1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/packageEntry.hpp"
32 #include "memory/referenceType.hpp"
33 #include "oops/annotations.hpp"
34 #include "oops/constMethod.hpp"
35 #include "oops/fieldInfo.hpp"
36 #include "oops/instanceOop.hpp"
37 #include "oops/klassVtable.hpp"
38 #include "runtime/handles.hpp"
39 #include "runtime/os.hpp"
40 #include "utilities/accessFlags.hpp"
41 #include "utilities/align.hpp"
42 #include "utilities/macros.hpp"
43 #if INCLUDE_JFR
44 #include "utilities/ticks.hpp"
45 #include "jfr/support/jfrKlassExtension.hpp"
46 #endif
47
48
49 // An InstanceKlass is the VM level representation of a Java class.
50 // It contains all information needed for at class at execution runtime.
51
52 // InstanceKlass embedded field layout (after declared fields):
53 // [EMBEDDED Java vtable ] size in words = vtable_len
54 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
55 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
56 // indicating where oops are located in instances of this klass.
57 // [EMBEDDED implementor of the interface] only exist for interface
58 // [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
59 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
60
61
62 // forward declaration for class -- see below for definition
63 #if INCLUDE_JVMTI
64 class BreakpointInfo;
65 #endif
66 class ClassFileParser;
67 class KlassDepChange;
68 class DependencyContext;
69 class fieldDescriptor;
70 class jniIdMapBase;
71 class JNIid;
72 class JvmtiCachedClassFieldMap;
73 class SuperTypeClosure;
74
75 // This is used in iterators below.
76 class FieldClosure: public StackObj {
77 public:
78 virtual void do_field(fieldDescriptor* fd) = 0;
79 };
80
81 #ifndef PRODUCT
82 // Print fields.
83 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
84 class FieldPrinter: public FieldClosure {
85 oop _obj;
86 outputStream* _st;
87 public:
88 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
89 void do_field(fieldDescriptor* fd);
90 };
91 #endif // !PRODUCT
92
93 // Describes where oops are located in instances of this klass.
94 class OopMapBlock {
95 public:
96 // Byte offset of the first oop mapped by this block.
97 int offset() const { return _offset; }
98 void set_offset(int offset) { _offset = offset; }
99
100 // Number of oops in this block.
101 uint count() const { return _count; }
102 void set_count(uint count) { _count = count; }
103
104 // sizeof(OopMapBlock) in words.
105 static const int size_in_words() {
106 return align_up((int)sizeof(OopMapBlock), wordSize) >>
107 LogBytesPerWord;
108 }
109
110 private:
111 int _offset;
112 uint _count;
113 };
114
115 struct JvmtiCachedClassFileData;
116
117 class InstanceKlass: public Klass {
118 friend class VMStructs;
119 friend class JVMCIVMStructs;
120 friend class ClassFileParser;
121 friend class CompileReplay;
122
123 public:
124 static const KlassID ID = InstanceKlassID;
125
126 protected:
127 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
128
129 public:
130 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
131
132 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
133 // of the class loading & initialization procedure, and the use of the states.
134 enum ClassState {
135 allocated, // allocated (but not yet linked)
136 loaded, // loaded and inserted in class hierarchy (but not linked yet)
137 linked, // successfully linked/verified (but not initialized yet)
138 being_initialized, // currently running class initializer
139 fully_initialized, // initialized (successfull final state)
140 initialization_error // error happened during initialization
141 };
142
143 private:
144 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
145
146 #if INCLUDE_JFR
147 // JFR Class unloading timestamp
148 static Ticks _class_unload_time;
149 #endif
150
151 protected:
152 // If you add a new field that points to any metaspace object, you
153 // must add this field to InstanceKlass::metaspace_pointers_do().
154
155 // Annotations for this class
156 Annotations* _annotations;
157 // Package this class is defined in
158 PackageEntry* _package_entry;
159 // Array classes holding elements of this class.
160 Klass* volatile _array_klasses;
161 // Constant pool for this class.
162 ConstantPool* _constants;
163 // The InnerClasses attribute and EnclosingMethod attribute. The
164 // _inner_classes is an array of shorts. If the class has InnerClasses
165 // attribute, then the _inner_classes array begins with 4-tuples of shorts
166 // [inner_class_info_index, outer_class_info_index,
167 // inner_name_index, inner_class_access_flags] for the InnerClasses
168 // attribute. If the EnclosingMethod attribute exists, it occupies the
169 // last two shorts [class_index, method_index] of the array. If only
170 // the InnerClasses attribute exists, the _inner_classes array length is
171 // number_of_inner_classes * 4. If the class has both InnerClasses
172 // and EnclosingMethod attributes the _inner_classes array length is
173 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
174 Array<jushort>* _inner_classes;
175
176 // The NestMembers attribute. An array of shorts, where each is a
177 // class info index for the class that is a nest member. This data
178 // has not been validated.
179 Array<jushort>* _nest_members;
180
181 // The NestHost attribute. The class info index for the class
182 // that is the nest-host of this class. This data has not been validated.
183 jushort _nest_host_index;
184
185 // Resolved nest-host klass: either true nest-host or self if we are not nested.
186 // By always being set it makes nest-member access checks simpler.
187 InstanceKlass* _nest_host;
188
189 // the source debug extension for this klass, NULL if not specified.
190 // Specified as UTF-8 string without terminating zero byte in the classfile,
191 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
192 const char* _source_debug_extension;
193 // Array name derived from this class which needs unreferencing
194 // if this class is unloaded.
195 Symbol* _array_name;
196
197 // Number of heapOopSize words used by non-static fields in this klass
198 // (including inherited fields but after header_size()).
199 int _nonstatic_field_size;
200 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
201 // Constant pool index to the utf8 entry of the Generic signature,
202 // or 0 if none.
203 u2 _generic_signature_index;
204 // Constant pool index to the utf8 entry for the name of source file
205 // containing this klass, 0 if not specified.
206 u2 _source_file_name_index;
207 u2 _static_oop_field_count;// number of static oop fields in this klass
208 u2 _java_fields_count; // The number of declared Java fields
209 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
210
211 int _itable_len; // length of Java itable (in words)
212 // _is_marked_dependent can be set concurrently, thus cannot be part of the
213 // _misc_flags.
214 bool _is_marked_dependent; // used for marking during flushing and deoptimization
215 bool _is_being_redefined; // used for locking redefinition
216
217 // The low two bits of _misc_flags contains the kind field.
218 // This can be used to quickly discriminate among the four kinds of
219 // InstanceKlass.
220
221 static const unsigned _misc_kind_field_size = 2;
222 static const unsigned _misc_kind_field_pos = 0;
223 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
224
225 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
226 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
227 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
228 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
229
230 // Start after _misc_kind field.
231 enum {
232 _misc_rewritten = 1 << 2, // methods rewritten.
233 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
234 _misc_should_verify_class = 1 << 4, // allow caching of preverification
235 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field
236 _misc_is_contended = 1 << 6, // marked with contended annotation
237 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
238 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
239 _misc_has_been_redefined = 1 << 9, // class has been redefined
240 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
241 // code source was found to be matching the value recorded by AOT.
242 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
243 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
244 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
245 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
246 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
247 };
248 u2 loader_type_bits() {
249 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
250 }
251 u2 _misc_flags;
252 u2 _minor_version; // minor version number of class file
253 u2 _major_version; // major version number of class file
254 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
255 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
256 JNIid* _jni_ids; // First JNI identifier for static fields in this class
257 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
258 intptr_t _dep_context; // packed DependencyContext structure
259 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
260 #if INCLUDE_JVMTI
261 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
262 // Linked instanceKlasses of previous versions
263 InstanceKlass* _previous_versions;
264 // JVMTI fields can be moved to their own structure - see 6315920
265 // JVMTI: cached class file, before retransformable agent modified it in CFLH
266 JvmtiCachedClassFileData* _cached_class_file;
267 #endif
268
269 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
270
271 // Class states are defined as ClassState (see above).
272 // Place the _init_state here to utilize the unused 2-byte after
273 // _idnum_allocated_count.
274 u1 _init_state; // state of class
275 u1 _reference_type; // reference type
276
277 u2 _this_class_index; // constant pool entry
278 #if INCLUDE_JVMTI
279 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
280 #endif
281
282 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
283
284 // Method array.
285 Array<Method*>* _methods;
286 // Default Method Array, concrete methods inherited from interfaces
287 Array<Method*>* _default_methods;
288 // Interfaces (InstanceKlass*s) this class declares locally to implement.
289 Array<InstanceKlass*>* _local_interfaces;
290 // Interfaces (InstanceKlass*s) this class implements transitively.
291 Array<InstanceKlass*>* _transitive_interfaces;
292 // Int array containing the original order of method in the class file (for JVMTI).
293 Array<int>* _method_ordering;
294 // Int array containing the vtable_indices for default_methods
295 // offset matches _default_methods offset
296 Array<int>* _default_vtable_indices;
297
298 // Instance and static variable information, starts with 6-tuples of shorts
299 // [access, name index, sig index, initval index, low_offset, high_offset]
300 // for all fields, followed by the generic signature data at the end of
301 // the array. Only fields with generic signature attributes have the generic
302 // signature data set in the array. The fields array looks like following:
303 //
304 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
305 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
306 // ...
307 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
308 // [generic signature index]
309 // [generic signature index]
310 // ...
311 Array<u2>* _fields;
312
313 // embedded Java vtable follows here
314 // embedded Java itables follows here
315 // embedded static fields follows here
316 // embedded nonstatic oop-map blocks follows here
317 // embedded implementor of this interface follows here
318 // The embedded implementor only exists if the current klass is an
319 // iterface. The possible values of the implementor fall into following
320 // three cases:
321 // NULL: no implementor.
322 // A Klass* that's not itself: one implementor.
323 // Itself: more than one implementors.
324 // embedded unsafe_anonymous_host klass follows here
325 // The embedded host klass only exists in an unsafe anonymous class for
326 // dynamic language support (JSR 292 enabled). The host class grants
327 // its access privileges to this class also. The host class is either
328 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
329 // or an anonymous class loaded through normal classloading does not
330 // have this embedded field.
331 //
332
333 friend class SystemDictionary;
334
335 public:
336 u2 loader_type() {
337 return _misc_flags & loader_type_bits();
338 }
339
340 bool is_shared_boot_class() const {
341 return (_misc_flags & _misc_is_shared_boot_class) != 0;
342 }
343 bool is_shared_platform_class() const {
344 return (_misc_flags & _misc_is_shared_platform_class) != 0;
345 }
346 bool is_shared_app_class() const {
347 return (_misc_flags & _misc_is_shared_app_class) != 0;
348 }
349
350 void clear_class_loader_type() {
351 _misc_flags &= ~loader_type_bits();
352 }
353
354 void set_class_loader_type(s2 loader_type) {
355 switch (loader_type) {
356 case ClassLoader::BOOT_LOADER:
357 _misc_flags |= _misc_is_shared_boot_class;
358 break;
359 case ClassLoader::PLATFORM_LOADER:
360 _misc_flags |= _misc_is_shared_platform_class;
361 break;
362 case ClassLoader::APP_LOADER:
363 _misc_flags |= _misc_is_shared_app_class;
364 break;
365 default:
366 ShouldNotReachHere();
367 break;
368 }
369 }
370
371 bool has_nonstatic_fields() const {
372 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
373 }
374 void set_has_nonstatic_fields(bool b) {
375 if (b) {
376 _misc_flags |= _misc_has_nonstatic_fields;
377 } else {
378 _misc_flags &= ~_misc_has_nonstatic_fields;
379 }
380 }
381
382 // field sizes
383 int nonstatic_field_size() const { return _nonstatic_field_size; }
384 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
385
386 int static_field_size() const { return _static_field_size; }
387 void set_static_field_size(int size) { _static_field_size = size; }
388
389 int static_oop_field_count() const { return (int)_static_oop_field_count; }
390 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
391
392 // Java itable
393 int itable_length() const { return _itable_len; }
394 void set_itable_length(int len) { _itable_len = len; }
395
396 // array klasses
397 Klass* array_klasses() const { return _array_klasses; }
398 inline Klass* array_klasses_acquire() const; // load with acquire semantics
399 void set_array_klasses(Klass* k) { _array_klasses = k; }
400 inline void release_set_array_klasses(Klass* k); // store with release semantics
401
402 // methods
403 Array<Method*>* methods() const { return _methods; }
404 void set_methods(Array<Method*>* a) { _methods = a; }
405 Method* method_with_idnum(int idnum);
406 Method* method_with_orig_idnum(int idnum);
407 Method* method_with_orig_idnum(int idnum, int version);
408
409 // method ordering
410 Array<int>* method_ordering() const { return _method_ordering; }
411 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
412 void copy_method_ordering(const intArray* m, TRAPS);
413
414 // default_methods
415 Array<Method*>* default_methods() const { return _default_methods; }
416 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
417
418 // default method vtable_indices
419 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
420 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
421 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
422
423 // interfaces
424 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
425 void set_local_interfaces(Array<InstanceKlass*>* a) {
426 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
427 _local_interfaces = a; }
428
429 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
430 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
431 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
432 _transitive_interfaces = a;
433 }
434
435 #if INCLUDE_JFR
436 static void set_class_unload_time(Ticks ticks) { _class_unload_time = ticks; }
437 static Ticks class_unload_time() { return _class_unload_time; }
438 #endif
439
440 private:
441 friend class fieldDescriptor;
442 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
443
444 public:
445 int field_offset (int index) const { return field(index)->offset(); }
446 int field_access_flags(int index) const { return field(index)->access_flags(); }
447 Symbol* field_name (int index) const { return field(index)->name(constants()); }
448 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
449
450 // Number of Java declared fields
451 int java_fields_count() const { return (int)_java_fields_count; }
452
453 Array<u2>* fields() const { return _fields; }
454 void set_fields(Array<u2>* f, u2 java_fields_count) {
455 guarantee(_fields == NULL || f == NULL, "Just checking");
456 _fields = f;
457 _java_fields_count = java_fields_count;
458 }
459
460 // inner classes
461 Array<u2>* inner_classes() const { return _inner_classes; }
462 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
463
464 // nest members
465 Array<u2>* nest_members() const { return _nest_members; }
466 void set_nest_members(Array<u2>* m) { _nest_members = m; }
467
468 // nest-host index
469 jushort nest_host_index() const { return _nest_host_index; }
470 void set_nest_host_index(u2 i) { _nest_host_index = i; }
471
472 private:
473 // Called to verify that k is a member of this nest - does not look at k's nest-host
474 bool has_nest_member(InstanceKlass* k, TRAPS) const;
475 public:
476 // Returns nest-host class, resolving and validating it if needed
477 // Returns NULL if an exception occurs during loading, or validation fails
478 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
479 // Check if this klass is a nestmate of k - resolves this nest-host and k's
480 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
481
482 enum InnerClassAttributeOffset {
483 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
484 inner_class_inner_class_info_offset = 0,
485 inner_class_outer_class_info_offset = 1,
486 inner_class_inner_name_offset = 2,
487 inner_class_access_flags_offset = 3,
488 inner_class_next_offset = 4
489 };
490
491 enum EnclosingMethodAttributeOffset {
492 enclosing_method_class_index_offset = 0,
493 enclosing_method_method_index_offset = 1,
494 enclosing_method_attribute_size = 2
495 };
496
497 // method override check
498 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
499
500 // package
501 PackageEntry* package() const { return _package_entry; }
502 ModuleEntry* module() const;
503 bool in_unnamed_package() const { return (_package_entry == NULL); }
504 void set_package(PackageEntry* p) { _package_entry = p; }
505 void set_package(ClassLoaderData* loader_data, TRAPS);
506 bool is_same_class_package(const Klass* class2) const;
507 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
508
509 // find an enclosing class
510 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
511
512 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
513 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
514
515 private:
516 // Check prohibited package ("java/" only loadable by boot or platform loaders)
517 static void check_prohibited_package(Symbol* class_name,
518 ClassLoaderData* loader_data,
519 TRAPS);
520 public:
521 // tell if two classes have the same enclosing class (at package level)
522 bool is_same_package_member(const Klass* class2, TRAPS) const;
523
524 // initialization state
525 bool is_loaded() const { return _init_state >= loaded; }
526 bool is_linked() const { return _init_state >= linked; }
527 bool is_initialized() const { return _init_state == fully_initialized; }
528 bool is_not_initialized() const { return _init_state < being_initialized; }
529 bool is_being_initialized() const { return _init_state == being_initialized; }
530 bool is_in_error_state() const { return _init_state == initialization_error; }
531 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
532 ClassState init_state() { return (ClassState)_init_state; }
533 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
534
535 // defineClass specified verification
536 bool should_verify_class() const {
537 return (_misc_flags & _misc_should_verify_class) != 0;
538 }
539 void set_should_verify_class(bool value) {
540 if (value) {
541 _misc_flags |= _misc_should_verify_class;
542 } else {
543 _misc_flags &= ~_misc_should_verify_class;
544 }
545 }
546
547 // marking
548 bool is_marked_dependent() const { return _is_marked_dependent; }
549 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
550
551 // initialization (virtuals from Klass)
552 bool should_be_initialized() const; // means that initialize should be called
553 void initialize(TRAPS);
554 void link_class(TRAPS);
555 bool link_class_or_fail(TRAPS); // returns false on failure
556 void unlink_class();
557 void rewrite_class(TRAPS);
558 void link_methods(TRAPS);
559 Method* class_initializer() const;
560
561 // set the class to initialized if no static initializer is present
562 void eager_initialize(Thread *thread);
563
564 // reference type
565 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
566 void set_reference_type(ReferenceType t) {
567 assert(t == (u1)t, "overflow");
568 _reference_type = (u1)t;
569 }
570
571 // this class cp index
572 u2 this_class_index() const { return _this_class_index; }
573 void set_this_class_index(u2 index) { _this_class_index = index; }
574
575 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
576
577 // find local field, returns true if found
578 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
579 // find field in direct superinterfaces, returns the interface in which the field is defined
580 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
581 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
582 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
583 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
584 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
585
586 // find a non-static or static field given its offset within the class.
587 bool contains_field_offset(int offset) {
588 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
589 }
590
591 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
592 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
593
594 // find a local method (returns NULL if not found)
595 Method* find_method(const Symbol* name, const Symbol* signature) const;
596 static Method* find_method(const Array<Method*>* methods,
597 const Symbol* name,
598 const Symbol* signature);
599
600 // find a local method, but skip static methods
601 Method* find_instance_method(const Symbol* name, const Symbol* signature,
602 PrivateLookupMode private_mode = find_private) const;
603 static Method* find_instance_method(const Array<Method*>* methods,
604 const Symbol* name,
605 const Symbol* signature,
606 PrivateLookupMode private_mode = find_private);
607
608 // find a local method (returns NULL if not found)
609 Method* find_local_method(const Symbol* name,
610 const Symbol* signature,
611 OverpassLookupMode overpass_mode,
612 StaticLookupMode static_mode,
613 PrivateLookupMode private_mode) const;
614
615 // find a local method from given methods array (returns NULL if not found)
616 static Method* find_local_method(const Array<Method*>* methods,
617 const Symbol* name,
618 const Symbol* signature,
619 OverpassLookupMode overpass_mode,
620 StaticLookupMode static_mode,
621 PrivateLookupMode private_mode);
622
623 // find a local method index in methods or default_methods (returns -1 if not found)
624 static int find_method_index(const Array<Method*>* methods,
625 const Symbol* name,
626 const Symbol* signature,
627 OverpassLookupMode overpass_mode,
628 StaticLookupMode static_mode,
629 PrivateLookupMode private_mode);
630
631 // lookup operation (returns NULL if not found)
632 Method* uncached_lookup_method(const Symbol* name,
633 const Symbol* signature,
634 OverpassLookupMode overpass_mode,
635 PrivateLookupMode private_mode = find_private) const;
636
637 // lookup a method in all the interfaces that this class implements
638 // (returns NULL if not found)
639 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
640
641 // lookup a method in local defaults then in all interfaces
642 // (returns NULL if not found)
643 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
644
645 // Find method indices by name. If a method with the specified name is
646 // found the index to the first method is returned, and 'end' is filled in
647 // with the index of first non-name-matching method. If no method is found
648 // -1 is returned.
649 int find_method_by_name(const Symbol* name, int* end) const;
650 static int find_method_by_name(const Array<Method*>* methods,
651 const Symbol* name, int* end);
652
653 // constant pool
654 ConstantPool* constants() const { return _constants; }
655 void set_constants(ConstantPool* c) { _constants = c; }
656
657 // protection domain
658 oop protection_domain() const;
659
660 // signers
661 objArrayOop signers() const;
662
663 // host class
664 InstanceKlass* unsafe_anonymous_host() const {
665 InstanceKlass** hk = adr_unsafe_anonymous_host();
666 if (hk == NULL) {
667 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
668 return NULL;
669 } else {
670 assert(*hk != NULL, "host klass should always be set if the address is not null");
671 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
672 return *hk;
673 }
674 }
675 void set_unsafe_anonymous_host(const InstanceKlass* host) {
676 assert(is_unsafe_anonymous(), "not unsafe anonymous");
677 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
678 assert(addr != NULL, "no reversed space");
679 if (addr != NULL) {
680 *addr = host;
681 }
682 }
683 bool is_unsafe_anonymous() const {
684 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
685 }
686 void set_is_unsafe_anonymous(bool value) {
687 if (value) {
688 _misc_flags |= _misc_is_unsafe_anonymous;
689 } else {
690 _misc_flags &= ~_misc_is_unsafe_anonymous;
691 }
692 }
693
694 // Oop that keeps the metadata for this class from being unloaded
695 // in places where the metadata is stored in other places, like nmethods
696 oop klass_holder() const {
697 return (is_unsafe_anonymous()) ? java_mirror() : class_loader();
698 }
699
700 bool is_contended() const {
701 return (_misc_flags & _misc_is_contended) != 0;
702 }
703 void set_is_contended(bool value) {
704 if (value) {
705 _misc_flags |= _misc_is_contended;
706 } else {
707 _misc_flags &= ~_misc_is_contended;
708 }
709 }
710
711 // source file name
712 Symbol* source_file_name() const {
713 return (_source_file_name_index == 0) ?
714 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
715 }
716 u2 source_file_name_index() const {
717 return _source_file_name_index;
718 }
719 void set_source_file_name_index(u2 sourcefile_index) {
720 _source_file_name_index = sourcefile_index;
721 }
722
723 // minor and major version numbers of class file
724 u2 minor_version() const { return _minor_version; }
725 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
726 u2 major_version() const { return _major_version; }
727 void set_major_version(u2 major_version) { _major_version = major_version; }
728
729 // source debug extension
730 const char* source_debug_extension() const { return _source_debug_extension; }
731 void set_source_debug_extension(const char* array, int length);
732
733 // symbol unloading support (refcount already added)
734 Symbol* array_name() { return _array_name; }
735 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
736
737 // nonstatic oop-map blocks
738 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
739 return oop_map_count * OopMapBlock::size_in_words();
740 }
741 unsigned int nonstatic_oop_map_count() const {
742 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
743 }
744 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
745 void set_nonstatic_oop_map_size(int words) {
746 _nonstatic_oop_map_size = words;
747 }
748
749 #if INCLUDE_JVMTI
750 // Redefinition locking. Class can only be redefined by one thread at a time.
751 bool is_being_redefined() const { return _is_being_redefined; }
752 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
753
754 // RedefineClasses() support for previous versions:
755 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
756 void purge_previous_version_list();
757
758 InstanceKlass* previous_versions() const { return _previous_versions; }
759 #else
760 InstanceKlass* previous_versions() const { return NULL; }
761 #endif
762
763 InstanceKlass* get_klass_version(int version) {
764 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
765 if (ik->constants()->version() == version) {
766 return ik;
767 }
768 }
769 return NULL;
770 }
771
772 bool has_been_redefined() const {
773 return (_misc_flags & _misc_has_been_redefined) != 0;
774 }
775 void set_has_been_redefined() {
776 _misc_flags |= _misc_has_been_redefined;
777 }
778
779 bool has_passed_fingerprint_check() const {
780 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
781 }
782 void set_has_passed_fingerprint_check(bool b) {
783 if (b) {
784 _misc_flags |= _misc_has_passed_fingerprint_check;
785 } else {
786 _misc_flags &= ~_misc_has_passed_fingerprint_check;
787 }
788 }
789 bool supers_have_passed_fingerprint_checks();
790
791 static bool should_store_fingerprint(bool is_unsafe_anonymous);
792 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
793 bool has_stored_fingerprint() const;
794 uint64_t get_stored_fingerprint() const;
795 void store_fingerprint(uint64_t fingerprint);
796
797 bool is_scratch_class() const {
798 return (_misc_flags & _misc_is_scratch_class) != 0;
799 }
800
801 void set_is_scratch_class() {
802 _misc_flags |= _misc_is_scratch_class;
803 }
804
805 bool has_resolved_methods() const {
806 return (_misc_flags & _misc_has_resolved_methods) != 0;
807 }
808
809 void set_has_resolved_methods() {
810 _misc_flags |= _misc_has_resolved_methods;
811 }
812 private:
813
814 void set_kind(unsigned kind) {
815 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
816 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
817 unsigned flags = _misc_flags & ~fmask;
818 _misc_flags = (flags | (kind << _misc_kind_field_pos));
819 }
820
821 bool is_kind(unsigned desired) const {
822 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
823 return kind == desired;
824 }
825
826 public:
827
828 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
829 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
830 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
831 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
832 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
833
834 #if INCLUDE_JVMTI
835
836 void init_previous_versions() {
837 _previous_versions = NULL;
838 }
839
840 private:
841 static bool _has_previous_versions;
842 public:
843 static void purge_previous_versions(InstanceKlass* ik) {
844 if (ik->has_been_redefined()) {
845 ik->purge_previous_version_list();
846 }
847 }
848
849 static bool has_previous_versions_and_reset();
850 static bool has_previous_versions() { return _has_previous_versions; }
851
852 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
853 void set_cached_class_file(JvmtiCachedClassFileData *data) {
854 _cached_class_file = data;
855 }
856 JvmtiCachedClassFileData * get_cached_class_file();
857 jint get_cached_class_file_len();
858 unsigned char * get_cached_class_file_bytes();
859
860 // JVMTI: Support for caching of field indices, types, and offsets
861 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
862 _jvmti_cached_class_field_map = descriptor;
863 }
864 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
865 return _jvmti_cached_class_field_map;
866 }
867
868 #if INCLUDE_CDS
869 void set_archived_class_data(JvmtiCachedClassFileData* data) {
870 _cached_class_file = data;
871 }
872
873 JvmtiCachedClassFileData * get_archived_class_data();
874 #endif // INCLUDE_CDS
875 #else // INCLUDE_JVMTI
876
877 static void purge_previous_versions(InstanceKlass* ik) { return; };
878 static bool has_previous_versions_and_reset() { return false; }
879
880 void set_cached_class_file(JvmtiCachedClassFileData *data) {
881 assert(data == NULL, "unexpected call with JVMTI disabled");
882 }
883 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
884
885 #endif // INCLUDE_JVMTI
886
887 bool has_nonstatic_concrete_methods() const {
888 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
889 }
890 void set_has_nonstatic_concrete_methods(bool b) {
891 if (b) {
892 _misc_flags |= _misc_has_nonstatic_concrete_methods;
893 } else {
894 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
895 }
896 }
897
898 bool declares_nonstatic_concrete_methods() const {
899 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
900 }
901 void set_declares_nonstatic_concrete_methods(bool b) {
902 if (b) {
903 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
904 } else {
905 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
906 }
907 }
908
909 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
910 inline u2 next_method_idnum();
911 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
912
913 // generics support
914 Symbol* generic_signature() const {
915 return (_generic_signature_index == 0) ?
916 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
917 }
918 u2 generic_signature_index() const {
919 return _generic_signature_index;
920 }
921 void set_generic_signature_index(u2 sig_index) {
922 _generic_signature_index = sig_index;
923 }
924
925 u2 enclosing_method_data(int offset) const;
926 u2 enclosing_method_class_index() const {
927 return enclosing_method_data(enclosing_method_class_index_offset);
928 }
929 u2 enclosing_method_method_index() {
930 return enclosing_method_data(enclosing_method_method_index_offset);
931 }
932 void set_enclosing_method_indices(u2 class_index,
933 u2 method_index);
934
935 // jmethodID support
936 jmethodID get_jmethod_id(const methodHandle& method_h);
937 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
938 jmethodID new_id, jmethodID* new_jmeths,
939 jmethodID* to_dealloc_id_p,
940 jmethodID** to_dealloc_jmeths_p);
941 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
942 size_t *length_p, jmethodID* id_p);
943 void ensure_space_for_methodids(int start_offset = 0);
944 jmethodID jmethod_id_or_null(Method* method);
945
946 // annotations support
947 Annotations* annotations() const { return _annotations; }
948 void set_annotations(Annotations* anno) { _annotations = anno; }
949
950 AnnotationArray* class_annotations() const {
951 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
952 }
953 Array<AnnotationArray*>* fields_annotations() const {
954 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
955 }
956 AnnotationArray* class_type_annotations() const {
957 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
958 }
959 Array<AnnotationArray*>* fields_type_annotations() const {
960 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
961 }
962 // allocation
963 instanceOop allocate_instance(TRAPS);
964
965 // additional member function to return a handle
966 instanceHandle allocate_instance_handle(TRAPS);
967
968 objArrayOop allocate_objArray(int n, int length, TRAPS);
969 // Helper function
970 static instanceOop register_finalizer(instanceOop i, TRAPS);
971
972 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
973 // if not, throw either an Error or an Exception.
974 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
975
976 // initialization
977 void call_class_initializer(TRAPS);
978 void set_initialization_state_and_notify(ClassState state, TRAPS);
979
980 // OopMapCache support
981 OopMapCache* oop_map_cache() { return _oop_map_cache; }
982 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
983 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
984
985 // JNI identifier support (for static fields - for jni performance)
986 JNIid* jni_ids() { return _jni_ids; }
987 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
988 JNIid* jni_id_for(int offset);
989
990 // maintenance of deoptimization dependencies
991 inline DependencyContext dependencies();
992 int mark_dependent_nmethods(KlassDepChange& changes);
993 void add_dependent_nmethod(nmethod* nm);
994 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
995
996 // On-stack replacement support
997 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
998 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
999 void add_osr_nmethod(nmethod* n);
1000 bool remove_osr_nmethod(nmethod* n);
1001 int mark_osr_nmethods(const Method* m);
1002 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1003
1004 #if INCLUDE_JVMTI
1005 // Breakpoint support (see methods on Method* for details)
1006 BreakpointInfo* breakpoints() const { return _breakpoints; };
1007 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1008 #endif
1009
1010 // support for stub routines
1011 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1012 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1013 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1014
1015 // subclass/subinterface checks
1016 bool implements_interface(Klass* k) const;
1017 bool is_same_or_direct_interface(Klass* k) const;
1018
1019 #ifdef ASSERT
1020 // check whether this class or one of its superclasses was redefined
1021 bool has_redefined_this_or_super() const;
1022 #endif
1023
1024 // Access to the implementor of an interface.
1025 Klass* implementor() const;
1026 void set_implementor(Klass* k);
1027 int nof_implementors() const;
1028 void add_implementor(Klass* k); // k is a new class that implements this interface
1029 void init_implementor(); // initialize
1030
1031 // link this class into the implementors list of every interface it implements
1032 void process_interfaces(Thread *thread);
1033
1034 // virtual operations from Klass
1035 bool is_leaf_class() const { return _subklass == NULL; }
1036 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1037 Array<InstanceKlass*>* transitive_interfaces);
1038 bool compute_is_subtype_of(Klass* k);
1039 bool can_be_primary_super_slow() const;
1040 int oop_size(oop obj) const { return size_helper(); }
1041 // slow because it's a virtual call and used for verifying the layout_helper.
1042 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1043 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1044
1045 // Iterators
1046 void do_local_static_fields(FieldClosure* cl);
1047 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1048 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1049
1050 void methods_do(void f(Method* method));
1051 void array_klasses_do(void f(Klass* k));
1052 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1053 bool super_types_do(SuperTypeClosure* blk);
1054
1055 static InstanceKlass* cast(Klass* k) {
1056 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1057 }
1058
1059 static const InstanceKlass* cast(const Klass* k) {
1060 assert(k != NULL, "k should not be null");
1061 assert(k->is_instance_klass(), "cast to InstanceKlass");
1062 return static_cast<const InstanceKlass*>(k);
1063 }
1064
1065 virtual InstanceKlass* java_super() const {
1066 return (super() == NULL) ? NULL : cast(super());
1067 }
1068
1069 // Sizing (in words)
1070 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1071
1072 static int size(int vtable_length, int itable_length,
1073 int nonstatic_oop_map_size,
1074 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1075 return align_metadata_size(header_size() +
1076 vtable_length +
1077 itable_length +
1078 nonstatic_oop_map_size +
1079 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1080 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1081 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1082 }
1083 int size() const { return size(vtable_length(),
1084 itable_length(),
1085 nonstatic_oop_map_size(),
1086 is_interface(),
1087 is_unsafe_anonymous(),
1088 has_stored_fingerprint());
1089 }
1090 #if INCLUDE_SERVICES
1091 virtual void collect_statistics(KlassSizeStats *sz) const;
1092 #endif
1093
1094 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1095 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1096
1097 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1098
1099 oop static_field_base_raw() { return java_mirror(); }
1100
1101 OopMapBlock* start_of_nonstatic_oop_maps() const {
1102 return (OopMapBlock*)(start_of_itable() + itable_length());
1103 }
1104
1105 Klass** end_of_nonstatic_oop_maps() const {
1106 return (Klass**)(start_of_nonstatic_oop_maps() +
1107 nonstatic_oop_map_count());
1108 }
1109
1110 Klass** adr_implementor() const {
1111 if (is_interface()) {
1112 return (Klass**)end_of_nonstatic_oop_maps();
1113 } else {
1114 return NULL;
1115 }
1116 };
1117
1118 InstanceKlass** adr_unsafe_anonymous_host() const {
1119 if (is_unsafe_anonymous()) {
1120 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1121 if (adr_impl != NULL) {
1122 return adr_impl + 1;
1123 } else {
1124 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1125 }
1126 } else {
1127 return NULL;
1128 }
1129 }
1130
1131 address adr_fingerprint() const {
1132 if (has_stored_fingerprint()) {
1133 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1134 if (adr_host != NULL) {
1135 return (address)(adr_host + 1);
1136 }
1137
1138 Klass** adr_impl = adr_implementor();
1139 if (adr_impl != NULL) {
1140 return (address)(adr_impl + 1);
1141 }
1142
1143 return (address)end_of_nonstatic_oop_maps();
1144 } else {
1145 return NULL;
1146 }
1147 }
1148
1149 // Use this to return the size of an instance in heap words:
1150 int size_helper() const {
1151 return layout_helper_to_size_helper(layout_helper());
1152 }
1153
1154 // This bit is initialized in classFileParser.cpp.
1155 // It is false under any of the following conditions:
1156 // - the class is abstract (including any interface)
1157 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1158 // - the class size is larger than FastAllocateSizeLimit
1159 // - the class is java/lang/Class, which cannot be allocated directly
1160 bool can_be_fastpath_allocated() const {
1161 return !layout_helper_needs_slow_path(layout_helper());
1162 }
1163
1164 // Java itable
1165 klassItable itable() const; // return klassItable wrapper
1166 Method* method_at_itable(Klass* holder, int index, TRAPS);
1167
1168 #if INCLUDE_JVMTI
1169 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1170 #endif // INCLUDE_JVMTI
1171
1172 void clean_weak_instanceklass_links();
1173 private:
1174 void clean_implementors_list();
1175 void clean_method_data();
1176
1177 public:
1178 // Explicit metaspace deallocation of fields
1179 // For RedefineClasses and class file parsing errors, we need to deallocate
1180 // instanceKlasses and the metadata they point to.
1181 void deallocate_contents(ClassLoaderData* loader_data);
1182 static void deallocate_methods(ClassLoaderData* loader_data,
1183 Array<Method*>* methods);
1184 void static deallocate_interfaces(ClassLoaderData* loader_data,
1185 const Klass* super_klass,
1186 Array<InstanceKlass*>* local_interfaces,
1187 Array<InstanceKlass*>* transitive_interfaces);
1188
1189 // The constant pool is on stack if any of the methods are executing or
1190 // referenced by handles.
1191 bool on_stack() const { return _constants->on_stack(); }
1192
1193 // callbacks for actions during class unloading
1194 static void notify_unload_class(InstanceKlass* ik);
1195 static void release_C_heap_structures(InstanceKlass* ik);
1196
1197 // Naming
1198 const char* signature_name() const;
1199 static Symbol* package_from_name(const Symbol* name, TRAPS);
1200
1201 // GC specific object visitors
1202 //
1203 #if INCLUDE_PARALLELGC
1204 // Parallel Scavenge
1205 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1206 // Parallel Compact
1207 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1208 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1209 #endif
1210
1211 // Oop fields (and metadata) iterators
1212 //
1213 // The InstanceKlass iterators also visits the Object's klass.
1214
1215 // Forward iteration
1216 public:
1217 // Iterate over all oop fields in the oop maps.
1218 template <typename T, class OopClosureType>
1219 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1220
1221 // Iterate over all oop fields and metadata.
1222 template <typename T, class OopClosureType>
1223 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1224
1225 // Iterate over all oop fields in one oop map.
1226 template <typename T, class OopClosureType>
1227 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1228
1229
1230 // Reverse iteration
1231 // Iterate over all oop fields and metadata.
1232 template <typename T, class OopClosureType>
1233 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1234
1235 private:
1236 // Iterate over all oop fields in the oop maps.
1237 template <typename T, class OopClosureType>
1238 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1239
1240 // Iterate over all oop fields in one oop map.
1241 template <typename T, class OopClosureType>
1242 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1243
1244
1245 // Bounded range iteration
1246 public:
1247 // Iterate over all oop fields in the oop maps.
1248 template <typename T, class OopClosureType>
1249 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1250
1251 // Iterate over all oop fields and metadata.
1252 template <typename T, class OopClosureType>
1253 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1254
1255 private:
1256 // Iterate over all oop fields in one oop map.
1257 template <typename T, class OopClosureType>
1258 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1259
1260
1261 public:
1262 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1263
1264 public:
1265 void set_in_error_state() {
1266 assert(DumpSharedSpaces, "only call this when dumping archive");
1267 _init_state = initialization_error;
1268 }
1269 bool check_sharing_error_state();
1270
1271 private:
1272 // initialization state
1273 #ifdef ASSERT
1274 void set_init_state(ClassState state);
1275 #else
1276 void set_init_state(ClassState state) { _init_state = (u1)state; }
1277 #endif
1278 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1279 void set_init_thread(Thread *thread) { _init_thread = thread; }
1280
1281 // The RedefineClasses() API can cause new method idnums to be needed
1282 // which will cause the caches to grow. Safety requires different
1283 // cache management logic if the caches can grow instead of just
1284 // going from NULL to non-NULL.
1285 bool idnum_can_increment() const { return has_been_redefined(); }
1286 inline jmethodID* methods_jmethod_ids_acquire() const;
1287 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1288
1289 // Lock during initialization
1290 public:
1291 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1292 // Must be one per class and it has to be a VM internal object so java code
1293 // cannot lock it (like the mirror).
1294 // It has to be an object not a Mutex because it's held through java calls.
1295 oop init_lock() const;
1296 private:
1297 void fence_and_clear_init_lock();
1298
1299 bool link_class_impl (bool throw_verifyerror, TRAPS);
1300 bool verify_code (bool throw_verifyerror, TRAPS);
1301 void initialize_impl (TRAPS);
1302 void initialize_super_interfaces (TRAPS);
1303 void eager_initialize_impl ();
1304 /* jni_id_for_impl for jfieldID only */
1305 JNIid* jni_id_for_impl (int offset);
1306
1307 // Returns the array class for the n'th dimension
1308 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1309
1310 // Returns the array class with this class as element type
1311 Klass* array_klass_impl(bool or_null, TRAPS);
1312
1313 // find a local method (returns NULL if not found)
1314 Method* find_method_impl(const Symbol* name,
1315 const Symbol* signature,
1316 OverpassLookupMode overpass_mode,
1317 StaticLookupMode static_mode,
1318 PrivateLookupMode private_mode) const;
1319
1320 static Method* find_method_impl(const Array<Method*>* methods,
1321 const Symbol* name,
1322 const Symbol* signature,
1323 OverpassLookupMode overpass_mode,
1324 StaticLookupMode static_mode,
1325 PrivateLookupMode private_mode);
1326
1327 // Free CHeap allocated fields.
1328 void release_C_heap_structures();
1329
1330 #if INCLUDE_JVMTI
1331 // RedefineClasses support
1332 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1333 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1334 #endif
1335 public:
1336 // CDS support - remove and restore oops from metadata. Oops are not shared.
1337 virtual void remove_unshareable_info();
1338 virtual void remove_java_mirror();
1339 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1340
1341 // jvm support
1342 jint compute_modifier_flags(TRAPS) const;
1343
1344 public:
1345 // JVMTI support
1346 jint jvmti_class_status() const;
1347
1348 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1349
1350 public:
1351 // Printing
1352 #ifndef PRODUCT
1353 void print_on(outputStream* st) const;
1354 #endif
1355 void print_value_on(outputStream* st) const;
1356
1357 void oop_print_value_on(oop obj, outputStream* st);
1358
1359 #ifndef PRODUCT
1360 void oop_print_on (oop obj, outputStream* st);
1361
1362 void print_dependent_nmethods(bool verbose = false);
1363 bool is_dependent_nmethod(nmethod* nm);
1364 bool verify_itable_index(int index);
1365 #endif
1366
1367 const char* internal_name() const;
1368
1369 // Verification
1370 void verify_on(outputStream* st);
1371
1372 void oop_verify_on(oop obj, outputStream* st);
1373
1374 // Logging
1375 void print_class_load_logging(ClassLoaderData* loader_data,
1376 const char* module_name,
1377 const ClassFileStream* cfs) const;
1378 };
1379
1380 // for adding methods
1381 // UNSET_IDNUM return means no more ids available
1382 inline u2 InstanceKlass::next_method_idnum() {
1383 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1384 return ConstMethod::UNSET_IDNUM; // no more ids available
1385 } else {
1386 return _idnum_allocated_count++;
1387 }
1388 }
1389
1390
1391 /* JNIid class for jfieldIDs only */
1392 class JNIid: public CHeapObj<mtClass> {
1393 friend class VMStructs;
1394 private:
1395 Klass* _holder;
1396 JNIid* _next;
1397 int _offset;
1398 #ifdef ASSERT
1399 bool _is_static_field_id;
1400 #endif
1401
1402 public:
1403 // Accessors
1404 Klass* holder() const { return _holder; }
1405 int offset() const { return _offset; }
1406 JNIid* next() { return _next; }
1407 // Constructor
1408 JNIid(Klass* holder, int offset, JNIid* next);
1409 // Identifier lookup
1410 JNIid* find(int offset);
1411
1412 bool find_local_field(fieldDescriptor* fd) {
1413 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1414 }
1415
1416 static void deallocate(JNIid* id);
1417 // Debugging
1418 #ifdef ASSERT
1419 bool is_static_field_id() const { return _is_static_field_id; }
1420 void set_is_static_field_id() { _is_static_field_id = true; }
1421 #endif
1422 void verify(Klass* holder);
1423 };
1424
1425 // An iterator that's used to access the inner classes indices in the
1426 // InstanceKlass::_inner_classes array.
1427 class InnerClassesIterator : public StackObj {
1428 private:
1429 Array<jushort>* _inner_classes;
1430 int _length;
1431 int _idx;
1432 public:
1433
1434 InnerClassesIterator(const InstanceKlass* k) {
1435 _inner_classes = k->inner_classes();
1436 if (k->inner_classes() != NULL) {
1437 _length = _inner_classes->length();
1438 // The inner class array's length should be the multiple of
1439 // inner_class_next_offset if it only contains the InnerClasses
1440 // attribute data, or it should be
1441 // n*inner_class_next_offset+enclosing_method_attribute_size
1442 // if it also contains the EnclosingMethod data.
1443 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1444 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1445 "just checking");
1446 // Remove the enclosing_method portion if exists.
1447 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1448 _length -= InstanceKlass::enclosing_method_attribute_size;
1449 }
1450 } else {
1451 _length = 0;
1452 }
1453 _idx = 0;
1454 }
1455
1456 int length() const {
1457 return _length;
1458 }
1459
1460 void next() {
1461 _idx += InstanceKlass::inner_class_next_offset;
1462 }
1463
1464 bool done() const {
1465 return (_idx >= _length);
1466 }
1467
1468 u2 inner_class_info_index() const {
1469 return _inner_classes->at(
1470 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1471 }
1472
1473 void set_inner_class_info_index(u2 index) {
1474 _inner_classes->at_put(
1475 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1476 }
1477
1478 u2 outer_class_info_index() const {
1479 return _inner_classes->at(
1480 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1481 }
1482
1483 void set_outer_class_info_index(u2 index) {
1484 _inner_classes->at_put(
1485 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1486 }
1487
1488 u2 inner_name_index() const {
1489 return _inner_classes->at(
1490 _idx + InstanceKlass::inner_class_inner_name_offset);
1491 }
1492
1493 void set_inner_name_index(u2 index) {
1494 _inner_classes->at_put(
1495 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1496 }
1497
1498 u2 inner_access_flags() const {
1499 return _inner_classes->at(
1500 _idx + InstanceKlass::inner_class_access_flags_offset);
1501 }
1502 };
1503
1504 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP