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.
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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 public:
147 InstanceKlass();
148
149 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
150 // of the class loading & initialization procedure, and the use of the states.
151 enum ClassState : u1 {
152 allocated, // allocated (but not yet linked)
153 loaded, // loaded and inserted in class hierarchy (but not linked yet)
154 linked, // successfully linked/verified (but not initialized yet)
155 being_initialized, // currently running class initializer
156 fully_initialized, // initialized (successful final state)
157 initialization_error // error happened during initialization
158 };
159
160 private:
161 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
162
163 protected:
164 // If you add a new field that points to any metaspace object, you
165 // must add this field to InstanceKlass::metaspace_pointers_do().
166
167 // Annotations for this class
168 Annotations* _annotations;
169 // Package this class is defined in
170 PackageEntry* _package_entry;
171 // Array classes holding elements of this class.
172 ObjArrayKlass* volatile _array_klasses;
173 // Constant pool for this class.
174 ConstantPool* _constants;
175 // The InnerClasses attribute and EnclosingMethod attribute. The
176 // _inner_classes is an array of shorts. If the class has InnerClasses
177 // attribute, then the _inner_classes array begins with 4-tuples of shorts
178 // [inner_class_info_index, outer_class_info_index,
179 // inner_name_index, inner_class_access_flags] for the InnerClasses
180 // attribute. If the EnclosingMethod attribute exists, it occupies the
181 // last two shorts [class_index, method_index] of the array. If only
182 // the InnerClasses attribute exists, the _inner_classes array length is
183 // number_of_inner_classes * 4. If the class has both InnerClasses
184 // and EnclosingMethod attributes the _inner_classes array length is
185 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
186 Array<jushort>* _inner_classes;
187
188 // The NestMembers attribute. An array of shorts, where each is a
189 // class info index for the class that is a nest member. This data
190 // has not been validated.
191 Array<jushort>* _nest_members;
192
193 // Resolved nest-host klass: either true nest-host or self if we are not
194 // nested, or an error occurred resolving or validating the nominated
195 // nest-host. Can also be set directly by JDK API's that establish nest
196 // relationships.
197 // By always being set it makes nest-member access checks simpler.
198 InstanceKlass* _nest_host;
199
200 // The PermittedSubclasses attribute. An array of shorts, where each is a
201 // class info index for the class that is a permitted subclass.
202 Array<jushort>* _permitted_subclasses;
203
204 // The contents of the Record attribute.
205 Array<RecordComponent*>* _record_components;
206
207 // the source debug extension for this klass, null if not specified.
208 // Specified as UTF-8 string without terminating zero byte in the classfile,
209 // it is stored in the instanceklass as a null-terminated UTF-8 string
210 const char* _source_debug_extension;
211
212 // Number of heapOopSize words used by non-static fields in this klass
213 // (including inherited fields but after header_size()).
214 int _nonstatic_field_size;
215 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
216 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks
217 int _itable_len; // length of Java itable (in words)
218
219 // The NestHost attribute. The class info index for the class
220 // that is the nest-host of this class. This data has not been validated.
221 u2 _nest_host_index;
222 u2 _this_class_index; // constant pool entry
223 u2 _static_oop_field_count; // number of static oop fields in this klass
224
225 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
226
227 // Class states are defined as ClassState (see above).
228 // Place the _init_state here to utilize the unused 2-byte after
229 // _idnum_allocated_count.
230 volatile ClassState _init_state; // state of class
231
232 u1 _reference_type; // reference type
233
234 // State is set either at parse time or while executing, atomically to not disturb other state
235 InstanceKlassFlags _misc_flags;
236
237 JavaThread* volatile _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
238
239 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
240 JNIid* _jni_ids; // First JNI identifier for static fields in this class
241 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or null if none
242 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
243 uint64_t volatile _dep_context_last_cleaned;
244 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
245 #if INCLUDE_JVMTI
246 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
247 // Linked instanceKlasses of previous versions
248 InstanceKlass* _previous_versions;
249 // JVMTI fields can be moved to their own structure - see 6315920
250 // JVMTI: cached class file, before retransformable agent modified it in CFLH
251 JvmtiCachedClassFileData* _cached_class_file;
252 #endif
253
254 #if INCLUDE_JVMTI
255 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
256 #endif
257
258 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
259 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once
260
261 // Method array.
262 Array<Method*>* _methods;
263 // Default Method Array, concrete methods inherited from interfaces
264 Array<Method*>* _default_methods;
265 // Interfaces (InstanceKlass*s) this class declares locally to implement.
266 Array<InstanceKlass*>* _local_interfaces;
267 // Interfaces (InstanceKlass*s) this class implements transitively.
268 Array<InstanceKlass*>* _transitive_interfaces;
269 // Int array containing the original order of method in the class file (for JVMTI).
270 Array<int>* _method_ordering;
271 // Int array containing the vtable_indices for default_methods
272 // offset matches _default_methods offset
273 Array<int>* _default_vtable_indices;
274
275 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp)
276 Array<u1>* _fieldinfo_stream;
277 Array<u1>* _fieldinfo_search_table;
278 Array<FieldStatus>* _fields_status;
279
280 // embedded Java vtable follows here
281 // embedded Java itables follows here
282 // embedded static fields follows here
283 // embedded nonstatic oop-map blocks follows here
284 // embedded implementor of this interface follows here
285 // The embedded implementor only exists if the current klass is an
286 // interface. The possible values of the implementor fall into following
287 // three cases:
288 // null: no implementor.
289 // A Klass* that's not itself: one implementor.
290 // Itself: more than one implementors.
291 //
292
293 friend class SystemDictionary;
294
295 static bool _disable_method_binary_search;
296
297 // Controls finalizer registration
298 static bool _finalization_enabled;
299
300 public:
301
302 // Queries finalization state
303 static bool is_finalization_enabled() { return _finalization_enabled; }
304
305 // Sets finalization state
306 static void set_finalization_enabled(bool val) { _finalization_enabled = val; }
307
308 // Quick checks for the loader that defined this class (without switching on this->class_loader())
309 bool defined_by_boot_loader() const { return _misc_flags.defined_by_boot_loader(); }
310 bool defined_by_platform_loader() const { return _misc_flags.defined_by_platform_loader(); }
311 bool defined_by_app_loader() const { return _misc_flags.defined_by_app_loader(); }
312 bool defined_by_other_loaders() const { return _misc_flags.defined_by_other_loaders(); }
313 void set_class_loader_type() { _misc_flags.set_class_loader_type(_class_loader_data); }
314
315 // Check if the class can be shared in CDS
316 bool is_shareable() const;
317
318 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); }
319
320 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); }
321
322 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); }
323 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); }
324
325 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); }
326 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); }
327
328 // field sizes
329 int nonstatic_field_size() const { return _nonstatic_field_size; }
330 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
331
332 int static_field_size() const { return _static_field_size; }
333 void set_static_field_size(int size) { _static_field_size = size; }
334
335 int static_oop_field_count() const { return (int)_static_oop_field_count; }
336 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
337
338 // Java itable
339 int itable_length() const { return _itable_len; }
340 void set_itable_length(int len) { _itable_len = len; }
341
342 // array klasses
343 ObjArrayKlass* array_klasses() const { return _array_klasses; }
344 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics
345 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics
346 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; }
347
348 // methods
349 Array<Method*>* methods() const { return _methods; }
350 void set_methods(Array<Method*>* a) { _methods = a; }
351 Method* method_with_idnum(int idnum) const;
352 Method* method_with_orig_idnum(int idnum) const;
353 Method* method_with_orig_idnum(int idnum, int version) const;
354
355 // method ordering
356 Array<int>* method_ordering() const { return _method_ordering; }
357 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
358 void copy_method_ordering(const intArray* m, TRAPS);
359
360 // default_methods
361 Array<Method*>* default_methods() const { return _default_methods; }
362 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
363
364 // default method vtable_indices
365 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
366 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
367 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
368
369 // interfaces
370 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
371 void set_local_interfaces(Array<InstanceKlass*>* a) {
372 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking");
373 _local_interfaces = a; }
374
375 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
376 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
377 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking");
378 _transitive_interfaces = a;
379 }
380
381 private:
382 friend class fieldDescriptor;
383 FieldInfo field(int index) const;
384
385 public:
386 int field_offset (int index) const { return field(index).offset(); }
387 int field_access_flags(int index) const { return field(index).access_flags().as_field_flags(); }
388 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); }
389 FieldStatus field_status(int index) const { return fields_status()->at(index); }
390 inline Symbol* field_name (int index) const;
391 inline Symbol* field_signature (int index) const;
392
393 // Number of Java declared fields
394 int java_fields_count() const;
395 int total_fields_count() const;
396
397 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; }
398 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; }
399
400 Array<u1>* fieldinfo_search_table() const { return _fieldinfo_search_table; }
401 void set_fieldinfo_search_table(Array<u1>* table) { _fieldinfo_search_table = table; }
402
403 Array<FieldStatus>* fields_status() const {return _fields_status; }
404 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; }
405
406 // inner classes
407 Array<u2>* inner_classes() const { return _inner_classes; }
408 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
409
410 // nest members
411 Array<u2>* nest_members() const { return _nest_members; }
412 void set_nest_members(Array<u2>* m) { _nest_members = m; }
413
414 // nest-host index
415 jushort nest_host_index() const { return _nest_host_index; }
416 void set_nest_host_index(u2 i) { _nest_host_index = i; }
417 // dynamic nest member support
418 void set_nest_host(InstanceKlass* host);
419
420 // record components
421 Array<RecordComponent*>* record_components() const { return _record_components; }
422 void set_record_components(Array<RecordComponent*>* record_components) {
423 _record_components = record_components;
424 }
425 bool is_record() const;
426
427 // test for enum class (or possibly an anonymous subclass within a sealed enum)
428 bool is_enum_subclass() const;
429
430 // permitted subclasses
431 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; }
432 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; }
433
434 private:
435 // Called to verify that k is a member of this nest - does not look at k's nest-host,
436 // nor does it resolve any CP entries or load any classes.
437 bool has_nest_member(JavaThread* current, InstanceKlass* k) const;
438
439 public:
440 // Call this only if you know that the nest host has been initialized.
441 InstanceKlass* nest_host_not_null() {
442 assert(_nest_host != nullptr, "must be");
443 return _nest_host;
444 }
445 InstanceKlass* nest_host_or_null() {
446 return _nest_host;
447 }
448 // Used to construct informative IllegalAccessError messages at a higher level,
449 // if there was an issue resolving or validating the nest host.
450 // Returns null if there was no error.
451 const char* nest_host_error();
452 // Returns nest-host class, resolving and validating it if needed.
453 // Returns null if resolution is not possible from the calling context.
454 InstanceKlass* nest_host(TRAPS);
455 // Check if this klass is a nestmate of k - resolves this nest-host and k's
456 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
457
458 // Called to verify that k is a permitted subclass of this class.
459 // The incoming stringStream is used for logging, and for the caller to create
460 // a detailed exception message on failure.
461 bool has_as_permitted_subclass(const InstanceKlass* k, stringStream& ss) const;
462
463 enum InnerClassAttributeOffset {
464 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
465 inner_class_inner_class_info_offset = 0,
466 inner_class_outer_class_info_offset = 1,
467 inner_class_inner_name_offset = 2,
468 inner_class_access_flags_offset = 3,
469 inner_class_next_offset = 4
470 };
471
472 enum EnclosingMethodAttributeOffset {
473 enclosing_method_class_index_offset = 0,
474 enclosing_method_method_index_offset = 1,
475 enclosing_method_attribute_size = 2
476 };
477
478 // package
479 PackageEntry* package() const { return _package_entry; }
480 ModuleEntry* module() const;
481 bool in_javabase_module() const;
482 bool in_unnamed_package() const { return (_package_entry == nullptr); }
483 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS);
484 // If the package for the InstanceKlass is in the boot loader's package entry
485 // table then sets the classpath_index field so that
486 // get_system_package() will know to return a non-null value for the
487 // package's location. And, so that the package will be added to the list of
488 // packages returned by get_system_packages().
489 // For packages whose classes are loaded from the boot loader class path, the
490 // classpath_index indicates which entry on the boot loader class path.
491 void set_classpath_index(s2 path_index);
492 bool is_same_class_package(const Klass* class2) const;
493 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
494
495 // find an enclosing class
496 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
497
498 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
499 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
500
501 private:
502 // Check prohibited package ("java/" only loadable by boot or platform loaders)
503 static void check_prohibited_package(Symbol* class_name,
504 ClassLoaderData* loader_data,
505 TRAPS);
506
507 JavaThread* init_thread() { return AtomicAccess::load(&_init_thread); }
508 const char* init_thread_name() {
509 return init_thread()->name_raw();
510 }
511
512 public:
513 // initialization state
514 bool is_loaded() const { return init_state() >= loaded; }
515 bool is_linked() const { return init_state() >= linked; }
516 bool is_initialized() const { return init_state() == fully_initialized; }
517 bool is_not_initialized() const { return init_state() < being_initialized; }
518 bool is_being_initialized() const { return init_state() == being_initialized; }
519 bool is_in_error_state() const { return init_state() == initialization_error; }
520 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
521 ClassState init_state() const { return AtomicAccess::load_acquire(&_init_state); }
522 const char* init_state_name() const;
523 bool is_rewritten() const { return _misc_flags.rewritten(); }
524
525 static const char* state2name(ClassState state);
526
527 // is this a sealed class
528 bool is_sealed() const;
529
530 // defineClass specified verification
531 bool should_verify_class() const { return _misc_flags.should_verify_class(); }
532 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); }
533
534 // marking
535 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); }
536 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); }
537
538 // initialization (virtuals from Klass)
539 bool should_be_initialized() const; // means that initialize should be called
540 void initialize_with_aot_initialized_mirror(TRAPS);
541 void assert_no_clinit_will_run_for_aot_initialized_class() const NOT_DEBUG_RETURN;
542 void initialize(TRAPS);
543 void link_class(TRAPS);
544 bool link_class_or_fail(TRAPS); // returns false on failure
545 void rewrite_class(TRAPS);
546 void link_methods(TRAPS);
547 Method* class_initializer() const;
548 bool interface_needs_clinit_execution_as_super(bool also_check_supers=true) const;
549
550 // reference type
551 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
552
553 // this class cp index
554 u2 this_class_index() const { return _this_class_index; }
555 void set_this_class_index(u2 index) { _this_class_index = index; }
556
557 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); }
558
559 // find local field, returns true if found
560 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
561 // find field in direct superinterfaces, returns the interface in which the field is defined
562 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
563 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
564 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
565 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
566 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
567
568 // find a non-static or static field given its offset within the class.
569 bool contains_field_offset(int offset);
570
571 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
572 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
573
574 private:
575 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
576
577 public:
578 static void disable_method_binary_search() {
579 _disable_method_binary_search = true;
580 }
581
582 // find a local method (returns null if not found)
583 Method* find_method(const Symbol* name, const Symbol* signature) const;
584 static Method* find_method(const Array<Method*>* methods,
585 const Symbol* name,
586 const Symbol* signature);
587
588 // find a local method, but skip static methods
589 Method* find_instance_method(const Symbol* name, const Symbol* signature,
590 PrivateLookupMode private_mode) const;
591 static Method* find_instance_method(const Array<Method*>* methods,
592 const Symbol* name,
593 const Symbol* signature,
594 PrivateLookupMode private_mode);
595
596 // find a local method (returns null if not found)
597 Method* find_local_method(const Symbol* name,
598 const Symbol* signature,
599 OverpassLookupMode overpass_mode,
600 StaticLookupMode static_mode,
601 PrivateLookupMode private_mode) const;
602
603 // find a local method from given methods array (returns null if not found)
604 static Method* find_local_method(const Array<Method*>* methods,
605 const Symbol* name,
606 const Symbol* signature,
607 OverpassLookupMode overpass_mode,
608 StaticLookupMode static_mode,
609 PrivateLookupMode private_mode);
610
611 // find a local method index in methods or default_methods (returns -1 if not found)
612 static int find_method_index(const Array<Method*>* methods,
613 const Symbol* name,
614 const Symbol* signature,
615 OverpassLookupMode overpass_mode,
616 StaticLookupMode static_mode,
617 PrivateLookupMode private_mode);
618
619 // lookup operation (returns null if not found)
620 Method* uncached_lookup_method(const Symbol* name,
621 const Symbol* signature,
622 OverpassLookupMode overpass_mode,
623 PrivateLookupMode private_mode = PrivateLookupMode::find) const;
624
625 // lookup a method in all the interfaces that this class implements
626 // (returns null if not found)
627 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
628
629 // lookup a method in local defaults then in all interfaces
630 // (returns null if not found)
631 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
632
633 // Find method indices by name. If a method with the specified name is
634 // found the index to the first method is returned, and 'end' is filled in
635 // with the index of first non-name-matching method. If no method is found
636 // -1 is returned.
637 int find_method_by_name(const Symbol* name, int* end) const;
638 static int find_method_by_name(const Array<Method*>* methods,
639 const Symbol* name, int* end);
640
641 // constant pool
642 ConstantPool* constants() const { return _constants; }
643 void set_constants(ConstantPool* c) { _constants = c; }
644
645 // protection domain
646 oop protection_domain() const;
647
648 // signers
649 objArrayOop signers() const;
650
651 bool is_contended() const { return _misc_flags.is_contended(); }
652 void set_is_contended(bool value) { _misc_flags.set_is_contended(value); }
653
654 // source file name
655 Symbol* source_file_name() const;
656 u2 source_file_name_index() const;
657 void set_source_file_name_index(u2 sourcefile_index);
658
659 // minor and major version numbers of class file
660 u2 minor_version() const;
661 void set_minor_version(u2 minor_version);
662 u2 major_version() const;
663 void set_major_version(u2 major_version);
664
665 // source debug extension
666 const char* source_debug_extension() const { return _source_debug_extension; }
667 void set_source_debug_extension(const char* array, int length);
668
669 // nonstatic oop-map blocks
670 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
671 return oop_map_count * OopMapBlock::size_in_words();
672 }
673 unsigned int nonstatic_oop_map_count() const {
674 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
675 }
676 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
677 void set_nonstatic_oop_map_size(int words) {
678 _nonstatic_oop_map_size = words;
679 }
680
681 bool has_contended_annotations() const { return _misc_flags.has_contended_annotations(); }
682 void set_has_contended_annotations(bool value) { _misc_flags.set_has_contended_annotations(value); }
683
684 #if INCLUDE_JVMTI
685 // Redefinition locking. Class can only be redefined by one thread at a time.
686 bool is_being_redefined() const { return _misc_flags.is_being_redefined(); }
687 void set_is_being_redefined(bool value) { _misc_flags.set_is_being_redefined(value); }
688
689 // RedefineClasses() support for previous versions:
690 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
691 void purge_previous_version_list();
692
693 InstanceKlass* previous_versions() const { return _previous_versions; }
694 #else
695 InstanceKlass* previous_versions() const { return nullptr; }
696 #endif
697
698 const InstanceKlass* get_klass_version(int version) const;
699
700 bool has_been_redefined() const { return _misc_flags.has_been_redefined(); }
701 void set_has_been_redefined() { _misc_flags.set_has_been_redefined(true); }
702
703 bool is_scratch_class() const { return _misc_flags.is_scratch_class(); }
704 void set_is_scratch_class() { _misc_flags.set_is_scratch_class(true); }
705
706 bool has_resolved_methods() const { return _misc_flags.has_resolved_methods(); }
707 void set_has_resolved_methods() { _misc_flags.set_has_resolved_methods(true); }
708 void set_has_resolved_methods(bool value) { _misc_flags.set_has_resolved_methods(value); }
709
710 public:
711 #if INCLUDE_JVMTI
712
713 void init_previous_versions() {
714 _previous_versions = nullptr;
715 }
716
717 private:
718 static bool _should_clean_previous_versions;
719 public:
720 static void purge_previous_versions(InstanceKlass* ik) {
721 if (ik->has_been_redefined()) {
722 ik->purge_previous_version_list();
723 }
724 }
725
726 static bool should_clean_previous_versions_and_reset();
727 static bool should_clean_previous_versions() { return _should_clean_previous_versions; }
728
729 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
730 void set_cached_class_file(JvmtiCachedClassFileData *data) {
731 _cached_class_file = data;
732 }
733 JvmtiCachedClassFileData * get_cached_class_file();
734 jint get_cached_class_file_len();
735 unsigned char * get_cached_class_file_bytes();
736
737 // JVMTI: Support for caching of field indices, types, and offsets
738 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
739 _jvmti_cached_class_field_map = descriptor;
740 }
741 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
742 return _jvmti_cached_class_field_map;
743 }
744 #else // INCLUDE_JVMTI
745
746 static void purge_previous_versions(InstanceKlass* ik) { return; };
747 static bool should_clean_previous_versions_and_reset() { return false; }
748
749 void set_cached_class_file(JvmtiCachedClassFileData *data) {
750 assert(data == nullptr, "unexpected call with JVMTI disabled");
751 }
752 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)nullptr; }
753
754 #endif // INCLUDE_JVMTI
755
756 bool has_nonstatic_concrete_methods() const { return _misc_flags.has_nonstatic_concrete_methods(); }
757 void set_has_nonstatic_concrete_methods(bool b) { _misc_flags.set_has_nonstatic_concrete_methods(b); }
758
759 bool declares_nonstatic_concrete_methods() const { return _misc_flags.declares_nonstatic_concrete_methods(); }
760 void set_declares_nonstatic_concrete_methods(bool b) { _misc_flags.set_declares_nonstatic_concrete_methods(b); }
761
762 bool has_miranda_methods () const { return _misc_flags.has_miranda_methods(); }
763 void set_has_miranda_methods() { _misc_flags.set_has_miranda_methods(true); }
764 bool has_final_method() const { return _misc_flags.has_final_method(); }
765 void set_has_final_method() { _misc_flags.set_has_final_method(true); }
766
767 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
768 inline u2 next_method_idnum();
769 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
770
771 // generics support
772 Symbol* generic_signature() const;
773 u2 generic_signature_index() const;
774 void set_generic_signature_index(u2 sig_index);
775
776 u2 enclosing_method_data(int offset) const;
777 u2 enclosing_method_class_index() const {
778 return enclosing_method_data(enclosing_method_class_index_offset);
779 }
780 u2 enclosing_method_method_index() {
781 return enclosing_method_data(enclosing_method_method_index_offset);
782 }
783 void set_enclosing_method_indices(u2 class_index,
784 u2 method_index);
785
786 // jmethodID support
787 jmethodID get_jmethod_id(Method* method);
788 void make_methods_jmethod_ids();
789 jmethodID jmethod_id_or_null(Method* method);
790 void update_methods_jmethod_cache();
791
792 // annotations support
793 Annotations* annotations() const { return _annotations; }
794 void set_annotations(Annotations* anno) { _annotations = anno; }
795
796 AnnotationArray* class_annotations() const {
797 return (_annotations != nullptr) ? _annotations->class_annotations() : nullptr;
798 }
799 Array<AnnotationArray*>* fields_annotations() const {
800 return (_annotations != nullptr) ? _annotations->fields_annotations() : nullptr;
801 }
802 AnnotationArray* class_type_annotations() const {
803 return (_annotations != nullptr) ? _annotations->class_type_annotations() : nullptr;
804 }
805 Array<AnnotationArray*>* fields_type_annotations() const {
806 return (_annotations != nullptr) ? _annotations->fields_type_annotations() : nullptr;
807 }
808 // allocation
809 instanceOop allocate_instance(TRAPS);
810 static instanceOop allocate_instance(oop cls, const char* who, TRAPS);
811
812 // additional member function to return a handle
813 instanceHandle allocate_instance_handle(TRAPS);
814
815 // Helper function
816 static instanceOop register_finalizer(instanceOop i, TRAPS);
817
818 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
819 // if not, throw either an Error or an Exception.
820 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
821
822 // initialization
823 void call_class_initializer(TRAPS);
824 void set_initialization_state_and_notify(ClassState state, TRAPS);
825
826 // OopMapCache support
827 OopMapCache* oop_map_cache() { return _oop_map_cache; }
828 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
829 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
830
831 // JNI identifier support (for static fields - for jni performance)
832 JNIid* jni_ids() { return _jni_ids; }
833 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
834 JNIid* jni_id_for(int offset);
835
836 public:
837 // maintenance of deoptimization dependencies
838 inline DependencyContext dependencies();
839 void mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes);
840 void add_dependent_nmethod(nmethod* nm);
841 void clean_dependency_context();
842 // Setup link to hierarchy and deoptimize
843 void add_to_hierarchy(JavaThread* current);
844
845 // On-stack replacement support
846 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
847 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
848 void add_osr_nmethod(nmethod* n);
849 bool remove_osr_nmethod(nmethod* n);
850 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m);
851 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
852
853 #if INCLUDE_JVMTI
854 // Breakpoint support (see methods on Method* for details)
855 BreakpointInfo* breakpoints() const { return _breakpoints; };
856 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
857 #endif
858
859 // support for stub routines
860 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); }
861 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
862 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); }
863
864 // subclass/subinterface checks
865 bool implements_interface(Klass* k) const;
866 bool is_same_or_direct_interface(Klass* k) const;
867
868 #ifdef ASSERT
869 // check whether this class or one of its superclasses was redefined
870 bool has_redefined_this_or_super() const;
871 #endif
872
873 // Access to the implementor of an interface.
874 InstanceKlass* implementor() const;
875 void set_implementor(InstanceKlass* ik);
876 int nof_implementors() const;
877 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
878 void init_implementor(); // initialize
879
880 private:
881 // link this class into the implementors list of every interface it implements
882 void process_interfaces();
883
884 public:
885 // virtual operations from Klass
886 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
887 Array<InstanceKlass*>* transitive_interfaces);
888 bool can_be_primary_super_slow() const;
889 size_t oop_size(oop obj) const { return size_helper(); }
890 // slow because it's a virtual call and used for verifying the layout_helper.
891 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
892 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
893
894 // Iterators
895 void do_local_static_fields(FieldClosure* cl);
896 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
897 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
898 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields
899
900 void methods_do(void f(Method* method));
901
902 static InstanceKlass* cast(Klass* k) {
903 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
904 }
905
906 static const InstanceKlass* cast(const Klass* k) {
907 assert(k != nullptr, "k should not be null");
908 assert(k->is_instance_klass(), "cast to InstanceKlass");
909 return static_cast<const InstanceKlass*>(k);
910 }
911
912 // This hides Klass::super(). The _super of an InstanceKlass is
913 // always an InstanceKlass (or nullptr)
914 InstanceKlass* super() const {
915 return (Klass::super() == nullptr) ? nullptr : InstanceKlass::cast(Klass::super());
916 }
917
918 virtual InstanceKlass* java_super() const {
919 return InstanceKlass::super();
920 }
921
922 // Sizing (in words)
923 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
924
925 static int size(int vtable_length, int itable_length,
926 int nonstatic_oop_map_size,
927 bool is_interface) {
928 return align_metadata_size(header_size() +
929 vtable_length +
930 itable_length +
931 nonstatic_oop_map_size +
932 (is_interface ? (int)sizeof(Klass*)/wordSize : 0));
933 }
934
935 int size() const { return size(vtable_length(),
936 itable_length(),
937 nonstatic_oop_map_size(),
938 is_interface());
939 }
940
941
942 inline intptr_t* start_of_itable() const;
943 inline intptr_t* end_of_itable() const;
944 inline oop static_field_base_raw();
945
946 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
947 inline Klass** end_of_nonstatic_oop_maps() const;
948
949 inline InstanceKlass* volatile* adr_implementor() const;
950
951 // Use this to return the size of an instance in heap words:
952 int size_helper() const {
953 return layout_helper_to_size_helper(layout_helper());
954 }
955
956 // This bit is initialized in classFileParser.cpp.
957 // It is false under any of the following conditions:
958 // - the class is abstract (including any interface)
959 // - the class size is larger than FastAllocateSizeLimit
960 // - the class is java/lang/Class, which cannot be allocated directly
961 bool can_be_fastpath_allocated() const {
962 return !layout_helper_needs_slow_path(layout_helper());
963 }
964
965 // Java itable
966 klassItable itable() const; // return klassItable wrapper
967 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
968 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
969 int vtable_index_of_interface_method(Method* method);
970
971 #if INCLUDE_JVMTI
972 void adjust_default_methods(bool* trace_name_printed);
973 #endif // INCLUDE_JVMTI
974
975 void clean_weak_instanceklass_links();
976 private:
977 void clean_implementors_list();
978 void clean_method_data();
979
980 public:
981 // Explicit metaspace deallocation of fields
982 // For RedefineClasses and class file parsing errors, we need to deallocate
983 // instanceKlasses and the metadata they point to.
984 void deallocate_contents(ClassLoaderData* loader_data);
985 static void deallocate_methods(ClassLoaderData* loader_data,
986 Array<Method*>* methods);
987 void static deallocate_interfaces(ClassLoaderData* loader_data,
988 const InstanceKlass* super_klass,
989 Array<InstanceKlass*>* local_interfaces,
990 Array<InstanceKlass*>* transitive_interfaces);
991 void static deallocate_record_components(ClassLoaderData* loader_data,
992 Array<RecordComponent*>* record_component);
993
994 virtual bool on_stack() const;
995
996 // callbacks for actions during class unloading
997 static void unload_class(InstanceKlass* ik);
998
999 virtual void release_C_heap_structures(bool release_sub_metadata = true);
1000
1001 // Naming
1002 const char* signature_name() const;
1003
1004 // Oop fields (and metadata) iterators
1005 //
1006 // The InstanceKlass iterators also visits the Object's klass.
1007
1008 // Forward iteration
1009 public:
1010 // Iterate over all oop fields in the oop maps.
1011 template <typename T, class OopClosureType>
1012 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1013
1014 // Iterate over all oop fields and metadata.
1015 template <typename T, class OopClosureType>
1016 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1017
1018 // Iterate over all oop fields in one oop map.
1019 template <typename T, class OopClosureType>
1020 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1021
1022
1023 // Reverse iteration
1024 // Iterate over all oop fields and metadata.
1025 template <typename T, class OopClosureType>
1026 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1027
1028 private:
1029 // Iterate over all oop fields in the oop maps.
1030 template <typename T, class OopClosureType>
1031 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1032
1033 // Iterate over all oop fields in one oop map.
1034 template <typename T, class OopClosureType>
1035 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1036
1037
1038 // Bounded range iteration
1039 public:
1040 // Iterate over all oop fields in the oop maps.
1041 template <typename T, class OopClosureType>
1042 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1043
1044 // Iterate over all oop fields and metadata.
1045 template <typename T, class OopClosureType>
1046 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1047
1048 private:
1049 // Iterate over all oop fields in one oop map.
1050 template <typename T, class OopClosureType>
1051 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1052
1053
1054 public:
1055 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1056
1057 private:
1058 // initialization state
1059 void set_init_state(ClassState state);
1060 void set_rewritten() { _misc_flags.set_rewritten(true); }
1061 void set_init_thread(JavaThread *thread) {
1062 assert((thread == JavaThread::current() && _init_thread == nullptr) ||
1063 (thread == nullptr && _init_thread == JavaThread::current()), "Only one thread is allowed to own initialization");
1064 AtomicAccess::store(&_init_thread, thread);
1065 }
1066
1067 jmethodID* methods_jmethod_ids_acquire() const;
1068 void release_set_methods_jmethod_ids(jmethodID* jmeths);
1069 // This nulls out obsolete jmethodIDs for all methods in 'klass'.
1070 static void clear_obsolete_jmethod_ids(InstanceKlass* klass);
1071 jmethodID update_jmethod_id(jmethodID* jmeths, Method* method, int idnum);
1072
1073 public:
1074 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1075 // Must be one per class and it has to be a VM internal object so java code
1076 // cannot lock it (like the mirror).
1077 // It has to be an object not a Mutex because it's held through java calls.
1078 oop init_lock() const;
1079
1080 // Returns the array class for the n'th dimension
1081 virtual ArrayKlass* array_klass(int n, TRAPS);
1082 virtual ArrayKlass* array_klass_or_null(int n);
1083
1084 // Returns the array class with this class as element type
1085 virtual ArrayKlass* array_klass(TRAPS);
1086 virtual ArrayKlass* array_klass_or_null();
1087
1088 static void clean_initialization_error_table();
1089 private:
1090 void fence_and_clear_init_lock();
1091
1092 bool link_class_impl (TRAPS);
1093 bool verify_code (TRAPS);
1094 void initialize_impl (TRAPS);
1095 void initialize_super_interfaces (TRAPS);
1096
1097 void add_initialization_error(JavaThread* current, Handle exception);
1098 oop get_initialization_error(JavaThread* current);
1099
1100 // find a local method (returns null if not found)
1101 Method* find_method_impl(const Symbol* name,
1102 const Symbol* signature,
1103 OverpassLookupMode overpass_mode,
1104 StaticLookupMode static_mode,
1105 PrivateLookupMode private_mode) const;
1106
1107 static Method* find_method_impl(const Array<Method*>* methods,
1108 const Symbol* name,
1109 const Symbol* signature,
1110 OverpassLookupMode overpass_mode,
1111 StaticLookupMode static_mode,
1112 PrivateLookupMode private_mode);
1113
1114 #if INCLUDE_JVMTI
1115 // RedefineClasses support
1116 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1117 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1118 #endif
1119 // log class name to classlist
1120 void log_to_classlist() const;
1121 public:
1122
1123 #if INCLUDE_CDS
1124 // CDS support - remove and restore oops from metadata. Oops are not shared.
1125 virtual void remove_unshareable_info();
1126 void remove_unshareable_flags();
1127 virtual void remove_java_mirror();
1128 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS);
1129 void init_shared_package_entry();
1130 bool can_be_verified_at_dumptime() const;
1131 void compute_has_loops_flag_for_methods();
1132 #endif
1133 bool has_init_deps_processed() const { return _misc_flags.has_init_deps_processed(); }
1134 void set_has_init_deps_processed() {
1135 assert(is_initialized(), "");
1136 assert(!has_init_deps_processed(), "already set"); // one-off action
1137 _misc_flags.set_has_init_deps_processed(true);
1138 }
1139
1140 u2 compute_modifier_flags() const;
1141
1142 public:
1143 // JVMTI support
1144 jint jvmti_class_status() const;
1145
1146 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1147
1148 public:
1149 // Printing
1150 void print_on(outputStream* st) const;
1151 void print_value_on(outputStream* st) const;
1152
1153 void oop_print_value_on(oop obj, outputStream* st);
1154
1155 void oop_print_on (oop obj, outputStream* st);
1156
1157 #ifndef PRODUCT
1158 void print_dependent_nmethods(bool verbose = false);
1159 bool is_dependent_nmethod(nmethod* nm);
1160 bool verify_itable_index(int index);
1161 #endif
1162
1163 const char* internal_name() const;
1164
1165 // Verification
1166 void verify_on(outputStream* st);
1167
1168 void oop_verify_on(oop obj, outputStream* st);
1169
1170 // Logging
1171 void print_class_load_logging(ClassLoaderData* loader_data,
1172 const ModuleEntry* module_entry,
1173 const ClassFileStream* cfs) const;
1174 private:
1175 void print_class_load_cause_logging() const;
1176 void print_class_load_helper(ClassLoaderData* loader_data,
1177 const ModuleEntry* module_entry,
1178 const ClassFileStream* cfs) const;
1179 };
1180
1181 // for adding methods
1182 // UNSET_IDNUM return means no more ids available
1183 inline u2 InstanceKlass::next_method_idnum() {
1184 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1185 return ConstMethod::UNSET_IDNUM; // no more ids available
1186 } else {
1187 return _idnum_allocated_count++;
1188 }
1189 }
1190
1191 class PrintClassClosure : public KlassClosure {
1192 private:
1193 outputStream* _st;
1194 bool _verbose;
1195 public:
1196 PrintClassClosure(outputStream* st, bool verbose);
1197
1198 void do_klass(Klass* k);
1199 };
1200
1201 /* JNIid class for jfieldIDs only */
1202 class JNIid: public CHeapObj<mtClass> {
1203 friend class VMStructs;
1204 private:
1205 InstanceKlass* _holder;
1206 JNIid* _next;
1207 int _offset;
1208 #ifdef ASSERT
1209 bool _is_static_field_id;
1210 #endif
1211
1212 public:
1213 // Accessors
1214 InstanceKlass* holder() const { return _holder; }
1215 int offset() const { return _offset; }
1216 JNIid* next() { return _next; }
1217 // Constructor
1218 JNIid(InstanceKlass* holder, int offset, JNIid* next);
1219 // Identifier lookup
1220 JNIid* find(int offset);
1221
1222 bool find_local_field(fieldDescriptor* fd) {
1223 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1224 }
1225
1226 static void deallocate(JNIid* id);
1227 // Debugging
1228 #ifdef ASSERT
1229 bool is_static_field_id() const { return _is_static_field_id; }
1230 void set_is_static_field_id() { _is_static_field_id = true; }
1231 #endif
1232 void verify(InstanceKlass* holder);
1233 };
1234
1235 // An iterator that's used to access the inner classes indices in the
1236 // InstanceKlass::_inner_classes array.
1237 class InnerClassesIterator : public StackObj {
1238 private:
1239 Array<jushort>* _inner_classes;
1240 int _length;
1241 int _idx;
1242 public:
1243
1244 InnerClassesIterator(const InstanceKlass* k) {
1245 _inner_classes = k->inner_classes();
1246 if (k->inner_classes() != nullptr) {
1247 _length = _inner_classes->length();
1248 // The inner class array's length should be the multiple of
1249 // inner_class_next_offset if it only contains the InnerClasses
1250 // attribute data, or it should be
1251 // n*inner_class_next_offset+enclosing_method_attribute_size
1252 // if it also contains the EnclosingMethod data.
1253 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1254 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1255 "just checking");
1256 // Remove the enclosing_method portion if exists.
1257 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1258 _length -= InstanceKlass::enclosing_method_attribute_size;
1259 }
1260 } else {
1261 _length = 0;
1262 }
1263 _idx = 0;
1264 }
1265
1266 int length() const {
1267 return _length;
1268 }
1269
1270 void next() {
1271 _idx += InstanceKlass::inner_class_next_offset;
1272 }
1273
1274 bool done() const {
1275 return (_idx >= _length);
1276 }
1277
1278 u2 inner_class_info_index() const {
1279 return _inner_classes->at(
1280 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1281 }
1282
1283 void set_inner_class_info_index(u2 index) {
1284 _inner_classes->at_put(
1285 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1286 }
1287
1288 u2 outer_class_info_index() const {
1289 return _inner_classes->at(
1290 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1291 }
1292
1293 void set_outer_class_info_index(u2 index) {
1294 _inner_classes->at_put(
1295 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1296 }
1297
1298 u2 inner_name_index() const {
1299 return _inner_classes->at(
1300 _idx + InstanceKlass::inner_class_inner_name_offset);
1301 }
1302
1303 void set_inner_name_index(u2 index) {
1304 _inner_classes->at_put(
1305 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1306 }
1307
1308 u2 inner_access_flags() const {
1309 return _inner_classes->at(
1310 _idx + InstanceKlass::inner_class_access_flags_offset);
1311 }
1312 };
1313
1314 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal.
1315 // Usage:
1316 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) {
1317 // Klass* k = iter.klass();
1318 // ...
1319 // }
1320 class ClassHierarchyIterator : public StackObj {
1321 private:
1322 InstanceKlass* _root;
1323 Klass* _current;
1324 bool _visit_subclasses;
1325
1326 public:
1327 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) {
1328 assert(_root == _current, "required"); // initial state
1329 }
1330
1331 bool done() {
1332 return (_current == nullptr);
1333 }
1334
1335 // Make a step iterating over the class hierarchy under the root class.
1336 // Skips subclasses if requested.
1337 void next();
1338
1339 Klass* klass() {
1340 assert(!done(), "sanity");
1341 return _current;
1342 }
1343
1344 // Skip subclasses of the current class.
1345 void skip_subclasses() {
1346 _visit_subclasses = false;
1347 }
1348 };
1349
1350 #endif // SHARE_OOPS_INSTANCEKLASS_HPP