1 /*
2 * Copyright (c) 1997, 2019, 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 "code/vmreg.hpp"
30 #include "memory/referenceType.hpp"
31 #include "oops/annotations.hpp"
32 #include "oops/constMethod.hpp"
33 #include "oops/fieldInfo.hpp"
34 #include "oops/instanceOop.hpp"
35 #include "oops/klassVtable.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/align.hpp"
40 #include "utilities/macros.hpp"
41 #if INCLUDE_JFR
42 #include "jfr/support/jfrKlassExtension.hpp"
43 #endif
44
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 // [EMBEDDED ValueKlassFixedBlock] only if is a ValueKlass instance
58
59
60 // forward declaration for class -- see below for definition
61 #if INCLUDE_JVMTI
62 class BreakpointInfo;
63 #endif
64 class ClassFileParser;
65 class ClassFileStream;
66 class KlassDepChange;
67 class DependencyContext;
68 class fieldDescriptor;
69 class jniIdMapBase;
70 class JNIid;
71 class JvmtiCachedClassFieldMap;
72 class nmethodBucket;
73 class OopMapCache;
74 class BufferedValueTypeBlob;
75 class InterpreterOopMap;
76 class PackageEntry;
77 class ModuleEntry;
78
79 // This is used in iterators below.
80 class FieldClosure: public StackObj {
81 public:
82 virtual void do_field(fieldDescriptor* fd) = 0;
83 };
84
85 #ifndef PRODUCT
86 // Print fields.
87 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
88 class FieldPrinter: public FieldClosure {
89 oop _obj;
90 outputStream* _st;
91 public:
92 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
93 void do_field(fieldDescriptor* fd);
94 };
95 #endif // !PRODUCT
96
97 // Describes where oops are located in instances of this klass.
98 class OopMapBlock {
99 public:
100 // Byte offset of the first oop mapped by this block.
101 int offset() const { return _offset; }
102 void set_offset(int offset) { _offset = offset; }
103
104 // Number of oops in this block.
105 uint count() const { return _count; }
106 void set_count(uint count) { _count = count; }
107
108 void increment_count(int diff) { _count += diff; }
109
110 int offset_span() const { return _count * heapOopSize; }
111
112 int end_offset() const {
113 return offset() + offset_span();
114 }
115
116 bool is_contiguous(int another_offset) const {
117 return another_offset == end_offset();
118 }
119
120 // sizeof(OopMapBlock) in words.
121 static const int size_in_words() {
122 return align_up((int)sizeof(OopMapBlock), wordSize) >>
123 LogBytesPerWord;
124 }
125
126 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
127 return a->offset() - b->offset();
128 }
129
130 private:
131 int _offset;
132 uint _count;
133 };
134
135 struct JvmtiCachedClassFileData;
136
137 class SigEntry;
138
139 class ValueKlassFixedBlock {
140 Array<SigEntry>** _extended_sig;
141 Array<VMRegPair>** _return_regs;
142 address* _pack_handler;
143 address* _unpack_handler;
144 int* _default_value_offset;
145 Klass** _value_array_klass;
146 int _alignment;
147 int _first_field_offset;
148 int _exact_size_in_bytes;
149
150 friend class ValueKlass;
151 };
152
153 class ValueTypes {
154 public:
155 u2 _class_info_index;
156 Symbol* _class_name;
157 };
158
159 class InstanceKlass: public Klass {
160 friend class VMStructs;
161 friend class JVMCIVMStructs;
162 friend class ClassFileParser;
163 friend class CompileReplay;
164
165 public:
166 static const KlassID ID = InstanceKlassID;
167
168 protected:
169 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
170
171 public:
172 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
173
174 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
175 // of the class loading & initialization procedure, and the use of the states.
176 enum ClassState {
177 allocated, // allocated (but not yet linked)
178 loaded, // loaded and inserted in class hierarchy (but not linked yet)
179 linked, // successfully linked/verified (but not initialized yet)
180 being_initialized, // currently running class initializer
181 fully_initialized, // initialized (successful final state)
182 initialization_error // error happened during initialization
183 };
184
185 private:
186 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
187
188 protected:
189 // If you add a new field that points to any metaspace object, you
190 // must add this field to InstanceKlass::metaspace_pointers_do().
191
192 // Annotations for this class
193 Annotations* _annotations;
194 // Package this class is defined in
195 PackageEntry* _package_entry;
196 // Array classes holding elements of this class.
197 Klass* volatile _array_klasses;
198 // Constant pool for this class.
199 ConstantPool* _constants;
200 // The InnerClasses attribute and EnclosingMethod attribute. The
201 // _inner_classes is an array of shorts. If the class has InnerClasses
202 // attribute, then the _inner_classes array begins with 4-tuples of shorts
203 // [inner_class_info_index, outer_class_info_index,
204 // inner_name_index, inner_class_access_flags] for the InnerClasses
205 // attribute. If the EnclosingMethod attribute exists, it occupies the
206 // last two shorts [class_index, method_index] of the array. If only
207 // the InnerClasses attribute exists, the _inner_classes array length is
208 // number_of_inner_classes * 4. If the class has both InnerClasses
209 // and EnclosingMethod attributes the _inner_classes array length is
210 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
211 Array<jushort>* _inner_classes;
212
213 // The NestMembers attribute. An array of shorts, where each is a
214 // class info index for the class that is a nest member. This data
215 // has not been validated.
216 Array<jushort>* _nest_members;
217
218 // The NestHost attribute. The class info index for the class
219 // that is the nest-host of this class. This data has not been validated.
220 jushort _nest_host_index;
221
222 // Resolved nest-host klass: either true nest-host or self if we are not nested.
223 // By always being set it makes nest-member access checks simpler.
224 InstanceKlass* _nest_host;
225
226 Array<ValueTypes>* _value_types;
227
228 // the source debug extension for this klass, NULL if not specified.
229 // Specified as UTF-8 string without terminating zero byte in the classfile,
230 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
231 const char* _source_debug_extension;
232 // Array name derived from this class which needs unreferencing
233 // if this class is unloaded.
234 Symbol* _array_name;
235
236 // Number of heapOopSize words used by non-static fields in this klass
237 // (including inherited fields but after header_size()).
238 int _nonstatic_field_size;
239 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
240 // Constant pool index to the utf8 entry of the Generic signature,
241 // or 0 if none.
242 u2 _generic_signature_index;
243 // Constant pool index to the utf8 entry for the name of source file
244 // containing this klass, 0 if not specified.
245 u2 _source_file_name_index;
246 u2 _static_oop_field_count;// number of static oop fields in this klass
247 u2 _java_fields_count; // The number of declared Java fields
248 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
249
250 int _itable_len; // length of Java itable (in words)
251 // _is_marked_dependent can be set concurrently, thus cannot be part of the
252 // _misc_flags.
253 bool _is_marked_dependent; // used for marking during flushing and deoptimization
254
255 public:
256 enum {
257 _extra_is_being_redefined = 1 << 0, // used for locking redefinition
258 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class
259 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty
260 _extra_is_bufferable = 1 << 3 // value can be buffered out side of the Java heap
261 };
262
263 protected:
264 u1 _extra_flags;
265
266 // The low three bits of _misc_flags contains the kind field.
267 // This can be used to quickly discriminate among the five kinds of
268 // InstanceKlass.
269
270 static const unsigned _misc_kind_field_size = 3;
271 static const unsigned _misc_kind_field_pos = 0;
272 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
273
274 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
275 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
276 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
277 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
278 static const unsigned _misc_kind_value_type = 4; // ValueKlass
279
280 // Start after _misc_kind field.
281 enum {
282 _misc_rewritten = 1 << 3, // methods rewritten.
283 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops
284 _misc_should_verify_class = 1 << 5, // allow caching of preverification
285 _misc_is_unsafe_anonymous = 1 << 6, // has embedded _unsafe_anonymous_host field
286 _misc_is_contended = 1 << 7, // marked with contended annotation
287 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods
288 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods
289 _misc_has_been_redefined = 1 << 10, // class has been redefined
290 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its
291 // code source was found to be matching the value recorded by AOT.
292 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class
293 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader
294 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader
295 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader
296 // u2 _misc_flags full (see _extra_flags)
297 };
298 u2 loader_type_bits() {
299 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
300 }
301 u2 _misc_flags;
302 u2 _minor_version; // minor version number of class file
303 u2 _major_version; // major version number of class file
304 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
305 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
306 JNIid* _jni_ids; // First JNI identifier for static fields in this class
307 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
308 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
309 uint64_t volatile _dep_context_last_cleaned;
310 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
311 #if INCLUDE_JVMTI
312 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
313 // Linked instanceKlasses of previous versions
314 InstanceKlass* _previous_versions;
315 // JVMTI fields can be moved to their own structure - see 6315920
316 // JVMTI: cached class file, before retransformable agent modified it in CFLH
317 JvmtiCachedClassFileData* _cached_class_file;
318 #endif
319
320 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
321
322 // Class states are defined as ClassState (see above).
323 // Place the _init_state here to utilize the unused 2-byte after
324 // _idnum_allocated_count.
325 u1 _init_state; // state of class
326 u1 _reference_type; // reference type
327
328 u2 _this_class_index; // constant pool entry
329 #if INCLUDE_JVMTI
330 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
331 #endif
332
333 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
334
335 // Method array.
336 Array<Method*>* _methods;
337 // Default Method Array, concrete methods inherited from interfaces
338 Array<Method*>* _default_methods;
339 // Interfaces (InstanceKlass*s) this class declares locally to implement.
340 Array<InstanceKlass*>* _local_interfaces;
341 // Interfaces (InstanceKlass*s) this class implements transitively.
342 Array<InstanceKlass*>* _transitive_interfaces;
343 // Int array containing the original order of method in the class file (for JVMTI).
344 Array<int>* _method_ordering;
345 // Int array containing the vtable_indices for default_methods
346 // offset matches _default_methods offset
347 Array<int>* _default_vtable_indices;
348
349 // Instance and static variable information, starts with 6-tuples of shorts
350 // [access, name index, sig index, initval index, low_offset, high_offset]
351 // for all fields, followed by the generic signature data at the end of
352 // the array. Only fields with generic signature attributes have the generic
353 // signature data set in the array. The fields array looks like following:
354 //
355 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
356 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
357 // ...
358 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
359 // [generic signature index]
360 // [generic signature index]
361 // ...
362 Array<u2>* _fields;
363
364 const ValueKlassFixedBlock* _adr_valueklass_fixed_block;
365
366 // embedded Java vtable follows here
367 // embedded Java itables follows here
368 // embedded static fields follows here
369 // embedded nonstatic oop-map blocks follows here
370 // embedded implementor of this interface follows here
371 // The embedded implementor only exists if the current klass is an
372 // iterface. The possible values of the implementor fall into following
373 // three cases:
374 // NULL: no implementor.
375 // A Klass* that's not itself: one implementor.
376 // Itself: more than one implementors.
377 // embedded unsafe_anonymous_host klass follows here
378 // The embedded host klass only exists in an unsafe anonymous class for
379 // dynamic language support (JSR 292 enabled). The host class grants
380 // its access privileges to this class also. The host class is either
381 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
382 // or an anonymous class loaded through normal classloading does not
383 // have this embedded field.
384 //
385
386 friend class SystemDictionary;
387
388 public:
389 u2 loader_type() {
390 return _misc_flags & loader_type_bits();
391 }
392
393 bool is_shared_boot_class() const {
394 return (_misc_flags & _misc_is_shared_boot_class) != 0;
395 }
396 bool is_shared_platform_class() const {
397 return (_misc_flags & _misc_is_shared_platform_class) != 0;
398 }
399 bool is_shared_app_class() const {
400 return (_misc_flags & _misc_is_shared_app_class) != 0;
401 }
402
403 void clear_class_loader_type() {
404 _misc_flags &= ~loader_type_bits();
405 }
406
407 void set_class_loader_type(s2 loader_type);
408
409 bool has_nonstatic_fields() const {
410 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
411 }
412 void set_has_nonstatic_fields(bool b) {
413 if (b) {
414 _misc_flags |= _misc_has_nonstatic_fields;
415 } else {
416 _misc_flags &= ~_misc_has_nonstatic_fields;
417 }
418 }
419
420 bool has_value_fields() const {
421 return (_extra_flags & _extra_has_value_fields) != 0;
422 }
423 void set_has_value_fields() {
424 _extra_flags |= _extra_has_value_fields;
425 }
426
427 // field sizes
428 int nonstatic_field_size() const { return _nonstatic_field_size; }
429 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
430
431 int static_field_size() const { return _static_field_size; }
432 void set_static_field_size(int size) { _static_field_size = size; }
433
434 int static_oop_field_count() const { return (int)_static_oop_field_count; }
435 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
436
437 // Java itable
438 int itable_length() const { return _itable_len; }
439 void set_itable_length(int len) { _itable_len = len; }
440
441 // array klasses
442 Klass* array_klasses() const { return _array_klasses; }
443 inline Klass* array_klasses_acquire() const; // load with acquire semantics
444 void set_array_klasses(Klass* k) { _array_klasses = k; }
445 inline void release_set_array_klasses(Klass* k); // store with release semantics
446
447 // methods
448 Array<Method*>* methods() const { return _methods; }
449 void set_methods(Array<Method*>* a) { _methods = a; }
450 Method* method_with_idnum(int idnum);
451 Method* method_with_orig_idnum(int idnum);
452 Method* method_with_orig_idnum(int idnum, int version);
453
454 // method ordering
455 Array<int>* method_ordering() const { return _method_ordering; }
456 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
457 void copy_method_ordering(const intArray* m, TRAPS);
458
459 // default_methods
460 Array<Method*>* default_methods() const { return _default_methods; }
461 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
462
463 // default method vtable_indices
464 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
465 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
466 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
467
468 // interfaces
469 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
470 void set_local_interfaces(Array<InstanceKlass*>* a) {
471 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
472 _local_interfaces = a; }
473
474 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
475 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
476 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
477 _transitive_interfaces = a;
478 }
479
480 private:
481 friend class fieldDescriptor;
482 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
483
484 public:
485 int field_offset (int index) const { return field(index)->offset(); }
486 int field_access_flags(int index) const { return field(index)->access_flags(); }
487 Symbol* field_name (int index) const { return field(index)->name(constants()); }
488 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
489 bool field_is_flattened(int index) const { return field(index)->is_flattened(); }
490
491 // Number of Java declared fields
492 int java_fields_count() const { return (int)_java_fields_count; }
493
494 Array<u2>* fields() const { return _fields; }
495 void set_fields(Array<u2>* f, u2 java_fields_count) {
496 guarantee(_fields == NULL || f == NULL, "Just checking");
497 _fields = f;
498 _java_fields_count = java_fields_count;
499 }
500
501 // inner classes
502 Array<u2>* inner_classes() const { return _inner_classes; }
503 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
504
505 // nest members
506 Array<u2>* nest_members() const { return _nest_members; }
507 void set_nest_members(Array<u2>* m) { _nest_members = m; }
508
509 // nest-host index
510 jushort nest_host_index() const { return _nest_host_index; }
511 void set_nest_host_index(u2 i) { _nest_host_index = i; }
512
513 private:
514 // Called to verify that k is a member of this nest - does not look at k's nest-host
515 bool has_nest_member(InstanceKlass* k, TRAPS) const;
516 public:
517 // Returns nest-host class, resolving and validating it if needed
518 // Returns NULL if an exception occurs during loading, or validation fails
519 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
520 // Check if this klass is a nestmate of k - resolves this nest-host and k's
521 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
522
523 enum InnerClassAttributeOffset {
524 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
525 inner_class_inner_class_info_offset = 0,
526 inner_class_outer_class_info_offset = 1,
527 inner_class_inner_name_offset = 2,
528 inner_class_access_flags_offset = 3,
529 inner_class_next_offset = 4
530 };
531
532 enum EnclosingMethodAttributeOffset {
533 enclosing_method_class_index_offset = 0,
534 enclosing_method_method_index_offset = 1,
535 enclosing_method_attribute_size = 2
536 };
537
538 // method override check
539 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
540
541 // package
542 PackageEntry* package() const { return _package_entry; }
543 ModuleEntry* module() const;
544 bool in_unnamed_package() const { return (_package_entry == NULL); }
545 void set_package(PackageEntry* p) { _package_entry = p; }
546 void set_package(ClassLoaderData* loader_data, TRAPS);
547 bool is_same_class_package(const Klass* class2) const;
548 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
549
550 // find an enclosing class
551 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
552
553 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
554 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
555
556 private:
557 // Check prohibited package ("java/" only loadable by boot or platform loaders)
558 static void check_prohibited_package(Symbol* class_name,
559 ClassLoaderData* loader_data,
560 TRAPS);
561 public:
562 // initialization state
563 bool is_loaded() const { return _init_state >= loaded; }
564 bool is_linked() const { return _init_state >= linked; }
565 bool is_initialized() const { return _init_state == fully_initialized; }
566 bool is_not_initialized() const { return _init_state < being_initialized; }
567 bool is_being_initialized() const { return _init_state == being_initialized; }
568 bool is_in_error_state() const { return _init_state == initialization_error; }
569 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
570 ClassState init_state() { return (ClassState)_init_state; }
571 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
572
573 // defineClass specified verification
574 bool should_verify_class() const {
575 return (_misc_flags & _misc_should_verify_class) != 0;
576 }
577 void set_should_verify_class(bool value) {
578 if (value) {
579 _misc_flags |= _misc_should_verify_class;
580 } else {
581 _misc_flags &= ~_misc_should_verify_class;
582 }
583 }
584
585 // marking
586 bool is_marked_dependent() const { return _is_marked_dependent; }
587 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
588
589 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); }
590
591 // initialization (virtuals from Klass)
592 bool should_be_initialized() const; // means that initialize should be called
593 void initialize(TRAPS);
594 void link_class(TRAPS);
595 bool link_class_or_fail(TRAPS); // returns false on failure
596 void rewrite_class(TRAPS);
597 void link_methods(TRAPS);
598 Method* class_initializer() const;
599
600 // set the class to initialized if no static initializer is present
601 void eager_initialize(Thread *thread);
602
603 // reference type
604 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
605 void set_reference_type(ReferenceType t) {
606 assert(t == (u1)t, "overflow");
607 _reference_type = (u1)t;
608 }
609
610 // this class cp index
611 u2 this_class_index() const { return _this_class_index; }
612 void set_this_class_index(u2 index) { _this_class_index = index; }
613
614 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
615
616 // find local field, returns true if found
617 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
618 // find field in direct superinterfaces, returns the interface in which the field is defined
619 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
620 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
621 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
622 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
623 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
624
625 // find a non-static or static field given its offset within the class.
626 bool contains_field_offset(int offset) {
627 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value());
628 }
629
630 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
631 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
632
633 // find a local method (returns NULL if not found)
634 Method* find_method(const Symbol* name, const Symbol* signature) const;
635 static Method* find_method(const Array<Method*>* methods,
636 const Symbol* name,
637 const Symbol* signature);
638
639 // find a local method, but skip static methods
640 Method* find_instance_method(const Symbol* name, const Symbol* signature,
641 PrivateLookupMode private_mode = find_private) const;
642 static Method* find_instance_method(const Array<Method*>* methods,
643 const Symbol* name,
644 const Symbol* signature,
645 PrivateLookupMode private_mode = find_private);
646
647 // find a local method (returns NULL if not found)
648 Method* find_local_method(const Symbol* name,
649 const Symbol* signature,
650 OverpassLookupMode overpass_mode,
651 StaticLookupMode static_mode,
652 PrivateLookupMode private_mode) const;
653
654 // find a local method from given methods array (returns NULL if not found)
655 static Method* find_local_method(const Array<Method*>* methods,
656 const Symbol* name,
657 const Symbol* signature,
658 OverpassLookupMode overpass_mode,
659 StaticLookupMode static_mode,
660 PrivateLookupMode private_mode);
661
662 // find a local method index in methods or default_methods (returns -1 if not found)
663 static int find_method_index(const Array<Method*>* methods,
664 const Symbol* name,
665 const Symbol* signature,
666 OverpassLookupMode overpass_mode,
667 StaticLookupMode static_mode,
668 PrivateLookupMode private_mode);
669
670 // lookup operation (returns NULL if not found)
671 Method* uncached_lookup_method(const Symbol* name,
672 const Symbol* signature,
673 OverpassLookupMode overpass_mode,
674 PrivateLookupMode private_mode = find_private) const;
675
676 // lookup a method in all the interfaces that this class implements
677 // (returns NULL if not found)
678 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
679
680 // lookup a method in local defaults then in all interfaces
681 // (returns NULL if not found)
682 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
683
684 // Find method indices by name. If a method with the specified name is
685 // found the index to the first method is returned, and 'end' is filled in
686 // with the index of first non-name-matching method. If no method is found
687 // -1 is returned.
688 int find_method_by_name(const Symbol* name, int* end) const;
689 static int find_method_by_name(const Array<Method*>* methods,
690 const Symbol* name, int* end);
691
692 // constant pool
693 ConstantPool* constants() const { return _constants; }
694 void set_constants(ConstantPool* c) { _constants = c; }
695
696 // protection domain
697 oop protection_domain() const;
698
699 // signers
700 objArrayOop signers() const;
701
702 // host class
703 InstanceKlass* unsafe_anonymous_host() const {
704 InstanceKlass** hk = adr_unsafe_anonymous_host();
705 if (hk == NULL) {
706 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
707 return NULL;
708 } else {
709 assert(*hk != NULL, "host klass should always be set if the address is not null");
710 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
711 return *hk;
712 }
713 }
714 void set_unsafe_anonymous_host(const InstanceKlass* host) {
715 assert(is_unsafe_anonymous(), "not unsafe anonymous");
716 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
717 assert(addr != NULL, "no reversed space");
718 if (addr != NULL) {
719 *addr = host;
720 }
721 }
722 bool is_unsafe_anonymous() const {
723 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
724 }
725 void set_is_unsafe_anonymous(bool value) {
726 if (value) {
727 _misc_flags |= _misc_is_unsafe_anonymous;
728 } else {
729 _misc_flags &= ~_misc_is_unsafe_anonymous;
730 }
731 }
732
733 bool is_contended() const {
734 return (_misc_flags & _misc_is_contended) != 0;
735 }
736 void set_is_contended(bool value) {
737 if (value) {
738 _misc_flags |= _misc_is_contended;
739 } else {
740 _misc_flags &= ~_misc_is_contended;
741 }
742 }
743
744 // source file name
745 Symbol* source_file_name() const {
746 return (_source_file_name_index == 0) ?
747 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
748 }
749 u2 source_file_name_index() const {
750 return _source_file_name_index;
751 }
752 void set_source_file_name_index(u2 sourcefile_index) {
753 _source_file_name_index = sourcefile_index;
754 }
755
756 // minor and major version numbers of class file
757 u2 minor_version() const { return _minor_version; }
758 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
759 u2 major_version() const { return _major_version; }
760 void set_major_version(u2 major_version) { _major_version = major_version; }
761
762 // source debug extension
763 const char* source_debug_extension() const { return _source_debug_extension; }
764 void set_source_debug_extension(const char* array, int length);
765
766 // symbol unloading support (refcount already added)
767 Symbol* array_name() { return _array_name; }
768 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
769
770 // nonstatic oop-map blocks
771 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
772 return oop_map_count * OopMapBlock::size_in_words();
773 }
774 unsigned int nonstatic_oop_map_count() const {
775 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
776 }
777 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
778 void set_nonstatic_oop_map_size(int words) {
779 _nonstatic_oop_map_size = words;
780 }
781
782 #if INCLUDE_JVMTI
783 // Redefinition locking. Class can only be redefined by one thread at a time.
784 bool is_being_redefined() const {
785 return (_extra_flags & _extra_is_being_redefined);
786 }
787 void set_is_being_redefined(bool value) {
788 if (value) {
789 _extra_flags |= _extra_is_being_redefined;
790 } else {
791 _extra_flags &= ~_extra_is_being_redefined;
792 }
793 }
794
795 // RedefineClasses() support for previous versions:
796 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
797 void purge_previous_version_list();
798
799 InstanceKlass* previous_versions() const { return _previous_versions; }
800 #else
801 InstanceKlass* previous_versions() const { return NULL; }
802 #endif
803
804 InstanceKlass* get_klass_version(int version) {
805 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
806 if (ik->constants()->version() == version) {
807 return ik;
808 }
809 }
810 return NULL;
811 }
812
813 bool has_been_redefined() const {
814 return (_misc_flags & _misc_has_been_redefined) != 0;
815 }
816 void set_has_been_redefined() {
817 _misc_flags |= _misc_has_been_redefined;
818 }
819
820 bool has_passed_fingerprint_check() const {
821 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
822 }
823 void set_has_passed_fingerprint_check(bool b) {
824 if (b) {
825 _misc_flags |= _misc_has_passed_fingerprint_check;
826 } else {
827 _misc_flags &= ~_misc_has_passed_fingerprint_check;
828 }
829 }
830 bool supers_have_passed_fingerprint_checks();
831
832 static bool should_store_fingerprint(bool is_unsafe_anonymous);
833 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
834 bool has_stored_fingerprint() const;
835 uint64_t get_stored_fingerprint() const;
836 void store_fingerprint(uint64_t fingerprint);
837
838 bool is_scratch_class() const {
839 return (_misc_flags & _misc_is_scratch_class) != 0;
840 }
841
842 void set_is_scratch_class() {
843 _misc_flags |= _misc_is_scratch_class;
844 }
845
846 bool has_resolved_methods() const {
847 return (_extra_flags & _extra_has_resolved_methods) != 0;
848 }
849
850 void set_has_resolved_methods() {
851 _extra_flags |= _extra_has_resolved_methods;
852 }
853 private:
854
855 void set_kind(unsigned kind) {
856 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
857 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
858 unsigned flags = _misc_flags & ~fmask;
859 _misc_flags = (flags | (kind << _misc_kind_field_pos));
860 }
861
862 bool is_kind(unsigned desired) const {
863 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
864 return kind == desired;
865 }
866
867 public:
868
869 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
870 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
871 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
872 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
873 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
874 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
875
876 #if INCLUDE_JVMTI
877
878 void init_previous_versions() {
879 _previous_versions = NULL;
880 }
881
882 private:
883 static bool _has_previous_versions;
884 public:
885 static void purge_previous_versions(InstanceKlass* ik) {
886 if (ik->has_been_redefined()) {
887 ik->purge_previous_version_list();
888 }
889 }
890
891 static bool has_previous_versions_and_reset();
892 static bool has_previous_versions() { return _has_previous_versions; }
893
894 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
895 void set_cached_class_file(JvmtiCachedClassFileData *data) {
896 _cached_class_file = data;
897 }
898 JvmtiCachedClassFileData * get_cached_class_file();
899 jint get_cached_class_file_len();
900 unsigned char * get_cached_class_file_bytes();
901
902 // JVMTI: Support for caching of field indices, types, and offsets
903 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
904 _jvmti_cached_class_field_map = descriptor;
905 }
906 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
907 return _jvmti_cached_class_field_map;
908 }
909 #else // INCLUDE_JVMTI
910
911 static void purge_previous_versions(InstanceKlass* ik) { return; };
912 static bool has_previous_versions_and_reset() { return false; }
913
914 void set_cached_class_file(JvmtiCachedClassFileData *data) {
915 assert(data == NULL, "unexpected call with JVMTI disabled");
916 }
917 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
918
919 #endif // INCLUDE_JVMTI
920
921 bool has_nonstatic_concrete_methods() const {
922 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
923 }
924 void set_has_nonstatic_concrete_methods(bool b) {
925 if (b) {
926 _misc_flags |= _misc_has_nonstatic_concrete_methods;
927 } else {
928 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
929 }
930 }
931
932 bool declares_nonstatic_concrete_methods() const {
933 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
934 }
935 void set_declares_nonstatic_concrete_methods(bool b) {
936 if (b) {
937 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
938 } else {
939 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
940 }
941 }
942
943 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
944 inline u2 next_method_idnum();
945 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
946
947 // generics support
948 Symbol* generic_signature() const {
949 return (_generic_signature_index == 0) ?
950 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
951 }
952 u2 generic_signature_index() const {
953 return _generic_signature_index;
954 }
955 void set_generic_signature_index(u2 sig_index) {
956 _generic_signature_index = sig_index;
957 }
958
959 u2 enclosing_method_data(int offset) const;
960 u2 enclosing_method_class_index() const {
961 return enclosing_method_data(enclosing_method_class_index_offset);
962 }
963 u2 enclosing_method_method_index() {
964 return enclosing_method_data(enclosing_method_method_index_offset);
965 }
966 void set_enclosing_method_indices(u2 class_index,
967 u2 method_index);
968
969 // jmethodID support
970 jmethodID get_jmethod_id(const methodHandle& method_h);
971 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
972 jmethodID new_id, jmethodID* new_jmeths,
973 jmethodID* to_dealloc_id_p,
974 jmethodID** to_dealloc_jmeths_p);
975 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
976 size_t *length_p, jmethodID* id_p);
977 void ensure_space_for_methodids(int start_offset = 0);
978 jmethodID jmethod_id_or_null(Method* method);
979
980 // annotations support
981 Annotations* annotations() const { return _annotations; }
982 void set_annotations(Annotations* anno) { _annotations = anno; }
983
984 AnnotationArray* class_annotations() const {
985 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
986 }
987 Array<AnnotationArray*>* fields_annotations() const {
988 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
989 }
990 AnnotationArray* class_type_annotations() const {
991 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
992 }
993 Array<AnnotationArray*>* fields_type_annotations() const {
994 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
995 }
996 // allocation
997 instanceOop allocate_instance(TRAPS);
998
999 // additional member function to return a handle
1000 instanceHandle allocate_instance_handle(TRAPS);
1001
1002 objArrayOop allocate_objArray(int n, int length, TRAPS);
1003 // Helper function
1004 static instanceOop register_finalizer(instanceOop i, TRAPS);
1005
1006 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
1007 // if not, throw either an Error or an Exception.
1008 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
1009
1010 // initialization
1011 void call_class_initializer(TRAPS);
1012 void set_initialization_state_and_notify(ClassState state, TRAPS);
1013
1014 // OopMapCache support
1015 OopMapCache* oop_map_cache() { return _oop_map_cache; }
1016 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
1017 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
1018
1019 // JNI identifier support (for static fields - for jni performance)
1020 JNIid* jni_ids() { return _jni_ids; }
1021 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
1022 JNIid* jni_id_for(int offset);
1023
1024 // maintenance of deoptimization dependencies
1025 inline DependencyContext dependencies();
1026 int mark_dependent_nmethods(KlassDepChange& changes);
1027 void add_dependent_nmethod(nmethod* nm);
1028 void remove_dependent_nmethod(nmethod* nm);
1029 void clean_dependency_context();
1030
1031 // On-stack replacement support
1032 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1033 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1034 void add_osr_nmethod(nmethod* n);
1035 bool remove_osr_nmethod(nmethod* n);
1036 int mark_osr_nmethods(const Method* m);
1037 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1038
1039 #if INCLUDE_JVMTI
1040 // Breakpoint support (see methods on Method* for details)
1041 BreakpointInfo* breakpoints() const { return _breakpoints; };
1042 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1043 #endif
1044
1045 // support for stub routines
1046 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1047 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1048 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1049
1050 static ByteSize adr_valueklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_valueklass_fixed_block)); }
1051
1052 // subclass/subinterface checks
1053 bool implements_interface(Klass* k) const;
1054 bool is_same_or_direct_interface(Klass* k) const;
1055
1056 #ifdef ASSERT
1057 // check whether this class or one of its superclasses was redefined
1058 bool has_redefined_this_or_super() const;
1059 #endif
1060
1061 // Access to the implementor of an interface.
1062 Klass* implementor() const;
1063 void set_implementor(Klass* k);
1064 int nof_implementors() const;
1065 void add_implementor(Klass* k); // k is a new class that implements this interface
1066 void init_implementor(); // initialize
1067
1068 // link this class into the implementors list of every interface it implements
1069 void process_interfaces(Thread *thread);
1070
1071 // virtual operations from Klass
1072 bool is_leaf_class() const { return _subklass == NULL; }
1073 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1074 Array<InstanceKlass*>* transitive_interfaces);
1075 bool can_be_primary_super_slow() const;
1076 int oop_size(oop obj) const { return size_helper(); }
1077 // slow because it's a virtual call and used for verifying the layout_helper.
1078 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1079 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1080
1081 // Iterators
1082 void do_local_static_fields(FieldClosure* cl);
1083 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1084 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1085
1086 void methods_do(void f(Method* method));
1087 virtual void array_klasses_do(void f(Klass* k));
1088
1089 static InstanceKlass* cast(Klass* k) {
1090 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1091 }
1092
1093 static const InstanceKlass* cast(const Klass* k) {
1094 assert(k != NULL, "k should not be null");
1095 assert(k->is_instance_klass(), "cast to InstanceKlass");
1096 return static_cast<const InstanceKlass*>(k);
1097 }
1098
1099 virtual InstanceKlass* java_super() const {
1100 return (super() == NULL) ? NULL : cast(super());
1101 }
1102
1103 // Sizing (in words)
1104 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1105
1106 static int size(int vtable_length, int itable_length,
1107 int nonstatic_oop_map_size,
1108 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint,
1109 int java_fields, bool is_value_type) {
1110 return align_metadata_size(header_size() +
1111 vtable_length +
1112 itable_length +
1113 nonstatic_oop_map_size +
1114 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1115 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1116 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1117 (java_fields * (int)sizeof(Klass*)/wordSize) +
1118 (is_value_type ? (int)sizeof(ValueKlassFixedBlock) : 0));
1119 }
1120 int size() const { return size(vtable_length(),
1121 itable_length(),
1122 nonstatic_oop_map_size(),
1123 is_interface(),
1124 is_unsafe_anonymous(),
1125 has_stored_fingerprint(),
1126 has_value_fields() ? java_fields_count() : 0,
1127 is_value());
1128 }
1129 #if INCLUDE_SERVICES
1130 virtual void collect_statistics(KlassSizeStats *sz) const;
1131 #endif
1132
1133 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1134 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1135
1136 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1137
1138 oop static_field_base_raw() { return java_mirror(); }
1139
1140 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1141
1142 OopMapBlock* start_of_nonstatic_oop_maps() const {
1143 return (OopMapBlock*)(start_of_itable() + itable_length());
1144 }
1145
1146 Klass** end_of_nonstatic_oop_maps() const {
1147 return (Klass**)(start_of_nonstatic_oop_maps() +
1148 nonstatic_oop_map_count());
1149 }
1150
1151 Klass* volatile* adr_implementor() const {
1152 if (is_interface()) {
1153 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1154 } else {
1155 return NULL;
1156 }
1157 };
1158
1159 InstanceKlass** adr_unsafe_anonymous_host() const {
1160 if (is_unsafe_anonymous()) {
1161 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1162 if (adr_impl != NULL) {
1163 return adr_impl + 1;
1164 } else {
1165 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1166 }
1167 } else {
1168 return NULL;
1169 }
1170 }
1171
1172 address adr_fingerprint() const {
1173 if (has_stored_fingerprint()) {
1174 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1175 if (adr_host != NULL) {
1176 return (address)(adr_host + 1);
1177 }
1178
1179 Klass* volatile* adr_impl = adr_implementor();
1180 if (adr_impl != NULL) {
1181 return (address)(adr_impl + 1);
1182 }
1183
1184 return (address)end_of_nonstatic_oop_maps();
1185 } else {
1186 return NULL;
1187 }
1188 }
1189
1190 address adr_value_fields_klasses() const {
1191 if (has_value_fields()) {
1192 address adr_fing = adr_fingerprint();
1193 if (adr_fing != NULL) {
1194 return adr_fingerprint() + sizeof(u8);
1195 }
1196
1197 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1198 if (adr_host != NULL) {
1199 return (address)(adr_host + 1);
1200 }
1201
1202 Klass* volatile* adr_impl = adr_implementor();
1203 if (adr_impl != NULL) {
1204 return (address)(adr_impl + 1);
1205 }
1206
1207 return (address)end_of_nonstatic_oop_maps();
1208 } else {
1209 return NULL;
1210 }
1211 }
1212
1213 Klass* get_value_field_klass(int idx) const {
1214 assert(has_value_fields(), "Sanity checking");
1215 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1216 assert(k != NULL, "Should always be set before being read");
1217 assert(k->is_value(), "Must be a value type");
1218 return k;
1219 }
1220
1221 Klass* get_value_field_klass_or_null(int idx) const {
1222 assert(has_value_fields(), "Sanity checking");
1223 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1224 assert(k == NULL || k->is_value(), "Must be a value type");
1225 return k;
1226 }
1227
1228 void set_value_field_klass(int idx, Klass* k) {
1229 assert(has_value_fields(), "Sanity checking");
1230 assert(k != NULL, "Should not be set to NULL");
1231 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1232 ((Klass**)adr_value_fields_klasses())[idx] = k;
1233 }
1234
1235 // Use this to return the size of an instance in heap words:
1236 virtual int size_helper() const {
1237 return layout_helper_to_size_helper(layout_helper());
1238 }
1239
1240 // This bit is initialized in classFileParser.cpp.
1241 // It is false under any of the following conditions:
1242 // - the class is abstract (including any interface)
1243 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1244 // - the class size is larger than FastAllocateSizeLimit
1245 // - the class is java/lang/Class, which cannot be allocated directly
1246 bool can_be_fastpath_allocated() const {
1247 return !layout_helper_needs_slow_path(layout_helper());
1248 }
1249
1250 // Java itable
1251 klassItable itable() const; // return klassItable wrapper
1252 Method* method_at_itable(Klass* holder, int index, TRAPS);
1253
1254 #if INCLUDE_JVMTI
1255 void adjust_default_methods(bool* trace_name_printed);
1256 #endif // INCLUDE_JVMTI
1257
1258 void clean_weak_instanceklass_links();
1259 private:
1260 void clean_implementors_list();
1261 void clean_method_data();
1262
1263 public:
1264 // Explicit metaspace deallocation of fields
1265 // For RedefineClasses and class file parsing errors, we need to deallocate
1266 // instanceKlasses and the metadata they point to.
1267 void deallocate_contents(ClassLoaderData* loader_data);
1268 static void deallocate_methods(ClassLoaderData* loader_data,
1269 Array<Method*>* methods);
1270 void static deallocate_interfaces(ClassLoaderData* loader_data,
1271 const Klass* super_klass,
1272 Array<InstanceKlass*>* local_interfaces,
1273 Array<InstanceKlass*>* transitive_interfaces);
1274
1275 // The constant pool is on stack if any of the methods are executing or
1276 // referenced by handles.
1277 bool on_stack() const { return _constants->on_stack(); }
1278
1279 // callbacks for actions during class unloading
1280 static void unload_class(InstanceKlass* ik);
1281 static void release_C_heap_structures(InstanceKlass* ik);
1282
1283 // Naming
1284 const char* signature_name() const;
1285 const char* signature_name_of(char c) const;
1286 static Symbol* package_from_name(const Symbol* name, TRAPS);
1287
1288 // Oop fields (and metadata) iterators
1289 //
1290 // The InstanceKlass iterators also visits the Object's klass.
1291
1292 // Forward iteration
1293 public:
1294 // Iterate over all oop fields in the oop maps.
1295 template <typename T, class OopClosureType>
1296 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1297
1298 // Iterate over all oop fields and metadata.
1299 template <typename T, class OopClosureType>
1300 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1301
1302 // Iterate over all oop fields in one oop map.
1303 template <typename T, class OopClosureType>
1304 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1305
1306
1307 // Reverse iteration
1308 // Iterate over all oop fields and metadata.
1309 template <typename T, class OopClosureType>
1310 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1311
1312 private:
1313 // Iterate over all oop fields in the oop maps.
1314 template <typename T, class OopClosureType>
1315 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1316
1317 // Iterate over all oop fields in one oop map.
1318 template <typename T, class OopClosureType>
1319 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1320
1321
1322 // Bounded range iteration
1323 public:
1324 // Iterate over all oop fields in the oop maps.
1325 template <typename T, class OopClosureType>
1326 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1327
1328 // Iterate over all oop fields and metadata.
1329 template <typename T, class OopClosureType>
1330 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1331
1332 private:
1333 // Iterate over all oop fields in one oop map.
1334 template <typename T, class OopClosureType>
1335 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1336
1337
1338 public:
1339 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1340
1341 public:
1342 void set_in_error_state() {
1343 assert(DumpSharedSpaces, "only call this when dumping archive");
1344 _init_state = initialization_error;
1345 }
1346 bool check_sharing_error_state();
1347
1348 private:
1349 // initialization state
1350 void set_init_state(ClassState state);
1351 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1352 void set_init_thread(Thread *thread) { _init_thread = thread; }
1353
1354 // The RedefineClasses() API can cause new method idnums to be needed
1355 // which will cause the caches to grow. Safety requires different
1356 // cache management logic if the caches can grow instead of just
1357 // going from NULL to non-NULL.
1358 bool idnum_can_increment() const { return has_been_redefined(); }
1359 inline jmethodID* methods_jmethod_ids_acquire() const;
1360 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1361
1362 // Lock during initialization
1363 public:
1364 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1365 // Must be one per class and it has to be a VM internal object so java code
1366 // cannot lock it (like the mirror).
1367 // It has to be an object not a Mutex because it's held through java calls.
1368 oop init_lock() const;
1369 private:
1370 void fence_and_clear_init_lock();
1371
1372 bool link_class_impl (TRAPS);
1373 bool verify_code (TRAPS);
1374 void initialize_impl (TRAPS);
1375 void initialize_super_interfaces (TRAPS);
1376 void eager_initialize_impl ();
1377 /* jni_id_for_impl for jfieldID only */
1378 JNIid* jni_id_for_impl (int offset);
1379 protected:
1380 // Returns the array class for the n'th dimension
1381 virtual Klass* array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS);
1382
1383 // Returns the array class with this class as element type
1384 virtual Klass* array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS);
1385
1386 private:
1387
1388 // find a local method (returns NULL if not found)
1389 Method* find_method_impl(const Symbol* name,
1390 const Symbol* signature,
1391 OverpassLookupMode overpass_mode,
1392 StaticLookupMode static_mode,
1393 PrivateLookupMode private_mode) const;
1394
1395 static Method* find_method_impl(const Array<Method*>* methods,
1396 const Symbol* name,
1397 const Symbol* signature,
1398 OverpassLookupMode overpass_mode,
1399 StaticLookupMode static_mode,
1400 PrivateLookupMode private_mode);
1401
1402 // Free CHeap allocated fields.
1403 void release_C_heap_structures();
1404
1405 #if INCLUDE_JVMTI
1406 // RedefineClasses support
1407 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1408 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1409 #endif
1410 public:
1411 // CDS support - remove and restore oops from metadata. Oops are not shared.
1412 virtual void remove_unshareable_info();
1413 virtual void remove_java_mirror();
1414 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1415
1416 // jvm support
1417 jint compute_modifier_flags(TRAPS) const;
1418
1419 public:
1420 // JVMTI support
1421 jint jvmti_class_status() const;
1422
1423 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1424
1425 public:
1426 // Printing
1427 #ifndef PRODUCT
1428 void print_on(outputStream* st) const;
1429 #endif
1430 void print_value_on(outputStream* st) const;
1431
1432 void oop_print_value_on(oop obj, outputStream* st);
1433
1434 #ifndef PRODUCT
1435 void oop_print_on (oop obj, outputStream* st);
1436
1437 void print_dependent_nmethods(bool verbose = false);
1438 bool is_dependent_nmethod(nmethod* nm);
1439 bool verify_itable_index(int index);
1440 #endif
1441
1442 const char* internal_name() const;
1443
1444 // Verification
1445 void verify_on(outputStream* st);
1446
1447 void oop_verify_on(oop obj, outputStream* st);
1448
1449 // Logging
1450 void print_class_load_logging(ClassLoaderData* loader_data,
1451 const char* module_name,
1452 const ClassFileStream* cfs) const;
1453 };
1454
1455 // for adding methods
1456 // UNSET_IDNUM return means no more ids available
1457 inline u2 InstanceKlass::next_method_idnum() {
1458 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1459 return ConstMethod::UNSET_IDNUM; // no more ids available
1460 } else {
1461 return _idnum_allocated_count++;
1462 }
1463 }
1464
1465
1466 /* JNIid class for jfieldIDs only */
1467 class JNIid: public CHeapObj<mtClass> {
1468 friend class VMStructs;
1469 private:
1470 Klass* _holder;
1471 JNIid* _next;
1472 int _offset;
1473 #ifdef ASSERT
1474 bool _is_static_field_id;
1475 #endif
1476
1477 public:
1478 // Accessors
1479 Klass* holder() const { return _holder; }
1480 int offset() const { return _offset; }
1481 JNIid* next() { return _next; }
1482 // Constructor
1483 JNIid(Klass* holder, int offset, JNIid* next);
1484 // Identifier lookup
1485 JNIid* find(int offset);
1486
1487 bool find_local_field(fieldDescriptor* fd) {
1488 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1489 }
1490
1491 static void deallocate(JNIid* id);
1492 // Debugging
1493 #ifdef ASSERT
1494 bool is_static_field_id() const { return _is_static_field_id; }
1495 void set_is_static_field_id() { _is_static_field_id = true; }
1496 #endif
1497 void verify(Klass* holder);
1498 };
1499
1500 // An iterator that's used to access the inner classes indices in the
1501 // InstanceKlass::_inner_classes array.
1502 class InnerClassesIterator : public StackObj {
1503 private:
1504 Array<jushort>* _inner_classes;
1505 int _length;
1506 int _idx;
1507 public:
1508
1509 InnerClassesIterator(const InstanceKlass* k) {
1510 _inner_classes = k->inner_classes();
1511 if (k->inner_classes() != NULL) {
1512 _length = _inner_classes->length();
1513 // The inner class array's length should be the multiple of
1514 // inner_class_next_offset if it only contains the InnerClasses
1515 // attribute data, or it should be
1516 // n*inner_class_next_offset+enclosing_method_attribute_size
1517 // if it also contains the EnclosingMethod data.
1518 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1519 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1520 "just checking");
1521 // Remove the enclosing_method portion if exists.
1522 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1523 _length -= InstanceKlass::enclosing_method_attribute_size;
1524 }
1525 } else {
1526 _length = 0;
1527 }
1528 _idx = 0;
1529 }
1530
1531 int length() const {
1532 return _length;
1533 }
1534
1535 void next() {
1536 _idx += InstanceKlass::inner_class_next_offset;
1537 }
1538
1539 bool done() const {
1540 return (_idx >= _length);
1541 }
1542
1543 u2 inner_class_info_index() const {
1544 return _inner_classes->at(
1545 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1546 }
1547
1548 void set_inner_class_info_index(u2 index) {
1549 _inner_classes->at_put(
1550 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1551 }
1552
1553 u2 outer_class_info_index() const {
1554 return _inner_classes->at(
1555 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1556 }
1557
1558 void set_outer_class_info_index(u2 index) {
1559 _inner_classes->at_put(
1560 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1561 }
1562
1563 u2 inner_name_index() const {
1564 return _inner_classes->at(
1565 _idx + InstanceKlass::inner_class_inner_name_offset);
1566 }
1567
1568 void set_inner_name_index(u2 index) {
1569 _inner_classes->at_put(
1570 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1571 }
1572
1573 u2 inner_access_flags() const {
1574 return _inner_classes->at(
1575 _idx + InstanceKlass::inner_class_access_flags_offset);
1576 }
1577 };
1578
1579 #endif // SHARE_OOPS_INSTANCEKLASS_HPP