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