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 #if INCLUDE_JFR
42 #include "jfr/support/jfrKlassExtension.hpp"
43 #endif
44
45 // An InstanceKlass is the VM level representation of a Java class.
46 // It contains all information needed for at class at execution runtime.
47
48 // InstanceKlass layout:
49 // [C++ vtbl pointer ] Klass
50 // [subtype cache ] Klass
51 // [instance size ] Klass
52 // [java mirror ] Klass
53 // [super ] Klass
54 // [access_flags ] Klass
55 // [name ] Klass
56 // [first subklass ] Klass
57 // [next sibling ] Klass
58 // [array klasses ]
59 // [methods ]
60 // [local interfaces ]
61 // [transitive interfaces ]
62 // [fields ]
63 // [constants ]
64 // [class loader ]
65 // [source file name ]
66 // [inner classes ]
67 // [static field size ]
68 // [nonstatic field size ]
69 // [static oop fields size ]
70 // [nonstatic oop maps size ]
71 // [has finalize method ]
72 // [deoptimization mark bit ]
73 // [initialization state ]
74 // [initializing thread ]
75 // [Java vtable length ]
76 // [oop map cache (stack maps) ]
77 // [EMBEDDED Java vtable ] size in words = vtable_len
78 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
79 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
80 // indicating where oops are located in instances of this klass.
81 // [EMBEDDED implementor of the interface] only exist for interface
82 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
83
84
85 // forward declaration for class -- see below for definition
86 class SuperTypeClosure;
87 class JNIid;
88 class jniIdMapBase;
89 class BreakpointInfo;
90 class fieldDescriptor;
91 class DepChange;
92 class nmethodBucket;
93 class JvmtiCachedClassFieldMap;
94 class MemberNameTable;
95
96 // This is used in iterators below.
97 class FieldClosure: public StackObj {
98 public:
99 virtual void do_field(fieldDescriptor* fd) = 0;
100 };
101
102 #ifndef PRODUCT
103 // Print fields.
104 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
105 class FieldPrinter: public FieldClosure {
106 oop _obj;
107 outputStream* _st;
108 public:
109 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
110 void do_field(fieldDescriptor* fd);
111 };
112 #endif // !PRODUCT
113
114 // ValueObjs embedded in klass. Describes where oops are located in instances of
115 // this klass.
116 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
117 public:
118 // Byte offset of the first oop mapped by this block.
119 int offset() const { return _offset; }
120 void set_offset(int offset) { _offset = offset; }
121
122 // Number of oops in this block.
123 uint count() const { return _count; }
124 void set_count(uint count) { _count = count; }
125
126 // sizeof(OopMapBlock) in HeapWords.
127 static const int size_in_words() {
128 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
129 LogHeapWordSize;
130 }
131
132 private:
133 int _offset;
134 uint _count;
135 };
136
137 struct JvmtiCachedClassFileData;
138
139 class InstanceKlass: public Klass {
140 friend class VMStructs;
141 friend class ClassFileParser;
142 friend class CompileReplay;
143
144 protected:
145 // Constructor
146 InstanceKlass(int vtable_len,
147 int itable_len,
148 int static_field_size,
149 int nonstatic_oop_map_size,
150 ReferenceType rt,
151 AccessFlags access_flags,
152 bool is_anonymous);
153 public:
154 static InstanceKlass* allocate_instance_klass(
155 ClassLoaderData* loader_data,
156 int vtable_len,
157 int itable_len,
158 int static_field_size,
159 int nonstatic_oop_map_size,
160 ReferenceType rt,
161 AccessFlags access_flags,
162 Symbol* name,
163 Klass* super_klass,
164 bool is_anonymous,
165 TRAPS);
166
167 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
168
169 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
170 // of the class loading & initialization procedure, and the use of the states.
171 enum ClassState {
172 allocated, // allocated (but not yet linked)
173 loaded, // loaded and inserted in class hierarchy (but not linked yet)
174 linked, // successfully linked/verified (but not initialized yet)
175 being_initialized, // currently running class initializer
176 fully_initialized, // initialized (successfull final state)
177 initialization_error // error happened during initialization
178 };
179
180 static int number_of_instance_classes() { return _total_instanceKlass_count; }
181
182 private:
183 static volatile int _total_instanceKlass_count;
184
185 protected:
186 // Annotations for this class
187 Annotations* _annotations;
188 // Array classes holding elements of this class.
189 Klass* _array_klasses;
190 // Constant pool for this class.
191 ConstantPool* _constants;
192 // The InnerClasses attribute and EnclosingMethod attribute. The
193 // _inner_classes is an array of shorts. If the class has InnerClasses
194 // attribute, then the _inner_classes array begins with 4-tuples of shorts
195 // [inner_class_info_index, outer_class_info_index,
196 // inner_name_index, inner_class_access_flags] for the InnerClasses
197 // attribute. If the EnclosingMethod attribute exists, it occupies the
198 // last two shorts [class_index, method_index] of the array. If only
199 // the InnerClasses attribute exists, the _inner_classes array length is
200 // number_of_inner_classes * 4. If the class has both InnerClasses
201 // and EnclosingMethod attributes the _inner_classes array length is
202 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
203 Array<jushort>* _inner_classes;
204
205 // the source debug extension for this klass, NULL if not specified.
206 // Specified as UTF-8 string without terminating zero byte in the classfile,
207 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
208 char* _source_debug_extension;
209 // Array name derived from this class which needs unreferencing
210 // if this class is unloaded.
211 Symbol* _array_name;
212
213 // Number of heapOopSize words used by non-static fields in this klass
214 // (including inherited fields but after header_size()).
215 int _nonstatic_field_size;
216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
217 // Constant pool index to the utf8 entry of the Generic signature,
218 // or 0 if none.
219 u2 _generic_signature_index;
220 // Constant pool index to the utf8 entry for the name of source file
221 // containing this klass, 0 if not specified.
222 u2 _source_file_name_index;
223 u2 _static_oop_field_count;// number of static oop fields in this klass
224 u2 _java_fields_count; // The number of declared Java fields
225 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
226
227 // _is_marked_dependent can be set concurrently, thus cannot be part of the
228 // _misc_flags.
229 bool _is_marked_dependent; // used for marking during flushing and deoptimization
230 bool _has_unloaded_dependent;
231
232 enum {
233 _misc_rewritten = 1 << 0, // methods rewritten.
234 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
235 _misc_should_verify_class = 1 << 2, // allow caching of preverification
236 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
237 _misc_is_contended = 1 << 4, // marked with contended annotation
238 _misc_has_default_methods = 1 << 5, // class/superclass/implemented interfaces has default methods
239 _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access)
240 _misc_has_been_redefined = 1 << 7 // class has been redefined
241 };
242 u2 _misc_flags;
243 u2 _minor_version; // minor version number of class file
244 u2 _major_version; // major version number of class file
245 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
246 int _vtable_len; // length of Java vtable (in words)
247 int _itable_len; // length of Java itable (in words)
248 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
249 MemberNameTable* _member_names; // Member names
250 JNIid* _jni_ids; // First JNI identifier for static fields in this class
251 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
252 nmethodBucket* _dependencies; // list of dependent nmethods
253 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
254 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
255 // Linked instanceKlasses of previous versions
256 InstanceKlass* _previous_versions;
257 // JVMTI fields can be moved to their own structure - see 6315920
258 // JVMTI: cached class file, before retransformable agent modified it in CFLH
259 JvmtiCachedClassFileData* _cached_class_file;
260
261 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
262
263 // Class states are defined as ClassState (see above).
264 // Place the _init_state here to utilize the unused 2-byte after
265 // _idnum_allocated_count.
266 u1 _init_state; // state of class
267 u1 _reference_type; // reference type
268
269 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
270
271 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
272
273 // Method array.
274 Array<Method*>* _methods;
275 // Default Method Array, concrete methods inherited from interfaces
276 Array<Method*>* _default_methods;
277 // Interface (Klass*s) this class declares locally to implement.
278 Array<Klass*>* _local_interfaces;
279 // Interface (Klass*s) this class implements transitively.
280 Array<Klass*>* _transitive_interfaces;
281 // Int array containing the original order of method in the class file (for JVMTI).
282 Array<int>* _method_ordering;
283 // Int array containing the vtable_indices for default_methods
284 // offset matches _default_methods offset
285 Array<int>* _default_vtable_indices;
286
287 // Instance and static variable information, starts with 6-tuples of shorts
288 // [access, name index, sig index, initval index, low_offset, high_offset]
289 // for all fields, followed by the generic signature data at the end of
290 // the array. Only fields with generic signature attributes have the generic
291 // signature data set in the array. The fields array looks like following:
292 //
293 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
294 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
295 // ...
296 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
297 // [generic signature index]
298 // [generic signature index]
299 // ...
300 Array<u2>* _fields;
301
302 // embedded Java vtable follows here
303 // embedded Java itables follows here
304 // embedded static fields follows here
305 // embedded nonstatic oop-map blocks follows here
306 // embedded implementor of this interface follows here
307 // The embedded implementor only exists if the current klass is an
308 // iterface. The possible values of the implementor fall into following
309 // three cases:
310 // NULL: no implementor.
311 // A Klass* that's not itself: one implementor.
312 // Itself: more than one implementors.
313 // embedded host klass follows here
314 // The embedded host klass only exists in an anonymous class for
315 // dynamic language support (JSR 292 enabled). The host class grants
316 // its access privileges to this class also. The host class is either
317 // named, or a previously loaded anonymous class. A non-anonymous class
318 // or an anonymous class loaded through normal classloading does not
319 // have this embedded field.
320 //
321
322 friend class SystemDictionary;
323
324 public:
325 bool has_nonstatic_fields() const {
326 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
327 }
328 void set_has_nonstatic_fields(bool b) {
329 if (b) {
330 _misc_flags |= _misc_has_nonstatic_fields;
331 } else {
332 _misc_flags &= ~_misc_has_nonstatic_fields;
333 }
334 }
335
336 // field sizes
337 int nonstatic_field_size() const { return _nonstatic_field_size; }
338 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
339
340 int static_field_size() const { return _static_field_size; }
341 void set_static_field_size(int size) { _static_field_size = size; }
342
343 int static_oop_field_count() const { return (int)_static_oop_field_count; }
344 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
345
346 // Java vtable
347 int vtable_length() const { return _vtable_len; }
348 void set_vtable_length(int len) { _vtable_len = len; }
349
350 // Java itable
351 int itable_length() const { return _itable_len; }
352 void set_itable_length(int len) { _itable_len = len; }
353
354 // array klasses
355 Klass* array_klasses() const { return _array_klasses; }
356 void set_array_klasses(Klass* k) { _array_klasses = k; }
357
358 // methods
359 Array<Method*>* methods() const { return _methods; }
360 void set_methods(Array<Method*>* a) { _methods = a; }
361 Method* method_with_idnum(int idnum);
362 Method* method_with_orig_idnum(int idnum);
363 Method* method_with_orig_idnum(int idnum, int version);
364
365 // method ordering
366 Array<int>* method_ordering() const { return _method_ordering; }
367 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
368 void copy_method_ordering(intArray* m, TRAPS);
369
370 // default_methods
371 Array<Method*>* default_methods() const { return _default_methods; }
372 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
373
374 // default method vtable_indices
375 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
376 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
377 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
378
379 // interfaces
380 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
381 void set_local_interfaces(Array<Klass*>* a) {
382 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
383 _local_interfaces = a; }
384
385 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
386 void set_transitive_interfaces(Array<Klass*>* a) {
387 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
388 _transitive_interfaces = a;
389 }
390
391 private:
392 friend class fieldDescriptor;
393 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
394
395 public:
396 int field_offset (int index) const { return field(index)->offset(); }
397 int field_access_flags(int index) const { return field(index)->access_flags(); }
398 Symbol* field_name (int index) const { return field(index)->name(constants()); }
399 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
400
401 // Number of Java declared fields
402 int java_fields_count() const { return (int)_java_fields_count; }
403
404 Array<u2>* fields() const { return _fields; }
405 void set_fields(Array<u2>* f, u2 java_fields_count) {
406 guarantee(_fields == NULL || f == NULL, "Just checking");
407 _fields = f;
408 _java_fields_count = java_fields_count;
409 }
410
411 // inner classes
412 Array<u2>* inner_classes() const { return _inner_classes; }
413 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
414
415 enum InnerClassAttributeOffset {
416 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
417 inner_class_inner_class_info_offset = 0,
418 inner_class_outer_class_info_offset = 1,
419 inner_class_inner_name_offset = 2,
420 inner_class_access_flags_offset = 3,
421 inner_class_next_offset = 4
422 };
423
424 enum EnclosingMethodAttributeOffset {
425 enclosing_method_class_index_offset = 0,
426 enclosing_method_method_index_offset = 1,
427 enclosing_method_attribute_size = 2
428 };
429
430 // method override check
431 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
432
433 // package
434 bool is_same_class_package(Klass* class2);
435 bool is_same_class_package(oop classloader2, Symbol* classname2);
436 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
437
438 // find an enclosing class (defined where original code was, in jvm.cpp!)
439 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
440 instanceKlassHandle self(THREAD, this);
441 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
442 }
443 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
444 bool* inner_is_member, TRAPS);
445
446 // tell if two classes have the same enclosing class (at package level)
447 bool is_same_package_member(Klass* class2, TRAPS) {
448 instanceKlassHandle self(THREAD, this);
449 return is_same_package_member_impl(self, class2, THREAD);
450 }
451 static bool is_same_package_member_impl(instanceKlassHandle self,
452 Klass* class2, TRAPS);
453
454 // initialization state
455 bool is_loaded() const { return _init_state >= loaded; }
456 bool is_linked() const { return _init_state >= linked; }
457 bool is_initialized() const { return _init_state == fully_initialized; }
458 bool is_not_initialized() const { return _init_state < being_initialized; }
459 bool is_being_initialized() const { return _init_state == being_initialized; }
460 bool is_in_error_state() const { return _init_state == initialization_error; }
461 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
462 ClassState init_state() { return (ClassState)_init_state; }
463 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
464
465 // defineClass specified verification
466 bool should_verify_class() const {
467 return (_misc_flags & _misc_should_verify_class) != 0;
468 }
469 void set_should_verify_class(bool value) {
470 if (value) {
471 _misc_flags |= _misc_should_verify_class;
472 } else {
473 _misc_flags &= ~_misc_should_verify_class;
474 }
475 }
476
477 // marking
478 bool is_marked_dependent() const { return _is_marked_dependent; }
479 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
480
481 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
482 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
483
484 // initialization (virtuals from Klass)
485 bool should_be_initialized() const; // means that initialize should be called
486 void initialize(TRAPS);
487 void link_class(TRAPS);
488 bool link_class_or_fail(TRAPS); // returns false on failure
489 void unlink_class();
490 void rewrite_class(TRAPS);
491 void link_methods(TRAPS);
492 Method* class_initializer();
493
494 // set the class to initialized if no static initializer is present
495 void eager_initialize(Thread *thread);
496
497 // reference type
498 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
499 void set_reference_type(ReferenceType t) {
500 assert(t == (u1)t, "overflow");
501 _reference_type = (u1)t;
502 }
503
504 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
505
506 // find local field, returns true if found
507 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
508 // find field in direct superinterfaces, returns the interface in which the field is defined
509 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
510 // find field 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, fieldDescriptor* fd) const;
512 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
513 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
514
515 // find a non-static or static field given its offset within the class.
516 bool contains_field_offset(int offset) {
517 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
518 }
519
520 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
521 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
522
523 // find a local method (returns NULL if not found)
524 Method* find_method(Symbol* name, Symbol* signature) const;
525 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
526
527 // find a local method, but skip static methods
528 Method* find_instance_method(Symbol* name, Symbol* signature);
529 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
530
531 // find a local method (returns NULL if not found)
532 Method* find_local_method(Symbol* name, Symbol* signature,
533 OverpassLookupMode overpass_mode,
534 StaticLookupMode static_mode,
535 PrivateLookupMode private_mode) const;
536
537 // find a local method from given methods array (returns NULL if not found)
538 static Method* find_local_method(Array<Method*>* methods,
539 Symbol* name, Symbol* signature,
540 OverpassLookupMode overpass_mode,
541 StaticLookupMode static_mode,
542 PrivateLookupMode private_mode);
543
544 // true if method matches signature and conforms to skipping_X conditions.
545 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
546
547 // find a local method index in methods or default_methods (returns -1 if not found)
548 static int find_method_index(Array<Method*>* methods,
549 Symbol* name, Symbol* signature,
550 OverpassLookupMode overpass_mode,
551 StaticLookupMode static_mode,
552 PrivateLookupMode private_mode);
553
554
555 // lookup operation (returns NULL if not found)
556 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
557
558 // lookup a method in all the interfaces that this class implements
559 // (returns NULL if not found)
560 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
561
562 // lookup a method in local defaults then in all interfaces
563 // (returns NULL if not found)
564 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
565
566 // Find method indices by name. If a method with the specified name is
567 // found the index to the first method is returned, and 'end' is filled in
568 // with the index of first non-name-matching method. If no method is found
569 // -1 is returned.
570 int find_method_by_name(Symbol* name, int* end);
571 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
572
573 // constant pool
574 ConstantPool* constants() const { return _constants; }
575 void set_constants(ConstantPool* c) { _constants = c; }
576
577 // protection domain
578 oop protection_domain() const;
579
580 // signers
581 objArrayOop signers() const;
582
583 // host class
584 Klass* host_klass() const {
585 Klass** hk = (Klass**)adr_host_klass();
586 if (hk == NULL) {
587 assert(!is_anonymous(), "Anonymous classes have host klasses");
588 return NULL;
589 } else {
590 assert(*hk != NULL, "host klass should always be set if the address is not null");
591 assert(is_anonymous(), "Only anonymous classes have host klasses");
592 return *hk;
593 }
594 }
595 void set_host_klass(Klass* host) {
596 assert(is_anonymous(), "not anonymous");
597 Klass** addr = (Klass**)adr_host_klass();
598 assert(addr != NULL, "no reversed space");
599 if (addr != NULL) {
600 *addr = host;
601 }
602 }
603 bool has_host_klass() const {
604 return adr_host_klass() != NULL;
605 }
606 bool is_anonymous() const {
607 return (_misc_flags & _misc_is_anonymous) != 0;
608 }
609 void set_is_anonymous(bool value) {
610 if (value) {
611 _misc_flags |= _misc_is_anonymous;
612 } else {
613 _misc_flags &= ~_misc_is_anonymous;
614 }
615 }
616
617 // Oop that keeps the metadata for this class from being unloaded
618 // in places where the metadata is stored in other places, like nmethods
619 oop klass_holder() const {
620 return is_anonymous() ? java_mirror() : class_loader();
621 }
622
623 bool is_contended() const {
624 return (_misc_flags & _misc_is_contended) != 0;
625 }
626 void set_is_contended(bool value) {
627 if (value) {
628 _misc_flags |= _misc_is_contended;
629 } else {
630 _misc_flags &= ~_misc_is_contended;
631 }
632 }
633
634 // source file name
635 Symbol* source_file_name() const {
636 return (_source_file_name_index == 0) ?
637 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
638 }
639 u2 source_file_name_index() const {
640 return _source_file_name_index;
641 }
642 void set_source_file_name_index(u2 sourcefile_index) {
643 _source_file_name_index = sourcefile_index;
644 }
645
646 // minor and major version numbers of class file
647 u2 minor_version() const { return _minor_version; }
648 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
649 u2 major_version() const { return _major_version; }
650 void set_major_version(u2 major_version) { _major_version = major_version; }
651
652 // source debug extension
653 char* source_debug_extension() const { return _source_debug_extension; }
654 void set_source_debug_extension(char* array, int length);
655
656 // symbol unloading support (refcount already added)
657 Symbol* array_name() { return _array_name; }
658 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
659
660 // nonstatic oop-map blocks
661 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
662 return oop_map_count * OopMapBlock::size_in_words();
663 }
664 unsigned int nonstatic_oop_map_count() const {
665 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
666 }
667 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
668 void set_nonstatic_oop_map_size(int words) {
669 _nonstatic_oop_map_size = words;
670 }
671
672 // RedefineClasses() support for previous versions:
673 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
674
675 InstanceKlass* previous_versions() const { return _previous_versions; }
676
677 bool has_been_redefined() const {
678 return (_misc_flags & _misc_has_been_redefined) != 0;
679 }
680 void set_has_been_redefined() {
681 _misc_flags |= _misc_has_been_redefined;
682 }
683
684 void init_previous_versions() {
685 _previous_versions = NULL;
686 }
687
688
689 InstanceKlass* get_klass_version(int version) {
690 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
691 if (ik->constants()->version() == version) {
692 return ik;
693 }
694 }
695 return NULL;
696 }
697
698 static void purge_previous_versions(InstanceKlass* ik);
699
700 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
701 void set_cached_class_file(JvmtiCachedClassFileData *data) {
702 _cached_class_file = data;
703 }
704 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
705 jint get_cached_class_file_len();
706 unsigned char * get_cached_class_file_bytes();
707
708 // JVMTI: Support for caching of field indices, types, and offsets
709 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
710 _jvmti_cached_class_field_map = descriptor;
711 }
712 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
713 return _jvmti_cached_class_field_map;
714 }
715
716 bool has_default_methods() const {
717 return (_misc_flags & _misc_has_default_methods) != 0;
718 }
719 void set_has_default_methods(bool b) {
720 if (b) {
721 _misc_flags |= _misc_has_default_methods;
722 } else {
723 _misc_flags &= ~_misc_has_default_methods;
724 }
725 }
726
727 bool declares_default_methods() const {
728 return (_misc_flags & _misc_declares_default_methods) != 0;
729 }
730 void set_declares_default_methods(bool b) {
731 if (b) {
732 _misc_flags |= _misc_declares_default_methods;
733 } else {
734 _misc_flags &= ~_misc_declares_default_methods;
735 }
736 }
737
738 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
739 inline u2 next_method_idnum();
740 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
741
742 // generics support
743 Symbol* generic_signature() const {
744 return (_generic_signature_index == 0) ?
745 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
746 }
747 u2 generic_signature_index() const {
748 return _generic_signature_index;
749 }
750 void set_generic_signature_index(u2 sig_index) {
751 _generic_signature_index = sig_index;
752 }
753
754 u2 enclosing_method_data(int offset);
755 u2 enclosing_method_class_index() {
756 return enclosing_method_data(enclosing_method_class_index_offset);
757 }
758 u2 enclosing_method_method_index() {
759 return enclosing_method_data(enclosing_method_method_index_offset);
760 }
761 void set_enclosing_method_indices(u2 class_index,
762 u2 method_index);
763
764 // jmethodID support
765 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
766 methodHandle method_h);
767 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
768 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
769 jmethodID* to_dealloc_id_p,
770 jmethodID** to_dealloc_jmeths_p);
771 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
772 size_t *length_p, jmethodID* id_p);
773 jmethodID jmethod_id_or_null(Method* method);
774
775 // annotations support
776 Annotations* annotations() const { return _annotations; }
777 void set_annotations(Annotations* anno) { _annotations = anno; }
778
779 AnnotationArray* class_annotations() const {
780 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
781 }
782 Array<AnnotationArray*>* fields_annotations() const {
783 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
784 }
785 AnnotationArray* class_type_annotations() const {
786 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
787 }
788 Array<AnnotationArray*>* fields_type_annotations() const {
789 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
790 }
791 // allocation
792 instanceOop allocate_instance(TRAPS);
793
794 // additional member function to return a handle
795 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
796
797 objArrayOop allocate_objArray(int n, int length, TRAPS);
798 // Helper function
799 static instanceOop register_finalizer(instanceOop i, TRAPS);
800
801 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
802 // if not, throw either an Error or an Exception.
803 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
804
805 // initialization
806 void call_class_initializer(TRAPS);
807 void set_initialization_state_and_notify(ClassState state, TRAPS);
808
809 // OopMapCache support
810 OopMapCache* oop_map_cache() { return _oop_map_cache; }
811 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
812 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
813
814 // JNI identifier support (for static fields - for jni performance)
815 JNIid* jni_ids() { return _jni_ids; }
816 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
817 JNIid* jni_id_for(int offset);
818
819 // maintenance of deoptimization dependencies
820 int mark_dependent_nmethods(DepChange& changes);
821 void add_dependent_nmethod(nmethod* nm);
822 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
823
824 // On-stack replacement support
825 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
826 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
827 void add_osr_nmethod(nmethod* n);
828 void remove_osr_nmethod(nmethod* n);
829 int mark_osr_nmethods(const Method* m);
830 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
831
832 // Breakpoint support (see methods on Method* for details)
833 BreakpointInfo* breakpoints() const { return _breakpoints; };
834 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
835
836 // support for stub routines
837 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
838 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
839 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
840
841 // subclass/subinterface checks
842 bool implements_interface(Klass* k) const;
843 bool is_same_or_direct_interface(Klass* k) const;
844
845 #ifdef ASSERT
846 // check whether this class or one of its superclasses was redefined
847 bool has_redefined_this_or_super() const;
848 #endif
849
850 // Access to the implementor of an interface.
851 Klass* implementor() const
852 {
853 Klass** k = adr_implementor();
854 if (k == NULL) {
855 return NULL;
856 } else {
857 return *k;
858 }
859 }
860
861 void set_implementor(Klass* k) {
862 assert(is_interface(), "not interface");
863 Klass** addr = adr_implementor();
864 assert(addr != NULL, "null addr");
865 if (addr != NULL) {
866 *addr = k;
867 }
868 }
869
870 int nof_implementors() const {
871 Klass* k = implementor();
872 if (k == NULL) {
873 return 0;
874 } else if (k != this) {
875 return 1;
876 } else {
877 return 2;
878 }
879 }
880
881 void add_implementor(Klass* k); // k is a new class that implements this interface
882 void init_implementor(); // initialize
883
884 // link this class into the implementors list of every interface it implements
885 void process_interfaces(Thread *thread);
886
887 // virtual operations from Klass
888 bool is_leaf_class() const { return _subklass == NULL; }
889 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
890 bool compute_is_subtype_of(Klass* k);
891 bool can_be_primary_super_slow() const;
892 int oop_size(oop obj) const { return size_helper(); }
893 bool oop_is_instance_slow() const { return true; }
894
895 // Iterators
896 void do_local_static_fields(FieldClosure* cl);
897 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
898 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
899
900 void methods_do(void f(Method* method));
901 void array_klasses_do(void f(Klass* k));
902 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
903 bool super_types_do(SuperTypeClosure* blk);
904
905 // Casting from Klass*
906 static InstanceKlass* cast(Klass* k) {
907 assert(k == NULL || k->is_klass(), "must be");
908 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
909 return (InstanceKlass*) k;
910 }
911
912 InstanceKlass* java_super() const {
913 return (super() == NULL) ? NULL : cast(super());
914 }
915
916 // Sizing (in words)
917 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
918
919 static int size(int vtable_length, int itable_length,
920 int nonstatic_oop_map_size,
921 bool is_interface, bool is_anonymous) {
922 return align_object_size(header_size() +
923 align_object_offset(vtable_length) +
924 align_object_offset(itable_length) +
925 ((is_interface || is_anonymous) ?
926 align_object_offset(nonstatic_oop_map_size) :
927 nonstatic_oop_map_size) +
928 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
929 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
930 }
931 int size() const { return size(vtable_length(),
932 itable_length(),
933 nonstatic_oop_map_size(),
934 is_interface(),
935 is_anonymous());
936 }
937 #if INCLUDE_SERVICES
938 virtual void collect_statistics(KlassSizeStats *sz) const;
939 #endif
940
941 static int vtable_start_offset() { return header_size(); }
942 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
943
944 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
945 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
946 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
947
948 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
949
950 address static_field_addr(int offset);
951
952 OopMapBlock* start_of_nonstatic_oop_maps() const {
953 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
954 }
955
956 Klass** end_of_nonstatic_oop_maps() const {
957 return (Klass**)(start_of_nonstatic_oop_maps() +
958 nonstatic_oop_map_count());
959 }
960
961 Klass** adr_implementor() const {
962 if (is_interface()) {
963 return (Klass**)end_of_nonstatic_oop_maps();
964 } else {
965 return NULL;
966 }
967 };
968
969 Klass** adr_host_klass() const {
970 if (is_anonymous()) {
971 Klass** adr_impl = adr_implementor();
972 if (adr_impl != NULL) {
973 return adr_impl + 1;
974 } else {
975 return end_of_nonstatic_oop_maps();
976 }
977 } else {
978 return NULL;
979 }
980 }
981
982 // Use this to return the size of an instance in heap words:
983 int size_helper() const {
984 return layout_helper_to_size_helper(layout_helper());
985 }
986
987 // This bit is initialized in classFileParser.cpp.
988 // It is false under any of the following conditions:
989 // - the class is abstract (including any interface)
990 // - the class has a finalizer (if !RegisterFinalizersAtInit)
991 // - the class size is larger than FastAllocateSizeLimit
992 // - the class is java/lang/Class, which cannot be allocated directly
993 bool can_be_fastpath_allocated() const {
994 return !layout_helper_needs_slow_path(layout_helper());
995 }
996
997 // Java vtable/itable
998 klassVtable* vtable() const; // return new klassVtable wrapper
999 inline Method* method_at_vtable(int index);
1000 klassItable* itable() const; // return new klassItable wrapper
1001 Method* method_at_itable(Klass* holder, int index, TRAPS);
1002
1003 #if INCLUDE_JVMTI
1004 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1005 #endif // INCLUDE_JVMTI
1006
1007 // Garbage collection
1008 void oop_follow_contents(oop obj);
1009 int oop_adjust_pointers(oop obj);
1010
1011 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1012 void clean_implementors_list(BoolObjectClosure* is_alive);
1013 void clean_method_data(BoolObjectClosure* is_alive);
1014 void clean_dependent_nmethods();
1015
1016 // Explicit metaspace deallocation of fields
1017 // For RedefineClasses and class file parsing errors, we need to deallocate
1018 // instanceKlasses and the metadata they point to.
1019 void deallocate_contents(ClassLoaderData* loader_data);
1020 static void deallocate_methods(ClassLoaderData* loader_data,
1021 Array<Method*>* methods);
1022 void static deallocate_interfaces(ClassLoaderData* loader_data,
1023 Klass* super_klass,
1024 Array<Klass*>* local_interfaces,
1025 Array<Klass*>* transitive_interfaces);
1026
1027 // The constant pool is on stack if any of the methods are executing or
1028 // referenced by handles.
1029 bool on_stack() const { return _constants->on_stack(); }
1030
1031 // callbacks for actions during class unloading
1032 static void notify_unload_class(InstanceKlass* ik);
1033 static void release_C_heap_structures(InstanceKlass* ik);
1034
1035 // Parallel Scavenge and Parallel Old
1036 PARALLEL_GC_DECLS
1037
1038 // Naming
1039 const char* signature_name() const;
1040
1041 // Iterators
1042 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
1043 return oop_oop_iterate_v(obj, blk);
1044 }
1045
1046 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
1047 return oop_oop_iterate_v_m(obj, blk, mr);
1048 }
1049
1050 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
1051 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
1052 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
1053 MemRegion mr);
1054
1055 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
1056 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
1057
1058 #if INCLUDE_ALL_GCS
1059 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
1060 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
1061
1062 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1063 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1064 #endif // INCLUDE_ALL_GCS
1065
1066 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1067
1068 public:
1069 void set_in_error_state() {
1070 assert(DumpSharedSpaces, "only call this when dumping archive");
1071 _init_state = initialization_error;
1072 }
1073 bool check_sharing_error_state();
1074
1075 private:
1076 // initialization state
1077 #ifdef ASSERT
1078 void set_init_state(ClassState state);
1079 #else
1080 void set_init_state(ClassState state) { _init_state = (u1)state; }
1081 #endif
1082 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1083 void set_init_thread(Thread *thread) { _init_thread = thread; }
1084
1085 // The RedefineClasses() API can cause new method idnums to be needed
1086 // which will cause the caches to grow. Safety requires different
1087 // cache management logic if the caches can grow instead of just
1088 // going from NULL to non-NULL.
1089 bool idnum_can_increment() const { return has_been_redefined(); }
1090 jmethodID* methods_jmethod_ids_acquire() const
1091 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1092 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1093 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1094
1095 // Lock during initialization
1096 public:
1097 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1098 // Must be one per class and it has to be a VM internal object so java code
1099 // cannot lock it (like the mirror).
1100 // It has to be an object not a Mutex because it's held through java calls.
1101 oop init_lock() const;
1102 private:
1103 void fence_and_clear_init_lock();
1104
1105 // Static methods that are used to implement member methods where an exposed this pointer
1106 // is needed due to possible GCs
1107 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1108 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1109 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1110 static void initialize_super_interfaces (instanceKlassHandle this_oop, TRAPS);
1111 static void eager_initialize_impl (instanceKlassHandle this_oop);
1112 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1113 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1114 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1115 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1116 /* jni_id_for_impl for jfieldID only */
1117 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1118
1119 // Returns the array class for the n'th dimension
1120 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1121
1122 // Returns the array class with this class as element type
1123 Klass* array_klass_impl(bool or_null, TRAPS);
1124
1125 // find a local method (returns NULL if not found)
1126 Method* find_method_impl(Symbol* name, Symbol* signature,
1127 OverpassLookupMode overpass_mode,
1128 StaticLookupMode static_mode,
1129 PrivateLookupMode private_mode) const;
1130 static Method* find_method_impl(Array<Method*>* methods,
1131 Symbol* name, Symbol* signature,
1132 OverpassLookupMode overpass_mode,
1133 StaticLookupMode static_mode,
1134 PrivateLookupMode private_mode);
1135
1136 // Free CHeap allocated fields.
1137 void release_C_heap_structures();
1138
1139 // RedefineClasses support
1140 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1141 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1142 public:
1143 // CDS support - remove and restore oops from metadata. Oops are not shared.
1144 virtual void remove_unshareable_info();
1145 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1146
1147 // jvm support
1148 jint compute_modifier_flags(TRAPS) const;
1149
1150 // JSR-292 support
1151 MemberNameTable* member_names() { return _member_names; }
1152 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1153 oop add_member_name(Handle member_name, bool intern);
1154
1155 public:
1156 // JVMTI support
1157 jint jvmti_class_status() const;
1158
1159 public:
1160 // Printing
1161 #ifndef PRODUCT
1162 void print_on(outputStream* st) const;
1163 #endif
1164 void print_value_on(outputStream* st) const;
1165
1166 void oop_print_value_on(oop obj, outputStream* st);
1167
1168 #ifndef PRODUCT
1169 void oop_print_on (oop obj, outputStream* st);
1170
1171 void print_dependent_nmethods(bool verbose = false);
1172 bool is_dependent_nmethod(nmethod* nm);
1173 #endif
1174
1175 const char* internal_name() const;
1176
1177 // Verification
1178 void verify_on(outputStream* st);
1179
1180 void oop_verify_on(oop obj, outputStream* st);
1181 };
1182
1183 inline Method* InstanceKlass::method_at_vtable(int index) {
1184 #ifndef PRODUCT
1185 assert(index >= 0, "valid vtable index");
1186 if (DebugVtables) {
1187 verify_vtable_index(index);
1188 }
1189 #endif
1190 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1191 return ve[index].method();
1192 }
1193
1194 // for adding methods
1195 // UNSET_IDNUM return means no more ids available
1196 inline u2 InstanceKlass::next_method_idnum() {
1197 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1198 return ConstMethod::UNSET_IDNUM; // no more ids available
1199 } else {
1200 return _idnum_allocated_count++;
1201 }
1202 }
1203
1204
1205 /* JNIid class for jfieldIDs only */
1206 class JNIid: public CHeapObj<mtClass> {
1207 friend class VMStructs;
1208 private:
1209 Klass* _holder;
1210 JNIid* _next;
1211 int _offset;
1212 #ifdef ASSERT
1213 bool _is_static_field_id;
1214 #endif
1215
1216 public:
1217 // Accessors
1218 Klass* holder() const { return _holder; }
1219 int offset() const { return _offset; }
1220 JNIid* next() { return _next; }
1221 // Constructor
1222 JNIid(Klass* holder, int offset, JNIid* next);
1223 // Identifier lookup
1224 JNIid* find(int offset);
1225
1226 bool find_local_field(fieldDescriptor* fd) {
1227 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1228 }
1229
1230 static void deallocate(JNIid* id);
1231 // Debugging
1232 #ifdef ASSERT
1233 bool is_static_field_id() const { return _is_static_field_id; }
1234 void set_is_static_field_id() { _is_static_field_id = true; }
1235 #endif
1236 void verify(Klass* holder);
1237 };
1238
1239
1240 //
1241 // nmethodBucket is used to record dependent nmethods for
1242 // deoptimization. nmethod dependencies are actually <klass, method>
1243 // pairs but we really only care about the klass part for purposes of
1244 // finding nmethods which might need to be deoptimized. Instead of
1245 // recording the method, a count of how many times a particular nmethod
1246 // was recorded is kept. This ensures that any recording errors are
1247 // noticed since an nmethod should be removed as many times are it's
1248 // added.
1249 //
1250 class nmethodBucket: public CHeapObj<mtClass> {
1251 friend class VMStructs;
1252 private:
1253 nmethod* _nmethod;
1254 int _count;
1255 nmethodBucket* _next;
1256
1257 public:
1258 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1259 _nmethod = nmethod;
1260 _next = next;
1261 _count = 1;
1262 }
1263 int count() { return _count; }
1264 int increment() { _count += 1; return _count; }
1265 int decrement();
1266 nmethodBucket* next() { return _next; }
1267 void set_next(nmethodBucket* b) { _next = b; }
1268 nmethod* get_nmethod() { return _nmethod; }
1269 };
1270
1271 // An iterator that's used to access the inner classes indices in the
1272 // InstanceKlass::_inner_classes array.
1273 class InnerClassesIterator : public StackObj {
1274 private:
1275 Array<jushort>* _inner_classes;
1276 int _length;
1277 int _idx;
1278 public:
1279
1280 InnerClassesIterator(instanceKlassHandle k) {
1281 _inner_classes = k->inner_classes();
1282 if (k->inner_classes() != NULL) {
1283 _length = _inner_classes->length();
1284 // The inner class array's length should be the multiple of
1285 // inner_class_next_offset if it only contains the InnerClasses
1286 // attribute data, or it should be
1287 // n*inner_class_next_offset+enclosing_method_attribute_size
1288 // if it also contains the EnclosingMethod data.
1289 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1290 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1291 "just checking");
1292 // Remove the enclosing_method portion if exists.
1293 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1294 _length -= InstanceKlass::enclosing_method_attribute_size;
1295 }
1296 } else {
1297 _length = 0;
1298 }
1299 _idx = 0;
1300 }
1301
1302 int length() const {
1303 return _length;
1304 }
1305
1306 void next() {
1307 _idx += InstanceKlass::inner_class_next_offset;
1308 }
1309
1310 bool done() const {
1311 return (_idx >= _length);
1312 }
1313
1314 u2 inner_class_info_index() const {
1315 return _inner_classes->at(
1316 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1317 }
1318
1319 void set_inner_class_info_index(u2 index) {
1320 _inner_classes->at_put(
1321 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1322 }
1323
1324 u2 outer_class_info_index() const {
1325 return _inner_classes->at(
1326 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1327 }
1328
1329 void set_outer_class_info_index(u2 index) {
1330 _inner_classes->at_put(
1331 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1332 }
1333
1334 u2 inner_name_index() const {
1335 return _inner_classes->at(
1336 _idx + InstanceKlass::inner_class_inner_name_offset);
1337 }
1338
1339 void set_inner_name_index(u2 index) {
1340 _inner_classes->at_put(
1341 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1342 }
1343
1344 u2 inner_access_flags() const {
1345 return _inner_classes->at(
1346 _idx + InstanceKlass::inner_class_access_flags_offset);
1347 }
1348 };
1349
1350 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP