1 /*
2 * Copyright (c) 1997, 2017, 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/atomic.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/bitMap.inline.hpp"
40 #include "utilities/macros.hpp"
41 #include "trace/traceMacros.hpp"
42
43 // An InstanceKlass is the VM level representation of a Java class.
44 // It contains all information needed for at class at execution runtime.
45
46 // InstanceKlass layout:
47 // [C++ vtbl pointer ] Klass
48 // [subtype cache ] Klass
49 // [instance size ] Klass
50 // [java mirror ] Klass
51 // [super ] Klass
52 // [access_flags ] Klass
53 // [name ] Klass
54 // [first subklass ] Klass
55 // [next sibling ] Klass
56 // [array klasses ]
57 // [methods ]
58 // [local interfaces ]
59 // [transitive interfaces ]
60 // [fields ]
61 // [constants ]
62 // [class loader ]
63 // [source file name ]
64 // [inner classes ]
65 // [static field size ]
66 // [nonstatic field size ]
67 // [static oop fields size ]
68 // [nonstatic oop maps size ]
69 // [has finalize method ]
70 // [deoptimization mark bit ]
71 // [initialization state ]
72 // [initializing thread ]
73 // [Java vtable length ]
74 // [oop map cache (stack maps) ]
75 // [EMBEDDED Java vtable ] size in words = vtable_len
76 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
77 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
78 // indicating where oops are located in instances of this klass.
79 // [EMBEDDED implementor of the interface] only exist for interface
80 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
81
82
83 // forward declaration for class -- see below for definition
84 class SuperTypeClosure;
85 class JNIid;
86 class jniIdMapBase;
87 class BreakpointInfo;
88 class fieldDescriptor;
89 class DepChange;
90 class nmethodBucket;
91 class JvmtiCachedClassFieldMap;
92 class MemberNameTable;
93
94 // This is used in iterators below.
95 class FieldClosure: public StackObj {
96 public:
97 virtual void do_field(fieldDescriptor* fd) = 0;
98 };
99
100 #ifndef PRODUCT
101 // Print fields.
102 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
103 class FieldPrinter: public FieldClosure {
104 oop _obj;
105 outputStream* _st;
106 public:
107 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
108 void do_field(fieldDescriptor* fd);
109 };
110 #endif // !PRODUCT
111
112 // ValueObjs embedded in klass. Describes where oops are located in instances of
113 // this klass.
114 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
115 public:
116 // Byte offset of the first oop mapped by this block.
117 int offset() const { return _offset; }
118 void set_offset(int offset) { _offset = offset; }
119
120 // Number of oops in this block.
121 uint count() const { return _count; }
122 void set_count(uint count) { _count = count; }
123
124 // sizeof(OopMapBlock) in HeapWords.
125 static const int size_in_words() {
126 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
127 LogHeapWordSize;
128 }
129
130 private:
131 int _offset;
132 uint _count;
133 };
134
135 struct JvmtiCachedClassFileData;
136
137 class InstanceKlass: public Klass {
138 friend class VMStructs;
139 friend class ClassFileParser;
140 friend class CompileReplay;
141
142 protected:
143 // Constructor
144 InstanceKlass(int vtable_len,
145 int itable_len,
146 int static_field_size,
147 int nonstatic_oop_map_size,
148 ReferenceType rt,
149 AccessFlags access_flags,
150 bool is_anonymous);
151 public:
152 static InstanceKlass* allocate_instance_klass(
153 ClassLoaderData* loader_data,
154 int vtable_len,
155 int itable_len,
156 int static_field_size,
157 int nonstatic_oop_map_size,
158 ReferenceType rt,
159 AccessFlags access_flags,
160 Symbol* name,
161 Klass* super_klass,
162 bool is_anonymous,
163 TRAPS);
164
165 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
166
167 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
168 // of the class loading & initialization procedure, and the use of the states.
169 enum ClassState {
170 allocated, // allocated (but not yet linked)
171 loaded, // loaded and inserted in class hierarchy (but not linked yet)
172 linked, // successfully linked/verified (but not initialized yet)
173 being_initialized, // currently running class initializer
174 fully_initialized, // initialized (successfull final state)
175 initialization_error // error happened during initialization
176 };
177
178 static int number_of_instance_classes() { return _total_instanceKlass_count; }
179
180 private:
181 static volatile int _total_instanceKlass_count;
182
183 protected:
184 // Annotations for this class
185 Annotations* _annotations;
186 // Array classes holding elements of this class.
187 Klass* _array_klasses;
188 // Constant pool for this class.
189 ConstantPool* _constants;
190 // The InnerClasses attribute and EnclosingMethod attribute. The
191 // _inner_classes is an array of shorts. If the class has InnerClasses
192 // attribute, then the _inner_classes array begins with 4-tuples of shorts
193 // [inner_class_info_index, outer_class_info_index,
194 // inner_name_index, inner_class_access_flags] for the InnerClasses
195 // attribute. If the EnclosingMethod attribute exists, it occupies the
196 // last two shorts [class_index, method_index] of the array. If only
197 // the InnerClasses attribute exists, the _inner_classes array length is
198 // number_of_inner_classes * 4. If the class has both InnerClasses
199 // and EnclosingMethod attributes the _inner_classes array length is
200 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
201 Array<jushort>* _inner_classes;
202
203 // the source debug extension for this klass, NULL if not specified.
204 // Specified as UTF-8 string without terminating zero byte in the classfile,
205 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
206 char* _source_debug_extension;
207 // Array name derived from this class which needs unreferencing
208 // if this class is unloaded.
209 Symbol* _array_name;
210
211 // Number of heapOopSize words used by non-static fields in this klass
212 // (including inherited fields but after header_size()).
213 int _nonstatic_field_size;
214 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
215 // Constant pool index to the utf8 entry of the Generic signature,
216 // or 0 if none.
217 u2 _generic_signature_index;
218 // Constant pool index to the utf8 entry for the name of source file
219 // containing this klass, 0 if not specified.
220 u2 _source_file_name_index;
221 u2 _static_oop_field_count;// number of static oop fields in this klass
222 u2 _java_fields_count; // The number of declared Java fields
223 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
224
225 // _is_marked_dependent can be set concurrently, thus cannot be part of the
226 // _misc_flags.
227 bool _is_marked_dependent; // used for marking during flushing and deoptimization
228 bool _has_unloaded_dependent;
229
230 enum {
231 _misc_rewritten = 1 << 0, // methods rewritten.
232 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
233 _misc_should_verify_class = 1 << 2, // allow caching of preverification
234 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
235 _misc_is_contended = 1 << 4, // marked with contended annotation
236 _misc_has_default_methods = 1 << 5, // class/superclass/implemented interfaces has default methods
237 _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access)
238 _misc_has_been_redefined = 1 << 7 // class has been redefined
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 MemberNameTable* _member_names; // Member names
248 JNIid* _jni_ids; // First JNI identifier for static fields in this class
249 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
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 // Linked instanceKlasses of previous versions
254 InstanceKlass* _previous_versions;
255 // JVMTI fields can be moved to their own structure - see 6315920
256 // JVMTI: cached class file, before retransformable agent modified it in CFLH
257 JvmtiCachedClassFileData* _cached_class_file;
258
259 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
260
261 // Class states are defined as ClassState (see above).
262 // Place the _init_state here to utilize the unused 2-byte after
263 // _idnum_allocated_count.
264 u1 _init_state; // state of class
265 u1 _reference_type; // reference type
266
267 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
268
269 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
270
271 // Method array.
272 Array<Method*>* _methods;
273 // Default Method Array, concrete methods inherited from interfaces
274 Array<Method*>* _default_methods;
275 // Interface (Klass*s) this class declares locally to implement.
276 Array<Klass*>* _local_interfaces;
277 // Interface (Klass*s) this class implements transitively.
278 Array<Klass*>* _transitive_interfaces;
279 // Int array containing the original order of method in the class file (for JVMTI).
280 Array<int>* _method_ordering;
281 // Int array containing the vtable_indices for default_methods
282 // offset matches _default_methods offset
283 Array<int>* _default_vtable_indices;
284
285 // Instance and static variable information, starts with 6-tuples of shorts
286 // [access, name index, sig index, initval index, low_offset, high_offset]
287 // for all fields, followed by the generic signature data at the end of
288 // the array. Only fields with generic signature attributes have the generic
289 // signature data set in the array. The fields array looks like following:
290 //
291 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
292 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
293 // ...
294 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
295 // [generic signature index]
296 // [generic signature index]
297 // ...
298 Array<u2>* _fields;
299
300 // embedded Java vtable follows here
301 // embedded Java itables follows here
302 // embedded static fields follows here
303 // embedded nonstatic oop-map blocks follows here
304 // embedded implementor of this interface follows here
305 // The embedded implementor only exists if the current klass is an
306 // iterface. The possible values of the implementor fall into following
307 // three cases:
308 // NULL: no implementor.
309 // A Klass* that's not itself: one implementor.
310 // Itself: more than one implementors.
311 // embedded host klass follows here
312 // The embedded host klass only exists in an anonymous class for
313 // dynamic language support (JSR 292 enabled). The host class grants
314 // its access privileges to this class also. The host class is either
315 // named, or a previously loaded anonymous class. A non-anonymous class
316 // or an anonymous class loaded through normal classloading does not
317 // have this embedded field.
318 //
319
320 friend class SystemDictionary;
321
322 public:
323 bool has_nonstatic_fields() const {
324 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
325 }
326 void set_has_nonstatic_fields(bool b) {
327 if (b) {
328 _misc_flags |= _misc_has_nonstatic_fields;
329 } else {
330 _misc_flags &= ~_misc_has_nonstatic_fields;
331 }
332 }
333
334 // field sizes
335 int nonstatic_field_size() const { return _nonstatic_field_size; }
336 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
337
338 int static_field_size() const { return _static_field_size; }
339 void set_static_field_size(int size) { _static_field_size = size; }
340
341 int static_oop_field_count() const { return (int)_static_oop_field_count; }
342 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
343
344 // Java vtable
345 int vtable_length() const { return _vtable_len; }
346 void set_vtable_length(int len) { _vtable_len = len; }
347
348 // Java itable
349 int itable_length() const { return _itable_len; }
350 void set_itable_length(int len) { _itable_len = len; }
351
352 // array klasses
353 Klass* array_klasses() const { return _array_klasses; }
354 void set_array_klasses(Klass* k) { _array_klasses = k; }
355
356 // methods
357 Array<Method*>* methods() const { return _methods; }
358 void set_methods(Array<Method*>* a) { _methods = a; }
359 Method* method_with_idnum(int idnum);
360 Method* method_with_orig_idnum(int idnum);
361 Method* method_with_orig_idnum(int idnum, int version);
362
363 // method ordering
364 Array<int>* method_ordering() const { return _method_ordering; }
365 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
366 void copy_method_ordering(intArray* m, TRAPS);
367
368 // default_methods
369 Array<Method*>* default_methods() const { return _default_methods; }
370 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
371
372 // default method vtable_indices
373 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
374 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
375 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
376
377 // interfaces
378 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
379 void set_local_interfaces(Array<Klass*>* a) {
380 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
381 _local_interfaces = a; }
382
383 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
384 void set_transitive_interfaces(Array<Klass*>* a) {
385 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
386 _transitive_interfaces = a;
387 }
388
389 private:
390 friend class fieldDescriptor;
391 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
392
393 public:
394 int field_offset (int index) const { return field(index)->offset(); }
395 int field_access_flags(int index) const { return field(index)->access_flags(); }
396 Symbol* field_name (int index) const { return field(index)->name(constants()); }
397 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
398
399 // Number of Java declared fields
400 int java_fields_count() const { return (int)_java_fields_count; }
401
402 Array<u2>* fields() const { return _fields; }
403 void set_fields(Array<u2>* f, u2 java_fields_count) {
404 guarantee(_fields == NULL || f == NULL, "Just checking");
405 _fields = f;
406 _java_fields_count = java_fields_count;
407 }
408
409 // inner classes
410 Array<u2>* inner_classes() const { return _inner_classes; }
411 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
412
413 enum InnerClassAttributeOffset {
414 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
415 inner_class_inner_class_info_offset = 0,
416 inner_class_outer_class_info_offset = 1,
417 inner_class_inner_name_offset = 2,
418 inner_class_access_flags_offset = 3,
419 inner_class_next_offset = 4
420 };
421
422 enum EnclosingMethodAttributeOffset {
423 enclosing_method_class_index_offset = 0,
424 enclosing_method_method_index_offset = 1,
425 enclosing_method_attribute_size = 2
426 };
427
428 // method override check
429 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
430
431 // package
432 bool is_same_class_package(Klass* class2);
433 bool is_same_class_package(oop classloader2, Symbol* classname2);
434 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
435
436 // find an enclosing class (defined where original code was, in jvm.cpp!)
437 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
438 instanceKlassHandle self(THREAD, this);
439 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
440 }
441 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
442 bool* inner_is_member, TRAPS);
443
444 // tell if two classes have the same enclosing class (at package level)
445 bool is_same_package_member(Klass* class2, TRAPS) {
446 instanceKlassHandle self(THREAD, this);
447 return is_same_package_member_impl(self, class2, THREAD);
448 }
449 static bool is_same_package_member_impl(instanceKlassHandle self,
450 Klass* class2, TRAPS);
451
452 // initialization state
453 bool is_loaded() const { return _init_state >= loaded; }
454 bool is_linked() const { return _init_state >= linked; }
455 bool is_initialized() const { return _init_state == fully_initialized; }
456 bool is_not_initialized() const { return _init_state < being_initialized; }
457 bool is_being_initialized() const { return _init_state == being_initialized; }
458 bool is_in_error_state() const { return _init_state == initialization_error; }
459 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
460 ClassState init_state() { return (ClassState)_init_state; }
461 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
462
463 // defineClass specified verification
464 bool should_verify_class() const {
465 return (_misc_flags & _misc_should_verify_class) != 0;
466 }
467 void set_should_verify_class(bool value) {
468 if (value) {
469 _misc_flags |= _misc_should_verify_class;
470 } else {
471 _misc_flags &= ~_misc_should_verify_class;
472 }
473 }
474
475 // marking
476 bool is_marked_dependent() const { return _is_marked_dependent; }
477 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
478
479 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
480 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
481
482 // initialization (virtuals from Klass)
483 bool should_be_initialized() const; // means that initialize should be called
484 void initialize(TRAPS);
485 void link_class(TRAPS);
486 bool link_class_or_fail(TRAPS); // returns false on failure
487 void unlink_class();
488 void rewrite_class(TRAPS);
489 void link_methods(TRAPS);
490 Method* class_initializer();
491
492 // set the class to initialized if no static initializer is present
493 void eager_initialize(Thread *thread);
494
495 // reference type
496 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
497 void set_reference_type(ReferenceType t) {
498 assert(t == (u1)t, "overflow");
499 _reference_type = (u1)t;
500 }
501
502 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
503
504 // find local field, returns true if found
505 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
506 // find field in direct superinterfaces, returns the interface in which the field is defined
507 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
508 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
509 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
510 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
511 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
512
513 // find a non-static or static field given its offset within the class.
514 bool contains_field_offset(int offset) {
515 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
516 }
517
518 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
519 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
520
521 // find a local method (returns NULL if not found)
522 Method* find_method(Symbol* name, Symbol* signature) const;
523 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
524
525 // find a local method, but skip static methods
526 Method* find_instance_method(Symbol* name, Symbol* signature);
527 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
528
529 // find a local method (returns NULL if not found)
530 Method* find_local_method(Symbol* name, Symbol* signature,
531 OverpassLookupMode overpass_mode,
532 StaticLookupMode static_mode,
533 PrivateLookupMode private_mode) const;
534
535 // find a local method from given methods array (returns NULL if not found)
536 static Method* find_local_method(Array<Method*>* methods,
537 Symbol* name, Symbol* signature,
538 OverpassLookupMode overpass_mode,
539 StaticLookupMode static_mode,
540 PrivateLookupMode private_mode);
541
542 // true if method matches signature and conforms to skipping_X conditions.
543 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
544
545 // find a local method index in methods or default_methods (returns -1 if not found)
546 static int find_method_index(Array<Method*>* methods,
547 Symbol* name, Symbol* signature,
548 OverpassLookupMode overpass_mode,
549 StaticLookupMode static_mode,
550 PrivateLookupMode private_mode);
551
552
553 // lookup operation (returns NULL if not found)
554 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
555
556 // lookup a method in all the interfaces that this class implements
557 // (returns NULL if not found)
558 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
559
560 // lookup a method in local defaults then in all interfaces
561 // (returns NULL if not found)
562 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
563
564 // Find method indices by name. If a method with the specified name is
565 // found the index to the first method is returned, and 'end' is filled in
566 // with the index of first non-name-matching method. If no method is found
567 // -1 is returned.
568 int find_method_by_name(Symbol* name, int* end);
569 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
570
571 // constant pool
572 ConstantPool* constants() const { return _constants; }
573 void set_constants(ConstantPool* c) { _constants = c; }
574
575 // protection domain
576 oop protection_domain() const;
577
578 // signers
579 objArrayOop signers() const;
580
581 // host class
582 Klass* host_klass() const {
583 Klass** hk = (Klass**)adr_host_klass();
584 if (hk == NULL) {
585 return NULL;
586 } else {
587 assert(*hk != NULL, "host klass should always be set if the address is not null");
588 return *hk;
589 }
590 }
591 void set_host_klass(Klass* host) {
592 assert(is_anonymous(), "not anonymous");
593 Klass** addr = (Klass**)adr_host_klass();
594 assert(addr != NULL, "no reversed space");
595 if (addr != NULL) {
596 *addr = host;
597 }
598 }
599 bool is_anonymous() const {
600 return (_misc_flags & _misc_is_anonymous) != 0;
601 }
602 void set_is_anonymous(bool value) {
603 if (value) {
604 _misc_flags |= _misc_is_anonymous;
605 } else {
606 _misc_flags &= ~_misc_is_anonymous;
607 }
608 }
609
610 // Oop that keeps the metadata for this class from being unloaded
611 // in places where the metadata is stored in other places, like nmethods
612 oop klass_holder() const {
613 return is_anonymous() ? java_mirror() : class_loader();
614 }
615
616 bool is_contended() const {
617 return (_misc_flags & _misc_is_contended) != 0;
618 }
619 void set_is_contended(bool value) {
620 if (value) {
621 _misc_flags |= _misc_is_contended;
622 } else {
623 _misc_flags &= ~_misc_is_contended;
624 }
625 }
626
627 // source file name
628 Symbol* source_file_name() const {
629 return (_source_file_name_index == 0) ?
630 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
631 }
632 u2 source_file_name_index() const {
633 return _source_file_name_index;
634 }
635 void set_source_file_name_index(u2 sourcefile_index) {
636 _source_file_name_index = sourcefile_index;
637 }
638
639 // minor and major version numbers of class file
640 u2 minor_version() const { return _minor_version; }
641 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
642 u2 major_version() const { return _major_version; }
643 void set_major_version(u2 major_version) { _major_version = major_version; }
644
645 // source debug extension
646 char* source_debug_extension() const { return _source_debug_extension; }
647 void set_source_debug_extension(char* array, int length);
648
649 // symbol unloading support (refcount already added)
650 Symbol* array_name() { return _array_name; }
651 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
652
653 // nonstatic oop-map blocks
654 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
655 return oop_map_count * OopMapBlock::size_in_words();
656 }
657 unsigned int nonstatic_oop_map_count() const {
658 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
659 }
660 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
661 void set_nonstatic_oop_map_size(int words) {
662 _nonstatic_oop_map_size = words;
663 }
664
665 // RedefineClasses() support for previous versions:
666 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
667
668 InstanceKlass* previous_versions() const { return _previous_versions; }
669
670 bool has_been_redefined() const {
671 return (_misc_flags & _misc_has_been_redefined) != 0;
672 }
673 void set_has_been_redefined() {
674 _misc_flags |= _misc_has_been_redefined;
675 }
676
677 void init_previous_versions() {
678 _previous_versions = NULL;
679 }
680
681
682 InstanceKlass* get_klass_version(int version) {
683 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
684 if (ik->constants()->version() == version) {
685 return ik;
686 }
687 }
688 return NULL;
689 }
690
691 static void purge_previous_versions(InstanceKlass* ik);
692
693 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
694 void set_cached_class_file(JvmtiCachedClassFileData *data) {
695 _cached_class_file = data;
696 }
697 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
698 jint get_cached_class_file_len();
699 unsigned char * get_cached_class_file_bytes();
700
701 // JVMTI: Support for caching of field indices, types, and offsets
702 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
703 _jvmti_cached_class_field_map = descriptor;
704 }
705 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
706 return _jvmti_cached_class_field_map;
707 }
708
709 bool has_default_methods() const {
710 return (_misc_flags & _misc_has_default_methods) != 0;
711 }
712 void set_has_default_methods(bool b) {
713 if (b) {
714 _misc_flags |= _misc_has_default_methods;
715 } else {
716 _misc_flags &= ~_misc_has_default_methods;
717 }
718 }
719
720 bool declares_default_methods() const {
721 return (_misc_flags & _misc_declares_default_methods) != 0;
722 }
723 void set_declares_default_methods(bool b) {
724 if (b) {
725 _misc_flags |= _misc_declares_default_methods;
726 } else {
727 _misc_flags &= ~_misc_declares_default_methods;
728 }
729 }
730
731 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
732 inline u2 next_method_idnum();
733 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
734
735 // generics support
736 Symbol* generic_signature() const {
737 return (_generic_signature_index == 0) ?
738 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
739 }
740 u2 generic_signature_index() const {
741 return _generic_signature_index;
742 }
743 void set_generic_signature_index(u2 sig_index) {
744 _generic_signature_index = sig_index;
745 }
746
747 u2 enclosing_method_data(int offset);
748 u2 enclosing_method_class_index() {
749 return enclosing_method_data(enclosing_method_class_index_offset);
750 }
751 u2 enclosing_method_method_index() {
752 return enclosing_method_data(enclosing_method_method_index_offset);
753 }
754 void set_enclosing_method_indices(u2 class_index,
755 u2 method_index);
756
757 // jmethodID support
758 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
759 methodHandle method_h);
760 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
761 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
762 jmethodID* to_dealloc_id_p,
763 jmethodID** to_dealloc_jmeths_p);
764 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
765 size_t *length_p, jmethodID* id_p);
766 jmethodID jmethod_id_or_null(Method* method);
767
768 // annotations support
769 Annotations* annotations() const { return _annotations; }
770 void set_annotations(Annotations* anno) { _annotations = anno; }
771
772 AnnotationArray* class_annotations() const {
773 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
774 }
775 Array<AnnotationArray*>* fields_annotations() const {
776 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
777 }
778 AnnotationArray* class_type_annotations() const {
779 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
780 }
781 Array<AnnotationArray*>* fields_type_annotations() const {
782 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
783 }
784 // allocation
785 instanceOop allocate_instance(TRAPS);
786
787 // additional member function to return a handle
788 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
789
790 objArrayOop allocate_objArray(int n, int length, TRAPS);
791 // Helper function
792 static instanceOop register_finalizer(instanceOop i, TRAPS);
793
794 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
795 // if not, throw either an Error or an Exception.
796 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
797
798 // initialization
799 void call_class_initializer(TRAPS);
800 void set_initialization_state_and_notify(ClassState state, TRAPS);
801
802 // OopMapCache support
803 OopMapCache* oop_map_cache() { return _oop_map_cache; }
804 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
805 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
806
807 // JNI identifier support (for static fields - for jni performance)
808 JNIid* jni_ids() { return _jni_ids; }
809 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
810 JNIid* jni_id_for(int offset);
811
812 // maintenance of deoptimization dependencies
813 int mark_dependent_nmethods(DepChange& changes);
814 void add_dependent_nmethod(nmethod* nm);
815 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
816
817 // On-stack replacement support
818 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
819 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
820 void add_osr_nmethod(nmethod* n);
821 void remove_osr_nmethod(nmethod* n);
822 int mark_osr_nmethods(const Method* m);
823 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
824
825 // Breakpoint support (see methods on Method* for details)
826 BreakpointInfo* breakpoints() const { return _breakpoints; };
827 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
828
829 // support for stub routines
830 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
831 TRACE_DEFINE_OFFSET;
832 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
833
834 // subclass/subinterface checks
835 bool implements_interface(Klass* k) const;
836 bool is_same_or_direct_interface(Klass* k) const;
837
838 #ifdef ASSERT
839 // check whether this class or one of its superclasses was redefined
840 bool has_redefined_this_or_super() const;
841 #endif
842
843 // Access to the implementor of an interface.
844 Klass* implementor() const
845 {
846 Klass** k = adr_implementor();
847 if (k == NULL) {
848 return NULL;
849 } else {
850 return *k;
851 }
852 }
853
854 void set_implementor(Klass* k) {
855 assert(is_interface(), "not interface");
856 Klass** addr = adr_implementor();
857 assert(addr != NULL, "null addr");
858 if (addr != NULL) {
859 *addr = k;
860 }
861 }
862
863 int nof_implementors() const {
864 Klass* k = implementor();
865 if (k == NULL) {
866 return 0;
867 } else if (k != this) {
868 return 1;
869 } else {
870 return 2;
871 }
872 }
873
874 void add_implementor(Klass* k); // k is a new class that implements this interface
875 void init_implementor(); // initialize
876
877 // link this class into the implementors list of every interface it implements
878 void process_interfaces(Thread *thread);
879
880 // virtual operations from Klass
881 bool is_leaf_class() const { return _subklass == NULL; }
882 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
883 bool compute_is_subtype_of(Klass* k);
884 bool can_be_primary_super_slow() const;
885 int oop_size(oop obj) const { return size_helper(); }
886 bool oop_is_instance_slow() const { return true; }
887
888 // Iterators
889 void do_local_static_fields(FieldClosure* cl);
890 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
891 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
892
893 void methods_do(void f(Method* method));
894 void array_klasses_do(void f(Klass* k));
895 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
896 bool super_types_do(SuperTypeClosure* blk);
897
898 // Casting from Klass*
899 static InstanceKlass* cast(Klass* k) {
900 assert(k == NULL || k->is_klass(), "must be");
901 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
902 return (InstanceKlass*) k;
903 }
904
905 InstanceKlass* java_super() const {
906 return (super() == NULL) ? NULL : cast(super());
907 }
908
909 // Sizing (in words)
910 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
911
912 static int size(int vtable_length, int itable_length,
913 int nonstatic_oop_map_size,
914 bool is_interface, bool is_anonymous) {
915 return align_object_size(header_size() +
916 align_object_offset(vtable_length) +
917 align_object_offset(itable_length) +
918 ((is_interface || is_anonymous) ?
919 align_object_offset(nonstatic_oop_map_size) :
920 nonstatic_oop_map_size) +
921 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
922 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
923 }
924 int size() const { return size(vtable_length(),
925 itable_length(),
926 nonstatic_oop_map_size(),
927 is_interface(),
928 is_anonymous());
929 }
930 #if INCLUDE_SERVICES
931 virtual void collect_statistics(KlassSizeStats *sz) const;
932 #endif
933
934 static int vtable_start_offset() { return header_size(); }
935 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
936
937 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
938 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
939 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
940
941 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
942
943 address static_field_addr(int offset);
944
945 OopMapBlock* start_of_nonstatic_oop_maps() const {
946 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
947 }
948
949 Klass** end_of_nonstatic_oop_maps() const {
950 return (Klass**)(start_of_nonstatic_oop_maps() +
951 nonstatic_oop_map_count());
952 }
953
954 Klass** adr_implementor() const {
955 if (is_interface()) {
956 return (Klass**)end_of_nonstatic_oop_maps();
957 } else {
958 return NULL;
959 }
960 };
961
962 Klass** adr_host_klass() const {
963 if (is_anonymous()) {
964 Klass** adr_impl = adr_implementor();
965 if (adr_impl != NULL) {
966 return adr_impl + 1;
967 } else {
968 return end_of_nonstatic_oop_maps();
969 }
970 } else {
971 return NULL;
972 }
973 }
974
975 // Use this to return the size of an instance in heap words:
976 int size_helper() const {
977 return layout_helper_to_size_helper(layout_helper());
978 }
979
980 // This bit is initialized in classFileParser.cpp.
981 // It is false under any of the following conditions:
982 // - the class is abstract (including any interface)
983 // - the class has a finalizer (if !RegisterFinalizersAtInit)
984 // - the class size is larger than FastAllocateSizeLimit
985 // - the class is java/lang/Class, which cannot be allocated directly
986 bool can_be_fastpath_allocated() const {
987 return !layout_helper_needs_slow_path(layout_helper());
988 }
989
990 // Java vtable/itable
991 klassVtable* vtable() const; // return new klassVtable wrapper
992 inline Method* method_at_vtable(int index);
993 klassItable* itable() const; // return new klassItable wrapper
994 Method* method_at_itable(Klass* holder, int index, TRAPS);
995
996 #if INCLUDE_JVMTI
997 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
998 #endif // INCLUDE_JVMTI
999
1000 // Garbage collection
1001 void oop_follow_contents(oop obj);
1002 int oop_adjust_pointers(oop obj);
1003
1004 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1005 void clean_implementors_list(BoolObjectClosure* is_alive);
1006 void clean_method_data(BoolObjectClosure* is_alive);
1007 void clean_dependent_nmethods();
1008
1009 // Explicit metaspace deallocation of fields
1010 // For RedefineClasses and class file parsing errors, we need to deallocate
1011 // instanceKlasses and the metadata they point to.
1012 void deallocate_contents(ClassLoaderData* loader_data);
1013 static void deallocate_methods(ClassLoaderData* loader_data,
1014 Array<Method*>* methods);
1015 void static deallocate_interfaces(ClassLoaderData* loader_data,
1016 Klass* super_klass,
1017 Array<Klass*>* local_interfaces,
1018 Array<Klass*>* transitive_interfaces);
1019
1020 // The constant pool is on stack if any of the methods are executing or
1021 // referenced by handles.
1022 bool on_stack() const { return _constants->on_stack(); }
1023
1024 // callbacks for actions during class unloading
1025 static void notify_unload_class(InstanceKlass* ik);
1026 static void release_C_heap_structures(InstanceKlass* ik);
1027
1028 // Parallel Scavenge and Parallel Old
1029 PARALLEL_GC_DECLS
1030
1031 // Naming
1032 const char* signature_name() const;
1033
1034 // Iterators
1035 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
1036 return oop_oop_iterate_v(obj, blk);
1037 }
1038
1039 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
1040 return oop_oop_iterate_v_m(obj, blk, mr);
1041 }
1042
1043 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
1044 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
1045 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
1046 MemRegion mr);
1047
1048 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
1049 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
1050
1051 #if INCLUDE_ALL_GCS
1052 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
1053 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
1054
1055 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1056 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1057 #endif // INCLUDE_ALL_GCS
1058
1059 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1060
1061 public:
1062 void set_in_error_state() {
1063 assert(DumpSharedSpaces, "only call this when dumping archive");
1064 _init_state = initialization_error;
1065 }
1066 bool check_sharing_error_state();
1067
1068 private:
1069 // initialization state
1070 #ifdef ASSERT
1071 void set_init_state(ClassState state);
1072 #else
1073 void set_init_state(ClassState state) { _init_state = (u1)state; }
1074 #endif
1075 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1076 void set_init_thread(Thread *thread) { _init_thread = thread; }
1077
1078 // The RedefineClasses() API can cause new method idnums to be needed
1079 // which will cause the caches to grow. Safety requires different
1080 // cache management logic if the caches can grow instead of just
1081 // going from NULL to non-NULL.
1082 bool idnum_can_increment() const { return has_been_redefined(); }
1083 jmethodID* methods_jmethod_ids_acquire() const
1084 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1085 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1086 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1087
1088 // Lock during initialization
1089 public:
1090 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1091 // Must be one per class and it has to be a VM internal object so java code
1092 // cannot lock it (like the mirror).
1093 // It has to be an object not a Mutex because it's held through java calls.
1094 oop init_lock() const;
1095 private:
1096 void fence_and_clear_init_lock();
1097
1098 // Static methods that are used to implement member methods where an exposed this pointer
1099 // is needed due to possible GCs
1100 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1101 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1102 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1103 static void initialize_super_interfaces (instanceKlassHandle this_oop, TRAPS);
1104 static void eager_initialize_impl (instanceKlassHandle this_oop);
1105 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1106 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1107 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1108 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1109 /* jni_id_for_impl for jfieldID only */
1110 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1111
1112 // Returns the array class for the n'th dimension
1113 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1114
1115 // Returns the array class with this class as element type
1116 Klass* array_klass_impl(bool or_null, TRAPS);
1117
1118 // find a local method (returns NULL if not found)
1119 Method* find_method_impl(Symbol* name, Symbol* signature,
1120 OverpassLookupMode overpass_mode,
1121 StaticLookupMode static_mode,
1122 PrivateLookupMode private_mode) const;
1123 static Method* find_method_impl(Array<Method*>* methods,
1124 Symbol* name, Symbol* signature,
1125 OverpassLookupMode overpass_mode,
1126 StaticLookupMode static_mode,
1127 PrivateLookupMode private_mode);
1128
1129 // Free CHeap allocated fields.
1130 void release_C_heap_structures();
1131
1132 // RedefineClasses support
1133 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1134 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1135 public:
1136 // CDS support - remove and restore oops from metadata. Oops are not shared.
1137 virtual void remove_unshareable_info();
1138 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1139
1140 // jvm support
1141 jint compute_modifier_flags(TRAPS) const;
1142
1143 // JSR-292 support
1144 MemberNameTable* member_names() { return _member_names; }
1145 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1146 oop add_member_name(Handle member_name, bool intern);
1147
1148 public:
1149 // JVMTI support
1150 jint jvmti_class_status() const;
1151
1152 public:
1153 // Printing
1154 #ifndef PRODUCT
1155 void print_on(outputStream* st) const;
1156 #endif
1157 void print_value_on(outputStream* st) const;
1158
1159 void oop_print_value_on(oop obj, outputStream* st);
1160
1161 #ifndef PRODUCT
1162 void oop_print_on (oop obj, outputStream* st);
1163
1164 void print_dependent_nmethods(bool verbose = false);
1165 bool is_dependent_nmethod(nmethod* nm);
1166 #endif
1167
1168 const char* internal_name() const;
1169
1170 // Verification
1171 void verify_on(outputStream* st);
1172
1173 void oop_verify_on(oop obj, outputStream* st);
1174 };
1175
1176 inline Method* InstanceKlass::method_at_vtable(int index) {
1177 #ifndef PRODUCT
1178 assert(index >= 0, "valid vtable index");
1179 if (DebugVtables) {
1180 verify_vtable_index(index);
1181 }
1182 #endif
1183 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1184 return ve[index].method();
1185 }
1186
1187 // for adding methods
1188 // UNSET_IDNUM return means no more ids available
1189 inline u2 InstanceKlass::next_method_idnum() {
1190 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1191 return ConstMethod::UNSET_IDNUM; // no more ids available
1192 } else {
1193 return _idnum_allocated_count++;
1194 }
1195 }
1196
1197
1198 /* JNIid class for jfieldIDs only */
1199 class JNIid: public CHeapObj<mtClass> {
1200 friend class VMStructs;
1201 private:
1202 Klass* _holder;
1203 JNIid* _next;
1204 int _offset;
1205 #ifdef ASSERT
1206 bool _is_static_field_id;
1207 #endif
1208
1209 public:
1210 // Accessors
1211 Klass* holder() const { return _holder; }
1212 int offset() const { return _offset; }
1213 JNIid* next() { return _next; }
1214 // Constructor
1215 JNIid(Klass* holder, int offset, JNIid* next);
1216 // Identifier lookup
1217 JNIid* find(int offset);
1218
1219 bool find_local_field(fieldDescriptor* fd) {
1220 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1221 }
1222
1223 static void deallocate(JNIid* id);
1224 // Debugging
1225 #ifdef ASSERT
1226 bool is_static_field_id() const { return _is_static_field_id; }
1227 void set_is_static_field_id() { _is_static_field_id = true; }
1228 #endif
1229 void verify(Klass* holder);
1230 };
1231
1232
1233 //
1234 // nmethodBucket is used to record dependent nmethods for
1235 // deoptimization. nmethod dependencies are actually <klass, method>
1236 // pairs but we really only care about the klass part for purposes of
1237 // finding nmethods which might need to be deoptimized. Instead of
1238 // recording the method, a count of how many times a particular nmethod
1239 // was recorded is kept. This ensures that any recording errors are
1240 // noticed since an nmethod should be removed as many times are it's
1241 // added.
1242 //
1243 class nmethodBucket: public CHeapObj<mtClass> {
1244 friend class VMStructs;
1245 private:
1246 nmethod* _nmethod;
1247 int _count;
1248 nmethodBucket* _next;
1249
1250 public:
1251 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1252 _nmethod = nmethod;
1253 _next = next;
1254 _count = 1;
1255 }
1256 int count() { return _count; }
1257 int increment() { _count += 1; return _count; }
1258 int decrement();
1259 nmethodBucket* next() { return _next; }
1260 void set_next(nmethodBucket* b) { _next = b; }
1261 nmethod* get_nmethod() { return _nmethod; }
1262 };
1263
1264 // An iterator that's used to access the inner classes indices in the
1265 // InstanceKlass::_inner_classes array.
1266 class InnerClassesIterator : public StackObj {
1267 private:
1268 Array<jushort>* _inner_classes;
1269 int _length;
1270 int _idx;
1271 public:
1272
1273 InnerClassesIterator(instanceKlassHandle k) {
1274 _inner_classes = k->inner_classes();
1275 if (k->inner_classes() != NULL) {
1276 _length = _inner_classes->length();
1277 // The inner class array's length should be the multiple of
1278 // inner_class_next_offset if it only contains the InnerClasses
1279 // attribute data, or it should be
1280 // n*inner_class_next_offset+enclosing_method_attribute_size
1281 // if it also contains the EnclosingMethod data.
1282 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1283 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1284 "just checking");
1285 // Remove the enclosing_method portion if exists.
1286 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1287 _length -= InstanceKlass::enclosing_method_attribute_size;
1288 }
1289 } else {
1290 _length = 0;
1291 }
1292 _idx = 0;
1293 }
1294
1295 int length() const {
1296 return _length;
1297 }
1298
1299 void next() {
1300 _idx += InstanceKlass::inner_class_next_offset;
1301 }
1302
1303 bool done() const {
1304 return (_idx >= _length);
1305 }
1306
1307 u2 inner_class_info_index() const {
1308 return _inner_classes->at(
1309 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1310 }
1311
1312 void set_inner_class_info_index(u2 index) {
1313 _inner_classes->at_put(
1314 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1315 }
1316
1317 u2 outer_class_info_index() const {
1318 return _inner_classes->at(
1319 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1320 }
1321
1322 void set_outer_class_info_index(u2 index) {
1323 _inner_classes->at_put(
1324 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1325 }
1326
1327 u2 inner_name_index() const {
1328 return _inner_classes->at(
1329 _idx + InstanceKlass::inner_class_inner_name_offset);
1330 }
1331
1332 void set_inner_name_index(u2 index) {
1333 _inner_classes->at_put(
1334 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1335 }
1336
1337 u2 inner_access_flags() const {
1338 return _inner_classes->at(
1339 _idx + InstanceKlass::inner_class_access_flags_offset);
1340 }
1341 };
1342
1343 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP