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