1 /*
2 * Copyright (c) 1997, 2015, 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 "gc/shared/specialized_oop_closures.hpp"
30 #include "memory/referenceType.hpp"
31 #include "oops/annotations.hpp"
32 #include "oops/constMethod.hpp"
33 #include "oops/fieldInfo.hpp"
34 #include "oops/instanceOop.hpp"
35 #include "oops/klassVtable.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "trace/traceMacros.hpp"
39 #include "utilities/accessFlags.hpp"
40 #include "utilities/bitMap.inline.hpp"
41 #include "utilities/macros.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 embedded field layout (after declared fields):
47 // [EMBEDDED Java vtable ] size in words = vtable_len
48 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
49 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
50 // indicating where oops are located in instances of this klass.
51 // [EMBEDDED implementor of the interface] only exist for interface
52 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
53
54
55 // forward declaration for class -- see below for definition
56 class SuperTypeClosure;
57 class JNIid;
58 class jniIdMapBase;
59 class BreakpointInfo;
60 class fieldDescriptor;
61 class DepChange;
62 class nmethodBucket;
63 class JvmtiCachedClassFieldMap;
64 class MemberNameTable;
65
66 // This is used in iterators below.
67 class FieldClosure: public StackObj {
68 public:
69 virtual void do_field(fieldDescriptor* fd) = 0;
70 };
71
72 #ifndef PRODUCT
73 // Print fields.
74 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
75 class FieldPrinter: public FieldClosure {
76 oop _obj;
77 outputStream* _st;
78 public:
79 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
80 void do_field(fieldDescriptor* fd);
81 };
82 #endif // !PRODUCT
83
84 // ValueObjs embedded in klass. Describes where oops are located in instances of
85 // this klass.
86 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
87 public:
88 // Byte offset of the first oop mapped by this block.
89 int offset() const { return _offset; }
90 void set_offset(int offset) { _offset = offset; }
91
92 // Number of oops in this block.
93 uint count() const { return _count; }
94 void set_count(uint count) { _count = count; }
95
96 // sizeof(OopMapBlock) in HeapWords.
97 static const int size_in_words() {
98 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
99 LogHeapWordSize;
100 }
101
102 private:
103 int _offset;
104 uint _count;
105 };
106
107 struct JvmtiCachedClassFileData;
108
109 class InstanceKlass: public Klass {
110 friend class VMStructs;
111 friend class ClassFileParser;
112 friend class CompileReplay;
113
114 protected:
115 // Constructor
116 InstanceKlass(int vtable_len,
117 int itable_len,
118 int static_field_size,
119 int nonstatic_oop_map_size,
120 ReferenceType rt,
121 AccessFlags access_flags,
122 bool is_anonymous);
123 public:
124 static InstanceKlass* allocate_instance_klass(
125 ClassLoaderData* loader_data,
126 int vtable_len,
127 int itable_len,
128 int static_field_size,
129 int nonstatic_oop_map_size,
130 ReferenceType rt,
131 AccessFlags access_flags,
132 Symbol* name,
133 Klass* super_klass,
134 bool is_anonymous,
135 TRAPS);
136
137 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
138
139 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
140 // of the class loading & initialization procedure, and the use of the states.
141 enum ClassState {
142 allocated, // allocated (but not yet linked)
143 loaded, // loaded and inserted in class hierarchy (but not linked yet)
144 linked, // successfully linked/verified (but not initialized yet)
145 being_initialized, // currently running class initializer
146 fully_initialized, // initialized (successfull final state)
147 initialization_error // error happened during initialization
148 };
149
150 static int number_of_instance_classes() { return _total_instanceKlass_count; }
151
152 private:
153 static volatile int _total_instanceKlass_count;
154
155 protected:
156 // Annotations for this class
157 Annotations* _annotations;
158 // Array classes holding elements of this class.
159 Klass* _array_klasses;
160 // Constant pool for this class.
161 ConstantPool* _constants;
162 // The InnerClasses attribute and EnclosingMethod attribute. The
163 // _inner_classes is an array of shorts. If the class has InnerClasses
164 // attribute, then the _inner_classes array begins with 4-tuples of shorts
165 // [inner_class_info_index, outer_class_info_index,
166 // inner_name_index, inner_class_access_flags] for the InnerClasses
167 // attribute. If the EnclosingMethod attribute exists, it occupies the
168 // last two shorts [class_index, method_index] of the array. If only
169 // the InnerClasses attribute exists, the _inner_classes array length is
170 // number_of_inner_classes * 4. If the class has both InnerClasses
171 // and EnclosingMethod attributes the _inner_classes array length is
172 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
173 Array<jushort>* _inner_classes;
174
175 // the source debug extension for this klass, NULL if not specified.
176 // Specified as UTF-8 string without terminating zero byte in the classfile,
177 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
178 char* _source_debug_extension;
179 // Array name derived from this class which needs unreferencing
180 // if this class is unloaded.
181 Symbol* _array_name;
182
183 // Number of heapOopSize words used by non-static fields in this klass
184 // (including inherited fields but after header_size()).
185 int _nonstatic_field_size;
186 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
187 // Constant pool index to the utf8 entry of the Generic signature,
188 // or 0 if none.
189 u2 _generic_signature_index;
190 // Constant pool index to the utf8 entry for the name of source file
191 // containing this klass, 0 if not specified.
192 u2 _source_file_name_index;
193 u2 _static_oop_field_count;// number of static oop fields in this klass
194 u2 _java_fields_count; // The number of declared Java fields
195 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
196
197 // _is_marked_dependent can be set concurrently, thus cannot be part of the
198 // _misc_flags.
199 bool _is_marked_dependent; // used for marking during flushing and deoptimization
200 bool _has_unloaded_dependent;
201
202 enum {
203 _misc_rewritten = 1 << 0, // methods rewritten.
204 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
205 _misc_should_verify_class = 1 << 2, // allow caching of preverification
206 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
207 _misc_is_contended = 1 << 4, // marked with contended annotation
208 _misc_has_default_methods = 1 << 5, // class/superclass/implemented interfaces has default methods
209 _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access)
210 _misc_has_been_redefined = 1 << 7, // class has been redefined
211 _misc_is_scratch_class = 1 << 8 // class is the redefined scratch class
212 };
213 u2 _misc_flags;
214 u2 _minor_version; // minor version number of class file
215 u2 _major_version; // major version number of class file
216 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
217 int _vtable_len; // length of Java vtable (in words)
218 int _itable_len; // length of Java itable (in words)
219 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
220 MemberNameTable* _member_names; // Member names
221 JNIid* _jni_ids; // First JNI identifier for static fields in this class
222 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
223 nmethodBucket* _dependencies; // list of dependent nmethods
224 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
225 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
226 // Linked instanceKlasses of previous versions
227 InstanceKlass* _previous_versions;
228 // JVMTI fields can be moved to their own structure - see 6315920
229 // JVMTI: cached class file, before retransformable agent modified it in CFLH
230 JvmtiCachedClassFileData* _cached_class_file;
231
232 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
233
234 // Class states are defined as ClassState (see above).
235 // Place the _init_state here to utilize the unused 2-byte after
236 // _idnum_allocated_count.
237 u1 _init_state; // state of class
238 u1 _reference_type; // reference type
239
240 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
241
242 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
243
244 // Method array.
245 Array<Method*>* _methods;
246 // Default Method Array, concrete methods inherited from interfaces
247 Array<Method*>* _default_methods;
248 // Interface (Klass*s) this class declares locally to implement.
249 Array<Klass*>* _local_interfaces;
250 // Interface (Klass*s) this class implements transitively.
251 Array<Klass*>* _transitive_interfaces;
252 // Int array containing the original order of method in the class file (for JVMTI).
253 Array<int>* _method_ordering;
254 // Int array containing the vtable_indices for default_methods
255 // offset matches _default_methods offset
256 Array<int>* _default_vtable_indices;
257
258 // Instance and static variable information, starts with 6-tuples of shorts
259 // [access, name index, sig index, initval index, low_offset, high_offset]
260 // for all fields, followed by the generic signature data at the end of
261 // the array. Only fields with generic signature attributes have the generic
262 // signature data set in the array. The fields array looks like following:
263 //
264 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
265 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
266 // ...
267 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
268 // [generic signature index]
269 // [generic signature index]
270 // ...
271 Array<u2>* _fields;
272
273 // embedded Java vtable follows here
274 // embedded Java itables follows here
275 // embedded static fields follows here
276 // embedded nonstatic oop-map blocks follows here
277 // embedded implementor of this interface follows here
278 // The embedded implementor only exists if the current klass is an
279 // iterface. The possible values of the implementor fall into following
280 // three cases:
281 // NULL: no implementor.
282 // A Klass* that's not itself: one implementor.
283 // Itself: more than one implementors.
284 // embedded host klass follows here
285 // The embedded host klass only exists in an anonymous class for
286 // dynamic language support (JSR 292 enabled). The host class grants
287 // its access privileges to this class also. The host class is either
288 // named, or a previously loaded anonymous class. A non-anonymous class
289 // or an anonymous class loaded through normal classloading does not
290 // have this embedded field.
291 //
292
293 // TODO
294 bool _set_finals;
295
296 friend class SystemDictionary;
297
298 public:
299 bool set_finals() { return _set_finals; }
300 void set_finals(bool b) { _set_finals = b; }
301
302 bool has_nonstatic_fields() const {
303 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
304 }
305 void set_has_nonstatic_fields(bool b) {
306 if (b) {
307 _misc_flags |= _misc_has_nonstatic_fields;
308 } else {
309 _misc_flags &= ~_misc_has_nonstatic_fields;
310 }
311 }
312
313 // field sizes
314 int nonstatic_field_size() const { return _nonstatic_field_size; }
315 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
316
317 int static_field_size() const { return _static_field_size; }
318 void set_static_field_size(int size) { _static_field_size = size; }
319
320 int static_oop_field_count() const { return (int)_static_oop_field_count; }
321 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
322
323 // Java vtable
324 int vtable_length() const { return _vtable_len; }
325 void set_vtable_length(int len) { _vtable_len = len; }
326
327 // Java itable
328 int itable_length() const { return _itable_len; }
329 void set_itable_length(int len) { _itable_len = len; }
330
331 // array klasses
332 Klass* array_klasses() const { return _array_klasses; }
333 void set_array_klasses(Klass* k) { _array_klasses = k; }
334
335 // methods
336 Array<Method*>* methods() const { return _methods; }
337 void set_methods(Array<Method*>* a) { _methods = a; }
338 Method* method_with_idnum(int idnum);
339 Method* method_with_orig_idnum(int idnum);
340 Method* method_with_orig_idnum(int idnum, int version);
341
342 // method ordering
343 Array<int>* method_ordering() const { return _method_ordering; }
344 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
345 void copy_method_ordering(intArray* m, TRAPS);
346
347 // default_methods
348 Array<Method*>* default_methods() const { return _default_methods; }
349 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
350
351 // default method vtable_indices
352 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
353 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
354 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
355
356 // interfaces
357 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
358 void set_local_interfaces(Array<Klass*>* a) {
359 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
360 _local_interfaces = a; }
361
362 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
363 void set_transitive_interfaces(Array<Klass*>* a) {
364 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
365 _transitive_interfaces = a;
366 }
367
368 private:
369 friend class fieldDescriptor;
370 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
371
372 public:
373 int field_offset (int index) const { return field(index)->offset(); }
374 int field_access_flags(int index) const { return field(index)->access_flags(); }
375 Symbol* field_name (int index) const { return field(index)->name(constants()); }
376 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
377
378 // Number of Java declared fields
379 int java_fields_count() const { return (int)_java_fields_count; }
380
381 Array<u2>* fields() const { return _fields; }
382 void set_fields(Array<u2>* f, u2 java_fields_count) {
383 guarantee(_fields == NULL || f == NULL, "Just checking");
384 _fields = f;
385 _java_fields_count = java_fields_count;
386 }
387
388 // inner classes
389 Array<u2>* inner_classes() const { return _inner_classes; }
390 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
391
392 enum InnerClassAttributeOffset {
393 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
394 inner_class_inner_class_info_offset = 0,
395 inner_class_outer_class_info_offset = 1,
396 inner_class_inner_name_offset = 2,
397 inner_class_access_flags_offset = 3,
398 inner_class_next_offset = 4
399 };
400
401 enum EnclosingMethodAttributeOffset {
402 enclosing_method_class_index_offset = 0,
403 enclosing_method_method_index_offset = 1,
404 enclosing_method_attribute_size = 2
405 };
406
407 // method override check
408 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
409
410 // package
411 bool is_same_class_package(Klass* class2);
412 bool is_same_class_package(oop classloader2, Symbol* classname2);
413 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
414
415 // find an enclosing class
416 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
417 instanceKlassHandle self(THREAD, this);
418 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
419 }
420 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
421 bool* inner_is_member, TRAPS);
422
423 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
424 static bool find_inner_classes_attr(instanceKlassHandle k,
425 int* ooff, int* noff, TRAPS);
426
427 // tell if two classes have the same enclosing class (at package level)
428 bool is_same_package_member(Klass* class2, TRAPS) {
429 instanceKlassHandle self(THREAD, this);
430 return is_same_package_member_impl(self, class2, THREAD);
431 }
432 static bool is_same_package_member_impl(instanceKlassHandle self,
433 Klass* class2, TRAPS);
434
435 // initialization state
436 bool is_loaded() const { return _init_state >= loaded; }
437 bool is_linked() const { return _init_state >= linked; }
438 bool is_initialized() const { return _init_state == fully_initialized; }
439 bool is_not_initialized() const { return _init_state < being_initialized; }
440 bool is_being_initialized() const { return _init_state == being_initialized; }
441 bool is_in_error_state() const { return _init_state == initialization_error; }
442 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
443 ClassState init_state() { return (ClassState)_init_state; }
444 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
445
446 // defineClass specified verification
447 bool should_verify_class() const {
448 return (_misc_flags & _misc_should_verify_class) != 0;
449 }
450 void set_should_verify_class(bool value) {
451 if (value) {
452 _misc_flags |= _misc_should_verify_class;
453 } else {
454 _misc_flags &= ~_misc_should_verify_class;
455 }
456 }
457
458 // marking
459 bool is_marked_dependent() const { return _is_marked_dependent; }
460 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
461
462 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
463 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
464
465 // initialization (virtuals from Klass)
466 bool should_be_initialized() const; // means that initialize should be called
467 void initialize(TRAPS);
468 void link_class(TRAPS);
469 bool link_class_or_fail(TRAPS); // returns false on failure
470 void unlink_class();
471 void rewrite_class(TRAPS);
472 void link_methods(TRAPS);
473 Method* class_initializer();
474
475 // set the class to initialized if no static initializer is present
476 void eager_initialize(Thread *thread);
477
478 // reference type
479 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
480 void set_reference_type(ReferenceType t) {
481 assert(t == (u1)t, "overflow");
482 _reference_type = (u1)t;
483 }
484
485 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
486
487 // find local field, returns true if found
488 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
489 // find field in direct superinterfaces, returns the interface in which the field is defined
490 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
491 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
492 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
493 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
494 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
495
496 // find a non-static or static field given its offset within the class.
497 bool contains_field_offset(int offset) {
498 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
499 }
500
501 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
502 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
503
504 // find a local method (returns NULL if not found)
505 Method* find_method(Symbol* name, Symbol* signature) const;
506 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
507
508 // find a local method, but skip static methods
509 Method* find_instance_method(Symbol* name, Symbol* signature);
510 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
511
512 // true if method matches signature and conforms to skipping_X conditions.
513 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static);
514
515 // find a local method index in default_methods (returns -1 if not found)
516 static int find_method_index(Array<Method*>* methods, Symbol* name, Symbol* signature,
517 OverpassLookupMode overpass_mode, StaticLookupMode static_mode);
518
519 // lookup operation (returns NULL if not found)
520 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
521
522 // lookup a method in all the interfaces that this class implements
523 // (returns NULL if not found)
524 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
525
526 // lookup a method in local defaults then in all interfaces
527 // (returns NULL if not found)
528 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
529
530 // Find method indices by name. If a method with the specified name is
531 // found the index to the first method is returned, and 'end' is filled in
532 // with the index of first non-name-matching method. If no method is found
533 // -1 is returned.
534 int find_method_by_name(Symbol* name, int* end);
535 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
536
537 // constant pool
538 ConstantPool* constants() const { return _constants; }
539 void set_constants(ConstantPool* c) { _constants = c; }
540
541 // protection domain
542 oop protection_domain() const;
543
544 // signers
545 objArrayOop signers() const;
546
547 // host class
548 Klass* host_klass() const {
549 Klass** hk = (Klass**)adr_host_klass();
550 if (hk == NULL) {
551 return NULL;
552 } else {
553 assert(*hk != NULL, "host klass should always be set if the address is not null");
554 return *hk;
555 }
556 }
557 void set_host_klass(Klass* host) {
558 assert(is_anonymous(), "not anonymous");
559 Klass** addr = (Klass**)adr_host_klass();
560 assert(addr != NULL, "no reversed space");
561 if (addr != NULL) {
562 *addr = host;
563 }
564 }
565 bool is_anonymous() const {
566 return (_misc_flags & _misc_is_anonymous) != 0;
567 }
568 void set_is_anonymous(bool value) {
569 if (value) {
570 _misc_flags |= _misc_is_anonymous;
571 } else {
572 _misc_flags &= ~_misc_is_anonymous;
573 }
574 }
575
576 // Oop that keeps the metadata for this class from being unloaded
577 // in places where the metadata is stored in other places, like nmethods
578 oop klass_holder() const {
579 return is_anonymous() ? java_mirror() : class_loader();
580 }
581
582 bool is_contended() const {
583 return (_misc_flags & _misc_is_contended) != 0;
584 }
585 void set_is_contended(bool value) {
586 if (value) {
587 _misc_flags |= _misc_is_contended;
588 } else {
589 _misc_flags &= ~_misc_is_contended;
590 }
591 }
592
593 // source file name
594 Symbol* source_file_name() const {
595 return (_source_file_name_index == 0) ?
596 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
597 }
598 u2 source_file_name_index() const {
599 return _source_file_name_index;
600 }
601 void set_source_file_name_index(u2 sourcefile_index) {
602 _source_file_name_index = sourcefile_index;
603 }
604
605 // minor and major version numbers of class file
606 u2 minor_version() const { return _minor_version; }
607 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
608 u2 major_version() const { return _major_version; }
609 void set_major_version(u2 major_version) { _major_version = major_version; }
610
611 // source debug extension
612 char* source_debug_extension() const { return _source_debug_extension; }
613 void set_source_debug_extension(char* array, int length);
614
615 // symbol unloading support (refcount already added)
616 Symbol* array_name() { return _array_name; }
617 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
618
619 // nonstatic oop-map blocks
620 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
621 return oop_map_count * OopMapBlock::size_in_words();
622 }
623 unsigned int nonstatic_oop_map_count() const {
624 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
625 }
626 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
627 void set_nonstatic_oop_map_size(int words) {
628 _nonstatic_oop_map_size = words;
629 }
630
631 // RedefineClasses() support for previous versions:
632 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
633
634 InstanceKlass* previous_versions() const { return _previous_versions; }
635
636 InstanceKlass* get_klass_version(int version) {
637 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
638 if (ik->constants()->version() == version) {
639 return ik;
640 }
641 }
642 return NULL;
643 }
644
645 bool has_been_redefined() const {
646 return (_misc_flags & _misc_has_been_redefined) != 0;
647 }
648 void set_has_been_redefined() {
649 _misc_flags |= _misc_has_been_redefined;
650 }
651
652 bool is_scratch_class() const {
653 return (_misc_flags & _misc_is_scratch_class) != 0;
654 }
655
656 void set_is_scratch_class() {
657 _misc_flags |= _misc_is_scratch_class;
658 }
659
660 void init_previous_versions() {
661 _previous_versions = NULL;
662 }
663
664 private:
665 static int _previous_version_count;
666 public:
667 static void purge_previous_versions(InstanceKlass* ik);
668 static bool has_previous_versions() { return _previous_version_count > 0; }
669
670 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
671 void set_cached_class_file(JvmtiCachedClassFileData *data) {
672 _cached_class_file = data;
673 }
674 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
675 jint get_cached_class_file_len();
676 unsigned char * get_cached_class_file_bytes();
677
678 // JVMTI: Support for caching of field indices, types, and offsets
679 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
680 _jvmti_cached_class_field_map = descriptor;
681 }
682 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
683 return _jvmti_cached_class_field_map;
684 }
685
686 bool has_default_methods() const {
687 return (_misc_flags & _misc_has_default_methods) != 0;
688 }
689 void set_has_default_methods(bool b) {
690 if (b) {
691 _misc_flags |= _misc_has_default_methods;
692 } else {
693 _misc_flags &= ~_misc_has_default_methods;
694 }
695 }
696
697 bool declares_default_methods() const {
698 return (_misc_flags & _misc_declares_default_methods) != 0;
699 }
700 void set_declares_default_methods(bool b) {
701 if (b) {
702 _misc_flags |= _misc_declares_default_methods;
703 } else {
704 _misc_flags &= ~_misc_declares_default_methods;
705 }
706 }
707
708 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
709 inline u2 next_method_idnum();
710 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
711
712 // generics support
713 Symbol* generic_signature() const {
714 return (_generic_signature_index == 0) ?
715 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
716 }
717 u2 generic_signature_index() const {
718 return _generic_signature_index;
719 }
720 void set_generic_signature_index(u2 sig_index) {
721 _generic_signature_index = sig_index;
722 }
723
724 u2 enclosing_method_data(int offset);
725 u2 enclosing_method_class_index() {
726 return enclosing_method_data(enclosing_method_class_index_offset);
727 }
728 u2 enclosing_method_method_index() {
729 return enclosing_method_data(enclosing_method_method_index_offset);
730 }
731 void set_enclosing_method_indices(u2 class_index,
732 u2 method_index);
733
734 // jmethodID support
735 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
736 methodHandle method_h);
737 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
738 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
739 jmethodID* to_dealloc_id_p,
740 jmethodID** to_dealloc_jmeths_p);
741 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
742 size_t *length_p, jmethodID* id_p);
743 void ensure_space_for_methodids(int start_offset = 0);
744 jmethodID jmethod_id_or_null(Method* method);
745
746 // annotations support
747 Annotations* annotations() const { return _annotations; }
748 void set_annotations(Annotations* anno) { _annotations = anno; }
749
750 AnnotationArray* class_annotations() const {
751 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
752 }
753 Array<AnnotationArray*>* fields_annotations() const {
754 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
755 }
756 AnnotationArray* class_type_annotations() const {
757 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
758 }
759 Array<AnnotationArray*>* fields_type_annotations() const {
760 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
761 }
762 // allocation
763 instanceOop allocate_instance(TRAPS);
764
765 // additional member function to return a handle
766 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
767
768 objArrayOop allocate_objArray(int n, int length, TRAPS);
769 // Helper function
770 static instanceOop register_finalizer(instanceOop i, TRAPS);
771
772 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
773 // if not, throw either an Error or an Exception.
774 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
775
776 // initialization
777 void call_class_initializer(TRAPS);
778 void set_initialization_state_and_notify(ClassState state, TRAPS);
779
780 // OopMapCache support
781 OopMapCache* oop_map_cache() { return _oop_map_cache; }
782 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
783 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
784
785 // JNI identifier support (for static fields - for jni performance)
786 JNIid* jni_ids() { return _jni_ids; }
787 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
788 JNIid* jni_id_for(int offset);
789
790 // maintenance of deoptimization dependencies
791 int mark_dependent_nmethods(DepChange& changes);
792 void add_dependent_nmethod(nmethod* nm);
793 void remove_dependent_nmethod(nmethod* nm);
794
795 // On-stack replacement support
796 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
797 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
798 void add_osr_nmethod(nmethod* n);
799 void remove_osr_nmethod(nmethod* n);
800 int mark_osr_nmethods(const Method* m);
801 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
802
803 // Breakpoint support (see methods on Method* for details)
804 BreakpointInfo* breakpoints() const { return _breakpoints; };
805 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
806
807 // support for stub routines
808 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
809 TRACE_DEFINE_OFFSET;
810 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
811
812 // subclass/subinterface checks
813 bool implements_interface(Klass* k) const;
814 bool is_same_or_direct_interface(Klass* k) const;
815
816 #ifdef ASSERT
817 // check whether this class or one of its superclasses was redefined
818 bool has_redefined_this_or_super() const;
819 #endif
820
821 // Access to the implementor of an interface.
822 Klass* implementor() const
823 {
824 Klass** k = adr_implementor();
825 if (k == NULL) {
826 return NULL;
827 } else {
828 return *k;
829 }
830 }
831
832 void set_implementor(Klass* k) {
833 assert(is_interface(), "not interface");
834 Klass** addr = adr_implementor();
835 assert(addr != NULL, "null addr");
836 if (addr != NULL) {
837 *addr = k;
838 }
839 }
840
841 int nof_implementors() const {
842 Klass* k = implementor();
843 if (k == NULL) {
844 return 0;
845 } else if (k != this) {
846 return 1;
847 } else {
848 return 2;
849 }
850 }
851
852 void add_implementor(Klass* k); // k is a new class that implements this interface
853 void init_implementor(); // initialize
854
855 // link this class into the implementors list of every interface it implements
856 void process_interfaces(Thread *thread);
857
858 // virtual operations from Klass
859 bool is_leaf_class() const { return _subklass == NULL; }
860 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
861 bool compute_is_subtype_of(Klass* k);
862 bool can_be_primary_super_slow() const;
863 int oop_size(oop obj) const { return size_helper(); }
864 bool oop_is_instance_slow() const { return true; }
865
866 // Iterators
867 void do_local_static_fields(FieldClosure* cl);
868 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
869 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
870
871 void methods_do(void f(Method* method));
872 void array_klasses_do(void f(Klass* k));
873 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
874 bool super_types_do(SuperTypeClosure* blk);
875
876 // Casting from Klass*
877 static InstanceKlass* cast(Klass* k) {
878 assert(k == NULL || k->is_klass(), "must be");
879 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
880 return (InstanceKlass*) k;
881 }
882
883 InstanceKlass* java_super() const {
884 return (super() == NULL) ? NULL : cast(super());
885 }
886
887 // Sizing (in words)
888 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
889
890 static int size(int vtable_length, int itable_length,
891 int nonstatic_oop_map_size,
892 bool is_interface, bool is_anonymous) {
893 return align_object_size(header_size() +
894 align_object_offset(vtable_length) +
895 align_object_offset(itable_length) +
896 ((is_interface || is_anonymous) ?
897 align_object_offset(nonstatic_oop_map_size) :
898 nonstatic_oop_map_size) +
899 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
900 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
901 }
902 int size() const { return size(vtable_length(),
903 itable_length(),
904 nonstatic_oop_map_size(),
905 is_interface(),
906 is_anonymous());
907 }
908 #if INCLUDE_SERVICES
909 virtual void collect_statistics(KlassSizeStats *sz) const;
910 #endif
911
912 static int vtable_start_offset() { return header_size(); }
913 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
914
915 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
916 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
917 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
918
919 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
920
921 address static_field_addr(int offset);
922
923 OopMapBlock* start_of_nonstatic_oop_maps() const {
924 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
925 }
926
927 Klass** end_of_nonstatic_oop_maps() const {
928 return (Klass**)(start_of_nonstatic_oop_maps() +
929 nonstatic_oop_map_count());
930 }
931
932 Klass** adr_implementor() const {
933 if (is_interface()) {
934 return (Klass**)end_of_nonstatic_oop_maps();
935 } else {
936 return NULL;
937 }
938 };
939
940 Klass** adr_host_klass() const {
941 if (is_anonymous()) {
942 Klass** adr_impl = adr_implementor();
943 if (adr_impl != NULL) {
944 return adr_impl + 1;
945 } else {
946 return end_of_nonstatic_oop_maps();
947 }
948 } else {
949 return NULL;
950 }
951 }
952
953 // Use this to return the size of an instance in heap words:
954 int size_helper() const {
955 return layout_helper_to_size_helper(layout_helper());
956 }
957
958 // This bit is initialized in classFileParser.cpp.
959 // It is false under any of the following conditions:
960 // - the class is abstract (including any interface)
961 // - the class has a finalizer (if !RegisterFinalizersAtInit)
962 // - the class size is larger than FastAllocateSizeLimit
963 // - the class is java/lang/Class, which cannot be allocated directly
964 bool can_be_fastpath_allocated() const {
965 return !layout_helper_needs_slow_path(layout_helper());
966 }
967
968 // Java vtable/itable
969 klassVtable* vtable() const; // return new klassVtable wrapper
970 inline Method* method_at_vtable(int index);
971 klassItable* itable() const; // return new klassItable wrapper
972 Method* method_at_itable(Klass* holder, int index, TRAPS);
973
974 #if INCLUDE_JVMTI
975 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
976 #endif // INCLUDE_JVMTI
977
978 void clean_implementors_list(BoolObjectClosure* is_alive);
979 void clean_method_data(BoolObjectClosure* is_alive);
980 void clean_dependent_nmethods();
981
982 // Explicit metaspace deallocation of fields
983 // For RedefineClasses and class file parsing errors, we need to deallocate
984 // instanceKlasses and the metadata they point to.
985 void deallocate_contents(ClassLoaderData* loader_data);
986 static void deallocate_methods(ClassLoaderData* loader_data,
987 Array<Method*>* methods);
988 void static deallocate_interfaces(ClassLoaderData* loader_data,
989 Klass* super_klass,
990 Array<Klass*>* local_interfaces,
991 Array<Klass*>* transitive_interfaces);
992
993 // The constant pool is on stack if any of the methods are executing or
994 // referenced by handles.
995 bool on_stack() const { return _constants->on_stack(); }
996
997 // callbacks for actions during class unloading
998 static void notify_unload_class(InstanceKlass* ik);
999 static void release_C_heap_structures(InstanceKlass* ik);
1000
1001 // Naming
1002 const char* signature_name() const;
1003
1004 // GC specific object visitors
1005 //
1006 // Mark Sweep
1007 void oop_ms_follow_contents(oop obj);
1008 int oop_ms_adjust_pointers(oop obj);
1009 #if INCLUDE_ALL_GCS
1010 // Parallel Scavenge
1011 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1012 // Parallel Compact
1013 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1014 void oop_pc_update_pointers(oop obj);
1015 #endif
1016
1017 // Oop fields (and metadata) iterators
1018 // [nv = true] Use non-virtual calls to do_oop_nv.
1019 // [nv = false] Use virtual calls to do_oop.
1020 //
1021 // The InstanceKlass iterators also visits the Object's klass.
1022
1023 // Forward iteration
1024 public:
1025 // Iterate over all oop fields in the oop maps.
1026 template <bool nv, class OopClosureType>
1027 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1028
1029 protected:
1030 // Iterate over all oop fields and metadata.
1031 template <bool nv, class OopClosureType>
1032 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1033
1034 private:
1035 // Iterate over all oop fields in the oop maps.
1036 // Specialized for [T = oop] or [T = narrowOop].
1037 template <bool nv, typename T, class OopClosureType>
1038 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1039
1040 // Iterate over all oop fields in one oop map.
1041 template <bool nv, typename T, class OopClosureType>
1042 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1043
1044
1045 // Reverse iteration
1046 #if INCLUDE_ALL_GCS
1047 public:
1048 // Iterate over all oop fields in the oop maps.
1049 template <bool nv, class OopClosureType>
1050 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1051
1052 protected:
1053 // Iterate over all oop fields and metadata.
1054 template <bool nv, class OopClosureType>
1055 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1056
1057 private:
1058 // Iterate over all oop fields in the oop maps.
1059 // Specialized for [T = oop] or [T = narrowOop].
1060 template <bool nv, typename T, class OopClosureType>
1061 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1062
1063 // Iterate over all oop fields in one oop map.
1064 template <bool nv, typename T, class OopClosureType>
1065 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1066 #endif
1067
1068
1069 // Bounded range iteration
1070 public:
1071 // Iterate over all oop fields in the oop maps.
1072 template <bool nv, class OopClosureType>
1073 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1074
1075 protected:
1076 // Iterate over all oop fields and metadata.
1077 template <bool nv, class OopClosureType>
1078 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1079
1080 private:
1081 // Iterate over all oop fields in the oop maps.
1082 // Specialized for [T = oop] or [T = narrowOop].
1083 template <bool nv, typename T, class OopClosureType>
1084 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1085
1086 // Iterate over all oop fields in one oop map.
1087 template <bool nv, typename T, class OopClosureType>
1088 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1089
1090
1091 public:
1092
1093 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1094 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1095
1096 #if INCLUDE_ALL_GCS
1097 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1098 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1099 #endif // INCLUDE_ALL_GCS
1100
1101 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1102
1103 public:
1104 void set_in_error_state() {
1105 assert(DumpSharedSpaces, "only call this when dumping archive");
1106 _init_state = initialization_error;
1107 }
1108 bool check_sharing_error_state();
1109
1110 private:
1111 // initialization state
1112 #ifdef ASSERT
1113 void set_init_state(ClassState state);
1114 #else
1115 void set_init_state(ClassState state) { _init_state = (u1)state; }
1116 #endif
1117 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1118 void set_init_thread(Thread *thread) { _init_thread = thread; }
1119
1120 // The RedefineClasses() API can cause new method idnums to be needed
1121 // which will cause the caches to grow. Safety requires different
1122 // cache management logic if the caches can grow instead of just
1123 // going from NULL to non-NULL.
1124 bool idnum_can_increment() const { return has_been_redefined(); }
1125 jmethodID* methods_jmethod_ids_acquire() const
1126 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1127 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1128 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1129
1130 // Lock during initialization
1131 public:
1132 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1133 // Must be one per class and it has to be a VM internal object so java code
1134 // cannot lock it (like the mirror).
1135 // It has to be an object not a Mutex because it's held through java calls.
1136 oop init_lock() const;
1137 private:
1138 void fence_and_clear_init_lock();
1139
1140 // Static methods that are used to implement member methods where an exposed this pointer
1141 // is needed due to possible GCs
1142 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1143 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1144 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1145 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1146 static void eager_initialize_impl (instanceKlassHandle this_k);
1147 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1148 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1149 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1150 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1151 /* jni_id_for_impl for jfieldID only */
1152 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1153
1154 // Returns the array class for the n'th dimension
1155 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1156
1157 // Returns the array class with this class as element type
1158 Klass* array_klass_impl(bool or_null, TRAPS);
1159
1160 // find a local method (returns NULL if not found)
1161 Method* find_method_impl(Symbol* name, Symbol* signature,
1162 OverpassLookupMode overpass_mode, StaticLookupMode static_mode) const;
1163 static Method* find_method_impl(Array<Method*>* methods, Symbol* name, Symbol* signature,
1164 OverpassLookupMode overpass_mode, StaticLookupMode static_mode);
1165
1166 // Free CHeap allocated fields.
1167 void release_C_heap_structures();
1168
1169 // RedefineClasses support
1170 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1171 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1172 public:
1173 // CDS support - remove and restore oops from metadata. Oops are not shared.
1174 virtual void remove_unshareable_info();
1175 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1176
1177 // jvm support
1178 jint compute_modifier_flags(TRAPS) const;
1179
1180 // JSR-292 support
1181 MemberNameTable* member_names() { return _member_names; }
1182 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1183 bool add_member_name(Handle member_name);
1184
1185 public:
1186 // JVMTI support
1187 jint jvmti_class_status() const;
1188
1189 public:
1190 // Printing
1191 #ifndef PRODUCT
1192 void print_on(outputStream* st) const;
1193 #endif
1194 void print_value_on(outputStream* st) const;
1195
1196 void oop_print_value_on(oop obj, outputStream* st);
1197
1198 #ifndef PRODUCT
1199 void oop_print_on (oop obj, outputStream* st);
1200
1201 void print_dependent_nmethods(bool verbose = false);
1202 bool is_dependent_nmethod(nmethod* nm);
1203 #endif
1204
1205 const char* internal_name() const;
1206
1207 // Verification
1208 void verify_on(outputStream* st);
1209
1210 void oop_verify_on(oop obj, outputStream* st);
1211 };
1212
1213 inline Method* InstanceKlass::method_at_vtable(int index) {
1214 #ifndef PRODUCT
1215 assert(index >= 0, "valid vtable index");
1216 if (DebugVtables) {
1217 verify_vtable_index(index);
1218 }
1219 #endif
1220 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1221 return ve[index].method();
1222 }
1223
1224 // for adding methods
1225 // UNSET_IDNUM return means no more ids available
1226 inline u2 InstanceKlass::next_method_idnum() {
1227 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1228 return ConstMethod::UNSET_IDNUM; // no more ids available
1229 } else {
1230 return _idnum_allocated_count++;
1231 }
1232 }
1233
1234
1235 /* JNIid class for jfieldIDs only */
1236 class JNIid: public CHeapObj<mtClass> {
1237 friend class VMStructs;
1238 private:
1239 Klass* _holder;
1240 JNIid* _next;
1241 int _offset;
1242 #ifdef ASSERT
1243 bool _is_static_field_id;
1244 #endif
1245
1246 public:
1247 // Accessors
1248 Klass* holder() const { return _holder; }
1249 int offset() const { return _offset; }
1250 JNIid* next() { return _next; }
1251 // Constructor
1252 JNIid(Klass* holder, int offset, JNIid* next);
1253 // Identifier lookup
1254 JNIid* find(int offset);
1255
1256 bool find_local_field(fieldDescriptor* fd) {
1257 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1258 }
1259
1260 static void deallocate(JNIid* id);
1261 // Debugging
1262 #ifdef ASSERT
1263 bool is_static_field_id() const { return _is_static_field_id; }
1264 void set_is_static_field_id() { _is_static_field_id = true; }
1265 #endif
1266 void verify(Klass* holder);
1267 };
1268
1269 class nmethodBucketEntry : public CHeapObj<mtClass> {
1270 friend class VMStructs;
1271 private:
1272 nmethod* _nmethod;
1273 int _count;
1274 nmethodBucketEntry* _next;
1275 public:
1276 nmethodBucketEntry(nmethod* nmethod, nmethodBucketEntry* next) {
1277 _nmethod = nmethod;
1278 _next = next;
1279 _count = 1;
1280 }
1281 int count() { return _count; }
1282 int increment() { _count += 1; return _count; }
1283 int decrement();
1284 nmethodBucketEntry* next() { return _next; }
1285 void set_next(nmethodBucketEntry* b) { _next = b; }
1286 nmethod* get_nmethod() { return _nmethod; }
1287
1288 static int mark_dependent_nmethods(nmethodBucketEntry* deps, DepChange& changes);
1289 static nmethodBucketEntry* add_dependent_nmethod(nmethodBucketEntry* deps, nmethod* nm);
1290 static bool remove_dependent_nmethod(nmethodBucketEntry* deps, nmethod* nm, bool& found);
1291 static nmethodBucketEntry* clean_dependent_nmethods(nmethodBucketEntry* deps);
1292
1293 #ifndef PRODUCT
1294 static void verify(nmethodBucketEntry* deps);
1295 static void print_dependent_nmethods(nmethodBucketEntry* deps, bool verbose);
1296 static bool is_dependent_nmethod(nmethodBucketEntry* deps, nmethod* nm);
1297 #endif //PRODUCT
1298 };
1299
1300 //
1301 // nmethodBucket is used to record dependent nmethods for
1302 // deoptimization. nmethod dependencies are actually <klass, method>
1303 // pairs but we really only care about the klass part for purposes of
1304 // finding nmethods which might need to be deoptimized. Instead of
1305 // recording the method, a count of how many times a particular nmethod
1306 // was recorded is kept. This ensures that any recording errors are
1307 // noticed since an nmethod should be removed as many times are it's
1308 // added.
1309 //
1310 class nmethodBucket: public CHeapObj<mtClass> {
1311 friend class VMStructs;
1312 private:
1313 enum {
1314 FIRST_Bucket = 0,
1315 KlassBucket = FIRST_Bucket,
1316 CallSiteBucket,
1317 ConstantFieldBucket,
1318 Bucket_LIMIT
1319 };
1320
1321 nmethodBucketEntry* _buckets[Bucket_LIMIT];
1322
1323 nmethodBucket() {
1324 for (int i = FIRST_Bucket; i < Bucket_LIMIT; i++) {
1325 _buckets[i] = NULL;
1326 }
1327 }
1328 static int bucket_index(DepChange& changes);
1329
1330 public:
1331
1332 static int mark_dependent_nmethods(nmethodBucket* deps, DepChange& changes);
1333 static nmethodBucket* add_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1334 static bool remove_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1335 static nmethodBucket* clean_dependent_nmethods(nmethodBucket* deps);
1336 static int release(nmethodBucket* deps);
1337 #ifndef PRODUCT
1338 static void verify(nmethodBucket* deps);
1339 static void print_dependent_nmethods(nmethodBucket* deps, bool verbose);
1340 static bool is_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1341 #endif //PRODUCT
1342 };
1343
1344 // An iterator that's used to access the inner classes indices in the
1345 // InstanceKlass::_inner_classes array.
1346 class InnerClassesIterator : public StackObj {
1347 private:
1348 Array<jushort>* _inner_classes;
1349 int _length;
1350 int _idx;
1351 public:
1352
1353 InnerClassesIterator(instanceKlassHandle k) {
1354 _inner_classes = k->inner_classes();
1355 if (k->inner_classes() != NULL) {
1356 _length = _inner_classes->length();
1357 // The inner class array's length should be the multiple of
1358 // inner_class_next_offset if it only contains the InnerClasses
1359 // attribute data, or it should be
1360 // n*inner_class_next_offset+enclosing_method_attribute_size
1361 // if it also contains the EnclosingMethod data.
1362 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1363 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1364 "just checking");
1365 // Remove the enclosing_method portion if exists.
1366 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1367 _length -= InstanceKlass::enclosing_method_attribute_size;
1368 }
1369 } else {
1370 _length = 0;
1371 }
1372 _idx = 0;
1373 }
1374
1375 int length() const {
1376 return _length;
1377 }
1378
1379 void next() {
1380 _idx += InstanceKlass::inner_class_next_offset;
1381 }
1382
1383 bool done() const {
1384 return (_idx >= _length);
1385 }
1386
1387 u2 inner_class_info_index() const {
1388 return _inner_classes->at(
1389 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1390 }
1391
1392 void set_inner_class_info_index(u2 index) {
1393 _inner_classes->at_put(
1394 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1395 }
1396
1397 u2 outer_class_info_index() const {
1398 return _inner_classes->at(
1399 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1400 }
1401
1402 void set_outer_class_info_index(u2 index) {
1403 _inner_classes->at_put(
1404 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1405 }
1406
1407 u2 inner_name_index() const {
1408 return _inner_classes->at(
1409 _idx + InstanceKlass::inner_class_inner_name_offset);
1410 }
1411
1412 void set_inner_name_index(u2 index) {
1413 _inner_classes->at_put(
1414 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1415 }
1416
1417 u2 inner_access_flags() const {
1418 return _inner_classes->at(
1419 _idx + InstanceKlass::inner_class_access_flags_offset);
1420 }
1421 };
1422
1423 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP