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/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/packageEntry.hpp"
32 #include "code/vmreg.hpp"
33 #include "memory/referenceType.hpp"
34 #include "oops/annotations.hpp"
35 #include "oops/constMethod.hpp"
36 #include "oops/fieldInfo.hpp"
37 #include "oops/instanceOop.hpp"
38 #include "oops/klassVtable.hpp"
39 #include "runtime/handles.hpp"
40 #include "runtime/os.hpp"
41 #include "utilities/accessFlags.hpp"
42 #include "utilities/align.hpp"
43 #include "utilities/macros.hpp"
44 #if INCLUDE_JFR
45 #include "jfr/support/jfrKlassExtension.hpp"
46 #endif
47
48
49 // An InstanceKlass is the VM level representation of a Java class.
50 // It contains all information needed for at class at execution runtime.
51
52 // InstanceKlass embedded field layout (after declared fields):
53 // [EMBEDDED Java vtable ] size in words = vtable_len
54 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
55 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
56 // indicating where oops are located in instances of this klass.
57 // [EMBEDDED implementor of the interface] only exist for interface
58 // [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
59 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
60 // [EMBEDDED ValueKlassFixedBlock] only if is a ValueKlass instance
61
62
63 // forward declaration for class -- see below for definition
64 #if INCLUDE_JVMTI
65 class BreakpointInfo;
66 #endif
67 class ClassFileParser;
68 class KlassDepChange;
69 class DependencyContext;
70 class fieldDescriptor;
71 class jniIdMapBase;
72 class JNIid;
73 class JvmtiCachedClassFieldMap;
74 class nmethodBucket;
75 class SuperTypeClosure;
76 class OopMapCache;
77 class BufferedValueTypeBlob;
78 class InterpreterOopMap;
79
80 // This is used in iterators below.
81 class FieldClosure: public StackObj {
82 public:
83 virtual void do_field(fieldDescriptor* fd) = 0;
84 };
85
86 #ifndef PRODUCT
87 // Print fields.
88 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
89 class FieldPrinter: public FieldClosure {
90 oop _obj;
91 outputStream* _st;
92 public:
93 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
94 void do_field(fieldDescriptor* fd);
95 };
96 #endif // !PRODUCT
97
98 // Describes where oops are located in instances of this klass.
99 class OopMapBlock {
100 public:
101 // Byte offset of the first oop mapped by this block.
102 int offset() const { return _offset; }
103 void set_offset(int offset) { _offset = offset; }
104
105 // Number of oops in this block.
106 uint count() const { return _count; }
107 void set_count(uint count) { _count = count; }
108
109 void increment_count(int diff) { _count += diff; }
110
111 int offset_span() const { return _count * heapOopSize; }
112
113 int end_offset() const {
114 return offset() + offset_span();
115 }
116
117 bool is_contiguous(int another_offset) const {
118 return another_offset == end_offset();
119 }
120
121 // sizeof(OopMapBlock) in words.
122 static const int size_in_words() {
123 return align_up((int)sizeof(OopMapBlock), wordSize) >>
124 LogBytesPerWord;
125 }
126
127 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
128 return a->offset() - b->offset();
129 }
130
131 private:
132 int _offset;
133 uint _count;
134 };
135
136 struct JvmtiCachedClassFileData;
137
138 class SigEntry;
139
140 class ValueKlassFixedBlock {
141 Array<SigEntry>** _extended_sig;
142 Array<VMRegPair>** _return_regs;
143 address* _pack_handler;
144 address* _unpack_handler;
145 int* _default_value_offset;
146
147 friend class ValueKlass;
148 };
149
150 class ValueTypes {
151 public:
152 u2 _class_info_index;
153 Symbol* _class_name;
154 };
155
156 class InstanceKlass: public Klass {
157 friend class VMStructs;
158 friend class JVMCIVMStructs;
159 friend class ClassFileParser;
160 friend class CompileReplay;
161
162 public:
163 static const KlassID ID = InstanceKlassID;
164
165 protected:
166 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
167
168 public:
169 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
170
171 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
172 // of the class loading & initialization procedure, and the use of the states.
173 enum ClassState {
174 allocated, // allocated (but not yet linked)
175 loaded, // loaded and inserted in class hierarchy (but not linked yet)
176 linked, // successfully linked/verified (but not initialized yet)
177 being_initialized, // currently running class initializer
178 fully_initialized, // initialized (successfull final state)
179 initialization_error // error happened during initialization
180 };
181
182 private:
183 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
184
185 protected:
186 // If you add a new field that points to any metaspace object, you
187 // must add this field to InstanceKlass::metaspace_pointers_do().
188
189 // Annotations for this class
190 Annotations* _annotations;
191 // Package this class is defined in
192 PackageEntry* _package_entry;
193 // Array classes holding elements of this class.
194 Klass* volatile _array_klasses;
195 // Constant pool for this class.
196 ConstantPool* _constants;
197 // The InnerClasses attribute and EnclosingMethod attribute. The
198 // _inner_classes is an array of shorts. If the class has InnerClasses
199 // attribute, then the _inner_classes array begins with 4-tuples of shorts
200 // [inner_class_info_index, outer_class_info_index,
201 // inner_name_index, inner_class_access_flags] for the InnerClasses
202 // attribute. If the EnclosingMethod attribute exists, it occupies the
203 // last two shorts [class_index, method_index] of the array. If only
204 // the InnerClasses attribute exists, the _inner_classes array length is
205 // number_of_inner_classes * 4. If the class has both InnerClasses
206 // and EnclosingMethod attributes the _inner_classes array length is
207 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
208 Array<jushort>* _inner_classes;
209
210 // The NestMembers attribute. An array of shorts, where each is a
211 // class info index for the class that is a nest member. This data
212 // has not been validated.
213 Array<jushort>* _nest_members;
214
215 // The NestHost attribute. The class info index for the class
216 // that is the nest-host of this class. This data has not been validated.
217 jushort _nest_host_index;
218
219 // Resolved nest-host klass: either true nest-host or self if we are not nested.
220 // By always being set it makes nest-member access checks simpler.
221 InstanceKlass* _nest_host;
222
223 Array<ValueTypes>* _value_types;
224
225 // the source debug extension for this klass, NULL if not specified.
226 // Specified as UTF-8 string without terminating zero byte in the classfile,
227 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
228 const char* _source_debug_extension;
229 // Array name derived from this class which needs unreferencing
230 // if this class is unloaded.
231 Symbol* _array_name;
232
233 // Number of heapOopSize words used by non-static fields in this klass
234 // (including inherited fields but after header_size()).
235 int _nonstatic_field_size;
236 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
237 // Constant pool index to the utf8 entry of the Generic signature,
238 // or 0 if none.
239 u2 _generic_signature_index;
240 // Constant pool index to the utf8 entry for the name of source file
241 // containing this klass, 0 if not specified.
242 u2 _source_file_name_index;
243 u2 _static_oop_field_count;// number of static oop fields in this klass
244 u2 _java_fields_count; // The number of declared Java fields
245 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
246
247 int _itable_len; // length of Java itable (in words)
248 // _is_marked_dependent can be set concurrently, thus cannot be part of the
249 // _misc_flags.
250 bool _is_marked_dependent; // used for marking during flushing and deoptimization
251
252 public:
253 enum {
254 _extra_is_being_redefined = 1 << 0, // used for locking redefinition
255 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class
256 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty
257 _extra_is_bufferable = 1 << 3 // value can be buffered out side of the Java heap
258 };
259
260 protected:
261 u1 _extra_flags;
262
263 // The low three bits of _misc_flags contains the kind field.
264 // This can be used to quickly discriminate among the five kinds of
265 // InstanceKlass.
266
267 static const unsigned _misc_kind_field_size = 3;
268 static const unsigned _misc_kind_field_pos = 0;
269 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
270
271 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
272 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
273 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
274 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
275 static const unsigned _misc_kind_value_type = 4; // ValueKlass
276
277 // Start after _misc_kind field.
278 enum {
279 _misc_rewritten = 1 << 3, // methods rewritten.
280 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops
281 _misc_should_verify_class = 1 << 5, // allow caching of preverification
282 _misc_is_unsafe_anonymous = 1 << 6, // has embedded _unsafe_anonymous_host field
283 _misc_is_contended = 1 << 7, // marked with contended annotation
284 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods
285 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods
286 _misc_has_been_redefined = 1 << 10, // class has been redefined
287 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its
288 // code source was found to be matching the value recorded by AOT.
289 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class
290 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader
291 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader
292 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader
293 // u2 _misc_flags full (see _extra_flags)
294 };
295 u2 loader_type_bits() {
296 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
297 }
298 u2 _misc_flags;
299 u2 _minor_version; // minor version number of class file
300 u2 _major_version; // major version number of class file
301 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
302 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
303 JNIid* _jni_ids; // First JNI identifier for static fields in this class
304 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
305 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
306 uint64_t volatile _dep_context_last_cleaned;
307 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
308 #if INCLUDE_JVMTI
309 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
310 // Linked instanceKlasses of previous versions
311 InstanceKlass* _previous_versions;
312 // JVMTI fields can be moved to their own structure - see 6315920
313 // JVMTI: cached class file, before retransformable agent modified it in CFLH
314 JvmtiCachedClassFileData* _cached_class_file;
315 #endif
316
317 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
318
319 // Class states are defined as ClassState (see above).
320 // Place the _init_state here to utilize the unused 2-byte after
321 // _idnum_allocated_count.
322 u1 _init_state; // state of class
323 u1 _reference_type; // reference type
324
325 u2 _this_class_index; // constant pool entry
326 #if INCLUDE_JVMTI
327 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
328 #endif
329
330 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
331
332 // Method array.
333 Array<Method*>* _methods;
334 // Default Method Array, concrete methods inherited from interfaces
335 Array<Method*>* _default_methods;
336 // Interfaces (InstanceKlass*s) this class declares locally to implement.
337 Array<InstanceKlass*>* _local_interfaces;
338 // Interfaces (InstanceKlass*s) this class implements transitively.
339 Array<InstanceKlass*>* _transitive_interfaces;
340 // Int array containing the original order of method in the class file (for JVMTI).
341 Array<int>* _method_ordering;
342 // Int array containing the vtable_indices for default_methods
343 // offset matches _default_methods offset
344 Array<int>* _default_vtable_indices;
345
346 // Instance and static variable information, starts with 6-tuples of shorts
347 // [access, name index, sig index, initval index, low_offset, high_offset]
348 // for all fields, followed by the generic signature data at the end of
349 // the array. Only fields with generic signature attributes have the generic
350 // signature data set in the array. The fields array looks like following:
351 //
352 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
353 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
354 // ...
355 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
356 // [generic signature index]
357 // [generic signature index]
358 // ...
359 Array<u2>* _fields;
360
361 const ValueKlassFixedBlock* _adr_valueklass_fixed_block;
362
363 // embedded Java vtable follows here
364 // embedded Java itables follows here
365 // embedded static fields follows here
366 // embedded nonstatic oop-map blocks follows here
367 // embedded implementor of this interface follows here
368 // The embedded implementor only exists if the current klass is an
369 // iterface. The possible values of the implementor fall into following
370 // three cases:
371 // NULL: no implementor.
372 // A Klass* that's not itself: one implementor.
373 // Itself: more than one implementors.
374 // embedded unsafe_anonymous_host klass follows here
375 // The embedded host klass only exists in an unsafe anonymous class for
376 // dynamic language support (JSR 292 enabled). The host class grants
377 // its access privileges to this class also. The host class is either
378 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
379 // or an anonymous class loaded through normal classloading does not
380 // have this embedded field.
381 //
382
383 friend class SystemDictionary;
384
385 public:
386 u2 loader_type() {
387 return _misc_flags & loader_type_bits();
388 }
389
390 bool is_shared_boot_class() const {
391 return (_misc_flags & _misc_is_shared_boot_class) != 0;
392 }
393 bool is_shared_platform_class() const {
394 return (_misc_flags & _misc_is_shared_platform_class) != 0;
395 }
396 bool is_shared_app_class() const {
397 return (_misc_flags & _misc_is_shared_app_class) != 0;
398 }
399
400 void clear_class_loader_type() {
401 _misc_flags &= ~loader_type_bits();
402 }
403
404 void set_class_loader_type(s2 loader_type) {
405 switch (loader_type) {
406 case ClassLoader::BOOT_LOADER:
407 _misc_flags |= _misc_is_shared_boot_class;
408 break;
409 case ClassLoader::PLATFORM_LOADER:
410 _misc_flags |= _misc_is_shared_platform_class;
411 break;
412 case ClassLoader::APP_LOADER:
413 _misc_flags |= _misc_is_shared_app_class;
414 break;
415 default:
416 ShouldNotReachHere();
417 break;
418 }
419 }
420
421 bool has_nonstatic_fields() const {
422 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
423 }
424 void set_has_nonstatic_fields(bool b) {
425 if (b) {
426 _misc_flags |= _misc_has_nonstatic_fields;
427 } else {
428 _misc_flags &= ~_misc_has_nonstatic_fields;
429 }
430 }
431
432 bool has_value_fields() const {
433 return (_extra_flags & _extra_has_value_fields) != 0;
434 }
435 void set_has_value_fields() {
436 _extra_flags |= _extra_has_value_fields;
437 }
438
439 // field sizes
440 int nonstatic_field_size() const { return _nonstatic_field_size; }
441 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
442
443 int static_field_size() const { return _static_field_size; }
444 void set_static_field_size(int size) { _static_field_size = size; }
445
446 int static_oop_field_count() const { return (int)_static_oop_field_count; }
447 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
448
449 // Java itable
450 int itable_length() const { return _itable_len; }
451 void set_itable_length(int len) { _itable_len = len; }
452
453 // array klasses
454 Klass* array_klasses() const { return _array_klasses; }
455 inline Klass* array_klasses_acquire() const; // load with acquire semantics
456 void set_array_klasses(Klass* k) { _array_klasses = k; }
457 inline void release_set_array_klasses(Klass* k); // store with release semantics
458
459 // methods
460 Array<Method*>* methods() const { return _methods; }
461 void set_methods(Array<Method*>* a) { _methods = a; }
462 Method* method_with_idnum(int idnum);
463 Method* method_with_orig_idnum(int idnum);
464 Method* method_with_orig_idnum(int idnum, int version);
465
466 // method ordering
467 Array<int>* method_ordering() const { return _method_ordering; }
468 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
469 void copy_method_ordering(const intArray* m, TRAPS);
470
471 // default_methods
472 Array<Method*>* default_methods() const { return _default_methods; }
473 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
474
475 // default method vtable_indices
476 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
477 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
478 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
479
480 // interfaces
481 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
482 void set_local_interfaces(Array<InstanceKlass*>* a) {
483 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
484 _local_interfaces = a; }
485
486 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
487 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
488 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
489 _transitive_interfaces = a;
490 }
491
492 private:
493 friend class fieldDescriptor;
494 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
495
496 public:
497 int field_offset (int index) const { return field(index)->offset(); }
498 int field_access_flags(int index) const { return field(index)->access_flags(); }
499 Symbol* field_name (int index) const { return field(index)->name(constants()); }
500 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
501 bool field_is_flattened(int index) const { return field(index)->is_flattened(); }
502
503 // Number of Java declared fields
504 int java_fields_count() const { return (int)_java_fields_count; }
505
506 Array<u2>* fields() const { return _fields; }
507 void set_fields(Array<u2>* f, u2 java_fields_count) {
508 guarantee(_fields == NULL || f == NULL, "Just checking");
509 _fields = f;
510 _java_fields_count = java_fields_count;
511 }
512
513 // inner classes
514 Array<u2>* inner_classes() const { return _inner_classes; }
515 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
516
517 // nest members
518 Array<u2>* nest_members() const { return _nest_members; }
519 void set_nest_members(Array<u2>* m) { _nest_members = m; }
520
521 // nest-host index
522 jushort nest_host_index() const { return _nest_host_index; }
523 void set_nest_host_index(u2 i) { _nest_host_index = i; }
524
525 private:
526 // Called to verify that k is a member of this nest - does not look at k's nest-host
527 bool has_nest_member(InstanceKlass* k, TRAPS) const;
528 public:
529 // Returns nest-host class, resolving and validating it if needed
530 // Returns NULL if an exception occurs during loading, or validation fails
531 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
532 // Check if this klass is a nestmate of k - resolves this nest-host and k's
533 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
534
535 enum InnerClassAttributeOffset {
536 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
537 inner_class_inner_class_info_offset = 0,
538 inner_class_outer_class_info_offset = 1,
539 inner_class_inner_name_offset = 2,
540 inner_class_access_flags_offset = 3,
541 inner_class_next_offset = 4
542 };
543
544 enum EnclosingMethodAttributeOffset {
545 enclosing_method_class_index_offset = 0,
546 enclosing_method_method_index_offset = 1,
547 enclosing_method_attribute_size = 2
548 };
549
550 // method override check
551 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
552
553 // package
554 PackageEntry* package() const { return _package_entry; }
555 ModuleEntry* module() const;
556 bool in_unnamed_package() const { return (_package_entry == NULL); }
557 void set_package(PackageEntry* p) { _package_entry = p; }
558 void set_package(ClassLoaderData* loader_data, TRAPS);
559 bool is_same_class_package(const Klass* class2) const;
560 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
561
562 // find an enclosing class
563 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
564
565 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
566 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
567
568 private:
569 // Check prohibited package ("java/" only loadable by boot or platform loaders)
570 static void check_prohibited_package(Symbol* class_name,
571 ClassLoaderData* loader_data,
572 TRAPS);
573 public:
574 // initialization state
575 bool is_loaded() const { return _init_state >= loaded; }
576 bool is_linked() const { return _init_state >= linked; }
577 bool is_initialized() const { return _init_state == fully_initialized; }
578 bool is_not_initialized() const { return _init_state < being_initialized; }
579 bool is_being_initialized() const { return _init_state == being_initialized; }
580 bool is_in_error_state() const { return _init_state == initialization_error; }
581 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
582 ClassState init_state() { return (ClassState)_init_state; }
583 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
584
585 // defineClass specified verification
586 bool should_verify_class() const {
587 return (_misc_flags & _misc_should_verify_class) != 0;
588 }
589 void set_should_verify_class(bool value) {
590 if (value) {
591 _misc_flags |= _misc_should_verify_class;
592 } else {
593 _misc_flags &= ~_misc_should_verify_class;
594 }
595 }
596
597 // marking
598 bool is_marked_dependent() const { return _is_marked_dependent; }
599 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
600
601 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); }
602
603 // initialization (virtuals from Klass)
604 bool should_be_initialized() const; // means that initialize should be called
605 void initialize(TRAPS);
606 void link_class(TRAPS);
607 bool link_class_or_fail(TRAPS); // returns false on failure
608 void rewrite_class(TRAPS);
609 void link_methods(TRAPS);
610 Method* class_initializer() const;
611
612 // set the class to initialized if no static initializer is present
613 void eager_initialize(Thread *thread);
614
615 // reference type
616 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
617 void set_reference_type(ReferenceType t) {
618 assert(t == (u1)t, "overflow");
619 _reference_type = (u1)t;
620 }
621
622 // this class cp index
623 u2 this_class_index() const { return _this_class_index; }
624 void set_this_class_index(u2 index) { _this_class_index = index; }
625
626 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
627
628 // find local field, returns true if found
629 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
630 // find field in direct superinterfaces, returns the interface in which the field is defined
631 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
632 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
633 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
634 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
635 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
636
637 // find a non-static or static field given its offset within the class.
638 bool contains_field_offset(int offset) {
639 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value());
640 }
641
642 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
643 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
644
645 // find a local method (returns NULL if not found)
646 Method* find_method(const Symbol* name, const Symbol* signature) const;
647 static Method* find_method(const Array<Method*>* methods,
648 const Symbol* name,
649 const Symbol* signature);
650
651 // find a local method, but skip static methods
652 Method* find_instance_method(const Symbol* name, const Symbol* signature,
653 PrivateLookupMode private_mode = find_private) const;
654 static Method* find_instance_method(const Array<Method*>* methods,
655 const Symbol* name,
656 const Symbol* signature,
657 PrivateLookupMode private_mode = find_private);
658
659 // find a local method (returns NULL if not found)
660 Method* find_local_method(const Symbol* name,
661 const Symbol* signature,
662 OverpassLookupMode overpass_mode,
663 StaticLookupMode static_mode,
664 PrivateLookupMode private_mode) const;
665
666 // find a local method from given methods array (returns NULL if not found)
667 static Method* find_local_method(const Array<Method*>* methods,
668 const Symbol* name,
669 const Symbol* signature,
670 OverpassLookupMode overpass_mode,
671 StaticLookupMode static_mode,
672 PrivateLookupMode private_mode);
673
674 // find a local method index in methods or default_methods (returns -1 if not found)
675 static int find_method_index(const Array<Method*>* methods,
676 const Symbol* name,
677 const Symbol* signature,
678 OverpassLookupMode overpass_mode,
679 StaticLookupMode static_mode,
680 PrivateLookupMode private_mode);
681
682 // lookup operation (returns NULL if not found)
683 Method* uncached_lookup_method(const Symbol* name,
684 const Symbol* signature,
685 OverpassLookupMode overpass_mode,
686 PrivateLookupMode private_mode = find_private) const;
687
688 // lookup a method in all the interfaces that this class implements
689 // (returns NULL if not found)
690 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
691
692 // lookup a method in local defaults then in all interfaces
693 // (returns NULL if not found)
694 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
695
696 // Find method indices by name. If a method with the specified name is
697 // found the index to the first method is returned, and 'end' is filled in
698 // with the index of first non-name-matching method. If no method is found
699 // -1 is returned.
700 int find_method_by_name(const Symbol* name, int* end) const;
701 static int find_method_by_name(const Array<Method*>* methods,
702 const Symbol* name, int* end);
703
704 // constant pool
705 ConstantPool* constants() const { return _constants; }
706 void set_constants(ConstantPool* c) { _constants = c; }
707
708 // protection domain
709 oop protection_domain() const;
710
711 // signers
712 objArrayOop signers() const;
713
714 // host class
715 InstanceKlass* unsafe_anonymous_host() const {
716 InstanceKlass** hk = adr_unsafe_anonymous_host();
717 if (hk == NULL) {
718 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
719 return NULL;
720 } else {
721 assert(*hk != NULL, "host klass should always be set if the address is not null");
722 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
723 return *hk;
724 }
725 }
726 void set_unsafe_anonymous_host(const InstanceKlass* host) {
727 assert(is_unsafe_anonymous(), "not unsafe anonymous");
728 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
729 assert(addr != NULL, "no reversed space");
730 if (addr != NULL) {
731 *addr = host;
732 }
733 }
734 bool is_unsafe_anonymous() const {
735 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
736 }
737 void set_is_unsafe_anonymous(bool value) {
738 if (value) {
739 _misc_flags |= _misc_is_unsafe_anonymous;
740 } else {
741 _misc_flags &= ~_misc_is_unsafe_anonymous;
742 }
743 }
744
745 bool is_contended() const {
746 return (_misc_flags & _misc_is_contended) != 0;
747 }
748 void set_is_contended(bool value) {
749 if (value) {
750 _misc_flags |= _misc_is_contended;
751 } else {
752 _misc_flags &= ~_misc_is_contended;
753 }
754 }
755
756 // source file name
757 Symbol* source_file_name() const {
758 return (_source_file_name_index == 0) ?
759 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
760 }
761 u2 source_file_name_index() const {
762 return _source_file_name_index;
763 }
764 void set_source_file_name_index(u2 sourcefile_index) {
765 _source_file_name_index = sourcefile_index;
766 }
767
768 // minor and major version numbers of class file
769 u2 minor_version() const { return _minor_version; }
770 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
771 u2 major_version() const { return _major_version; }
772 void set_major_version(u2 major_version) { _major_version = major_version; }
773
774 // source debug extension
775 const char* source_debug_extension() const { return _source_debug_extension; }
776 void set_source_debug_extension(const char* array, int length);
777
778 // symbol unloading support (refcount already added)
779 Symbol* array_name() { return _array_name; }
780 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
781
782 // nonstatic oop-map blocks
783 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
784 return oop_map_count * OopMapBlock::size_in_words();
785 }
786 unsigned int nonstatic_oop_map_count() const {
787 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
788 }
789 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
790 void set_nonstatic_oop_map_size(int words) {
791 _nonstatic_oop_map_size = words;
792 }
793
794 #if INCLUDE_JVMTI
795 // Redefinition locking. Class can only be redefined by one thread at a time.
796 bool is_being_redefined() const {
797 return (_extra_flags & _extra_is_being_redefined);
798 }
799 void set_is_being_redefined(bool value) {
800 if (value) {
801 _extra_flags |= _extra_is_being_redefined;
802 } else {
803 _extra_flags &= ~_extra_is_being_redefined;
804 }
805 }
806
807 // RedefineClasses() support for previous versions:
808 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
809 void purge_previous_version_list();
810
811 InstanceKlass* previous_versions() const { return _previous_versions; }
812 #else
813 InstanceKlass* previous_versions() const { return NULL; }
814 #endif
815
816 InstanceKlass* get_klass_version(int version) {
817 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
818 if (ik->constants()->version() == version) {
819 return ik;
820 }
821 }
822 return NULL;
823 }
824
825 bool has_been_redefined() const {
826 return (_misc_flags & _misc_has_been_redefined) != 0;
827 }
828 void set_has_been_redefined() {
829 _misc_flags |= _misc_has_been_redefined;
830 }
831
832 bool has_passed_fingerprint_check() const {
833 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
834 }
835 void set_has_passed_fingerprint_check(bool b) {
836 if (b) {
837 _misc_flags |= _misc_has_passed_fingerprint_check;
838 } else {
839 _misc_flags &= ~_misc_has_passed_fingerprint_check;
840 }
841 }
842 bool supers_have_passed_fingerprint_checks();
843
844 static bool should_store_fingerprint(bool is_unsafe_anonymous);
845 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
846 bool has_stored_fingerprint() const;
847 uint64_t get_stored_fingerprint() const;
848 void store_fingerprint(uint64_t fingerprint);
849
850 bool is_scratch_class() const {
851 return (_misc_flags & _misc_is_scratch_class) != 0;
852 }
853
854 void set_is_scratch_class() {
855 _misc_flags |= _misc_is_scratch_class;
856 }
857
858 bool has_resolved_methods() const {
859 return (_extra_flags & _extra_has_resolved_methods) != 0;
860 }
861
862 void set_has_resolved_methods() {
863 _extra_flags |= _extra_has_resolved_methods;
864 }
865 private:
866
867 void set_kind(unsigned kind) {
868 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
869 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
870 unsigned flags = _misc_flags & ~fmask;
871 _misc_flags = (flags | (kind << _misc_kind_field_pos));
872 }
873
874 bool is_kind(unsigned desired) const {
875 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
876 return kind == desired;
877 }
878
879 public:
880
881 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
882 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
883 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
884 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
885 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
886 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
887
888 #if INCLUDE_JVMTI
889
890 void init_previous_versions() {
891 _previous_versions = NULL;
892 }
893
894 private:
895 static bool _has_previous_versions;
896 public:
897 static void purge_previous_versions(InstanceKlass* ik) {
898 if (ik->has_been_redefined()) {
899 ik->purge_previous_version_list();
900 }
901 }
902
903 static bool has_previous_versions_and_reset();
904 static bool has_previous_versions() { return _has_previous_versions; }
905
906 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
907 void set_cached_class_file(JvmtiCachedClassFileData *data) {
908 _cached_class_file = data;
909 }
910 JvmtiCachedClassFileData * get_cached_class_file();
911 jint get_cached_class_file_len();
912 unsigned char * get_cached_class_file_bytes();
913
914 // JVMTI: Support for caching of field indices, types, and offsets
915 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
916 _jvmti_cached_class_field_map = descriptor;
917 }
918 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
919 return _jvmti_cached_class_field_map;
920 }
921 #else // INCLUDE_JVMTI
922
923 static void purge_previous_versions(InstanceKlass* ik) { return; };
924 static bool has_previous_versions_and_reset() { return false; }
925
926 void set_cached_class_file(JvmtiCachedClassFileData *data) {
927 assert(data == NULL, "unexpected call with JVMTI disabled");
928 }
929 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
930
931 #endif // INCLUDE_JVMTI
932
933 bool has_nonstatic_concrete_methods() const {
934 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
935 }
936 void set_has_nonstatic_concrete_methods(bool b) {
937 if (b) {
938 _misc_flags |= _misc_has_nonstatic_concrete_methods;
939 } else {
940 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
941 }
942 }
943
944 bool declares_nonstatic_concrete_methods() const {
945 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
946 }
947 void set_declares_nonstatic_concrete_methods(bool b) {
948 if (b) {
949 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
950 } else {
951 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
952 }
953 }
954
955 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
956 inline u2 next_method_idnum();
957 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
958
959 // generics support
960 Symbol* generic_signature() const {
961 return (_generic_signature_index == 0) ?
962 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
963 }
964 u2 generic_signature_index() const {
965 return _generic_signature_index;
966 }
967 void set_generic_signature_index(u2 sig_index) {
968 _generic_signature_index = sig_index;
969 }
970
971 u2 enclosing_method_data(int offset) const;
972 u2 enclosing_method_class_index() const {
973 return enclosing_method_data(enclosing_method_class_index_offset);
974 }
975 u2 enclosing_method_method_index() {
976 return enclosing_method_data(enclosing_method_method_index_offset);
977 }
978 void set_enclosing_method_indices(u2 class_index,
979 u2 method_index);
980
981 // jmethodID support
982 jmethodID get_jmethod_id(const methodHandle& method_h);
983 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
984 jmethodID new_id, jmethodID* new_jmeths,
985 jmethodID* to_dealloc_id_p,
986 jmethodID** to_dealloc_jmeths_p);
987 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
988 size_t *length_p, jmethodID* id_p);
989 void ensure_space_for_methodids(int start_offset = 0);
990 jmethodID jmethod_id_or_null(Method* method);
991
992 // annotations support
993 Annotations* annotations() const { return _annotations; }
994 void set_annotations(Annotations* anno) { _annotations = anno; }
995
996 AnnotationArray* class_annotations() const {
997 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
998 }
999 Array<AnnotationArray*>* fields_annotations() const {
1000 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
1001 }
1002 AnnotationArray* class_type_annotations() const {
1003 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
1004 }
1005 Array<AnnotationArray*>* fields_type_annotations() const {
1006 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
1007 }
1008 // allocation
1009 instanceOop allocate_instance(TRAPS);
1010
1011 // additional member function to return a handle
1012 instanceHandle allocate_instance_handle(TRAPS);
1013
1014 objArrayOop allocate_objArray(int n, int length, TRAPS);
1015 // Helper function
1016 static instanceOop register_finalizer(instanceOop i, TRAPS);
1017
1018 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
1019 // if not, throw either an Error or an Exception.
1020 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
1021
1022 // initialization
1023 void call_class_initializer(TRAPS);
1024 void set_initialization_state_and_notify(ClassState state, TRAPS);
1025
1026 // OopMapCache support
1027 OopMapCache* oop_map_cache() { return _oop_map_cache; }
1028 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
1029 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
1030
1031 // JNI identifier support (for static fields - for jni performance)
1032 JNIid* jni_ids() { return _jni_ids; }
1033 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
1034 JNIid* jni_id_for(int offset);
1035
1036 // maintenance of deoptimization dependencies
1037 inline DependencyContext dependencies();
1038 int mark_dependent_nmethods(KlassDepChange& changes);
1039 void add_dependent_nmethod(nmethod* nm);
1040 void remove_dependent_nmethod(nmethod* nm);
1041 void clean_dependency_context();
1042
1043 // On-stack replacement support
1044 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1045 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1046 void add_osr_nmethod(nmethod* n);
1047 bool remove_osr_nmethod(nmethod* n);
1048 int mark_osr_nmethods(const Method* m);
1049 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1050
1051 #if INCLUDE_JVMTI
1052 // Breakpoint support (see methods on Method* for details)
1053 BreakpointInfo* breakpoints() const { return _breakpoints; };
1054 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1055 #endif
1056
1057 // support for stub routines
1058 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1059 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1060 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1061
1062 static ByteSize adr_valueklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_valueklass_fixed_block)); }
1063
1064 // subclass/subinterface checks
1065 bool implements_interface(Klass* k) const;
1066 bool is_same_or_direct_interface(Klass* k) const;
1067
1068 #ifdef ASSERT
1069 // check whether this class or one of its superclasses was redefined
1070 bool has_redefined_this_or_super() const;
1071 #endif
1072
1073 // Access to the implementor of an interface.
1074 Klass* implementor() const;
1075 void set_implementor(Klass* k);
1076 int nof_implementors() const;
1077 void add_implementor(Klass* k); // k is a new class that implements this interface
1078 void init_implementor(); // initialize
1079
1080 // link this class into the implementors list of every interface it implements
1081 void process_interfaces(Thread *thread);
1082
1083 // virtual operations from Klass
1084 bool is_leaf_class() const { return _subklass == NULL; }
1085 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1086 Array<InstanceKlass*>* transitive_interfaces);
1087 bool can_be_primary_super_slow() const;
1088 int oop_size(oop obj) const { return size_helper(); }
1089 // slow because it's a virtual call and used for verifying the layout_helper.
1090 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1091 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1092
1093 // Iterators
1094 void do_local_static_fields(FieldClosure* cl);
1095 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1096 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1097
1098 void methods_do(void f(Method* method));
1099 void array_klasses_do(void f(Klass* k));
1100 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1101 bool super_types_do(SuperTypeClosure* blk);
1102
1103 static InstanceKlass* cast(Klass* k) {
1104 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1105 }
1106
1107 static const InstanceKlass* cast(const Klass* k) {
1108 assert(k != NULL, "k should not be null");
1109 assert(k->is_instance_klass(), "cast to InstanceKlass");
1110 return static_cast<const InstanceKlass*>(k);
1111 }
1112
1113 virtual InstanceKlass* java_super() const {
1114 return (super() == NULL) ? NULL : cast(super());
1115 }
1116
1117 // Sizing (in words)
1118 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1119
1120 static int size(int vtable_length, int itable_length,
1121 int nonstatic_oop_map_size,
1122 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint,
1123 int java_fields, bool is_value_type) {
1124 return align_metadata_size(header_size() +
1125 vtable_length +
1126 itable_length +
1127 nonstatic_oop_map_size +
1128 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1129 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1130 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1131 (java_fields * (int)sizeof(Klass*)/wordSize) +
1132 (is_value_type ? (int)sizeof(ValueKlassFixedBlock) : 0));
1133 }
1134 int size() const { return size(vtable_length(),
1135 itable_length(),
1136 nonstatic_oop_map_size(),
1137 is_interface(),
1138 is_unsafe_anonymous(),
1139 has_stored_fingerprint(),
1140 has_value_fields() ? java_fields_count() : 0,
1141 is_value());
1142 }
1143 #if INCLUDE_SERVICES
1144 virtual void collect_statistics(KlassSizeStats *sz) const;
1145 #endif
1146
1147 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1148 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1149
1150 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1151
1152 oop static_field_base_raw() { return java_mirror(); }
1153
1154 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1155
1156 OopMapBlock* start_of_nonstatic_oop_maps() const {
1157 return (OopMapBlock*)(start_of_itable() + itable_length());
1158 }
1159
1160 Klass** end_of_nonstatic_oop_maps() const {
1161 return (Klass**)(start_of_nonstatic_oop_maps() +
1162 nonstatic_oop_map_count());
1163 }
1164
1165 Klass* volatile* adr_implementor() const {
1166 if (is_interface()) {
1167 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1168 } else {
1169 return NULL;
1170 }
1171 };
1172
1173 InstanceKlass** adr_unsafe_anonymous_host() const {
1174 if (is_unsafe_anonymous()) {
1175 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1176 if (adr_impl != NULL) {
1177 return adr_impl + 1;
1178 } else {
1179 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1180 }
1181 } else {
1182 return NULL;
1183 }
1184 }
1185
1186 address adr_fingerprint() const {
1187 if (has_stored_fingerprint()) {
1188 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1189 if (adr_host != NULL) {
1190 return (address)(adr_host + 1);
1191 }
1192
1193 Klass* volatile* adr_impl = adr_implementor();
1194 if (adr_impl != NULL) {
1195 return (address)(adr_impl + 1);
1196 }
1197
1198 return (address)end_of_nonstatic_oop_maps();
1199 } else {
1200 return NULL;
1201 }
1202 }
1203
1204 address adr_value_fields_klasses() const {
1205 if (has_value_fields()) {
1206 address adr_fing = adr_fingerprint();
1207 if (adr_fing != NULL) {
1208 return adr_fingerprint() + sizeof(u8);
1209 }
1210
1211 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1212 if (adr_host != NULL) {
1213 return (address)(adr_host + 1);
1214 }
1215
1216 Klass* volatile* adr_impl = adr_implementor();
1217 if (adr_impl != NULL) {
1218 return (address)(adr_impl + 1);
1219 }
1220
1221 return (address)end_of_nonstatic_oop_maps();
1222 } else {
1223 return NULL;
1224 }
1225 }
1226
1227 Klass* get_value_field_klass(int idx) const {
1228 assert(has_value_fields(), "Sanity checking");
1229 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1230 assert(k != NULL, "Should always be set before being read");
1231 assert(k->is_value(), "Must be a value type");
1232 return k;
1233 }
1234
1235 Klass* get_value_field_klass_or_null(int idx) const {
1236 assert(has_value_fields(), "Sanity checking");
1237 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1238 assert(k == NULL || k->is_value(), "Must be a value type");
1239 return k;
1240 }
1241
1242 void set_value_field_klass(int idx, Klass* k) {
1243 assert(has_value_fields(), "Sanity checking");
1244 assert(k != NULL, "Should not be set to NULL");
1245 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1246 ((Klass**)adr_value_fields_klasses())[idx] = k;
1247 }
1248
1249 // Use this to return the size of an instance in heap words:
1250 virtual int size_helper() const {
1251 return layout_helper_to_size_helper(layout_helper());
1252 }
1253
1254 // This bit is initialized in classFileParser.cpp.
1255 // It is false under any of the following conditions:
1256 // - the class is abstract (including any interface)
1257 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1258 // - the class size is larger than FastAllocateSizeLimit
1259 // - the class is java/lang/Class, which cannot be allocated directly
1260 bool can_be_fastpath_allocated() const {
1261 return !layout_helper_needs_slow_path(layout_helper());
1262 }
1263
1264 // Java itable
1265 klassItable itable() const; // return klassItable wrapper
1266 Method* method_at_itable(Klass* holder, int index, TRAPS);
1267
1268 #if INCLUDE_JVMTI
1269 void adjust_default_methods(bool* trace_name_printed);
1270 #endif // INCLUDE_JVMTI
1271
1272 void clean_weak_instanceklass_links();
1273 private:
1274 void clean_implementors_list();
1275 void clean_method_data();
1276
1277 public:
1278 // Explicit metaspace deallocation of fields
1279 // For RedefineClasses and class file parsing errors, we need to deallocate
1280 // instanceKlasses and the metadata they point to.
1281 void deallocate_contents(ClassLoaderData* loader_data);
1282 static void deallocate_methods(ClassLoaderData* loader_data,
1283 Array<Method*>* methods);
1284 void static deallocate_interfaces(ClassLoaderData* loader_data,
1285 const Klass* super_klass,
1286 Array<InstanceKlass*>* local_interfaces,
1287 Array<InstanceKlass*>* transitive_interfaces);
1288
1289 // The constant pool is on stack if any of the methods are executing or
1290 // referenced by handles.
1291 bool on_stack() const { return _constants->on_stack(); }
1292
1293 // callbacks for actions during class unloading
1294 static void unload_class(InstanceKlass* ik);
1295 static void release_C_heap_structures(InstanceKlass* ik);
1296
1297 // Naming
1298 const char* signature_name() const;
1299 const char* signature_name_of(char c) const;
1300 static Symbol* package_from_name(const Symbol* name, TRAPS);
1301
1302 // Oop fields (and metadata) iterators
1303 //
1304 // The InstanceKlass iterators also visits the Object's klass.
1305
1306 // Forward iteration
1307 public:
1308 // Iterate over all oop fields in the oop maps.
1309 template <typename T, class OopClosureType>
1310 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1311
1312 // Iterate over all oop fields and metadata.
1313 template <typename T, class OopClosureType>
1314 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1315
1316 // Iterate over all oop fields in one oop map.
1317 template <typename T, class OopClosureType>
1318 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1319
1320
1321 // Reverse iteration
1322 // Iterate over all oop fields and metadata.
1323 template <typename T, class OopClosureType>
1324 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1325
1326 private:
1327 // Iterate over all oop fields in the oop maps.
1328 template <typename T, class OopClosureType>
1329 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1330
1331 // Iterate over all oop fields in one oop map.
1332 template <typename T, class OopClosureType>
1333 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1334
1335
1336 // Bounded range iteration
1337 public:
1338 // Iterate over all oop fields in the oop maps.
1339 template <typename T, class OopClosureType>
1340 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1341
1342 // Iterate over all oop fields and metadata.
1343 template <typename T, class OopClosureType>
1344 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1345
1346 private:
1347 // Iterate over all oop fields in one oop map.
1348 template <typename T, class OopClosureType>
1349 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1350
1351
1352 public:
1353 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1354
1355 public:
1356 void set_in_error_state() {
1357 assert(DumpSharedSpaces, "only call this when dumping archive");
1358 _init_state = initialization_error;
1359 }
1360 bool check_sharing_error_state();
1361
1362 private:
1363 // initialization state
1364 void set_init_state(ClassState state);
1365 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1366 void set_init_thread(Thread *thread) { _init_thread = thread; }
1367
1368 // The RedefineClasses() API can cause new method idnums to be needed
1369 // which will cause the caches to grow. Safety requires different
1370 // cache management logic if the caches can grow instead of just
1371 // going from NULL to non-NULL.
1372 bool idnum_can_increment() const { return has_been_redefined(); }
1373 inline jmethodID* methods_jmethod_ids_acquire() const;
1374 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1375
1376 // Lock during initialization
1377 public:
1378 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1379 // Must be one per class and it has to be a VM internal object so java code
1380 // cannot lock it (like the mirror).
1381 // It has to be an object not a Mutex because it's held through java calls.
1382 oop init_lock() const;
1383 private:
1384 void fence_and_clear_init_lock();
1385
1386 bool link_class_impl (TRAPS);
1387 bool verify_code (TRAPS);
1388 void initialize_impl (TRAPS);
1389 void initialize_super_interfaces (TRAPS);
1390 void eager_initialize_impl ();
1391 /* jni_id_for_impl for jfieldID only */
1392 JNIid* jni_id_for_impl (int offset);
1393 protected:
1394 // Returns the array class for the n'th dimension
1395 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
1396
1397 // Returns the array class with this class as element type
1398 virtual Klass* array_klass_impl(bool or_null, TRAPS);
1399
1400 private:
1401
1402 // find a local method (returns NULL if not found)
1403 Method* find_method_impl(const Symbol* name,
1404 const Symbol* signature,
1405 OverpassLookupMode overpass_mode,
1406 StaticLookupMode static_mode,
1407 PrivateLookupMode private_mode) const;
1408
1409 static Method* find_method_impl(const Array<Method*>* methods,
1410 const Symbol* name,
1411 const Symbol* signature,
1412 OverpassLookupMode overpass_mode,
1413 StaticLookupMode static_mode,
1414 PrivateLookupMode private_mode);
1415
1416 // Free CHeap allocated fields.
1417 void release_C_heap_structures();
1418
1419 #if INCLUDE_JVMTI
1420 // RedefineClasses support
1421 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1422 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1423 #endif
1424 public:
1425 // CDS support - remove and restore oops from metadata. Oops are not shared.
1426 virtual void remove_unshareable_info();
1427 virtual void remove_java_mirror();
1428 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1429
1430 // jvm support
1431 jint compute_modifier_flags(TRAPS) const;
1432
1433 public:
1434 // JVMTI support
1435 jint jvmti_class_status() const;
1436
1437 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1438
1439 public:
1440 // Printing
1441 #ifndef PRODUCT
1442 void print_on(outputStream* st) const;
1443 #endif
1444 void print_value_on(outputStream* st) const;
1445
1446 void oop_print_value_on(oop obj, outputStream* st);
1447
1448 #ifndef PRODUCT
1449 void oop_print_on (oop obj, outputStream* st);
1450
1451 void print_dependent_nmethods(bool verbose = false);
1452 bool is_dependent_nmethod(nmethod* nm);
1453 bool verify_itable_index(int index);
1454 #endif
1455
1456 const char* internal_name() const;
1457
1458 // Verification
1459 void verify_on(outputStream* st);
1460
1461 void oop_verify_on(oop obj, outputStream* st);
1462
1463 // Logging
1464 void print_class_load_logging(ClassLoaderData* loader_data,
1465 const char* module_name,
1466 const ClassFileStream* cfs) const;
1467 };
1468
1469 // for adding methods
1470 // UNSET_IDNUM return means no more ids available
1471 inline u2 InstanceKlass::next_method_idnum() {
1472 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1473 return ConstMethod::UNSET_IDNUM; // no more ids available
1474 } else {
1475 return _idnum_allocated_count++;
1476 }
1477 }
1478
1479
1480 /* JNIid class for jfieldIDs only */
1481 class JNIid: public CHeapObj<mtClass> {
1482 friend class VMStructs;
1483 private:
1484 Klass* _holder;
1485 JNIid* _next;
1486 int _offset;
1487 #ifdef ASSERT
1488 bool _is_static_field_id;
1489 #endif
1490
1491 public:
1492 // Accessors
1493 Klass* holder() const { return _holder; }
1494 int offset() const { return _offset; }
1495 JNIid* next() { return _next; }
1496 // Constructor
1497 JNIid(Klass* holder, int offset, JNIid* next);
1498 // Identifier lookup
1499 JNIid* find(int offset);
1500
1501 bool find_local_field(fieldDescriptor* fd) {
1502 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1503 }
1504
1505 static void deallocate(JNIid* id);
1506 // Debugging
1507 #ifdef ASSERT
1508 bool is_static_field_id() const { return _is_static_field_id; }
1509 void set_is_static_field_id() { _is_static_field_id = true; }
1510 #endif
1511 void verify(Klass* holder);
1512 };
1513
1514 // An iterator that's used to access the inner classes indices in the
1515 // InstanceKlass::_inner_classes array.
1516 class InnerClassesIterator : public StackObj {
1517 private:
1518 Array<jushort>* _inner_classes;
1519 int _length;
1520 int _idx;
1521 public:
1522
1523 InnerClassesIterator(const InstanceKlass* k) {
1524 _inner_classes = k->inner_classes();
1525 if (k->inner_classes() != NULL) {
1526 _length = _inner_classes->length();
1527 // The inner class array's length should be the multiple of
1528 // inner_class_next_offset if it only contains the InnerClasses
1529 // attribute data, or it should be
1530 // n*inner_class_next_offset+enclosing_method_attribute_size
1531 // if it also contains the EnclosingMethod data.
1532 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1533 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1534 "just checking");
1535 // Remove the enclosing_method portion if exists.
1536 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1537 _length -= InstanceKlass::enclosing_method_attribute_size;
1538 }
1539 } else {
1540 _length = 0;
1541 }
1542 _idx = 0;
1543 }
1544
1545 int length() const {
1546 return _length;
1547 }
1548
1549 void next() {
1550 _idx += InstanceKlass::inner_class_next_offset;
1551 }
1552
1553 bool done() const {
1554 return (_idx >= _length);
1555 }
1556
1557 u2 inner_class_info_index() const {
1558 return _inner_classes->at(
1559 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1560 }
1561
1562 void set_inner_class_info_index(u2 index) {
1563 _inner_classes->at_put(
1564 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1565 }
1566
1567 u2 outer_class_info_index() const {
1568 return _inner_classes->at(
1569 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1570 }
1571
1572 void set_outer_class_info_index(u2 index) {
1573 _inner_classes->at_put(
1574 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1575 }
1576
1577 u2 inner_name_index() const {
1578 return _inner_classes->at(
1579 _idx + InstanceKlass::inner_class_inner_name_offset);
1580 }
1581
1582 void set_inner_name_index(u2 index) {
1583 _inner_classes->at_put(
1584 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1585 }
1586
1587 u2 inner_access_flags() const {
1588 return _inner_classes->at(
1589 _idx + InstanceKlass::inner_class_access_flags_offset);
1590 }
1591 };
1592
1593 #endif // SHARE_OOPS_INSTANCEKLASS_HPP