1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_OOPS_INSTANCEKLASS_HPP
27
28 #include "code/vmreg.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceKlassMiscStatus.hpp"
34 #include "oops/instanceOop.hpp"
35 #include "runtime/handles.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/align.hpp"
38 #include "utilities/macros.hpp"
39 #if INCLUDE_JFR
40 #include "jfr/support/jfrKlassExtension.hpp"
41 #endif
42
43 class klassItable;
44 class RecordComponent;
45
46 // An InstanceKlass is the VM level representation of a Java class.
47 // It contains all information needed for at class at execution runtime.
48
49 // InstanceKlass embedded field layout (after declared fields):
50 // [EMBEDDED Java vtable ] size in words = vtable_len
51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
52 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
53 // indicating where oops are located in instances of this klass.
54 // [EMBEDDED implementor of the interface] only exist for interface
55 // [EMBEDDED inline_type_field_klasses] only if has_inline_fields() == true
56 // [EMBEDDED InlineKlassFixedBlock] only if is an InlineKlass instance
57
58
59 // forward declaration for class -- see below for definition
60 #if INCLUDE_JVMTI
61 class BreakpointInfo;
62 #endif
63 class ClassFileParser;
64 class ClassFileStream;
65 class KlassDepChange;
66 class DependencyContext;
67 class fieldDescriptor;
68 class jniIdMapBase;
69 class JNIid;
70 class JvmtiCachedClassFieldMap;
71 class nmethodBucket;
72 class OopMapCache;
73 class BufferedInlineTypeBlob;
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 = NULL) : _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 const 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 SigEntry;
135
136 class InlineKlassFixedBlock {
137 Array<SigEntry>** _extended_sig;
138 Array<VMRegPair>** _return_regs;
139 address* _pack_handler;
140 address* _pack_handler_jobject;
141 address* _unpack_handler;
142 int* _default_value_offset;
143 ArrayKlass** _null_free_inline_array_klasses;
144 int _alignment;
145 int _first_field_offset;
146 int _exact_size_in_bytes;
147
148 friend class InlineKlass;
149 };
150
151 class InstanceKlass: public Klass {
152 friend class VMStructs;
153 friend class JVMCIVMStructs;
154 friend class ClassFileParser;
155 friend class CompileReplay;
156 friend class TemplateTable;
157
158 public:
159 static const KlassKind Kind = InstanceKlassKind;
160
161 protected:
162 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE);
163
164 public:
165 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
166
167 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
168 // of the class loading & initialization procedure, and the use of the states.
169 enum ClassState : u1 {
170 allocated, // allocated (but not yet linked)
171 loaded, // loaded and inserted in class hierarchy (but not linked yet)
172 being_linked, // currently running verifier and rewriter
173 linked, // successfully linked/verified (but not initialized yet)
174 being_initialized, // currently running class initializer
175 fully_initialized, // initialized (successful final state)
176 initialization_error // error happened during initialization
177 };
178
179 private:
180 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
181
182 protected:
183 // If you add a new field that points to any metaspace object, you
184 // must add this field to InstanceKlass::metaspace_pointers_do().
185
186 // Annotations for this class
187 Annotations* _annotations;
188 // Package this class is defined in
189 PackageEntry* _package_entry;
190 // Array classes holding elements of this class.
191 ArrayKlass* volatile _array_klasses;
192 // Constant pool for this class.
193 ConstantPool* _constants;
194 // The InnerClasses attribute and EnclosingMethod attribute. The
195 // _inner_classes is an array of shorts. If the class has InnerClasses
196 // attribute, then the _inner_classes array begins with 4-tuples of shorts
197 // [inner_class_info_index, outer_class_info_index,
198 // inner_name_index, inner_class_access_flags] for the InnerClasses
199 // attribute. If the EnclosingMethod attribute exists, it occupies the
200 // last two shorts [class_index, method_index] of the array. If only
201 // the InnerClasses attribute exists, the _inner_classes array length is
202 // number_of_inner_classes * 4. If the class has both InnerClasses
203 // and EnclosingMethod attributes the _inner_classes array length is
204 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
205 Array<jushort>* _inner_classes;
206
207 // The NestMembers attribute. An array of shorts, where each is a
208 // class info index for the class that is a nest member. This data
209 // has not been validated.
210 Array<jushort>* _nest_members;
211
212 // Resolved nest-host klass: either true nest-host or self if we are not
213 // nested, or an error occurred resolving or validating the nominated
214 // nest-host. Can also be set directly by JDK API's that establish nest
215 // relationships.
216 // By always being set it makes nest-member access checks simpler.
217 InstanceKlass* _nest_host;
218
219 // The PermittedSubclasses attribute. An array of shorts, where each is a
220 // class info index for the class that is a permitted subclass.
221 Array<jushort>* _permitted_subclasses;
222
223 // The contents of the Record attribute.
224 Array<RecordComponent*>* _record_components;
225
226 // the source debug extension for this klass, NULL if not specified.
227 // Specified as UTF-8 string without terminating zero byte in the classfile,
228 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
229 const char* _source_debug_extension;
230
231 // Number of heapOopSize words used by non-static fields in this klass
232 // (including inherited fields but after header_size()).
233 int _nonstatic_field_size;
234 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
235 int _nonstatic_oop_map_size; // size in words of nonstatic oop map blocks
236 int _itable_len; // length of Java itable (in words)
237
238 // The NestHost attribute. The class info index for the class
239 // that is the nest-host of this class. This data has not been validated.
240 u2 _nest_host_index;
241 u2 _this_class_index; // constant pool entry
242 u2 _static_oop_field_count; // number of static oop fields in this klass
243 u2 _java_fields_count; // The number of declared Java fields
244
245 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
246
247 // _is_marked_dependent can be set concurrently, thus cannot be part of the
248 // _misc_status right now.
249 bool _is_marked_dependent; // used for marking during flushing and deoptimization
250
251 ClassState _init_state; // state of class
252
253 u1 _reference_type; // reference type
254
255 // State is set while executing, eventually atomically to not disturb other state
256 InstanceKlassMiscStatus _misc_status;
257
258 Monitor* _init_monitor; // mutual exclusion to _init_state and _init_thread.
259 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
260
261 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
262 JNIid* _jni_ids; // First JNI identifier for static fields in this class
263 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
264 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
265 uint64_t volatile _dep_context_last_cleaned;
266 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
267 #if INCLUDE_JVMTI
268 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
269 // Linked instanceKlasses of previous versions
270 InstanceKlass* _previous_versions;
271 // JVMTI fields can be moved to their own structure - see 6315920
272 // JVMTI: cached class file, before retransformable agent modified it in CFLH
273 JvmtiCachedClassFileData* _cached_class_file;
274 #endif
275
276 #if INCLUDE_JVMTI
277 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
278 #endif
279
280 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
281
282 // Method array.
283 Array<Method*>* _methods;
284 // Default Method Array, concrete methods inherited from interfaces
285 Array<Method*>* _default_methods;
286 // Interfaces (InstanceKlass*s) this class declares locally to implement.
287 Array<InstanceKlass*>* _local_interfaces;
288 // Interfaces (InstanceKlass*s) this class implements transitively.
289 Array<InstanceKlass*>* _transitive_interfaces;
290 // Int array containing the original order of method in the class file (for JVMTI).
291 Array<int>* _method_ordering;
292 // Int array containing the vtable_indices for default_methods
293 // offset matches _default_methods offset
294 Array<int>* _default_vtable_indices;
295
296 // Instance and static variable information, starts with 6-tuples of shorts
297 // [access, name index, sig index, initval index, low_offset, high_offset]
298 // for all fields, followed by the generic signature data at the end of
299 // the array. Only fields with generic signature attributes have the generic
300 // signature data set in the array. The fields array looks like following:
301 //
302 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
303 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
304 // ...
305 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
306 // [generic signature index]
307 // [generic signature index]
308 // ...
309 Array<u2>* _fields;
310 const Klass** _inline_type_field_klasses; // For "inline class" fields, NULL if none present
311 Array<u2>* _preload_classes;
312 const InlineKlassFixedBlock* _adr_inlineklass_fixed_block;
313
314 // embedded Java vtable follows here
315 // embedded Java itables follows here
316 // embedded static fields follows here
317 // embedded nonstatic oop-map blocks follows here
318 // embedded implementor of this interface follows here
319 // The embedded implementor only exists if the current klass is an
320 // interface. The possible values of the implementor fall into following
321 // three cases:
322 // NULL: no implementor.
323 // A Klass* that's not itself: one implementor.
324 // Itself: more than one implementors.
325 //
326
327 friend class SystemDictionary;
328
329 static bool _disable_method_binary_search;
330
331 // Controls finalizer registration
332 static bool _finalization_enabled;
333
334 public:
335
336 // Queries finalization state
337 static bool is_finalization_enabled() { return _finalization_enabled; }
338
339 // Sets finalization state
340 static void set_finalization_enabled(bool val) { _finalization_enabled = val; }
341
342 // The three BUILTIN class loader types
343 bool is_shared_boot_class() const { return _misc_status.is_shared_boot_class(); }
344 bool is_shared_platform_class() const { return _misc_status.is_shared_platform_class(); }
345 bool is_shared_app_class() const { return _misc_status.is_shared_app_class(); }
346 // The UNREGISTERED class loader type
347 bool is_shared_unregistered_class() const { return _misc_status.is_shared_unregistered_class(); }
348
349 // Check if the class can be shared in CDS
350 bool is_shareable() const;
351
352 bool shared_loading_failed() const { return _misc_status.shared_loading_failed(); }
353
354 void set_shared_loading_failed() { _misc_status.set_shared_loading_failed(true); }
355
356 #if INCLUDE_CDS
357 void set_shared_class_loader_type(s2 loader_type) { _misc_status.set_shared_class_loader_type(loader_type); }
358 void assign_class_loader_type() { _misc_status.assign_class_loader_type(_class_loader_data); }
359 #endif
360
361 bool has_nonstatic_fields() const { return _misc_status.has_nonstatic_fields(); }
362 void set_has_nonstatic_fields(bool b) { _misc_status.set_has_nonstatic_fields(b); }
363
364 bool has_inline_type_fields() const { return _misc_status.has_inline_type_fields(); }
365 void set_has_inline_type_fields() { _misc_status.set_has_inline_type_fields(true); }
366
367 bool is_empty_inline_type() const { return _misc_status.is_empty_inline_type(); }
368 void set_is_empty_inline_type() { _misc_status.set_is_empty_inline_type(true); }
369
370 // Note: The naturally_atomic property only applies to
371 // inline classes; it is never true on identity classes.
372 // The bit is placed on instanceKlass for convenience.
373
374 // Query if h/w provides atomic load/store for instances.
375 bool is_naturally_atomic() const { return _misc_status.is_naturally_atomic(); }
376 void set_is_naturally_atomic() { _misc_status.set_is_naturally_atomic(true); }
377
378 // Query if this class implements jl.NonTearable or was
379 // mentioned in the JVM option ForceNonTearable.
380 // This bit can occur anywhere, but is only significant
381 // for inline classes *and* their super types.
382 // It inherits from supers along with NonTearable.
383 bool is_declared_atomic() const { return _misc_status.is_declared_atomic(); }
384 void set_is_declared_atomic() { _misc_status.set_is_declared_atomic(true); }
385
386 bool carries_value_modifier() const { return _misc_status.carries_value_modifier(); }
387 void set_carries_value_modifier() { _misc_status.set_carries_value_modifier(true); }
388
389 bool carries_identity_modifier() const { return _misc_status.carries_identity_modifier(); }
390 void set_carries_identity_modifier() { _misc_status.set_carries_identity_modifier(true); }
391
392 // field sizes
393 int nonstatic_field_size() const { return _nonstatic_field_size; }
394 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
395
396 int static_field_size() const { return _static_field_size; }
397 void set_static_field_size(int size) { _static_field_size = size; }
398
399 int static_oop_field_count() const { return (int)_static_oop_field_count; }
400 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
401
402 // Java itable
403 int itable_length() const { return _itable_len; }
404 void set_itable_length(int len) { _itable_len = len; }
405
406 // array klasses
407 ArrayKlass* array_klasses() const { return _array_klasses; }
408 inline ArrayKlass* array_klasses_acquire() const; // load with acquire semantics
409 inline void release_set_array_klasses(ArrayKlass* k); // store with release semantics
410
411 // methods
412 Array<Method*>* methods() const { return _methods; }
413 void set_methods(Array<Method*>* a) { _methods = a; }
414 Method* method_with_idnum(int idnum);
415 Method* method_with_orig_idnum(int idnum);
416 Method* method_with_orig_idnum(int idnum, int version);
417
418 // method ordering
419 Array<int>* method_ordering() const { return _method_ordering; }
420 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
421 void copy_method_ordering(const intArray* m, TRAPS);
422
423 // default_methods
424 Array<Method*>* default_methods() const { return _default_methods; }
425 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
426
427 // default method vtable_indices
428 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
429 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
430 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
431
432 // interfaces
433 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
434 void set_local_interfaces(Array<InstanceKlass*>* a) {
435 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
436 _local_interfaces = a; }
437
438 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
439 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
440 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
441 _transitive_interfaces = a;
442 }
443
444 private:
445 friend class fieldDescriptor;
446 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
447
448 public:
449 int field_offset (int index) const { return field(index)->offset(); }
450 int field_access_flags(int index) const { return field(index)->access_flags(); }
451 Symbol* field_name (int index) const { return field(index)->name(constants()); }
452 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
453 bool field_is_inlined(int index) const { return field(index)->is_inlined(); }
454 bool field_is_null_free_inline_type(int index) const;
455
456 // Number of Java declared fields
457 int java_fields_count() const { return (int)_java_fields_count; }
458
459 Array<u2>* fields() const { return _fields; }
460 void set_fields(Array<u2>* f, u2 java_fields_count) {
461 guarantee(_fields == NULL || f == NULL, "Just checking");
462 _fields = f;
463 _java_fields_count = java_fields_count;
464 }
465
466 Array<u2>* preload_classes() const { return _preload_classes; }
467 void set_preload_classes(Array<u2>* c) { _preload_classes = c; }
468
469 // inner classes
470 Array<u2>* inner_classes() const { return _inner_classes; }
471 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
472
473 // nest members
474 Array<u2>* nest_members() const { return _nest_members; }
475 void set_nest_members(Array<u2>* m) { _nest_members = m; }
476
477 // nest-host index
478 jushort nest_host_index() const { return _nest_host_index; }
479 void set_nest_host_index(u2 i) { _nest_host_index = i; }
480 // dynamic nest member support
481 void set_nest_host(InstanceKlass* host);
482
483 // record components
484 Array<RecordComponent*>* record_components() const { return _record_components; }
485 void set_record_components(Array<RecordComponent*>* record_components) {
486 _record_components = record_components;
487 }
488 bool is_record() const;
489
490 // permitted subclasses
491 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; }
492 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; }
493
494 private:
495 // Called to verify that k is a member of this nest - does not look at k's nest-host,
496 // nor does it resolve any CP entries or load any classes.
497 bool has_nest_member(JavaThread* current, InstanceKlass* k) const;
498
499 public:
500 // Call this only if you know that the nest host has been initialized.
501 InstanceKlass* nest_host_not_null() {
502 assert(_nest_host != NULL, "must be");
503 return _nest_host;
504 }
505 // Used to construct informative IllegalAccessError messages at a higher level,
506 // if there was an issue resolving or validating the nest host.
507 // Returns NULL if there was no error.
508 const char* nest_host_error();
509 // Returns nest-host class, resolving and validating it if needed.
510 // Returns NULL if resolution is not possible from the calling context.
511 InstanceKlass* nest_host(TRAPS);
512 // Check if this klass is a nestmate of k - resolves this nest-host and k's
513 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
514
515 // Called to verify that k is a permitted subclass of this class
516 bool has_as_permitted_subclass(const InstanceKlass* k) const;
517
518 enum InnerClassAttributeOffset {
519 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
520 inner_class_inner_class_info_offset = 0,
521 inner_class_outer_class_info_offset = 1,
522 inner_class_inner_name_offset = 2,
523 inner_class_access_flags_offset = 3,
524 inner_class_next_offset = 4
525 };
526
527 enum EnclosingMethodAttributeOffset {
528 enclosing_method_class_index_offset = 0,
529 enclosing_method_method_index_offset = 1,
530 enclosing_method_attribute_size = 2
531 };
532
533 // package
534 PackageEntry* package() const { return _package_entry; }
535 ModuleEntry* module() const;
536 bool in_unnamed_package() const { return (_package_entry == NULL); }
537 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS);
538 // If the package for the InstanceKlass is in the boot loader's package entry
539 // table then sets the classpath_index field so that
540 // get_system_package() will know to return a non-null value for the
541 // package's location. And, so that the package will be added to the list of
542 // packages returned by get_system_packages().
543 // For packages whose classes are loaded from the boot loader class path, the
544 // classpath_index indicates which entry on the boot loader class path.
545 void set_classpath_index(s2 path_index);
546 bool is_same_class_package(const Klass* class2) const;
547 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
548
549 // find an enclosing class
550 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
551
552 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
553 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
554
555 private:
556 // Check prohibited package ("java/" only loadable by boot or platform loaders)
557 static void check_prohibited_package(Symbol* class_name,
558 ClassLoaderData* loader_data,
559 TRAPS);
560 public:
561 // initialization state
562 bool is_loaded() const { return init_state() >= loaded; }
563 bool is_linked() const { return init_state() >= linked; }
564 bool is_being_linked() const { return init_state() == being_linked; }
565 bool is_initialized() const { return init_state() == fully_initialized; }
566 bool is_not_initialized() const { return init_state() < being_initialized; }
567 bool is_being_initialized() const { return init_state() == being_initialized; }
568 bool is_in_error_state() const { return init_state() == initialization_error; }
569 bool is_init_thread(Thread *thread) { return thread == _init_thread; }
570 ClassState init_state() const { return Atomic::load(&_init_state); }
571 const char* init_state_name() const;
572 bool is_rewritten() const { return _misc_status.rewritten(); }
573
574 class LockLinkState : public StackObj {
575 InstanceKlass* _ik;
576 JavaThread* _current;
577 public:
578 LockLinkState(InstanceKlass* ik, JavaThread* current) : _ik(ik), _current(current) {
579 ik->check_link_state_and_wait(current);
580 }
581 ~LockLinkState() {
582 if (!_ik->is_linked()) {
583 // Reset to loaded if linking failed.
584 _ik->set_initialization_state_and_notify(loaded, _current);
585 }
586 }
587 };
588
589 // is this a sealed class
590 bool is_sealed() const;
591
592 // defineClass specified verification
593 bool should_verify_class() const { return _misc_status.should_verify_class(); }
594 void set_should_verify_class(bool value) { _misc_status.set_should_verify_class(value); }
595
596 // marking
597 bool is_marked_dependent() const { return _is_marked_dependent; }
598 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
599
600 static ByteSize kind_offset() { return in_ByteSize(offset_of(InstanceKlass, _kind)); }
601 static ByteSize misc_status_offset() { return in_ByteSize(offset_of(InstanceKlass, _misc_status)); }
602
603 // initialization (virtuals from Klass)
604 bool should_be_initialized() const; // means that initialize should be called
605 void initialize(TRAPS);
606 void link_class(TRAPS);
607 bool link_class_or_fail(TRAPS); // returns false on failure
608 void rewrite_class(TRAPS);
609 void link_methods(TRAPS);
610 Method* class_initializer() const;
611
612 // reference type
613 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
614
615 // this class cp index
616 u2 this_class_index() const { return _this_class_index; }
617 void set_this_class_index(u2 index) { _this_class_index = index; }
618
619 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
620
621 // find local field, returns true if found
622 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
623 // find field in direct superinterfaces, returns the interface in which the field is defined
624 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
625 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
626 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
627 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
628 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
629
630 // find a non-static or static field given its offset within the class.
631 bool contains_field_offset(int offset);
632
633 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
634 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
635
636 private:
637 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
638
639 public:
640 static void disable_method_binary_search() {
641 _disable_method_binary_search = true;
642 }
643
644 // find a local method (returns NULL if not found)
645 Method* find_method(const Symbol* name, const Symbol* signature) const;
646 static Method* find_method(const Array<Method*>* methods,
647 const Symbol* name,
648 const Symbol* signature);
649
650 // find a local method, but skip static methods
651 Method* find_instance_method(const Symbol* name, const Symbol* signature,
652 PrivateLookupMode private_mode) const;
653 static Method* find_instance_method(const Array<Method*>* methods,
654 const Symbol* name,
655 const Symbol* signature,
656 PrivateLookupMode private_mode);
657
658 // find a local method (returns NULL if not found)
659 Method* find_local_method(const Symbol* name,
660 const Symbol* signature,
661 OverpassLookupMode overpass_mode,
662 StaticLookupMode static_mode,
663 PrivateLookupMode private_mode) const;
664
665 // find a local method from given methods array (returns NULL if not found)
666 static Method* find_local_method(const Array<Method*>* methods,
667 const Symbol* name,
668 const Symbol* signature,
669 OverpassLookupMode overpass_mode,
670 StaticLookupMode static_mode,
671 PrivateLookupMode private_mode);
672
673 // find a local method index in methods or default_methods (returns -1 if not found)
674 static int find_method_index(const Array<Method*>* methods,
675 const Symbol* name,
676 const Symbol* signature,
677 OverpassLookupMode overpass_mode,
678 StaticLookupMode static_mode,
679 PrivateLookupMode private_mode);
680
681 // lookup operation (returns NULL if not found)
682 Method* uncached_lookup_method(const Symbol* name,
683 const Symbol* signature,
684 OverpassLookupMode overpass_mode,
685 PrivateLookupMode private_mode = PrivateLookupMode::find) const;
686
687 // lookup a method in all the interfaces that this class implements
688 // (returns NULL if not found)
689 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
690
691 // lookup a method in local defaults then in all interfaces
692 // (returns NULL if not found)
693 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
694
695 // Find method indices by name. If a method with the specified name is
696 // found the index to the first method is returned, and 'end' is filled in
697 // with the index of first non-name-matching method. If no method is found
698 // -1 is returned.
699 int find_method_by_name(const Symbol* name, int* end) const;
700 static int find_method_by_name(const Array<Method*>* methods,
701 const Symbol* name, int* end);
702
703 // constant pool
704 ConstantPool* constants() const { return _constants; }
705 void set_constants(ConstantPool* c) { _constants = c; }
706
707 // protection domain
708 oop protection_domain() const;
709
710 // signers
711 objArrayOop signers() const;
712
713 bool is_contended() const { return _misc_status.is_contended(); }
714 void set_is_contended(bool value) { _misc_status.set_is_contended(value); }
715
716 // source file name
717 Symbol* source_file_name() const { return _constants->source_file_name(); }
718 u2 source_file_name_index() const { return _constants->source_file_name_index(); }
719 void set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
720
721 // minor and major version numbers of class file
722 u2 minor_version() const { return _constants->minor_version(); }
723 void set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
724 u2 major_version() const { return _constants->major_version(); }
725 void set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
726
727 // source debug extension
728 const char* source_debug_extension() const { return _source_debug_extension; }
729 void set_source_debug_extension(const char* array, int length);
730
731 // nonstatic oop-map blocks
732 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
733 return oop_map_count * OopMapBlock::size_in_words();
734 }
735 unsigned int nonstatic_oop_map_count() const {
736 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
737 }
738 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
739 void set_nonstatic_oop_map_size(int words) {
740 _nonstatic_oop_map_size = words;
741 }
742
743 bool has_contended_annotations() const { return _misc_status.has_contended_annotations(); }
744 void set_has_contended_annotations(bool value) { _misc_status.set_has_contended_annotations(value); }
745
746 #if INCLUDE_JVMTI
747 // Redefinition locking. Class can only be redefined by one thread at a time.
748 // The flag is in access_flags so that it can be set and reset using atomic
749 // operations, and not be reset by other misc_flag settings.
750 bool is_being_redefined() const {
751 return _access_flags.is_being_redefined();
752 }
753 void set_is_being_redefined(bool value) {
754 if (value) {
755 _access_flags.set_is_being_redefined();
756 } else {
757 _access_flags.clear_is_being_redefined();
758 }
759 }
760
761 // RedefineClasses() support for previous versions:
762 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
763 void purge_previous_version_list();
764
765 InstanceKlass* previous_versions() const { return _previous_versions; }
766 #else
767 InstanceKlass* previous_versions() const { return NULL; }
768 #endif
769
770 InstanceKlass* get_klass_version(int version) {
771 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
772 if (ik->constants()->version() == version) {
773 return ik;
774 }
775 }
776 return NULL;
777 }
778
779 bool has_been_redefined() const { return _misc_status.has_been_redefined(); }
780 void set_has_been_redefined() { _misc_status.set_has_been_redefined(true); }
781
782 bool is_scratch_class() const { return _misc_status.is_scratch_class(); }
783 void set_is_scratch_class() { _misc_status.set_is_scratch_class(true); }
784
785 bool has_resolved_methods() const {
786 return _access_flags.has_resolved_methods();
787 }
788
789 void set_has_resolved_methods() {
790 _access_flags.set_has_resolved_methods();
791 }
792
793 public:
794 #if INCLUDE_JVMTI
795
796 void init_previous_versions() {
797 _previous_versions = NULL;
798 }
799
800 private:
801 static bool _has_previous_versions;
802 public:
803 static void purge_previous_versions(InstanceKlass* ik) {
804 if (ik->has_been_redefined()) {
805 ik->purge_previous_version_list();
806 }
807 }
808
809 static bool has_previous_versions_and_reset();
810 static bool has_previous_versions() { return _has_previous_versions; }
811
812 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
813 void set_cached_class_file(JvmtiCachedClassFileData *data) {
814 _cached_class_file = data;
815 }
816 JvmtiCachedClassFileData * get_cached_class_file();
817 jint get_cached_class_file_len();
818 unsigned char * get_cached_class_file_bytes();
819
820 // JVMTI: Support for caching of field indices, types, and offsets
821 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
822 _jvmti_cached_class_field_map = descriptor;
823 }
824 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
825 return _jvmti_cached_class_field_map;
826 }
827 #else // INCLUDE_JVMTI
828
829 static void purge_previous_versions(InstanceKlass* ik) { return; };
830 static bool has_previous_versions_and_reset() { return false; }
831
832 void set_cached_class_file(JvmtiCachedClassFileData *data) {
833 assert(data == NULL, "unexpected call with JVMTI disabled");
834 }
835 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
836
837 #endif // INCLUDE_JVMTI
838
839 bool has_nonstatic_concrete_methods() const { return _misc_status.has_nonstatic_concrete_methods(); }
840 void set_has_nonstatic_concrete_methods(bool b) { _misc_status.set_has_nonstatic_concrete_methods(b); }
841
842 bool declares_nonstatic_concrete_methods() const { return _misc_status.declares_nonstatic_concrete_methods(); }
843 void set_declares_nonstatic_concrete_methods(bool b) { _misc_status.set_declares_nonstatic_concrete_methods(b); }
844
845 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
846 inline u2 next_method_idnum();
847 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
848
849 // generics support
850 Symbol* generic_signature() const { return _constants->generic_signature(); }
851 u2 generic_signature_index() const { return _constants->generic_signature_index(); }
852 void set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
853
854 u2 enclosing_method_data(int offset) const;
855 u2 enclosing_method_class_index() const {
856 return enclosing_method_data(enclosing_method_class_index_offset);
857 }
858 u2 enclosing_method_method_index() {
859 return enclosing_method_data(enclosing_method_method_index_offset);
860 }
861 void set_enclosing_method_indices(u2 class_index,
862 u2 method_index);
863
864 // jmethodID support
865 jmethodID get_jmethod_id(const methodHandle& method_h);
866 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
867 jmethodID new_id, jmethodID* new_jmeths,
868 jmethodID* to_dealloc_id_p,
869 jmethodID** to_dealloc_jmeths_p);
870 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
871 size_t *length_p, jmethodID* id_p);
872 void ensure_space_for_methodids(int start_offset = 0);
873 jmethodID jmethod_id_or_null(Method* method);
874
875 // annotations support
876 Annotations* annotations() const { return _annotations; }
877 void set_annotations(Annotations* anno) { _annotations = anno; }
878
879 AnnotationArray* class_annotations() const {
880 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
881 }
882 Array<AnnotationArray*>* fields_annotations() const {
883 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
884 }
885 AnnotationArray* class_type_annotations() const {
886 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
887 }
888 Array<AnnotationArray*>* fields_type_annotations() const {
889 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
890 }
891 // allocation
892 instanceOop allocate_instance(TRAPS);
893 static instanceOop allocate_instance(oop cls, TRAPS);
894
895 // additional member function to return a handle
896 instanceHandle allocate_instance_handle(TRAPS);
897
898 objArrayOop allocate_objArray(int n, int length, TRAPS);
899 // Helper function
900 static instanceOop register_finalizer(instanceOop i, TRAPS);
901
902 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
903 // if not, throw either an Error or an Exception.
904 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
905
906 // initialization
907 void call_class_initializer(TRAPS);
908 void set_initialization_state_and_notify(ClassState state, JavaThread* current);
909
910 // OopMapCache support
911 OopMapCache* oop_map_cache() { return _oop_map_cache; }
912 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
913 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
914
915 // JNI identifier support (for static fields - for jni performance)
916 JNIid* jni_ids() { return _jni_ids; }
917 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
918 JNIid* jni_id_for(int offset);
919
920 // maintenance of deoptimization dependencies
921 inline DependencyContext dependencies();
922 int mark_dependent_nmethods(KlassDepChange& changes);
923 void add_dependent_nmethod(nmethod* nm);
924 void clean_dependency_context();
925
926 // On-stack replacement support
927 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
928 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
929 void add_osr_nmethod(nmethod* n);
930 bool remove_osr_nmethod(nmethod* n);
931 int mark_osr_nmethods(const Method* m);
932 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
933
934 #if INCLUDE_JVMTI
935 // Breakpoint support (see methods on Method* for details)
936 BreakpointInfo* breakpoints() const { return _breakpoints; };
937 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
938 #endif
939
940 // support for stub routines
941 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
942 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
943 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
944
945 static ByteSize inline_type_field_klasses_offset() { return in_ByteSize(offset_of(InstanceKlass, _inline_type_field_klasses)); }
946 static ByteSize adr_inlineklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_inlineklass_fixed_block)); }
947
948 // subclass/subinterface checks
949 bool implements_interface(Klass* k) const;
950 bool is_same_or_direct_interface(Klass* k) const;
951
952 #ifdef ASSERT
953 // check whether this class or one of its superclasses was redefined
954 bool has_redefined_this_or_super() const;
955 #endif
956
957 // Access to the implementor of an interface.
958 InstanceKlass* implementor() const;
959 void set_implementor(InstanceKlass* ik);
960 int nof_implementors() const;
961 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
962 void init_implementor(); // initialize
963
964 // link this class into the implementors list of every interface it implements
965 void process_interfaces();
966
967 // virtual operations from Klass
968 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
969 Array<InstanceKlass*>* transitive_interfaces);
970 bool can_be_primary_super_slow() const;
971 size_t oop_size(oop obj) const { return size_helper(); }
972 // slow because it's a virtual call and used for verifying the layout_helper.
973 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
974 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
975
976 // Iterators
977 void do_local_static_fields(FieldClosure* cl);
978 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
979 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
980 void print_nonstatic_fields(FieldClosure* cl); // including inherited and injected fields
981
982 void methods_do(void f(Method* method));
983
984 static InstanceKlass* cast(Klass* k) {
985 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
986 }
987
988 static const InstanceKlass* cast(const Klass* k) {
989 assert(k != NULL, "k should not be null");
990 assert(k->is_instance_klass(), "cast to InstanceKlass");
991 return static_cast<const InstanceKlass*>(k);
992 }
993
994 virtual InstanceKlass* java_super() const {
995 return (super() == NULL) ? NULL : cast(super());
996 }
997
998 // Sizing (in words)
999 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1000
1001 static int size(int vtable_length, int itable_length,
1002 int nonstatic_oop_map_size,
1003 bool is_interface,
1004 int java_fields, bool is_inline_type) {
1005 return align_metadata_size(header_size() +
1006 vtable_length +
1007 itable_length +
1008 nonstatic_oop_map_size +
1009 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1010 (java_fields * (int)sizeof(Klass*)/wordSize) +
1011 (is_inline_type ? (int)sizeof(InlineKlassFixedBlock) : 0));
1012 }
1013
1014 int size() const { return size(vtable_length(),
1015 itable_length(),
1016 nonstatic_oop_map_size(),
1017 is_interface(),
1018 has_inline_type_fields() ? java_fields_count() : 0,
1019 is_inline_klass());
1020 }
1021
1022
1023 inline intptr_t* start_of_itable() const;
1024 inline intptr_t* end_of_itable() const;
1025 inline int itable_offset_in_words() const;
1026 inline oop static_field_base_raw();
1027 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1028
1029 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
1030 inline Klass** end_of_nonstatic_oop_maps() const;
1031
1032 inline InstanceKlass* volatile* adr_implementor() const;
1033
1034 inline address adr_inline_type_field_klasses() const;
1035 inline Klass* get_inline_type_field_klass(int idx) const;
1036 inline Klass* get_inline_type_field_klass_or_null(int idx) const;
1037 inline void set_inline_type_field_klass(int idx, Klass* k);
1038 inline void reset_inline_type_field_klass(int idx);
1039
1040 // Use this to return the size of an instance in heap words:
1041 virtual int size_helper() const {
1042 return layout_helper_to_size_helper(layout_helper());
1043 }
1044
1045 // This bit is initialized in classFileParser.cpp.
1046 // It is false under any of the following conditions:
1047 // - the class is abstract (including any interface)
1048 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1049 // - the class size is larger than FastAllocateSizeLimit
1050 // - the class is java/lang/Class, which cannot be allocated directly
1051 bool can_be_fastpath_allocated() const {
1052 return !layout_helper_needs_slow_path(layout_helper());
1053 }
1054
1055 // Java itable
1056 klassItable itable() const; // return klassItable wrapper
1057 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
1058 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
1059 int vtable_index_of_interface_method(Method* method);
1060
1061 #if INCLUDE_JVMTI
1062 void adjust_default_methods(bool* trace_name_printed);
1063 #endif // INCLUDE_JVMTI
1064
1065 void clean_weak_instanceklass_links();
1066 private:
1067 void clean_implementors_list();
1068 void clean_method_data();
1069
1070 public:
1071 // Explicit metaspace deallocation of fields
1072 // For RedefineClasses and class file parsing errors, we need to deallocate
1073 // instanceKlasses and the metadata they point to.
1074 void deallocate_contents(ClassLoaderData* loader_data);
1075 static void deallocate_methods(ClassLoaderData* loader_data,
1076 Array<Method*>* methods);
1077 void static deallocate_interfaces(ClassLoaderData* loader_data,
1078 const Klass* super_klass,
1079 Array<InstanceKlass*>* local_interfaces,
1080 Array<InstanceKlass*>* transitive_interfaces);
1081 void static deallocate_record_components(ClassLoaderData* loader_data,
1082 Array<RecordComponent*>* record_component);
1083
1084 // The constant pool is on stack if any of the methods are executing or
1085 // referenced by handles.
1086 bool on_stack() const { return _constants->on_stack(); }
1087
1088 // callbacks for actions during class unloading
1089 static void unload_class(InstanceKlass* ik);
1090
1091 virtual void release_C_heap_structures(bool release_constant_pool = true);
1092
1093 // Naming
1094 const char* signature_name() const;
1095 const char* signature_name_of_carrier(char c) const;
1096
1097 // Oop fields (and metadata) iterators
1098 //
1099 // The InstanceKlass iterators also visits the Object's klass.
1100
1101 // Forward iteration
1102 public:
1103 // Iterate over all oop fields in the oop maps.
1104 template <typename T, class OopClosureType>
1105 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1106
1107 // Iterate over all oop fields and metadata.
1108 template <typename T, class OopClosureType>
1109 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1110
1111 // Iterate over all oop fields in one oop map.
1112 template <typename T, class OopClosureType>
1113 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1114
1115
1116 // Reverse iteration
1117 // Iterate over all oop fields and metadata.
1118 template <typename T, class OopClosureType>
1119 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1120
1121 private:
1122 // Iterate over all oop fields in the oop maps.
1123 template <typename T, class OopClosureType>
1124 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1125
1126 // Iterate over all oop fields in one oop map.
1127 template <typename T, class OopClosureType>
1128 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1129
1130
1131 // Bounded range iteration
1132 public:
1133 // Iterate over all oop fields in the oop maps.
1134 template <typename T, class OopClosureType>
1135 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1136
1137 // Iterate over all oop fields and metadata.
1138 template <typename T, class OopClosureType>
1139 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1140
1141 private:
1142 // Iterate over all oop fields in one oop map.
1143 template <typename T, class OopClosureType>
1144 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1145
1146
1147 public:
1148 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1149
1150 private:
1151 // initialization state
1152 void set_init_state(ClassState state);
1153 void set_rewritten() { _misc_status.set_rewritten(true); }
1154 void set_init_thread(Thread *thread) {
1155 assert(thread == nullptr || _init_thread == nullptr, "Only one thread is allowed to own initialization");
1156 _init_thread = thread;
1157 }
1158
1159 // The RedefineClasses() API can cause new method idnums to be needed
1160 // which will cause the caches to grow. Safety requires different
1161 // cache management logic if the caches can grow instead of just
1162 // going from NULL to non-NULL.
1163 bool idnum_can_increment() const { return has_been_redefined(); }
1164 inline jmethodID* methods_jmethod_ids_acquire() const;
1165 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1166
1167 // Lock during initialization
1168 public:
1169 // Returns the array class for the n'th dimension
1170 virtual Klass* array_klass(int n, TRAPS);
1171 virtual Klass* array_klass_or_null(int n);
1172
1173 // Returns the array class with this class as element type
1174 virtual Klass* array_klass(TRAPS);
1175 virtual Klass* array_klass_or_null();
1176
1177 static void clean_initialization_error_table();
1178
1179 Monitor* init_monitor() const { return _init_monitor; }
1180 private:
1181 void check_link_state_and_wait(JavaThread* current);
1182 bool link_class_impl (TRAPS);
1183 bool verify_code (TRAPS);
1184 void initialize_impl (TRAPS);
1185 void initialize_super_interfaces (TRAPS);
1186
1187 void add_initialization_error(JavaThread* current, Handle exception);
1188 oop get_initialization_error(JavaThread* current);
1189
1190 // find a local method (returns NULL if not found)
1191 Method* find_method_impl(const Symbol* name,
1192 const Symbol* signature,
1193 OverpassLookupMode overpass_mode,
1194 StaticLookupMode static_mode,
1195 PrivateLookupMode private_mode) const;
1196
1197 static Method* find_method_impl(const Array<Method*>* methods,
1198 const Symbol* name,
1199 const Symbol* signature,
1200 OverpassLookupMode overpass_mode,
1201 StaticLookupMode static_mode,
1202 PrivateLookupMode private_mode);
1203
1204 #if INCLUDE_JVMTI
1205 // RedefineClasses support
1206 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1207 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1208 #endif
1209 // log class name to classlist
1210 void log_to_classlist() const;
1211 public:
1212
1213 #if INCLUDE_CDS
1214 // CDS support - remove and restore oops from metadata. Oops are not shared.
1215 virtual void remove_unshareable_info();
1216 virtual void remove_java_mirror();
1217 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS);
1218 void init_shared_package_entry();
1219 bool can_be_verified_at_dumptime() const;
1220 #endif
1221
1222 jint compute_modifier_flags() const;
1223
1224 public:
1225 // JVMTI support
1226 jint jvmti_class_status() const;
1227
1228 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1229
1230 public:
1231 // Printing
1232 void print_on(outputStream* st) const;
1233 void print_value_on(outputStream* st) const;
1234
1235 void oop_print_value_on(oop obj, outputStream* st);
1236
1237 void oop_print_on (oop obj, outputStream* st);
1238
1239 #ifndef PRODUCT
1240 void print_dependent_nmethods(bool verbose = false);
1241 bool is_dependent_nmethod(nmethod* nm);
1242 bool verify_itable_index(int index);
1243 #endif
1244
1245 const char* internal_name() const;
1246
1247 // Verification
1248 void verify_on(outputStream* st);
1249
1250 void oop_verify_on(oop obj, outputStream* st);
1251
1252 // Logging
1253 void print_class_load_logging(ClassLoaderData* loader_data,
1254 const ModuleEntry* module_entry,
1255 const ClassFileStream* cfs) const;
1256 };
1257
1258 // for adding methods
1259 // UNSET_IDNUM return means no more ids available
1260 inline u2 InstanceKlass::next_method_idnum() {
1261 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1262 return ConstMethod::UNSET_IDNUM; // no more ids available
1263 } else {
1264 return _idnum_allocated_count++;
1265 }
1266 }
1267
1268 class PrintClassClosure : public KlassClosure {
1269 private:
1270 outputStream* _st;
1271 bool _verbose;
1272 public:
1273 PrintClassClosure(outputStream* st, bool verbose);
1274
1275 void do_klass(Klass* k);
1276 };
1277
1278 /* JNIid class for jfieldIDs only */
1279 class JNIid: public CHeapObj<mtClass> {
1280 friend class VMStructs;
1281 private:
1282 Klass* _holder;
1283 JNIid* _next;
1284 int _offset;
1285 #ifdef ASSERT
1286 bool _is_static_field_id;
1287 #endif
1288
1289 public:
1290 // Accessors
1291 Klass* holder() const { return _holder; }
1292 int offset() const { return _offset; }
1293 JNIid* next() { return _next; }
1294 // Constructor
1295 JNIid(Klass* holder, int offset, JNIid* next);
1296 // Identifier lookup
1297 JNIid* find(int offset);
1298
1299 bool find_local_field(fieldDescriptor* fd) {
1300 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1301 }
1302
1303 static void deallocate(JNIid* id);
1304 // Debugging
1305 #ifdef ASSERT
1306 bool is_static_field_id() const { return _is_static_field_id; }
1307 void set_is_static_field_id() { _is_static_field_id = true; }
1308 #endif
1309 void verify(Klass* holder);
1310 };
1311
1312 // An iterator that's used to access the inner classes indices in the
1313 // InstanceKlass::_inner_classes array.
1314 class InnerClassesIterator : public StackObj {
1315 private:
1316 Array<jushort>* _inner_classes;
1317 int _length;
1318 int _idx;
1319 public:
1320
1321 InnerClassesIterator(const InstanceKlass* k) {
1322 _inner_classes = k->inner_classes();
1323 if (k->inner_classes() != NULL) {
1324 _length = _inner_classes->length();
1325 // The inner class array's length should be the multiple of
1326 // inner_class_next_offset if it only contains the InnerClasses
1327 // attribute data, or it should be
1328 // n*inner_class_next_offset+enclosing_method_attribute_size
1329 // if it also contains the EnclosingMethod data.
1330 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1331 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1332 "just checking");
1333 // Remove the enclosing_method portion if exists.
1334 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1335 _length -= InstanceKlass::enclosing_method_attribute_size;
1336 }
1337 } else {
1338 _length = 0;
1339 }
1340 _idx = 0;
1341 }
1342
1343 int length() const {
1344 return _length;
1345 }
1346
1347 void next() {
1348 _idx += InstanceKlass::inner_class_next_offset;
1349 }
1350
1351 bool done() const {
1352 return (_idx >= _length);
1353 }
1354
1355 u2 inner_class_info_index() const {
1356 return _inner_classes->at(
1357 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1358 }
1359
1360 void set_inner_class_info_index(u2 index) {
1361 _inner_classes->at_put(
1362 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1363 }
1364
1365 u2 outer_class_info_index() const {
1366 return _inner_classes->at(
1367 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1368 }
1369
1370 void set_outer_class_info_index(u2 index) {
1371 _inner_classes->at_put(
1372 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1373 }
1374
1375 u2 inner_name_index() const {
1376 return _inner_classes->at(
1377 _idx + InstanceKlass::inner_class_inner_name_offset);
1378 }
1379
1380 void set_inner_name_index(u2 index) {
1381 _inner_classes->at_put(
1382 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1383 }
1384
1385 u2 inner_access_flags() const {
1386 return _inner_classes->at(
1387 _idx + InstanceKlass::inner_class_access_flags_offset);
1388 }
1389 };
1390
1391 // Iterator over class hierarchy under a particular class. Implements depth-first pre-order traversal.
1392 // Usage:
1393 // for (ClassHierarchyIterator iter(root_klass); !iter.done(); iter.next()) {
1394 // Klass* k = iter.klass();
1395 // ...
1396 // }
1397 class ClassHierarchyIterator : public StackObj {
1398 private:
1399 InstanceKlass* _root;
1400 Klass* _current;
1401 bool _visit_subclasses;
1402
1403 public:
1404 ClassHierarchyIterator(InstanceKlass* root) : _root(root), _current(root), _visit_subclasses(true) {
1405 assert(_root == _current, "required"); // initial state
1406 }
1407
1408 bool done() {
1409 return (_current == NULL);
1410 }
1411
1412 // Make a step iterating over the class hierarchy under the root class.
1413 // Skips subclasses if requested.
1414 void next();
1415
1416 Klass* klass() {
1417 assert(!done(), "sanity");
1418 return _current;
1419 }
1420
1421 // Skip subclasses of the current class.
1422 void skip_subclasses() {
1423 _visit_subclasses = false;
1424 }
1425 };
1426
1427 #endif // SHARE_OOPS_INSTANCEKLASS_HPP