1 /*
2 * Copyright (c) 1997, 2012, 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 "oops/annotations.hpp"
30 #include "oops/constMethod.hpp"
31 #include "oops/fieldInfo.hpp"
32 #include "oops/instanceOop.hpp"
33 #include "oops/klassVtable.hpp"
34 #include "runtime/handles.hpp"
35 #include "runtime/os.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/bitMap.inline.hpp"
38
39 // An InstanceKlass is the VM level representation of a Java class.
40 // It contains all information needed for at class at execution runtime.
41
42 // InstanceKlass layout:
43 // [C++ vtbl pointer ] Klass
44 // [subtype cache ] Klass
45 // [instance size ] Klass
46 // [java mirror ] Klass
47 // [super ] Klass
48 // [access_flags ] Klass
49 // [name ] Klass
50 // [first subklass ] Klass
51 // [next sibling ] Klass
52 // [array klasses ]
53 // [methods ]
54 // [local interfaces ]
55 // [transitive interfaces ]
56 // [fields ]
57 // [constants ]
58 // [class loader ]
59 // [protection domain ]
60 // [signers ]
61 // [source file name ]
62 // [inner classes ]
63 // [static field size ]
64 // [nonstatic field size ]
65 // [static oop fields size ]
66 // [nonstatic oop maps size ]
67 // [has finalize method ]
68 // [deoptimization mark bit ]
69 // [initialization state ]
70 // [initializing thread ]
71 // [Java vtable length ]
72 // [oop map cache (stack maps) ]
73 // [EMBEDDED Java vtable ] size in words = vtable_len
74 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
75 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
76 // indicating where oops are located in instances of this klass.
77 // [EMBEDDED implementor of the interface] only exist for interface
78 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
79
80
81 // forward declaration for class -- see below for definition
82 class SuperTypeClosure;
83 class JNIid;
84 class jniIdMapBase;
85 class BreakpointInfo;
86 class fieldDescriptor;
87 class DepChange;
88 class nmethodBucket;
89 class PreviousVersionNode;
90 class JvmtiCachedClassFieldMap;
91
92 // This is used in iterators below.
93 class FieldClosure: public StackObj {
94 public:
95 virtual void do_field(fieldDescriptor* fd) = 0;
96 };
97
98 #ifndef PRODUCT
99 // Print fields.
100 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
101 class FieldPrinter: public FieldClosure {
102 oop _obj;
103 outputStream* _st;
104 public:
105 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
106 void do_field(fieldDescriptor* fd);
107 };
108 #endif // !PRODUCT
109
110 // ValueObjs embedded in klass. Describes where oops are located in instances of
111 // this klass.
112 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
113 public:
114 // Byte offset of the first oop mapped by this block.
115 int offset() const { return _offset; }
116 void set_offset(int offset) { _offset = offset; }
117
118 // Number of oops in this block.
119 uint count() const { return _count; }
120 void set_count(uint count) { _count = count; }
121
122 // sizeof(OopMapBlock) in HeapWords.
123 static const int size_in_words() {
124 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
125 LogHeapWordSize;
126 }
127
128 private:
129 int _offset;
130 uint _count;
131 };
132
133 class InstanceKlass: public Klass {
134 friend class VMStructs;
135 friend class ClassFileParser;
136 friend class CompileReplay;
137
138 protected:
139 // Constructor
140 InstanceKlass(int vtable_len,
141 int itable_len,
142 int static_field_size,
143 int nonstatic_oop_map_size,
144 ReferenceType rt,
145 AccessFlags access_flags,
146 bool is_anonymous);
147 public:
148 static Klass* allocate_instance_klass(ClassLoaderData* loader_data,
149 int vtable_len,
150 int itable_len,
151 int static_field_size,
152 int nonstatic_oop_map_size,
153 ReferenceType rt,
154 AccessFlags access_flags,
155 Symbol* name,
156 Klass* super_klass,
157 KlassHandle host_klass,
158 TRAPS);
159
160 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
161
162 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
163 // of the class loading & initialization procedure, and the use of the states.
164 enum ClassState {
165 allocated, // allocated (but not yet linked)
166 loaded, // loaded and inserted in class hierarchy (but not linked yet)
167 linked, // successfully linked/verified (but not initialized yet)
168 being_initialized, // currently running class initializer
169 fully_initialized, // initialized (successfull final state)
170 initialization_error // error happened during initialization
171 };
172
173 protected:
174 // Protection domain.
175 oop _protection_domain;
176 // Class signers.
177 objArrayOop _signers;
178 // Initialization lock. Must be one per class and it has to be a VM internal
179 // object so java code cannot lock it (like the mirror)
180 // It has to be an object not a Mutex because it's held through java calls.
181 volatile oop _init_lock;
182
183 // Annotations for this class
184 Annotations* _annotations;
185 // Array classes holding elements of this class.
186 Klass* _array_klasses;
187 // Constant pool for this class.
188 ConstantPool* _constants;
189 // The InnerClasses attribute and EnclosingMethod attribute. The
190 // _inner_classes is an array of shorts. If the class has InnerClasses
191 // attribute, then the _inner_classes array begins with 4-tuples of shorts
192 // [inner_class_info_index, outer_class_info_index,
193 // inner_name_index, inner_class_access_flags] for the InnerClasses
194 // attribute. If the EnclosingMethod attribute exists, it occupies the
195 // last two shorts [class_index, method_index] of the array. If only
196 // the InnerClasses attribute exists, the _inner_classes array length is
197 // number_of_inner_classes * 4. If the class has both InnerClasses
198 // and EnclosingMethod attributes the _inner_classes array length is
199 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
200 Array<jushort>* _inner_classes;
201
202 // Name of source file containing this klass, NULL if not specified.
203 Symbol* _source_file_name;
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 // Generic signature, or null if none.
209 Symbol* _generic_signature;
210 // Array name derived from this class which needs unreferencing
211 // if this class is unloaded.
212 Symbol* _array_name;
213
214 // Number of heapOopSize words used by non-static fields in this klass
215 // (including inherited fields but after header_size()).
216 int _nonstatic_field_size;
217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
218 u2 _static_oop_field_count;// number of static oop fields in this klass
219 u2 _java_fields_count; // The number of declared Java fields
220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
221
222 bool _is_marked_dependent; // used for marking during flushing and deoptimization
223 // true if class, superclass, or implemented interfaces have default methods
224 bool _has_default_methods;
225
226 enum {
227 _misc_rewritten = 1 << 0, // methods rewritten.
228 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
229 _misc_should_verify_class = 1 << 2, // allow caching of preverification
230 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field
231 };
232 u2 _misc_flags;
233 u2 _minor_version; // minor version number of class file
234 u2 _major_version; // major version number of class file
235 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
236 int _vtable_len; // length of Java vtable (in words)
237 int _itable_len; // length of Java itable (in words)
238 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
239 JNIid* _jni_ids; // First JNI identifier for static fields in this class
240 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
241 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
242 nmethodBucket* _dependencies; // list of dependent nmethods
243 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
244 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
245 // Array of interesting part(s) of the previous version(s) of this
246 // InstanceKlass. See PreviousVersionWalker below.
247 GrowableArray<PreviousVersionNode *>* _previous_versions;
248 // JVMTI fields can be moved to their own structure - see 6315920
249 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
250 jint _cached_class_file_len; // JVMTI: length of above
251 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
252
253 // Method array.
254 Array<Method*>* _methods;
255 // Interface (Klass*s) this class declares locally to implement.
256 Array<Klass*>* _local_interfaces;
257 // Interface (Klass*s) this class implements transitively.
258 Array<Klass*>* _transitive_interfaces;
259 // Int array containing the original order of method in the class file (for JVMTI).
260 Array<int>* _method_ordering;
261 // Instance and static variable information, starts with 6-tuples of shorts
262 // [access, name index, sig index, initval index, low_offset, high_offset]
263 // for all fields, followed by the generic signature data at the end of
264 // the array. Only fields with generic signature attributes have the generic
265 // signature data set in the array. The fields array looks like following:
266 //
267 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
268 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
269 // ...
270 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
271 // [generic signature index]
272 // [generic signature index]
273 // ...
274 Array<u2>* _fields;
275
276 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
277
278 // Class states are defined as ClassState (see above).
279 // Place the _init_state here to utilize the unused 2-byte after
280 // _idnum_allocated_count.
281 u1 _init_state; // state of class
282
283 u1 _reference_type; // reference type
284
285 // embedded Java vtable follows here
286 // embedded Java itables follows here
287 // embedded static fields follows here
288 // embedded nonstatic oop-map blocks follows here
289 // embedded implementor of this interface follows here
290 // The embedded implementor only exists if the current klass is an
291 // iterface. The possible values of the implementor fall into following
292 // three cases:
293 // NULL: no implementor.
294 // A Klass* that's not itself: one implementor.
295 // Itsef: more than one implementors.
296 // embedded host klass follows here
297 // The embedded host klass only exists in an anonymous class for
298 // dynamic language support (JSR 292 enabled). The host class grants
299 // its access privileges to this class also. The host class is either
300 // named, or a previously loaded anonymous class. A non-anonymous class
301 // or an anonymous class loaded through normal classloading does not
302 // have this embedded field.
303 //
304
305 friend class SystemDictionary;
306
307 public:
308 bool has_nonstatic_fields() const {
309 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
310 }
311 void set_has_nonstatic_fields(bool b) {
312 if (b) {
313 _misc_flags |= _misc_has_nonstatic_fields;
314 } else {
315 _misc_flags &= ~_misc_has_nonstatic_fields;
316 }
317 }
318
319 // field sizes
320 int nonstatic_field_size() const { return _nonstatic_field_size; }
321 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
322
323 int static_field_size() const { return _static_field_size; }
324 void set_static_field_size(int size) { _static_field_size = size; }
325
326 int static_oop_field_count() const { return (int)_static_oop_field_count; }
327 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
328
329 // Java vtable
330 int vtable_length() const { return _vtable_len; }
331 void set_vtable_length(int len) { _vtable_len = len; }
332
333 // Java itable
334 int itable_length() const { return _itable_len; }
335 void set_itable_length(int len) { _itable_len = len; }
336
337 // array klasses
338 Klass* array_klasses() const { return _array_klasses; }
339 void set_array_klasses(Klass* k) { _array_klasses = k; }
340
341 // methods
342 Array<Method*>* methods() const { return _methods; }
343 void set_methods(Array<Method*>* a) { _methods = a; }
344 Method* method_with_idnum(int idnum);
345
346 // method ordering
347 Array<int>* method_ordering() const { return _method_ordering; }
348 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
349
350 // interfaces
351 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
352 void set_local_interfaces(Array<Klass*>* a) {
353 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
354 _local_interfaces = a; }
355 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
356 void set_transitive_interfaces(Array<Klass*>* a) {
357 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
358 _transitive_interfaces = a; }
359
360 private:
361 friend class fieldDescriptor;
362 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
363
364 public:
365 int field_offset (int index) const { return field(index)->offset(); }
366 int field_access_flags(int index) const { return field(index)->access_flags(); }
367 Symbol* field_name (int index) const { return field(index)->name(constants()); }
368 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
369
370 // Number of Java declared fields
371 int java_fields_count() const { return (int)_java_fields_count; }
372
373 Array<u2>* fields() const { return _fields; }
374
375 void set_fields(Array<u2>* f, u2 java_fields_count) {
376 guarantee(_fields == NULL || f == NULL, "Just checking");
377 _fields = f;
378 _java_fields_count = java_fields_count;
379 }
380
381 // inner classes
382 Array<u2>* inner_classes() const { return _inner_classes; }
383 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
384
385 enum InnerClassAttributeOffset {
386 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
387 inner_class_inner_class_info_offset = 0,
388 inner_class_outer_class_info_offset = 1,
389 inner_class_inner_name_offset = 2,
390 inner_class_access_flags_offset = 3,
391 inner_class_next_offset = 4
392 };
393
394 enum EnclosingMethodAttributeOffset {
395 enclosing_method_class_index_offset = 0,
396 enclosing_method_method_index_offset = 1,
397 enclosing_method_attribute_size = 2
398 };
399
400 // method override check
401 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
402
403 // package
404 bool is_same_class_package(Klass* class2);
405 bool is_same_class_package(oop classloader2, Symbol* classname2);
406 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
407
408 // find an enclosing class (defined where original code was, in jvm.cpp!)
409 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
410 instanceKlassHandle self(THREAD, this);
411 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
412 }
413 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
414 bool* inner_is_member, TRAPS);
415
416 // tell if two classes have the same enclosing class (at package level)
417 bool is_same_package_member(Klass* class2, TRAPS) {
418 instanceKlassHandle self(THREAD, this);
419 return is_same_package_member_impl(self, class2, THREAD);
420 }
421 static bool is_same_package_member_impl(instanceKlassHandle self,
422 Klass* class2, TRAPS);
423
424 // initialization state
425 bool is_loaded() const { return _init_state >= loaded; }
426 bool is_linked() const { return _init_state >= linked; }
427 bool is_initialized() const { return _init_state == fully_initialized; }
428 bool is_not_initialized() const { return _init_state < being_initialized; }
429 bool is_being_initialized() const { return _init_state == being_initialized; }
430 bool is_in_error_state() const { return _init_state == initialization_error; }
431 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
432 ClassState init_state() { return (ClassState)_init_state; }
433 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
434
435 // defineClass specified verification
436 bool should_verify_class() const {
437 return (_misc_flags & _misc_should_verify_class) != 0;
438 }
439 void set_should_verify_class(bool value) {
440 if (value) {
441 _misc_flags |= _misc_should_verify_class;
442 } else {
443 _misc_flags &= ~_misc_should_verify_class;
444 }
445 }
446
447 // marking
448 bool is_marked_dependent() const { return _is_marked_dependent; }
449 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
450
451 // initialization (virtuals from Klass)
452 bool should_be_initialized() const; // means that initialize should be called
453 void initialize(TRAPS);
454 void link_class(TRAPS);
455 bool link_class_or_fail(TRAPS); // returns false on failure
456 void unlink_class();
457 void rewrite_class(TRAPS);
458 void relocate_and_link_methods(TRAPS);
459 Method* class_initializer();
460
461 // set the class to initialized if no static initializer is present
462 void eager_initialize(Thread *thread);
463
464 // reference type
465 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
466 void set_reference_type(ReferenceType t) {
467 assert(t == (u1)t, "overflow");
468 _reference_type = (u1)t;
469 }
470
471 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
472
473 // find local field, returns true if found
474 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
475 // find field in direct superinterfaces, returns the interface in which the field is defined
476 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
477 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
478 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
479 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
480 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
481
482 // find a non-static or static field given its offset within the class.
483 bool contains_field_offset(int offset) {
484 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
485 }
486
487 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
488 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
489
490 // find a local method (returns NULL if not found)
491 Method* find_method(Symbol* name, Symbol* signature) const;
492 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
493
494 // lookup operation (returns NULL if not found)
495 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
496
497 // lookup a method in all the interfaces that this class implements
498 // (returns NULL if not found)
499 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
500
501 // Find method indices by name. If a method with the specified name is
502 // found the index to the first method is returned, and 'end' is filled in
503 // with the index of first non-name-matching method. If no method is found
504 // -1 is returned.
505 int find_method_by_name(Symbol* name, int* end);
506 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
507
508 // constant pool
509 ConstantPool* constants() const { return _constants; }
510 void set_constants(ConstantPool* c) { _constants = c; }
511
512 // protection domain
513 oop protection_domain() { return _protection_domain; }
514 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
515
516 // host class
517 Klass* host_klass() const {
518 Klass** hk = (Klass**)adr_host_klass();
519 if (hk == NULL) {
520 return NULL;
521 } else {
522 return *hk;
523 }
524 }
525 void set_host_klass(Klass* host) {
526 assert(is_anonymous(), "not anonymous");
527 Klass** addr = (Klass**)adr_host_klass();
528 assert(addr != NULL, "no reversed space");
529 *addr = host;
530 }
531 bool is_anonymous() const {
532 return (_misc_flags & _misc_is_anonymous) != 0;
533 }
534 void set_is_anonymous(bool value) {
535 if (value) {
536 _misc_flags |= _misc_is_anonymous;
537 } else {
538 _misc_flags &= ~_misc_is_anonymous;
539 }
540 }
541
542 // Oop that keeps the metadata for this class from being unloaded
543 // in places where the metadata is stored in other places, like nmethods
544 oop klass_holder() const {
545 return is_anonymous() ? java_mirror() : class_loader();
546 }
547
548 // signers
549 objArrayOop signers() const { return _signers; }
550 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
551
552 // source file name
553 Symbol* source_file_name() const { return _source_file_name; }
554 void set_source_file_name(Symbol* n);
555
556 // minor and major version numbers of class file
557 u2 minor_version() const { return _minor_version; }
558 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
559 u2 major_version() const { return _major_version; }
560 void set_major_version(u2 major_version) { _major_version = major_version; }
561
562 // source debug extension
563 char* source_debug_extension() const { return _source_debug_extension; }
564 void set_source_debug_extension(char* array, int length);
565
566 // symbol unloading support (refcount already added)
567 Symbol* array_name() { return _array_name; }
568 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
569
570 // nonstatic oop-map blocks
571 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
572 return oop_map_count * OopMapBlock::size_in_words();
573 }
574 unsigned int nonstatic_oop_map_count() const {
575 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
576 }
577 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
578 void set_nonstatic_oop_map_size(int words) {
579 _nonstatic_oop_map_size = words;
580 }
581
582 // RedefineClasses() support for previous versions:
583 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
584 int emcp_method_count);
585 // If the _previous_versions array is non-NULL, then this klass
586 // has been redefined at least once even if we aren't currently
587 // tracking a previous version.
588 bool has_been_redefined() const { return _previous_versions != NULL; }
589 bool has_previous_version() const;
590 void init_previous_versions() {
591 _previous_versions = NULL;
592 }
593 GrowableArray<PreviousVersionNode *>* previous_versions() const {
594 return _previous_versions;
595 }
596
597 static void purge_previous_versions(InstanceKlass* ik);
598
599 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
600 void set_cached_class_file(unsigned char *class_file_bytes,
601 jint class_file_len) { _cached_class_file_len = class_file_len;
602 _cached_class_file_bytes = class_file_bytes; }
603 jint get_cached_class_file_len() { return _cached_class_file_len; }
604 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
605
606 // JVMTI: Support for caching of field indices, types, and offsets
607 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
608 _jvmti_cached_class_field_map = descriptor;
609 }
610 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
611 return _jvmti_cached_class_field_map;
612 }
613
614 bool has_default_methods() const { return _has_default_methods; }
615 void set_has_default_methods(bool b) { _has_default_methods = b; }
616
617 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
618 inline u2 next_method_idnum();
619 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
620
621 // generics support
622 Symbol* generic_signature() const { return _generic_signature; }
623 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
624
625 u2 enclosing_method_data(int offset);
626 u2 enclosing_method_class_index() {
627 return enclosing_method_data(enclosing_method_class_index_offset);
628 }
629 u2 enclosing_method_method_index() {
630 return enclosing_method_data(enclosing_method_method_index_offset);
631 }
632 void set_enclosing_method_indices(u2 class_index,
633 u2 method_index);
634
635 // jmethodID support
636 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
637 methodHandle method_h);
638 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
639 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
640 jmethodID* to_dealloc_id_p,
641 jmethodID** to_dealloc_jmeths_p);
642 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
643 size_t *length_p, jmethodID* id_p);
644 jmethodID jmethod_id_or_null(Method* method);
645
646 // cached itable index support
647 void set_cached_itable_index(size_t idnum, int index);
648 int cached_itable_index(size_t idnum);
649
650 // annotations support
651 Annotations* annotations() const { return _annotations; }
652 void set_annotations(Annotations* anno) { _annotations = anno; }
653 AnnotationArray* class_annotations() const {
654 if (annotations() == NULL) return NULL;
655 return annotations()->class_annotations();
656 }
657 Array<AnnotationArray*>* fields_annotations() const {
658 if (annotations() == NULL) return NULL;
659 return annotations()->fields_annotations();
660 }
661
662 // allocation
663 instanceOop allocate_instance(TRAPS);
664
665 // additional member function to return a handle
666 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
667
668 objArrayOop allocate_objArray(int n, int length, TRAPS);
669 // Helper function
670 static instanceOop register_finalizer(instanceOop i, TRAPS);
671
672 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
673 // if not, throw either an Error or an Exception.
674 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
675
676 // initialization
677 void call_class_initializer(TRAPS);
678 void set_initialization_state_and_notify(ClassState state, TRAPS);
679
680 // OopMapCache support
681 OopMapCache* oop_map_cache() { return _oop_map_cache; }
682 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
683 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
684
685 // JNI identifier support (for static fields - for jni performance)
686 JNIid* jni_ids() { return _jni_ids; }
687 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
688 JNIid* jni_id_for(int offset);
689
690 // maintenance of deoptimization dependencies
691 int mark_dependent_nmethods(DepChange& changes);
692 void add_dependent_nmethod(nmethod* nm);
693 void remove_dependent_nmethod(nmethod* nm);
694
695 // On-stack replacement support
696 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
697 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
698 void add_osr_nmethod(nmethod* n);
699 void remove_osr_nmethod(nmethod* n);
700 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
701
702 // Breakpoint support (see methods on Method* for details)
703 BreakpointInfo* breakpoints() const { return _breakpoints; };
704 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
705
706 // support for stub routines
707 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
708 TRACE_DEFINE_OFFSET;
709 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
710
711 // subclass/subinterface checks
712 bool implements_interface(Klass* k) const;
713
714 // Access to the implementor of an interface.
715 Klass* implementor() const
716 {
717 Klass** k = adr_implementor();
718 if (k == NULL) {
719 return NULL;
720 } else {
721 return *k;
722 }
723 }
724
725 void set_implementor(Klass* k) {
726 assert(is_interface(), "not interface");
727 Klass** addr = adr_implementor();
728 *addr = k;
729 }
730
731 int nof_implementors() const {
732 Klass* k = implementor();
733 if (k == NULL) {
734 return 0;
735 } else if (k != this) {
736 return 1;
737 } else {
738 return 2;
739 }
740 }
741
742 void add_implementor(Klass* k); // k is a new class that implements this interface
743 void init_implementor(); // initialize
744
745 // link this class into the implementors list of every interface it implements
746 void process_interfaces(Thread *thread);
747
748 // virtual operations from Klass
749 bool is_leaf_class() const { return _subklass == NULL; }
750 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
751 bool compute_is_subtype_of(Klass* k);
752 bool can_be_primary_super_slow() const;
753 int oop_size(oop obj) const { return size_helper(); }
754 bool oop_is_instance_slow() const { return true; }
755
756 // Iterators
757 void do_local_static_fields(FieldClosure* cl);
758 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
759 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
760
761 void methods_do(void f(Method* method));
762 void array_klasses_do(void f(Klass* k));
763 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
764 void with_array_klasses_do(void f(Klass* k));
765 bool super_types_do(SuperTypeClosure* blk);
766
767 // Casting from Klass*
768 static InstanceKlass* cast(Klass* k) {
769 assert(k->is_klass(), "must be");
770 assert(k->oop_is_instance(), "cast to InstanceKlass");
771 return (InstanceKlass*) k;
772 }
773
774 InstanceKlass* java_super() const {
775 return (super() == NULL) ? NULL : cast(super());
776 }
777
778 // Sizing (in words)
779 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
780 static int size(int vtable_length, int itable_length,
781 int nonstatic_oop_map_size,
782 bool is_interface, bool is_anonymous) {
783 return align_object_size(header_size() +
784 align_object_offset(vtable_length) +
785 align_object_offset(itable_length) +
786 ((is_interface || is_anonymous) ?
787 align_object_offset(nonstatic_oop_map_size) :
788 nonstatic_oop_map_size) +
789 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
790 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
791 }
792 int size() const { return size(vtable_length(),
793 itable_length(),
794 nonstatic_oop_map_size(),
795 is_interface(),
796 is_anonymous());
797 }
798
799 static int vtable_start_offset() { return header_size(); }
800 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
801
802 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
803 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
804 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
805
806 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
807
808 address static_field_addr(int offset);
809
810 OopMapBlock* start_of_nonstatic_oop_maps() const {
811 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
812 }
813
814 Klass** adr_implementor() const {
815 if (is_interface()) {
816 return (Klass**)(start_of_nonstatic_oop_maps() +
817 nonstatic_oop_map_count());
818 } else {
819 return NULL;
820 }
821 };
822
823 Klass** adr_host_klass() const {
824 if (is_anonymous()) {
825 Klass** adr_impl = adr_implementor();
826 if (adr_impl != NULL) {
827 return adr_impl + 1;
828 } else {
829 return (Klass**)(start_of_nonstatic_oop_maps() +
830 nonstatic_oop_map_count());
831 }
832 } else {
833 return NULL;
834 }
835 }
836
837 // Allocation profiling support
838 juint alloc_size() const { return _alloc_count * size_helper(); }
839 void set_alloc_size(juint n) {}
840
841 // Use this to return the size of an instance in heap words:
842 int size_helper() const {
843 return layout_helper_to_size_helper(layout_helper());
844 }
845
846 // This bit is initialized in classFileParser.cpp.
847 // It is false under any of the following conditions:
848 // - the class is abstract (including any interface)
849 // - the class has a finalizer (if !RegisterFinalizersAtInit)
850 // - the class size is larger than FastAllocateSizeLimit
851 // - the class is java/lang/Class, which cannot be allocated directly
852 bool can_be_fastpath_allocated() const {
853 return !layout_helper_needs_slow_path(layout_helper());
854 }
855
856 // Java vtable/itable
857 klassVtable* vtable() const; // return new klassVtable wrapper
858 inline Method* method_at_vtable(int index);
859 klassItable* itable() const; // return new klassItable wrapper
860 Method* method_at_itable(Klass* holder, int index, TRAPS);
861
862 // Garbage collection
863 virtual void oops_do(OopClosure* cl);
864
865 void oop_follow_contents(oop obj);
866 int oop_adjust_pointers(oop obj);
867
868 void clean_implementors_list(BoolObjectClosure* is_alive);
869 void clean_method_data(BoolObjectClosure* is_alive);
870
871 // Explicit metaspace deallocation of fields
872 // For RedefineClasses, we need to deallocate instanceKlasses
873 void deallocate_contents(ClassLoaderData* loader_data);
874
875 // The constant pool is on stack if any of the methods are executing or
876 // referenced by handles.
877 bool on_stack() const { return _constants->on_stack(); }
878
879 void release_C_heap_structures();
880
881 // Parallel Scavenge and Parallel Old
882 PARALLEL_GC_DECLS
883
884 // Naming
885 const char* signature_name() const;
886
887 // Iterators
888 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
889 return oop_oop_iterate_v(obj, blk);
890 }
891
892 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
893 return oop_oop_iterate_v_m(obj, blk, mr);
894 }
895
896 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
897 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
898 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
899 MemRegion mr);
900
901 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
902 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
903
904 #ifndef SERIALGC
905 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
906 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
907
908 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
909 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
910 #endif // !SERIALGC
911
912 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
913 private:
914 // initialization state
915 #ifdef ASSERT
916 void set_init_state(ClassState state);
917 #else
918 void set_init_state(ClassState state) { _init_state = (u1)state; }
919 #endif
920 void set_rewritten() { _misc_flags |= _misc_rewritten; }
921 void set_init_thread(Thread *thread) { _init_thread = thread; }
922
923 // The RedefineClasses() API can cause new method idnums to be needed
924 // which will cause the caches to grow. Safety requires different
925 // cache management logic if the caches can grow instead of just
926 // going from NULL to non-NULL.
927 bool idnum_can_increment() const { return has_been_redefined(); }
928 jmethodID* methods_jmethod_ids_acquire() const
929 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
930 void release_set_methods_jmethod_ids(jmethodID* jmeths)
931 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
932
933 int* methods_cached_itable_indices_acquire() const
934 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
935 void release_set_methods_cached_itable_indices(int* indices)
936 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
937
938 // Lock during initialization
939 volatile oop init_lock() const;
940 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
941 void fence_and_clear_init_lock(); // after fully_initialized
942
943 // Offsets for memory management
944 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
945 oop* adr_signers() const { return (oop*)&this->_signers;}
946 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
947
948 // Static methods that are used to implement member methods where an exposed this pointer
949 // is needed due to possible GCs
950 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
951 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
952 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
953 static void eager_initialize_impl (instanceKlassHandle this_oop);
954 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
955 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
956 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
957 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
958 /* jni_id_for_impl for jfieldID only */
959 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
960
961 // Returns the array class for the n'th dimension
962 Klass* array_klass_impl(bool or_null, int n, TRAPS);
963
964 // Returns the array class with this class as element type
965 Klass* array_klass_impl(bool or_null, TRAPS);
966
967 public:
968 // CDS support - remove and restore oops from metadata. Oops are not shared.
969 virtual void remove_unshareable_info();
970 virtual void restore_unshareable_info(TRAPS);
971
972 // jvm support
973 jint compute_modifier_flags(TRAPS) const;
974
975 public:
976 // JVMTI support
977 jint jvmti_class_status() const;
978
979 public:
980 // Printing
981 #ifndef PRODUCT
982 void print_on(outputStream* st) const;
983 #endif
984 void print_value_on(outputStream* st) const;
985
986 void oop_print_value_on(oop obj, outputStream* st);
987
988 #ifndef PRODUCT
989 void oop_print_on (oop obj, outputStream* st);
990
991 void print_dependent_nmethods(bool verbose = false);
992 bool is_dependent_nmethod(nmethod* nm);
993 #endif
994
995 const char* internal_name() const;
996
997 // Verification
998 void verify_on(outputStream* st);
999
1000 void oop_verify_on(oop obj, outputStream* st);
1001 };
1002
1003 inline Method* InstanceKlass::method_at_vtable(int index) {
1004 #ifndef PRODUCT
1005 assert(index >= 0, "valid vtable index");
1006 if (DebugVtables) {
1007 verify_vtable_index(index);
1008 }
1009 #endif
1010 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1011 return ve[index].method();
1012 }
1013
1014 // for adding methods
1015 // UNSET_IDNUM return means no more ids available
1016 inline u2 InstanceKlass::next_method_idnum() {
1017 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1018 return ConstMethod::UNSET_IDNUM; // no more ids available
1019 } else {
1020 return _idnum_allocated_count++;
1021 }
1022 }
1023
1024
1025 /* JNIid class for jfieldIDs only */
1026 class JNIid: public CHeapObj<mtClass> {
1027 friend class VMStructs;
1028 private:
1029 Klass* _holder;
1030 JNIid* _next;
1031 int _offset;
1032 #ifdef ASSERT
1033 bool _is_static_field_id;
1034 #endif
1035
1036 public:
1037 // Accessors
1038 Klass* holder() const { return _holder; }
1039 int offset() const { return _offset; }
1040 JNIid* next() { return _next; }
1041 // Constructor
1042 JNIid(Klass* holder, int offset, JNIid* next);
1043 // Identifier lookup
1044 JNIid* find(int offset);
1045
1046 bool find_local_field(fieldDescriptor* fd) {
1047 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1048 }
1049
1050 static void deallocate(JNIid* id);
1051 // Debugging
1052 #ifdef ASSERT
1053 bool is_static_field_id() const { return _is_static_field_id; }
1054 void set_is_static_field_id() { _is_static_field_id = true; }
1055 #endif
1056 void verify(Klass* holder);
1057 };
1058
1059
1060 // If breakpoints are more numerous than just JVMTI breakpoints,
1061 // consider compressing this data structure.
1062 // It is currently a simple linked list defined in method.hpp.
1063
1064 class BreakpointInfo;
1065
1066
1067 // A collection point for interesting information about the previous
1068 // version(s) of an InstanceKlass. This class uses weak references to
1069 // the information so that the information may be collected as needed
1070 // by the system. If the information is shared, then a regular
1071 // reference must be used because a weak reference would be seen as
1072 // collectible. A GrowableArray of PreviousVersionNodes is attached
1073 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1074 class PreviousVersionNode : public CHeapObj<mtClass> {
1075 private:
1076 // A shared ConstantPool is never collected so we'll always have
1077 // a reference to it so we can update items in the cache. We'll
1078 // have a weak reference to a non-shared ConstantPool until all
1079 // of the methods (EMCP or obsolete) have been collected; the
1080 // non-shared ConstantPool becomes collectible at that point.
1081 ConstantPool* _prev_constant_pool; // regular or weak reference
1082 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1083
1084 // If the previous version of the InstanceKlass doesn't have any
1085 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1086 // EMCP methods have been collected, then _prev_EMCP_methods can
1087 // have a length of zero.
1088 GrowableArray<Method*>* _prev_EMCP_methods;
1089
1090 public:
1091 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1092 GrowableArray<Method*>* prev_EMCP_methods);
1093 ~PreviousVersionNode();
1094 ConstantPool* prev_constant_pool() const {
1095 return _prev_constant_pool;
1096 }
1097 GrowableArray<Method*>* prev_EMCP_methods() const {
1098 return _prev_EMCP_methods;
1099 }
1100 };
1101
1102
1103 // A Handle-ized version of PreviousVersionNode.
1104 class PreviousVersionInfo : public ResourceObj {
1105 private:
1106 constantPoolHandle _prev_constant_pool_handle;
1107 // If the previous version of the InstanceKlass doesn't have any
1108 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1109 // methods cannot be collected while we hold a handle,
1110 // _prev_EMCP_methods should never have a length of zero.
1111 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1112
1113 public:
1114 PreviousVersionInfo(PreviousVersionNode *pv_node);
1115 ~PreviousVersionInfo();
1116 constantPoolHandle prev_constant_pool_handle() const {
1117 return _prev_constant_pool_handle;
1118 }
1119 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1120 return _prev_EMCP_method_handles;
1121 }
1122 };
1123
1124
1125 // Helper object for walking previous versions. This helper cleans up
1126 // the Handles that it allocates when the helper object is destroyed.
1127 // The PreviousVersionInfo object returned by next_previous_version()
1128 // is only valid until a subsequent call to next_previous_version() or
1129 // the helper object is destroyed.
1130 class PreviousVersionWalker : public StackObj {
1131 private:
1132 GrowableArray<PreviousVersionNode *>* _previous_versions;
1133 int _current_index;
1134 // Fields for cleaning up when we are done walking the previous versions:
1135 // A HandleMark for the PreviousVersionInfo handles:
1136 HandleMark _hm;
1137
1138 // It would be nice to have a ResourceMark field in this helper also,
1139 // but the ResourceMark code says to be careful to delete handles held
1140 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1141 // can't guarantee the order in which the fields are destroyed, we
1142 // have to let the creator of the PreviousVersionWalker object do
1143 // the right thing. Also, adding a ResourceMark here causes an
1144 // include loop.
1145
1146 // A pointer to the current info object so we can handle the deletes.
1147 PreviousVersionInfo * _current_p;
1148
1149 public:
1150 PreviousVersionWalker(InstanceKlass *ik);
1151 ~PreviousVersionWalker();
1152
1153 // Return the interesting information for the next previous version
1154 // of the klass. Returns NULL if there are no more previous versions.
1155 PreviousVersionInfo* next_previous_version();
1156 };
1157
1158
1159 //
1160 // nmethodBucket is used to record dependent nmethods for
1161 // deoptimization. nmethod dependencies are actually <klass, method>
1162 // pairs but we really only care about the klass part for purposes of
1163 // finding nmethods which might need to be deoptimized. Instead of
1164 // recording the method, a count of how many times a particular nmethod
1165 // was recorded is kept. This ensures that any recording errors are
1166 // noticed since an nmethod should be removed as many times are it's
1167 // added.
1168 //
1169 class nmethodBucket: public CHeapObj<mtClass> {
1170 friend class VMStructs;
1171 private:
1172 nmethod* _nmethod;
1173 int _count;
1174 nmethodBucket* _next;
1175
1176 public:
1177 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1178 _nmethod = nmethod;
1179 _next = next;
1180 _count = 1;
1181 }
1182 int count() { return _count; }
1183 int increment() { _count += 1; return _count; }
1184 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1185 nmethodBucket* next() { return _next; }
1186 void set_next(nmethodBucket* b) { _next = b; }
1187 nmethod* get_nmethod() { return _nmethod; }
1188 };
1189
1190 // An iterator that's used to access the inner classes indices in the
1191 // InstanceKlass::_inner_classes array.
1192 class InnerClassesIterator : public StackObj {
1193 private:
1194 Array<jushort>* _inner_classes;
1195 int _length;
1196 int _idx;
1197 public:
1198
1199 InnerClassesIterator(instanceKlassHandle k) {
1200 _inner_classes = k->inner_classes();
1201 if (k->inner_classes() != NULL) {
1202 _length = _inner_classes->length();
1203 // The inner class array's length should be the multiple of
1204 // inner_class_next_offset if it only contains the InnerClasses
1205 // attribute data, or it should be
1206 // n*inner_class_next_offset+enclosing_method_attribute_size
1207 // if it also contains the EnclosingMethod data.
1208 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1209 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1210 "just checking");
1211 // Remove the enclosing_method portion if exists.
1212 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1213 _length -= InstanceKlass::enclosing_method_attribute_size;
1214 }
1215 } else {
1216 _length = 0;
1217 }
1218 _idx = 0;
1219 }
1220
1221 int length() const {
1222 return _length;
1223 }
1224
1225 void next() {
1226 _idx += InstanceKlass::inner_class_next_offset;
1227 }
1228
1229 bool done() const {
1230 return (_idx >= _length);
1231 }
1232
1233 u2 inner_class_info_index() const {
1234 return _inner_classes->at(
1235 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1236 }
1237
1238 void set_inner_class_info_index(u2 index) {
1239 _inner_classes->at_put(
1240 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1241 }
1242
1243 u2 outer_class_info_index() const {
1244 return _inner_classes->at(
1245 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1246 }
1247
1248 void set_outer_class_info_index(u2 index) {
1249 _inner_classes->at_put(
1250 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1251 }
1252
1253 u2 inner_name_index() const {
1254 return _inner_classes->at(
1255 _idx + InstanceKlass::inner_class_inner_name_offset);
1256 }
1257
1258 void set_inner_name_index(u2 index) {
1259 _inner_classes->at_put(
1260 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1261 }
1262
1263 u2 inner_access_flags() const {
1264 return _inner_classes->at(
1265 _idx + InstanceKlass::inner_class_access_flags_offset);
1266 }
1267 };
1268
1269 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP