1 /*
2 * Copyright (c) 1997, 2022, 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_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_OOPS_INSTANCEKLASS_HPP
27
28 #include "memory/referenceType.hpp"
29 #include "oops/annotations.hpp"
30 #include "oops/constMethod.hpp"
31 #include "oops/fieldInfo.hpp"
32 #include "oops/instanceOop.hpp"
33 #include "runtime/handles.hpp"
34 #include "utilities/accessFlags.hpp"
35 #include "utilities/align.hpp"
36 #include "utilities/macros.hpp"
37 #if INCLUDE_JFR
38 #include "jfr/support/jfrKlassExtension.hpp"
39 #endif
40
41 class klassItable;
42 class RecordComponent;
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
54
55 // forward declaration for class -- see below for definition
56 #if INCLUDE_JVMTI
57 class BreakpointInfo;
58 #endif
59 class ClassFileParser;
60 class ClassFileStream;
61 class KlassDepChange;
62 class DependencyContext;
63 class fieldDescriptor;
64 class jniIdMapBase;
65 class JNIid;
66 class JvmtiCachedClassFieldMap;
67 class nmethodBucket;
68 class OopMapCache;
69 class InterpreterOopMap;
70 class PackageEntry;
71 class ModuleEntry;
72
73 // This is used in iterators below.
74 class FieldClosure: public StackObj {
75 public:
76 virtual void do_field(fieldDescriptor* fd) = 0;
77 };
78
79 // Print fields.
80 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
81 class FieldPrinter: public FieldClosure {
82 oop _obj;
83 outputStream* _st;
84 public:
85 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
86 void do_field(fieldDescriptor* fd);
87 };
88
89 // Describes where oops are located in instances of this klass.
90 class OopMapBlock {
91 public:
92 // Byte offset of the first oop mapped by this block.
93 int offset() const { return _offset; }
94 void set_offset(int offset) { _offset = offset; }
95
96 // Number of oops in this block.
97 uint count() const { return _count; }
98 void set_count(uint count) { _count = count; }
99
100 void increment_count(int diff) { _count += diff; }
101
102 int offset_span() const { return _count * heapOopSize; }
103
104 int end_offset() const {
105 return offset() + offset_span();
106 }
107
108 bool is_contiguous(int another_offset) const {
109 return another_offset == end_offset();
110 }
111
112 // sizeof(OopMapBlock) in words.
113 static const int size_in_words() {
114 return align_up((int)sizeof(OopMapBlock), wordSize) >>
115 LogBytesPerWord;
116 }
117
118 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
119 return a->offset() - b->offset();
120 }
121
122 private:
123 int _offset;
124 uint _count;
125 };
126
127 struct JvmtiCachedClassFileData;
128
129 class InstanceKlass: public Klass {
130 friend class VMStructs;
131 friend class JVMCIVMStructs;
132 friend class ClassFileParser;
133 friend class CompileReplay;
134
135 public:
136 static const KlassKind Kind = InstanceKlassKind;
137
138 protected:
139 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE);
140
141 public:
142 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
143
144 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
145 // of the class loading & initialization procedure, and the use of the states.
146 enum ClassState : u1 {
147 allocated, // allocated (but not yet linked)
148 loaded, // loaded and inserted in class hierarchy (but not linked yet)
149 being_linked, // currently running verifier and rewriter
150 linked, // successfully linked/verified (but not initialized yet)
151 being_initialized, // currently running class initializer
152 fully_initialized, // initialized (successful final state)
153 initialization_error // error happened during initialization
154 };
155
156 private:
157 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
158
159 protected:
160 // If you add a new field that points to any metaspace object, you
161 // must add this field to InstanceKlass::metaspace_pointers_do().
162
163 // Annotations for this class
164 Annotations* _annotations;
165 // Package this class is defined in
166 PackageEntry* _package_entry;
167 // Array classes holding elements of this class.
168 ObjArrayKlass* volatile _array_klasses;
169 // Constant pool for this class.
170 ConstantPool* _constants;
171 // The InnerClasses attribute and EnclosingMethod attribute. The
172 // _inner_classes is an array of shorts. If the class has InnerClasses
173 // attribute, then the _inner_classes array begins with 4-tuples of shorts
174 // [inner_class_info_index, outer_class_info_index,
175 // inner_name_index, inner_class_access_flags] for the InnerClasses
176 // attribute. If the EnclosingMethod attribute exists, it occupies the
177 // last two shorts [class_index, method_index] of the array. If only
178 // the InnerClasses attribute exists, the _inner_classes array length is
179 // number_of_inner_classes * 4. If the class has both InnerClasses
180 // and EnclosingMethod attributes the _inner_classes array length is
181 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
182 Array<jushort>* _inner_classes;
183
184 // The NestMembers attribute. An array of shorts, where each is a
185 // class info index for the class that is a nest member. This data
186 // has not been validated.
187 Array<jushort>* _nest_members;
188
189 // Resolved nest-host klass: either true nest-host or self if we are not
190 // nested, or an error occurred resolving or validating the nominated
191 // nest-host. Can also be set directly by JDK API's that establish nest
192 // relationships.
193 // By always being set it makes nest-member access checks simpler.
194 InstanceKlass* _nest_host;
195
196 // The PermittedSubclasses attribute. An array of shorts, where each is a
197 // class info index for the class that is a permitted subclass.
198 Array<jushort>* _permitted_subclasses;
199
200 // The contents of the Record attribute.
201 Array<RecordComponent*>* _record_components;
202
203 // the source debug extension for this klass, NULL if not specified.
204 // Specified as UTF-8 string without terminating zero byte in the classfile,
205 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
206 const char* _source_debug_extension;
207
208 // Number of heapOopSize words used by non-static fields in this klass
209 // (including inherited fields but after header_size()).
210 int _nonstatic_field_size;
211 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
212 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks
213 int _itable_len; // length of Java itable (in words)
214
215 // The NestHost attribute. The class info index for the class
216 // that is the nest-host of this class. This data has not been validated.
217 u2 _nest_host_index;
218 u2 _this_class_index; // constant pool entry
219 u2 _static_oop_field_count; // number of static oop fields in this klass
220 u2 _java_fields_count; // The number of declared Java fields
221
222 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
223
224 // _is_marked_dependent can be set concurrently, thus cannot be part of the
225 // _misc_flags.
226 bool _is_marked_dependent; // used for marking during flushing and deoptimization
227
228 ClassState _init_state; // state of class
229
230 u1 _reference_type; // reference type
231
232 enum {
233 _misc_rewritten = 1 << 0, // methods rewritten.
234 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
235 _misc_should_verify_class = 1 << 2, // allow caching of preverification
236 _misc_unused = 1 << 3, // not currently used
237 _misc_is_contended = 1 << 4, // marked with contended annotation
238 _misc_has_nonstatic_concrete_methods = 1 << 5, // class/superclass/implemented interfaces has non-static, concrete methods
239 _misc_declares_nonstatic_concrete_methods = 1 << 6, // directly declares non-static, concrete methods
240 _misc_has_been_redefined = 1 << 7, // class has been redefined
241 _misc_shared_loading_failed = 1 << 8, // class has been loaded from shared archive
242 _misc_is_scratch_class = 1 << 9, // class is the redefined scratch class
243 _misc_is_shared_boot_class = 1 << 10, // defining class loader is boot class loader
244 _misc_is_shared_platform_class = 1 << 11, // defining class loader is platform class loader
245 _misc_is_shared_app_class = 1 << 12, // defining class loader is app class loader
246 _misc_has_contended_annotations = 1 << 13 // has @Contended annotation
247 };
248 u2 shared_loader_type_bits() const {
249 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
250 }
251 u2 _misc_flags; // There is more space in access_flags for more flags.
252
253 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread.
254 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
255
256 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
257 JNIid* _jni_ids; // First JNI identifier for static fields in this class
258 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
259 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
260 uint64_t volatile _dep_context_last_cleaned;
261 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
262 #if INCLUDE_JVMTI
263 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
264 // Linked instanceKlasses of previous versions
265 InstanceKlass* _previous_versions;
266 // JVMTI fields can be moved to their own structure - see 6315920
267 // JVMTI: cached class file, before retransformable agent modified it in CFLH
268 JvmtiCachedClassFileData* _cached_class_file;
269 #endif
270
271 #if INCLUDE_JVMTI
272 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
273 #endif
274
275 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
276
277 // Method array.
278 Array<Method*>* _methods;
279 // Default Method Array, concrete methods inherited from interfaces
280 Array<Method*>* _default_methods;
281 // Interfaces (InstanceKlass*s) this class declares locally to implement.
282 Array<InstanceKlass*>* _local_interfaces;
283 // Interfaces (InstanceKlass*s) this class implements transitively.
284 Array<InstanceKlass*>* _transitive_interfaces;
285 // Int array containing the original order of method in the class file (for JVMTI).
286 Array<int>* _method_ordering;
287 // Int array containing the vtable_indices for default_methods
288 // offset matches _default_methods offset
289 Array<int>* _default_vtable_indices;
290
291 // Instance and static variable information, starts with 6-tuples of shorts
292 // [access, name index, sig index, initval index, low_offset, high_offset]
293 // for all fields, followed by the generic signature data at the end of
294 // the array. Only fields with generic signature attributes have the generic
295 // signature data set in the array. The fields array looks like following:
296 //
297 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
298 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
299 // ...
300 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
301 // [generic signature index]
302 // [generic signature index]
303 // ...
304 Array<u2>* _fields;
305
306 // embedded Java vtable follows here
307 // embedded Java itables follows here
308 // embedded static fields follows here
309 // embedded nonstatic oop-map blocks follows here
310 // embedded implementor of this interface follows here
311 // The embedded implementor only exists if the current klass is an
312 // interface. The possible values of the implementor fall into following
313 // three cases:
314 // NULL: no implementor.
315 // A Klass* that's not itself: one implementor.
316 // Itself: more than one implementors.
317 //
318
319 friend class SystemDictionary;
320
321 static bool _disable_method_binary_search;
322
323 // Controls finalizer registration
324 static bool _finalization_enabled;
325
326 public:
327
328 // Queries finalization state
329 static bool is_finalization_enabled() { return _finalization_enabled; }
330
331 // Sets finalization state
332 static void set_finalization_enabled(bool val) { _finalization_enabled = val; }
333
334 // The three BUILTIN class loader types
335 bool is_shared_boot_class() const {
336 return (_misc_flags & _misc_is_shared_boot_class) != 0;
337 }
338 bool is_shared_platform_class() const {
339 return (_misc_flags & _misc_is_shared_platform_class) != 0;
340 }
341 bool is_shared_app_class() const {
342 return (_misc_flags & _misc_is_shared_app_class) != 0;
343 }
344 // The UNREGISTERED class loader type
345 bool is_shared_unregistered_class() const {
346 return (_misc_flags & shared_loader_type_bits()) == 0;
347 }
348
349 // Check if the class can be shared in CDS
350 bool is_shareable() const;
351
352 bool shared_loading_failed() const {
353 return (_misc_flags & _misc_shared_loading_failed) != 0;
354 }
355
356 void set_shared_loading_failed() {
357 _misc_flags |= _misc_shared_loading_failed;
358 }
359
360 void set_shared_class_loader_type(s2 loader_type);
361
362 void assign_class_loader_type();
363
364 bool has_nonstatic_fields() const {
365 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
366 }
367 void set_has_nonstatic_fields(bool b) {
368 assert(!has_nonstatic_fields(), "set once");
369 if (b) {
370 _misc_flags |= _misc_has_nonstatic_fields;
371 }
372 }
373
374 // field sizes
375 int nonstatic_field_size() const { return _nonstatic_field_size; }
376 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
377
378 int static_field_size() const { return _static_field_size; }
379 void set_static_field_size(int size) { _static_field_size = size; }
380
381 int static_oop_field_count() const { return (int)_static_oop_field_count; }
382 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
383
384 // Java itable
385 int itable_length() const { return _itable_len; }
386 void set_itable_length(int len) { _itable_len = len; }
387
388 // array klasses
389 ObjArrayKlass* array_klasses() const { return _array_klasses; }
390 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics
391 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics
392
393 // methods
394 Array<Method*>* methods() const { return _methods; }
395 void set_methods(Array<Method*>* a) { _methods = a; }
396 Method* method_with_idnum(int idnum);
397 Method* method_with_orig_idnum(int idnum);
398 Method* method_with_orig_idnum(int idnum, int version);
399
400 // method ordering
401 Array<int>* method_ordering() const { return _method_ordering; }
402 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
403 void copy_method_ordering(const intArray* m, TRAPS);
404
405 // default_methods
406 Array<Method*>* default_methods() const { return _default_methods; }
407 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
408
409 // default method vtable_indices
410 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
411 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
412 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
413
414 // interfaces
415 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
416 void set_local_interfaces(Array<InstanceKlass*>* a) {
417 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
418 _local_interfaces = a; }
419
420 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
421 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
422 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
423 _transitive_interfaces = a;
424 }
425
426 private:
427 friend class fieldDescriptor;
428 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
429
430 public:
431 int field_offset (int index) const { return field(index)->offset(); }
432 int field_access_flags(int index) const { return field(index)->access_flags(); }
433 Symbol* field_name (int index) const { return field(index)->name(constants()); }
434 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
435
436 // Number of Java declared fields
437 int java_fields_count() const { return (int)_java_fields_count; }
438
439 Array<u2>* fields() const { return _fields; }
440 void set_fields(Array<u2>* f, u2 java_fields_count) {
441 guarantee(_fields == NULL || f == NULL, "Just checking");
442 _fields = f;
443 _java_fields_count = java_fields_count;
444 }
445
446 // inner classes
447 Array<u2>* inner_classes() const { return _inner_classes; }
448 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
449
450 // nest members
451 Array<u2>* nest_members() const { return _nest_members; }
452 void set_nest_members(Array<u2>* m) { _nest_members = m; }
453
454 // nest-host index
455 jushort nest_host_index() const { return _nest_host_index; }
456 void set_nest_host_index(u2 i) { _nest_host_index = i; }
457 // dynamic nest member support
458 void set_nest_host(InstanceKlass* host);
459
460 // record components
461 Array<RecordComponent*>* record_components() const { return _record_components; }
462 void set_record_components(Array<RecordComponent*>* record_components) {
463 _record_components = record_components;
464 }
465 bool is_record() const;
466
467 // permitted subclasses
468 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; }
469 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; }
470
471 private:
472 // Called to verify that k is a member of this nest - does not look at k's nest-host,
473 // nor does it resolve any CP entries or load any classes.
474 bool has_nest_member(JavaThread* current, InstanceKlass* k) const;
475
476 public:
477 // Call this only if you know that the nest host has been initialized.
478 InstanceKlass* nest_host_not_null() {
479 assert(_nest_host != NULL, "must be");
480 return _nest_host;
481 }
482 // Used to construct informative IllegalAccessError messages at a higher level,
483 // if there was an issue resolving or validating the nest host.
484 // Returns NULL if there was no error.
485 const char* nest_host_error();
486 // Returns nest-host class, resolving and validating it if needed.
487 // Returns NULL if resolution is not possible from the calling context.
488 InstanceKlass* nest_host(TRAPS);
489 // Check if this klass is a nestmate of k - resolves this nest-host and k's
490 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
491
492 // Called to verify that k is a permitted subclass of this class
493 bool has_as_permitted_subclass(const InstanceKlass* k) const;
494
495 enum InnerClassAttributeOffset {
496 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
497 inner_class_inner_class_info_offset = 0,
498 inner_class_outer_class_info_offset = 1,
499 inner_class_inner_name_offset = 2,
500 inner_class_access_flags_offset = 3,
501 inner_class_next_offset = 4
502 };
503
504 enum EnclosingMethodAttributeOffset {
505 enclosing_method_class_index_offset = 0,
506 enclosing_method_method_index_offset = 1,
507 enclosing_method_attribute_size = 2
508 };
509
510 // package
511 PackageEntry* package() const { return _package_entry; }
512 ModuleEntry* module() const;
513 bool in_unnamed_package() const { return (_package_entry == NULL); }
514 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS);
515 // If the package for the InstanceKlass is in the boot loader's package entry
516 // table then sets the classpath_index field so that
517 // get_system_package() will know to return a non-null value for the
518 // package's location. And, so that the package will be added to the list of
519 // packages returned by get_system_packages().
520 // For packages whose classes are loaded from the boot loader class path, the
521 // classpath_index indicates which entry on the boot loader class path.
522 void set_classpath_index(s2 path_index);
523 bool is_same_class_package(const Klass* class2) const;
524 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
525
526 // find an enclosing class
527 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
528
529 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
530 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
531
532 private:
533 // Check prohibited package ("java/" only loadable by boot or platform loaders)
534 static void check_prohibited_package(Symbol* class_name,
535 ClassLoaderData* loader_data,
536 TRAPS);
537 public:
538 // initialization state
539 bool is_loaded() const { return init_state() >= loaded; }
540 bool is_linked() const { return init_state() >= linked; }
541 bool is_being_linked() const { return init_state() == being_linked; }
542 bool is_initialized() const { return init_state() == fully_initialized; }
543 bool is_not_initialized() const { return init_state() < being_initialized; }
544 bool is_being_initialized() const { return init_state() == being_initialized; }
545 bool is_in_error_state() const { return init_state() == initialization_error; }
546 bool is_init_thread(Thread *thread) { return thread == _init_thread; }
547 ClassState init_state() const { return Atomic::load(&_init_state); }
548 const char* init_state_name() const;
549 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
550
551 class LockLinkState : public StackObj {
552 InstanceKlass* _ik;
553 JavaThread* _current;
554 public:
555 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) {
556 ik->check_link_state_and_wait(current);
557 }
558 ~LockLinkState() {
559 if (!_ik->is_linked()) {
560 // Reset to loaded if linking failed.
561 _ik->set_initialization_state_and_notify(loaded, _current);
562 }
563 }
564 };
565
566 // is this a sealed class
567 bool is_sealed() const;
568
569 // defineClass specified verification
570 bool should_verify_class() const {
571 return (_misc_flags & _misc_should_verify_class) != 0;
572 }
573 void set_should_verify_class(bool value) {
574 assert(!should_verify_class(), "set once");
575 if (value) {
576 _misc_flags |= _misc_should_verify_class;
577 }
578 }
579
580 // marking
581 bool is_marked_dependent() const { return _is_marked_dependent; }
582 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
583
584 // initialization (virtuals from Klass)
585 bool should_be_initialized() const; // means that initialize should be called
586 void initialize(TRAPS);
587 void link_class(TRAPS);
588 bool link_class_or_fail(TRAPS); // returns false on failure
589 void rewrite_class(TRAPS);
590 void link_methods(TRAPS);
591 Method* class_initializer() const;
592
593 // reference type
594 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
595
596 // this class cp index
597 u2 this_class_index() const { return _this_class_index; }
598 void set_this_class_index(u2 index) { _this_class_index = index; }
599
600 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
601
602 // find local field, returns true if found
603 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
604 // find field in direct superinterfaces, returns the interface in which the field is defined
605 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
606 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
607 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
608 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
609 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
610
611 // find a non-static or static field given its offset within the class.
612 bool contains_field_offset(int offset);
613
614 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
615 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
616
617 private:
618 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
619
620 public:
621 static void disable_method_binary_search() {
622 _disable_method_binary_search = true;
623 }
624
625 // find a local method (returns NULL if not found)
626 Method* find_method(const Symbol* name, const Symbol* signature) const;
627 static Method* find_method(const Array<Method*>* methods,
628 const Symbol* name,
629 const Symbol* signature);
630
631 // find a local method, but skip static methods
632 Method* find_instance_method(const Symbol* name, const Symbol* signature,
633 PrivateLookupMode private_mode) const;
634 static Method* find_instance_method(const Array<Method*>* methods,
635 const Symbol* name,
636 const Symbol* signature,
637 PrivateLookupMode private_mode);
638
639 // find a local method (returns NULL if not found)
640 Method* find_local_method(const Symbol* name,
641 const Symbol* signature,
642 OverpassLookupMode overpass_mode,
643 StaticLookupMode static_mode,
644 PrivateLookupMode private_mode) const;
645
646 // find a local method from given methods array (returns NULL if not found)
647 static Method* find_local_method(const Array<Method*>* methods,
648 const Symbol* name,
649 const Symbol* signature,
650 OverpassLookupMode overpass_mode,
651 StaticLookupMode static_mode,
652 PrivateLookupMode private_mode);
653
654 // find a local method index in methods or default_methods (returns -1 if not found)
655 static int find_method_index(const Array<Method*>* methods,
656 const Symbol* name,
657 const Symbol* signature,
658 OverpassLookupMode overpass_mode,
659 StaticLookupMode static_mode,
660 PrivateLookupMode private_mode);
661
662 // lookup operation (returns NULL if not found)
663 Method* uncached_lookup_method(const Symbol* name,
664 const Symbol* signature,
665 OverpassLookupMode overpass_mode,
666 PrivateLookupMode private_mode = PrivateLookupMode::find) const;
667
668 // lookup a method in all the interfaces that this class implements
669 // (returns NULL if not found)
670 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
671
672 // lookup a method in local defaults then in all interfaces
673 // (returns NULL if not found)
674 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
675
676 // Find method indices by name. If a method with the specified name is
677 // found the index to the first method is returned, and 'end' is filled in
678 // with the index of first non-name-matching method. If no method is found
679 // -1 is returned.
680 int find_method_by_name(const Symbol* name, int* end) const;
681 static int find_method_by_name(const Array<Method*>* methods,
682 const Symbol* name, int* end);
683
684 // constant pool
685 ConstantPool* constants() const { return _constants; }
686 void set_constants(ConstantPool* c) { _constants = c; }
687
688 // protection domain
689 oop protection_domain() const;
690
691 // signers
692 objArrayOop signers() const;
693
694 bool is_contended() const {
695 return (_misc_flags & _misc_is_contended) != 0;
696 }
697 void set_is_contended(bool value) {
698 assert(!is_contended(), "set once");
699 if (value) {
700 _misc_flags |= _misc_is_contended;
701 }
702 }
703
704 // source file name
705 Symbol* source_file_name() const { return _constants->source_file_name(); }
706 u2 source_file_name_index() const { return _constants->source_file_name_index(); }
707 void set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
708
709 // minor and major version numbers of class file
710 u2 minor_version() const { return _constants->minor_version(); }
711 void set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
712 u2 major_version() const { return _constants->major_version(); }
713 void set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
714
715 // source debug extension
716 const char* source_debug_extension() const { return _source_debug_extension; }
717 void set_source_debug_extension(const char* array, int length);
718
719 // nonstatic oop-map blocks
720 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
721 return oop_map_count * OopMapBlock::size_in_words();
722 }
723 unsigned int nonstatic_oop_map_count() const {
724 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
725 }
726 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
727 void set_nonstatic_oop_map_size(int words) {
728 _nonstatic_oop_map_size = words;
729 }
730
731 bool has_contended_annotations() const {
732 return ((_misc_flags & _misc_has_contended_annotations) != 0);
733 }
734 void set_has_contended_annotations(bool value) {
735 assert(!has_contended_annotations(), "set once");
736 if (value) {
737 _misc_flags |= _misc_has_contended_annotations;
738 }
739 }
740
741 #if INCLUDE_JVMTI
742 // Redefinition locking. Class can only be redefined by one thread at a time.
743 // The flag is in access_flags so that it can be set and reset using atomic
744 // operations, and not be reset by other misc_flag settings.
745 bool is_being_redefined() const {
746 return _access_flags.is_being_redefined();
747 }
748 void set_is_being_redefined(bool value) {
749 if (value) {
750 _access_flags.set_is_being_redefined();
751 } else {
752 _access_flags.clear_is_being_redefined();
753 }
754 }
755
756 // RedefineClasses() support for previous versions:
757 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
758 void purge_previous_version_list();
759
760 InstanceKlass* previous_versions() const { return _previous_versions; }
761 #else
762 InstanceKlass* previous_versions() const { return NULL; }
763 #endif
764
765 InstanceKlass* get_klass_version(int version) {
766 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
767 if (ik->constants()->version() == version) {
768 return ik;
769 }
770 }
771 return NULL;
772 }
773
774 bool has_been_redefined() const {
775 return (_misc_flags & _misc_has_been_redefined) != 0;
776 }
777 void set_has_been_redefined() {
778 _misc_flags |= _misc_has_been_redefined;
779 }
780
781 bool is_scratch_class() const {
782 return (_misc_flags & _misc_is_scratch_class) != 0;
783 }
784
785 void set_is_scratch_class() {
786 _misc_flags |= _misc_is_scratch_class;
787 }
788
789 bool has_resolved_methods() const {
790 return _access_flags.has_resolved_methods();
791 }
792
793 void set_has_resolved_methods() {
794 _access_flags.set_has_resolved_methods();
795 }
796
797 public:
798 #if INCLUDE_JVMTI
799
800 void init_previous_versions() {
801 _previous_versions = NULL;
802 }
803
804 private:
805 static bool _has_previous_versions;
806 public:
807 static void purge_previous_versions(InstanceKlass* ik) {
808 if (ik->has_been_redefined()) {
809 ik->purge_previous_version_list();
810 }
811 }
812
813 static bool has_previous_versions_and_reset();
814 static bool has_previous_versions() { return _has_previous_versions; }
815
816 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
817 void set_cached_class_file(JvmtiCachedClassFileData *data) {
818 _cached_class_file = data;
819 }
820 JvmtiCachedClassFileData * get_cached_class_file();
821 jint get_cached_class_file_len();
822 unsigned char * get_cached_class_file_bytes();
823
824 // JVMTI: Support for caching of field indices, types, and offsets
825 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
826 _jvmti_cached_class_field_map = descriptor;
827 }
828 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
829 return _jvmti_cached_class_field_map;
830 }
831 #else // INCLUDE_JVMTI
832
833 static void purge_previous_versions(InstanceKlass* ik) { return; };
834 static bool has_previous_versions_and_reset() { return false; }
835
836 void set_cached_class_file(JvmtiCachedClassFileData *data) {
837 assert(data == NULL, "unexpected call with JVMTI disabled");
838 }
839 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
840
841 #endif // INCLUDE_JVMTI
842
843 bool has_nonstatic_concrete_methods() const {
844 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
845 }
846 void set_has_nonstatic_concrete_methods(bool b) {
847 assert(!has_nonstatic_concrete_methods(), "set once");
848 if (b) {
849 _misc_flags |= _misc_has_nonstatic_concrete_methods;
850 }
851 }
852
853 bool declares_nonstatic_concrete_methods() const {
854 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
855 }
856 void set_declares_nonstatic_concrete_methods(bool b) {
857 assert(!declares_nonstatic_concrete_methods(), "set once");
858 if (b) {
859 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
860 }
861 }
862
863 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
864 inline u2 next_method_idnum();
865 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
866
867 // generics support
868 Symbol* generic_signature() const { return _constants->generic_signature(); }
869 u2 generic_signature_index() const { return _constants->generic_signature_index(); }
870 void set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
871
872 u2 enclosing_method_data(int offset) const;
873 u2 enclosing_method_class_index() const {
874 return enclosing_method_data(enclosing_method_class_index_offset);
875 }
876 u2 enclosing_method_method_index() {
877 return enclosing_method_data(enclosing_method_method_index_offset);
878 }
879 void set_enclosing_method_indices(u2 class_index,
880 u2 method_index);
881
882 // jmethodID support
883 jmethodID get_jmethod_id(const methodHandle& method_h);
884 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
885 jmethodID new_id, jmethodID* new_jmeths,
886 jmethodID* to_dealloc_id_p,
887 jmethodID** to_dealloc_jmeths_p);
888 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
889 size_t *length_p, jmethodID* id_p);
890 void ensure_space_for_methodids(int start_offset = 0);
891 jmethodID jmethod_id_or_null(Method* method);
892
893 // annotations support
894 Annotations* annotations() const { return _annotations; }
895 void set_annotations(Annotations* anno) { _annotations = anno; }
896
897 AnnotationArray* class_annotations() const {
898 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
899 }
900 Array<AnnotationArray*>* fields_annotations() const {
901 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
902 }
903 AnnotationArray* class_type_annotations() const {
904 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
905 }
906 Array<AnnotationArray*>* fields_type_annotations() const {
907 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
908 }
909 // allocation
910 instanceOop allocate_instance(TRAPS);
911 static instanceOop allocate_instance(oop cls, TRAPS);
912
913 // additional member function to return a handle
914 instanceHandle allocate_instance_handle(TRAPS);
915
916 objArrayOop allocate_objArray(int n, int length, TRAPS);
917 // Helper function
918 static instanceOop register_finalizer(instanceOop i, TRAPS);
919
920 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
921 // if not, throw either an Error or an Exception.
922 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
923
924 // initialization
925 void call_class_initializer(TRAPS);
926 void set_initialization_state_and_notify(ClassState state, JavaThread* current);
927
928 // OopMapCache support
929 OopMapCache* oop_map_cache() { return _oop_map_cache; }
930 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
931 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
932
933 // JNI identifier support (for static fields - for jni performance)
934 JNIid* jni_ids() { return _jni_ids; }
935 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
936 JNIid* jni_id_for(int offset);
937
938 // maintenance of deoptimization dependencies
939 inline DependencyContext dependencies();
940 int mark_dependent_nmethods(KlassDepChange& changes);
941 void add_dependent_nmethod(nmethod* nm);
942 void remove_dependent_nmethod(nmethod* nm);
943 void clean_dependency_context();
944
945 // On-stack replacement support
946 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
947 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
948 void add_osr_nmethod(nmethod* n);
949 bool remove_osr_nmethod(nmethod* n);
950 int mark_osr_nmethods(const Method* m);
951 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
952
953 #if INCLUDE_JVMTI
954 // Breakpoint support (see methods on Method* for details)
955 BreakpointInfo* breakpoints() const { return _breakpoints; };
956 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
957 #endif
958
959 // support for stub routines
960 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
961 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
962 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
963
964 // subclass/subinterface checks
965 bool implements_interface(Klass* k) const;
966 bool is_same_or_direct_interface(Klass* k) const;
967
968 #ifdef ASSERT
969 // check whether this class or one of its superclasses was redefined
970 bool has_redefined_this_or_super() const;
971 #endif
972
973 // Access to the implementor of an interface.
974 InstanceKlass* implementor() const;
975 void set_implementor(InstanceKlass* ik);
976 int nof_implementors() const;
977 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
978 void init_implementor(); // initialize
979
980 // link this class into the implementors list of every interface it implements
981 void process_interfaces();
982
983 // virtual operations from Klass
984 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
985 Array<InstanceKlass*>* transitive_interfaces);
986 bool can_be_primary_super_slow() const;
987 size_t oop_size(oop obj) const { return size_helper(); }
988 // slow because it's a virtual call and used for verifying the layout_helper.
989 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
990 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
991
992 // Iterators
993 void do_local_static_fields(FieldClosure* cl);
994 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
995 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
996 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields
997
998 void methods_do(void f(Method* method));
999
1000 static InstanceKlass* cast(Klass* k) {
1001 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1002 }
1003
1004 static const InstanceKlass* cast(const Klass* k) {
1005 assert(k != NULL, "k should not be null");
1006 assert(k->is_instance_klass(), "cast to InstanceKlass");
1007 return static_cast<const InstanceKlass*>(k);
1008 }
1009
1010 virtual InstanceKlass* java_super() const {
1011 return (super() == NULL) ? NULL : cast(super());
1012 }
1013
1014 // Sizing (in words)
1015 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1016
1017 static int size(int vtable_length, int itable_length,
1018 int nonstatic_oop_map_size,
1019 bool is_interface) {
1020 return align_metadata_size(header_size() +
1021 vtable_length +
1022 itable_length +
1023 nonstatic_oop_map_size +
1024 (is_interface ? (int)sizeof(Klass*)/wordSize : 0));
1025 }
1026
1027 int size() const { return size(vtable_length(),
1028 itable_length(),
1029 nonstatic_oop_map_size(),
1030 is_interface());
1031 }
1032
1033
1034 inline intptr_t* start_of_itable() const;
1035 inline intptr_t* end_of_itable() const;
1036 inline int itable_offset_in_words() const;
1037 inline oop static_field_base_raw();
1038
1039 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
1040 inline Klass** end_of_nonstatic_oop_maps() const;
1041
1042 inline InstanceKlass* volatile* adr_implementor() const;
1043
1044 // Use this to return the size of an instance in heap words:
1045 int size_helper() const {
1046 return layout_helper_to_size_helper(layout_helper());
1047 }
1048
1049 // This bit is initialized in classFileParser.cpp.
1050 // It is false under any of the following conditions:
1051 // - the class is abstract (including any interface)
1052 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1053 // - the class size is larger than FastAllocateSizeLimit
1054 // - the class is java/lang/Class, which cannot be allocated directly
1055 bool can_be_fastpath_allocated() const {
1056 return !layout_helper_needs_slow_path(layout_helper());
1057 }
1058
1059 // Java itable
1060 klassItable itable() const; // return klassItable wrapper
1061 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
1062 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
1063 int vtable_index_of_interface_method(Method* method);
1064
1065 #if INCLUDE_JVMTI
1066 void adjust_default_methods(bool* trace_name_printed);
1067 #endif // INCLUDE_JVMTI
1068
1069 void clean_weak_instanceklass_links();
1070 private:
1071 void clean_implementors_list();
1072 void clean_method_data();
1073
1074 public:
1075 // Explicit metaspace deallocation of fields
1076 // For RedefineClasses and class file parsing errors, we need to deallocate
1077 // instanceKlasses and the metadata they point to.
1078 void deallocate_contents(ClassLoaderData* loader_data);
1079 static void deallocate_methods(ClassLoaderData* loader_data,
1080 Array<Method*>* methods);
1081 void static deallocate_interfaces(ClassLoaderData* loader_data,
1082 const Klass* super_klass,
1083 Array<InstanceKlass*>* local_interfaces,
1084 Array<InstanceKlass*>* transitive_interfaces);
1085 void static deallocate_record_components(ClassLoaderData* loader_data,
1086 Array<RecordComponent*>* record_component);
1087
1088 // The constant pool is on stack if any of the methods are executing or
1089 // referenced by handles.
1090 bool on_stack() const { return _constants->on_stack(); }
1091
1092 // callbacks for actions during class unloading
1093 static void unload_class(InstanceKlass* ik);
1094
1095 virtual void release_C_heap_structures(bool release_constant_pool = true);
1096
1097 // Naming
1098 const char* signature_name() const;
1099
1100 // Oop fields (and metadata) iterators
1101 //
1102 // The InstanceKlass iterators also visits the Object's klass.
1103
1104 // Forward iteration
1105 public:
1106 // Iterate over all oop fields in the oop maps.
1107 template <typename T, class OopClosureType>
1108 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1109
1110 // Iterate over all oop fields and metadata.
1111 template <typename T, class OopClosureType>
1112 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1113
1114 // Iterate over all oop fields in one oop map.
1115 template <typename T, class OopClosureType>
1116 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1117
1118
1119 // Reverse iteration
1120 // Iterate over all oop fields and metadata.
1121 template <typename T, class OopClosureType>
1122 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1123
1124 private:
1125 // Iterate over all oop fields in the oop maps.
1126 template <typename T, class OopClosureType>
1127 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1128
1129 // Iterate over all oop fields in one oop map.
1130 template <typename T, class OopClosureType>
1131 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1132
1133
1134 // Bounded range iteration
1135 public:
1136 // Iterate over all oop fields in the oop maps.
1137 template <typename T, class OopClosureType>
1138 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1139
1140 // Iterate over all oop fields and metadata.
1141 template <typename T, class OopClosureType>
1142 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1143
1144 private:
1145 // Iterate over all oop fields in one oop map.
1146 template <typename T, class OopClosureType>
1147 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1148
1149
1150 public:
1151 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1152
1153 private:
1154 // initialization state
1155 void set_init_state(ClassState state);
1156 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1157 void set_init_thread(Thread *thread) {
1158 assert(thread == nullptr || _init_thread == nullptr, "Only one thread is allowed to own initialization");
1159 _init_thread = thread;
1160 }
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 inline jmethodID* methods_jmethod_ids_acquire() const;
1168 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1169
1170 // Lock during initialization
1171 public:
1172 // Returns the array class for the n'th dimension
1173 virtual Klass* array_klass(int n, TRAPS);
1174 virtual Klass* array_klass_or_null(int n);
1175
1176 // Returns the array class with this class as element type
1177 virtual Klass* array_klass(TRAPS);
1178 virtual Klass* array_klass_or_null();
1179
1180 static void clean_initialization_error_table();
1181
1182 Monitor* init_monitor() const { return _init_monitor; }
1183 private:
1184 void check_link_state_and_wait(JavaThread* current);
1185 bool link_class_impl (TRAPS);
1186 bool verify_code (TRAPS);
1187 void initialize_impl (TRAPS);
1188 void initialize_super_interfaces (TRAPS);
1189
1190 void add_initialization_error(JavaThread* current, Handle exception);
1191 oop get_initialization_error(JavaThread* current);
1192
1193 // find a local method (returns NULL if not found)
1194 Method* find_method_impl(const Symbol* name,
1195 const Symbol* signature,
1196 OverpassLookupMode overpass_mode,
1197 StaticLookupMode static_mode,
1198 PrivateLookupMode private_mode) const;
1199
1200 static Method* find_method_impl(const Array<Method*>* methods,
1201 const Symbol* name,
1202 const Symbol* signature,
1203 OverpassLookupMode overpass_mode,
1204 StaticLookupMode static_mode,
1205 PrivateLookupMode private_mode);
1206
1207 #if INCLUDE_JVMTI
1208 // RedefineClasses support
1209 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1210 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1211 #endif
1212 // log class name to classlist
1213 void log_to_classlist() const;
1214 public:
1215 // CDS support - remove and restore oops from metadata. Oops are not shared.
1216 virtual void remove_unshareable_info();
1217 virtual void remove_java_mirror();
1218 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS);
1219 void init_shared_package_entry();
1220 bool can_be_verified_at_dumptime() const;
1221
1222 jint compute_modifier_flags() const;
1223
1224 public:
1225 // JVMTI support
1226 jint jvmti_class_status() const;
1227
1228 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1229
1230 public:
1231 // Printing
1232 void print_on(outputStream* st) const;
1233 void print_value_on(outputStream* st) const;
1234
1235 void oop_print_value_on(oop obj, outputStream* st);
1236
1237 void oop_print_on (oop obj, outputStream* st);
1238
1239 #ifndef PRODUCT
1240 void print_dependent_nmethods(bool verbose = false);
1241 bool is_dependent_nmethod(nmethod* nm);
1242 bool verify_itable_index(int index);
1243 #endif
1244
1245 const char* internal_name() const;
1246
1247 // Verification
1248 void verify_on(outputStream* st);
1249
1250 void oop_verify_on(oop obj, outputStream* st);
1251
1252 // Logging
1253 void print_class_load_logging(ClassLoaderData* loader_data,
1254 const ModuleEntry* module_entry,
1255 const ClassFileStream* cfs) const;
1256 };
1257
1258 // for adding methods
1259 // UNSET_IDNUM return means no more ids available
1260 inline u2 InstanceKlass::next_method_idnum() {
1261 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1262 return ConstMethod::UNSET_IDNUM; // no more ids available
1263 } else {
1264 return _idnum_allocated_count++;
1265 }
1266 }
1267
1268 class PrintClassClosure : public KlassClosure {
1269 private:
1270 outputStream* _st;
1271 bool _verbose;
1272 public:
1273 PrintClassClosure(outputStream* st, bool verbose);
1274
1275 void do_klass(Klass* k);
1276 };
1277
1278 /* JNIid class for jfieldIDs only */
1279 class JNIid: public CHeapObj<mtClass> {
1280 friend class VMStructs;
1281 private:
1282 Klass* _holder;
1283 JNIid* _next;
1284 int _offset;
1285 #ifdef ASSERT
1286 bool _is_static_field_id;
1287 #endif
1288
1289 public:
1290 // Accessors
1291 Klass* holder() const { return _holder; }
1292 int offset() const { return _offset; }
1293 JNIid* next() { return _next; }
1294 // Constructor
1295 JNIid(Klass* holder, int offset, JNIid* next);
1296 // Identifier lookup
1297 JNIid* find(int offset);
1298
1299 bool find_local_field(fieldDescriptor* fd) {
1300 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1301 }
1302
1303 static void deallocate(JNIid* id);
1304 // Debugging
1305 #ifdef ASSERT
1306 bool is_static_field_id() const { return _is_static_field_id; }
1307 void set_is_static_field_id() { _is_static_field_id = true; }
1308 #endif
1309 void verify(Klass* holder);
1310 };
1311
1312 // An iterator that's used to access the inner classes indices in the
1313 // InstanceKlass::_inner_classes array.
1314 class InnerClassesIterator : public StackObj {
1315 private:
1316 Array<jushort>* _inner_classes;
1317 int _length;
1318 int _idx;
1319 public:
1320
1321 InnerClassesIterator(const InstanceKlass* k) {
1322 _inner_classes = k->inner_classes();
1323 if (k->inner_classes() != NULL) {
1324 _length = _inner_classes->length();
1325 // The inner class array's length should be the multiple of
1326 // inner_class_next_offset if it only contains the InnerClasses
1327 // attribute data, or it should be
1328 // n*inner_class_next_offset+enclosing_method_attribute_size
1329 // if it also contains the EnclosingMethod data.
1330 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1331 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1332 "just checking");
1333 // Remove the enclosing_method portion if exists.
1334 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1335 _length -= InstanceKlass::enclosing_method_attribute_size;
1336 }
1337 } else {
1338 _length = 0;
1339 }
1340 _idx = 0;
1341 }
1342
1343 int length() const {
1344 return _length;
1345 }
1346
1347 void next() {
1348 _idx += InstanceKlass::inner_class_next_offset;
1349 }
1350
1351 bool done() const {
1352 return (_idx >= _length);
1353 }
1354
1355 u2 inner_class_info_index() const {
1356 return _inner_classes->at(
1357 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1358 }
1359
1360 void set_inner_class_info_index(u2 index) {
1361 _inner_classes->at_put(
1362 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1363 }
1364
1365 u2 outer_class_info_index() const {
1366 return _inner_classes->at(
1367 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1368 }
1369
1370 void set_outer_class_info_index(u2 index) {
1371 _inner_classes->at_put(
1372 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1373 }
1374
1375 u2 inner_name_index() const {
1376 return _inner_classes->at(
1377 _idx + InstanceKlass::inner_class_inner_name_offset);
1378 }
1379
1380 void set_inner_name_index(u2 index) {
1381 _inner_classes->at_put(
1382 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1383 }
1384
1385 u2 inner_access_flags() const {
1386 return _inner_classes->at(
1387 _idx + InstanceKlass::inner_class_access_flags_offset);
1388 }
1389 };
1390
1391 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal.
1392 // Usage:
1393 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) {
1394 // Klass* k = iter.klass();
1395 // ...
1396 // }
1397 class ClassHierarchyIterator : public StackObj {
1398 private:
1399 InstanceKlass* _root;
1400 Klass* _current;
1401 bool _visit_subclasses;
1402
1403 public:
1404 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) {
1405 assert(_root == _current, "required"); // initial state
1406 }
1407
1408 bool done() {
1409 return (_current == NULL);
1410 }
1411
1412 // Make a step iterating over the class hierarchy under the root class.
1413 // Skips subclasses if requested.
1414 void next();
1415
1416 Klass* klass() {
1417 assert(!done(), "sanity");
1418 return _current;
1419 }
1420
1421 // Skip subclasses of the current class.
1422 void skip_subclasses() {
1423 _visit_subclasses = false;
1424 }
1425 };
1426
1427 #endif // SHARE_OOPS_INSTANCEKLASS_HPP