1 /*
2 * Copyright (c) 1997, 2025, 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/allocation.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceKlassFlags.hpp"
34 #include "oops/instanceOop.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/javaThread.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/growableArray.hpp"
40 #include "utilities/macros.hpp"
41 #if INCLUDE_JFR
42 #include "jfr/support/jfrKlassExtension.hpp"
43 #endif
44
45 class ConstantPool;
46 class DeoptimizationScope;
47 class klassItable;
48 class RecordComponent;
49
50 // An InstanceKlass is the VM level representation of a Java class.
51 // It contains all information needed for at class at execution runtime.
52
53 // InstanceKlass embedded field layout (after declared fields):
54 // [EMBEDDED Java vtable ] size in words = vtable_len
55 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
56 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
57 // indicating where oops are located in instances of this klass.
58 // [EMBEDDED implementor of the interface] only exist for interface
59
60
61 // forward declaration for class -- see below for definition
62 #if INCLUDE_JVMTI
63 class BreakpointInfo;
64 #endif
65 class ClassFileParser;
66 class ClassFileStream;
67 class KlassDepChange;
68 class DependencyContext;
69 class fieldDescriptor;
70 class JNIid;
71 class JvmtiCachedClassFieldMap;
72 class nmethodBucket;
73 class OopMapCache;
74 class InterpreterOopMap;
75 class PackageEntry;
76 class ModuleEntry;
77
78 // This is used in iterators below.
79 class FieldClosure: public StackObj {
80 public:
81 virtual void do_field(fieldDescriptor* fd) = 0;
82 };
83
84 // Print fields.
85 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields.
86 class FieldPrinter: public FieldClosure {
87 oop _obj;
88 outputStream* _st;
89 public:
90 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {}
91 void do_field(fieldDescriptor* fd);
92 };
93
94 // Describes where oops are located in instances of this klass.
95 class OopMapBlock {
96 public:
97 // Byte offset of the first oop mapped by this block.
98 int offset() const { return _offset; }
99 void set_offset(int offset) { _offset = offset; }
100
101 // Number of oops in this block.
102 uint count() const { return _count; }
103 void set_count(uint count) { _count = count; }
104
105 void increment_count(int diff) { _count += diff; }
106
107 int offset_span() const { return _count * heapOopSize; }
108
109 int end_offset() const {
110 return offset() + offset_span();
111 }
112
113 bool is_contiguous(int another_offset) const {
114 return another_offset == end_offset();
115 }
116
117 // sizeof(OopMapBlock) in words.
118 static int size_in_words() {
119 return align_up((int)sizeof(OopMapBlock), wordSize) >>
120 LogBytesPerWord;
121 }
122
123 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
124 return a->offset() - b->offset();
125 }
126
127 private:
128 int _offset;
129 uint _count;
130 };
131
132 struct JvmtiCachedClassFileData;
133
134 class InstanceKlass: public Klass {
135 friend class VMStructs;
136 friend class JVMCIVMStructs;
137 friend class ClassFileParser;
138 friend class CompileReplay;
139
140 public:
141 static const KlassKind Kind = InstanceKlassKind;
142
143 protected:
144 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE);
145
146 void* operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, bool use_class_space, TRAPS) throw();
147
148 public:
149 InstanceKlass();
150
151 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
152 // of the class loading & initialization procedure, and the use of the states.
153 enum ClassState : u1 {
154 allocated, // allocated (but not yet linked)
155 loaded, // loaded and inserted in class hierarchy (but not linked yet)
156 linked, // successfully linked/verified (but not initialized yet)
157 being_initialized, // currently running class initializer
158 fully_initialized, // initialized (successful final state)
159 initialization_error // error happened during initialization
160 };
161
162 private:
163 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
164
165 protected:
166 // If you add a new field that points to any metaspace object, you
167 // must add this field to InstanceKlass::metaspace_pointers_do().
168
169 // Annotations for this class
170 Annotations* _annotations;
171 // Package this class is defined in
172 PackageEntry* _package_entry;
173 // Array classes holding elements of this class.
174 ObjArrayKlass* volatile _array_klasses;
175 // Constant pool for this class.
176 ConstantPool* _constants;
177 // The InnerClasses attribute and EnclosingMethod attribute. The
178 // _inner_classes is an array of shorts. If the class has InnerClasses
179 // attribute, then the _inner_classes array begins with 4-tuples of shorts
180 // [inner_class_info_index, outer_class_info_index,
181 // inner_name_index, inner_class_access_flags] for the InnerClasses
182 // attribute. If the EnclosingMethod attribute exists, it occupies the
183 // last two shorts [class_index, method_index] of the array. If only
184 // the InnerClasses attribute exists, the _inner_classes array length is
185 // number_of_inner_classes * 4. If the class has both InnerClasses
186 // and EnclosingMethod attributes the _inner_classes array length is
187 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
188 Array<jushort>* _inner_classes;
189
190 // The NestMembers attribute. An array of shorts, where each is a
191 // class info index for the class that is a nest member. This data
192 // has not been validated.
193 Array<jushort>* _nest_members;
194
195 // Resolved nest-host klass: either true nest-host or self if we are not
196 // nested, or an error occurred resolving or validating the nominated
197 // nest-host. Can also be set directly by JDK API's that establish nest
198 // relationships.
199 // By always being set it makes nest-member access checks simpler.
200 InstanceKlass* _nest_host;
201
202 // The PermittedSubclasses attribute. An array of shorts, where each is a
203 // class info index for the class that is a permitted subclass.
204 Array<jushort>* _permitted_subclasses;
205
206 // The contents of the Record attribute.
207 Array<RecordComponent*>* _record_components;
208
209 // the source debug extension for this klass, null if not specified.
210 // Specified as UTF-8 string without terminating zero byte in the classfile,
211 // it is stored in the instanceklass as a null-terminated UTF-8 string
212 const char* _source_debug_extension;
213
214 // Number of heapOopSize words used by non-static fields in this klass
215 // (including inherited fields but after header_size()).
216 int _nonstatic_field_size;
217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
218 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks
219 int _itable_len; // length of Java itable (in words)
220
221 // The NestHost attribute. The class info index for the class
222 // that is the nest-host of this class. This data has not been validated.
223 u2 _nest_host_index;
224 u2 _this_class_index; // constant pool entry
225 u2 _static_oop_field_count; // number of static oop fields in this klass
226
227 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
228
229 // Class states are defined as ClassState (see above).
230 // Place the _init_state here to utilize the unused 2-byte after
231 // _idnum_allocated_count.
232 volatile ClassState _init_state; // state of class
233
234 u1 _reference_type; // reference type
235
236 // State is set either at parse time or while executing, atomically to not disturb other state
237 InstanceKlassFlags _misc_flags;
238
239 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
240
241 int _hash_offset; // Offset of hidden field for i-hash
242
243 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
244 JNIid* _jni_ids; // First JNI identifier for static fields in this class
245 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none
246 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
247 uint64_t volatile _dep_context_last_cleaned;
248 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
249 #if INCLUDE_JVMTI
250 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
251 // Linked instanceKlasses of previous versions
252 InstanceKlass* _previous_versions;
253 // JVMTI fields can be moved to their own structure - see 6315920
254 // JVMTI: cached class file, before retransformable agent modified it in CFLH
255 JvmtiCachedClassFileData* _cached_class_file;
256 #endif
257
258 #if INCLUDE_JVMTI
259 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
260 #endif
261
262 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
263 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once
264
265 // Method array.
266 Array<Method*>* _methods;
267 // Default Method Array, concrete methods inherited from interfaces
268 Array<Method*>* _default_methods;
269 // Interfaces (InstanceKlass*s) this class declares locally to implement.
270 Array<InstanceKlass*>* _local_interfaces;
271 // Interfaces (InstanceKlass*s) this class implements transitively.
272 Array<InstanceKlass*>* _transitive_interfaces;
273 // Int array containing the original order of method in the class file (for JVMTI).
274 Array<int>* _method_ordering;
275 // Int array containing the vtable_indices for default_methods
276 // offset matches _default_methods offset
277 Array<int>* _default_vtable_indices;
278
279 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp)
280 Array<u1>* _fieldinfo_stream;
281 Array<FieldStatus>* _fields_status;
282
283 // embedded Java vtable follows here
284 // embedded Java itables follows here
285 // embedded static fields follows here
286 // embedded nonstatic oop-map blocks follows here
287 // embedded implementor of this interface follows here
288 // The embedded implementor only exists if the current klass is an
289 // interface. The possible values of the implementor fall into following
290 // three cases:
291 // null: no implementor.
292 // A Klass* that's not itself: one implementor.
293 // Itself: more than one implementors.
294 //
295
296 friend class SystemDictionary;
297
298 static bool _disable_method_binary_search;
299
300 // Controls finalizer registration
301 static bool _finalization_enabled;
302
303 public:
304
305 // Queries finalization state
306 static bool is_finalization_enabled() { return _finalization_enabled; }
307
308 // Sets finalization state
309 static void set_finalization_enabled(bool val) { _finalization_enabled = val; }
310
311 // The three BUILTIN class loader types
312 bool is_shared_boot_class() const { return _misc_flags.is_shared_boot_class(); }
313 bool is_shared_platform_class() const { return _misc_flags.is_shared_platform_class(); }
314 bool is_shared_app_class() const { return _misc_flags.is_shared_app_class(); }
315 // The UNREGISTERED class loader type
316 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); }
317
318 // Check if the class can be shared in CDS
319 bool is_shareable() const;
320
321 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); }
322
323 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); }
324
325 #if INCLUDE_CDS
326 int shared_class_loader_type() const;
327 void set_shared_class_loader_type(s2 loader_type) { _misc_flags.set_shared_class_loader_type(loader_type); }
328 void assign_class_loader_type() { _misc_flags.assign_class_loader_type(_class_loader_data); }
329 #endif
330
331 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); }
332 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); }
333
334 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); }
335 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); }
336
337 // field sizes
338 int nonstatic_field_size() const { return _nonstatic_field_size; }
339 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
340
341 int static_field_size() const { return _static_field_size; }
342 void set_static_field_size(int size) { _static_field_size = size; }
343
344 int static_oop_field_count() const { return (int)_static_oop_field_count; }
345 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
346
347 // Java itable
348 int itable_length() const { return _itable_len; }
349 void set_itable_length(int len) { _itable_len = len; }
350
351 // array klasses
352 ObjArrayKlass* array_klasses() const { return _array_klasses; }
353 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics
354 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics
355 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; }
356
357 // methods
358 Array<Method*>* methods() const { return _methods; }
359 void set_methods(Array<Method*>* a) { _methods = a; }
360 Method* method_with_idnum(int idnum);
361 Method* method_with_orig_idnum(int idnum);
362 Method* method_with_orig_idnum(int idnum, int version);
363
364 // method ordering
365 Array<int>* method_ordering() const { return _method_ordering; }
366 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
367 void copy_method_ordering(const intArray* m, TRAPS);
368
369 // default_methods
370 Array<Method*>* default_methods() const { return _default_methods; }
371 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
372
373 // default method vtable_indices
374 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
375 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
376 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
377
378 // interfaces
379 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
380 void set_local_interfaces(Array<InstanceKlass*>* a) {
381 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking");
382 _local_interfaces = a; }
383
384 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
385 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
386 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking");
387 _transitive_interfaces = a;
388 }
389
390 private:
391 friend class fieldDescriptor;
392 FieldInfo field(int index) const;
393
394 public:
395 int field_offset (int index) const { return field(index).offset(); }
396 int field_access_flags(int index) const { return field(index).access_flags().as_field_flags(); }
397 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); }
398 FieldStatus field_status(int index) const { return fields_status()->at(index); }
399 inline Symbol* field_name (int index) const;
400 inline Symbol* field_signature (int index) const;
401
402 // Number of Java declared fields
403 int java_fields_count() const;
404 int total_fields_count() const;
405
406 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; }
407 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; }
408
409 Array<FieldStatus>* fields_status() const {return _fields_status; }
410 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; }
411
412 // inner classes
413 Array<u2>* inner_classes() const { return _inner_classes; }
414 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
415
416 // nest members
417 Array<u2>* nest_members() const { return _nest_members; }
418 void set_nest_members(Array<u2>* m) { _nest_members = m; }
419
420 // nest-host index
421 jushort nest_host_index() const { return _nest_host_index; }
422 void set_nest_host_index(u2 i) { _nest_host_index = i; }
423 // dynamic nest member support
424 void set_nest_host(InstanceKlass* host);
425
426 // record components
427 Array<RecordComponent*>* record_components() const { return _record_components; }
428 void set_record_components(Array<RecordComponent*>* record_components) {
429 _record_components = record_components;
430 }
431 bool is_record() const;
432
433 // test for enum class (or possibly an anonymous subclass within a sealed enum)
434 bool is_enum_subclass() const;
435
436 // permitted subclasses
437 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; }
438 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; }
439
440 private:
441 // Called to verify that k is a member of this nest - does not look at k's nest-host,
442 // nor does it resolve any CP entries or load any classes.
443 bool has_nest_member(JavaThread* current, InstanceKlass* k) const;
444
445 public:
446 // Call this only if you know that the nest host has been initialized.
447 InstanceKlass* nest_host_not_null() {
448 assert(_nest_host != nullptr, "must be");
449 return _nest_host;
450 }
451 // Used to construct informative IllegalAccessError messages at a higher level,
452 // if there was an issue resolving or validating the nest host.
453 // Returns null if there was no error.
454 const char* nest_host_error();
455 // Returns nest-host class, resolving and validating it if needed.
456 // Returns null if resolution is not possible from the calling context.
457 InstanceKlass* nest_host(TRAPS);
458 // Check if this klass is a nestmate of k - resolves this nest-host and k's
459 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
460
461 // Called to verify that k is a permitted subclass of this class.
462 // The incoming stringStream is used for logging, and for the caller to create
463 // a detailed exception message on failure.
464 bool has_as_permitted_subclass(const InstanceKlass* k, stringStream& ss) const;
465
466 enum InnerClassAttributeOffset {
467 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
468 inner_class_inner_class_info_offset = 0,
469 inner_class_outer_class_info_offset = 1,
470 inner_class_inner_name_offset = 2,
471 inner_class_access_flags_offset = 3,
472 inner_class_next_offset = 4
473 };
474
475 enum EnclosingMethodAttributeOffset {
476 enclosing_method_class_index_offset = 0,
477 enclosing_method_method_index_offset = 1,
478 enclosing_method_attribute_size = 2
479 };
480
481 // package
482 PackageEntry* package() const { return _package_entry; }
483 ModuleEntry* module() const;
484 bool in_javabase_module() const;
485 bool in_unnamed_package() const { return (_package_entry == nullptr); }
486 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS);
487 // If the package for the InstanceKlass is in the boot loader's package entry
488 // table then sets the classpath_index field so that
489 // get_system_package() will know to return a non-null value for the
490 // package's location. And, so that the package will be added to the list of
491 // packages returned by get_system_packages().
492 // For packages whose classes are loaded from the boot loader class path, the
493 // classpath_index indicates which entry on the boot loader class path.
494 void set_classpath_index(s2 path_index);
495 bool is_same_class_package(const Klass* class2) const;
496 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
497
498 // find an enclosing class
499 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
500
501 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
502 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
503
504 private:
505 // Check prohibited package ("java/" only loadable by boot or platform loaders)
506 static void check_prohibited_package(Symbol* class_name,
507 ClassLoaderData* loader_data,
508 TRAPS);
509
510 JavaThread* init_thread() { return Atomic::load(&_init_thread); }
511 const char* init_thread_name() {
512 return init_thread()->name_raw();
513 }
514
515 public:
516 // initialization state
517 bool is_loaded() const { return init_state() >= loaded; }
518 bool is_linked() const { return init_state() >= linked; }
519 bool is_initialized() const { return init_state() == fully_initialized; }
520 bool is_not_initialized() const { return init_state() < being_initialized; }
521 bool is_being_initialized() const { return init_state() == being_initialized; }
522 bool is_in_error_state() const { return init_state() == initialization_error; }
523 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
524 ClassState init_state() const { return Atomic::load_acquire(&_init_state); }
525 const char* init_state_name() const;
526 bool is_rewritten() const { return _misc_flags.rewritten(); }
527
528 // is this a sealed class
529 bool is_sealed() const;
530
531 // defineClass specified verification
532 bool should_verify_class() const { return _misc_flags.should_verify_class(); }
533 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); }
534
535 // marking
536 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); }
537 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); }
538
539 // initialization (virtuals from Klass)
540 bool should_be_initialized() const; // means that initialize should be called
541 void initialize_with_aot_initialized_mirror(TRAPS);
542 void assert_no_clinit_will_run_for_aot_initialized_class() const NOT_DEBUG_RETURN;
543 void initialize(TRAPS);
544 void link_class(TRAPS);
545 bool link_class_or_fail(TRAPS); // returns false on failure
546 void rewrite_class(TRAPS);
547 void link_methods(TRAPS);
548 Method* class_initializer() const;
549 bool interface_needs_clinit_execution_as_super(bool also_check_supers=true) const;
550
551 // reference type
552 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
553
554 // this class cp index
555 u2 this_class_index() const { return _this_class_index; }
556 void set_this_class_index(u2 index) { _this_class_index = index; }
557
558 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); }
559
560 // find local field, returns true if found
561 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
562 // find field in direct superinterfaces, returns the interface in which the field is defined
563 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
564 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
565 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
566 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
567 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
568
569 // find a non-static or static field given its offset within the class.
570 bool contains_field_offset(int offset);
571
572 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
573 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
574
575 private:
576 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
577
578 public:
579 static void disable_method_binary_search() {
580 _disable_method_binary_search = true;
581 }
582
583 // find a local method (returns null if not found)
584 Method* find_method(const Symbol* name, const Symbol* signature) const;
585 static Method* find_method(const Array<Method*>* methods,
586 const Symbol* name,
587 const Symbol* signature);
588
589 // find a local method, but skip static methods
590 Method* find_instance_method(const Symbol* name, const Symbol* signature,
591 PrivateLookupMode private_mode) const;
592 static Method* find_instance_method(const Array<Method*>* methods,
593 const Symbol* name,
594 const Symbol* signature,
595 PrivateLookupMode private_mode);
596
597 // find a local method (returns null if not found)
598 Method* find_local_method(const Symbol* name,
599 const Symbol* signature,
600 OverpassLookupMode overpass_mode,
601 StaticLookupMode static_mode,
602 PrivateLookupMode private_mode) const;
603
604 // find a local method from given methods array (returns null if not found)
605 static Method* find_local_method(const Array<Method*>* methods,
606 const Symbol* name,
607 const Symbol* signature,
608 OverpassLookupMode overpass_mode,
609 StaticLookupMode static_mode,
610 PrivateLookupMode private_mode);
611
612 // find a local method index in methods or default_methods (returns -1 if not found)
613 static int find_method_index(const Array<Method*>* methods,
614 const Symbol* name,
615 const Symbol* signature,
616 OverpassLookupMode overpass_mode,
617 StaticLookupMode static_mode,
618 PrivateLookupMode private_mode);
619
620 // lookup operation (returns null if not found)
621 Method* uncached_lookup_method(const Symbol* name,
622 const Symbol* signature,
623 OverpassLookupMode overpass_mode,
624 PrivateLookupMode private_mode = PrivateLookupMode::find) const;
625
626 // lookup a method in all the interfaces that this class implements
627 // (returns null if not found)
628 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
629
630 // lookup a method in local defaults then in all interfaces
631 // (returns null if not found)
632 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
633
634 // Find method indices by name. If a method with the specified name is
635 // found the index to the first method is returned, and 'end' is filled in
636 // with the index of first non-name-matching method. If no method is found
637 // -1 is returned.
638 int find_method_by_name(const Symbol* name, int* end) const;
639 static int find_method_by_name(const Array<Method*>* methods,
640 const Symbol* name, int* end);
641
642 // constant pool
643 ConstantPool* constants() const { return _constants; }
644 void set_constants(ConstantPool* c) { _constants = c; }
645
646 // protection domain
647 oop protection_domain() const;
648
649 // signers
650 objArrayOop signers() const;
651
652 bool is_contended() const { return _misc_flags.is_contended(); }
653 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); }
654
655 // source file name
656 Symbol* source_file_name() const;
657 u2 source_file_name_index() const;
658 void set_source_file_name_index(u2 sourcefile_index);
659
660 // minor and major version numbers of class file
661 u2 minor_version() const;
662 void set_minor_version(u2 minor_version);
663 u2 major_version() const;
664 void set_major_version(u2 major_version);
665
666 // source debug extension
667 const char* source_debug_extension() const { return _source_debug_extension; }
668 void set_source_debug_extension(const char* array, int length);
669
670 // nonstatic oop-map blocks
671 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
672 return oop_map_count * OopMapBlock::size_in_words();
673 }
674 unsigned int nonstatic_oop_map_count() const {
675 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
676 }
677 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
678 void set_nonstatic_oop_map_size(int words) {
679 _nonstatic_oop_map_size = words;
680 }
681
682 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); }
683 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); }
684
685 #if INCLUDE_JVMTI
686 // Redefinition locking. Class can only be redefined by one thread at a time.
687 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); }
688 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); }
689
690 // RedefineClasses() support for previous versions:
691 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
692 void purge_previous_version_list();
693
694 InstanceKlass* previous_versions() const { return _previous_versions; }
695 #else
696 InstanceKlass* previous_versions() const { return nullptr; }
697 #endif
698
699 InstanceKlass* get_klass_version(int version);
700
701 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); }
702 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); }
703
704 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); }
705 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); }
706
707 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); }
708 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); }
709 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); }
710
711 public:
712 #if INCLUDE_JVMTI
713
714 void init_previous_versions() {
715 _previous_versions = nullptr;
716 }
717
718 private:
719 static bool _should_clean_previous_versions;
720 public:
721 static void purge_previous_versions(InstanceKlass* ik) {
722 if (ik->has_been_redefined()) {
723 ik->purge_previous_version_list();
724 }
725 }
726
727 static bool should_clean_previous_versions_and_reset();
728 static bool should_clean_previous_versions() { return _should_clean_previous_versions; }
729
730 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
731 void set_cached_class_file(JvmtiCachedClassFileData *data) {
732 _cached_class_file = data;
733 }
734 JvmtiCachedClassFileData * get_cached_class_file();
735 jint get_cached_class_file_len();
736 unsigned char * get_cached_class_file_bytes();
737
738 // JVMTI: Support for caching of field indices, types, and offsets
739 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
740 _jvmti_cached_class_field_map = descriptor;
741 }
742 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
743 return _jvmti_cached_class_field_map;
744 }
745 #else // INCLUDE_JVMTI
746
747 static void purge_previous_versions(InstanceKlass* ik) { return; };
748 static bool should_clean_previous_versions_and_reset() { return false; }
749
750 void set_cached_class_file(JvmtiCachedClassFileData *data) {
751 assert(data == nullptr, "unexpected call with JVMTI disabled");
752 }
753 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; }
754
755 #endif // INCLUDE_JVMTI
756
757 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); }
758 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); }
759
760 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); }
761 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); }
762
763 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); }
764 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); }
765 bool has_final_method() const { return _misc_flags.has_final_method(); }
766 void set_has_final_method() { _misc_flags.set_has_final_method(true); }
767
768 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
769 inline u2 next_method_idnum();
770 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
771
772 // generics support
773 Symbol* generic_signature() const;
774 u2 generic_signature_index() const;
775 void set_generic_signature_index(u2 sig_index);
776
777 u2 enclosing_method_data(int offset) const;
778 u2 enclosing_method_class_index() const {
779 return enclosing_method_data(enclosing_method_class_index_offset);
780 }
781 u2 enclosing_method_method_index() {
782 return enclosing_method_data(enclosing_method_method_index_offset);
783 }
784 void set_enclosing_method_indices(u2 class_index,
785 u2 method_index);
786
787 // jmethodID support
788 jmethodID get_jmethod_id(const methodHandle& method_h);
789 void ensure_space_for_methodids(int start_offset = 0);
790 jmethodID jmethod_id_or_null(Method* method);
791 void update_methods_jmethod_cache();
792
793 // annotations support
794 Annotations* annotations() const { return _annotations; }
795 void set_annotations(Annotations* anno) { _annotations = anno; }
796
797 AnnotationArray* class_annotations() const {
798 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr;
799 }
800 Array<AnnotationArray*>* fields_annotations() const {
801 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr;
802 }
803 AnnotationArray* class_type_annotations() const {
804 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr;
805 }
806 Array<AnnotationArray*>* fields_type_annotations() const {
807 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr;
808 }
809 // allocation
810 instanceOop allocate_instance(TRAPS);
811 static instanceOop allocate_instance(oop cls, TRAPS);
812
813 // additional member function to return a handle
814 instanceHandle allocate_instance_handle(TRAPS);
815
816 objArrayOop allocate_objArray(int n, int length, TRAPS);
817 // Helper function
818 static instanceOop register_finalizer(instanceOop i, TRAPS);
819
820 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
821 // if not, throw either an Error or an Exception.
822 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
823
824 // initialization
825 void call_class_initializer(TRAPS);
826 void set_initialization_state_and_notify(ClassState state, TRAPS);
827
828 // OopMapCache support
829 OopMapCache* oop_map_cache() { return _oop_map_cache; }
830 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
831 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
832
833 // JNI identifier support (for static fields - for jni performance)
834 JNIid* jni_ids() { return _jni_ids; }
835 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
836 JNIid* jni_id_for(int offset);
837
838 public:
839 // maintenance of deoptimization dependencies
840 inline DependencyContext dependencies();
841 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes);
842 void add_dependent_nmethod(nmethod* nm);
843 void clean_dependency_context();
844 // Setup link to hierarchy and deoptimize
845 void add_to_hierarchy(JavaThread* current);
846
847 // On-stack replacement support
848 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
849 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
850 void add_osr_nmethod(nmethod* n);
851 bool remove_osr_nmethod(nmethod* n);
852 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m);
853 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
854
855 #if INCLUDE_JVMTI
856 // Breakpoint support (see methods on Method* for details)
857 BreakpointInfo* breakpoints() const { return _breakpoints; };
858 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
859 #endif
860
861 // support for stub routines
862 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); }
863 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
864 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); }
865
866 // subclass/subinterface checks
867 bool implements_interface(Klass* k) const;
868 bool is_same_or_direct_interface(Klass* k) const;
869
870 #ifdef ASSERT
871 // check whether this class or one of its superclasses was redefined
872 bool has_redefined_this_or_super() const;
873 #endif
874
875 // Access to the implementor of an interface.
876 InstanceKlass* implementor() const;
877 void set_implementor(InstanceKlass* ik);
878 int nof_implementors() const;
879 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
880 void init_implementor(); // initialize
881
882 private:
883 // link this class into the implementors list of every interface it implements
884 void process_interfaces();
885
886 public:
887 // virtual operations from Klass
888 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
889 Array<InstanceKlass*>* transitive_interfaces);
890 bool can_be_primary_super_slow() const;
891 size_t oop_size(oop obj, markWord mark) const { return size_helper(); }
892 // slow because it's a virtual call and used for verifying the layout_helper.
893 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
894 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
895
896 // Iterators
897 void do_local_static_fields(FieldClosure* cl);
898 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
899 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
900 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields
901
902 void methods_do(void f(Method* method));
903
904 static InstanceKlass* cast(Klass* k) {
905 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
906 }
907
908 static const InstanceKlass* cast(const Klass* k) {
909 assert(k != nullptr, "k should not be null");
910 assert(k->is_instance_klass(), "cast to InstanceKlass");
911 return static_cast<const InstanceKlass*>(k);
912 }
913
914 virtual InstanceKlass* java_super() const {
915 return (super() == nullptr) ? nullptr : cast(super());
916 }
917
918 // Sizing (in words)
919 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
920
921 static int size(int vtable_length, int itable_length,
922 int nonstatic_oop_map_size,
923 bool is_interface) {
924 return align_metadata_size(header_size() +
925 vtable_length +
926 itable_length +
927 nonstatic_oop_map_size +
928 (is_interface ? (int)sizeof(Klass*)/wordSize : 0));
929 }
930
931 int size() const { return size(vtable_length(),
932 itable_length(),
933 nonstatic_oop_map_size(),
934 is_interface());
935 }
936
937
938 inline intptr_t* start_of_itable() const;
939 inline intptr_t* end_of_itable() const;
940 inline oop static_field_base_raw();
941
942 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
943 inline Klass** end_of_nonstatic_oop_maps() const;
944
945 inline InstanceKlass* volatile* adr_implementor() const;
946
947 // Use this to return the size of an instance in heap words:
948 int size_helper() const {
949 return layout_helper_to_size_helper(layout_helper());
950 }
951
952 virtual int hash_offset_in_bytes(oop obj, markWord m) const {
953 assert(UseCompactObjectHeaders, "only with compact i-hash");
954 return _hash_offset;
955 }
956 static int hash_offset_offset_in_bytes() {
957 assert(UseCompactObjectHeaders, "only with compact i-hash");
958 return (int)offset_of(InstanceKlass, _hash_offset);
959 }
960
961 // This bit is initialized in classFileParser.cpp.
962 // It is false under any of the following conditions:
963 // - the class is abstract (including any interface)
964 // - the class size is larger than FastAllocateSizeLimit
965 // - the class is java/lang/Class, which cannot be allocated directly
966 bool can_be_fastpath_allocated() const {
967 return !layout_helper_needs_slow_path(layout_helper());
968 }
969
970 // Java itable
971 klassItable itable() const; // return klassItable wrapper
972 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
973 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
974 int vtable_index_of_interface_method(Method* method);
975
976 #if INCLUDE_JVMTI
977 void adjust_default_methods(bool* trace_name_printed);
978 #endif // INCLUDE_JVMTI
979
980 void clean_weak_instanceklass_links();
981 private:
982 void clean_implementors_list();
983 void clean_method_data();
984
985 public:
986 // Explicit metaspace deallocation of fields
987 // For RedefineClasses and class file parsing errors, we need to deallocate
988 // instanceKlasses and the metadata they point to.
989 void deallocate_contents(ClassLoaderData* loader_data);
990 static void deallocate_methods(ClassLoaderData* loader_data,
991 Array<Method*>* methods);
992 void static deallocate_interfaces(ClassLoaderData* loader_data,
993 const Klass* super_klass,
994 Array<InstanceKlass*>* local_interfaces,
995 Array<InstanceKlass*>* transitive_interfaces);
996 void static deallocate_record_components(ClassLoaderData* loader_data,
997 Array<RecordComponent*>* record_component);
998
999 virtual bool on_stack() const;
1000
1001 // callbacks for actions during class unloading
1002 static void unload_class(InstanceKlass* ik);
1003
1004 virtual void release_C_heap_structures(bool release_sub_metadata = true);
1005
1006 // Naming
1007 const char* signature_name() const;
1008
1009 // Oop fields (and metadata) iterators
1010 //
1011 // The InstanceKlass iterators also visits the Object's klass.
1012
1013 // Forward iteration
1014 public:
1015 // Iterate over all oop fields in the oop maps.
1016 template <typename T, class OopClosureType>
1017 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1018
1019 // Iterate over all oop fields and metadata.
1020 template <typename T, class OopClosureType>
1021 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1022
1023 // Iterate over all oop fields in one oop map.
1024 template <typename T, class OopClosureType>
1025 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1026
1027
1028 // Reverse iteration
1029 // Iterate over all oop fields and metadata.
1030 template <typename T, class OopClosureType>
1031 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1032
1033 private:
1034 // Iterate over all oop fields in the oop maps.
1035 template <typename T, class OopClosureType>
1036 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1037
1038 // Iterate over all oop fields in one oop map.
1039 template <typename T, class OopClosureType>
1040 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1041
1042
1043 // Bounded range iteration
1044 public:
1045 // Iterate over all oop fields in the oop maps.
1046 template <typename T, class OopClosureType>
1047 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1048
1049 // Iterate over all oop fields and metadata.
1050 template <typename T, class OopClosureType>
1051 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1052
1053 private:
1054 // Iterate over all oop fields in one oop map.
1055 template <typename T, class OopClosureType>
1056 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1057
1058
1059 public:
1060 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1061
1062 private:
1063 // initialization state
1064 void set_init_state(ClassState state);
1065 void set_rewritten() { _misc_flags.set_rewritten(true); }
1066 void set_init_thread(JavaThread *thread) {
1067 assert((thread == JavaThread::current() && _init_thread == nullptr) ||
1068 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization");
1069 Atomic::store(&_init_thread, thread);
1070 }
1071
1072 inline jmethodID* methods_jmethod_ids_acquire() const;
1073 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1074 // This nulls out jmethodIDs for all methods in 'klass'
1075 static void clear_jmethod_ids(InstanceKlass* klass);
1076 jmethodID update_jmethod_id(jmethodID* jmeths, Method* method, int idnum);
1077
1078 public:
1079 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1080 // Must be one per class and it has to be a VM internal object so java code
1081 // cannot lock it (like the mirror).
1082 // It has to be an object not a Mutex because it's held through java calls.
1083 oop init_lock() const;
1084
1085 // Returns the array class for the n'th dimension
1086 virtual ArrayKlass* array_klass(int n, TRAPS);
1087 virtual ArrayKlass* array_klass_or_null(int n);
1088
1089 // Returns the array class with this class as element type
1090 virtual ArrayKlass* array_klass(TRAPS);
1091 virtual ArrayKlass* array_klass_or_null();
1092
1093 static void clean_initialization_error_table();
1094 private:
1095 void fence_and_clear_init_lock();
1096
1097 bool link_class_impl (TRAPS);
1098 bool verify_code (TRAPS);
1099 void initialize_impl (TRAPS);
1100 void initialize_super_interfaces (TRAPS);
1101
1102 void add_initialization_error(JavaThread* current, Handle exception);
1103 oop get_initialization_error(JavaThread* current);
1104
1105 // find a local method (returns null if not found)
1106 Method* find_method_impl(const Symbol* name,
1107 const Symbol* signature,
1108 OverpassLookupMode overpass_mode,
1109 StaticLookupMode static_mode,
1110 PrivateLookupMode private_mode) const;
1111
1112 static Method* find_method_impl(const Array<Method*>* methods,
1113 const Symbol* name,
1114 const Symbol* signature,
1115 OverpassLookupMode overpass_mode,
1116 StaticLookupMode static_mode,
1117 PrivateLookupMode private_mode);
1118
1119 #if INCLUDE_JVMTI
1120 // RedefineClasses support
1121 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1122 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1123 #endif
1124 // log class name to classlist
1125 void log_to_classlist() const;
1126 public:
1127
1128 #if INCLUDE_CDS
1129 // CDS support - remove and restore oops from metadata. Oops are not shared.
1130 virtual void remove_unshareable_info();
1131 void remove_unshareable_flags();
1132 virtual void remove_java_mirror();
1133 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS);
1134 void init_shared_package_entry();
1135 bool can_be_verified_at_dumptime() const;
1136 void compute_has_loops_flag_for_methods();
1137 #endif
1138
1139 u2 compute_modifier_flags() const;
1140
1141 public:
1142 // JVMTI support
1143 jint jvmti_class_status() const;
1144
1145 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1146
1147 public:
1148 // Printing
1149 void print_on(outputStream* st) const;
1150 void print_value_on(outputStream* st) const;
1151
1152 void oop_print_value_on(oop obj, outputStream* st);
1153
1154 void oop_print_on (oop obj, outputStream* st);
1155
1156 #ifndef PRODUCT
1157 void print_dependent_nmethods(bool verbose = false);
1158 bool is_dependent_nmethod(nmethod* nm);
1159 bool verify_itable_index(int index);
1160 #endif
1161
1162 const char* internal_name() const;
1163
1164 // Verification
1165 void verify_on(outputStream* st);
1166
1167 void oop_verify_on(oop obj, outputStream* st);
1168
1169 // Logging
1170 void print_class_load_logging(ClassLoaderData* loader_data,
1171 const ModuleEntry* module_entry,
1172 const ClassFileStream* cfs) const;
1173 private:
1174 void print_class_load_cause_logging() const;
1175 void print_class_load_helper(ClassLoaderData* loader_data,
1176 const ModuleEntry* module_entry,
1177 const ClassFileStream* cfs) const;
1178 };
1179
1180 // for adding methods
1181 // UNSET_IDNUM return means no more ids available
1182 inline u2 InstanceKlass::next_method_idnum() {
1183 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1184 return ConstMethod::UNSET_IDNUM; // no more ids available
1185 } else {
1186 return _idnum_allocated_count++;
1187 }
1188 }
1189
1190 class PrintClassClosure : public KlassClosure {
1191 private:
1192 outputStream* _st;
1193 bool _verbose;
1194 public:
1195 PrintClassClosure(outputStream* st, bool verbose);
1196
1197 void do_klass(Klass* k);
1198 };
1199
1200 /* JNIid class for jfieldIDs only */
1201 class JNIid: public CHeapObj<mtClass> {
1202 friend class VMStructs;
1203 private:
1204 Klass* _holder;
1205 JNIid* _next;
1206 int _offset;
1207 #ifdef ASSERT
1208 bool _is_static_field_id;
1209 #endif
1210
1211 public:
1212 // Accessors
1213 Klass* holder() const { return _holder; }
1214 int offset() const { return _offset; }
1215 JNIid* next() { return _next; }
1216 // Constructor
1217 JNIid(Klass* holder, int offset, JNIid* next);
1218 // Identifier lookup
1219 JNIid* find(int offset);
1220
1221 bool find_local_field(fieldDescriptor* fd) {
1222 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1223 }
1224
1225 static void deallocate(JNIid* id);
1226 // Debugging
1227 #ifdef ASSERT
1228 bool is_static_field_id() const { return _is_static_field_id; }
1229 void set_is_static_field_id() { _is_static_field_id = true; }
1230 #endif
1231 void verify(Klass* holder);
1232 };
1233
1234 // An iterator that's used to access the inner classes indices in the
1235 // InstanceKlass::_inner_classes array.
1236 class InnerClassesIterator : public StackObj {
1237 private:
1238 Array<jushort>* _inner_classes;
1239 int _length;
1240 int _idx;
1241 public:
1242
1243 InnerClassesIterator(const InstanceKlass* k) {
1244 _inner_classes = k->inner_classes();
1245 if (k->inner_classes() != nullptr) {
1246 _length = _inner_classes->length();
1247 // The inner class array's length should be the multiple of
1248 // inner_class_next_offset if it only contains the InnerClasses
1249 // attribute data, or it should be
1250 // n*inner_class_next_offset+enclosing_method_attribute_size
1251 // if it also contains the EnclosingMethod data.
1252 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1253 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1254 "just checking");
1255 // Remove the enclosing_method portion if exists.
1256 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1257 _length -= InstanceKlass::enclosing_method_attribute_size;
1258 }
1259 } else {
1260 _length = 0;
1261 }
1262 _idx = 0;
1263 }
1264
1265 int length() const {
1266 return _length;
1267 }
1268
1269 void next() {
1270 _idx += InstanceKlass::inner_class_next_offset;
1271 }
1272
1273 bool done() const {
1274 return (_idx >= _length);
1275 }
1276
1277 u2 inner_class_info_index() const {
1278 return _inner_classes->at(
1279 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1280 }
1281
1282 void set_inner_class_info_index(u2 index) {
1283 _inner_classes->at_put(
1284 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1285 }
1286
1287 u2 outer_class_info_index() const {
1288 return _inner_classes->at(
1289 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1290 }
1291
1292 void set_outer_class_info_index(u2 index) {
1293 _inner_classes->at_put(
1294 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1295 }
1296
1297 u2 inner_name_index() const {
1298 return _inner_classes->at(
1299 _idx + InstanceKlass::inner_class_inner_name_offset);
1300 }
1301
1302 void set_inner_name_index(u2 index) {
1303 _inner_classes->at_put(
1304 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1305 }
1306
1307 u2 inner_access_flags() const {
1308 return _inner_classes->at(
1309 _idx + InstanceKlass::inner_class_access_flags_offset);
1310 }
1311 };
1312
1313 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal.
1314 // Usage:
1315 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) {
1316 // Klass* k = iter.klass();
1317 // ...
1318 // }
1319 class ClassHierarchyIterator : public StackObj {
1320 private:
1321 InstanceKlass* _root;
1322 Klass* _current;
1323 bool _visit_subclasses;
1324
1325 public:
1326 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) {
1327 assert(_root == _current, "required"); // initial state
1328 }
1329
1330 bool done() {
1331 return (_current == nullptr);
1332 }
1333
1334 // Make a step iterating over the class hierarchy under the root class.
1335 // Skips subclasses if requested.
1336 void next();
1337
1338 Klass* klass() {
1339 assert(!done(), "sanity");
1340 return _current;
1341 }
1342
1343 // Skip subclasses of the current class.
1344 void skip_subclasses() {
1345 _visit_subclasses = false;
1346 }
1347 };
1348
1349 #endif // SHARE_OOPS_INSTANCEKLASS_HPP