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