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 // _is_marked_dependent can be set concurrently, thus cannot be part of the
223 // _misc_flags.
224 bool _is_marked_dependent; // used for marking during flushing and deoptimization
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 _misc_has_default_methods = 1 << 4 // class/superclass/implemented interfaces has default methods
232 };
233 u2 _misc_flags;
234 u2 _minor_version; // minor version number of class file
235 u2 _major_version; // major version number of class file
236 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
237 int _vtable_len; // length of Java vtable (in words)
238 int _itable_len; // length of Java itable (in words)
239 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
240 JNIid* _jni_ids; // First JNI identifier for static fields in this class
241 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
242 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
243 nmethodBucket* _dependencies; // list of dependent nmethods
244 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
245 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
246 // Array of interesting part(s) of the previous version(s) of this
247 // InstanceKlass. See PreviousVersionWalker below.
248 GrowableArray<PreviousVersionNode *>* _previous_versions;
249 // JVMTI fields can be moved to their own structure - see 6315920
250 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
251 jint _cached_class_file_len; // JVMTI: length of above
252 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
253
254 // Method array.
255 Array<Method*>* _methods;
256 // Interface (Klass*s) this class declares locally to implement.
257 Array<Klass*>* _local_interfaces;
258 // Interface (Klass*s) this class implements transitively.
259 Array<Klass*>* _transitive_interfaces;
260 // Int array containing the original order of method in the class file (for JVMTI).
261 Array<int>* _method_ordering;
262 // Instance and static variable information, starts with 6-tuples of shorts
263 // [access, name index, sig index, initval index, low_offset, high_offset]
264 // for all fields, followed by the generic signature data at the end of
265 // the array. Only fields with generic signature attributes have the generic
266 // signature data set in the array. The fields array looks like following:
267 //
268 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
269 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
270 // ...
271 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
272 // [generic signature index]
273 // [generic signature index]
274 // ...
275 Array<u2>* _fields;
276
277 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
278
279 // Class states are defined as ClassState (see above).
280 // Place the _init_state here to utilize the unused 2-byte after
281 // _idnum_allocated_count.
282 u1 _init_state; // state of class
283
284 u1 _reference_type; // reference type
285
286 // embedded Java vtable follows here
287 // embedded Java itables follows here
288 // embedded static fields follows here
289 // embedded nonstatic oop-map blocks follows here
290 // embedded implementor of this interface follows here
291 // The embedded implementor only exists if the current klass is an
292 // iterface. The possible values of the implementor fall into following
293 // three cases:
294 // NULL: no implementor.
295 // A Klass* that's not itself: one implementor.
296 // Itsef: more than one implementors.
297 // embedded host klass follows here
298 // The embedded host klass only exists in an anonymous class for
299 // dynamic language support (JSR 292 enabled). The host class grants
300 // its access privileges to this class also. The host class is either
301 // named, or a previously loaded anonymous class. A non-anonymous class
302 // or an anonymous class loaded through normal classloading does not
303 // have this embedded field.
304 //
305
306 friend class SystemDictionary;
307
308 public:
309 bool has_nonstatic_fields() const {
310 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
311 }
312 void set_has_nonstatic_fields(bool b) {
313 if (b) {
314 _misc_flags |= _misc_has_nonstatic_fields;
315 } else {
316 _misc_flags &= ~_misc_has_nonstatic_fields;
317 }
318 }
319
320 // field sizes
321 int nonstatic_field_size() const { return _nonstatic_field_size; }
322 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
323
324 int static_field_size() const { return _static_field_size; }
325 void set_static_field_size(int size) { _static_field_size = size; }
326
327 int static_oop_field_count() const { return (int)_static_oop_field_count; }
328 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
329
330 // Java vtable
331 int vtable_length() const { return _vtable_len; }
332 void set_vtable_length(int len) { _vtable_len = len; }
333
334 // Java itable
335 int itable_length() const { return _itable_len; }
336 void set_itable_length(int len) { _itable_len = len; }
337
338 // array klasses
339 Klass* array_klasses() const { return _array_klasses; }
340 void set_array_klasses(Klass* k) { _array_klasses = k; }
341
342 // methods
343 Array<Method*>* methods() const { return _methods; }
344 void set_methods(Array<Method*>* a) { _methods = a; }
345 Method* method_with_idnum(int idnum);
346
347 // method ordering
348 Array<int>* method_ordering() const { return _method_ordering; }
349 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
350
351 // interfaces
352 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
353 void set_local_interfaces(Array<Klass*>* a) {
354 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
355 _local_interfaces = a; }
356 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
357 void set_transitive_interfaces(Array<Klass*>* a) {
358 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
359 _transitive_interfaces = a; }
360
361 private:
362 friend class fieldDescriptor;
363 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
364
365 public:
366 int field_offset (int index) const { return field(index)->offset(); }
367 int field_access_flags(int index) const { return field(index)->access_flags(); }
368 Symbol* field_name (int index) const { return field(index)->name(constants()); }
369 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
370
371 // Number of Java declared fields
372 int java_fields_count() const { return (int)_java_fields_count; }
373
374 Array<u2>* fields() const { return _fields; }
375
376 void set_fields(Array<u2>* f, u2 java_fields_count) {
377 guarantee(_fields == NULL || f == NULL, "Just checking");
378 _fields = f;
379 _java_fields_count = java_fields_count;
380 }
381
382 // inner classes
383 Array<u2>* inner_classes() const { return _inner_classes; }
384 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
385
386 enum InnerClassAttributeOffset {
387 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
388 inner_class_inner_class_info_offset = 0,
389 inner_class_outer_class_info_offset = 1,
390 inner_class_inner_name_offset = 2,
391 inner_class_access_flags_offset = 3,
392 inner_class_next_offset = 4
393 };
394
395 enum EnclosingMethodAttributeOffset {
396 enclosing_method_class_index_offset = 0,
397 enclosing_method_method_index_offset = 1,
398 enclosing_method_attribute_size = 2
399 };
400
401 // method override check
402 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
403
404 // package
405 bool is_same_class_package(Klass* class2);
406 bool is_same_class_package(oop classloader2, Symbol* classname2);
407 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
408
409 // find an enclosing class (defined where original code was, in jvm.cpp!)
410 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
411 instanceKlassHandle self(THREAD, this);
412 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
413 }
414 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
415 bool* inner_is_member, TRAPS);
416
417 // tell if two classes have the same enclosing class (at package level)
418 bool is_same_package_member(Klass* class2, TRAPS) {
419 instanceKlassHandle self(THREAD, this);
420 return is_same_package_member_impl(self, class2, THREAD);
421 }
422 static bool is_same_package_member_impl(instanceKlassHandle self,
423 Klass* class2, TRAPS);
424
425 // initialization state
426 bool is_loaded() const { return _init_state >= loaded; }
427 bool is_linked() const { return _init_state >= linked; }
428 bool is_initialized() const { return _init_state == fully_initialized; }
429 bool is_not_initialized() const { return _init_state < being_initialized; }
430 bool is_being_initialized() const { return _init_state == being_initialized; }
431 bool is_in_error_state() const { return _init_state == initialization_error; }
432 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
433 ClassState init_state() { return (ClassState)_init_state; }
434 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
435
436 // defineClass specified verification
437 bool should_verify_class() const {
438 return (_misc_flags & _misc_should_verify_class) != 0;
439 }
440 void set_should_verify_class(bool value) {
441 if (value) {
442 _misc_flags |= _misc_should_verify_class;
443 } else {
444 _misc_flags &= ~_misc_should_verify_class;
445 }
446 }
447
448 // marking
449 bool is_marked_dependent() const { return _is_marked_dependent; }
450 void set_is_marked_dependent(bool value) { _is_marked_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 relocate_and_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
495 // lookup operation (returns NULL if not found)
496 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
497
498 // lookup a method in all the interfaces that this class implements
499 // (returns NULL if not found)
500 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
501
502 // Find method indices by name. If a method with the specified name is
503 // found the index to the first method is returned, and 'end' is filled in
504 // with the index of first non-name-matching method. If no method is found
505 // -1 is returned.
506 int find_method_by_name(Symbol* name, int* end);
507 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
508
509 // constant pool
510 ConstantPool* constants() const { return _constants; }
511 void set_constants(ConstantPool* c) { _constants = c; }
512
513 // protection domain
514 oop protection_domain() { return _protection_domain; }
515 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
516
517 // host class
518 Klass* host_klass() const {
519 Klass** hk = (Klass**)adr_host_klass();
520 if (hk == NULL) {
521 return NULL;
522 } else {
523 return *hk;
524 }
525 }
526 void set_host_klass(Klass* host) {
527 assert(is_anonymous(), "not anonymous");
528 Klass** addr = (Klass**)adr_host_klass();
529 assert(addr != NULL, "no reversed space");
530 *addr = host;
531 }
532 bool is_anonymous() const {
533 return (_misc_flags & _misc_is_anonymous) != 0;
534 }
535 void set_is_anonymous(bool value) {
536 if (value) {
537 _misc_flags |= _misc_is_anonymous;
538 } else {
539 _misc_flags &= ~_misc_is_anonymous;
540 }
541 }
542
543 // Oop that keeps the metadata for this class from being unloaded
544 // in places where the metadata is stored in other places, like nmethods
545 oop klass_holder() const {
546 return is_anonymous() ? java_mirror() : class_loader();
547 }
548
549 // signers
550 objArrayOop signers() const { return _signers; }
551 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
552
553 // source file name
554 Symbol* source_file_name() const { return _source_file_name; }
555 void set_source_file_name(Symbol* n);
556
557 // minor and major version numbers of class file
558 u2 minor_version() const { return _minor_version; }
559 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
560 u2 major_version() const { return _major_version; }
561 void set_major_version(u2 major_version) { _major_version = major_version; }
562
563 // source debug extension
564 char* source_debug_extension() const { return _source_debug_extension; }
565 void set_source_debug_extension(char* array, int length);
566
567 // symbol unloading support (refcount already added)
568 Symbol* array_name() { return _array_name; }
569 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
570
571 // nonstatic oop-map blocks
572 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
573 return oop_map_count * OopMapBlock::size_in_words();
574 }
575 unsigned int nonstatic_oop_map_count() const {
576 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
577 }
578 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
579 void set_nonstatic_oop_map_size(int words) {
580 _nonstatic_oop_map_size = words;
581 }
582
583 // RedefineClasses() support for previous versions:
584 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
585 int emcp_method_count);
586 // If the _previous_versions array is non-NULL, then this klass
587 // has been redefined at least once even if we aren't currently
588 // tracking a previous version.
589 bool has_been_redefined() const { return _previous_versions != NULL; }
590 bool has_previous_version() const;
591 void init_previous_versions() {
592 _previous_versions = NULL;
593 }
594 GrowableArray<PreviousVersionNode *>* previous_versions() const {
595 return _previous_versions;
596 }
597
598 static void purge_previous_versions(InstanceKlass* ik);
599
600 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
601 void set_cached_class_file(unsigned char *class_file_bytes,
602 jint class_file_len) { _cached_class_file_len = class_file_len;
603 _cached_class_file_bytes = class_file_bytes; }
604 jint get_cached_class_file_len() { return _cached_class_file_len; }
605 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
606
607 // JVMTI: Support for caching of field indices, types, and offsets
608 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
609 _jvmti_cached_class_field_map = descriptor;
610 }
611 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
612 return _jvmti_cached_class_field_map;
613 }
614
615 bool has_default_methods() const {
616 return (_misc_flags & _misc_has_default_methods) != 0;
617 }
618 void set_has_default_methods(bool b) {
619 if (b) {
620 _misc_flags |= _misc_has_default_methods;
621 } else {
622 _misc_flags &= ~_misc_has_default_methods;
623 }
624 }
625
626 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
627 inline u2 next_method_idnum();
628 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
629
630 // generics support
631 Symbol* generic_signature() const { return _generic_signature; }
632 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
633
634 u2 enclosing_method_data(int offset);
635 u2 enclosing_method_class_index() {
636 return enclosing_method_data(enclosing_method_class_index_offset);
637 }
638 u2 enclosing_method_method_index() {
639 return enclosing_method_data(enclosing_method_method_index_offset);
640 }
641 void set_enclosing_method_indices(u2 class_index,
642 u2 method_index);
643
644 // jmethodID support
645 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
646 methodHandle method_h);
647 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
648 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
649 jmethodID* to_dealloc_id_p,
650 jmethodID** to_dealloc_jmeths_p);
651 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
652 size_t *length_p, jmethodID* id_p);
653 jmethodID jmethod_id_or_null(Method* method);
654
655 // cached itable index support
656 void set_cached_itable_index(size_t idnum, int index);
657 int cached_itable_index(size_t idnum);
658
659 // annotations support
660 Annotations* annotations() const { return _annotations; }
661 void set_annotations(Annotations* anno) { _annotations = anno; }
662 AnnotationArray* class_annotations() const {
663 if (annotations() == NULL) return NULL;
664 return annotations()->class_annotations();
665 }
666 Array<AnnotationArray*>* fields_annotations() const {
667 if (annotations() == NULL) return NULL;
668 return annotations()->fields_annotations();
669 }
670
671 // allocation
672 instanceOop allocate_instance(TRAPS);
673
674 // additional member function to return a handle
675 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
676
677 objArrayOop allocate_objArray(int n, int length, TRAPS);
678 // Helper function
679 static instanceOop register_finalizer(instanceOop i, TRAPS);
680
681 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
682 // if not, throw either an Error or an Exception.
683 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
684
685 // initialization
686 void call_class_initializer(TRAPS);
687 void set_initialization_state_and_notify(ClassState state, TRAPS);
688
689 // OopMapCache support
690 OopMapCache* oop_map_cache() { return _oop_map_cache; }
691 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
692 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
693
694 // JNI identifier support (for static fields - for jni performance)
695 JNIid* jni_ids() { return _jni_ids; }
696 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
697 JNIid* jni_id_for(int offset);
698
699 // maintenance of deoptimization dependencies
700 int mark_dependent_nmethods(DepChange& changes);
701 void add_dependent_nmethod(nmethod* nm);
702 void remove_dependent_nmethod(nmethod* nm);
703
704 // On-stack replacement support
705 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
706 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
707 void add_osr_nmethod(nmethod* n);
708 void remove_osr_nmethod(nmethod* n);
709 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
710
711 // Breakpoint support (see methods on Method* for details)
712 BreakpointInfo* breakpoints() const { return _breakpoints; };
713 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
714
715 // support for stub routines
716 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
717 TRACE_DEFINE_OFFSET;
718 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
719
720 // subclass/subinterface checks
721 bool implements_interface(Klass* k) const;
722
723 // Access to the implementor of an interface.
724 Klass* implementor() const
725 {
726 Klass** k = adr_implementor();
727 if (k == NULL) {
728 return NULL;
729 } else {
730 return *k;
731 }
732 }
733
734 void set_implementor(Klass* k) {
735 assert(is_interface(), "not interface");
736 Klass** addr = adr_implementor();
737 *addr = k;
738 }
739
740 int nof_implementors() const {
741 Klass* k = implementor();
742 if (k == NULL) {
743 return 0;
744 } else if (k != this) {
745 return 1;
746 } else {
747 return 2;
748 }
749 }
750
751 void add_implementor(Klass* k); // k is a new class that implements this interface
752 void init_implementor(); // initialize
753
754 // link this class into the implementors list of every interface it implements
755 void process_interfaces(Thread *thread);
756
757 // virtual operations from Klass
758 bool is_leaf_class() const { return _subklass == NULL; }
759 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
760 bool compute_is_subtype_of(Klass* k);
761 bool can_be_primary_super_slow() const;
762 int oop_size(oop obj) const { return size_helper(); }
763 bool oop_is_instance_slow() const { return true; }
764
765 // Iterators
766 void do_local_static_fields(FieldClosure* cl);
767 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
768 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
769
770 void methods_do(void f(Method* method));
771 void array_klasses_do(void f(Klass* k));
772 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
773 void with_array_klasses_do(void f(Klass* k));
774 bool super_types_do(SuperTypeClosure* blk);
775
776 // Casting from Klass*
777 static InstanceKlass* cast(Klass* k) {
778 assert(k->is_klass(), "must be");
779 assert(k->oop_is_instance(), "cast to InstanceKlass");
780 return (InstanceKlass*) k;
781 }
782
783 InstanceKlass* java_super() const {
784 return (super() == NULL) ? NULL : cast(super());
785 }
786
787 // Sizing (in words)
788 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
789 static int size(int vtable_length, int itable_length,
790 int nonstatic_oop_map_size,
791 bool is_interface, bool is_anonymous) {
792 return align_object_size(header_size() +
793 align_object_offset(vtable_length) +
794 align_object_offset(itable_length) +
795 ((is_interface || is_anonymous) ?
796 align_object_offset(nonstatic_oop_map_size) :
797 nonstatic_oop_map_size) +
798 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
799 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
800 }
801 int size() const { return size(vtable_length(),
802 itable_length(),
803 nonstatic_oop_map_size(),
804 is_interface(),
805 is_anonymous());
806 }
807
808 static int vtable_start_offset() { return header_size(); }
809 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
810
811 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
812 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
813 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
814
815 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
816
817 address static_field_addr(int offset);
818
819 OopMapBlock* start_of_nonstatic_oop_maps() const {
820 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
821 }
822
823 Klass** adr_implementor() const {
824 if (is_interface()) {
825 return (Klass**)(start_of_nonstatic_oop_maps() +
826 nonstatic_oop_map_count());
827 } else {
828 return NULL;
829 }
830 };
831
832 Klass** adr_host_klass() const {
833 if (is_anonymous()) {
834 Klass** adr_impl = adr_implementor();
835 if (adr_impl != NULL) {
836 return adr_impl + 1;
837 } else {
838 return (Klass**)(start_of_nonstatic_oop_maps() +
839 nonstatic_oop_map_count());
840 }
841 } else {
842 return NULL;
843 }
844 }
845
846 // Allocation profiling support
847 juint alloc_size() const { return _alloc_count * size_helper(); }
848 void set_alloc_size(juint n) {}
849
850 // Use this to return the size of an instance in heap words:
851 int size_helper() const {
852 return layout_helper_to_size_helper(layout_helper());
853 }
854
855 // This bit is initialized in classFileParser.cpp.
856 // It is false under any of the following conditions:
857 // - the class is abstract (including any interface)
858 // - the class has a finalizer (if !RegisterFinalizersAtInit)
859 // - the class size is larger than FastAllocateSizeLimit
860 // - the class is java/lang/Class, which cannot be allocated directly
861 bool can_be_fastpath_allocated() const {
862 return !layout_helper_needs_slow_path(layout_helper());
863 }
864
865 // Java vtable/itable
866 klassVtable* vtable() const; // return new klassVtable wrapper
867 inline Method* method_at_vtable(int index);
868 klassItable* itable() const; // return new klassItable wrapper
869 Method* method_at_itable(Klass* holder, int index, TRAPS);
870
871 // Garbage collection
872 virtual void oops_do(OopClosure* cl);
873
874 void oop_follow_contents(oop obj);
875 int oop_adjust_pointers(oop obj);
876
877 void clean_implementors_list(BoolObjectClosure* is_alive);
878 void clean_method_data(BoolObjectClosure* is_alive);
879
880 // Explicit metaspace deallocation of fields
881 // For RedefineClasses, we need to deallocate instanceKlasses
882 void deallocate_contents(ClassLoaderData* loader_data);
883
884 // The constant pool is on stack if any of the methods are executing or
885 // referenced by handles.
886 bool on_stack() const { return _constants->on_stack(); }
887
888 void release_C_heap_structures();
889
890 // Parallel Scavenge and Parallel Old
891 PARALLEL_GC_DECLS
892
893 // Naming
894 const char* signature_name() const;
895
896 // Iterators
897 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
898 return oop_oop_iterate_v(obj, blk);
899 }
900
901 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
902 return oop_oop_iterate_v_m(obj, blk, mr);
903 }
904
905 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
906 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
907 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
908 MemRegion mr);
909
910 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
911 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
912
913 #ifndef SERIALGC
914 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
915 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
916
917 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
918 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
919 #endif // !SERIALGC
920
921 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
922 private:
923 // initialization state
924 #ifdef ASSERT
925 void set_init_state(ClassState state);
926 #else
927 void set_init_state(ClassState state) { _init_state = (u1)state; }
928 #endif
929 void set_rewritten() { _misc_flags |= _misc_rewritten; }
930 void set_init_thread(Thread *thread) { _init_thread = thread; }
931
932 // The RedefineClasses() API can cause new method idnums to be needed
933 // which will cause the caches to grow. Safety requires different
934 // cache management logic if the caches can grow instead of just
935 // going from NULL to non-NULL.
936 bool idnum_can_increment() const { return has_been_redefined(); }
937 jmethodID* methods_jmethod_ids_acquire() const
938 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
939 void release_set_methods_jmethod_ids(jmethodID* jmeths)
940 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
941
942 int* methods_cached_itable_indices_acquire() const
943 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
944 void release_set_methods_cached_itable_indices(int* indices)
945 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
946
947 // Lock during initialization
948 volatile oop init_lock() const;
949 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
950 void fence_and_clear_init_lock(); // after fully_initialized
951
952 // Offsets for memory management
953 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
954 oop* adr_signers() const { return (oop*)&this->_signers;}
955 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
956
957 // Static methods that are used to implement member methods where an exposed this pointer
958 // is needed due to possible GCs
959 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
960 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
961 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
962 static void eager_initialize_impl (instanceKlassHandle this_oop);
963 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
964 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
965 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
966 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
967 /* jni_id_for_impl for jfieldID only */
968 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
969
970 // Returns the array class for the n'th dimension
971 Klass* array_klass_impl(bool or_null, int n, TRAPS);
972
973 // Returns the array class with this class as element type
974 Klass* array_klass_impl(bool or_null, TRAPS);
975
976 public:
977 // CDS support - remove and restore oops from metadata. Oops are not shared.
978 virtual void remove_unshareable_info();
979 virtual void restore_unshareable_info(TRAPS);
980
981 // jvm support
982 jint compute_modifier_flags(TRAPS) const;
983
984 public:
985 // JVMTI support
986 jint jvmti_class_status() const;
987
988 public:
989 // Printing
990 #ifndef PRODUCT
991 void print_on(outputStream* st) const;
992 #endif
993 void print_value_on(outputStream* st) const;
994
995 void oop_print_value_on(oop obj, outputStream* st);
996
997 #ifndef PRODUCT
998 void oop_print_on (oop obj, outputStream* st);
999
1000 void print_dependent_nmethods(bool verbose = false);
1001 bool is_dependent_nmethod(nmethod* nm);
1002 #endif
1003
1004 const char* internal_name() const;
1005
1006 // Verification
1007 void verify_on(outputStream* st);
1008
1009 void oop_verify_on(oop obj, outputStream* st);
1010 };
1011
1012 inline Method* InstanceKlass::method_at_vtable(int index) {
1013 #ifndef PRODUCT
1014 assert(index >= 0, "valid vtable index");
1015 if (DebugVtables) {
1016 verify_vtable_index(index);
1017 }
1018 #endif
1019 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1020 return ve[index].method();
1021 }
1022
1023 // for adding methods
1024 // UNSET_IDNUM return means no more ids available
1025 inline u2 InstanceKlass::next_method_idnum() {
1026 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1027 return ConstMethod::UNSET_IDNUM; // no more ids available
1028 } else {
1029 return _idnum_allocated_count++;
1030 }
1031 }
1032
1033
1034 /* JNIid class for jfieldIDs only */
1035 class JNIid: public CHeapObj<mtClass> {
1036 friend class VMStructs;
1037 private:
1038 Klass* _holder;
1039 JNIid* _next;
1040 int _offset;
1041 #ifdef ASSERT
1042 bool _is_static_field_id;
1043 #endif
1044
1045 public:
1046 // Accessors
1047 Klass* holder() const { return _holder; }
1048 int offset() const { return _offset; }
1049 JNIid* next() { return _next; }
1050 // Constructor
1051 JNIid(Klass* holder, int offset, JNIid* next);
1052 // Identifier lookup
1053 JNIid* find(int offset);
1054
1055 bool find_local_field(fieldDescriptor* fd) {
1056 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1057 }
1058
1059 static void deallocate(JNIid* id);
1060 // Debugging
1061 #ifdef ASSERT
1062 bool is_static_field_id() const { return _is_static_field_id; }
1063 void set_is_static_field_id() { _is_static_field_id = true; }
1064 #endif
1065 void verify(Klass* holder);
1066 };
1067
1068
1069 // If breakpoints are more numerous than just JVMTI breakpoints,
1070 // consider compressing this data structure.
1071 // It is currently a simple linked list defined in method.hpp.
1072
1073 class BreakpointInfo;
1074
1075
1076 // A collection point for interesting information about the previous
1077 // version(s) of an InstanceKlass. This class uses weak references to
1078 // the information so that the information may be collected as needed
1079 // by the system. If the information is shared, then a regular
1080 // reference must be used because a weak reference would be seen as
1081 // collectible. A GrowableArray of PreviousVersionNodes is attached
1082 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1083 class PreviousVersionNode : public CHeapObj<mtClass> {
1084 private:
1085 // A shared ConstantPool is never collected so we'll always have
1086 // a reference to it so we can update items in the cache. We'll
1087 // have a weak reference to a non-shared ConstantPool until all
1088 // of the methods (EMCP or obsolete) have been collected; the
1089 // non-shared ConstantPool becomes collectible at that point.
1090 ConstantPool* _prev_constant_pool; // regular or weak reference
1091 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1092
1093 // If the previous version of the InstanceKlass doesn't have any
1094 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1095 // EMCP methods have been collected, then _prev_EMCP_methods can
1096 // have a length of zero.
1097 GrowableArray<Method*>* _prev_EMCP_methods;
1098
1099 public:
1100 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1101 GrowableArray<Method*>* prev_EMCP_methods);
1102 ~PreviousVersionNode();
1103 ConstantPool* prev_constant_pool() const {
1104 return _prev_constant_pool;
1105 }
1106 GrowableArray<Method*>* prev_EMCP_methods() const {
1107 return _prev_EMCP_methods;
1108 }
1109 };
1110
1111
1112 // A Handle-ized version of PreviousVersionNode.
1113 class PreviousVersionInfo : public ResourceObj {
1114 private:
1115 constantPoolHandle _prev_constant_pool_handle;
1116 // If the previous version of the InstanceKlass doesn't have any
1117 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1118 // methods cannot be collected while we hold a handle,
1119 // _prev_EMCP_methods should never have a length of zero.
1120 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1121
1122 public:
1123 PreviousVersionInfo(PreviousVersionNode *pv_node);
1124 ~PreviousVersionInfo();
1125 constantPoolHandle prev_constant_pool_handle() const {
1126 return _prev_constant_pool_handle;
1127 }
1128 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1129 return _prev_EMCP_method_handles;
1130 }
1131 };
1132
1133
1134 // Helper object for walking previous versions. This helper cleans up
1135 // the Handles that it allocates when the helper object is destroyed.
1136 // The PreviousVersionInfo object returned by next_previous_version()
1137 // is only valid until a subsequent call to next_previous_version() or
1138 // the helper object is destroyed.
1139 class PreviousVersionWalker : public StackObj {
1140 private:
1141 GrowableArray<PreviousVersionNode *>* _previous_versions;
1142 int _current_index;
1143 // Fields for cleaning up when we are done walking the previous versions:
1144 // A HandleMark for the PreviousVersionInfo handles:
1145 HandleMark _hm;
1146
1147 // It would be nice to have a ResourceMark field in this helper also,
1148 // but the ResourceMark code says to be careful to delete handles held
1149 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1150 // can't guarantee the order in which the fields are destroyed, we
1151 // have to let the creator of the PreviousVersionWalker object do
1152 // the right thing. Also, adding a ResourceMark here causes an
1153 // include loop.
1154
1155 // A pointer to the current info object so we can handle the deletes.
1156 PreviousVersionInfo * _current_p;
1157
1158 public:
1159 PreviousVersionWalker(InstanceKlass *ik);
1160 ~PreviousVersionWalker();
1161
1162 // Return the interesting information for the next previous version
1163 // of the klass. Returns NULL if there are no more previous versions.
1164 PreviousVersionInfo* next_previous_version();
1165 };
1166
1167
1168 //
1169 // nmethodBucket is used to record dependent nmethods for
1170 // deoptimization. nmethod dependencies are actually <klass, method>
1171 // pairs but we really only care about the klass part for purposes of
1172 // finding nmethods which might need to be deoptimized. Instead of
1173 // recording the method, a count of how many times a particular nmethod
1174 // was recorded is kept. This ensures that any recording errors are
1175 // noticed since an nmethod should be removed as many times are it's
1176 // added.
1177 //
1178 class nmethodBucket: public CHeapObj<mtClass> {
1179 friend class VMStructs;
1180 private:
1181 nmethod* _nmethod;
1182 int _count;
1183 nmethodBucket* _next;
1184
1185 public:
1186 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1187 _nmethod = nmethod;
1188 _next = next;
1189 _count = 1;
1190 }
1191 int count() { return _count; }
1192 int increment() { _count += 1; return _count; }
1193 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1194 nmethodBucket* next() { return _next; }
1195 void set_next(nmethodBucket* b) { _next = b; }
1196 nmethod* get_nmethod() { return _nmethod; }
1197 };
1198
1199 // An iterator that's used to access the inner classes indices in the
1200 // InstanceKlass::_inner_classes array.
1201 class InnerClassesIterator : public StackObj {
1202 private:
1203 Array<jushort>* _inner_classes;
1204 int _length;
1205 int _idx;
1206 public:
1207
1208 InnerClassesIterator(instanceKlassHandle k) {
1209 _inner_classes = k->inner_classes();
1210 if (k->inner_classes() != NULL) {
1211 _length = _inner_classes->length();
1212 // The inner class array's length should be the multiple of
1213 // inner_class_next_offset if it only contains the InnerClasses
1214 // attribute data, or it should be
1215 // n*inner_class_next_offset+enclosing_method_attribute_size
1216 // if it also contains the EnclosingMethod data.
1217 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1218 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1219 "just checking");
1220 // Remove the enclosing_method portion if exists.
1221 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1222 _length -= InstanceKlass::enclosing_method_attribute_size;
1223 }
1224 } else {
1225 _length = 0;
1226 }
1227 _idx = 0;
1228 }
1229
1230 int length() const {
1231 return _length;
1232 }
1233
1234 void next() {
1235 _idx += InstanceKlass::inner_class_next_offset;
1236 }
1237
1238 bool done() const {
1239 return (_idx >= _length);
1240 }
1241
1242 u2 inner_class_info_index() const {
1243 return _inner_classes->at(
1244 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1245 }
1246
1247 void set_inner_class_info_index(u2 index) {
1248 _inner_classes->at_put(
1249 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1250 }
1251
1252 u2 outer_class_info_index() const {
1253 return _inner_classes->at(
1254 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1255 }
1256
1257 void set_outer_class_info_index(u2 index) {
1258 _inner_classes->at_put(
1259 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1260 }
1261
1262 u2 inner_name_index() const {
1263 return _inner_classes->at(
1264 _idx + InstanceKlass::inner_class_inner_name_offset);
1265 }
1266
1267 void set_inner_name_index(u2 index) {
1268 _inner_classes->at_put(
1269 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1270 }
1271
1272 u2 inner_access_flags() const {
1273 return _inner_classes->at(
1274 _idx + InstanceKlass::inner_class_access_flags_offset);
1275 }
1276 };
1277
1278 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP