1 /*
2 * Copyright (c) 1997, 2020, 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 "classfile/classLoaderData.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceOop.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/os.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/macros.hpp"
40 #if INCLUDE_JFR
41 #include "jfr/support/jfrKlassExtension.hpp"
42 #endif
43
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 unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
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 InterpreterOopMap;
74 class PackageEntry;
75 class ModuleEntry;
76
77 // This is used in iterators below.
78 class FieldClosure: public StackObj {
79 public:
80 virtual void do_field(fieldDescriptor* fd) = 0;
81 };
82
83 #ifndef PRODUCT
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 #endif // !PRODUCT
94
95 // Describes where oops are located in instances of this klass.
96 class OopMapBlock {
97 public:
98 // Byte offset of the first oop mapped by this block.
99 int offset() const { return _offset; }
100 void set_offset(int offset) { _offset = offset; }
101
102 // Number of oops in this block.
103 uint count() const { return _count; }
104 void set_count(uint count) { _count = count; }
105
106 void increment_count(int diff) { _count += diff; }
107
108 int offset_span() const { return _count * heapOopSize; }
109
110 int end_offset() const {
111 return offset() + offset_span();
112 }
113
114 bool is_contiguous(int another_offset) const {
115 return another_offset == end_offset();
116 }
117
118 // sizeof(OopMapBlock) in words.
119 static const int size_in_words() {
120 return align_up((int)sizeof(OopMapBlock), wordSize) >>
121 LogBytesPerWord;
122 }
123
124 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
125 return a->offset() - b->offset();
126 }
127
128 private:
129 int _offset;
130 uint _count;
131 };
132
133 struct JvmtiCachedClassFileData;
134
135 class InstanceKlass: public Klass {
136 friend class VMStructs;
137 friend class JVMCIVMStructs;
138 friend class ClassFileParser;
139 friend class CompileReplay;
140
141 public:
142 static const KlassID ID = InstanceKlassID;
143
144 protected:
145 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
146
147 public:
148 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
149
150 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
151 // of the class loading & initialization procedure, and the use of the states.
152 enum ClassState {
153 allocated, // allocated (but not yet linked)
154 loaded, // loaded and inserted in class hierarchy (but not linked yet)
155 linked, // successfully linked/verified (but not initialized yet)
156 being_initialized, // currently running class initializer
157 fully_initialized, // initialized (successfull final state)
158 initialization_error // error happened during initialization
159 };
160
161 private:
162 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
163
164 protected:
165 // If you add a new field that points to any metaspace object, you
166 // must add this field to InstanceKlass::metaspace_pointers_do().
167
168 // Annotations for this class
169 Annotations* _annotations;
170 // Package this class is defined in
171 PackageEntry* _package_entry;
172 // Array classes holding elements of this class.
173 ObjArrayKlass* volatile _array_klasses;
174 // Constant pool for this class.
175 ConstantPool* _constants;
176 // The InnerClasses attribute and EnclosingMethod attribute. The
177 // _inner_classes is an array of shorts. If the class has InnerClasses
178 // attribute, then the _inner_classes array begins with 4-tuples of shorts
179 // [inner_class_info_index, outer_class_info_index,
180 // inner_name_index, inner_class_access_flags] for the InnerClasses
181 // attribute. If the EnclosingMethod attribute exists, it occupies the
182 // last two shorts [class_index, method_index] of the array. If only
183 // the InnerClasses attribute exists, the _inner_classes array length is
184 // number_of_inner_classes * 4. If the class has both InnerClasses
185 // and EnclosingMethod attributes the _inner_classes array length is
186 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
187 Array<jushort>* _inner_classes;
188
189 // The NestMembers attribute. An array of shorts, where each is a
190 // class info index for the class that is a nest member. This data
191 // has not been validated.
192 Array<jushort>* _nest_members;
193
194 // Resolved nest-host klass: either true nest-host or self if we are not
195 // nested, or an error occurred resolving or validating the nominated
196 // nest-host. Can also be set directly by JDK API's that establish nest
197 // relationships.
198 // By always being set it makes nest-member access checks simpler.
199 InstanceKlass* _nest_host;
200
201 // The PermittedSubclasses attribute. An array of shorts, where each is a
202 // class info index for the class that is a permitted subclass.
203 Array<jushort>* _permitted_subclasses;
204
205 // The contents of the Record attribute.
206 Array<RecordComponent*>* _record_components;
207
208 // the source debug extension for this klass, NULL if not specified.
209 // Specified as UTF-8 string without terminating zero byte in the classfile,
210 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
211 const char* _source_debug_extension;
212
213 // Number of heapOopSize words used by non-static fields in this klass
214 // (including inherited fields but after header_size()).
215 int _nonstatic_field_size;
216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
217
218 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
219 int _itable_len; // length of Java itable (in words)
220
221 // The NestHost attribute. The class info index for the class
222 // that is the nest-host of this class. This data has not been validated.
223 u2 _nest_host_index;
224 u2 _this_class_index; // constant pool entry
225
226 u2 _static_oop_field_count;// number of static oop fields in this klass
227 u2 _java_fields_count; // The number of declared Java fields
228
229 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
230
231 // _is_marked_dependent can be set concurrently, thus cannot be part of the
232 // _misc_flags.
233 bool _is_marked_dependent; // used for marking during flushing and deoptimization
234
235 // Class states are defined as ClassState (see above).
236 // Place the _init_state here to utilize the unused 2-byte after
237 // _idnum_allocated_count.
238 u1 _init_state; // state of class
239
240 // This can be used to quickly discriminate among the four kinds of
241 // InstanceKlass. This should be an enum (?)
242 static const unsigned _kind_other = 0; // concrete InstanceKlass
243 static const unsigned _kind_reference = 1; // InstanceRefKlass
244 static const unsigned _kind_class_loader = 2; // InstanceClassLoaderKlass
245 static const unsigned _kind_mirror = 3; // InstanceMirrorKlass
246
247 u1 _reference_type; // reference type
248 u1 _kind; // kind of InstanceKlass
249
250 enum {
251 _misc_rewritten = 1 << 0, // methods rewritten.
252 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
253 _misc_should_verify_class = 1 << 2, // allow caching of preverification
254 _misc_is_unsafe_anonymous = 1 << 3, // has embedded _unsafe_anonymous_host field
255 _misc_is_contended = 1 << 4, // marked with contended annotation
256 _misc_has_nonstatic_concrete_methods = 1 << 5, // class/superclass/implemented interfaces has non-static, concrete methods
257 _misc_declares_nonstatic_concrete_methods = 1 << 6, // directly declares non-static, concrete methods
258 _misc_has_been_redefined = 1 << 7, // class has been redefined
259 _misc_has_passed_fingerprint_check = 1 << 8, // when this class was loaded, the fingerprint computed from its
260 // code source was found to be matching the value recorded by AOT.
261 _misc_is_scratch_class = 1 << 9, // class is the redefined scratch class
262 _misc_is_shared_boot_class = 1 << 10, // defining class loader is boot class loader
263 _misc_is_shared_platform_class = 1 << 11, // defining class loader is platform class loader
264 _misc_is_shared_app_class = 1 << 12, // defining class loader is app class loader
265 _misc_has_resolved_methods = 1 << 13, // resolved methods table entries added for this class
266 _misc_is_being_redefined = 1 << 14, // used for locking redefinition
267 _misc_has_contended_annotations = 1 << 15 // has @Contended annotation
268 };
269 u2 shared_loader_type_bits() const {
270 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
271 }
272 u2 _misc_flags; // There is more space in access_flags for more flags.
273
274 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
275 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
276 JNIid* _jni_ids; // First JNI identifier for static fields in this class
277 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
278 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
279 uint64_t volatile _dep_context_last_cleaned;
280 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
281 #if INCLUDE_JVMTI
282 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
283 // Linked instanceKlasses of previous versions
284 InstanceKlass* _previous_versions;
285 // JVMTI fields can be moved to their own structure - see 6315920
286 // JVMTI: cached class file, before retransformable agent modified it in CFLH
287 JvmtiCachedClassFileData* _cached_class_file;
288 #endif
289
290 #if INCLUDE_JVMTI
291 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
292 #endif
293
294 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
295
296 // Method array.
297 Array<Method*>* _methods;
298 // Default Method Array, concrete methods inherited from interfaces
299 Array<Method*>* _default_methods;
300 // Interfaces (InstanceKlass*s) this class declares locally to implement.
301 Array<InstanceKlass*>* _local_interfaces;
302 // Interfaces (InstanceKlass*s) this class implements transitively.
303 Array<InstanceKlass*>* _transitive_interfaces;
304 // Int array containing the original order of method in the class file (for JVMTI).
305 Array<int>* _method_ordering;
306 // Int array containing the vtable_indices for default_methods
307 // offset matches _default_methods offset
308 Array<int>* _default_vtable_indices;
309
310 // Instance and static variable information, starts with 6-tuples of shorts
311 // [access, name index, sig index, initval index, low_offset, high_offset]
312 // for all fields, followed by the generic signature data at the end of
313 // the array. Only fields with generic signature attributes have the generic
314 // signature data set in the array. The fields array looks like following:
315 //
316 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
317 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
318 // ...
319 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
320 // [generic signature index]
321 // [generic signature index]
322 // ...
323 Array<u2>* _fields;
324
325 // embedded Java vtable follows here
326 // embedded Java itables follows here
327 // embedded static fields follows here
328 // embedded nonstatic oop-map blocks follows here
329 // embedded implementor of this interface follows here
330 // The embedded implementor only exists if the current klass is an
331 // iterface. The possible values of the implementor fall into following
332 // three cases:
333 // NULL: no implementor.
334 // A Klass* that's not itself: one implementor.
335 // Itself: more than one implementors.
336 // embedded unsafe_anonymous_host klass follows here
337 // The embedded host klass only exists in an unsafe anonymous class for
338 // dynamic language support (JSR 292 enabled). The host class grants
339 // its access privileges to this class also. The host class is either
340 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
341 // or an anonymous class loaded through normal classloading does not
342 // have this embedded field.
343 //
344
345 friend class SystemDictionary;
346
347 static bool _disable_method_binary_search;
348
349 public:
350 // The three BUILTIN class loader types
351 bool is_shared_boot_class() const {
352 return (_misc_flags & _misc_is_shared_boot_class) != 0;
353 }
354 bool is_shared_platform_class() const {
355 return (_misc_flags & _misc_is_shared_platform_class) != 0;
356 }
357 bool is_shared_app_class() const {
358 return (_misc_flags & _misc_is_shared_app_class) != 0;
359 }
360 // The UNREGISTERED class loader type
361 bool is_shared_unregistered_class() const {
362 return (_misc_flags & shared_loader_type_bits()) == 0;
363 }
364
365 void clear_shared_class_loader_type() {
366 _misc_flags &= ~shared_loader_type_bits();
367 }
368
369 void set_shared_class_loader_type(s2 loader_type);
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 ObjArrayKlass* array_klasses() const { return _array_klasses; }
398 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics
399 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; }
400 inline void release_set_array_klasses(ObjArrayKlass* 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 private:
436 friend class fieldDescriptor;
437 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
438
439 public:
440 int field_offset (int index) const { return field(index)->offset(); }
441 int field_access_flags(int index) const { return field(index)->access_flags(); }
442 Symbol* field_name (int index) const { return field(index)->name(constants()); }
443 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
444
445 // Number of Java declared fields
446 int java_fields_count() const { return (int)_java_fields_count; }
447
448 Array<u2>* fields() const { return _fields; }
449 void set_fields(Array<u2>* f, u2 java_fields_count) {
450 guarantee(_fields == NULL || f == NULL, "Just checking");
451 _fields = f;
452 _java_fields_count = java_fields_count;
453 }
454
455 // inner classes
456 Array<u2>* inner_classes() const { return _inner_classes; }
457 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
458
459 // nest members
460 Array<u2>* nest_members() const { return _nest_members; }
461 void set_nest_members(Array<u2>* m) { _nest_members = m; }
462
463 // nest-host index
464 jushort nest_host_index() const { return _nest_host_index; }
465 void set_nest_host_index(u2 i) { _nest_host_index = i; }
466 // dynamic nest member support
467 void set_nest_host(InstanceKlass* host, TRAPS);
468
469 // record components
470 Array<RecordComponent*>* record_components() const { return _record_components; }
471 void set_record_components(Array<RecordComponent*>* record_components) {
472 _record_components = record_components;
473 }
474 bool is_record() const { return _record_components != NULL; }
475
476 // permitted subclasses
477 Array<u2>* permitted_subclasses() const { return _permitted_subclasses; }
478 void set_permitted_subclasses(Array<u2>* s) { _permitted_subclasses = s; }
479
480 private:
481 // Called to verify that k is a member of this nest - does not look at k's nest-host
482 bool has_nest_member(InstanceKlass* k, TRAPS) const;
483
484 public:
485 // Used to construct informative IllegalAccessError messages at a higher level,
486 // if there was an issue resolving or validating the nest host.
487 // Returns NULL if there was no error.
488 const char* nest_host_error(TRAPS);
489 // Returns nest-host class, resolving and validating it if needed.
490 // Returns NULL if resolution is not possible from the calling context.
491 InstanceKlass* nest_host(TRAPS);
492 // Check if this klass is a nestmate of k - resolves this nest-host and k's
493 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
494
495 // Called to verify that k is a permitted subclass of this class
496 bool has_as_permitted_subclass(const InstanceKlass* k) const;
497
498 enum InnerClassAttributeOffset {
499 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
500 inner_class_inner_class_info_offset = 0,
501 inner_class_outer_class_info_offset = 1,
502 inner_class_inner_name_offset = 2,
503 inner_class_access_flags_offset = 3,
504 inner_class_next_offset = 4
505 };
506
507 enum EnclosingMethodAttributeOffset {
508 enclosing_method_class_index_offset = 0,
509 enclosing_method_method_index_offset = 1,
510 enclosing_method_attribute_size = 2
511 };
512
513 // method override check
514 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
515
516 // package
517 PackageEntry* package() const { return _package_entry; }
518 ModuleEntry* module() const;
519 bool in_unnamed_package() const { return (_package_entry == NULL); }
520 void set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS);
521 // If the package for the InstanceKlass is in the boot loader's package entry
522 // table then sets the classpath_index field so that
523 // get_system_package() will know to return a non-null value for the
524 // package's location. And, so that the package will be added to the list of
525 // packages returned by get_system_packages().
526 // For packages whose classes are loaded from the boot loader class path, the
527 // classpath_index indicates which entry on the boot loader class path.
528 void set_classpath_index(s2 path_index, TRAPS);
529 bool is_same_class_package(const Klass* class2) const;
530 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
531
532 // find an enclosing class
533 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
534
535 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
536 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
537
538 private:
539 // Check prohibited package ("java/" only loadable by boot or platform loaders)
540 static void check_prohibited_package(Symbol* class_name,
541 ClassLoaderData* loader_data,
542 TRAPS);
543 public:
544 // initialization state
545 bool is_loaded() const { return _init_state >= loaded; }
546 bool is_linked() const { return _init_state >= linked; }
547 bool is_initialized() const { return _init_state == fully_initialized; }
548 bool is_not_initialized() const { return _init_state < being_initialized; }
549 bool is_being_initialized() const { return _init_state == being_initialized; }
550 bool is_in_error_state() const { return _init_state == initialization_error; }
551 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
552 ClassState init_state() { return (ClassState)_init_state; }
553 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
554
555 // is this a sealed class
556 bool is_sealed() const;
557
558 // defineClass specified verification
559 bool should_verify_class() const {
560 return (_misc_flags & _misc_should_verify_class) != 0;
561 }
562 void set_should_verify_class(bool value) {
563 if (value) {
564 _misc_flags |= _misc_should_verify_class;
565 } else {
566 _misc_flags &= ~_misc_should_verify_class;
567 }
568 }
569
570 // marking
571 bool is_marked_dependent() const { return _is_marked_dependent; }
572 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
573
574 // initialization (virtuals from Klass)
575 bool should_be_initialized() const; // means that initialize should be called
576 void initialize(TRAPS);
577 void link_class(TRAPS);
578 bool link_class_or_fail(TRAPS); // returns false on failure
579 void rewrite_class(TRAPS);
580 void link_methods(TRAPS);
581 Method* class_initializer() const;
582
583 // set the class to initialized if no static initializer is present
584 void eager_initialize(Thread *thread);
585
586 // reference type
587 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
588 void set_reference_type(ReferenceType t) {
589 assert(t == (u1)t, "overflow");
590 _reference_type = (u1)t;
591 }
592
593 // this class cp index
594 u2 this_class_index() const { return _this_class_index; }
595 void set_this_class_index(u2 index) { _this_class_index = index; }
596
597 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
598
599 // find local field, returns true if found
600 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
601 // find field in direct superinterfaces, returns the interface in which the field is defined
602 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
603 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
604 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
605 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
606 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
607
608 // find a non-static or static field given its offset within the class.
609 bool contains_field_offset(int offset);
610
611 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
612 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
613
614 private:
615 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
616
617 public:
618 static void disable_method_binary_search() {
619 _disable_method_binary_search = true;
620 }
621
622 // find a local method (returns NULL if not found)
623 Method* find_method(const Symbol* name, const Symbol* signature) const;
624 static Method* find_method(const Array<Method*>* methods,
625 const Symbol* name,
626 const Symbol* signature);
627
628 // find a local method, but skip static methods
629 Method* find_instance_method(const Symbol* name, const Symbol* signature,
630 PrivateLookupMode private_mode) const;
631 static Method* find_instance_method(const Array<Method*>* methods,
632 const Symbol* name,
633 const Symbol* signature,
634 PrivateLookupMode private_mode);
635
636 // find a local method (returns NULL if not found)
637 Method* find_local_method(const Symbol* name,
638 const Symbol* signature,
639 OverpassLookupMode overpass_mode,
640 StaticLookupMode static_mode,
641 PrivateLookupMode private_mode) const;
642
643 // find a local method from given methods array (returns NULL if not found)
644 static Method* find_local_method(const Array<Method*>* methods,
645 const Symbol* name,
646 const Symbol* signature,
647 OverpassLookupMode overpass_mode,
648 StaticLookupMode static_mode,
649 PrivateLookupMode private_mode);
650
651 // find a local method index in methods or default_methods (returns -1 if not found)
652 static int find_method_index(const Array<Method*>* methods,
653 const Symbol* name,
654 const Symbol* signature,
655 OverpassLookupMode overpass_mode,
656 StaticLookupMode static_mode,
657 PrivateLookupMode private_mode);
658
659 // lookup operation (returns NULL if not found)
660 Method* uncached_lookup_method(const Symbol* name,
661 const Symbol* signature,
662 OverpassLookupMode overpass_mode,
663 PrivateLookupMode private_mode = find_private) const;
664
665 // lookup a method in all the interfaces that this class implements
666 // (returns NULL if not found)
667 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
668
669 // lookup a method in local defaults then in all interfaces
670 // (returns NULL if not found)
671 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
672
673 // Find method indices by name. If a method with the specified name is
674 // found the index to the first method is returned, and 'end' is filled in
675 // with the index of first non-name-matching method. If no method is found
676 // -1 is returned.
677 int find_method_by_name(const Symbol* name, int* end) const;
678 static int find_method_by_name(const Array<Method*>* methods,
679 const Symbol* name, int* end);
680
681 // constant pool
682 ConstantPool* constants() const { return _constants; }
683 void set_constants(ConstantPool* c) { _constants = c; }
684
685 // protection domain
686 oop protection_domain() const;
687
688 // signers
689 objArrayOop signers() const;
690
691 // host class
692 InstanceKlass* unsafe_anonymous_host() const {
693 InstanceKlass** hk = adr_unsafe_anonymous_host();
694 if (hk == NULL) {
695 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
696 return NULL;
697 } else {
698 assert(*hk != NULL, "host klass should always be set if the address is not null");
699 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
700 return *hk;
701 }
702 }
703 void set_unsafe_anonymous_host(const InstanceKlass* host) {
704 assert(is_unsafe_anonymous(), "not unsafe anonymous");
705 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
706 assert(addr != NULL, "no reversed space");
707 if (addr != NULL) {
708 *addr = host;
709 }
710 }
711 bool is_unsafe_anonymous() const {
712 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
713 }
714 void set_is_unsafe_anonymous(bool value) {
715 if (value) {
716 _misc_flags |= _misc_is_unsafe_anonymous;
717 } else {
718 _misc_flags &= ~_misc_is_unsafe_anonymous;
719 }
720 }
721
722 bool is_contended() const {
723 return (_misc_flags & _misc_is_contended) != 0;
724 }
725 void set_is_contended(bool value) {
726 if (value) {
727 _misc_flags |= _misc_is_contended;
728 } else {
729 _misc_flags &= ~_misc_is_contended;
730 }
731 }
732
733 // source file name
734 Symbol* source_file_name() const { return _constants->source_file_name(); }
735 u2 source_file_name_index() const { return _constants->source_file_name_index(); }
736 void set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
737
738 // minor and major version numbers of class file
739 u2 minor_version() const { return _constants->minor_version(); }
740 void set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
741 u2 major_version() const { return _constants->major_version(); }
742 void set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
743
744 // source debug extension
745 const char* source_debug_extension() const { return _source_debug_extension; }
746 void set_source_debug_extension(const char* array, int length);
747
748 // nonstatic oop-map blocks
749 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
750 return oop_map_count * OopMapBlock::size_in_words();
751 }
752 unsigned int nonstatic_oop_map_count() const {
753 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
754 }
755 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
756 void set_nonstatic_oop_map_size(int words) {
757 _nonstatic_oop_map_size = words;
758 }
759
760 bool has_contended_annotations() const {
761 return ((_misc_flags & _misc_has_contended_annotations) != 0);
762 }
763 void set_has_contended_annotations(bool value) {
764 if (value) {
765 _misc_flags |= _misc_has_contended_annotations;
766 } else {
767 _misc_flags &= ~_misc_has_contended_annotations;
768 }
769 }
770
771 #if INCLUDE_JVMTI
772 // Redefinition locking. Class can only be redefined by one thread at a time.
773 bool is_being_redefined() const {
774 return ((_misc_flags & _misc_is_being_redefined) != 0);
775 }
776 void set_is_being_redefined(bool value) {
777 if (value) {
778 _misc_flags |= _misc_is_being_redefined;
779 } else {
780 _misc_flags &= ~_misc_is_being_redefined;
781 }
782 }
783
784 // RedefineClasses() support for previous versions:
785 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
786 void purge_previous_version_list();
787
788 InstanceKlass* previous_versions() const { return _previous_versions; }
789 #else
790 InstanceKlass* previous_versions() const { return NULL; }
791 #endif
792
793 InstanceKlass* get_klass_version(int version) {
794 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
795 if (ik->constants()->version() == version) {
796 return ik;
797 }
798 }
799 return NULL;
800 }
801
802 bool has_been_redefined() const {
803 return (_misc_flags & _misc_has_been_redefined) != 0;
804 }
805 void set_has_been_redefined() {
806 _misc_flags |= _misc_has_been_redefined;
807 }
808
809 bool has_passed_fingerprint_check() const {
810 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
811 }
812 void set_has_passed_fingerprint_check(bool b) {
813 if (b) {
814 _misc_flags |= _misc_has_passed_fingerprint_check;
815 } else {
816 _misc_flags &= ~_misc_has_passed_fingerprint_check;
817 }
818 }
819 bool supers_have_passed_fingerprint_checks();
820
821 static bool should_store_fingerprint(bool is_hidden_or_anonymous);
822 bool should_store_fingerprint() const { return should_store_fingerprint(is_hidden() || is_unsafe_anonymous()); }
823 bool has_stored_fingerprint() const;
824 uint64_t get_stored_fingerprint() const;
825 void store_fingerprint(uint64_t fingerprint);
826
827 bool is_scratch_class() const {
828 return (_misc_flags & _misc_is_scratch_class) != 0;
829 }
830
831 void set_is_scratch_class() {
832 _misc_flags |= _misc_is_scratch_class;
833 }
834
835 bool has_resolved_methods() const {
836 return (_misc_flags & _misc_has_resolved_methods) != 0;
837 }
838
839 void set_has_resolved_methods() {
840 _misc_flags |= _misc_has_resolved_methods;
841 }
842 private:
843
844 void set_kind(unsigned kind) {
845 _kind = (u1)kind;
846 }
847
848 bool is_kind(unsigned desired) const {
849 return _kind == (u1)desired;
850 }
851
852 public:
853
854 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
855 bool is_other_instance_klass() const { return is_kind(_kind_other); }
856 bool is_reference_instance_klass() const { return is_kind(_kind_reference); }
857 bool is_mirror_instance_klass() const { return is_kind(_kind_mirror); }
858 bool is_class_loader_instance_klass() const { return is_kind(_kind_class_loader); }
859
860 #if INCLUDE_JVMTI
861
862 void init_previous_versions() {
863 _previous_versions = NULL;
864 }
865
866 private:
867 static bool _has_previous_versions;
868 public:
869 static void purge_previous_versions(InstanceKlass* ik) {
870 if (ik->has_been_redefined()) {
871 ik->purge_previous_version_list();
872 }
873 }
874
875 static bool has_previous_versions_and_reset();
876 static bool has_previous_versions() { return _has_previous_versions; }
877
878 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
879 void set_cached_class_file(JvmtiCachedClassFileData *data) {
880 _cached_class_file = data;
881 }
882 JvmtiCachedClassFileData * get_cached_class_file();
883 jint get_cached_class_file_len();
884 unsigned char * get_cached_class_file_bytes();
885
886 // JVMTI: Support for caching of field indices, types, and offsets
887 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
888 _jvmti_cached_class_field_map = descriptor;
889 }
890 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
891 return _jvmti_cached_class_field_map;
892 }
893 #else // INCLUDE_JVMTI
894
895 static void purge_previous_versions(InstanceKlass* ik) { return; };
896 static bool has_previous_versions_and_reset() { return false; }
897
898 void set_cached_class_file(JvmtiCachedClassFileData *data) {
899 assert(data == NULL, "unexpected call with JVMTI disabled");
900 }
901 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
902
903 #endif // INCLUDE_JVMTI
904
905 bool has_nonstatic_concrete_methods() const {
906 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
907 }
908 void set_has_nonstatic_concrete_methods(bool b) {
909 if (b) {
910 _misc_flags |= _misc_has_nonstatic_concrete_methods;
911 } else {
912 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
913 }
914 }
915
916 bool declares_nonstatic_concrete_methods() const {
917 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
918 }
919 void set_declares_nonstatic_concrete_methods(bool b) {
920 if (b) {
921 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
922 } else {
923 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
924 }
925 }
926
927 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
928 inline u2 next_method_idnum();
929 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
930
931 // generics support
932 Symbol* generic_signature() const { return _constants->generic_signature(); }
933 u2 generic_signature_index() const { return _constants->generic_signature_index(); }
934 void set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
935
936 u2 enclosing_method_data(int offset) const;
937 u2 enclosing_method_class_index() const {
938 return enclosing_method_data(enclosing_method_class_index_offset);
939 }
940 u2 enclosing_method_method_index() {
941 return enclosing_method_data(enclosing_method_method_index_offset);
942 }
943 void set_enclosing_method_indices(u2 class_index,
944 u2 method_index);
945
946 // jmethodID support
947 jmethodID get_jmethod_id(const methodHandle& method_h);
948 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
949 jmethodID new_id, jmethodID* new_jmeths,
950 jmethodID* to_dealloc_id_p,
951 jmethodID** to_dealloc_jmeths_p);
952 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
953 size_t *length_p, jmethodID* id_p);
954 void ensure_space_for_methodids(int start_offset = 0);
955 jmethodID jmethod_id_or_null(Method* method);
956
957 // annotations support
958 Annotations* annotations() const { return _annotations; }
959 void set_annotations(Annotations* anno) { _annotations = anno; }
960
961 AnnotationArray* class_annotations() const {
962 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
963 }
964 Array<AnnotationArray*>* fields_annotations() const {
965 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
966 }
967 AnnotationArray* class_type_annotations() const {
968 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
969 }
970 Array<AnnotationArray*>* fields_type_annotations() const {
971 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
972 }
973 // allocation
974 instanceOop allocate_instance(TRAPS);
975 static instanceOop allocate_instance(oop cls, TRAPS);
976
977 // additional member function to return a handle
978 instanceHandle allocate_instance_handle(TRAPS);
979
980 objArrayOop allocate_objArray(int n, int length, TRAPS);
981 // Helper function
982 static instanceOop register_finalizer(instanceOop i, TRAPS);
983
984 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
985 // if not, throw either an Error or an Exception.
986 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
987
988 // initialization
989 void call_class_initializer(TRAPS);
990 void set_initialization_state_and_notify(ClassState state, TRAPS);
991
992 // OopMapCache support
993 OopMapCache* oop_map_cache() { return _oop_map_cache; }
994 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
995 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
996
997 // JNI identifier support (for static fields - for jni performance)
998 JNIid* jni_ids() { return _jni_ids; }
999 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
1000 JNIid* jni_id_for(int offset);
1001
1002 // maintenance of deoptimization dependencies
1003 inline DependencyContext dependencies();
1004 int mark_dependent_nmethods(KlassDepChange& changes);
1005 void add_dependent_nmethod(nmethod* nm);
1006 void remove_dependent_nmethod(nmethod* nm);
1007 void clean_dependency_context();
1008
1009 // On-stack replacement support
1010 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1011 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1012 void add_osr_nmethod(nmethod* n);
1013 bool remove_osr_nmethod(nmethod* n);
1014 int mark_osr_nmethods(const Method* m);
1015 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1016
1017 #if INCLUDE_JVMTI
1018 // Breakpoint support (see methods on Method* for details)
1019 BreakpointInfo* breakpoints() const { return _breakpoints; };
1020 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1021 #endif
1022
1023 // support for stub routines
1024 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1025 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1026 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1027
1028 // subclass/subinterface checks
1029 bool implements_interface(Klass* k) const;
1030 bool is_same_or_direct_interface(Klass* k) const;
1031
1032 #ifdef ASSERT
1033 // check whether this class or one of its superclasses was redefined
1034 bool has_redefined_this_or_super() const;
1035 #endif
1036
1037 // Access to the implementor of an interface.
1038 Klass* implementor() const;
1039 void set_implementor(Klass* k);
1040 int nof_implementors() const;
1041 void add_implementor(Klass* k); // k is a new class that implements this interface
1042 void init_implementor(); // initialize
1043
1044 // link this class into the implementors list of every interface it implements
1045 void process_interfaces(Thread *thread);
1046
1047 // virtual operations from Klass
1048 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1049 Array<InstanceKlass*>* transitive_interfaces);
1050 bool can_be_primary_super_slow() const;
1051 int oop_size(oop obj) const { return size_helper(); }
1052 // slow because it's a virtual call and used for verifying the layout_helper.
1053 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1054 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1055
1056 // Iterators
1057 void do_local_static_fields(FieldClosure* cl);
1058 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1059 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1060
1061 void methods_do(void f(Method* method));
1062 void array_klasses_do(void f(Klass* k));
1063 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1064
1065 static InstanceKlass* cast(Klass* k) {
1066 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1067 }
1068
1069 static const InstanceKlass* cast(const Klass* k) {
1070 assert(k != NULL, "k should not be null");
1071 assert(k->is_instance_klass(), "cast to InstanceKlass");
1072 return static_cast<const InstanceKlass*>(k);
1073 }
1074
1075 virtual InstanceKlass* java_super() const {
1076 return (super() == NULL) ? NULL : cast(super());
1077 }
1078
1079 // Sizing (in words)
1080 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1081
1082 static int size(int vtable_length, int itable_length,
1083 int nonstatic_oop_map_size,
1084 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1085 return align_metadata_size(header_size() +
1086 vtable_length +
1087 itable_length +
1088 nonstatic_oop_map_size +
1089 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1090 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1091 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1092 }
1093 int size() const { return size(vtable_length(),
1094 itable_length(),
1095 nonstatic_oop_map_size(),
1096 is_interface(),
1097 is_unsafe_anonymous(),
1098 has_stored_fingerprint());
1099 }
1100
1101 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1102 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1103
1104 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1105
1106 oop static_field_base_raw() { return java_mirror(); }
1107
1108 OopMapBlock* start_of_nonstatic_oop_maps() const {
1109 return (OopMapBlock*)(start_of_itable() + itable_length());
1110 }
1111
1112 Klass** end_of_nonstatic_oop_maps() const {
1113 return (Klass**)(start_of_nonstatic_oop_maps() +
1114 nonstatic_oop_map_count());
1115 }
1116
1117 Klass* volatile* adr_implementor() const {
1118 if (is_interface()) {
1119 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1120 } else {
1121 return NULL;
1122 }
1123 };
1124
1125 InstanceKlass** adr_unsafe_anonymous_host() const {
1126 if (is_unsafe_anonymous()) {
1127 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1128 if (adr_impl != NULL) {
1129 return adr_impl + 1;
1130 } else {
1131 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1132 }
1133 } else {
1134 return NULL;
1135 }
1136 }
1137
1138 address adr_fingerprint() const {
1139 if (has_stored_fingerprint()) {
1140 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1141 if (adr_host != NULL) {
1142 return (address)(adr_host + 1);
1143 }
1144
1145 Klass* volatile* adr_impl = adr_implementor();
1146 if (adr_impl != NULL) {
1147 return (address)(adr_impl + 1);
1148 }
1149
1150 return (address)end_of_nonstatic_oop_maps();
1151 } else {
1152 return NULL;
1153 }
1154 }
1155
1156 // Use this to return the size of an instance in heap words:
1157 int size_helper() const {
1158 return layout_helper_to_size_helper(layout_helper());
1159 }
1160
1161 // This bit is initialized in classFileParser.cpp.
1162 // It is false under any of the following conditions:
1163 // - the class is abstract (including any interface)
1164 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1165 // - the class size is larger than FastAllocateSizeLimit
1166 // - the class is java/lang/Class, which cannot be allocated directly
1167 bool can_be_fastpath_allocated() const {
1168 return !layout_helper_needs_slow_path(layout_helper());
1169 }
1170
1171 // Java itable
1172 klassItable itable() const; // return klassItable wrapper
1173 Method* method_at_itable(Klass* holder, int index, TRAPS);
1174
1175 #if INCLUDE_JVMTI
1176 void adjust_default_methods(bool* trace_name_printed);
1177 #endif // INCLUDE_JVMTI
1178
1179 void clean_weak_instanceklass_links();
1180 private:
1181 void clean_implementors_list();
1182 void clean_method_data();
1183
1184 public:
1185 // Explicit metaspace deallocation of fields
1186 // For RedefineClasses and class file parsing errors, we need to deallocate
1187 // instanceKlasses and the metadata they point to.
1188 void deallocate_contents(ClassLoaderData* loader_data);
1189 static void deallocate_methods(ClassLoaderData* loader_data,
1190 Array<Method*>* methods);
1191 void static deallocate_interfaces(ClassLoaderData* loader_data,
1192 const Klass* super_klass,
1193 Array<InstanceKlass*>* local_interfaces,
1194 Array<InstanceKlass*>* transitive_interfaces);
1195 void static deallocate_record_components(ClassLoaderData* loader_data,
1196 Array<RecordComponent*>* record_component);
1197
1198 // The constant pool is on stack if any of the methods are executing or
1199 // referenced by handles.
1200 bool on_stack() const { return _constants->on_stack(); }
1201
1202 // callbacks for actions during class unloading
1203 static void unload_class(InstanceKlass* ik);
1204
1205 virtual void release_C_heap_structures();
1206
1207 // Naming
1208 const char* signature_name() const;
1209
1210 // Oop fields (and metadata) iterators
1211 //
1212 // The InstanceKlass iterators also visits the Object's klass.
1213
1214 // Forward iteration
1215 public:
1216 // Iterate over all oop fields in the oop maps.
1217 template <typename T, class OopClosureType>
1218 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1219
1220 // Iterate over all oop fields and metadata.
1221 template <typename T, class OopClosureType>
1222 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1223
1224 // Iterate over all oop fields in one oop map.
1225 template <typename T, class OopClosureType>
1226 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1227
1228
1229 // Reverse iteration
1230 // Iterate over all oop fields and metadata.
1231 template <typename T, class OopClosureType>
1232 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1233
1234 private:
1235 // Iterate over all oop fields in the oop maps.
1236 template <typename T, class OopClosureType>
1237 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1238
1239 // Iterate over all oop fields in one oop map.
1240 template <typename T, class OopClosureType>
1241 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1242
1243
1244 // Bounded range iteration
1245 public:
1246 // Iterate over all oop fields in the oop maps.
1247 template <typename T, class OopClosureType>
1248 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1249
1250 // Iterate over all oop fields and metadata.
1251 template <typename T, class OopClosureType>
1252 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1253
1254 private:
1255 // Iterate over all oop fields in one oop map.
1256 template <typename T, class OopClosureType>
1257 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1258
1259
1260 public:
1261 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1262
1263 private:
1264 // initialization state
1265 void set_init_state(ClassState state);
1266 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1267 void set_init_thread(Thread *thread) { _init_thread = thread; }
1268
1269 // The RedefineClasses() API can cause new method idnums to be needed
1270 // which will cause the caches to grow. Safety requires different
1271 // cache management logic if the caches can grow instead of just
1272 // going from NULL to non-NULL.
1273 bool idnum_can_increment() const { return has_been_redefined(); }
1274 inline jmethodID* methods_jmethod_ids_acquire() const;
1275 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1276
1277 // Lock during initialization
1278 public:
1279 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1280 // Must be one per class and it has to be a VM internal object so java code
1281 // cannot lock it (like the mirror).
1282 // It has to be an object not a Mutex because it's held through java calls.
1283 oop init_lock() const;
1284 private:
1285 void fence_and_clear_init_lock();
1286
1287 bool link_class_impl (TRAPS);
1288 bool verify_code (TRAPS);
1289 void initialize_impl (TRAPS);
1290 void initialize_super_interfaces (TRAPS);
1291 void eager_initialize_impl ();
1292 /* jni_id_for_impl for jfieldID only */
1293 JNIid* jni_id_for_impl (int offset);
1294
1295 // Returns the array class for the n'th dimension
1296 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1297
1298 // Returns the array class with this class as element type
1299 Klass* array_klass_impl(bool or_null, TRAPS);
1300
1301 // find a local method (returns NULL if not found)
1302 Method* find_method_impl(const Symbol* name,
1303 const Symbol* signature,
1304 OverpassLookupMode overpass_mode,
1305 StaticLookupMode static_mode,
1306 PrivateLookupMode private_mode) const;
1307
1308 static Method* find_method_impl(const Array<Method*>* methods,
1309 const Symbol* name,
1310 const Symbol* signature,
1311 OverpassLookupMode overpass_mode,
1312 StaticLookupMode static_mode,
1313 PrivateLookupMode private_mode);
1314
1315 // Free CHeap allocated fields.
1316 void release_C_heap_structures_internal();
1317
1318 #if INCLUDE_JVMTI
1319 // RedefineClasses support
1320 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1321 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1322 #endif
1323 public:
1324 // CDS support - remove and restore oops from metadata. Oops are not shared.
1325 virtual void remove_unshareable_info();
1326 virtual void remove_java_mirror();
1327 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS);
1328
1329 // jvm support
1330 jint compute_modifier_flags(TRAPS) const;
1331
1332 public:
1333 // JVMTI support
1334 jint jvmti_class_status() const;
1335
1336 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1337
1338 public:
1339 // Printing
1340 #ifndef PRODUCT
1341 void print_on(outputStream* st) const;
1342 #endif
1343 void print_value_on(outputStream* st) const;
1344
1345 void oop_print_value_on(oop obj, outputStream* st);
1346
1347 #ifndef PRODUCT
1348 void oop_print_on (oop obj, outputStream* st);
1349
1350 void print_dependent_nmethods(bool verbose = false);
1351 bool is_dependent_nmethod(nmethod* nm);
1352 bool verify_itable_index(int index);
1353 #endif
1354
1355 const char* internal_name() const;
1356
1357 // Verification
1358 void verify_on(outputStream* st);
1359
1360 void oop_verify_on(oop obj, outputStream* st);
1361
1362 // Logging
1363 void print_class_load_logging(ClassLoaderData* loader_data,
1364 const char* module_name,
1365 const ClassFileStream* cfs) const;
1366 };
1367
1368 // for adding methods
1369 // UNSET_IDNUM return means no more ids available
1370 inline u2 InstanceKlass::next_method_idnum() {
1371 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1372 return ConstMethod::UNSET_IDNUM; // no more ids available
1373 } else {
1374 return _idnum_allocated_count++;
1375 }
1376 }
1377
1378
1379 /* JNIid class for jfieldIDs only */
1380 class JNIid: public CHeapObj<mtClass> {
1381 friend class VMStructs;
1382 private:
1383 Klass* _holder;
1384 JNIid* _next;
1385 int _offset;
1386 #ifdef ASSERT
1387 bool _is_static_field_id;
1388 #endif
1389
1390 public:
1391 // Accessors
1392 Klass* holder() const { return _holder; }
1393 int offset() const { return _offset; }
1394 JNIid* next() { return _next; }
1395 // Constructor
1396 JNIid(Klass* holder, int offset, JNIid* next);
1397 // Identifier lookup
1398 JNIid* find(int offset);
1399
1400 bool find_local_field(fieldDescriptor* fd) {
1401 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1402 }
1403
1404 static void deallocate(JNIid* id);
1405 // Debugging
1406 #ifdef ASSERT
1407 bool is_static_field_id() const { return _is_static_field_id; }
1408 void set_is_static_field_id() { _is_static_field_id = true; }
1409 #endif
1410 void verify(Klass* holder);
1411 };
1412
1413 // An iterator that's used to access the inner classes indices in the
1414 // InstanceKlass::_inner_classes array.
1415 class InnerClassesIterator : public StackObj {
1416 private:
1417 Array<jushort>* _inner_classes;
1418 int _length;
1419 int _idx;
1420 public:
1421
1422 InnerClassesIterator(const InstanceKlass* k) {
1423 _inner_classes = k->inner_classes();
1424 if (k->inner_classes() != NULL) {
1425 _length = _inner_classes->length();
1426 // The inner class array's length should be the multiple of
1427 // inner_class_next_offset if it only contains the InnerClasses
1428 // attribute data, or it should be
1429 // n*inner_class_next_offset+enclosing_method_attribute_size
1430 // if it also contains the EnclosingMethod data.
1431 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1432 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1433 "just checking");
1434 // Remove the enclosing_method portion if exists.
1435 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1436 _length -= InstanceKlass::enclosing_method_attribute_size;
1437 }
1438 } else {
1439 _length = 0;
1440 }
1441 _idx = 0;
1442 }
1443
1444 int length() const {
1445 return _length;
1446 }
1447
1448 void next() {
1449 _idx += InstanceKlass::inner_class_next_offset;
1450 }
1451
1452 bool done() const {
1453 return (_idx >= _length);
1454 }
1455
1456 u2 inner_class_info_index() const {
1457 return _inner_classes->at(
1458 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1459 }
1460
1461 void set_inner_class_info_index(u2 index) {
1462 _inner_classes->at_put(
1463 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1464 }
1465
1466 u2 outer_class_info_index() const {
1467 return _inner_classes->at(
1468 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1469 }
1470
1471 void set_outer_class_info_index(u2 index) {
1472 _inner_classes->at_put(
1473 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1474 }
1475
1476 u2 inner_name_index() const {
1477 return _inner_classes->at(
1478 _idx + InstanceKlass::inner_class_inner_name_offset);
1479 }
1480
1481 void set_inner_name_index(u2 index) {
1482 _inner_classes->at_put(
1483 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1484 }
1485
1486 u2 inner_access_flags() const {
1487 return _inner_classes->at(
1488 _idx + InstanceKlass::inner_class_access_flags_offset);
1489 }
1490 };
1491
1492 #endif // SHARE_OOPS_INSTANCEKLASS_HPP