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 unsigned kind,
121 ReferenceType rt,
122 AccessFlags access_flags,
123 bool is_anonymous);
124 public:
125 static InstanceKlass* allocate_instance_klass(
126 ClassLoaderData* loader_data,
127 int vtable_len,
128 int itable_len,
129 int static_field_size,
130 int nonstatic_oop_map_size,
131 ReferenceType rt,
132 AccessFlags access_flags,
133 Symbol* name,
134 Klass* super_klass,
135 bool is_anonymous,
136 TRAPS);
137
138 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
139
140 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
141 // of the class loading & initialization procedure, and the use of the states.
142 enum ClassState {
143 allocated, // allocated (but not yet linked)
144 loaded, // loaded and inserted in class hierarchy (but not linked yet)
145 linked, // successfully linked/verified (but not initialized yet)
146 being_initialized, // currently running class initializer
147 fully_initialized, // initialized (successfull final state)
148 initialization_error // error happened during initialization
149 };
150
151 static int number_of_instance_classes() { return _total_instanceKlass_count; }
152
153 private:
154 static volatile int _total_instanceKlass_count;
155
156 protected:
157 // Annotations for this class
158 Annotations* _annotations;
159 // Array classes holding elements of this class.
160 Klass* _array_klasses;
161 // Constant pool for this class.
162 ConstantPool* _constants;
163 // The InnerClasses attribute and EnclosingMethod attribute. The
164 // _inner_classes is an array of shorts. If the class has InnerClasses
165 // attribute, then the _inner_classes array begins with 4-tuples of shorts
166 // [inner_class_info_index, outer_class_info_index,
167 // inner_name_index, inner_class_access_flags] for the InnerClasses
168 // attribute. If the EnclosingMethod attribute exists, it occupies the
169 // last two shorts [class_index, method_index] of the array. If only
170 // the InnerClasses attribute exists, the _inner_classes array length is
171 // number_of_inner_classes * 4. If the class has both InnerClasses
172 // and EnclosingMethod attributes the _inner_classes array length is
173 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
174 Array<jushort>* _inner_classes;
175
176 // the source debug extension for this klass, NULL if not specified.
177 // Specified as UTF-8 string without terminating zero byte in the classfile,
178 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
179 char* _source_debug_extension;
180 // Array name derived from this class which needs unreferencing
181 // if this class is unloaded.
182 Symbol* _array_name;
183
184 // Number of heapOopSize words used by non-static fields in this klass
185 // (including inherited fields but after header_size()).
186 int _nonstatic_field_size;
187 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
188 // Constant pool index to the utf8 entry of the Generic signature,
189 // or 0 if none.
190 u2 _generic_signature_index;
191 // Constant pool index to the utf8 entry for the name of source file
192 // containing this klass, 0 if not specified.
193 u2 _source_file_name_index;
194 u2 _static_oop_field_count;// number of static oop fields in this klass
195 u2 _java_fields_count; // The number of declared Java fields
196 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
197
198 // _is_marked_dependent can be set concurrently, thus cannot be part of the
199 // _misc_flags.
200 bool _is_marked_dependent; // used for marking during flushing and deoptimization
201 bool _has_unloaded_dependent;
202
203 // The low two bits of _misc_flags contains the kind field.
204 // This can be used to quickly discriminate among the four kinds of
205 // InstanceKlass.
206
207 static const unsigned _misc_kind_field_size = 2;
208 static const unsigned _misc_kind_field_pos = 0;
209 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
210
211 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
212 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
213 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
214 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
215
216 // Start after _misc_kind field.
217 enum {
218 _misc_rewritten = 1 << 2, // methods rewritten.
219 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
220 _misc_should_verify_class = 1 << 4, // allow caching of preverification
221 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
222 _misc_is_contended = 1 << 6, // marked with contended annotation
223 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods
224 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
225 _misc_has_been_redefined = 1 << 9, // class has been redefined
226 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class
227 };
228 u2 _misc_flags;
229 u2 _minor_version; // minor version number of class file
230 u2 _major_version; // major version number of class file
231 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
232 int _vtable_len; // length of Java vtable (in words)
233 int _itable_len; // length of Java itable (in words)
234 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
235 MemberNameTable* _member_names; // Member names
236 JNIid* _jni_ids; // First JNI identifier for static fields in this class
237 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
238 nmethodBucket* _dependencies; // list of dependent nmethods
239 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
240 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
241 // Linked instanceKlasses of previous versions
242 InstanceKlass* _previous_versions;
243 // JVMTI fields can be moved to their own structure - see 6315920
244 // JVMTI: cached class file, before retransformable agent modified it in CFLH
245 JvmtiCachedClassFileData* _cached_class_file;
246
247 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
248
249 // Class states are defined as ClassState (see above).
250 // Place the _init_state here to utilize the unused 2-byte after
251 // _idnum_allocated_count.
252 u1 _init_state; // state of class
253 u1 _reference_type; // reference type
254
255 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
256
257 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
258
259 // Method array.
260 Array<Method*>* _methods;
261 // Default Method Array, concrete methods inherited from interfaces
262 Array<Method*>* _default_methods;
263 // Interface (Klass*s) this class declares locally to implement.
264 Array<Klass*>* _local_interfaces;
265 // Interface (Klass*s) this class implements transitively.
266 Array<Klass*>* _transitive_interfaces;
267 // Int array containing the original order of method in the class file (for JVMTI).
268 Array<int>* _method_ordering;
269 // Int array containing the vtable_indices for default_methods
270 // offset matches _default_methods offset
271 Array<int>* _default_vtable_indices;
272
273 // Instance and static variable information, starts with 6-tuples of shorts
274 // [access, name index, sig index, initval index, low_offset, high_offset]
275 // for all fields, followed by the generic signature data at the end of
276 // the array. Only fields with generic signature attributes have the generic
277 // signature data set in the array. The fields array looks like following:
278 //
279 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
280 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
281 // ...
282 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
283 // [generic signature index]
284 // [generic signature index]
285 // ...
286 Array<u2>* _fields;
287
288 // embedded Java vtable follows here
289 // embedded Java itables follows here
290 // embedded static fields follows here
291 // embedded nonstatic oop-map blocks follows here
292 // embedded implementor of this interface follows here
293 // The embedded implementor only exists if the current klass is an
294 // iterface. The possible values of the implementor fall into following
295 // three cases:
296 // NULL: no implementor.
297 // A Klass* that's not itself: one implementor.
298 // Itself: more than one implementors.
299 // embedded host klass follows here
300 // The embedded host klass only exists in an anonymous class for
301 // dynamic language support (JSR 292 enabled). The host class grants
302 // its access privileges to this class also. The host class is either
303 // named, or a previously loaded anonymous class. A non-anonymous class
304 // or an anonymous class loaded through normal classloading does not
305 // have this embedded field.
306 //
307
308 friend class SystemDictionary;
309
310 public:
311 bool has_nonstatic_fields() const {
312 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
313 }
314 void set_has_nonstatic_fields(bool b) {
315 if (b) {
316 _misc_flags |= _misc_has_nonstatic_fields;
317 } else {
318 _misc_flags &= ~_misc_has_nonstatic_fields;
319 }
320 }
321
322 // field sizes
323 int nonstatic_field_size() const { return _nonstatic_field_size; }
324 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
325
326 int static_field_size() const { return _static_field_size; }
327 void set_static_field_size(int size) { _static_field_size = size; }
328
329 int static_oop_field_count() const { return (int)_static_oop_field_count; }
330 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
331
332 // Java vtable
333 int vtable_length() const { return _vtable_len; }
334 void set_vtable_length(int len) { _vtable_len = len; }
335
336 // Java itable
337 int itable_length() const { return _itable_len; }
338 void set_itable_length(int len) { _itable_len = len; }
339
340 // array klasses
341 Klass* array_klasses() const { return _array_klasses; }
342 void set_array_klasses(Klass* k) { _array_klasses = k; }
343
344 // methods
345 Array<Method*>* methods() const { return _methods; }
346 void set_methods(Array<Method*>* a) { _methods = a; }
347 Method* method_with_idnum(int idnum);
348 Method* method_with_orig_idnum(int idnum);
349 Method* method_with_orig_idnum(int idnum, int version);
350
351 // method ordering
352 Array<int>* method_ordering() const { return _method_ordering; }
353 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
354 void copy_method_ordering(intArray* m, TRAPS);
355
356 // default_methods
357 Array<Method*>* default_methods() const { return _default_methods; }
358 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
359
360 // default method vtable_indices
361 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
362 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
363 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
364
365 // interfaces
366 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
367 void set_local_interfaces(Array<Klass*>* a) {
368 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
369 _local_interfaces = a; }
370
371 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
372 void set_transitive_interfaces(Array<Klass*>* a) {
373 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
374 _transitive_interfaces = a;
375 }
376
377 private:
378 friend class fieldDescriptor;
379 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
380
381 public:
382 int field_offset (int index) const { return field(index)->offset(); }
383 int field_access_flags(int index) const { return field(index)->access_flags(); }
384 Symbol* field_name (int index) const { return field(index)->name(constants()); }
385 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
386
387 // Number of Java declared fields
388 int java_fields_count() const { return (int)_java_fields_count; }
389
390 Array<u2>* fields() const { return _fields; }
391 void set_fields(Array<u2>* f, u2 java_fields_count) {
392 guarantee(_fields == NULL || f == NULL, "Just checking");
393 _fields = f;
394 _java_fields_count = java_fields_count;
395 }
396
397 // inner classes
398 Array<u2>* inner_classes() const { return _inner_classes; }
399 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
400
401 enum InnerClassAttributeOffset {
402 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
403 inner_class_inner_class_info_offset = 0,
404 inner_class_outer_class_info_offset = 1,
405 inner_class_inner_name_offset = 2,
406 inner_class_access_flags_offset = 3,
407 inner_class_next_offset = 4
408 };
409
410 enum EnclosingMethodAttributeOffset {
411 enclosing_method_class_index_offset = 0,
412 enclosing_method_method_index_offset = 1,
413 enclosing_method_attribute_size = 2
414 };
415
416 // method override check
417 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
418
419 // package
420 bool is_same_class_package(Klass* class2);
421 bool is_same_class_package(oop classloader2, Symbol* classname2);
422 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
423
424 // find an enclosing class
425 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
426 instanceKlassHandle self(THREAD, this);
427 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
428 }
429 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
430 bool* inner_is_member, TRAPS);
431
432 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
433 static bool find_inner_classes_attr(instanceKlassHandle k,
434 int* ooff, int* noff, TRAPS);
435
436 // tell if two classes have the same enclosing class (at package level)
437 bool is_same_package_member(Klass* class2, TRAPS) {
438 instanceKlassHandle self(THREAD, this);
439 return is_same_package_member_impl(self, class2, THREAD);
440 }
441 static bool is_same_package_member_impl(instanceKlassHandle self,
442 Klass* class2, TRAPS);
443
444 // initialization state
445 bool is_loaded() const { return _init_state >= loaded; }
446 bool is_linked() const { return _init_state >= linked; }
447 bool is_initialized() const { return _init_state == fully_initialized; }
448 bool is_not_initialized() const { return _init_state < being_initialized; }
449 bool is_being_initialized() const { return _init_state == being_initialized; }
450 bool is_in_error_state() const { return _init_state == initialization_error; }
451 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
452 ClassState init_state() { return (ClassState)_init_state; }
453 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
454
455 // defineClass specified verification
456 bool should_verify_class() const {
457 return (_misc_flags & _misc_should_verify_class) != 0;
458 }
459 void set_should_verify_class(bool value) {
460 if (value) {
461 _misc_flags |= _misc_should_verify_class;
462 } else {
463 _misc_flags &= ~_misc_should_verify_class;
464 }
465 }
466
467 // marking
468 bool is_marked_dependent() const { return _is_marked_dependent; }
469 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
470
471 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
472 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
473
474 // initialization (virtuals from Klass)
475 bool should_be_initialized() const; // means that initialize should be called
476 void initialize(TRAPS);
477 void link_class(TRAPS);
478 bool link_class_or_fail(TRAPS); // returns false on failure
479 void unlink_class();
480 void rewrite_class(TRAPS);
481 void link_methods(TRAPS);
482 Method* class_initializer();
483
484 // set the class to initialized if no static initializer is present
485 void eager_initialize(Thread *thread);
486
487 // reference type
488 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
489 void set_reference_type(ReferenceType t) {
490 assert(t == (u1)t, "overflow");
491 _reference_type = (u1)t;
492 }
493
494 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
495
496 // find local field, returns true if found
497 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
498 // find field in direct superinterfaces, returns the interface in which the field is defined
499 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
500 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
501 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
502 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
503 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
504
505 // find a non-static or static field given its offset within the class.
506 bool contains_field_offset(int offset) {
507 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
508 }
509
510 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
511 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
512
513 // find a local method (returns NULL if not found)
514 Method* find_method(Symbol* name, Symbol* signature) const;
515 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
516
517 // find a local method, but skip static methods
518 Method* find_instance_method(Symbol* name, Symbol* signature);
519 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
520
521 // find a local method (returns NULL if not found)
522 Method* find_local_method(Symbol* name, Symbol* signature,
523 OverpassLookupMode overpass_mode,
524 StaticLookupMode static_mode,
525 PrivateLookupMode private_mode) const;
526
527 // find a local method from given methods array (returns NULL if not found)
528 static Method* find_local_method(Array<Method*>* methods,
529 Symbol* name, Symbol* signature,
530 OverpassLookupMode overpass_mode,
531 StaticLookupMode static_mode,
532 PrivateLookupMode private_mode);
533
534 // true if method matches signature and conforms to skipping_X conditions.
535 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
536
537 // find a local method index in methods or default_methods (returns -1 if not found)
538 static int find_method_index(Array<Method*>* methods,
539 Symbol* name, Symbol* signature,
540 OverpassLookupMode overpass_mode,
541 StaticLookupMode static_mode,
542 PrivateLookupMode private_mode);
543
544 // lookup operation (returns NULL if not found)
545 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
546
547 // lookup a method in all the interfaces that this class implements
548 // (returns NULL if not found)
549 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
550
551 // lookup a method in local defaults then in all interfaces
552 // (returns NULL if not found)
553 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
554
555 // Find method indices by name. If a method with the specified name is
556 // found the index to the first method is returned, and 'end' is filled in
557 // with the index of first non-name-matching method. If no method is found
558 // -1 is returned.
559 int find_method_by_name(Symbol* name, int* end);
560 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
561
562 // constant pool
563 ConstantPool* constants() const { return _constants; }
564 void set_constants(ConstantPool* c) { _constants = c; }
565
566 // protection domain
567 oop protection_domain() const;
568
569 // signers
570 objArrayOop signers() const;
571
572 // host class
573 Klass* host_klass() const {
574 Klass** hk = (Klass**)adr_host_klass();
575 if (hk == NULL) {
576 return NULL;
577 } else {
578 assert(*hk != NULL, "host klass should always be set if the address is not null");
579 return *hk;
580 }
581 }
582 void set_host_klass(Klass* host) {
583 assert(is_anonymous(), "not anonymous");
584 Klass** addr = (Klass**)adr_host_klass();
585 assert(addr != NULL, "no reversed space");
586 if (addr != NULL) {
587 *addr = host;
588 }
589 }
590 bool is_anonymous() const {
591 return (_misc_flags & _misc_is_anonymous) != 0;
592 }
593 void set_is_anonymous(bool value) {
594 if (value) {
595 _misc_flags |= _misc_is_anonymous;
596 } else {
597 _misc_flags &= ~_misc_is_anonymous;
598 }
599 }
600
601 // Oop that keeps the metadata for this class from being unloaded
602 // in places where the metadata is stored in other places, like nmethods
603 oop klass_holder() const {
604 return is_anonymous() ? java_mirror() : class_loader();
605 }
606
607 bool is_contended() const {
608 return (_misc_flags & _misc_is_contended) != 0;
609 }
610 void set_is_contended(bool value) {
611 if (value) {
612 _misc_flags |= _misc_is_contended;
613 } else {
614 _misc_flags &= ~_misc_is_contended;
615 }
616 }
617
618 // source file name
619 Symbol* source_file_name() const {
620 return (_source_file_name_index == 0) ?
621 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
622 }
623 u2 source_file_name_index() const {
624 return _source_file_name_index;
625 }
626 void set_source_file_name_index(u2 sourcefile_index) {
627 _source_file_name_index = sourcefile_index;
628 }
629
630 // minor and major version numbers of class file
631 u2 minor_version() const { return _minor_version; }
632 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
633 u2 major_version() const { return _major_version; }
634 void set_major_version(u2 major_version) { _major_version = major_version; }
635
636 // source debug extension
637 char* source_debug_extension() const { return _source_debug_extension; }
638 void set_source_debug_extension(char* array, int length);
639
640 // symbol unloading support (refcount already added)
641 Symbol* array_name() { return _array_name; }
642 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
643
644 // nonstatic oop-map blocks
645 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
646 return oop_map_count * OopMapBlock::size_in_words();
647 }
648 unsigned int nonstatic_oop_map_count() const {
649 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
650 }
651 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
652 void set_nonstatic_oop_map_size(int words) {
653 _nonstatic_oop_map_size = words;
654 }
655
656 // RedefineClasses() support for previous versions:
657 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
658
659 InstanceKlass* previous_versions() const { return _previous_versions; }
660
661 InstanceKlass* get_klass_version(int version) {
662 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
663 if (ik->constants()->version() == version) {
664 return ik;
665 }
666 }
667 return NULL;
668 }
669
670 bool has_been_redefined() const {
671 return (_misc_flags & _misc_has_been_redefined) != 0;
672 }
673 void set_has_been_redefined() {
674 _misc_flags |= _misc_has_been_redefined;
675 }
676
677 bool is_scratch_class() const {
678 return (_misc_flags & _misc_is_scratch_class) != 0;
679 }
680
681 void set_is_scratch_class() {
682 _misc_flags |= _misc_is_scratch_class;
683 }
684
685 private:
686
687 void set_kind(unsigned kind) {
688 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
689 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
690 unsigned flags = _misc_flags & ~fmask;
691 _misc_flags = (flags | (kind << _misc_kind_field_pos));
692 }
693
694 bool is_kind(unsigned desired) const {
695 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
696 return kind == desired;
697 }
698
699 public:
700
701 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
702 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
703 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
704 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
705 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
706
707 void init_previous_versions() {
708 _previous_versions = NULL;
709 }
710
711 private:
712 static int _previous_version_count;
713 public:
714 static void purge_previous_versions(InstanceKlass* ik);
715 static bool has_previous_versions() { return _previous_version_count > 0; }
716
717 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
718 void set_cached_class_file(JvmtiCachedClassFileData *data) {
719 _cached_class_file = data;
720 }
721 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
722 jint get_cached_class_file_len();
723 unsigned char * get_cached_class_file_bytes();
724
725 // JVMTI: Support for caching of field indices, types, and offsets
726 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
727 _jvmti_cached_class_field_map = descriptor;
728 }
729 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
730 return _jvmti_cached_class_field_map;
731 }
732
733 bool has_default_methods() const {
734 return (_misc_flags & _misc_has_default_methods) != 0;
735 }
736 void set_has_default_methods(bool b) {
737 if (b) {
738 _misc_flags |= _misc_has_default_methods;
739 } else {
740 _misc_flags &= ~_misc_has_default_methods;
741 }
742 }
743
744 bool declares_default_methods() const {
745 return (_misc_flags & _misc_declares_default_methods) != 0;
746 }
747 void set_declares_default_methods(bool b) {
748 if (b) {
749 _misc_flags |= _misc_declares_default_methods;
750 } else {
751 _misc_flags &= ~_misc_declares_default_methods;
752 }
753 }
754
755 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
756 inline u2 next_method_idnum();
757 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
758
759 // generics support
760 Symbol* generic_signature() const {
761 return (_generic_signature_index == 0) ?
762 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
763 }
764 u2 generic_signature_index() const {
765 return _generic_signature_index;
766 }
767 void set_generic_signature_index(u2 sig_index) {
768 _generic_signature_index = sig_index;
769 }
770
771 u2 enclosing_method_data(int offset);
772 u2 enclosing_method_class_index() {
773 return enclosing_method_data(enclosing_method_class_index_offset);
774 }
775 u2 enclosing_method_method_index() {
776 return enclosing_method_data(enclosing_method_method_index_offset);
777 }
778 void set_enclosing_method_indices(u2 class_index,
779 u2 method_index);
780
781 // jmethodID support
782 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
783 const methodHandle& method_h);
784 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
785 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
786 jmethodID* to_dealloc_id_p,
787 jmethodID** to_dealloc_jmeths_p);
788 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
789 size_t *length_p, jmethodID* id_p);
790 void ensure_space_for_methodids(int start_offset = 0);
791 jmethodID jmethod_id_or_null(Method* method);
792
793 // annotations support
794 Annotations* annotations() const { return _annotations; }
795 void set_annotations(Annotations* anno) { _annotations = anno; }
796
797 AnnotationArray* class_annotations() const {
798 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
799 }
800 Array<AnnotationArray*>* fields_annotations() const {
801 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
802 }
803 AnnotationArray* class_type_annotations() const {
804 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
805 }
806 Array<AnnotationArray*>* fields_type_annotations() const {
807 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
808 }
809 // allocation
810 instanceOop allocate_instance(TRAPS);
811
812 // additional member function to return a handle
813 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
814
815 objArrayOop allocate_objArray(int n, int length, TRAPS);
816 // Helper function
817 static instanceOop register_finalizer(instanceOop i, TRAPS);
818
819 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
820 // if not, throw either an Error or an Exception.
821 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
822
823 // initialization
824 void call_class_initializer(TRAPS);
825 void set_initialization_state_and_notify(ClassState state, TRAPS);
826
827 // OopMapCache support
828 OopMapCache* oop_map_cache() { return _oop_map_cache; }
829 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
830 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
831
832 // JNI identifier support (for static fields - for jni performance)
833 JNIid* jni_ids() { return _jni_ids; }
834 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
835 JNIid* jni_id_for(int offset);
836
837 // maintenance of deoptimization dependencies
838 int mark_dependent_nmethods(DepChange& changes);
839 void add_dependent_nmethod(nmethod* nm);
840 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
841
842 // On-stack replacement support
843 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
844 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
845 void add_osr_nmethod(nmethod* n);
846 void remove_osr_nmethod(nmethod* n);
847 int mark_osr_nmethods(const Method* m);
848 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
849
850 // Breakpoint support (see methods on Method* for details)
851 BreakpointInfo* breakpoints() const { return _breakpoints; };
852 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
853
854 // support for stub routines
855 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
856 TRACE_DEFINE_OFFSET;
857 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
858
859 // subclass/subinterface checks
860 bool implements_interface(Klass* k) const;
861 bool is_same_or_direct_interface(Klass* k) const;
862
863 #ifdef ASSERT
864 // check whether this class or one of its superclasses was redefined
865 bool has_redefined_this_or_super();
866 #endif
867
868 // Access to the implementor of an interface.
869 Klass* implementor() const
870 {
871 Klass** k = adr_implementor();
872 if (k == NULL) {
873 return NULL;
874 } else {
875 return *k;
876 }
877 }
878
879 void set_implementor(Klass* k) {
880 assert(is_interface(), "not interface");
881 Klass** addr = adr_implementor();
882 assert(addr != NULL, "null addr");
883 if (addr != NULL) {
884 *addr = k;
885 }
886 }
887
888 int nof_implementors() const {
889 Klass* k = implementor();
890 if (k == NULL) {
891 return 0;
892 } else if (k != this) {
893 return 1;
894 } else {
895 return 2;
896 }
897 }
898
899 void add_implementor(Klass* k); // k is a new class that implements this interface
900 void init_implementor(); // initialize
901
902 // link this class into the implementors list of every interface it implements
903 void process_interfaces(Thread *thread);
904
905 // virtual operations from Klass
906 bool is_leaf_class() const { return _subklass == NULL; }
907 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
908 bool compute_is_subtype_of(Klass* k);
909 bool can_be_primary_super_slow() const;
910 int oop_size(oop obj) const { return size_helper(); }
911 // slow because it's a virtual call and used for verifying the layout_helper.
912 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
913 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
914
915 // Iterators
916 void do_local_static_fields(FieldClosure* cl);
917 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
918 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
919
920 void methods_do(void f(Method* method));
921 void array_klasses_do(void f(Klass* k));
922 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
923 bool super_types_do(SuperTypeClosure* blk);
924
925 // Casting from Klass*
926 static InstanceKlass* cast(Klass* k) {
927 assert(k != NULL, "k should not be null");
928 assert(k->is_instance_klass(), "cast to InstanceKlass");
929 return static_cast<InstanceKlass*>(k);
930 }
931
932 InstanceKlass* java_super() const {
933 return (super() == NULL) ? NULL : cast(super());
934 }
935
936 // Sizing (in words)
937 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
938
939 static int size(int vtable_length, int itable_length,
940 int nonstatic_oop_map_size,
941 bool is_interface, bool is_anonymous) {
942 return align_object_size(header_size() +
943 align_object_offset(vtable_length) +
944 align_object_offset(itable_length) +
945 ((is_interface || is_anonymous) ?
946 align_object_offset(nonstatic_oop_map_size) :
947 nonstatic_oop_map_size) +
948 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
949 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
950 }
951 int size() const { return size(vtable_length(),
952 itable_length(),
953 nonstatic_oop_map_size(),
954 is_interface(),
955 is_anonymous());
956 }
957 #if INCLUDE_SERVICES
958 virtual void collect_statistics(KlassSizeStats *sz) const;
959 #endif
960
961 static int vtable_start_offset() { return header_size(); }
962 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
963
964 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
965 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
966 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
967
968 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
969
970 address static_field_addr(int offset);
971
972 OopMapBlock* start_of_nonstatic_oop_maps() const {
973 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
974 }
975
976 Klass** end_of_nonstatic_oop_maps() const {
977 return (Klass**)(start_of_nonstatic_oop_maps() +
978 nonstatic_oop_map_count());
979 }
980
981 Klass** adr_implementor() const {
982 if (is_interface()) {
983 return (Klass**)end_of_nonstatic_oop_maps();
984 } else {
985 return NULL;
986 }
987 };
988
989 Klass** adr_host_klass() const {
990 if (is_anonymous()) {
991 Klass** adr_impl = adr_implementor();
992 if (adr_impl != NULL) {
993 return adr_impl + 1;
994 } else {
995 return end_of_nonstatic_oop_maps();
996 }
997 } else {
998 return NULL;
999 }
1000 }
1001
1002 // Use this to return the size of an instance in heap words:
1003 int size_helper() const {
1004 return layout_helper_to_size_helper(layout_helper());
1005 }
1006
1007 // This bit is initialized in classFileParser.cpp.
1008 // It is false under any of the following conditions:
1009 // - the class is abstract (including any interface)
1010 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1011 // - the class size is larger than FastAllocateSizeLimit
1012 // - the class is java/lang/Class, which cannot be allocated directly
1013 bool can_be_fastpath_allocated() const {
1014 return !layout_helper_needs_slow_path(layout_helper());
1015 }
1016
1017 // Java vtable/itable
1018 klassVtable* vtable() const; // return new klassVtable wrapper
1019 inline Method* method_at_vtable(int index);
1020 klassItable* itable() const; // return new klassItable wrapper
1021 Method* method_at_itable(Klass* holder, int index, TRAPS);
1022
1023 #if INCLUDE_JVMTI
1024 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1025 #endif // INCLUDE_JVMTI
1026
1027 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1028 void clean_implementors_list(BoolObjectClosure* is_alive);
1029 void clean_method_data(BoolObjectClosure* is_alive);
1030 void clean_dependent_nmethods();
1031
1032 // Explicit metaspace deallocation of fields
1033 // For RedefineClasses and class file parsing errors, we need to deallocate
1034 // instanceKlasses and the metadata they point to.
1035 void deallocate_contents(ClassLoaderData* loader_data);
1036 static void deallocate_methods(ClassLoaderData* loader_data,
1037 Array<Method*>* methods);
1038 void static deallocate_interfaces(ClassLoaderData* loader_data,
1039 Klass* super_klass,
1040 Array<Klass*>* local_interfaces,
1041 Array<Klass*>* transitive_interfaces);
1042
1043 // The constant pool is on stack if any of the methods are executing or
1044 // referenced by handles.
1045 bool on_stack() const { return _constants->on_stack(); }
1046
1047 // callbacks for actions during class unloading
1048 static void notify_unload_class(InstanceKlass* ik);
1049 static void release_C_heap_structures(InstanceKlass* ik);
1050
1051 // Naming
1052 const char* signature_name() const;
1053
1054 // GC specific object visitors
1055 //
1056 // Mark Sweep
1057 int oop_ms_adjust_pointers(oop obj);
1058 #if INCLUDE_ALL_GCS
1059 // Parallel Scavenge
1060 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1061 // Parallel Compact
1062 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1063 void oop_pc_update_pointers(oop obj);
1064 #endif
1065
1066 // Oop fields (and metadata) iterators
1067 // [nv = true] Use non-virtual calls to do_oop_nv.
1068 // [nv = false] Use virtual calls to do_oop.
1069 //
1070 // The InstanceKlass iterators also visits the Object's klass.
1071
1072 // Forward iteration
1073 public:
1074 // Iterate over all oop fields in the oop maps.
1075 template <bool nv, class OopClosureType>
1076 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1077
1078 protected:
1079 // Iterate over all oop fields and metadata.
1080 template <bool nv, class OopClosureType>
1081 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1082
1083 private:
1084 // Iterate over all oop fields in the oop maps.
1085 // Specialized for [T = oop] or [T = narrowOop].
1086 template <bool nv, typename T, class OopClosureType>
1087 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1088
1089 // Iterate over all oop fields in one oop map.
1090 template <bool nv, typename T, class OopClosureType>
1091 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1092
1093
1094 // Reverse iteration
1095 #if INCLUDE_ALL_GCS
1096 public:
1097 // Iterate over all oop fields in the oop maps.
1098 template <bool nv, class OopClosureType>
1099 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1100
1101 protected:
1102 // Iterate over all oop fields and metadata.
1103 template <bool nv, class OopClosureType>
1104 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1105
1106 private:
1107 // Iterate over all oop fields in the oop maps.
1108 // Specialized for [T = oop] or [T = narrowOop].
1109 template <bool nv, typename T, class OopClosureType>
1110 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1111
1112 // Iterate over all oop fields in one oop map.
1113 template <bool nv, typename T, class OopClosureType>
1114 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1115 #endif
1116
1117
1118 // Bounded range iteration
1119 public:
1120 // Iterate over all oop fields in the oop maps.
1121 template <bool nv, class OopClosureType>
1122 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1123
1124 protected:
1125 // Iterate over all oop fields and metadata.
1126 template <bool nv, class OopClosureType>
1127 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1128
1129 private:
1130 // Iterate over all oop fields in the oop maps.
1131 // Specialized for [T = oop] or [T = narrowOop].
1132 template <bool nv, typename T, class OopClosureType>
1133 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1134
1135 // Iterate over all oop fields in one oop map.
1136 template <bool nv, typename T, class OopClosureType>
1137 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1138
1139
1140 public:
1141
1142 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1143 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1144
1145 #if INCLUDE_ALL_GCS
1146 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1147 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1148 #endif // INCLUDE_ALL_GCS
1149
1150 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1151
1152 public:
1153 void set_in_error_state() {
1154 assert(DumpSharedSpaces, "only call this when dumping archive");
1155 _init_state = initialization_error;
1156 }
1157 bool check_sharing_error_state();
1158
1159 private:
1160 // initialization state
1161 #ifdef ASSERT
1162 void set_init_state(ClassState state);
1163 #else
1164 void set_init_state(ClassState state) { _init_state = (u1)state; }
1165 #endif
1166 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1167 void set_init_thread(Thread *thread) { _init_thread = thread; }
1168
1169 // The RedefineClasses() API can cause new method idnums to be needed
1170 // which will cause the caches to grow. Safety requires different
1171 // cache management logic if the caches can grow instead of just
1172 // going from NULL to non-NULL.
1173 bool idnum_can_increment() const { return has_been_redefined(); }
1174 jmethodID* methods_jmethod_ids_acquire() const
1175 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1176 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1177 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1178
1179 // Lock during initialization
1180 public:
1181 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1182 // Must be one per class and it has to be a VM internal object so java code
1183 // cannot lock it (like the mirror).
1184 // It has to be an object not a Mutex because it's held through java calls.
1185 oop init_lock() const;
1186 private:
1187 void fence_and_clear_init_lock();
1188
1189 // Static methods that are used to implement member methods where an exposed this pointer
1190 // is needed due to possible GCs
1191 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1192 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1193 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1194 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1195 static void eager_initialize_impl (instanceKlassHandle this_k);
1196 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1197 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1198 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1199 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1200 /* jni_id_for_impl for jfieldID only */
1201 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1202
1203 // Returns the array class for the n'th dimension
1204 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1205
1206 // Returns the array class with this class as element type
1207 Klass* array_klass_impl(bool or_null, TRAPS);
1208
1209 // find a local method (returns NULL if not found)
1210 Method* find_method_impl(Symbol* name, Symbol* signature,
1211 OverpassLookupMode overpass_mode,
1212 StaticLookupMode static_mode,
1213 PrivateLookupMode private_mode) const;
1214 static Method* find_method_impl(Array<Method*>* methods,
1215 Symbol* name, Symbol* signature,
1216 OverpassLookupMode overpass_mode,
1217 StaticLookupMode static_mode,
1218 PrivateLookupMode private_mode);
1219
1220 // Free CHeap allocated fields.
1221 void release_C_heap_structures();
1222
1223 // RedefineClasses support
1224 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1225 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1226 public:
1227 // CDS support - remove and restore oops from metadata. Oops are not shared.
1228 virtual void remove_unshareable_info();
1229 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1230
1231 // jvm support
1232 jint compute_modifier_flags(TRAPS) const;
1233
1234 // JSR-292 support
1235 MemberNameTable* member_names() { return _member_names; }
1236 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1237 bool add_member_name(Handle member_name);
1238
1239 public:
1240 // JVMTI support
1241 jint jvmti_class_status() const;
1242
1243 public:
1244 // Printing
1245 #ifndef PRODUCT
1246 void print_on(outputStream* st) const;
1247 #endif
1248 void print_value_on(outputStream* st) const;
1249
1250 void oop_print_value_on(oop obj, outputStream* st);
1251
1252 #ifndef PRODUCT
1253 void oop_print_on (oop obj, outputStream* st);
1254
1255 void print_dependent_nmethods(bool verbose = false);
1256 bool is_dependent_nmethod(nmethod* nm);
1257 #endif
1258
1259 const char* internal_name() const;
1260
1261 // Verification
1262 void verify_on(outputStream* st);
1263
1264 void oop_verify_on(oop obj, outputStream* st);
1265 };
1266
1267 inline Method* InstanceKlass::method_at_vtable(int index) {
1268 #ifndef PRODUCT
1269 assert(index >= 0, "valid vtable index");
1270 if (DebugVtables) {
1271 verify_vtable_index(index);
1272 }
1273 #endif
1274 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1275 return ve[index].method();
1276 }
1277
1278 // for adding methods
1279 // UNSET_IDNUM return means no more ids available
1280 inline u2 InstanceKlass::next_method_idnum() {
1281 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1282 return ConstMethod::UNSET_IDNUM; // no more ids available
1283 } else {
1284 return _idnum_allocated_count++;
1285 }
1286 }
1287
1288
1289 /* JNIid class for jfieldIDs only */
1290 class JNIid: public CHeapObj<mtClass> {
1291 friend class VMStructs;
1292 private:
1293 Klass* _holder;
1294 JNIid* _next;
1295 int _offset;
1296 #ifdef ASSERT
1297 bool _is_static_field_id;
1298 #endif
1299
1300 public:
1301 // Accessors
1302 Klass* holder() const { return _holder; }
1303 int offset() const { return _offset; }
1304 JNIid* next() { return _next; }
1305 // Constructor
1306 JNIid(Klass* holder, int offset, JNIid* next);
1307 // Identifier lookup
1308 JNIid* find(int offset);
1309
1310 bool find_local_field(fieldDescriptor* fd) {
1311 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1312 }
1313
1314 static void deallocate(JNIid* id);
1315 // Debugging
1316 #ifdef ASSERT
1317 bool is_static_field_id() const { return _is_static_field_id; }
1318 void set_is_static_field_id() { _is_static_field_id = true; }
1319 #endif
1320 void verify(Klass* holder);
1321 };
1322
1323
1324 //
1325 // nmethodBucket is used to record dependent nmethods for
1326 // deoptimization. nmethod dependencies are actually <klass, method>
1327 // pairs but we really only care about the klass part for purposes of
1328 // finding nmethods which might need to be deoptimized. Instead of
1329 // recording the method, a count of how many times a particular nmethod
1330 // was recorded is kept. This ensures that any recording errors are
1331 // noticed since an nmethod should be removed as many times are it's
1332 // added.
1333 //
1334 class nmethodBucket: public CHeapObj<mtClass> {
1335 friend class VMStructs;
1336 private:
1337 nmethod* _nmethod;
1338 int _count;
1339 nmethodBucket* _next;
1340
1341 public:
1342 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1343 _nmethod = nmethod;
1344 _next = next;
1345 _count = 1;
1346 }
1347 int count() { return _count; }
1348 int increment() { _count += 1; return _count; }
1349 int decrement();
1350 nmethodBucket* next() { return _next; }
1351 void set_next(nmethodBucket* b) { _next = b; }
1352 nmethod* get_nmethod() { return _nmethod; }
1353
1354 static int mark_dependent_nmethods(nmethodBucket* deps, DepChange& changes);
1355 static nmethodBucket* add_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1356 static bool remove_dependent_nmethod(nmethodBucket** deps, nmethod* nm, bool delete_immediately);
1357 static bool remove_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1358 static nmethodBucket* clean_dependent_nmethods(nmethodBucket* deps);
1359 #ifndef PRODUCT
1360 static void print_dependent_nmethods(nmethodBucket* deps, bool verbose);
1361 static bool is_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1362 #endif //PRODUCT
1363 };
1364
1365 // An iterator that's used to access the inner classes indices in the
1366 // InstanceKlass::_inner_classes array.
1367 class InnerClassesIterator : public StackObj {
1368 private:
1369 Array<jushort>* _inner_classes;
1370 int _length;
1371 int _idx;
1372 public:
1373
1374 InnerClassesIterator(instanceKlassHandle k) {
1375 _inner_classes = k->inner_classes();
1376 if (k->inner_classes() != NULL) {
1377 _length = _inner_classes->length();
1378 // The inner class array's length should be the multiple of
1379 // inner_class_next_offset if it only contains the InnerClasses
1380 // attribute data, or it should be
1381 // n*inner_class_next_offset+enclosing_method_attribute_size
1382 // if it also contains the EnclosingMethod data.
1383 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1384 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1385 "just checking");
1386 // Remove the enclosing_method portion if exists.
1387 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1388 _length -= InstanceKlass::enclosing_method_attribute_size;
1389 }
1390 } else {
1391 _length = 0;
1392 }
1393 _idx = 0;
1394 }
1395
1396 int length() const {
1397 return _length;
1398 }
1399
1400 void next() {
1401 _idx += InstanceKlass::inner_class_next_offset;
1402 }
1403
1404 bool done() const {
1405 return (_idx >= _length);
1406 }
1407
1408 u2 inner_class_info_index() const {
1409 return _inner_classes->at(
1410 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1411 }
1412
1413 void set_inner_class_info_index(u2 index) {
1414 _inner_classes->at_put(
1415 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1416 }
1417
1418 u2 outer_class_info_index() const {
1419 return _inner_classes->at(
1420 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1421 }
1422
1423 void set_outer_class_info_index(u2 index) {
1424 _inner_classes->at_put(
1425 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1426 }
1427
1428 u2 inner_name_index() const {
1429 return _inner_classes->at(
1430 _idx + InstanceKlass::inner_class_inner_name_offset);
1431 }
1432
1433 void set_inner_name_index(u2 index) {
1434 _inner_classes->at_put(
1435 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1436 }
1437
1438 u2 inner_access_flags() const {
1439 return _inner_classes->at(
1440 _idx + InstanceKlass::inner_class_access_flags_offset);
1441 }
1442 };
1443
1444 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP