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 Klass* 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 // The NestHost attribute. The class info index for the class
195 // that is the nest-host of this class. This data has not been validated.
196 jushort _nest_host_index;
197
198 // Resolved nest-host klass: either true nest-host or self if we are not nested.
199 // By always being set it makes nest-member access checks simpler.
200 InstanceKlass* _nest_host;
201
202 // The contents of the Record attribute.
203 Array<RecordComponent*>* _record_components;
204
205 // the source debug extension for this klass, NULL if not specified.
206 // Specified as UTF-8 string without terminating zero byte in the classfile,
207 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
208 const char* _source_debug_extension;
209 // Array name derived from this class which needs unreferencing
210 // if this class is unloaded.
211 Symbol* _array_name;
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 // Constant pool index to the utf8 entry of the Generic signature,
218 // or 0 if none.
219 u2 _generic_signature_index;
220 // Constant pool index to the utf8 entry for the name of source file
221 // containing this klass, 0 if not specified.
222 u2 _source_file_name_index;
223 u2 _static_oop_field_count;// number of static oop fields in this klass
224 u2 _java_fields_count; // The number of declared Java fields
225 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
226
227 int _itable_len; // length of Java itable (in words)
228 // _is_marked_dependent can be set concurrently, thus cannot be part of the
229 // _misc_flags.
230 bool _is_marked_dependent; // used for marking during flushing and deoptimization
231
232 // The low two bits of _misc_flags contains the kind field.
233 // This can be used to quickly discriminate among the four kinds of
234 // InstanceKlass.
235
236 static const unsigned _misc_kind_field_size = 2;
237 static const unsigned _misc_kind_field_pos = 0;
238 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
239
240 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
241 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
242 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
243 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
244
245 // Start after _misc_kind field.
246 enum {
247 _misc_rewritten = 1 << 2, // methods rewritten.
248 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
249 _misc_should_verify_class = 1 << 4, // allow caching of preverification
250 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field
251 _misc_is_contended = 1 << 6, // marked with contended annotation
252 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
253 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
254 _misc_has_been_redefined = 1 << 9, // class has been redefined
255 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
256 // code source was found to be matching the value recorded by AOT.
257 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
258 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
259 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
260 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
261 _misc_has_resolved_methods = 1 << 15, // resolved methods table entries added for this class
262 _misc_is_being_redefined = 1 << 16, // used for locking redefinition
263 _misc_has_contended_annotations = 1 << 17 // has @Contended annotation
264 };
265 u2 loader_type_bits() {
266 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
267 }
268 u4 _misc_flags;
269 u2 _minor_version; // minor version number of class file
270 u2 _major_version; // major version number of class file
271 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
272 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
273 JNIid* _jni_ids; // First JNI identifier for static fields in this class
274 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
275 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
276 uint64_t volatile _dep_context_last_cleaned;
277 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
278 #if INCLUDE_JVMTI
279 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
280 // Linked instanceKlasses of previous versions
281 InstanceKlass* _previous_versions;
282 // JVMTI fields can be moved to their own structure - see 6315920
283 // JVMTI: cached class file, before retransformable agent modified it in CFLH
284 JvmtiCachedClassFileData* _cached_class_file;
285 #endif
286
287 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
288
289 // Class states are defined as ClassState (see above).
290 // Place the _init_state here to utilize the unused 2-byte after
291 // _idnum_allocated_count.
292 u1 _init_state; // state of class
293 u1 _reference_type; // reference type
294
295 u2 _this_class_index; // constant pool entry
296 #if INCLUDE_JVMTI
297 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
298 #endif
299
300 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
301
302 // Method array.
303 Array<Method*>* _methods;
304 // Default Method Array, concrete methods inherited from interfaces
305 Array<Method*>* _default_methods;
306 // Interfaces (InstanceKlass*s) this class declares locally to implement.
307 Array<InstanceKlass*>* _local_interfaces;
308 // Interfaces (InstanceKlass*s) this class implements transitively.
309 Array<InstanceKlass*>* _transitive_interfaces;
310 // Int array containing the original order of method in the class file (for JVMTI).
311 Array<int>* _method_ordering;
312 // Int array containing the vtable_indices for default_methods
313 // offset matches _default_methods offset
314 Array<int>* _default_vtable_indices;
315
316 // Instance and static variable information, starts with 6-tuples of shorts
317 // [access, name index, sig index, initval index, low_offset, high_offset]
318 // for all fields, followed by the generic signature data at the end of
319 // the array. Only fields with generic signature attributes have the generic
320 // signature data set in the array. The fields array looks like following:
321 //
322 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
323 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
324 // ...
325 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
326 // [generic signature index]
327 // [generic signature index]
328 // ...
329 Array<u2>* _fields;
330
331 // embedded Java vtable follows here
332 // embedded Java itables follows here
333 // embedded static fields follows here
334 // embedded nonstatic oop-map blocks follows here
335 // embedded implementor of this interface follows here
336 // The embedded implementor only exists if the current klass is an
337 // iterface. The possible values of the implementor fall into following
338 // three cases:
339 // NULL: no implementor.
340 // A Klass* that's not itself: one implementor.
341 // Itself: more than one implementors.
342 // embedded unsafe_anonymous_host klass follows here
343 // The embedded host klass only exists in an unsafe anonymous class for
344 // dynamic language support (JSR 292 enabled). The host class grants
345 // its access privileges to this class also. The host class is either
346 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
347 // or an anonymous class loaded through normal classloading does not
348 // have this embedded field.
349 //
350
351 friend class SystemDictionary;
352
353 static bool _disable_method_binary_search;
354
355 public:
356 u2 loader_type() {
357 return _misc_flags & loader_type_bits();
358 }
359
360 bool is_shared_boot_class() const {
361 return (_misc_flags & _misc_is_shared_boot_class) != 0;
362 }
363 bool is_shared_platform_class() const {
364 return (_misc_flags & _misc_is_shared_platform_class) != 0;
365 }
366 bool is_shared_app_class() const {
367 return (_misc_flags & _misc_is_shared_app_class) != 0;
368 }
369
370 void clear_class_loader_type() {
371 _misc_flags &= ~loader_type_bits();
372 }
373
374 void set_class_loader_type(s2 loader_type);
375
376 bool has_nonstatic_fields() const {
377 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
378 }
379 void set_has_nonstatic_fields(bool b) {
380 if (b) {
381 _misc_flags |= _misc_has_nonstatic_fields;
382 } else {
383 _misc_flags &= ~_misc_has_nonstatic_fields;
384 }
385 }
386
387 // field sizes
388 int nonstatic_field_size() const { return _nonstatic_field_size; }
389 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
390
391 int static_field_size() const { return _static_field_size; }
392 void set_static_field_size(int size) { _static_field_size = size; }
393
394 int static_oop_field_count() const { return (int)_static_oop_field_count; }
395 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
396
397 // Java itable
398 int itable_length() const { return _itable_len; }
399 void set_itable_length(int len) { _itable_len = len; }
400
401 // array klasses
402 Klass* array_klasses() const { return _array_klasses; }
403 inline Klass* array_klasses_acquire() const; // load with acquire semantics
404 void set_array_klasses(Klass* k) { _array_klasses = k; }
405 inline void release_set_array_klasses(Klass* k); // store with release semantics
406
407 // methods
408 Array<Method*>* methods() const { return _methods; }
409 void set_methods(Array<Method*>* a) { _methods = a; }
410 Method* method_with_idnum(int idnum);
411 Method* method_with_orig_idnum(int idnum);
412 Method* method_with_orig_idnum(int idnum, int version);
413
414 // method ordering
415 Array<int>* method_ordering() const { return _method_ordering; }
416 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
417 void copy_method_ordering(const intArray* m, TRAPS);
418
419 // default_methods
420 Array<Method*>* default_methods() const { return _default_methods; }
421 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
422
423 // default method vtable_indices
424 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
425 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
426 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
427
428 // interfaces
429 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
430 void set_local_interfaces(Array<InstanceKlass*>* a) {
431 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
432 _local_interfaces = a; }
433
434 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
435 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
436 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
437 _transitive_interfaces = a;
438 }
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 // record components
473 Array<RecordComponent*>* record_components() const { return _record_components; }
474 void set_record_components(Array<RecordComponent*>* record_components) {
475 _record_components = record_components;
476 }
477 bool is_record() const { return _record_components != NULL; }
478
479 private:
480 // Called to verify that k is a member of this nest - does not look at k's nest-host
481 bool has_nest_member(InstanceKlass* k, TRAPS) const;
482
483 public:
484 // Returns nest-host class, resolving and validating it if needed
485 // Returns NULL if an exception occurs during loading, or validation fails
486 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
487 // Check if this klass is a nestmate of k - resolves this nest-host and k's
488 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
489
490 enum InnerClassAttributeOffset {
491 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
492 inner_class_inner_class_info_offset = 0,
493 inner_class_outer_class_info_offset = 1,
494 inner_class_inner_name_offset = 2,
495 inner_class_access_flags_offset = 3,
496 inner_class_next_offset = 4
497 };
498
499 enum EnclosingMethodAttributeOffset {
500 enclosing_method_class_index_offset = 0,
501 enclosing_method_method_index_offset = 1,
502 enclosing_method_attribute_size = 2
503 };
504
505 // method override check
506 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
507
508 // package
509 PackageEntry* package() const { return _package_entry; }
510 ModuleEntry* module() const;
511 bool in_unnamed_package() const { return (_package_entry == NULL); }
512 void set_package(PackageEntry* p) { _package_entry = p; }
513 void set_package(ClassLoaderData* loader_data, TRAPS);
514 bool is_same_class_package(const Klass* class2) const;
515 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
516
517 // find an enclosing class
518 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
519
520 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
521 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
522
523 private:
524 // Check prohibited package ("java/" only loadable by boot or platform loaders)
525 static void check_prohibited_package(Symbol* class_name,
526 ClassLoaderData* loader_data,
527 TRAPS);
528 public:
529 // initialization state
530 bool is_loaded() const { return _init_state >= loaded; }
531 bool is_linked() const { return _init_state >= linked; }
532 bool is_initialized() const { return _init_state == fully_initialized; }
533 bool is_not_initialized() const { return _init_state < being_initialized; }
534 bool is_being_initialized() const { return _init_state == being_initialized; }
535 bool is_in_error_state() const { return _init_state == initialization_error; }
536 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
537 ClassState init_state() { return (ClassState)_init_state; }
538 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
539
540 // defineClass specified verification
541 bool should_verify_class() const {
542 return (_misc_flags & _misc_should_verify_class) != 0;
543 }
544 void set_should_verify_class(bool value) {
545 if (value) {
546 _misc_flags |= _misc_should_verify_class;
547 } else {
548 _misc_flags &= ~_misc_should_verify_class;
549 }
550 }
551
552 // marking
553 bool is_marked_dependent() const { return _is_marked_dependent; }
554 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
555
556 // initialization (virtuals from Klass)
557 bool should_be_initialized() const; // means that initialize should be called
558 void initialize(TRAPS);
559 void link_class(TRAPS);
560 bool link_class_or_fail(TRAPS); // returns false on failure
561 void rewrite_class(TRAPS);
562 void link_methods(TRAPS);
563 Method* class_initializer() const;
564
565 // set the class to initialized if no static initializer is present
566 void eager_initialize(Thread *thread);
567
568 // reference type
569 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
570 void set_reference_type(ReferenceType t) {
571 assert(t == (u1)t, "overflow");
572 _reference_type = (u1)t;
573 }
574
575 // this class cp index
576 u2 this_class_index() const { return _this_class_index; }
577 void set_this_class_index(u2 index) { _this_class_index = index; }
578
579 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
580
581 // find local field, returns true if found
582 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
583 // find field in direct superinterfaces, returns the interface in which the field is defined
584 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
585 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
586 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
587 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
588 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
589
590 // find a non-static or static field given its offset within the class.
591 bool contains_field_offset(int offset);
592
593 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
594 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
595
596 private:
597 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
598
599 public:
600 static void disable_method_binary_search() {
601 _disable_method_binary_search = true;
602 }
603
604 // find a local method (returns NULL if not found)
605 Method* find_method(const Symbol* name, const Symbol* signature) const;
606 static Method* find_method(const Array<Method*>* methods,
607 const Symbol* name,
608 const Symbol* signature);
609
610 // find a local method, but skip static methods
611 Method* find_instance_method(const Symbol* name, const Symbol* signature,
612 PrivateLookupMode private_mode = find_private) const;
613 static Method* find_instance_method(const Array<Method*>* methods,
614 const Symbol* name,
615 const Symbol* signature,
616 PrivateLookupMode private_mode = find_private);
617
618 // find a local method (returns NULL if not found)
619 Method* find_local_method(const Symbol* name,
620 const Symbol* signature,
621 OverpassLookupMode overpass_mode,
622 StaticLookupMode static_mode,
623 PrivateLookupMode private_mode) const;
624
625 // find a local method from given methods array (returns NULL if not found)
626 static Method* find_local_method(const Array<Method*>* methods,
627 const Symbol* name,
628 const Symbol* signature,
629 OverpassLookupMode overpass_mode,
630 StaticLookupMode static_mode,
631 PrivateLookupMode private_mode);
632
633 // find a local method index in methods or default_methods (returns -1 if not found)
634 static int find_method_index(const Array<Method*>* methods,
635 const Symbol* name,
636 const Symbol* signature,
637 OverpassLookupMode overpass_mode,
638 StaticLookupMode static_mode,
639 PrivateLookupMode private_mode);
640
641 // lookup operation (returns NULL if not found)
642 Method* uncached_lookup_method(const Symbol* name,
643 const Symbol* signature,
644 OverpassLookupMode overpass_mode,
645 PrivateLookupMode private_mode = find_private) const;
646
647 // lookup a method in all the interfaces that this class implements
648 // (returns NULL if not found)
649 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
650
651 // lookup a method in local defaults then in all interfaces
652 // (returns NULL if not found)
653 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
654
655 // Find method indices by name. If a method with the specified name is
656 // found the index to the first method is returned, and 'end' is filled in
657 // with the index of first non-name-matching method. If no method is found
658 // -1 is returned.
659 int find_method_by_name(const Symbol* name, int* end) const;
660 static int find_method_by_name(const Array<Method*>* methods,
661 const Symbol* name, int* end);
662
663 // constant pool
664 ConstantPool* constants() const { return _constants; }
665 void set_constants(ConstantPool* c) { _constants = c; }
666
667 // protection domain
668 oop protection_domain() const;
669
670 // signers
671 objArrayOop signers() const;
672
673 // host class
674 InstanceKlass* unsafe_anonymous_host() const {
675 InstanceKlass** hk = adr_unsafe_anonymous_host();
676 if (hk == NULL) {
677 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
678 return NULL;
679 } else {
680 assert(*hk != NULL, "host klass should always be set if the address is not null");
681 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
682 return *hk;
683 }
684 }
685 void set_unsafe_anonymous_host(const InstanceKlass* host) {
686 assert(is_unsafe_anonymous(), "not unsafe anonymous");
687 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
688 assert(addr != NULL, "no reversed space");
689 if (addr != NULL) {
690 *addr = host;
691 }
692 }
693 bool is_unsafe_anonymous() const {
694 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
695 }
696 void set_is_unsafe_anonymous(bool value) {
697 if (value) {
698 _misc_flags |= _misc_is_unsafe_anonymous;
699 } else {
700 _misc_flags &= ~_misc_is_unsafe_anonymous;
701 }
702 }
703
704 bool is_contended() const {
705 return (_misc_flags & _misc_is_contended) != 0;
706 }
707 void set_is_contended(bool value) {
708 if (value) {
709 _misc_flags |= _misc_is_contended;
710 } else {
711 _misc_flags &= ~_misc_is_contended;
712 }
713 }
714
715 // source file name
716 Symbol* source_file_name() const {
717 return (_source_file_name_index == 0) ?
718 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
719 }
720 u2 source_file_name_index() const {
721 return _source_file_name_index;
722 }
723 void set_source_file_name_index(u2 sourcefile_index) {
724 _source_file_name_index = sourcefile_index;
725 }
726
727 // minor and major version numbers of class file
728 u2 minor_version() const { return _minor_version; }
729 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
730 u2 major_version() const { return _major_version; }
731 void set_major_version(u2 major_version) { _major_version = major_version; }
732
733 // source debug extension
734 const char* source_debug_extension() const { return _source_debug_extension; }
735 void set_source_debug_extension(const char* array, int length);
736
737 // symbol unloading support (refcount already added)
738 Symbol* array_name() { return _array_name; }
739 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
740
741 // nonstatic oop-map blocks
742 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
743 return oop_map_count * OopMapBlock::size_in_words();
744 }
745 unsigned int nonstatic_oop_map_count() const {
746 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
747 }
748 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
749 void set_nonstatic_oop_map_size(int words) {
750 _nonstatic_oop_map_size = words;
751 }
752
753 bool has_contended_annotations() const {
754 return ((_misc_flags & _misc_has_contended_annotations) != 0);
755 }
756 void set_has_contended_annotations(bool value) {
757 if (value) {
758 _misc_flags |= _misc_has_contended_annotations;
759 } else {
760 _misc_flags &= ~_misc_has_contended_annotations;
761 }
762 }
763
764 #if INCLUDE_JVMTI
765 // Redefinition locking. Class can only be redefined by one thread at a time.
766 bool is_being_redefined() const {
767 return ((_misc_flags & _misc_is_being_redefined) != 0);
768 }
769 void set_is_being_redefined(bool value) {
770 if (value) {
771 _misc_flags |= _misc_is_being_redefined;
772 } else {
773 _misc_flags &= ~_misc_is_being_redefined;
774 }
775 }
776
777 // RedefineClasses() support for previous versions:
778 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
779 void purge_previous_version_list();
780
781 InstanceKlass* previous_versions() const { return _previous_versions; }
782 #else
783 InstanceKlass* previous_versions() const { return NULL; }
784 #endif
785
786 InstanceKlass* get_klass_version(int version) {
787 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
788 if (ik->constants()->version() == version) {
789 return ik;
790 }
791 }
792 return NULL;
793 }
794
795 bool has_been_redefined() const {
796 return (_misc_flags & _misc_has_been_redefined) != 0;
797 }
798 void set_has_been_redefined() {
799 _misc_flags |= _misc_has_been_redefined;
800 }
801
802 bool has_passed_fingerprint_check() const {
803 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
804 }
805 void set_has_passed_fingerprint_check(bool b) {
806 if (b) {
807 _misc_flags |= _misc_has_passed_fingerprint_check;
808 } else {
809 _misc_flags &= ~_misc_has_passed_fingerprint_check;
810 }
811 }
812 bool supers_have_passed_fingerprint_checks();
813
814 static bool should_store_fingerprint(bool is_unsafe_anonymous);
815 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
816 bool has_stored_fingerprint() const;
817 uint64_t get_stored_fingerprint() const;
818 void store_fingerprint(uint64_t fingerprint);
819
820 bool is_scratch_class() const {
821 return (_misc_flags & _misc_is_scratch_class) != 0;
822 }
823
824 void set_is_scratch_class() {
825 _misc_flags |= _misc_is_scratch_class;
826 }
827
828 bool has_resolved_methods() const {
829 return (_misc_flags & _misc_has_resolved_methods) != 0;
830 }
831
832 void set_has_resolved_methods() {
833 _misc_flags |= _misc_has_resolved_methods;
834 }
835 private:
836
837 void set_kind(unsigned kind) {
838 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
839 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
840 unsigned flags = _misc_flags & ~fmask;
841 _misc_flags = (flags | (kind << _misc_kind_field_pos));
842 }
843
844 bool is_kind(unsigned desired) const {
845 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
846 return kind == desired;
847 }
848
849 public:
850
851 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
852 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
853 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
854 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
855 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
856
857 #if INCLUDE_JVMTI
858
859 void init_previous_versions() {
860 _previous_versions = NULL;
861 }
862
863 private:
864 static bool _has_previous_versions;
865 public:
866 static void purge_previous_versions(InstanceKlass* ik) {
867 if (ik->has_been_redefined()) {
868 ik->purge_previous_version_list();
869 }
870 }
871
872 static bool has_previous_versions_and_reset();
873 static bool has_previous_versions() { return _has_previous_versions; }
874
875 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
876 void set_cached_class_file(JvmtiCachedClassFileData *data) {
877 _cached_class_file = data;
878 }
879 JvmtiCachedClassFileData * get_cached_class_file();
880 jint get_cached_class_file_len();
881 unsigned char * get_cached_class_file_bytes();
882
883 // JVMTI: Support for caching of field indices, types, and offsets
884 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
885 _jvmti_cached_class_field_map = descriptor;
886 }
887 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
888 return _jvmti_cached_class_field_map;
889 }
890 #else // INCLUDE_JVMTI
891
892 static void purge_previous_versions(InstanceKlass* ik) { return; };
893 static bool has_previous_versions_and_reset() { return false; }
894
895 void set_cached_class_file(JvmtiCachedClassFileData *data) {
896 assert(data == NULL, "unexpected call with JVMTI disabled");
897 }
898 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
899
900 #endif // INCLUDE_JVMTI
901
902 bool has_nonstatic_concrete_methods() const {
903 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
904 }
905 void set_has_nonstatic_concrete_methods(bool b) {
906 if (b) {
907 _misc_flags |= _misc_has_nonstatic_concrete_methods;
908 } else {
909 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
910 }
911 }
912
913 bool declares_nonstatic_concrete_methods() const {
914 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
915 }
916 void set_declares_nonstatic_concrete_methods(bool b) {
917 if (b) {
918 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
919 } else {
920 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
921 }
922 }
923
924 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
925 inline u2 next_method_idnum();
926 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
927
928 // generics support
929 Symbol* generic_signature() const {
930 return (_generic_signature_index == 0) ?
931 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
932 }
933 u2 generic_signature_index() const {
934 return _generic_signature_index;
935 }
936 void set_generic_signature_index(u2 sig_index) {
937 _generic_signature_index = sig_index;
938 }
939
940 u2 enclosing_method_data(int offset) const;
941 u2 enclosing_method_class_index() const {
942 return enclosing_method_data(enclosing_method_class_index_offset);
943 }
944 u2 enclosing_method_method_index() {
945 return enclosing_method_data(enclosing_method_method_index_offset);
946 }
947 void set_enclosing_method_indices(u2 class_index,
948 u2 method_index);
949
950 // jmethodID support
951 jmethodID get_jmethod_id(const methodHandle& method_h);
952 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
953 jmethodID new_id, jmethodID* new_jmeths,
954 jmethodID* to_dealloc_id_p,
955 jmethodID** to_dealloc_jmeths_p);
956 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
957 size_t *length_p, jmethodID* id_p);
958 void ensure_space_for_methodids(int start_offset = 0);
959 jmethodID jmethod_id_or_null(Method* method);
960
961 // annotations support
962 Annotations* annotations() const { return _annotations; }
963 void set_annotations(Annotations* anno) { _annotations = anno; }
964
965 AnnotationArray* class_annotations() const {
966 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
967 }
968 Array<AnnotationArray*>* fields_annotations() const {
969 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
970 }
971 AnnotationArray* class_type_annotations() const {
972 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
973 }
974 Array<AnnotationArray*>* fields_type_annotations() const {
975 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
976 }
977 // allocation
978 instanceOop allocate_instance(TRAPS);
979
980 // additional member function to return a handle
981 instanceHandle allocate_instance_handle(TRAPS);
982
983 objArrayOop allocate_objArray(int n, int length, TRAPS);
984 // Helper function
985 static instanceOop register_finalizer(instanceOop i, TRAPS);
986
987 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
988 // if not, throw either an Error or an Exception.
989 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
990
991 // initialization
992 void call_class_initializer(TRAPS);
993 void set_initialization_state_and_notify(ClassState state, TRAPS);
994
995 // OopMapCache support
996 OopMapCache* oop_map_cache() { return _oop_map_cache; }
997 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
998 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
999
1000 // JNI identifier support (for static fields - for jni performance)
1001 JNIid* jni_ids() { return _jni_ids; }
1002 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
1003 JNIid* jni_id_for(int offset);
1004
1005 // maintenance of deoptimization dependencies
1006 inline DependencyContext dependencies();
1007 int mark_dependent_nmethods(KlassDepChange& changes);
1008 void add_dependent_nmethod(nmethod* nm);
1009 void remove_dependent_nmethod(nmethod* nm);
1010 void clean_dependency_context();
1011
1012 // On-stack replacement support
1013 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1014 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1015 void add_osr_nmethod(nmethod* n);
1016 bool remove_osr_nmethod(nmethod* n);
1017 int mark_osr_nmethods(const Method* m);
1018 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1019
1020 #if INCLUDE_JVMTI
1021 // Breakpoint support (see methods on Method* for details)
1022 BreakpointInfo* breakpoints() const { return _breakpoints; };
1023 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1024 #endif
1025
1026 // support for stub routines
1027 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1028 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1029 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1030
1031 // subclass/subinterface checks
1032 bool implements_interface(Klass* k) const;
1033 bool is_same_or_direct_interface(Klass* k) const;
1034
1035 #ifdef ASSERT
1036 // check whether this class or one of its superclasses was redefined
1037 bool has_redefined_this_or_super() const;
1038 #endif
1039
1040 // Access to the implementor of an interface.
1041 Klass* implementor() const;
1042 void set_implementor(Klass* k);
1043 int nof_implementors() const;
1044 void add_implementor(Klass* k); // k is a new class that implements this interface
1045 void init_implementor(); // initialize
1046
1047 // link this class into the implementors list of every interface it implements
1048 void process_interfaces(Thread *thread);
1049
1050 // virtual operations from Klass
1051 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1052 Array<InstanceKlass*>* transitive_interfaces);
1053 bool can_be_primary_super_slow() const;
1054 int oop_size(oop obj) const { return size_helper(); }
1055 // slow because it's a virtual call and used for verifying the layout_helper.
1056 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1057 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1058
1059 // Iterators
1060 void do_local_static_fields(FieldClosure* cl);
1061 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1062 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1063
1064 void methods_do(void f(Method* method));
1065 void array_klasses_do(void f(Klass* k));
1066 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1067
1068 static InstanceKlass* cast(Klass* k) {
1069 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1070 }
1071
1072 static const InstanceKlass* cast(const Klass* k) {
1073 assert(k != NULL, "k should not be null");
1074 assert(k->is_instance_klass(), "cast to InstanceKlass");
1075 return static_cast<const InstanceKlass*>(k);
1076 }
1077
1078 virtual InstanceKlass* java_super() const {
1079 return (super() == NULL) ? NULL : cast(super());
1080 }
1081
1082 // Sizing (in words)
1083 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1084
1085 static int size(int vtable_length, int itable_length,
1086 int nonstatic_oop_map_size,
1087 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1088 return align_metadata_size(header_size() +
1089 vtable_length +
1090 itable_length +
1091 nonstatic_oop_map_size +
1092 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1093 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1094 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1095 }
1096 int size() const { return size(vtable_length(),
1097 itable_length(),
1098 nonstatic_oop_map_size(),
1099 is_interface(),
1100 is_unsafe_anonymous(),
1101 has_stored_fingerprint());
1102 }
1103
1104 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1105 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1106
1107 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1108
1109 oop static_field_base_raw() { return java_mirror(); }
1110
1111 OopMapBlock* start_of_nonstatic_oop_maps() const {
1112 return (OopMapBlock*)(start_of_itable() + itable_length());
1113 }
1114
1115 Klass** end_of_nonstatic_oop_maps() const {
1116 return (Klass**)(start_of_nonstatic_oop_maps() +
1117 nonstatic_oop_map_count());
1118 }
1119
1120 Klass* volatile* adr_implementor() const {
1121 if (is_interface()) {
1122 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1123 } else {
1124 return NULL;
1125 }
1126 };
1127
1128 InstanceKlass** adr_unsafe_anonymous_host() const {
1129 if (is_unsafe_anonymous()) {
1130 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1131 if (adr_impl != NULL) {
1132 return adr_impl + 1;
1133 } else {
1134 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1135 }
1136 } else {
1137 return NULL;
1138 }
1139 }
1140
1141 address adr_fingerprint() const {
1142 if (has_stored_fingerprint()) {
1143 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1144 if (adr_host != NULL) {
1145 return (address)(adr_host + 1);
1146 }
1147
1148 Klass* volatile* adr_impl = adr_implementor();
1149 if (adr_impl != NULL) {
1150 return (address)(adr_impl + 1);
1151 }
1152
1153 return (address)end_of_nonstatic_oop_maps();
1154 } else {
1155 return NULL;
1156 }
1157 }
1158
1159 // Use this to return the size of an instance in heap words:
1160 int size_helper() const {
1161 return layout_helper_to_size_helper(layout_helper());
1162 }
1163
1164 // This bit is initialized in classFileParser.cpp.
1165 // It is false under any of the following conditions:
1166 // - the class is abstract (including any interface)
1167 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1168 // - the class size is larger than FastAllocateSizeLimit
1169 // - the class is java/lang/Class, which cannot be allocated directly
1170 bool can_be_fastpath_allocated() const {
1171 return !layout_helper_needs_slow_path(layout_helper());
1172 }
1173
1174 // Java itable
1175 klassItable itable() const; // return klassItable wrapper
1176 Method* method_at_itable(Klass* holder, int index, TRAPS);
1177
1178 #if INCLUDE_JVMTI
1179 void adjust_default_methods(bool* trace_name_printed);
1180 #endif // INCLUDE_JVMTI
1181
1182 void clean_weak_instanceklass_links();
1183 private:
1184 void clean_implementors_list();
1185 void clean_method_data();
1186
1187 public:
1188 // Explicit metaspace deallocation of fields
1189 // For RedefineClasses and class file parsing errors, we need to deallocate
1190 // instanceKlasses and the metadata they point to.
1191 void deallocate_contents(ClassLoaderData* loader_data);
1192 static void deallocate_methods(ClassLoaderData* loader_data,
1193 Array<Method*>* methods);
1194 void static deallocate_interfaces(ClassLoaderData* loader_data,
1195 const Klass* super_klass,
1196 Array<InstanceKlass*>* local_interfaces,
1197 Array<InstanceKlass*>* transitive_interfaces);
1198 void static deallocate_record_components(ClassLoaderData* loader_data,
1199 Array<RecordComponent*>* record_component);
1200
1201 // The constant pool is on stack if any of the methods are executing or
1202 // referenced by handles.
1203 bool on_stack() const { return _constants->on_stack(); }
1204
1205 // callbacks for actions during class unloading
1206 static void unload_class(InstanceKlass* ik);
1207 static void release_C_heap_structures(InstanceKlass* ik);
1208
1209 // Naming
1210 const char* signature_name() const;
1211 static Symbol* package_from_name(const Symbol* name, TRAPS);
1212
1213 // Oop fields (and metadata) iterators
1214 //
1215 // The InstanceKlass iterators also visits the Object's klass.
1216
1217 // Forward iteration
1218 public:
1219 // Iterate over all oop fields in the oop maps.
1220 template <typename T, class OopClosureType>
1221 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1222
1223 // Iterate over all oop fields and metadata.
1224 template <typename T, class OopClosureType>
1225 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1226
1227 // Iterate over all oop fields in one oop map.
1228 template <typename T, class OopClosureType>
1229 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1230
1231
1232 // Reverse iteration
1233 // Iterate over all oop fields and metadata.
1234 template <typename T, class OopClosureType>
1235 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1236
1237 private:
1238 // Iterate over all oop fields in the oop maps.
1239 template <typename T, class OopClosureType>
1240 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1241
1242 // Iterate over all oop fields in one oop map.
1243 template <typename T, class OopClosureType>
1244 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1245
1246
1247 // Bounded range iteration
1248 public:
1249 // Iterate over all oop fields in the oop maps.
1250 template <typename T, class OopClosureType>
1251 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1252
1253 // Iterate over all oop fields and metadata.
1254 template <typename T, class OopClosureType>
1255 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1256
1257 private:
1258 // Iterate over all oop fields in one oop map.
1259 template <typename T, class OopClosureType>
1260 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1261
1262
1263 public:
1264 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1265
1266 public:
1267 void set_in_error_state() {
1268 assert(DumpSharedSpaces, "only call this when dumping archive");
1269 _init_state = initialization_error;
1270 }
1271 bool check_sharing_error_state();
1272
1273 private:
1274 // initialization state
1275 void set_init_state(ClassState state);
1276 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1277 void set_init_thread(Thread *thread) { _init_thread = thread; }
1278
1279 // The RedefineClasses() API can cause new method idnums to be needed
1280 // which will cause the caches to grow. Safety requires different
1281 // cache management logic if the caches can grow instead of just
1282 // going from NULL to non-NULL.
1283 bool idnum_can_increment() const { return has_been_redefined(); }
1284 inline jmethodID* methods_jmethod_ids_acquire() const;
1285 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1286
1287 // Lock during initialization
1288 public:
1289 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1290 // Must be one per class and it has to be a VM internal object so java code
1291 // cannot lock it (like the mirror).
1292 // It has to be an object not a Mutex because it's held through java calls.
1293 oop init_lock() const;
1294 private:
1295 void fence_and_clear_init_lock();
1296
1297 bool link_class_impl (TRAPS);
1298 bool verify_code (TRAPS);
1299 void initialize_impl (TRAPS);
1300 void initialize_super_interfaces (TRAPS);
1301 void eager_initialize_impl ();
1302 /* jni_id_for_impl for jfieldID only */
1303 JNIid* jni_id_for_impl (int offset);
1304
1305 // Returns the array class for the n'th dimension
1306 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1307
1308 // Returns the array class with this class as element type
1309 Klass* array_klass_impl(bool or_null, TRAPS);
1310
1311 // find a local method (returns NULL if not found)
1312 Method* find_method_impl(const Symbol* name,
1313 const Symbol* signature,
1314 OverpassLookupMode overpass_mode,
1315 StaticLookupMode static_mode,
1316 PrivateLookupMode private_mode) const;
1317
1318 static Method* find_method_impl(const Array<Method*>* methods,
1319 const Symbol* name,
1320 const Symbol* signature,
1321 OverpassLookupMode overpass_mode,
1322 StaticLookupMode static_mode,
1323 PrivateLookupMode private_mode);
1324
1325 // Free CHeap allocated fields.
1326 void release_C_heap_structures();
1327
1328 #if INCLUDE_JVMTI
1329 // RedefineClasses support
1330 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1331 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1332 #endif
1333 public:
1334 // CDS support - remove and restore oops from metadata. Oops are not shared.
1335 virtual void remove_unshareable_info();
1336 virtual void remove_java_mirror();
1337 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1338
1339 // jvm support
1340 jint compute_modifier_flags(TRAPS) const;
1341
1342 public:
1343 // JVMTI support
1344 jint jvmti_class_status() const;
1345
1346 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1347
1348 public:
1349 // Printing
1350 #ifndef PRODUCT
1351 void print_on(outputStream* st) const;
1352 #endif
1353 void print_value_on(outputStream* st) const;
1354
1355 void oop_print_value_on(oop obj, outputStream* st);
1356
1357 #ifndef PRODUCT
1358 void oop_print_on (oop obj, outputStream* st);
1359
1360 void print_dependent_nmethods(bool verbose = false);
1361 bool is_dependent_nmethod(nmethod* nm);
1362 bool verify_itable_index(int index);
1363 #endif
1364
1365 const char* internal_name() const;
1366
1367 // Verification
1368 void verify_on(outputStream* st);
1369
1370 void oop_verify_on(oop obj, outputStream* st);
1371
1372 // Logging
1373 void print_class_load_logging(ClassLoaderData* loader_data,
1374 const char* module_name,
1375 const ClassFileStream* cfs) const;
1376 };
1377
1378 // for adding methods
1379 // UNSET_IDNUM return means no more ids available
1380 inline u2 InstanceKlass::next_method_idnum() {
1381 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1382 return ConstMethod::UNSET_IDNUM; // no more ids available
1383 } else {
1384 return _idnum_allocated_count++;
1385 }
1386 }
1387
1388
1389 /* JNIid class for jfieldIDs only */
1390 class JNIid: public CHeapObj<mtClass> {
1391 friend class VMStructs;
1392 private:
1393 Klass* _holder;
1394 JNIid* _next;
1395 int _offset;
1396 #ifdef ASSERT
1397 bool _is_static_field_id;
1398 #endif
1399
1400 public:
1401 // Accessors
1402 Klass* holder() const { return _holder; }
1403 int offset() const { return _offset; }
1404 JNIid* next() { return _next; }
1405 // Constructor
1406 JNIid(Klass* holder, int offset, JNIid* next);
1407 // Identifier lookup
1408 JNIid* find(int offset);
1409
1410 bool find_local_field(fieldDescriptor* fd) {
1411 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1412 }
1413
1414 static void deallocate(JNIid* id);
1415 // Debugging
1416 #ifdef ASSERT
1417 bool is_static_field_id() const { return _is_static_field_id; }
1418 void set_is_static_field_id() { _is_static_field_id = true; }
1419 #endif
1420 void verify(Klass* holder);
1421 };
1422
1423 // An iterator that's used to access the inner classes indices in the
1424 // InstanceKlass::_inner_classes array.
1425 class InnerClassesIterator : public StackObj {
1426 private:
1427 Array<jushort>* _inner_classes;
1428 int _length;
1429 int _idx;
1430 public:
1431
1432 InnerClassesIterator(const InstanceKlass* k) {
1433 _inner_classes = k->inner_classes();
1434 if (k->inner_classes() != NULL) {
1435 _length = _inner_classes->length();
1436 // The inner class array's length should be the multiple of
1437 // inner_class_next_offset if it only contains the InnerClasses
1438 // attribute data, or it should be
1439 // n*inner_class_next_offset+enclosing_method_attribute_size
1440 // if it also contains the EnclosingMethod data.
1441 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1442 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1443 "just checking");
1444 // Remove the enclosing_method portion if exists.
1445 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1446 _length -= InstanceKlass::enclosing_method_attribute_size;
1447 }
1448 } else {
1449 _length = 0;
1450 }
1451 _idx = 0;
1452 }
1453
1454 int length() const {
1455 return _length;
1456 }
1457
1458 void next() {
1459 _idx += InstanceKlass::inner_class_next_offset;
1460 }
1461
1462 bool done() const {
1463 return (_idx >= _length);
1464 }
1465
1466 u2 inner_class_info_index() const {
1467 return _inner_classes->at(
1468 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1469 }
1470
1471 void set_inner_class_info_index(u2 index) {
1472 _inner_classes->at_put(
1473 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1474 }
1475
1476 u2 outer_class_info_index() const {
1477 return _inner_classes->at(
1478 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1479 }
1480
1481 void set_outer_class_info_index(u2 index) {
1482 _inner_classes->at_put(
1483 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1484 }
1485
1486 u2 inner_name_index() const {
1487 return _inner_classes->at(
1488 _idx + InstanceKlass::inner_class_inner_name_offset);
1489 }
1490
1491 void set_inner_name_index(u2 index) {
1492 _inner_classes->at_put(
1493 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1494 }
1495
1496 u2 inner_access_flags() const {
1497 return _inner_classes->at(
1498 _idx + InstanceKlass::inner_class_access_flags_offset);
1499 }
1500 };
1501
1502 #endif // SHARE_OOPS_INSTANCEKLASS_HPP