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 shared_loader_type_bits() const {
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 // The three BUILTIN class loader types
357 bool is_shared_boot_class() const {
358 return (_misc_flags & _misc_is_shared_boot_class) != 0;
359 }
360 bool is_shared_platform_class() const {
361 return (_misc_flags & _misc_is_shared_platform_class) != 0;
362 }
363 bool is_shared_app_class() const {
364 return (_misc_flags & _misc_is_shared_app_class) != 0;
365 }
366 // The UNREGISTERED class loader type
367 bool is_shared_unregistered_class() const {
368 return (_misc_flags & shared_loader_type_bits()) == 0;
369 }
370
371 void clear_shared_class_loader_type() {
372 _misc_flags &= ~shared_loader_type_bits();
373 }
374
375 void set_shared_class_loader_type(s2 loader_type);
376
377 bool has_nonstatic_fields() const {
378 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
379 }
380 void set_has_nonstatic_fields(bool b) {
381 if (b) {
382 _misc_flags |= _misc_has_nonstatic_fields;
383 } else {
384 _misc_flags &= ~_misc_has_nonstatic_fields;
385 }
386 }
387
388 // field sizes
389 int nonstatic_field_size() const { return _nonstatic_field_size; }
390 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
391
392 int static_field_size() const { return _static_field_size; }
393 void set_static_field_size(int size) { _static_field_size = size; }
394
395 int static_oop_field_count() const { return (int)_static_oop_field_count; }
396 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
397
398 // Java itable
399 int itable_length() const { return _itable_len; }
400 void set_itable_length(int len) { _itable_len = len; }
401
402 // array klasses
403 Klass* array_klasses() const { return _array_klasses; }
404 inline Klass* array_klasses_acquire() const; // load with acquire semantics
405 void set_array_klasses(Klass* k) { _array_klasses = k; }
406 inline void release_set_array_klasses(Klass* k); // store with release semantics
407
408 // methods
409 Array<Method*>* methods() const { return _methods; }
410 void set_methods(Array<Method*>* a) { _methods = a; }
411 Method* method_with_idnum(int idnum);
412 Method* method_with_orig_idnum(int idnum);
413 Method* method_with_orig_idnum(int idnum, int version);
414
415 // method ordering
416 Array<int>* method_ordering() const { return _method_ordering; }
417 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
418 void copy_method_ordering(const intArray* m, TRAPS);
419
420 // default_methods
421 Array<Method*>* default_methods() const { return _default_methods; }
422 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
423
424 // default method vtable_indices
425 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
426 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
427 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
428
429 // interfaces
430 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
431 void set_local_interfaces(Array<InstanceKlass*>* a) {
432 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
433 _local_interfaces = a; }
434
435 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
436 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
437 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
438 _transitive_interfaces = a;
439 }
440
441 private:
442 friend class fieldDescriptor;
443 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
444
445 public:
446 int field_offset (int index) const { return field(index)->offset(); }
447 int field_access_flags(int index) const { return field(index)->access_flags(); }
448 Symbol* field_name (int index) const { return field(index)->name(constants()); }
449 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
450
451 // Number of Java declared fields
452 int java_fields_count() const { return (int)_java_fields_count; }
453
454 Array<u2>* fields() const { return _fields; }
455 void set_fields(Array<u2>* f, u2 java_fields_count) {
456 guarantee(_fields == NULL || f == NULL, "Just checking");
457 _fields = f;
458 _java_fields_count = java_fields_count;
459 }
460
461 // inner classes
462 Array<u2>* inner_classes() const { return _inner_classes; }
463 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
464
465 // nest members
466 Array<u2>* nest_members() const { return _nest_members; }
467 void set_nest_members(Array<u2>* m) { _nest_members = m; }
468
469 // nest-host index
470 jushort nest_host_index() const { return _nest_host_index; }
471 void set_nest_host_index(u2 i) { _nest_host_index = i; }
472 // dynamic nest member support
473 void set_nest_host(InstanceKlass* host, TRAPS);
474
475 // record components
476 Array<RecordComponent*>* record_components() const { return _record_components; }
477 void set_record_components(Array<RecordComponent*>* record_components) {
478 _record_components = record_components;
479 }
480 bool is_record() const { return _record_components != NULL; }
481
482 private:
483 // Called to verify that k is a member of this nest - does not look at k's nest-host
484 bool has_nest_member(InstanceKlass* k, TRAPS) const;
485
486 public:
487 // Returns nest-host class, resolving and validating it if needed
488 // Returns NULL if an exception occurs during loading, or validation fails
489 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
490 // Check if this klass is a nestmate of k - resolves this nest-host and k's
491 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
492 // Returns the runtime nest host. If static nest host is valid, set the nest host;
493 // otherwise this klass is the host of a nest; all errors are ignored
494 InstanceKlass* runtime_nest_host(TRAPS);
495
496 enum InnerClassAttributeOffset {
497 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
498 inner_class_inner_class_info_offset = 0,
499 inner_class_outer_class_info_offset = 1,
500 inner_class_inner_name_offset = 2,
501 inner_class_access_flags_offset = 3,
502 inner_class_next_offset = 4
503 };
504
505 enum EnclosingMethodAttributeOffset {
506 enclosing_method_class_index_offset = 0,
507 enclosing_method_method_index_offset = 1,
508 enclosing_method_attribute_size = 2
509 };
510
511 // method override check
512 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
513
514 // package
515 PackageEntry* package() const { return _package_entry; }
516 ModuleEntry* module() const;
517 bool in_unnamed_package() const { return (_package_entry == NULL); }
518 void set_package(PackageEntry* p) { _package_entry = p; }
519 void set_package(ClassLoaderData* loader_data, TRAPS);
520 bool is_same_class_package(const Klass* class2) const;
521 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
522
523 // find an enclosing class
524 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
525
526 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
527 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
528
529 private:
530 // Check prohibited package ("java/" only loadable by boot or platform loaders)
531 static void check_prohibited_package(Symbol* class_name,
532 ClassLoaderData* loader_data,
533 TRAPS);
534 public:
535 // initialization state
536 bool is_loaded() const { return _init_state >= loaded; }
537 bool is_linked() const { return _init_state >= linked; }
538 bool is_initialized() const { return _init_state == fully_initialized; }
539 bool is_not_initialized() const { return _init_state < being_initialized; }
540 bool is_being_initialized() const { return _init_state == being_initialized; }
541 bool is_in_error_state() const { return _init_state == initialization_error; }
542 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
543 ClassState init_state() { return (ClassState)_init_state; }
544 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
545
546 // defineClass specified verification
547 bool should_verify_class() const {
548 return (_misc_flags & _misc_should_verify_class) != 0;
549 }
550 void set_should_verify_class(bool value) {
551 if (value) {
552 _misc_flags |= _misc_should_verify_class;
553 } else {
554 _misc_flags &= ~_misc_should_verify_class;
555 }
556 }
557
558 // marking
559 bool is_marked_dependent() const { return _is_marked_dependent; }
560 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
561
562 // initialization (virtuals from Klass)
563 bool should_be_initialized() const; // means that initialize should be called
564 void initialize(TRAPS);
565 void link_class(TRAPS);
566 bool link_class_or_fail(TRAPS); // returns false on failure
567 void rewrite_class(TRAPS);
568 void link_methods(TRAPS);
569 Method* class_initializer() const;
570
571 // set the class to initialized if no static initializer is present
572 void eager_initialize(Thread *thread);
573
574 // reference type
575 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
576 void set_reference_type(ReferenceType t) {
577 assert(t == (u1)t, "overflow");
578 _reference_type = (u1)t;
579 }
580
581 // this class cp index
582 u2 this_class_index() const { return _this_class_index; }
583 void set_this_class_index(u2 index) { _this_class_index = index; }
584
585 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
586
587 // find local field, returns true if found
588 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
589 // find field in direct superinterfaces, returns the interface in which the field is defined
590 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
591 // find field 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, fieldDescriptor* fd) const;
593 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
594 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
595
596 // find a non-static or static field given its offset within the class.
597 bool contains_field_offset(int offset);
598
599 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
600 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
601
602 private:
603 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
604
605 public:
606 static void disable_method_binary_search() {
607 _disable_method_binary_search = true;
608 }
609
610 // find a local method (returns NULL if not found)
611 Method* find_method(const Symbol* name, const Symbol* signature) const;
612 static Method* find_method(const Array<Method*>* methods,
613 const Symbol* name,
614 const Symbol* signature);
615
616 // find a local method, but skip static methods
617 Method* find_instance_method(const Symbol* name, const Symbol* signature,
618 PrivateLookupMode private_mode = find_private) const;
619 static Method* find_instance_method(const Array<Method*>* methods,
620 const Symbol* name,
621 const Symbol* signature,
622 PrivateLookupMode private_mode = find_private);
623
624 // find a local method (returns NULL if not found)
625 Method* find_local_method(const Symbol* name,
626 const Symbol* signature,
627 OverpassLookupMode overpass_mode,
628 StaticLookupMode static_mode,
629 PrivateLookupMode private_mode) const;
630
631 // find a local method from given methods array (returns NULL if not found)
632 static Method* find_local_method(const Array<Method*>* methods,
633 const Symbol* name,
634 const Symbol* signature,
635 OverpassLookupMode overpass_mode,
636 StaticLookupMode static_mode,
637 PrivateLookupMode private_mode);
638
639 // find a local method index in methods or default_methods (returns -1 if not found)
640 static int find_method_index(const Array<Method*>* methods,
641 const Symbol* name,
642 const Symbol* signature,
643 OverpassLookupMode overpass_mode,
644 StaticLookupMode static_mode,
645 PrivateLookupMode private_mode);
646
647 // lookup operation (returns NULL if not found)
648 Method* uncached_lookup_method(const Symbol* name,
649 const Symbol* signature,
650 OverpassLookupMode overpass_mode,
651 PrivateLookupMode private_mode = find_private) const;
652
653 // lookup a method in all the interfaces that this class implements
654 // (returns NULL if not found)
655 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
656
657 // lookup a method in local defaults then in all interfaces
658 // (returns NULL if not found)
659 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
660
661 // Find method indices by name. If a method with the specified name is
662 // found the index to the first method is returned, and 'end' is filled in
663 // with the index of first non-name-matching method. If no method is found
664 // -1 is returned.
665 int find_method_by_name(const Symbol* name, int* end) const;
666 static int find_method_by_name(const Array<Method*>* methods,
667 const Symbol* name, int* end);
668
669 // constant pool
670 ConstantPool* constants() const { return _constants; }
671 void set_constants(ConstantPool* c) { _constants = c; }
672
673 // protection domain
674 oop protection_domain() const;
675
676 // signers
677 objArrayOop signers() const;
678
679 // host class
680 InstanceKlass* unsafe_anonymous_host() const {
681 InstanceKlass** hk = adr_unsafe_anonymous_host();
682 if (hk == NULL) {
683 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
684 return NULL;
685 } else {
686 assert(*hk != NULL, "host klass should always be set if the address is not null");
687 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
688 return *hk;
689 }
690 }
691 void set_unsafe_anonymous_host(const InstanceKlass* host) {
692 assert(is_unsafe_anonymous(), "not unsafe anonymous");
693 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
694 assert(addr != NULL, "no reversed space");
695 if (addr != NULL) {
696 *addr = host;
697 }
698 }
699 bool is_unsafe_anonymous() const {
700 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
701 }
702 void set_is_unsafe_anonymous(bool value) {
703 if (value) {
704 _misc_flags |= _misc_is_unsafe_anonymous;
705 } else {
706 _misc_flags &= ~_misc_is_unsafe_anonymous;
707 }
708 }
709
710 bool is_contended() const {
711 return (_misc_flags & _misc_is_contended) != 0;
712 }
713 void set_is_contended(bool value) {
714 if (value) {
715 _misc_flags |= _misc_is_contended;
716 } else {
717 _misc_flags &= ~_misc_is_contended;
718 }
719 }
720
721 // source file name
722 Symbol* source_file_name() const {
723 return (_source_file_name_index == 0) ?
724 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
725 }
726 u2 source_file_name_index() const {
727 return _source_file_name_index;
728 }
729 void set_source_file_name_index(u2 sourcefile_index) {
730 _source_file_name_index = sourcefile_index;
731 }
732
733 // minor and major version numbers of class file
734 u2 minor_version() const { return _minor_version; }
735 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
736 u2 major_version() const { return _major_version; }
737 void set_major_version(u2 major_version) { _major_version = major_version; }
738
739 // source debug extension
740 const char* source_debug_extension() const { return _source_debug_extension; }
741 void set_source_debug_extension(const char* array, int length);
742
743 // symbol unloading support (refcount already added)
744 Symbol* array_name() { return _array_name; }
745 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
746
747 // nonstatic oop-map blocks
748 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
749 return oop_map_count * OopMapBlock::size_in_words();
750 }
751 unsigned int nonstatic_oop_map_count() const {
752 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
753 }
754 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
755 void set_nonstatic_oop_map_size(int words) {
756 _nonstatic_oop_map_size = words;
757 }
758
759 bool has_contended_annotations() const {
760 return ((_misc_flags & _misc_has_contended_annotations) != 0);
761 }
762 void set_has_contended_annotations(bool value) {
763 if (value) {
764 _misc_flags |= _misc_has_contended_annotations;
765 } else {
766 _misc_flags &= ~_misc_has_contended_annotations;
767 }
768 }
769
770 #if INCLUDE_JVMTI
771 // Redefinition locking. Class can only be redefined by one thread at a time.
772 bool is_being_redefined() const {
773 return ((_misc_flags & _misc_is_being_redefined) != 0);
774 }
775 void set_is_being_redefined(bool value) {
776 if (value) {
777 _misc_flags |= _misc_is_being_redefined;
778 } else {
779 _misc_flags &= ~_misc_is_being_redefined;
780 }
781 }
782
783 // RedefineClasses() support for previous versions:
784 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
785 void purge_previous_version_list();
786
787 InstanceKlass* previous_versions() const { return _previous_versions; }
788 #else
789 InstanceKlass* previous_versions() const { return NULL; }
790 #endif
791
792 InstanceKlass* get_klass_version(int version) {
793 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
794 if (ik->constants()->version() == version) {
795 return ik;
796 }
797 }
798 return NULL;
799 }
800
801 bool has_been_redefined() const {
802 return (_misc_flags & _misc_has_been_redefined) != 0;
803 }
804 void set_has_been_redefined() {
805 _misc_flags |= _misc_has_been_redefined;
806 }
807
808 bool has_passed_fingerprint_check() const {
809 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
810 }
811 void set_has_passed_fingerprint_check(bool b) {
812 if (b) {
813 _misc_flags |= _misc_has_passed_fingerprint_check;
814 } else {
815 _misc_flags &= ~_misc_has_passed_fingerprint_check;
816 }
817 }
818 bool supers_have_passed_fingerprint_checks();
819
820 static bool should_store_fingerprint(bool is_hidden_or_anonymous);
821 bool should_store_fingerprint() const { return should_store_fingerprint(is_hidden() || is_unsafe_anonymous()); }
822 bool has_stored_fingerprint() const;
823 uint64_t get_stored_fingerprint() const;
824 void store_fingerprint(uint64_t fingerprint);
825
826 bool is_scratch_class() const {
827 return (_misc_flags & _misc_is_scratch_class) != 0;
828 }
829
830 void set_is_scratch_class() {
831 _misc_flags |= _misc_is_scratch_class;
832 }
833
834 bool has_resolved_methods() const {
835 return (_misc_flags & _misc_has_resolved_methods) != 0;
836 }
837
838 void set_has_resolved_methods() {
839 _misc_flags |= _misc_has_resolved_methods;
840 }
841 private:
842
843 void set_kind(unsigned kind) {
844 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
845 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
846 unsigned flags = _misc_flags & ~fmask;
847 _misc_flags = (flags | (kind << _misc_kind_field_pos));
848 }
849
850 bool is_kind(unsigned desired) const {
851 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
852 return kind == desired;
853 }
854
855 public:
856
857 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
858 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
859 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
860 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
861 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
862
863 #if INCLUDE_JVMTI
864
865 void init_previous_versions() {
866 _previous_versions = NULL;
867 }
868
869 private:
870 static bool _has_previous_versions;
871 public:
872 static void purge_previous_versions(InstanceKlass* ik) {
873 if (ik->has_been_redefined()) {
874 ik->purge_previous_version_list();
875 }
876 }
877
878 static bool has_previous_versions_and_reset();
879 static bool has_previous_versions() { return _has_previous_versions; }
880
881 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
882 void set_cached_class_file(JvmtiCachedClassFileData *data) {
883 _cached_class_file = data;
884 }
885 JvmtiCachedClassFileData * get_cached_class_file();
886 jint get_cached_class_file_len();
887 unsigned char * get_cached_class_file_bytes();
888
889 // JVMTI: Support for caching of field indices, types, and offsets
890 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
891 _jvmti_cached_class_field_map = descriptor;
892 }
893 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
894 return _jvmti_cached_class_field_map;
895 }
896 #else // INCLUDE_JVMTI
897
898 static void purge_previous_versions(InstanceKlass* ik) { return; };
899 static bool has_previous_versions_and_reset() { return false; }
900
901 void set_cached_class_file(JvmtiCachedClassFileData *data) {
902 assert(data == NULL, "unexpected call with JVMTI disabled");
903 }
904 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
905
906 #endif // INCLUDE_JVMTI
907
908 bool has_nonstatic_concrete_methods() const {
909 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
910 }
911 void set_has_nonstatic_concrete_methods(bool b) {
912 if (b) {
913 _misc_flags |= _misc_has_nonstatic_concrete_methods;
914 } else {
915 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
916 }
917 }
918
919 bool declares_nonstatic_concrete_methods() const {
920 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
921 }
922 void set_declares_nonstatic_concrete_methods(bool b) {
923 if (b) {
924 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
925 } else {
926 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
927 }
928 }
929
930 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
931 inline u2 next_method_idnum();
932 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
933
934 // generics support
935 Symbol* generic_signature() const {
936 return (_generic_signature_index == 0) ?
937 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
938 }
939 u2 generic_signature_index() const {
940 return _generic_signature_index;
941 }
942 void set_generic_signature_index(u2 sig_index) {
943 _generic_signature_index = sig_index;
944 }
945
946 u2 enclosing_method_data(int offset) const;
947 u2 enclosing_method_class_index() const {
948 return enclosing_method_data(enclosing_method_class_index_offset);
949 }
950 u2 enclosing_method_method_index() {
951 return enclosing_method_data(enclosing_method_method_index_offset);
952 }
953 void set_enclosing_method_indices(u2 class_index,
954 u2 method_index);
955
956 // jmethodID support
957 jmethodID get_jmethod_id(const methodHandle& method_h);
958 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
959 jmethodID new_id, jmethodID* new_jmeths,
960 jmethodID* to_dealloc_id_p,
961 jmethodID** to_dealloc_jmeths_p);
962 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
963 size_t *length_p, jmethodID* id_p);
964 void ensure_space_for_methodids(int start_offset = 0);
965 jmethodID jmethod_id_or_null(Method* method);
966
967 // annotations support
968 Annotations* annotations() const { return _annotations; }
969 void set_annotations(Annotations* anno) { _annotations = anno; }
970
971 AnnotationArray* class_annotations() const {
972 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
973 }
974 Array<AnnotationArray*>* fields_annotations() const {
975 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
976 }
977 AnnotationArray* class_type_annotations() const {
978 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
979 }
980 Array<AnnotationArray*>* fields_type_annotations() const {
981 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
982 }
983 // allocation
984 instanceOop allocate_instance(TRAPS);
985
986 // additional member function to return a handle
987 instanceHandle allocate_instance_handle(TRAPS);
988
989 objArrayOop allocate_objArray(int n, int length, TRAPS);
990 // Helper function
991 static instanceOop register_finalizer(instanceOop i, TRAPS);
992
993 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
994 // if not, throw either an Error or an Exception.
995 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
996
997 // initialization
998 void call_class_initializer(TRAPS);
999 void set_initialization_state_and_notify(ClassState state, TRAPS);
1000
1001 // OopMapCache support
1002 OopMapCache* oop_map_cache() { return _oop_map_cache; }
1003 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
1004 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
1005
1006 // JNI identifier support (for static fields - for jni performance)
1007 JNIid* jni_ids() { return _jni_ids; }
1008 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
1009 JNIid* jni_id_for(int offset);
1010
1011 // maintenance of deoptimization dependencies
1012 inline DependencyContext dependencies();
1013 int mark_dependent_nmethods(KlassDepChange& changes);
1014 void add_dependent_nmethod(nmethod* nm);
1015 void remove_dependent_nmethod(nmethod* nm);
1016 void clean_dependency_context();
1017
1018 // On-stack replacement support
1019 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1020 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1021 void add_osr_nmethod(nmethod* n);
1022 bool remove_osr_nmethod(nmethod* n);
1023 int mark_osr_nmethods(const Method* m);
1024 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1025
1026 #if INCLUDE_JVMTI
1027 // Breakpoint support (see methods on Method* for details)
1028 BreakpointInfo* breakpoints() const { return _breakpoints; };
1029 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1030 #endif
1031
1032 // support for stub routines
1033 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1034 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1035 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1036
1037 // subclass/subinterface checks
1038 bool implements_interface(Klass* k) const;
1039 bool is_same_or_direct_interface(Klass* k) const;
1040
1041 #ifdef ASSERT
1042 // check whether this class or one of its superclasses was redefined
1043 bool has_redefined_this_or_super() const;
1044 #endif
1045
1046 // Access to the implementor of an interface.
1047 Klass* implementor() const;
1048 void set_implementor(Klass* k);
1049 int nof_implementors() const;
1050 void add_implementor(Klass* k); // k is a new class that implements this interface
1051 void init_implementor(); // initialize
1052
1053 // link this class into the implementors list of every interface it implements
1054 void process_interfaces(Thread *thread);
1055
1056 // virtual operations from Klass
1057 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1058 Array<InstanceKlass*>* transitive_interfaces);
1059 bool can_be_primary_super_slow() const;
1060 int oop_size(oop obj) const { return size_helper(); }
1061 // slow because it's a virtual call and used for verifying the layout_helper.
1062 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1063 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1064
1065 // Iterators
1066 void do_local_static_fields(FieldClosure* cl);
1067 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1068 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1069
1070 void methods_do(void f(Method* method));
1071 void array_klasses_do(void f(Klass* k));
1072 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1073
1074 static InstanceKlass* cast(Klass* k) {
1075 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1076 }
1077
1078 static const InstanceKlass* cast(const Klass* k) {
1079 assert(k != NULL, "k should not be null");
1080 assert(k->is_instance_klass(), "cast to InstanceKlass");
1081 return static_cast<const InstanceKlass*>(k);
1082 }
1083
1084 virtual InstanceKlass* java_super() const {
1085 return (super() == NULL) ? NULL : cast(super());
1086 }
1087
1088 // Sizing (in words)
1089 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1090
1091 static int size(int vtable_length, int itable_length,
1092 int nonstatic_oop_map_size,
1093 bool is_interface, bool is_hidden_or_anonymous, bool has_stored_fingerprint) {
1094 return align_metadata_size(header_size() +
1095 vtable_length +
1096 itable_length +
1097 nonstatic_oop_map_size +
1098 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1099 (is_hidden_or_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1100 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1101 }
1102 int size() const { return size(vtable_length(),
1103 itable_length(),
1104 nonstatic_oop_map_size(),
1105 is_interface(),
1106 (is_hidden() || is_unsafe_anonymous()),
1107 has_stored_fingerprint());
1108 }
1109
1110 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1111 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1112
1113 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1114
1115 oop static_field_base_raw() { return java_mirror(); }
1116
1117 OopMapBlock* start_of_nonstatic_oop_maps() const {
1118 return (OopMapBlock*)(start_of_itable() + itable_length());
1119 }
1120
1121 Klass** end_of_nonstatic_oop_maps() const {
1122 return (Klass**)(start_of_nonstatic_oop_maps() +
1123 nonstatic_oop_map_count());
1124 }
1125
1126 Klass* volatile* adr_implementor() const {
1127 if (is_interface()) {
1128 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1129 } else {
1130 return NULL;
1131 }
1132 };
1133
1134 InstanceKlass** adr_unsafe_anonymous_host() const {
1135 if (is_unsafe_anonymous()) {
1136 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1137 if (adr_impl != NULL) {
1138 return adr_impl + 1;
1139 } else {
1140 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1141 }
1142 } else {
1143 return NULL;
1144 }
1145 }
1146
1147 address adr_fingerprint() const {
1148 if (has_stored_fingerprint()) {
1149 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1150 if (adr_host != NULL) {
1151 return (address)(adr_host + 1);
1152 }
1153
1154 Klass* volatile* adr_impl = adr_implementor();
1155 if (adr_impl != NULL) {
1156 return (address)(adr_impl + 1);
1157 }
1158
1159 return (address)end_of_nonstatic_oop_maps();
1160 } else {
1161 return NULL;
1162 }
1163 }
1164
1165 // Use this to return the size of an instance in heap words:
1166 int size_helper() const {
1167 return layout_helper_to_size_helper(layout_helper());
1168 }
1169
1170 // This bit is initialized in classFileParser.cpp.
1171 // It is false under any of the following conditions:
1172 // - the class is abstract (including any interface)
1173 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1174 // - the class size is larger than FastAllocateSizeLimit
1175 // - the class is java/lang/Class, which cannot be allocated directly
1176 bool can_be_fastpath_allocated() const {
1177 return !layout_helper_needs_slow_path(layout_helper());
1178 }
1179
1180 // Java itable
1181 klassItable itable() const; // return klassItable wrapper
1182 Method* method_at_itable(Klass* holder, int index, TRAPS);
1183
1184 #if INCLUDE_JVMTI
1185 void adjust_default_methods(bool* trace_name_printed);
1186 #endif // INCLUDE_JVMTI
1187
1188 void clean_weak_instanceklass_links();
1189 private:
1190 void clean_implementors_list();
1191 void clean_method_data();
1192
1193 public:
1194 // Explicit metaspace deallocation of fields
1195 // For RedefineClasses and class file parsing errors, we need to deallocate
1196 // instanceKlasses and the metadata they point to.
1197 void deallocate_contents(ClassLoaderData* loader_data);
1198 static void deallocate_methods(ClassLoaderData* loader_data,
1199 Array<Method*>* methods);
1200 void static deallocate_interfaces(ClassLoaderData* loader_data,
1201 const Klass* super_klass,
1202 Array<InstanceKlass*>* local_interfaces,
1203 Array<InstanceKlass*>* transitive_interfaces);
1204 void static deallocate_record_components(ClassLoaderData* loader_data,
1205 Array<RecordComponent*>* record_component);
1206
1207 // The constant pool is on stack if any of the methods are executing or
1208 // referenced by handles.
1209 bool on_stack() const { return _constants->on_stack(); }
1210
1211 // callbacks for actions during class unloading
1212 static void unload_class(InstanceKlass* ik);
1213 static void release_C_heap_structures(InstanceKlass* ik);
1214
1215 // Naming
1216 const char* signature_name() const;
1217 static Symbol* package_from_name(const Symbol* name, TRAPS);
1218
1219 // Oop fields (and metadata) iterators
1220 //
1221 // The InstanceKlass iterators also visits the Object's klass.
1222
1223 // Forward iteration
1224 public:
1225 // Iterate over all oop fields in the oop maps.
1226 template <typename T, class OopClosureType>
1227 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1228
1229 // Iterate over all oop fields and metadata.
1230 template <typename T, class OopClosureType>
1231 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1232
1233 // Iterate over all oop fields in one oop map.
1234 template <typename T, class OopClosureType>
1235 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1236
1237
1238 // Reverse iteration
1239 // Iterate over all oop fields and metadata.
1240 template <typename T, class OopClosureType>
1241 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1242
1243 private:
1244 // Iterate over all oop fields in the oop maps.
1245 template <typename T, class OopClosureType>
1246 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1247
1248 // Iterate over all oop fields in one oop map.
1249 template <typename T, class OopClosureType>
1250 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1251
1252
1253 // Bounded range iteration
1254 public:
1255 // Iterate over all oop fields in the oop maps.
1256 template <typename T, class OopClosureType>
1257 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1258
1259 // Iterate over all oop fields and metadata.
1260 template <typename T, class OopClosureType>
1261 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1262
1263 private:
1264 // Iterate over all oop fields in one oop map.
1265 template <typename T, class OopClosureType>
1266 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1267
1268
1269 public:
1270 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1271
1272 public:
1273 void set_in_error_state() {
1274 assert(DumpSharedSpaces, "only call this when dumping archive");
1275 _init_state = initialization_error;
1276 }
1277
1278 private:
1279 // initialization state
1280 void set_init_state(ClassState state);
1281 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1282 void set_init_thread(Thread *thread) { _init_thread = thread; }
1283
1284 // The RedefineClasses() API can cause new method idnums to be needed
1285 // which will cause the caches to grow. Safety requires different
1286 // cache management logic if the caches can grow instead of just
1287 // going from NULL to non-NULL.
1288 bool idnum_can_increment() const { return has_been_redefined(); }
1289 inline jmethodID* methods_jmethod_ids_acquire() const;
1290 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1291
1292 // Lock during initialization
1293 public:
1294 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1295 // Must be one per class and it has to be a VM internal object so java code
1296 // cannot lock it (like the mirror).
1297 // It has to be an object not a Mutex because it's held through java calls.
1298 oop init_lock() const;
1299 private:
1300 void fence_and_clear_init_lock();
1301
1302 bool link_class_impl (TRAPS);
1303 bool verify_code (TRAPS);
1304 void initialize_impl (TRAPS);
1305 void initialize_super_interfaces (TRAPS);
1306 void eager_initialize_impl ();
1307 /* jni_id_for_impl for jfieldID only */
1308 JNIid* jni_id_for_impl (int offset);
1309
1310 // Returns the array class for the n'th dimension
1311 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1312
1313 // Returns the array class with this class as element type
1314 Klass* array_klass_impl(bool or_null, TRAPS);
1315
1316 // find a local method (returns NULL if not found)
1317 Method* find_method_impl(const Symbol* name,
1318 const Symbol* signature,
1319 OverpassLookupMode overpass_mode,
1320 StaticLookupMode static_mode,
1321 PrivateLookupMode private_mode) const;
1322
1323 static Method* find_method_impl(const Array<Method*>* methods,
1324 const Symbol* name,
1325 const Symbol* signature,
1326 OverpassLookupMode overpass_mode,
1327 StaticLookupMode static_mode,
1328 PrivateLookupMode private_mode);
1329
1330 // Free CHeap allocated fields.
1331 void release_C_heap_structures();
1332
1333 #if INCLUDE_JVMTI
1334 // RedefineClasses support
1335 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1336 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1337 #endif
1338 public:
1339 // CDS support - remove and restore oops from metadata. Oops are not shared.
1340 virtual void remove_unshareable_info();
1341 virtual void remove_java_mirror();
1342 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1343
1344 // jvm support
1345 jint compute_modifier_flags(TRAPS) const;
1346
1347 public:
1348 // JVMTI support
1349 jint jvmti_class_status() const;
1350
1351 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1352
1353 public:
1354 // Printing
1355 #ifndef PRODUCT
1356 void print_on(outputStream* st) const;
1357 #endif
1358 void print_value_on(outputStream* st) const;
1359
1360 void oop_print_value_on(oop obj, outputStream* st);
1361
1362 #ifndef PRODUCT
1363 void oop_print_on (oop obj, outputStream* st);
1364
1365 void print_dependent_nmethods(bool verbose = false);
1366 bool is_dependent_nmethod(nmethod* nm);
1367 bool verify_itable_index(int index);
1368 #endif
1369
1370 const char* internal_name() const;
1371
1372 // Verification
1373 void verify_on(outputStream* st);
1374
1375 void oop_verify_on(oop obj, outputStream* st);
1376
1377 // Logging
1378 void print_class_load_logging(ClassLoaderData* loader_data,
1379 const char* module_name,
1380 const ClassFileStream* cfs) const;
1381 };
1382
1383 // for adding methods
1384 // UNSET_IDNUM return means no more ids available
1385 inline u2 InstanceKlass::next_method_idnum() {
1386 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1387 return ConstMethod::UNSET_IDNUM; // no more ids available
1388 } else {
1389 return _idnum_allocated_count++;
1390 }
1391 }
1392
1393
1394 /* JNIid class for jfieldIDs only */
1395 class JNIid: public CHeapObj<mtClass> {
1396 friend class VMStructs;
1397 private:
1398 Klass* _holder;
1399 JNIid* _next;
1400 int _offset;
1401 #ifdef ASSERT
1402 bool _is_static_field_id;
1403 #endif
1404
1405 public:
1406 // Accessors
1407 Klass* holder() const { return _holder; }
1408 int offset() const { return _offset; }
1409 JNIid* next() { return _next; }
1410 // Constructor
1411 JNIid(Klass* holder, int offset, JNIid* next);
1412 // Identifier lookup
1413 JNIid* find(int offset);
1414
1415 bool find_local_field(fieldDescriptor* fd) {
1416 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1417 }
1418
1419 static void deallocate(JNIid* id);
1420 // Debugging
1421 #ifdef ASSERT
1422 bool is_static_field_id() const { return _is_static_field_id; }
1423 void set_is_static_field_id() { _is_static_field_id = true; }
1424 #endif
1425 void verify(Klass* holder);
1426 };
1427
1428 // An iterator that's used to access the inner classes indices in the
1429 // InstanceKlass::_inner_classes array.
1430 class InnerClassesIterator : public StackObj {
1431 private:
1432 Array<jushort>* _inner_classes;
1433 int _length;
1434 int _idx;
1435 public:
1436
1437 InnerClassesIterator(const InstanceKlass* k) {
1438 _inner_classes = k->inner_classes();
1439 if (k->inner_classes() != NULL) {
1440 _length = _inner_classes->length();
1441 // The inner class array's length should be the multiple of
1442 // inner_class_next_offset if it only contains the InnerClasses
1443 // attribute data, or it should be
1444 // n*inner_class_next_offset+enclosing_method_attribute_size
1445 // if it also contains the EnclosingMethod data.
1446 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1447 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1448 "just checking");
1449 // Remove the enclosing_method portion if exists.
1450 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1451 _length -= InstanceKlass::enclosing_method_attribute_size;
1452 }
1453 } else {
1454 _length = 0;
1455 }
1456 _idx = 0;
1457 }
1458
1459 int length() const {
1460 return _length;
1461 }
1462
1463 void next() {
1464 _idx += InstanceKlass::inner_class_next_offset;
1465 }
1466
1467 bool done() const {
1468 return (_idx >= _length);
1469 }
1470
1471 u2 inner_class_info_index() const {
1472 return _inner_classes->at(
1473 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1474 }
1475
1476 void set_inner_class_info_index(u2 index) {
1477 _inner_classes->at_put(
1478 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1479 }
1480
1481 u2 outer_class_info_index() const {
1482 return _inner_classes->at(
1483 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1484 }
1485
1486 void set_outer_class_info_index(u2 index) {
1487 _inner_classes->at_put(
1488 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1489 }
1490
1491 u2 inner_name_index() const {
1492 return _inner_classes->at(
1493 _idx + InstanceKlass::inner_class_inner_name_offset);
1494 }
1495
1496 void set_inner_name_index(u2 index) {
1497 _inner_classes->at_put(
1498 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1499 }
1500
1501 u2 inner_access_flags() const {
1502 return _inner_classes->at(
1503 _idx + InstanceKlass::inner_class_access_flags_offset);
1504 }
1505 };
1506
1507 #endif // SHARE_OOPS_INSTANCEKLASS_HPP