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