
513 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
514 }
515
516 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
517 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
518
519 // find a local method (returns NULL if not found)
520 Method* find_method(Symbol* name, Symbol* signature) const;
521 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
522 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
523
524 // find a local method index in default_methods (returns -1 if not found)
525 static int find_method_index(Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass);
526
527 // lookup operation (returns NULL if not found)
528 Method* uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const;
529
530 // lookup a method in all the interfaces that this class implements
531 // (returns NULL if not found)
532 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, MethodLookupMode mode) const;
533
534 // lookup a method in local defaults then in all interfaces
535 // (returns NULL if not found)
536 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
537
538 // Find method indices by name. If a method with the specified name is
539 // found the index to the first method is returned, and 'end' is filled in
540 // with the index of first non-name-matching method. If no method is found
541 // -1 is returned.
542 int find_method_by_name(Symbol* name, int* end);
543 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
544
545 // constant pool
546 ConstantPool* constants() const { return _constants; }
547 void set_constants(ConstantPool* c) { _constants = c; }
548
549 // protection domain
550 oop protection_domain() const;
551
552 // signers
553 objArrayOop signers() const;
554
555 // host class
556 Klass* host_klass() const {
557 Klass** hk = (Klass**)adr_host_klass();
558 if (hk == NULL) {
559 return NULL;
560 } else {
561 assert(*hk != NULL, "host klass should always be set if the address is not null");
562 return *hk;
563 }
564 }
565 void set_host_klass(Klass* host) {
566 assert(is_anonymous(), "not anonymous");
567 Klass** addr = (Klass**)adr_host_klass();
568 assert(addr != NULL, "no reversed space");
569 if (addr != NULL) {
570 *addr = host;
571 }
572 }
573 bool is_anonymous() const {
574 return (_misc_flags & _misc_is_anonymous) != 0;
575 }
576 void set_is_anonymous(bool value) {
577 if (value) {
578 _misc_flags |= _misc_is_anonymous;
579 } else {
580 _misc_flags &= ~_misc_is_anonymous;
581 }
582 }
583
584 // Oop that keeps the metadata for this class from being unloaded
585 // in places where the metadata is stored in other places, like nmethods
586 oop klass_holder() const {
587 return is_anonymous() ? java_mirror() : class_loader();
588 }
589
590 bool is_contended() const {
591 return (_misc_flags & _misc_is_contended) != 0;
592 }
593 void set_is_contended(bool value) {
594 if (value) {
595 _misc_flags |= _misc_is_contended;
596 } else {
597 _misc_flags &= ~_misc_is_contended;
598 }
599 }
600
601 // source file name
602 Symbol* source_file_name() const {
603 return (_source_file_name_index == 0) ?
604 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
605 }
606 u2 source_file_name_index() const {
607 return _source_file_name_index;
608 }
609 void set_source_file_name_index(u2 sourcefile_index) {
610 _source_file_name_index = sourcefile_index;
611 }
612
613 // minor and major version numbers of class file
614 u2 minor_version() const { return _minor_version; }
615 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
616 u2 major_version() const { return _major_version; }
617 void set_major_version(u2 major_version) { _major_version = major_version; }
618
619 // source debug extension
620 char* source_debug_extension() const { return _source_debug_extension; }
621 void set_source_debug_extension(char* array, int length);
622
623 // symbol unloading support (refcount already added)
624 Symbol* array_name() { return _array_name; }
625 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
626
627 // nonstatic oop-map blocks
628 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
629 return oop_map_count * OopMapBlock::size_in_words();
630 }
631 unsigned int nonstatic_oop_map_count() const {
632 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
633 }
634 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
635 void set_nonstatic_oop_map_size(int words) {
636 _nonstatic_oop_map_size = words;
637 }
638
639 // RedefineClasses() support for previous versions:
640 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
641 int emcp_method_count);
642 // If the _previous_versions array is non-NULL, then this klass
643 // has been redefined at least once even if we aren't currently
644 // tracking a previous version.
645 bool has_been_redefined() const { return _previous_versions != NULL; }
646 bool has_previous_version() const;
647 void init_previous_versions() {
648 _previous_versions = NULL;
649 }
650 GrowableArray<PreviousVersionNode *>* previous_versions() const {
651 return _previous_versions;
652 }
653
654 static void purge_previous_versions(InstanceKlass* ik);
655
656 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
657 void set_cached_class_file(JvmtiCachedClassFileData *data) {
658 _cached_class_file = data;
659 }
660 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
661 jint get_cached_class_file_len();
662 unsigned char * get_cached_class_file_bytes();
663
664 // JVMTI: Support for caching of field indices, types, and offsets
665 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
666 _jvmti_cached_class_field_map = descriptor;
667 }
668 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
669 return _jvmti_cached_class_field_map;
670 }
671
672 bool has_default_methods() const {
673 return (_misc_flags & _misc_has_default_methods) != 0;
674 }
675 void set_has_default_methods(bool b) {
676 if (b) {
677 _misc_flags |= _misc_has_default_methods;
678 } else {
679 _misc_flags &= ~_misc_has_default_methods;
680 }
681 }
682
683 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
684 inline u2 next_method_idnum();
685 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
686
687 // generics support
688 Symbol* generic_signature() const {
689 return (_generic_signature_index == 0) ?
690 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
691 }
692 u2 generic_signature_index() const {
693 return _generic_signature_index;
694 }
695 void set_generic_signature_index(u2 sig_index) {
696 _generic_signature_index = sig_index;
697 }
698
699 u2 enclosing_method_data(int offset);
700 u2 enclosing_method_class_index() {
701 return enclosing_method_data(enclosing_method_class_index_offset);
702 }
703 u2 enclosing_method_method_index() {
704 return enclosing_method_data(enclosing_method_method_index_offset);
705 }
706 void set_enclosing_method_indices(u2 class_index,
707 u2 method_index);
708
709 // jmethodID support
710 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
711 methodHandle method_h);
712 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
713 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
714 jmethodID* to_dealloc_id_p,
715 jmethodID** to_dealloc_jmeths_p);
716 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
717 size_t *length_p, jmethodID* id_p);
718 jmethodID jmethod_id_or_null(Method* method);
719
720 // annotations support
721 Annotations* annotations() const { return _annotations; }
722 void set_annotations(Annotations* anno) { _annotations = anno; }
723
724 AnnotationArray* class_annotations() const {
725 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
726 }
727 Array<AnnotationArray*>* fields_annotations() const {
728 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
729 }
730 AnnotationArray* class_type_annotations() const {
731 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
732 }
733 Array<AnnotationArray*>* fields_type_annotations() const {
734 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
735 }
736 // allocation
737 instanceOop allocate_instance(TRAPS);
738
739 // additional member function to return a handle
740 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
741
742 objArrayOop allocate_objArray(int n, int length, TRAPS);
743 // Helper function
744 static instanceOop register_finalizer(instanceOop i, TRAPS);
745
746 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
747 // if not, throw either an Error or an Exception.
748 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
749
750 // initialization
751 void call_class_initializer(TRAPS);
752 void set_initialization_state_and_notify(ClassState state, TRAPS);
753
754 // OopMapCache support
755 OopMapCache* oop_map_cache() { return _oop_map_cache; }
756 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
757 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
758
759 // JNI identifier support (for static fields - for jni performance)
760 JNIid* jni_ids() { return _jni_ids; }
761 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
762 JNIid* jni_id_for(int offset);
763
764 // maintenance of deoptimization dependencies
765 int mark_dependent_nmethods(DepChange& changes);
766 void add_dependent_nmethod(nmethod* nm);
767 void remove_dependent_nmethod(nmethod* nm);
768
769 // On-stack replacement support
770 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
771 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
772 void add_osr_nmethod(nmethod* n);
773 void remove_osr_nmethod(nmethod* n);
774 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
775
776 // Breakpoint support (see methods on Method* for details)
777 BreakpointInfo* breakpoints() const { return _breakpoints; };
778 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
779
780 // support for stub routines
781 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
782 TRACE_DEFINE_OFFSET;
783 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
784
785 // subclass/subinterface checks
786 bool implements_interface(Klass* k) const;
787 bool is_same_or_direct_interface(Klass* k) const;
788
789 // Access to the implementor of an interface.
790 Klass* implementor() const
791 {
792 Klass** k = adr_implementor();
793 if (k == NULL) {
794 return NULL;
795 } else {
796 return *k;
797 }
798 }
799
800 void set_implementor(Klass* k) {
801 assert(is_interface(), "not interface");
802 Klass** addr = adr_implementor();
803 assert(addr != NULL, "null addr");
804 if (addr != NULL) {
805 *addr = k;
806 }
807 }
808
809 int nof_implementors() const {
810 Klass* k = implementor();
811 if (k == NULL) {
812 return 0;
813 } else if (k != this) {
814 return 1;
815 } else {
816 return 2;
817 }
818 }
819
820 void add_implementor(Klass* k); // k is a new class that implements this interface
821 void init_implementor(); // initialize
822
823 // link this class into the implementors list of every interface it implements
824 void process_interfaces(Thread *thread);
825
826 // virtual operations from Klass
827 bool is_leaf_class() const { return _subklass == NULL; }
828 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
829 bool compute_is_subtype_of(Klass* k);
830 bool can_be_primary_super_slow() const;
831 int oop_size(oop obj) const { return size_helper(); }
832 bool oop_is_instance_slow() const { return true; }
833
834 // Iterators
835 void do_local_static_fields(FieldClosure* cl);
836 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
837 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
838
839 void methods_do(void f(Method* method));
840 void array_klasses_do(void f(Klass* k));
841 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
842 bool super_types_do(SuperTypeClosure* blk);
843
844 // Casting from Klass*
845 static InstanceKlass* cast(Klass* k) {
846 assert(k->is_klass(), "must be");
847 assert(k->oop_is_instance(), "cast to InstanceKlass");
848 return (InstanceKlass*) k;
849 }
850
851 InstanceKlass* java_super() const {
852 return (super() == NULL) ? NULL : cast(super());
853 }
854
855 // Sizing (in words)
856 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
857
858 static int size(int vtable_length, int itable_length,
859 int nonstatic_oop_map_size,
860 bool is_interface, bool is_anonymous) {
861 return align_object_size(header_size() +
862 align_object_offset(vtable_length) +
863 align_object_offset(itable_length) +
864 ((is_interface || is_anonymous) ?
865 align_object_offset(nonstatic_oop_map_size) :
866 nonstatic_oop_map_size) +
867 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
868 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
869 }
870 int size() const { return size(vtable_length(),
871 itable_length(),
872 nonstatic_oop_map_size(),
873 is_interface(),
874 is_anonymous());
875 }
876 #if INCLUDE_SERVICES
877 virtual void collect_statistics(KlassSizeStats *sz) const;
878 #endif
879
880 static int vtable_start_offset() { return header_size(); }
881 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
882
883 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
884 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
885 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
886
887 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
888
889 address static_field_addr(int offset);
890
891 OopMapBlock* start_of_nonstatic_oop_maps() const {
892 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
893 }
894
895 Klass** end_of_nonstatic_oop_maps() const {
896 return (Klass**)(start_of_nonstatic_oop_maps() +
897 nonstatic_oop_map_count());
898 }
899
900 Klass** adr_implementor() const {
901 if (is_interface()) {
902 return (Klass**)end_of_nonstatic_oop_maps();
903 } else {
904 return NULL;
905 }
906 };
907
908 Klass** adr_host_klass() const {
909 if (is_anonymous()) {
910 Klass** adr_impl = adr_implementor();
911 if (adr_impl != NULL) {
912 return adr_impl + 1;
913 } else {
914 return end_of_nonstatic_oop_maps();
915 }
916 } else {
917 return NULL;
918 }
919 }
920
921 // Use this to return the size of an instance in heap words:
922 int size_helper() const {
923 return layout_helper_to_size_helper(layout_helper());
924 }
925
926 // This bit is initialized in classFileParser.cpp.
927 // It is false under any of the following conditions:
928 // - the class is abstract (including any interface)
929 // - the class has a finalizer (if !RegisterFinalizersAtInit)
930 // - the class size is larger than FastAllocateSizeLimit
931 // - the class is java/lang/Class, which cannot be allocated directly
932 bool can_be_fastpath_allocated() const {
933 return !layout_helper_needs_slow_path(layout_helper());
934 }
935
936 // Java vtable/itable
937 klassVtable* vtable() const; // return new klassVtable wrapper
938 inline Method* method_at_vtable(int index);
939 klassItable* itable() const; // return new klassItable wrapper
940 Method* method_at_itable(Klass* holder, int index, TRAPS);
941
942 #if INCLUDE_JVMTI
943 void adjust_default_methods(Method** old_methods, Method** new_methods,
944 int methods_length, bool* trace_name_printed);
945 #endif // INCLUDE_JVMTI
946
947 // Garbage collection
948 void oop_follow_contents(oop obj);
949 int oop_adjust_pointers(oop obj);
950
951 void clean_implementors_list(BoolObjectClosure* is_alive);
952 void clean_method_data(BoolObjectClosure* is_alive);
953 void clean_dependent_nmethods();
954
955 // Explicit metaspace deallocation of fields
956 // For RedefineClasses and class file parsing errors, we need to deallocate
957 // instanceKlasses and the metadata they point to.
958 void deallocate_contents(ClassLoaderData* loader_data);
959 static void deallocate_methods(ClassLoaderData* loader_data,
960 Array<Method*>* methods);
961 void static deallocate_interfaces(ClassLoaderData* loader_data,
962 Klass* super_klass,
963 Array<Klass*>* local_interfaces,
964 Array<Klass*>* transitive_interfaces);
965
966 // The constant pool is on stack if any of the methods are executing or
967 // referenced by handles.
968 bool on_stack() const { return _constants->on_stack(); }
969
970 // callbacks for actions during class unloading
971 static void notify_unload_class(InstanceKlass* ik);
972 static void release_C_heap_structures(InstanceKlass* ik);
973
974 // Parallel Scavenge and Parallel Old
975 PARALLEL_GC_DECLS
976
977 // Naming
978 const char* signature_name() const;
979
980 // Iterators
981 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
982 return oop_oop_iterate_v(obj, blk);
983 }
984
985 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
986 return oop_oop_iterate_v_m(obj, blk, mr);
987 }
988
989 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
990 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
991 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
992 MemRegion mr);
993
994 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
995 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
996
997 #if INCLUDE_ALL_GCS
998 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
999 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
1000
1001 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1002 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1003 #endif // INCLUDE_ALL_GCS
1004
1005 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1006
1007 public:
1008 void set_in_error_state() {
1009 assert(DumpSharedSpaces, "only call this when dumping archive");
1010 _init_state = initialization_error;
1011 }
1012 bool check_sharing_error_state();
1013
1014 private:
1015 // initialization state
1016 #ifdef ASSERT
1017 void set_init_state(ClassState state);
1018 #else
1019 void set_init_state(ClassState state) { _init_state = (u1)state; }
1020 #endif
1021 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1022 void set_init_thread(Thread *thread) { _init_thread = thread; }
1023
1024 // The RedefineClasses() API can cause new method idnums to be needed
1025 // which will cause the caches to grow. Safety requires different
1026 // cache management logic if the caches can grow instead of just
1027 // going from NULL to non-NULL.
1028 bool idnum_can_increment() const { return has_been_redefined(); }
1029 jmethodID* methods_jmethod_ids_acquire() const
1030 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1031 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1032 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1033
1034 // Lock during initialization
1035 public:
1036 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1037 // Must be one per class and it has to be a VM internal object so java code
1038 // cannot lock it (like the mirror).
1039 // It has to be an object not a Mutex because it's held through java calls.
1040 oop init_lock() const;
1041 private:
1042 void fence_and_clear_init_lock();
1043
1044 // Static methods that are used to implement member methods where an exposed this pointer
1045 // is needed due to possible GCs
1046 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1047 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1048 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1049 static void eager_initialize_impl (instanceKlassHandle this_oop);
1050 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1051 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1052 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1053 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1054 /* jni_id_for_impl for jfieldID only */
1055 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1056
1057 // Returns the array class for the n'th dimension
1058 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1059
1060 // Returns the array class with this class as element type
1061 Klass* array_klass_impl(bool or_null, TRAPS);
1062
1063 // find a local method (returns NULL if not found)
1064 Method* find_method_impl(Symbol* name, Symbol* signature, bool skipping_overpass) const;
1065 static Method* find_method_impl(Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass);
1066
1067 // Free CHeap allocated fields.
1068 void release_C_heap_structures();
1069 public:
1070 // CDS support - remove and restore oops from metadata. Oops are not shared.
1071 virtual void remove_unshareable_info();
1072 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1073
1074 // jvm support
1075 jint compute_modifier_flags(TRAPS) const;
1076
1077 // JSR-292 support
1078 MemberNameTable* member_names() { return _member_names; }
1079 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1080 void add_member_name(int index, Handle member_name);
1081 oop get_member_name(int index);
1082
1083 public:
1084 // JVMTI support
1085 jint jvmti_class_status() const;
1086
1087 public:
1088 // Printing
1089 #ifndef PRODUCT
1090 void print_on(outputStream* st) const;
1091 #endif
1092 void print_value_on(outputStream* st) const;
1093
1094 void oop_print_value_on(oop obj, outputStream* st);
1095
1096 #ifndef PRODUCT
1097 void oop_print_on (oop obj, outputStream* st);
1098
1099 void print_dependent_nmethods(bool verbose = false);
1100 bool is_dependent_nmethod(nmethod* nm);
1101 #endif
1102
1103 const char* internal_name() const;
1104
1105 // Verification
1106 void verify_on(outputStream* st);
1107
1108 void oop_verify_on(oop obj, outputStream* st);
1109 };
1110
1111 inline Method* InstanceKlass::method_at_vtable(int index) {
1112 #ifndef PRODUCT
1113 assert(index >= 0, "valid vtable index");
1114 if (DebugVtables) {
1115 verify_vtable_index(index);
1116 }
1117 #endif
1118 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1119 return ve[index].method();
1120 }
1121
1122 // for adding methods
1123 // UNSET_IDNUM return means no more ids available
1124 inline u2 InstanceKlass::next_method_idnum() {
1125 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1126 return ConstMethod::UNSET_IDNUM; // no more ids available
1127 } else {
1128 return _idnum_allocated_count++;
1129 }
1130 }
1131
1132
1133 /* JNIid class for jfieldIDs only */
1134 class JNIid: public CHeapObj<mtClass> {
1135 friend class VMStructs;
1136 private:
1137 Klass* _holder;
1138 JNIid* _next;
1139 int _offset;
1140 #ifdef ASSERT
1141 bool _is_static_field_id;
1142 #endif
1143
1144 public:
1145 // Accessors
1146 Klass* holder() const { return _holder; }
1147 int offset() const { return _offset; }
1148 JNIid* next() { return _next; }
1149 // Constructor
1150 JNIid(Klass* holder, int offset, JNIid* next);
1151 // Identifier lookup
1152 JNIid* find(int offset);
1153
1154 bool find_local_field(fieldDescriptor* fd) {
1155 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1156 }
1157
1158 static void deallocate(JNIid* id);
1159 // Debugging
1160 #ifdef ASSERT
1161 bool is_static_field_id() const { return _is_static_field_id; }
1162 void set_is_static_field_id() { _is_static_field_id = true; }
1163 #endif
1164 void verify(Klass* holder);
1165 };
1166
1167
1168 // If breakpoints are more numerous than just JVMTI breakpoints,
1169 // consider compressing this data structure.
1170 // It is currently a simple linked list defined in method.hpp.
1171
1172 class BreakpointInfo;
1173
1174
1175 // A collection point for interesting information about the previous
1176 // version(s) of an InstanceKlass. A GrowableArray of PreviousVersionNodes
1177 // is attached to the InstanceKlass as needed. See PreviousVersionWalker below.
1178 class PreviousVersionNode : public CHeapObj<mtClass> {
1179 private:
1180 ConstantPool* _prev_constant_pool;
1181
1182 // If the previous version of the InstanceKlass doesn't have any
1183 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1184 // EMCP methods have been collected, then _prev_EMCP_methods can
1185 // have a length of zero.
1186 GrowableArray<Method*>* _prev_EMCP_methods;
1187
1188 public:
1189 PreviousVersionNode(ConstantPool* prev_constant_pool,
1190 GrowableArray<Method*>* prev_EMCP_methods);
1191 ~PreviousVersionNode();
1192 ConstantPool* prev_constant_pool() const {
1193 return _prev_constant_pool;
1194 }
1195 GrowableArray<Method*>* prev_EMCP_methods() const {
1196 return _prev_EMCP_methods;
1197 }
1198 };
1199
1200
1201 // Helper object for walking previous versions.
1202 class PreviousVersionWalker : public StackObj {
1203 private:
1204 Thread* _thread;
1205 GrowableArray<PreviousVersionNode *>* _previous_versions;
1206 int _current_index;
1207
1208 // A pointer to the current node object so we can handle the deletes.
1209 PreviousVersionNode* _current_p;
1210
1211 // The constant pool handle keeps all the methods in this class from being
1212 // deallocated from the metaspace during class unloading.
1213 constantPoolHandle _current_constant_pool_handle;
1214
1215 public:
1216 PreviousVersionWalker(Thread* thread, InstanceKlass *ik);
1217
1218 // Return the interesting information for the next previous version
1219 // of the klass. Returns NULL if there are no more previous versions.
1220 PreviousVersionNode* next_previous_version();
1221 };
1222
1223
1224 //
1225 // nmethodBucket is used to record dependent nmethods for
1226 // deoptimization. nmethod dependencies are actually <klass, method>
1227 // pairs but we really only care about the klass part for purposes of
1228 // finding nmethods which might need to be deoptimized. Instead of
1229 // recording the method, a count of how many times a particular nmethod
1230 // was recorded is kept. This ensures that any recording errors are
1231 // noticed since an nmethod should be removed as many times are it's
1232 // added.
1233 //
1234 class nmethodBucket: public CHeapObj<mtClass> {
1235 friend class VMStructs;
1236 private:
1237 nmethod* _nmethod;
1238 int _count;
1239 nmethodBucket* _next;
1240
1241 public:
1242 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1243 _nmethod = nmethod;
1244 _next = next;
1245 _count = 1;
1246 }
1247 int count() { return _count; }
1248 int increment() { _count += 1; return _count; }
1249 int decrement();
1250 nmethodBucket* next() { return _next; }
1251 void set_next(nmethodBucket* b) { _next = b; }
1252 nmethod* get_nmethod() { return _nmethod; }
1253 };
1254
1255 // An iterator that's used to access the inner classes indices in the
1256 // InstanceKlass::_inner_classes array.
1257 class InnerClassesIterator : public StackObj {
1258 private:
1259 Array<jushort>* _inner_classes;
1260 int _length;
1261 int _idx;
1262 public:
1263
1264 InnerClassesIterator(instanceKlassHandle k) {
1265 _inner_classes = k->inner_classes();
1266 if (k->inner_classes() != NULL) {
1267 _length = _inner_classes->length();
1268 // The inner class array's length should be the multiple of
1269 // inner_class_next_offset if it only contains the InnerClasses
1270 // attribute data, or it should be
1271 // n*inner_class_next_offset+enclosing_method_attribute_size
1272 // if it also contains the EnclosingMethod data.
1273 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1274 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1275 "just checking");
1276 // Remove the enclosing_method portion if exists.
1277 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1278 _length -= InstanceKlass::enclosing_method_attribute_size;
1279 }
1280 } else {
1281 _length = 0;
1282 }
1283 _idx = 0;
1284 }
1285
1286 int length() const {
1287 return _length;
1288 }
1289
1290 void next() {
1291 _idx += InstanceKlass::inner_class_next_offset;
1292 }
1293
1294 bool done() const {
1295 return (_idx >= _length);
1296 }
1297
1298 u2 inner_class_info_index() const {
1299 return _inner_classes->at(
1300 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1301 }
1302
1303 void set_inner_class_info_index(u2 index) {
1304 _inner_classes->at_put(
1305 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1306 }
1307
1308 u2 outer_class_info_index() const {
1309 return _inner_classes->at(
1310 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1311 }
1312
1313 void set_outer_class_info_index(u2 index) {
1314 _inner_classes->at_put(
1315 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1316 }
1317
1318 u2 inner_name_index() const {
1319 return _inner_classes->at(
1320 _idx + InstanceKlass::inner_class_inner_name_offset);
1321 }
1322
1323 void set_inner_name_index(u2 index) {
1324 _inner_classes->at_put(
1325 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1326 }
1327
1328 u2 inner_access_flags() const {
1329 return _inner_classes->at(
1330 _idx + InstanceKlass::inner_class_access_flags_offset);
1331 }
1332 };
1333
1334 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP