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