1 /*
2 * Copyright (c) 1997, 2016, 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 "logging/logLevel.hpp"
31 #include "memory/referenceType.hpp"
32 #include "oops/annotations.hpp"
33 #include "oops/constMethod.hpp"
34 #include "oops/fieldInfo.hpp"
35 #include "oops/instanceOop.hpp"
36 #include "oops/klassVtable.hpp"
37 #include "runtime/handles.hpp"
38 #include "runtime/os.hpp"
39 #include "trace/traceMacros.hpp"
40 #include "utilities/accessFlags.hpp"
41 #include "utilities/bitMap.inline.hpp"
42 #include "utilities/macros.hpp"
43
44 // An InstanceKlass is the VM level representation of a Java class.
45 // It contains all information needed for at class at execution runtime.
46
47 // InstanceKlass embedded field layout (after declared fields):
48 // [EMBEDDED Java vtable ] size in words = vtable_len
49 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
50 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
51 // indicating where oops are located in instances of this klass.
52 // [EMBEDDED implementor of the interface] only exist for interface
53 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
54
55
56 // forward declaration for class -- see below for definition
57 class BreakpointInfo;
58 class ClassFileParser;
59 class DepChange;
60 class DependencyContext;
61 class fieldDescriptor;
62 class jniIdMapBase;
63 class JNIid;
64 class JvmtiCachedClassFieldMap;
65 class MemberNameTable;
66 class SuperTypeClosure;
67
68 // This is used in iterators below.
69 class FieldClosure: public StackObj {
70 public:
71 virtual void do_field(fieldDescriptor* fd) = 0;
72 };
73
74 #ifndef PRODUCT
75 // Print fields.
76 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
77 class FieldPrinter: public FieldClosure {
78 oop _obj;
79 outputStream* _st;
80 public:
81 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
82 void do_field(fieldDescriptor* fd);
83 };
84 #endif // !PRODUCT
85
86 // ValueObjs embedded in klass. Describes where oops are located in instances of
87 // this klass.
88 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
89 public:
90 // Byte offset of the first oop mapped by this block.
91 int offset() const { return _offset; }
92 void set_offset(int offset) { _offset = offset; }
93
94 // Number of oops in this block.
95 uint count() const { return _count; }
96 void set_count(uint count) { _count = count; }
97
98 // sizeof(OopMapBlock) in HeapWords.
99 static const int size_in_words() {
100 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
101 LogHeapWordSize;
102 }
103
104 private:
105 int _offset;
106 uint _count;
107 };
108
109 struct JvmtiCachedClassFileData;
110
111 class InstanceKlass: public Klass {
112 friend class VMStructs;
113 friend class JVMCIVMStructs;
114 friend class ClassFileParser;
115 friend class CompileReplay;
116
117 protected:
118 InstanceKlass(const ClassFileParser& parser, unsigned kind);
119
120 public:
121 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
122
123 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
124 // of the class loading & initialization procedure, and the use of the states.
125 enum ClassState {
126 allocated, // allocated (but not yet linked)
127 loaded, // loaded and inserted in class hierarchy (but not linked yet)
128 linked, // successfully linked/verified (but not initialized yet)
129 being_initialized, // currently running class initializer
130 fully_initialized, // initialized (successfull final state)
131 initialization_error // error happened during initialization
132 };
133
134 static int number_of_instance_classes() { return _total_instanceKlass_count; }
135
136 private:
137 static volatile int _total_instanceKlass_count;
138 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
139
140 protected:
141 // Annotations for this class
142 Annotations* _annotations;
143 // Array classes holding elements of this class.
144 Klass* _array_klasses;
145 // Constant pool for this class.
146 ConstantPool* _constants;
147 // The InnerClasses attribute and EnclosingMethod attribute. The
148 // _inner_classes is an array of shorts. If the class has InnerClasses
149 // attribute, then the _inner_classes array begins with 4-tuples of shorts
150 // [inner_class_info_index, outer_class_info_index,
151 // inner_name_index, inner_class_access_flags] for the InnerClasses
152 // attribute. If the EnclosingMethod attribute exists, it occupies the
153 // last two shorts [class_index, method_index] of the array. If only
154 // the InnerClasses attribute exists, the _inner_classes array length is
155 // number_of_inner_classes * 4. If the class has both InnerClasses
156 // and EnclosingMethod attributes the _inner_classes array length is
157 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
158 Array<jushort>* _inner_classes;
159
160 // the source debug extension for this klass, NULL if not specified.
161 // Specified as UTF-8 string without terminating zero byte in the classfile,
162 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
163 const char* _source_debug_extension;
164 // Array name derived from this class which needs unreferencing
165 // if this class is unloaded.
166 Symbol* _array_name;
167
168 // Number of heapOopSize words used by non-static fields in this klass
169 // (including inherited fields but after header_size()).
170 int _nonstatic_field_size;
171 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
172 // Constant pool index to the utf8 entry of the Generic signature,
173 // or 0 if none.
174 u2 _generic_signature_index;
175 // Constant pool index to the utf8 entry for the name of source file
176 // containing this klass, 0 if not specified.
177 u2 _source_file_name_index;
178 u2 _static_oop_field_count;// number of static oop fields in this klass
179 u2 _java_fields_count; // The number of declared Java fields
180 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
181
182 // _is_marked_dependent can be set concurrently, thus cannot be part of the
183 // _misc_flags.
184 bool _is_marked_dependent; // used for marking during flushing and deoptimization
185
186 // The low two bits of _misc_flags contains the kind field.
187 // This can be used to quickly discriminate among the four kinds of
188 // InstanceKlass.
189
190 static const unsigned _misc_kind_field_size = 2;
191 static const unsigned _misc_kind_field_pos = 0;
192 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
193
194 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
195 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
196 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
197 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
198
199 // Start after _misc_kind field.
200 enum {
201 _misc_rewritten = 1 << 2, // methods rewritten.
202 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
203 _misc_should_verify_class = 1 << 4, // allow caching of preverification
204 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
205 _misc_is_contended = 1 << 6, // marked with contended annotation
206 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods
207 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
208 _misc_has_been_redefined = 1 << 9, // class has been redefined
209 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class
210 };
211 u2 _misc_flags;
212 u2 _minor_version; // minor version number of class file
213 u2 _major_version; // major version number of class file
214 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
215 int _vtable_len; // length of Java vtable (in words)
216 int _itable_len; // length of Java itable (in words)
217 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
218 MemberNameTable* _member_names; // Member names
219 JNIid* _jni_ids; // First JNI identifier for static fields in this class
220 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
221 intptr_t _dep_context; // packed DependencyContext structure
222 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
223 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
224 // Linked instanceKlasses of previous versions
225 InstanceKlass* _previous_versions;
226 // JVMTI fields can be moved to their own structure - see 6315920
227 // JVMTI: cached class file, before retransformable agent modified it in CFLH
228 JvmtiCachedClassFileData* _cached_class_file;
229
230 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
231
232 // Class states are defined as ClassState (see above).
233 // Place the _init_state here to utilize the unused 2-byte after
234 // _idnum_allocated_count.
235 u1 _init_state; // state of class
236 u1 _reference_type; // reference type
237
238 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
239
240 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
241
242 // Method array.
243 Array<Method*>* _methods;
244 // Default Method Array, concrete methods inherited from interfaces
245 Array<Method*>* _default_methods;
246 // Interface (Klass*s) this class declares locally to implement.
247 Array<Klass*>* _local_interfaces;
248 // Interface (Klass*s) this class implements transitively.
249 Array<Klass*>* _transitive_interfaces;
250 // Int array containing the original order of method in the class file (for JVMTI).
251 Array<int>* _method_ordering;
252 // Int array containing the vtable_indices for default_methods
253 // offset matches _default_methods offset
254 Array<int>* _default_vtable_indices;
255
256 // Instance and static variable information, starts with 6-tuples of shorts
257 // [access, name index, sig index, initval index, low_offset, high_offset]
258 // for all fields, followed by the generic signature data at the end of
259 // the array. Only fields with generic signature attributes have the generic
260 // signature data set in the array. The fields array looks like following:
261 //
262 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
263 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
264 // ...
265 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
266 // [generic signature index]
267 // [generic signature index]
268 // ...
269 Array<u2>* _fields;
270
271 // embedded Java vtable follows here
272 // embedded Java itables follows here
273 // embedded static fields follows here
274 // embedded nonstatic oop-map blocks follows here
275 // embedded implementor of this interface follows here
276 // The embedded implementor only exists if the current klass is an
277 // iterface. The possible values of the implementor fall into following
278 // three cases:
279 // NULL: no implementor.
280 // A Klass* that's not itself: one implementor.
281 // Itself: more than one implementors.
282 // embedded host klass follows here
283 // The embedded host klass only exists in an anonymous class for
284 // dynamic language support (JSR 292 enabled). The host class grants
285 // its access privileges to this class also. The host class is either
286 // named, or a previously loaded anonymous class. A non-anonymous class
287 // or an anonymous class loaded through normal classloading does not
288 // have this embedded field.
289 //
290
291 friend class SystemDictionary;
292
293 public:
294 bool has_nonstatic_fields() const {
295 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
296 }
297 void set_has_nonstatic_fields(bool b) {
298 if (b) {
299 _misc_flags |= _misc_has_nonstatic_fields;
300 } else {
301 _misc_flags &= ~_misc_has_nonstatic_fields;
302 }
303 }
304
305 // field sizes
306 int nonstatic_field_size() const { return _nonstatic_field_size; }
307 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
308
309 int static_field_size() const { return _static_field_size; }
310 void set_static_field_size(int size) { _static_field_size = size; }
311
312 int static_oop_field_count() const { return (int)_static_oop_field_count; }
313 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
314
315 // Java vtable
316 int vtable_length() const { return _vtable_len; }
317 void set_vtable_length(int len) { _vtable_len = len; }
318
319 // Java itable
320 int itable_length() const { return _itable_len; }
321 void set_itable_length(int len) { _itable_len = len; }
322
323 // array klasses
324 Klass* array_klasses() const { return _array_klasses; }
325 void set_array_klasses(Klass* k) { _array_klasses = k; }
326
327 // methods
328 Array<Method*>* methods() const { return _methods; }
329 void set_methods(Array<Method*>* a) { _methods = a; }
330 Method* method_with_idnum(int idnum);
331 Method* method_with_orig_idnum(int idnum);
332 Method* method_with_orig_idnum(int idnum, int version);
333
334 // method ordering
335 Array<int>* method_ordering() const { return _method_ordering; }
336 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
337 void copy_method_ordering(const intArray* m, TRAPS);
338
339 // default_methods
340 Array<Method*>* default_methods() const { return _default_methods; }
341 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
342
343 // default method vtable_indices
344 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
345 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
346 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
347
348 // interfaces
349 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
350 void set_local_interfaces(Array<Klass*>* a) {
351 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
352 _local_interfaces = a; }
353
354 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
355 void set_transitive_interfaces(Array<Klass*>* a) {
356 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
357 _transitive_interfaces = a;
358 }
359
360 private:
361 friend class fieldDescriptor;
362 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
363
364 public:
365 int field_offset (int index) const { return field(index)->offset(); }
366 int field_access_flags(int index) const { return field(index)->access_flags(); }
367 Symbol* field_name (int index) const { return field(index)->name(constants()); }
368 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
369
370 // Number of Java declared fields
371 int java_fields_count() const { return (int)_java_fields_count; }
372
373 Array<u2>* fields() const { return _fields; }
374 void set_fields(Array<u2>* f, u2 java_fields_count) {
375 guarantee(_fields == NULL || f == NULL, "Just checking");
376 _fields = f;
377 _java_fields_count = java_fields_count;
378 }
379
380 // inner classes
381 Array<u2>* inner_classes() const { return _inner_classes; }
382 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
383
384 enum InnerClassAttributeOffset {
385 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
386 inner_class_inner_class_info_offset = 0,
387 inner_class_outer_class_info_offset = 1,
388 inner_class_inner_name_offset = 2,
389 inner_class_access_flags_offset = 3,
390 inner_class_next_offset = 4
391 };
392
393 enum EnclosingMethodAttributeOffset {
394 enclosing_method_class_index_offset = 0,
395 enclosing_method_method_index_offset = 1,
396 enclosing_method_attribute_size = 2
397 };
398
399 // method override check
400 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
401
402 // package
403 bool is_same_class_package(const Klass* class2) const;
404 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
405 static bool is_same_class_package(oop class_loader1,
406 const Symbol* class_name1,
407 oop class_loader2,
408 const Symbol* class_name2);
409
410 // find an enclosing class
411 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const {
412 return compute_enclosing_class_impl(this, inner_is_member, THREAD);
413 }
414 static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self,
415 bool* inner_is_member,
416 TRAPS);
417
418 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
419 static bool find_inner_classes_attr(instanceKlassHandle k,
420 int* ooff, int* noff, TRAPS);
421
422 // tell if two classes have the same enclosing class (at package level)
423 bool is_same_package_member(const Klass* class2, TRAPS) const {
424 return is_same_package_member_impl(this, class2, THREAD);
425 }
426 static bool is_same_package_member_impl(const InstanceKlass* self,
427 const Klass* class2,
428 TRAPS);
429
430 // initialization state
431 bool is_loaded() const { return _init_state >= loaded; }
432 bool is_linked() const { return _init_state >= linked; }
433 bool is_initialized() const { return _init_state == fully_initialized; }
434 bool is_not_initialized() const { return _init_state < being_initialized; }
435 bool is_being_initialized() const { return _init_state == being_initialized; }
436 bool is_in_error_state() const { return _init_state == initialization_error; }
437 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
438 ClassState init_state() { return (ClassState)_init_state; }
439 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
440
441 // defineClass specified verification
442 bool should_verify_class() const {
443 return (_misc_flags & _misc_should_verify_class) != 0;
444 }
445 void set_should_verify_class(bool value) {
446 if (value) {
447 _misc_flags |= _misc_should_verify_class;
448 } else {
449 _misc_flags &= ~_misc_should_verify_class;
450 }
451 }
452
453 // marking
454 bool is_marked_dependent() const { return _is_marked_dependent; }
455 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
456
457 // initialization (virtuals from Klass)
458 bool should_be_initialized() const; // means that initialize should be called
459 void initialize(TRAPS);
460 void link_class(TRAPS);
461 bool link_class_or_fail(TRAPS); // returns false on failure
462 void unlink_class();
463 void rewrite_class(TRAPS);
464 void link_methods(TRAPS);
465 Method* class_initializer();
466
467 // set the class to initialized if no static initializer is present
468 void eager_initialize(Thread *thread);
469
470 // reference type
471 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
472 void set_reference_type(ReferenceType t) {
473 assert(t == (u1)t, "overflow");
474 _reference_type = (u1)t;
475 }
476
477 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
478
479 // find local field, returns true if found
480 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
481 // find field in direct superinterfaces, returns the interface in which the field is defined
482 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
483 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
484 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
485 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
486 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
487
488 // find a non-static or static field given its offset within the class.
489 bool contains_field_offset(int offset) {
490 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
491 }
492
493 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
494 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
495
496 // find a local method (returns NULL if not found)
497 Method* find_method(const Symbol* name, const Symbol* signature) const;
498 static Method* find_method(const Array<Method*>* methods,
499 const Symbol* name,
500 const Symbol* signature);
501
502 // find a local method, but skip static methods
503 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
504 static Method* find_instance_method(const Array<Method*>* methods,
505 const Symbol* name,
506 const Symbol* signature);
507
508 // find a local method (returns NULL if not found)
509 Method* find_local_method(const Symbol* name,
510 const Symbol* signature,
511 OverpassLookupMode overpass_mode,
512 StaticLookupMode static_mode,
513 PrivateLookupMode private_mode) const;
514
515 // find a local method from given methods array (returns NULL if not found)
516 static Method* find_local_method(const Array<Method*>* methods,
517 const Symbol* name,
518 const Symbol* signature,
519 OverpassLookupMode overpass_mode,
520 StaticLookupMode static_mode,
521 PrivateLookupMode private_mode);
522
523 // find a local method index in methods or default_methods (returns -1 if not found)
524 static int find_method_index(const Array<Method*>* methods,
525 const Symbol* name,
526 const Symbol* signature,
527 OverpassLookupMode overpass_mode,
528 StaticLookupMode static_mode,
529 PrivateLookupMode private_mode);
530
531 // lookup operation (returns NULL if not found)
532 Method* uncached_lookup_method(const Symbol* name,
533 const Symbol* signature,
534 OverpassLookupMode overpass_mode) const;
535
536 // lookup a method in all the interfaces that this class implements
537 // (returns NULL if not found)
538 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
539
540 // lookup a method in local defaults then in all interfaces
541 // (returns NULL if not found)
542 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
543
544 // Find method indices by name. If a method with the specified name is
545 // found the index to the first method is returned, and 'end' is filled in
546 // with the index of first non-name-matching method. If no method is found
547 // -1 is returned.
548 int find_method_by_name(const Symbol* name, int* end) const;
549 static int find_method_by_name(const Array<Method*>* methods,
550 const Symbol* name, int* end);
551
552 // constant pool
553 ConstantPool* constants() const { return _constants; }
554 void set_constants(ConstantPool* c) { _constants = c; }
555
556 // protection domain
557 oop protection_domain() const;
558
559 // signers
560 objArrayOop signers() const;
561
562 // host class
563 Klass* host_klass() const {
564 Klass** hk = (Klass**)adr_host_klass();
565 if (hk == NULL) {
566 return NULL;
567 } else {
568 assert(*hk != NULL, "host klass should always be set if the address is not null");
569 return *hk;
570 }
571 }
572 void set_host_klass(const Klass* host) {
573 assert(is_anonymous(), "not anonymous");
574 const Klass** addr = (const Klass**)adr_host_klass();
575 assert(addr != NULL, "no reversed space");
576 if (addr != NULL) {
577 *addr = host;
578 }
579 }
580 bool is_anonymous() const {
581 return (_misc_flags & _misc_is_anonymous) != 0;
582 }
583 void set_is_anonymous(bool value) {
584 if (value) {
585 _misc_flags |= _misc_is_anonymous;
586 } else {
587 _misc_flags &= ~_misc_is_anonymous;
588 }
589 }
590
591 // Oop that keeps the metadata for this class from being unloaded
592 // in places where the metadata is stored in other places, like nmethods
593 oop klass_holder() const {
594 return is_anonymous() ? java_mirror() : class_loader();
595 }
596
597 bool is_contended() const {
598 return (_misc_flags & _misc_is_contended) != 0;
599 }
600 void set_is_contended(bool value) {
601 if (value) {
602 _misc_flags |= _misc_is_contended;
603 } else {
604 _misc_flags &= ~_misc_is_contended;
605 }
606 }
607
608 // source file name
609 Symbol* source_file_name() const {
610 return (_source_file_name_index == 0) ?
611 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
612 }
613 u2 source_file_name_index() const {
614 return _source_file_name_index;
615 }
616 void set_source_file_name_index(u2 sourcefile_index) {
617 _source_file_name_index = sourcefile_index;
618 }
619
620 // minor and major version numbers of class file
621 u2 minor_version() const { return _minor_version; }
622 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
623 u2 major_version() const { return _major_version; }
624 void set_major_version(u2 major_version) { _major_version = major_version; }
625
626 // source debug extension
627 const char* source_debug_extension() const { return _source_debug_extension; }
628 void set_source_debug_extension(const char* array, int length);
629
630 // symbol unloading support (refcount already added)
631 Symbol* array_name() { return _array_name; }
632 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
633
634 // nonstatic oop-map blocks
635 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
636 return oop_map_count * OopMapBlock::size_in_words();
637 }
638 unsigned int nonstatic_oop_map_count() const {
639 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
640 }
641 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
642 void set_nonstatic_oop_map_size(int words) {
643 _nonstatic_oop_map_size = words;
644 }
645
646 // RedefineClasses() support for previous versions:
647 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
648
649 InstanceKlass* previous_versions() const { return _previous_versions; }
650
651 InstanceKlass* get_klass_version(int version) {
652 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
653 if (ik->constants()->version() == version) {
654 return ik;
655 }
656 }
657 return NULL;
658 }
659
660 bool has_been_redefined() const {
661 return (_misc_flags & _misc_has_been_redefined) != 0;
662 }
663 void set_has_been_redefined() {
664 _misc_flags |= _misc_has_been_redefined;
665 }
666
667 bool is_scratch_class() const {
668 return (_misc_flags & _misc_is_scratch_class) != 0;
669 }
670
671 void set_is_scratch_class() {
672 _misc_flags |= _misc_is_scratch_class;
673 }
674
675 private:
676
677 void set_kind(unsigned kind) {
678 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
679 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
680 unsigned flags = _misc_flags & ~fmask;
681 _misc_flags = (flags | (kind << _misc_kind_field_pos));
682 }
683
684 bool is_kind(unsigned desired) const {
685 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
686 return kind == desired;
687 }
688
689 public:
690
691 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
692 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
693 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
694 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
695 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
696
697 void init_previous_versions() {
698 _previous_versions = NULL;
699 }
700
701 private:
702 static int _previous_version_count;
703 public:
704 static void purge_previous_versions(InstanceKlass* ik);
705 static bool has_previous_versions() { return _previous_version_count > 0; }
706
707 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
708 void set_cached_class_file(JvmtiCachedClassFileData *data) {
709 _cached_class_file = data;
710 }
711 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
712 jint get_cached_class_file_len();
713 unsigned char * get_cached_class_file_bytes();
714
715 // JVMTI: Support for caching of field indices, types, and offsets
716 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
717 _jvmti_cached_class_field_map = descriptor;
718 }
719 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
720 return _jvmti_cached_class_field_map;
721 }
722
723 bool has_default_methods() const {
724 return (_misc_flags & _misc_has_default_methods) != 0;
725 }
726 void set_has_default_methods(bool b) {
727 if (b) {
728 _misc_flags |= _misc_has_default_methods;
729 } else {
730 _misc_flags &= ~_misc_has_default_methods;
731 }
732 }
733
734 bool declares_default_methods() const {
735 return (_misc_flags & _misc_declares_default_methods) != 0;
736 }
737 void set_declares_default_methods(bool b) {
738 if (b) {
739 _misc_flags |= _misc_declares_default_methods;
740 } else {
741 _misc_flags &= ~_misc_declares_default_methods;
742 }
743 }
744
745 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
746 inline u2 next_method_idnum();
747 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
748
749 // generics support
750 Symbol* generic_signature() const {
751 return (_generic_signature_index == 0) ?
752 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
753 }
754 u2 generic_signature_index() const {
755 return _generic_signature_index;
756 }
757 void set_generic_signature_index(u2 sig_index) {
758 _generic_signature_index = sig_index;
759 }
760
761 u2 enclosing_method_data(int offset) const;
762 u2 enclosing_method_class_index() const {
763 return enclosing_method_data(enclosing_method_class_index_offset);
764 }
765 u2 enclosing_method_method_index() {
766 return enclosing_method_data(enclosing_method_method_index_offset);
767 }
768 void set_enclosing_method_indices(u2 class_index,
769 u2 method_index);
770
771 // jmethodID support
772 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
773 const methodHandle& method_h);
774 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
775 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
776 jmethodID* to_dealloc_id_p,
777 jmethodID** to_dealloc_jmeths_p);
778 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
779 size_t *length_p, jmethodID* id_p);
780 void ensure_space_for_methodids(int start_offset = 0);
781 jmethodID jmethod_id_or_null(Method* method);
782
783 // annotations support
784 Annotations* annotations() const { return _annotations; }
785 void set_annotations(Annotations* anno) { _annotations = anno; }
786
787 AnnotationArray* class_annotations() const {
788 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
789 }
790 Array<AnnotationArray*>* fields_annotations() const {
791 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
792 }
793 AnnotationArray* class_type_annotations() const {
794 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
795 }
796 Array<AnnotationArray*>* fields_type_annotations() const {
797 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
798 }
799 // allocation
800 instanceOop allocate_instance(TRAPS);
801
802 // additional member function to return a handle
803 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
804
805 objArrayOop allocate_objArray(int n, int length, TRAPS);
806 // Helper function
807 static instanceOop register_finalizer(instanceOop i, TRAPS);
808
809 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
810 // if not, throw either an Error or an Exception.
811 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
812
813 // initialization
814 void call_class_initializer(TRAPS);
815 void set_initialization_state_and_notify(ClassState state, TRAPS);
816
817 // OopMapCache support
818 OopMapCache* oop_map_cache() { return _oop_map_cache; }
819 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
820 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
821
822 // JNI identifier support (for static fields - for jni performance)
823 JNIid* jni_ids() { return _jni_ids; }
824 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
825 JNIid* jni_id_for(int offset);
826
827 // maintenance of deoptimization dependencies
828 inline DependencyContext dependencies();
829 int mark_dependent_nmethods(DepChange& changes);
830 void add_dependent_nmethod(nmethod* nm);
831 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
832
833 // On-stack replacement support
834 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
835 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
836 void add_osr_nmethod(nmethod* n);
837 void remove_osr_nmethod(nmethod* n);
838 int mark_osr_nmethods(const Method* m);
839 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
840
841 // Breakpoint support (see methods on Method* for details)
842 BreakpointInfo* breakpoints() const { return _breakpoints; };
843 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
844
845 // support for stub routines
846 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
847 TRACE_DEFINE_OFFSET;
848 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
849
850 // subclass/subinterface checks
851 bool implements_interface(Klass* k) const;
852 bool is_same_or_direct_interface(Klass* k) const;
853
854 #ifdef ASSERT
855 // check whether this class or one of its superclasses was redefined
856 bool has_redefined_this_or_super() const;
857 #endif
858
859 // Access to the implementor of an interface.
860 Klass* implementor() const
861 {
862 Klass** k = adr_implementor();
863 if (k == NULL) {
864 return NULL;
865 } else {
866 return *k;
867 }
868 }
869
870 void set_implementor(Klass* k) {
871 assert(is_interface(), "not interface");
872 Klass** addr = adr_implementor();
873 assert(addr != NULL, "null addr");
874 if (addr != NULL) {
875 *addr = k;
876 }
877 }
878
879 int nof_implementors() const {
880 Klass* k = implementor();
881 if (k == NULL) {
882 return 0;
883 } else if (k != this) {
884 return 1;
885 } else {
886 return 2;
887 }
888 }
889
890 void add_implementor(Klass* k); // k is a new class that implements this interface
891 void init_implementor(); // initialize
892
893 // link this class into the implementors list of every interface it implements
894 void process_interfaces(Thread *thread);
895
896 // virtual operations from Klass
897 bool is_leaf_class() const { return _subklass == NULL; }
898 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
899 bool compute_is_subtype_of(Klass* k);
900 bool can_be_primary_super_slow() const;
901 int oop_size(oop obj) const { return size_helper(); }
902 // slow because it's a virtual call and used for verifying the layout_helper.
903 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
904 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
905
906 // Iterators
907 void do_local_static_fields(FieldClosure* cl);
908 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
909 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
910
911 void methods_do(void f(Method* method));
912 void array_klasses_do(void f(Klass* k));
913 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
914 bool super_types_do(SuperTypeClosure* blk);
915
916 static InstanceKlass* cast(Klass* k) {
917 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
918 }
919
920 static const InstanceKlass* cast(const Klass* k) {
921 assert(k != NULL, "k should not be null");
922 assert(k->is_instance_klass(), "cast to InstanceKlass");
923 return static_cast<const InstanceKlass*>(k);
924 }
925
926 InstanceKlass* java_super() const {
927 return (super() == NULL) ? NULL : cast(super());
928 }
929
930 // Sizing (in words)
931 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
932
933 static int size(int vtable_length, int itable_length,
934 int nonstatic_oop_map_size,
935 bool is_interface, bool is_anonymous) {
936 return align_object_size(header_size() +
937 align_object_offset(vtable_length) +
938 align_object_offset(itable_length) +
939 ((is_interface || is_anonymous) ?
940 align_object_offset(nonstatic_oop_map_size) :
941 nonstatic_oop_map_size) +
942 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
943 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
944 }
945 int size() const { return size(vtable_length(),
946 itable_length(),
947 nonstatic_oop_map_size(),
948 is_interface(),
949 is_anonymous());
950 }
951 #if INCLUDE_SERVICES
952 virtual void collect_statistics(KlassSizeStats *sz) const;
953 #endif
954
955 static int vtable_start_offset() { return header_size(); }
956 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
957
958 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
959 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
960 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
961
962 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
963
964 address static_field_addr(int offset);
965
966 OopMapBlock* start_of_nonstatic_oop_maps() const {
967 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
968 }
969
970 Klass** end_of_nonstatic_oop_maps() const {
971 return (Klass**)(start_of_nonstatic_oop_maps() +
972 nonstatic_oop_map_count());
973 }
974
975 Klass** adr_implementor() const {
976 if (is_interface()) {
977 return (Klass**)end_of_nonstatic_oop_maps();
978 } else {
979 return NULL;
980 }
981 };
982
983 Klass** adr_host_klass() const {
984 if (is_anonymous()) {
985 Klass** adr_impl = adr_implementor();
986 if (adr_impl != NULL) {
987 return adr_impl + 1;
988 } else {
989 return end_of_nonstatic_oop_maps();
990 }
991 } else {
992 return NULL;
993 }
994 }
995
996 // Use this to return the size of an instance in heap words:
997 int size_helper() const {
998 return layout_helper_to_size_helper(layout_helper());
999 }
1000
1001 // This bit is initialized in classFileParser.cpp.
1002 // It is false under any of the following conditions:
1003 // - the class is abstract (including any interface)
1004 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1005 // - the class size is larger than FastAllocateSizeLimit
1006 // - the class is java/lang/Class, which cannot be allocated directly
1007 bool can_be_fastpath_allocated() const {
1008 return !layout_helper_needs_slow_path(layout_helper());
1009 }
1010
1011 // Java vtable/itable
1012 klassVtable* vtable() const; // return new klassVtable wrapper
1013 inline Method* method_at_vtable(int index);
1014 klassItable* itable() const; // return new klassItable wrapper
1015 Method* method_at_itable(Klass* holder, int index, TRAPS);
1016
1017 #if INCLUDE_JVMTI
1018 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1019 #endif // INCLUDE_JVMTI
1020
1021 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1022 void clean_implementors_list(BoolObjectClosure* is_alive);
1023 void clean_method_data(BoolObjectClosure* is_alive);
1024
1025 // Explicit metaspace deallocation of fields
1026 // For RedefineClasses and class file parsing errors, we need to deallocate
1027 // instanceKlasses and the metadata they point to.
1028 void deallocate_contents(ClassLoaderData* loader_data);
1029 static void deallocate_methods(ClassLoaderData* loader_data,
1030 Array<Method*>* methods);
1031 void static deallocate_interfaces(ClassLoaderData* loader_data,
1032 const Klass* super_klass,
1033 Array<Klass*>* local_interfaces,
1034 Array<Klass*>* transitive_interfaces);
1035
1036 // The constant pool is on stack if any of the methods are executing or
1037 // referenced by handles.
1038 bool on_stack() const { return _constants->on_stack(); }
1039
1040 // callbacks for actions during class unloading
1041 static void notify_unload_class(InstanceKlass* ik);
1042 static void release_C_heap_structures(InstanceKlass* ik);
1043
1044 // Naming
1045 const char* signature_name() const;
1046
1047 // GC specific object visitors
1048 //
1049 // Mark Sweep
1050 int oop_ms_adjust_pointers(oop obj);
1051 #if INCLUDE_ALL_GCS
1052 // Parallel Scavenge
1053 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1054 // Parallel Compact
1055 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1056 void oop_pc_update_pointers(oop obj);
1057 #endif
1058
1059 // Oop fields (and metadata) iterators
1060 // [nv = true] Use non-virtual calls to do_oop_nv.
1061 // [nv = false] Use virtual calls to do_oop.
1062 //
1063 // The InstanceKlass iterators also visits the Object's klass.
1064
1065 // Forward iteration
1066 public:
1067 // Iterate over all oop fields in the oop maps.
1068 template <bool nv, class OopClosureType>
1069 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1070
1071 protected:
1072 // Iterate over all oop fields and metadata.
1073 template <bool nv, class OopClosureType>
1074 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1075
1076 private:
1077 // Iterate over all oop fields in the oop maps.
1078 // Specialized for [T = oop] or [T = narrowOop].
1079 template <bool nv, typename T, class OopClosureType>
1080 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1081
1082 // Iterate over all oop fields in one oop map.
1083 template <bool nv, typename T, class OopClosureType>
1084 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1085
1086
1087 // Reverse iteration
1088 #if INCLUDE_ALL_GCS
1089 public:
1090 // Iterate over all oop fields in the oop maps.
1091 template <bool nv, class OopClosureType>
1092 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1093
1094 protected:
1095 // Iterate over all oop fields and metadata.
1096 template <bool nv, class OopClosureType>
1097 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1098
1099 private:
1100 // Iterate over all oop fields in the oop maps.
1101 // Specialized for [T = oop] or [T = narrowOop].
1102 template <bool nv, typename T, class OopClosureType>
1103 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1104
1105 // Iterate over all oop fields in one oop map.
1106 template <bool nv, typename T, class OopClosureType>
1107 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1108 #endif
1109
1110
1111 // Bounded range iteration
1112 public:
1113 // Iterate over all oop fields in the oop maps.
1114 template <bool nv, class OopClosureType>
1115 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1116
1117 protected:
1118 // Iterate over all oop fields and metadata.
1119 template <bool nv, class OopClosureType>
1120 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1121
1122 private:
1123 // Iterate over all oop fields in the oop maps.
1124 // Specialized for [T = oop] or [T = narrowOop].
1125 template <bool nv, typename T, class OopClosureType>
1126 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1127
1128 // Iterate over all oop fields in one oop map.
1129 template <bool nv, typename T, class OopClosureType>
1130 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1131
1132
1133 public:
1134
1135 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1136 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1137
1138 #if INCLUDE_ALL_GCS
1139 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1140 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1141 #endif // INCLUDE_ALL_GCS
1142
1143 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1144
1145 public:
1146 void set_in_error_state() {
1147 assert(DumpSharedSpaces, "only call this when dumping archive");
1148 _init_state = initialization_error;
1149 }
1150 bool check_sharing_error_state();
1151
1152 private:
1153 // initialization state
1154 #ifdef ASSERT
1155 void set_init_state(ClassState state);
1156 #else
1157 void set_init_state(ClassState state) { _init_state = (u1)state; }
1158 #endif
1159 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1160 void set_init_thread(Thread *thread) { _init_thread = thread; }
1161
1162 // The RedefineClasses() API can cause new method idnums to be needed
1163 // which will cause the caches to grow. Safety requires different
1164 // cache management logic if the caches can grow instead of just
1165 // going from NULL to non-NULL.
1166 bool idnum_can_increment() const { return has_been_redefined(); }
1167 jmethodID* methods_jmethod_ids_acquire() const
1168 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1169 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1170 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1171
1172 // Lock during initialization
1173 public:
1174 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1175 // Must be one per class and it has to be a VM internal object so java code
1176 // cannot lock it (like the mirror).
1177 // It has to be an object not a Mutex because it's held through java calls.
1178 oop init_lock() const;
1179 private:
1180 void fence_and_clear_init_lock();
1181
1182 // Static methods that are used to implement member methods where an exposed this pointer
1183 // is needed due to possible GCs
1184 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1185 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1186 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1187 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1188 static void eager_initialize_impl (instanceKlassHandle this_k);
1189 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1190 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1191 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1192 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1193 /* jni_id_for_impl for jfieldID only */
1194 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1195
1196 // Returns the array class for the n'th dimension
1197 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1198
1199 // Returns the array class with this class as element type
1200 Klass* array_klass_impl(bool or_null, TRAPS);
1201
1202 // find a local method (returns NULL if not found)
1203 Method* find_method_impl(const Symbol* name,
1204 const Symbol* signature,
1205 OverpassLookupMode overpass_mode,
1206 StaticLookupMode static_mode,
1207 PrivateLookupMode private_mode) const;
1208
1209 static Method* find_method_impl(const Array<Method*>* methods,
1210 const Symbol* name,
1211 const Symbol* signature,
1212 OverpassLookupMode overpass_mode,
1213 StaticLookupMode static_mode,
1214 PrivateLookupMode private_mode);
1215
1216 // Free CHeap allocated fields.
1217 void release_C_heap_structures();
1218
1219 // RedefineClasses support
1220 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1221 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1222 public:
1223 // CDS support - remove and restore oops from metadata. Oops are not shared.
1224 virtual void remove_unshareable_info();
1225 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1226
1227 // jvm support
1228 jint compute_modifier_flags(TRAPS) const;
1229
1230 // JSR-292 support
1231 MemberNameTable* member_names() { return _member_names; }
1232 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1233 bool add_member_name(Handle member_name);
1234
1235 public:
1236 // JVMTI support
1237 jint jvmti_class_status() const;
1238
1239 public:
1240 // Printing
1241 #ifndef PRODUCT
1242 void print_on(outputStream* st) const;
1243 #endif
1244 void print_value_on(outputStream* st) const;
1245
1246 void oop_print_value_on(oop obj, outputStream* st);
1247
1248 #ifndef PRODUCT
1249 void oop_print_on (oop obj, outputStream* st);
1250
1251 void print_dependent_nmethods(bool verbose = false);
1252 bool is_dependent_nmethod(nmethod* nm);
1253 #endif
1254
1255 const char* internal_name() const;
1256
1257 // Verification
1258 void verify_on(outputStream* st);
1259
1260 void oop_verify_on(oop obj, outputStream* st);
1261
1262 // Logging
1263 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data, const ClassFileStream* cfs) const;
1264 };
1265
1266 inline Method* InstanceKlass::method_at_vtable(int index) {
1267 #ifndef PRODUCT
1268 assert(index >= 0, "valid vtable index");
1269 if (DebugVtables) {
1270 verify_vtable_index(index);
1271 }
1272 #endif
1273 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1274 return ve[index].method();
1275 }
1276
1277 // for adding methods
1278 // UNSET_IDNUM return means no more ids available
1279 inline u2 InstanceKlass::next_method_idnum() {
1280 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1281 return ConstMethod::UNSET_IDNUM; // no more ids available
1282 } else {
1283 return _idnum_allocated_count++;
1284 }
1285 }
1286
1287
1288 /* JNIid class for jfieldIDs only */
1289 class JNIid: public CHeapObj<mtClass> {
1290 friend class VMStructs;
1291 private:
1292 Klass* _holder;
1293 JNIid* _next;
1294 int _offset;
1295 #ifdef ASSERT
1296 bool _is_static_field_id;
1297 #endif
1298
1299 public:
1300 // Accessors
1301 Klass* holder() const { return _holder; }
1302 int offset() const { return _offset; }
1303 JNIid* next() { return _next; }
1304 // Constructor
1305 JNIid(Klass* holder, int offset, JNIid* next);
1306 // Identifier lookup
1307 JNIid* find(int offset);
1308
1309 bool find_local_field(fieldDescriptor* fd) {
1310 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1311 }
1312
1313 static void deallocate(JNIid* id);
1314 // Debugging
1315 #ifdef ASSERT
1316 bool is_static_field_id() const { return _is_static_field_id; }
1317 void set_is_static_field_id() { _is_static_field_id = true; }
1318 #endif
1319 void verify(Klass* holder);
1320 };
1321
1322 // An iterator that's used to access the inner classes indices in the
1323 // InstanceKlass::_inner_classes array.
1324 class InnerClassesIterator : public StackObj {
1325 private:
1326 Array<jushort>* _inner_classes;
1327 int _length;
1328 int _idx;
1329 public:
1330
1331 InnerClassesIterator(instanceKlassHandle k) {
1332 _inner_classes = k->inner_classes();
1333 if (k->inner_classes() != NULL) {
1334 _length = _inner_classes->length();
1335 // The inner class array's length should be the multiple of
1336 // inner_class_next_offset if it only contains the InnerClasses
1337 // attribute data, or it should be
1338 // n*inner_class_next_offset+enclosing_method_attribute_size
1339 // if it also contains the EnclosingMethod data.
1340 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1341 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1342 "just checking");
1343 // Remove the enclosing_method portion if exists.
1344 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1345 _length -= InstanceKlass::enclosing_method_attribute_size;
1346 }
1347 } else {
1348 _length = 0;
1349 }
1350 _idx = 0;
1351 }
1352
1353 int length() const {
1354 return _length;
1355 }
1356
1357 void next() {
1358 _idx += InstanceKlass::inner_class_next_offset;
1359 }
1360
1361 bool done() const {
1362 return (_idx >= _length);
1363 }
1364
1365 u2 inner_class_info_index() const {
1366 return _inner_classes->at(
1367 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1368 }
1369
1370 void set_inner_class_info_index(u2 index) {
1371 _inner_classes->at_put(
1372 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1373 }
1374
1375 u2 outer_class_info_index() const {
1376 return _inner_classes->at(
1377 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1378 }
1379
1380 void set_outer_class_info_index(u2 index) {
1381 _inner_classes->at_put(
1382 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1383 }
1384
1385 u2 inner_name_index() const {
1386 return _inner_classes->at(
1387 _idx + InstanceKlass::inner_class_inner_name_offset);
1388 }
1389
1390 void set_inner_name_index(u2 index) {
1391 _inner_classes->at_put(
1392 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1393 }
1394
1395 u2 inner_access_flags() const {
1396 return _inner_classes->at(
1397 _idx + InstanceKlass::inner_class_access_flags_offset);
1398 }
1399 };
1400
1401 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP