1 /*
2 * Copyright (c) 1997, 2017, 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_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_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 "gc/shared/specialized_oop_closures.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 "trace/traceMacros.hpp"
42 #include "utilities/accessFlags.hpp"
43 #include "utilities/align.hpp"
44 #include "utilities/macros.hpp"
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 host klass ] only exist for an anonymous class (JSR 292 enabled)
56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
57
58
59 // forward declaration for class -- see below for definition
60 #if INCLUDE_JVMTI
61 class BreakpointInfo;
62 #endif
63 class ClassFileParser;
64 class KlassDepChange;
65 class DependencyContext;
66 class fieldDescriptor;
67 class jniIdMapBase;
68 class JNIid;
69 class JvmtiCachedClassFieldMap;
70 class SuperTypeClosure;
71 class BufferedValueTypeBlob;
72
73 // This is used in iterators below.
74 class FieldClosure: public StackObj {
75 public:
76 virtual void do_field(fieldDescriptor* fd) = 0;
77 };
78
79 #ifndef PRODUCT
80 // Print fields.
81 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
82 class FieldPrinter: public FieldClosure {
83 oop _obj;
84 outputStream* _st;
85 public:
86 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
87 void do_field(fieldDescriptor* fd);
88 };
89 #endif // !PRODUCT
90
91 // ValueObjs embedded in klass. Describes where oops are located in instances of
92 // this klass.
93 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
94 public:
95 // Byte offset of the first oop mapped by this block.
96 int offset() const { return _offset; }
97 void set_offset(int offset) { _offset = offset; }
98
99 // Number of oops in this block.
100 uint count() const { return _count; }
101 void set_count(uint count) { _count = count; }
102
103 void increment_count(int diff) { _count += diff; }
104
105 int offset_span() const { return _count * heapOopSize; }
106
107 int end_offset() const {
108 return offset() + offset_span();
109 }
110
111 bool is_contiguous(int another_offset) const {
112 return another_offset == end_offset();
113 }
114
115 // sizeof(OopMapBlock) in words.
116 static const int size_in_words() {
117 return align_up((int)sizeof(OopMapBlock), wordSize) >>
118 LogBytesPerWord;
119 }
120
121 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
122 return a->offset() - b->offset();
123 }
124
125 private:
126 int _offset;
127 uint _count;
128 };
129
130 struct JvmtiCachedClassFileData;
131
132 class InstanceKlass: public Klass {
133 friend class VMStructs;
134 friend class JVMCIVMStructs;
135 friend class ClassFileParser;
136 friend class CompileReplay;
137
138 protected:
139 InstanceKlass(const ClassFileParser& parser, unsigned kind);
140
141 public:
142 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
143
144 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
145 // of the class loading & initialization procedure, and the use of the states.
146 enum ClassState {
147 allocated, // allocated (but not yet linked)
148 loaded, // loaded and inserted in class hierarchy (but not linked yet)
149 linked, // successfully linked/verified (but not initialized yet)
150 being_initialized, // currently running class initializer
151 fully_initialized, // initialized (successfull final state)
152 initialization_error // error happened during initialization
153 };
154
155 static int number_of_instance_classes() { return _total_instanceKlass_count; }
156
157 private:
158 static volatile int _total_instanceKlass_count;
159 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
160
161 protected:
162 // If you add a new field that points to any metaspace object, you
163 // must add this field to InstanceKlass::metaspace_pointers_do().
164
165 // Annotations for this class
166 Annotations* _annotations;
167 // Package this class is defined in
168 PackageEntry* _package_entry;
169 // Array classes holding elements of this class.
170 Klass* volatile _array_klasses;
171 // Constant pool for this class.
172 ConstantPool* _constants;
173 // The InnerClasses attribute and EnclosingMethod attribute. The
174 // _inner_classes is an array of shorts. If the class has InnerClasses
175 // attribute, then the _inner_classes array begins with 4-tuples of shorts
176 // [inner_class_info_index, outer_class_info_index,
177 // inner_name_index, inner_class_access_flags] for the InnerClasses
178 // attribute. If the EnclosingMethod attribute exists, it occupies the
179 // last two shorts [class_index, method_index] of the array. If only
180 // the InnerClasses attribute exists, the _inner_classes array length is
181 // number_of_inner_classes * 4. If the class has both InnerClasses
182 // and EnclosingMethod attributes the _inner_classes array length is
183 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
184 Array<jushort>* _inner_classes;
185
186 // the source debug extension for this klass, NULL if not specified.
187 // Specified as UTF-8 string without terminating zero byte in the classfile,
188 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
189 const char* _source_debug_extension;
190 // Array name derived from this class which needs unreferencing
191 // if this class is unloaded.
192 Symbol* _array_name;
193
194 // Number of heapOopSize words used by non-static fields in this klass
195 // (including inherited fields but after header_size()).
196 int _nonstatic_field_size;
197 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
198 // Constant pool index to the utf8 entry of the Generic signature,
199 // or 0 if none.
200 u2 _generic_signature_index;
201 // Constant pool index to the utf8 entry for the name of source file
202 // containing this klass, 0 if not specified.
203 u2 _source_file_name_index;
204 u2 _static_oop_field_count;// number of static oop fields in this klass
205 u2 _java_fields_count; // The number of declared Java fields
206 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
207
208 int _itable_len; // length of Java itable (in words)
209 // _is_marked_dependent can be set concurrently, thus cannot be part of the
210 // _misc_flags.
211 bool _is_marked_dependent; // used for marking during flushing and deoptimization
212
213 public:
214 enum {
215 _extra_is_being_redefined = 1 << 0, // used for locking redefinition
216 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class
217 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty
218 _extra_is_bufferable = 1 << 3, // value can be buffered out side of the Java heap
219 _extra_has_vcc_klass = 1 << 4, // has a pointer to its Value Capable Class (MVT)
220 _extra_has_vcc_annotation = 1 << 5
221 };
222
223 protected:
224 u1 _extra_flags;
225
226 // The low three bits of _misc_flags contains the kind field.
227 // This can be used to quickly discriminate among the five kinds of
228 // InstanceKlass.
229
230 static const unsigned _misc_kind_field_size = 3;
231 static const unsigned _misc_kind_field_pos = 0;
232 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
233
234 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
235 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
236 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
237 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
238 static const unsigned _misc_kind_value_type = 4; // ValueKlass
239
240 // Start after _misc_kind field.
241 enum {
242 _misc_rewritten = 1 << 3, // methods rewritten.
243 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops
244 _misc_should_verify_class = 1 << 5, // allow caching of preverification
245 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field
246 _misc_is_contended = 1 << 7, // marked with contended annotation
247 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods
248 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods
249 _misc_has_been_redefined = 1 << 10, // class has been redefined
250 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its
251 // code source was found to be matching the value recorded by AOT.
252 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class
253 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader
254 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader
255 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader
256 // u2 _misc_flags full (see _extra_flags)
257 };
258 u2 loader_type_bits() {
259 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
260 }
261 u2 _misc_flags;
262 u2 _minor_version; // minor version number of class file
263 u2 _major_version; // major version number of class file
264 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
265 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
266 JNIid* _jni_ids; // First JNI identifier for static fields in this class
267 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
268 intptr_t _dep_context; // packed DependencyContext structure
269 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
270 #if INCLUDE_JVMTI
271 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
272 // Linked instanceKlasses of previous versions
273 InstanceKlass* _previous_versions;
274 // JVMTI fields can be moved to their own structure - see 6315920
275 // JVMTI: cached class file, before retransformable agent modified it in CFLH
276 JvmtiCachedClassFileData* _cached_class_file;
277 #endif
278
279 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
280
281 // Class states are defined as ClassState (see above).
282 // Place the _init_state here to utilize the unused 2-byte after
283 // _idnum_allocated_count.
284 u1 _init_state; // state of class
285 u1 _reference_type; // reference type
286
287 #if INCLUDE_JVMTI
288 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
289 #endif
290
291 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
292
293 // Method array.
294 Array<Method*>* _methods;
295 // Default Method Array, concrete methods inherited from interfaces
296 Array<Method*>* _default_methods;
297 // Interface (Klass*s) this class declares locally to implement.
298 Array<Klass*>* _local_interfaces;
299 // Interface (Klass*s) this class implements transitively.
300 Array<Klass*>* _transitive_interfaces;
301 // Int array containing the original order of method in the class file (for JVMTI).
302 Array<int>* _method_ordering;
303 // Int array containing the vtable_indices for default_methods
304 // offset matches _default_methods offset
305 Array<int>* _default_vtable_indices;
306
307 // Instance and static variable information, starts with 6-tuples of shorts
308 // [access, name index, sig index, initval index, low_offset, high_offset]
309 // for all fields, followed by the generic signature data at the end of
310 // the array. Only fields with generic signature attributes have the generic
311 // signature data set in the array. The fields array looks like following:
312 //
313 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
314 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
315 // ...
316 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
317 // [generic signature index]
318 // [generic signature index]
319 // ...
320 Array<u2>* _fields;
321
322 // embedded Java vtable follows here
323 // embedded Java itables follows here
324 // embedded static fields follows here
325 // embedded nonstatic oop-map blocks follows here
326 // embedded implementor of this interface follows here
327 // The embedded implementor only exists if the current klass is an
328 // iterface. The possible values of the implementor fall into following
329 // three cases:
330 // NULL: no implementor.
331 // A Klass* that's not itself: one implementor.
332 // Itself: more than one implementors.
333 // embedded host klass follows here
334 // The embedded host klass only exists in an anonymous class for
335 // dynamic language support (JSR 292 enabled). The host class grants
336 // its access privileges to this class also. The host class is either
337 // named, or a previously loaded anonymous class. A non-anonymous class
338 // or an anonymous class loaded through normal classloading does not
339 // have this embedded field.
340 //
341
342 friend class SystemDictionary;
343
344 public:
345 u2 loader_type() {
346 return _misc_flags & loader_type_bits();
347 }
348
349 bool is_shared_boot_class() const {
350 return (_misc_flags & _misc_is_shared_boot_class) != 0;
351 }
352 bool is_shared_platform_class() const {
353 return (_misc_flags & _misc_is_shared_platform_class) != 0;
354 }
355 bool is_shared_app_class() const {
356 return (_misc_flags & _misc_is_shared_app_class) != 0;
357 }
358
359 void set_class_loader_type(s2 loader_type) {
360 assert(( _misc_flags & loader_type_bits()) == 0,
361 "Should only be called once for each class.");
362 switch (loader_type) {
363 case ClassLoader::BOOT_LOADER:
364 _misc_flags |= _misc_is_shared_boot_class;
365 break;
366 case ClassLoader::PLATFORM_LOADER:
367 _misc_flags |= _misc_is_shared_platform_class;
368 break;
369 case ClassLoader::APP_LOADER:
370 _misc_flags |= _misc_is_shared_app_class;
371 break;
372 default:
373 ShouldNotReachHere();
374 break;
375 }
376 }
377
378 bool has_nonstatic_fields() const {
379 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
380 }
381 void set_has_nonstatic_fields(bool b) {
382 if (b) {
383 _misc_flags |= _misc_has_nonstatic_fields;
384 } else {
385 _misc_flags &= ~_misc_has_nonstatic_fields;
386 }
387 }
388
389 bool has_value_fields() const {
390 return (_extra_flags & _extra_has_value_fields) != 0;
391 }
392 void set_has_value_fields() {
393 _extra_flags |= _extra_has_value_fields;
394 }
395
396 bool has_vcc_klass() const {
397 return (_extra_flags & _extra_has_vcc_klass) != 0;
398 }
399 void set_has_vcc_klass() {
400 _extra_flags |= _extra_has_vcc_klass;
401 }
402
403 bool has_vcc_annotation() const {
404 return (_extra_flags &_extra_has_vcc_annotation) != 0;
405 }
406
407 void set_has_vcc_annotation() {
408 _extra_flags |= _extra_has_vcc_annotation;
409 }
410
411 // field sizes
412 int nonstatic_field_size() const { return _nonstatic_field_size; }
413 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
414
415 int static_field_size() const { return _static_field_size; }
416 void set_static_field_size(int size) { _static_field_size = size; }
417
418 int static_oop_field_count() const { return (int)_static_oop_field_count; }
419 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
420
421 // Java itable
422 int itable_length() const { return _itable_len; }
423 void set_itable_length(int len) { _itable_len = len; }
424
425 // array klasses
426 Klass* array_klasses() const { return _array_klasses; }
427 inline Klass* array_klasses_acquire() const; // load with acquire semantics
428 void set_array_klasses(Klass* k) { _array_klasses = k; }
429 inline void release_set_array_klasses(Klass* k); // store with release semantics
430
431 // methods
432 Array<Method*>* methods() const { return _methods; }
433 void set_methods(Array<Method*>* a) { _methods = a; }
434 Method* method_with_idnum(int idnum);
435 Method* method_with_orig_idnum(int idnum);
436 Method* method_with_orig_idnum(int idnum, int version);
437
438 // method ordering
439 Array<int>* method_ordering() const { return _method_ordering; }
440 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
441 void copy_method_ordering(const intArray* m, TRAPS);
442
443 // default_methods
444 Array<Method*>* default_methods() const { return _default_methods; }
445 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
446
447 // default method vtable_indices
448 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
449 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
450 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
451
452 // interfaces
453 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
454 void set_local_interfaces(Array<Klass*>* a) {
455 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
456 _local_interfaces = a; }
457
458 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
459 void set_transitive_interfaces(Array<Klass*>* a) {
460 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
461 _transitive_interfaces = a;
462 }
463
464 private:
465 friend class fieldDescriptor;
466 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
467
468 public:
469 int field_offset (int index) const { return field(index)->offset(); }
470 bool field_flattened (int index) const { return field(index)->is_flatten(); }
471 int field_access_flags(int index) const { return field(index)->access_flags(); }
472 Symbol* field_name (int index) const { return field(index)->name(constants()); }
473 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
474 bool is_field_flatten (int index) const { return field(index)->is_flatten(); }
475
476 // Number of Java declared fields
477 int java_fields_count() const { return (int)_java_fields_count; }
478
479 Array<u2>* fields() const { return _fields; }
480 void set_fields(Array<u2>* f, u2 java_fields_count) {
481 guarantee(_fields == NULL || f == NULL, "Just checking");
482 _fields = f;
483 _java_fields_count = java_fields_count;
484 }
485
486 // inner classes
487 Array<u2>* inner_classes() const { return _inner_classes; }
488 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
489
490 enum InnerClassAttributeOffset {
491 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
492 inner_class_inner_class_info_offset = 0,
493 inner_class_outer_class_info_offset = 1,
494 inner_class_inner_name_offset = 2,
495 inner_class_access_flags_offset = 3,
496 inner_class_next_offset = 4
497 };
498
499 enum EnclosingMethodAttributeOffset {
500 enclosing_method_class_index_offset = 0,
501 enclosing_method_method_index_offset = 1,
502 enclosing_method_attribute_size = 2
503 };
504
505 // method override check
506 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
507
508 // package
509 PackageEntry* package() const { return _package_entry; }
510 ModuleEntry* module() const;
511 bool in_unnamed_package() const { return (_package_entry == NULL); }
512 void set_package(PackageEntry* p) { _package_entry = p; }
513 void set_package(ClassLoaderData* loader_data, TRAPS);
514 bool is_same_class_package(const Klass* class2) const;
515 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
516
517 // find an enclosing class
518 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
519
520 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
521 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
522
523 private:
524 // Check prohibited package ("java/" only loadable by boot or platform loaders)
525 static void check_prohibited_package(Symbol* class_name,
526 Handle class_loader,
527 TRAPS);
528 public:
529 // tell if two classes have the same enclosing class (at package level)
530 bool is_same_package_member(const Klass* class2, TRAPS) const;
531
532 // initialization state
533 bool is_loaded() const { return _init_state >= loaded; }
534 bool is_linked() const { return _init_state >= linked; }
535 bool is_initialized() const { return _init_state == fully_initialized; }
536 bool is_not_initialized() const { return _init_state < being_initialized; }
537 bool is_being_initialized() const { return _init_state == being_initialized; }
538 bool is_in_error_state() const { return _init_state == initialization_error; }
539 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
540 ClassState init_state() { return (ClassState)_init_state; }
541 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
542
543 // defineClass specified verification
544 bool should_verify_class() const {
545 return (_misc_flags & _misc_should_verify_class) != 0;
546 }
547 void set_should_verify_class(bool value) {
548 if (value) {
549 _misc_flags |= _misc_should_verify_class;
550 } else {
551 _misc_flags &= ~_misc_should_verify_class;
552 }
553 }
554
555 // marking
556 bool is_marked_dependent() const { return _is_marked_dependent; }
557 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
558
559 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); }
560
561 // initialization (virtuals from Klass)
562 bool should_be_initialized() const; // means that initialize should be called
563 void initialize(TRAPS);
564 void link_class(TRAPS);
565 bool link_class_or_fail(TRAPS); // returns false on failure
566 void unlink_class();
567 void rewrite_class(TRAPS);
568 void link_methods(TRAPS);
569 Method* class_initializer() const;
570
571 // set the class to initialized if no static initializer is present
572 void eager_initialize(Thread *thread);
573
574 // reference type
575 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
576 void set_reference_type(ReferenceType t) {
577 assert(t == (u1)t, "overflow");
578 _reference_type = (u1)t;
579 }
580
581 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
582
583 // find local field, returns true if found
584 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
585 // find field in direct superinterfaces, returns the interface in which the field is defined
586 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
587 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
588 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
589 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
590 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
591
592 // find a non-static or static field given its offset within the class.
593 bool contains_field_offset(int offset) {
594 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value());
595 }
596
597 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
598 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
599
600 // find a local method (returns NULL if not found)
601 Method* find_method(const Symbol* name, const Symbol* signature) const;
602 static Method* find_method(const Array<Method*>* methods,
603 const Symbol* name,
604 const Symbol* signature);
605
606 // find a local method, but skip static methods
607 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
608 static Method* find_instance_method(const Array<Method*>* methods,
609 const Symbol* name,
610 const Symbol* signature);
611
612 // find a local method (returns NULL if not found)
613 Method* find_local_method(const Symbol* name,
614 const Symbol* signature,
615 OverpassLookupMode overpass_mode,
616 StaticLookupMode static_mode,
617 PrivateLookupMode private_mode) const;
618
619 // find a local method from given methods array (returns NULL if not found)
620 static Method* find_local_method(const Array<Method*>* methods,
621 const Symbol* name,
622 const Symbol* signature,
623 OverpassLookupMode overpass_mode,
624 StaticLookupMode static_mode,
625 PrivateLookupMode private_mode);
626
627 // find a local method index in methods or default_methods (returns -1 if not found)
628 static int find_method_index(const Array<Method*>* methods,
629 const Symbol* name,
630 const Symbol* signature,
631 OverpassLookupMode overpass_mode,
632 StaticLookupMode static_mode,
633 PrivateLookupMode private_mode);
634
635 // lookup operation (returns NULL if not found)
636 Method* uncached_lookup_method(const Symbol* name,
637 const Symbol* signature,
638 OverpassLookupMode overpass_mode) const;
639
640 // lookup a method in all the interfaces that this class implements
641 // (returns NULL if not found)
642 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
643
644 // lookup a method in local defaults then in all interfaces
645 // (returns NULL if not found)
646 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
647
648 // Find method indices by name. If a method with the specified name is
649 // found the index to the first method is returned, and 'end' is filled in
650 // with the index of first non-name-matching method. If no method is found
651 // -1 is returned.
652 int find_method_by_name(const Symbol* name, int* end) const;
653 static int find_method_by_name(const Array<Method*>* methods,
654 const Symbol* name, int* end);
655
656 // constant pool
657 ConstantPool* constants() const { return _constants; }
658 void set_constants(ConstantPool* c) { _constants = c; }
659
660 // protection domain
661 oop protection_domain() const;
662
663 // signers
664 objArrayOop signers() const;
665
666 // host class
667 InstanceKlass* host_klass() const {
668 InstanceKlass** hk = adr_host_klass();
669 if (hk == NULL) {
670 return NULL;
671 } else {
672 assert(*hk != NULL, "host klass should always be set if the address is not null");
673 return *hk;
674 }
675 }
676 void set_host_klass(const InstanceKlass* host) {
677 assert(is_anonymous(), "not anonymous");
678 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
679 assert(addr != NULL, "no reversed space");
680 if (addr != NULL) {
681 *addr = host;
682 }
683 }
684 bool is_anonymous() const {
685 return (_misc_flags & _misc_is_anonymous) != 0;
686 }
687 void set_is_anonymous(bool value) {
688 if (value) {
689 _misc_flags |= _misc_is_anonymous;
690 } else {
691 _misc_flags &= ~_misc_is_anonymous;
692 }
693 }
694
695 // Oop that keeps the metadata for this class from being unloaded
696 // in places where the metadata is stored in other places, like nmethods
697 oop klass_holder() const {
698 return is_anonymous() ? java_mirror() : class_loader();
699 }
700
701 bool is_contended() const {
702 return (_misc_flags & _misc_is_contended) != 0;
703 }
704 void set_is_contended(bool value) {
705 if (value) {
706 _misc_flags |= _misc_is_contended;
707 } else {
708 _misc_flags &= ~_misc_is_contended;
709 }
710 }
711
712 // source file name
713 Symbol* source_file_name() const {
714 return (_source_file_name_index == 0) ?
715 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
716 }
717 u2 source_file_name_index() const {
718 return _source_file_name_index;
719 }
720 void set_source_file_name_index(u2 sourcefile_index) {
721 _source_file_name_index = sourcefile_index;
722 }
723
724 // minor and major version numbers of class file
725 u2 minor_version() const { return _minor_version; }
726 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
727 u2 major_version() const { return _major_version; }
728 void set_major_version(u2 major_version) { _major_version = major_version; }
729
730 // source debug extension
731 const char* source_debug_extension() const { return _source_debug_extension; }
732 void set_source_debug_extension(const char* array, int length);
733
734 // symbol unloading support (refcount already added)
735 Symbol* array_name() { return _array_name; }
736 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
737
738 // nonstatic oop-map blocks
739 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
740 return oop_map_count * OopMapBlock::size_in_words();
741 }
742 unsigned int nonstatic_oop_map_count() const {
743 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
744 }
745 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
746 void set_nonstatic_oop_map_size(int words) {
747 _nonstatic_oop_map_size = words;
748 }
749
750 #if INCLUDE_JVMTI
751 // Redefinition locking. Class can only be redefined by one thread at a time.
752 bool is_being_redefined() const {
753 return (_extra_flags & _extra_is_being_redefined);
754 }
755 void set_is_being_redefined(bool value) {
756 if (value) {
757 _extra_flags |= _extra_is_being_redefined;
758 } else {
759 _extra_flags &= ~_extra_is_being_redefined;
760 }
761 }
762
763 // RedefineClasses() support for previous versions:
764 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
765 void purge_previous_version_list();
766
767 InstanceKlass* previous_versions() const { return _previous_versions; }
768 #else
769 InstanceKlass* previous_versions() const { return NULL; }
770 #endif
771
772 InstanceKlass* get_klass_version(int version) {
773 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
774 if (ik->constants()->version() == version) {
775 return ik;
776 }
777 }
778 return NULL;
779 }
780
781 bool has_been_redefined() const {
782 return (_misc_flags & _misc_has_been_redefined) != 0;
783 }
784 void set_has_been_redefined() {
785 _misc_flags |= _misc_has_been_redefined;
786 }
787
788 bool has_passed_fingerprint_check() const {
789 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
790 }
791 void set_has_passed_fingerprint_check(bool b) {
792 if (b) {
793 _misc_flags |= _misc_has_passed_fingerprint_check;
794 } else {
795 _misc_flags &= ~_misc_has_passed_fingerprint_check;
796 }
797 }
798 bool supers_have_passed_fingerprint_checks();
799
800 static bool should_store_fingerprint();
801 bool has_stored_fingerprint() const;
802 uint64_t get_stored_fingerprint() const;
803 void store_fingerprint(uint64_t fingerprint);
804
805 bool is_scratch_class() const {
806 return (_misc_flags & _misc_is_scratch_class) != 0;
807 }
808
809 void set_is_scratch_class() {
810 _misc_flags |= _misc_is_scratch_class;
811 }
812
813 bool has_resolved_methods() const {
814 return (_extra_flags & _extra_has_resolved_methods) != 0;
815 }
816
817 void set_has_resolved_methods() {
818 _extra_flags |= _extra_has_resolved_methods;
819 }
820 private:
821
822 void set_kind(unsigned kind) {
823 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
824 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
825 unsigned flags = _misc_flags & ~fmask;
826 _misc_flags = (flags | (kind << _misc_kind_field_pos));
827 }
828
829 bool is_kind(unsigned desired) const {
830 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
831 return kind == desired;
832 }
833
834 public:
835
836 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
837 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
838 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
839 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
840 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
841 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
842
843 #if INCLUDE_JVMTI
844
845 void init_previous_versions() {
846 _previous_versions = NULL;
847 }
848
849 private:
850 static bool _has_previous_versions;
851 public:
852 static void purge_previous_versions(InstanceKlass* ik) {
853 if (ik->has_been_redefined()) {
854 ik->purge_previous_version_list();
855 }
856 }
857
858 static bool has_previous_versions_and_reset();
859
860 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
861 void set_cached_class_file(JvmtiCachedClassFileData *data) {
862 _cached_class_file = data;
863 }
864 JvmtiCachedClassFileData * get_cached_class_file();
865 jint get_cached_class_file_len();
866 unsigned char * get_cached_class_file_bytes();
867
868 // JVMTI: Support for caching of field indices, types, and offsets
869 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
870 _jvmti_cached_class_field_map = descriptor;
871 }
872 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
873 return _jvmti_cached_class_field_map;
874 }
875
876 #if INCLUDE_CDS
877 void set_archived_class_data(JvmtiCachedClassFileData* data) {
878 _cached_class_file = data;
879 }
880
881 JvmtiCachedClassFileData * get_archived_class_data();
882 #endif // INCLUDE_CDS
883 #else // INCLUDE_JVMTI
884
885 static void purge_previous_versions(InstanceKlass* ik) { return; };
886 static bool has_previous_versions_and_reset() { return false; }
887
888 void set_cached_class_file(JvmtiCachedClassFileData *data) {
889 assert(data == NULL, "unexpected call with JVMTI disabled");
890 }
891 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
892
893 #endif // INCLUDE_JVMTI
894
895 bool has_nonstatic_concrete_methods() const {
896 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
897 }
898 void set_has_nonstatic_concrete_methods(bool b) {
899 if (b) {
900 _misc_flags |= _misc_has_nonstatic_concrete_methods;
901 } else {
902 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
903 }
904 }
905
906 bool declares_nonstatic_concrete_methods() const {
907 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
908 }
909 void set_declares_nonstatic_concrete_methods(bool b) {
910 if (b) {
911 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
912 } else {
913 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
914 }
915 }
916
917 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
918 inline u2 next_method_idnum();
919 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
920
921 // generics support
922 Symbol* generic_signature() const {
923 return (_generic_signature_index == 0) ?
924 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
925 }
926 u2 generic_signature_index() const {
927 return _generic_signature_index;
928 }
929 void set_generic_signature_index(u2 sig_index) {
930 _generic_signature_index = sig_index;
931 }
932
933 u2 enclosing_method_data(int offset) const;
934 u2 enclosing_method_class_index() const {
935 return enclosing_method_data(enclosing_method_class_index_offset);
936 }
937 u2 enclosing_method_method_index() {
938 return enclosing_method_data(enclosing_method_method_index_offset);
939 }
940 void set_enclosing_method_indices(u2 class_index,
941 u2 method_index);
942
943 // jmethodID support
944 jmethodID get_jmethod_id(const methodHandle& method_h);
945 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
946 jmethodID new_id, jmethodID* new_jmeths,
947 jmethodID* to_dealloc_id_p,
948 jmethodID** to_dealloc_jmeths_p);
949 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
950 size_t *length_p, jmethodID* id_p);
951 void ensure_space_for_methodids(int start_offset = 0);
952 jmethodID jmethod_id_or_null(Method* method);
953
954 // annotations support
955 Annotations* annotations() const { return _annotations; }
956 void set_annotations(Annotations* anno) { _annotations = anno; }
957
958 AnnotationArray* class_annotations() const {
959 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
960 }
961 Array<AnnotationArray*>* fields_annotations() const {
962 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
963 }
964 AnnotationArray* class_type_annotations() const {
965 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
966 }
967 Array<AnnotationArray*>* fields_type_annotations() const {
968 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
969 }
970 // allocation
971 instanceOop allocate_instance(TRAPS);
972
973 // additional member function to return a handle
974 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
975
976 objArrayOop allocate_objArray(int n, int length, TRAPS);
977 // Helper function
978 static instanceOop register_finalizer(instanceOop i, TRAPS);
979
980 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
981 // if not, throw either an Error or an Exception.
982 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
983
984 // initialization
985 void call_class_initializer(TRAPS);
986 void set_initialization_state_and_notify(ClassState state, TRAPS);
987
988 // OopMapCache support
989 OopMapCache* oop_map_cache() { return _oop_map_cache; }
990 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
991 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
992
993 // JNI identifier support (for static fields - for jni performance)
994 JNIid* jni_ids() { return _jni_ids; }
995 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
996 JNIid* jni_id_for(int offset);
997
998 // maintenance of deoptimization dependencies
999 inline DependencyContext dependencies();
1000 int mark_dependent_nmethods(KlassDepChange& changes);
1001 void add_dependent_nmethod(nmethod* nm);
1002 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
1003
1004 // On-stack replacement support
1005 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1006 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1007 void add_osr_nmethod(nmethod* n);
1008 bool remove_osr_nmethod(nmethod* n);
1009 int mark_osr_nmethods(const Method* m);
1010 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1011
1012 #if INCLUDE_JVMTI
1013 // Breakpoint support (see methods on Method* for details)
1014 BreakpointInfo* breakpoints() const { return _breakpoints; };
1015 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1016 #endif
1017
1018 // support for stub routines
1019 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1020 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
1021 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1022
1023 // subclass/subinterface checks
1024 bool implements_interface(Klass* k) const;
1025 bool is_same_or_direct_interface(Klass* k) const;
1026
1027 #ifdef ASSERT
1028 // check whether this class or one of its superclasses was redefined
1029 bool has_redefined_this_or_super() const;
1030 #endif
1031
1032 // Access to the implementor of an interface.
1033 Klass* implementor() const
1034 {
1035 Klass** k = adr_implementor();
1036 if (k == NULL) {
1037 return NULL;
1038 } else {
1039 return *k;
1040 }
1041 }
1042
1043 void set_implementor(Klass* k) {
1044 assert(is_interface(), "not interface");
1045 Klass** addr = adr_implementor();
1046 assert(addr != NULL, "null addr");
1047 if (addr != NULL) {
1048 *addr = k;
1049 }
1050 }
1051
1052 int nof_implementors() const {
1053 Klass* k = implementor();
1054 if (k == NULL) {
1055 return 0;
1056 } else if (k != this) {
1057 return 1;
1058 } else {
1059 return 2;
1060 }
1061 }
1062
1063 void add_implementor(Klass* k); // k is a new class that implements this interface
1064 void init_implementor(); // initialize
1065
1066 // link this class into the implementors list of every interface it implements
1067 void process_interfaces(Thread *thread);
1068
1069 // virtual operations from Klass
1070 bool is_leaf_class() const { return _subklass == NULL; }
1071 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1072 bool compute_is_subtype_of(Klass* k);
1073 bool can_be_primary_super_slow() const;
1074 int oop_size(oop obj) const { return size_helper(); }
1075 // slow because it's a virtual call and used for verifying the layout_helper.
1076 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1077 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1078
1079 // Iterators
1080 void do_local_static_fields(FieldClosure* cl);
1081 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1082 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1083
1084 void methods_do(void f(Method* method));
1085 void array_klasses_do(void f(Klass* k));
1086 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1087 bool super_types_do(SuperTypeClosure* blk);
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 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_anonymous, bool has_stored_fingerprint,
1109 int java_fields, bool is_value_type) {
1110 return align_metadata_size(header_size() +
1111 (is_value_type ? (int)sizeof(address) : 0) +
1112 (is_value_type ? (int)sizeof(address) : 0) +
1113 vtable_length +
1114 itable_length +
1115 nonstatic_oop_map_size +
1116 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1117 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1118 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1119 (java_fields * (int)sizeof(Klass*)/wordSize) +
1120 (is_value_type ? (int)sizeof(Klass*) : 0) +
1121 (is_value_type ? (int)sizeof(intptr_t)*2 : 0));
1122 }
1123 int size() const { return size(vtable_length(),
1124 itable_length(),
1125 nonstatic_oop_map_size(),
1126 is_interface(),
1127 is_anonymous(),
1128 has_stored_fingerprint(),
1129 has_value_fields() ? java_fields_count() : 0,
1130 is_value());
1131 }
1132 #if INCLUDE_SERVICES
1133 virtual void collect_statistics(KlassSizeStats *sz) const;
1134 #endif
1135
1136 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + (is_value() ? 2 : 0 ) + vtable_length(); }
1137 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1138
1139 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1140
1141 address static_field_addr(int offset);
1142
1143 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1144
1145 OopMapBlock* start_of_nonstatic_oop_maps() const {
1146 return (OopMapBlock*)(start_of_itable() + itable_length());
1147 }
1148
1149 Klass** end_of_nonstatic_oop_maps() const {
1150 return (Klass**)(start_of_nonstatic_oop_maps() +
1151 nonstatic_oop_map_count());
1152 }
1153
1154 Klass** adr_implementor() const {
1155 if (is_interface()) {
1156 return (Klass**)end_of_nonstatic_oop_maps();
1157 } else {
1158 return NULL;
1159 }
1160 };
1161
1162 InstanceKlass** adr_host_klass() const {
1163 if (is_anonymous()) {
1164 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1165 if (adr_impl != NULL) {
1166 return adr_impl + 1;
1167 } else {
1168 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1169 }
1170 } else {
1171 return NULL;
1172 }
1173 }
1174
1175 address adr_fingerprint() const {
1176 if (has_stored_fingerprint()) {
1177 InstanceKlass** adr_host = adr_host_klass();
1178 if (adr_host != NULL) {
1179 return (address)(adr_host + 1);
1180 }
1181
1182 Klass** adr_impl = adr_implementor();
1183 if (adr_impl != NULL) {
1184 return (address)(adr_impl + 1);
1185 }
1186
1187 return (address)end_of_nonstatic_oop_maps();
1188 } else {
1189 return NULL;
1190 }
1191 }
1192
1193 address adr_value_fields_klasses() const {
1194 if (has_value_fields()) {
1195 address adr_fing = adr_fingerprint();
1196 if (adr_fing != NULL) {
1197 return adr_fingerprint() + sizeof(u8);
1198 }
1199
1200 InstanceKlass** adr_host = adr_host_klass();
1201 if (adr_host != NULL) {
1202 return (address)(adr_host + 1);
1203 }
1204
1205 Klass** adr_impl = adr_implementor();
1206 if (adr_impl != NULL) {
1207 return (address)(adr_impl + 1);
1208 }
1209
1210 return (address)end_of_nonstatic_oop_maps();
1211 } else {
1212 return NULL;
1213 }
1214 }
1215
1216 address adr_vcc_klass() const {
1217 if (has_vcc_klass()) {
1218 address adr_jf = adr_value_fields_klasses();
1219 if (adr_jf != NULL) {
1220 return adr_jf + this->java_fields_count() * sizeof(Klass*);
1221 }
1222
1223 address adr_fing = adr_fingerprint();
1224 if (adr_fing != NULL) {
1225 return adr_fingerprint() + sizeof(u8);
1226 }
1227
1228 InstanceKlass** adr_host = adr_host_klass();
1229 if (adr_host != NULL) {
1230 return (address)(adr_host + 1);
1231 }
1232
1233 Klass** adr_impl = adr_implementor();
1234 if (adr_impl != NULL) {
1235 return (address)(adr_impl + 1);
1236 }
1237
1238 return (address)end_of_nonstatic_oop_maps();
1239 } else {
1240 return NULL;
1241 }
1242 }
1243
1244 Klass* get_value_field_klass(int idx) {
1245 assert(has_value_fields(), "Sanity checking");
1246 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1247 assert(k != NULL, "Should always be set before being read");
1248 assert(k->is_value(), "Must be a value type");
1249 return k;
1250 }
1251
1252 void set_value_field_klass(int idx, Klass* k) {
1253 assert(has_value_fields(), "Sanity checking");
1254 assert(k != NULL, "Should not be set to NULL");
1255 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1256 ((Klass**)adr_value_fields_klasses())[idx] = k;
1257 }
1258
1259 Klass* get_vcc_klass() const {
1260 if (has_vcc_klass()) {
1261 Klass* k = *(Klass**)adr_vcc_klass();
1262 assert(k == NULL || !k->is_value(), "Must not be a value type");
1263 return k;
1264 }
1265 return NULL;
1266 }
1267
1268 void set_vcc_klass(Klass* k) {
1269 assert(has_vcc_klass(), "Sanity checking");
1270 assert(k == NULL || !k->is_value(), "Must not be a value type");
1271 *(Klass**)adr_vcc_klass()= k;
1272 }
1273
1274 // Use this to return the size of an instance in heap words:
1275 virtual int size_helper() const {
1276 return layout_helper_to_size_helper(layout_helper());
1277 }
1278
1279 // This bit is initialized in classFileParser.cpp.
1280 // It is false under any of the following conditions:
1281 // - the class is abstract (including any interface)
1282 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1283 // - the class size is larger than FastAllocateSizeLimit
1284 // - the class is java/lang/Class, which cannot be allocated directly
1285 bool can_be_fastpath_allocated() const {
1286 return !layout_helper_needs_slow_path(layout_helper());
1287 }
1288
1289 // Java itable
1290 klassItable itable() const; // return klassItable wrapper
1291 Method* method_at_itable(Klass* holder, int index, TRAPS);
1292
1293 #if INCLUDE_JVMTI
1294 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1295 #endif // INCLUDE_JVMTI
1296
1297 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1298 void clean_implementors_list(BoolObjectClosure* is_alive);
1299 void clean_method_data(BoolObjectClosure* is_alive);
1300
1301 // Explicit metaspace deallocation of fields
1302 // For RedefineClasses and class file parsing errors, we need to deallocate
1303 // instanceKlasses and the metadata they point to.
1304 void deallocate_contents(ClassLoaderData* loader_data);
1305 static void deallocate_methods(ClassLoaderData* loader_data,
1306 Array<Method*>* methods);
1307 void static deallocate_interfaces(ClassLoaderData* loader_data,
1308 const Klass* super_klass,
1309 Array<Klass*>* local_interfaces,
1310 Array<Klass*>* transitive_interfaces);
1311
1312 // The constant pool is on stack if any of the methods are executing or
1313 // referenced by handles.
1314 bool on_stack() const { return _constants->on_stack(); }
1315
1316 // callbacks for actions during class unloading
1317 static void notify_unload_class(InstanceKlass* ik);
1318 static void release_C_heap_structures(InstanceKlass* ik);
1319
1320 // Naming
1321 const char* signature_name() const;
1322 static Symbol* package_from_name(const Symbol* name, TRAPS);
1323
1324 // GC specific object visitors
1325 //
1326 #if INCLUDE_ALL_GCS
1327 // Parallel Scavenge
1328 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1329 // Parallel Compact
1330 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1331 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1332 #endif
1333
1334 // Oop fields (and metadata) iterators
1335 // [nv = true] Use non-virtual calls to do_oop_nv.
1336 // [nv = false] Use virtual calls to do_oop.
1337 //
1338 // The InstanceKlass iterators also visits the Object's klass.
1339
1340 // Forward iteration
1341 public:
1342 // Iterate over all oop fields in the oop maps.
1343 template <bool nv, class OopClosureType>
1344 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1345
1346 protected:
1347 // Iterate over all oop fields and metadata.
1348 template <bool nv, class OopClosureType>
1349 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1350
1351 private:
1352 // Iterate over all oop fields in the oop maps.
1353 // Specialized for [T = oop] or [T = narrowOop].
1354 template <bool nv, typename T, class OopClosureType>
1355 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1356
1357 // Iterate over all oop fields in one oop map.
1358 template <bool nv, typename T, class OopClosureType>
1359 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1360
1361
1362 // Reverse iteration
1363 #if INCLUDE_ALL_GCS
1364 public:
1365 // Iterate over all oop fields in the oop maps.
1366 template <bool nv, class OopClosureType>
1367 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1368
1369 protected:
1370 // Iterate over all oop fields and metadata.
1371 template <bool nv, class OopClosureType>
1372 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1373
1374 private:
1375 // Iterate over all oop fields in the oop maps.
1376 // Specialized for [T = oop] or [T = narrowOop].
1377 template <bool nv, typename T, class OopClosureType>
1378 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1379
1380 // Iterate over all oop fields in one oop map.
1381 template <bool nv, typename T, class OopClosureType>
1382 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1383 #endif
1384
1385
1386 // Bounded range iteration
1387 public:
1388 // Iterate over all oop fields in the oop maps.
1389 template <bool nv, class OopClosureType>
1390 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1391
1392 protected:
1393 // Iterate over all oop fields and metadata.
1394 template <bool nv, class OopClosureType>
1395 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1396
1397 private:
1398 // Iterate over all oop fields in the oop maps.
1399 // Specialized for [T = oop] or [T = narrowOop].
1400 template <bool nv, typename T, class OopClosureType>
1401 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1402
1403 // Iterate over all oop fields in one oop map.
1404 template <bool nv, typename T, class OopClosureType>
1405 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1406
1407
1408 public:
1409
1410 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1411 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1412
1413 #if INCLUDE_ALL_GCS
1414 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1415 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1416 #endif // INCLUDE_ALL_GCS
1417
1418 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1419
1420 public:
1421 void set_in_error_state() {
1422 assert(DumpSharedSpaces, "only call this when dumping archive");
1423 _init_state = initialization_error;
1424 }
1425 bool check_sharing_error_state();
1426
1427 private:
1428 // initialization state
1429 #ifdef ASSERT
1430 void set_init_state(ClassState state);
1431 #else
1432 void set_init_state(ClassState state) { _init_state = (u1)state; }
1433 #endif
1434 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1435 void set_init_thread(Thread *thread) { _init_thread = thread; }
1436
1437 // The RedefineClasses() API can cause new method idnums to be needed
1438 // which will cause the caches to grow. Safety requires different
1439 // cache management logic if the caches can grow instead of just
1440 // going from NULL to non-NULL.
1441 bool idnum_can_increment() const { return has_been_redefined(); }
1442 inline jmethodID* methods_jmethod_ids_acquire() const;
1443 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1444
1445 // Lock during initialization
1446 public:
1447 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1448 // Must be one per class and it has to be a VM internal object so java code
1449 // cannot lock it (like the mirror).
1450 // It has to be an object not a Mutex because it's held through java calls.
1451 oop init_lock() const;
1452 private:
1453 void fence_and_clear_init_lock();
1454
1455 bool link_class_impl (bool throw_verifyerror, TRAPS);
1456 bool verify_code (bool throw_verifyerror, TRAPS);
1457 void initialize_impl (TRAPS);
1458 void initialize_super_interfaces (TRAPS);
1459 void eager_initialize_impl ();
1460 /* jni_id_for_impl for jfieldID only */
1461 JNIid* jni_id_for_impl (int offset);
1462 protected:
1463 // Returns the array class for the n'th dimension
1464 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
1465
1466 // Returns the array class with this class as element type
1467 virtual Klass* array_klass_impl(bool or_null, TRAPS);
1468
1469 private:
1470
1471 // find a local method (returns NULL if not found)
1472 Method* find_method_impl(const Symbol* name,
1473 const Symbol* signature,
1474 OverpassLookupMode overpass_mode,
1475 StaticLookupMode static_mode,
1476 PrivateLookupMode private_mode) const;
1477
1478 static Method* find_method_impl(const Array<Method*>* methods,
1479 const Symbol* name,
1480 const Symbol* signature,
1481 OverpassLookupMode overpass_mode,
1482 StaticLookupMode static_mode,
1483 PrivateLookupMode private_mode);
1484
1485 // Free CHeap allocated fields.
1486 void release_C_heap_structures();
1487
1488 #if INCLUDE_JVMTI
1489 // RedefineClasses support
1490 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1491 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1492 #endif
1493 public:
1494 // CDS support - remove and restore oops from metadata. Oops are not shared.
1495 virtual void remove_unshareable_info();
1496 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1497
1498 // jvm support
1499 jint compute_modifier_flags(TRAPS) const;
1500
1501 //Valhalla prototype ValueCapableClass
1502 void create_value_capable_class(Handle class_loader, Handle protection_domain, TRAPS);
1503
1504 public:
1505 // JVMTI support
1506 jint jvmti_class_status() const;
1507
1508 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1509
1510 public:
1511 // Printing
1512 #ifndef PRODUCT
1513 void print_on(outputStream* st) const;
1514 #endif
1515 void print_value_on(outputStream* st) const;
1516
1517 void oop_print_value_on(oop obj, outputStream* st);
1518
1519 #ifndef PRODUCT
1520 void oop_print_on (oop obj, outputStream* st);
1521
1522 void print_dependent_nmethods(bool verbose = false);
1523 bool is_dependent_nmethod(nmethod* nm);
1524 #endif
1525
1526 const char* internal_name() const;
1527
1528 // Verification
1529 void verify_on(outputStream* st);
1530
1531 void oop_verify_on(oop obj, outputStream* st);
1532
1533 // Logging
1534 void print_class_load_logging(ClassLoaderData* loader_data,
1535 const char* module_name,
1536 const ClassFileStream* cfs) const;
1537 };
1538
1539 // for adding methods
1540 // UNSET_IDNUM return means no more ids available
1541 inline u2 InstanceKlass::next_method_idnum() {
1542 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1543 return ConstMethod::UNSET_IDNUM; // no more ids available
1544 } else {
1545 return _idnum_allocated_count++;
1546 }
1547 }
1548
1549
1550 /* JNIid class for jfieldIDs only */
1551 class JNIid: public CHeapObj<mtClass> {
1552 friend class VMStructs;
1553 private:
1554 Klass* _holder;
1555 JNIid* _next;
1556 int _offset;
1557 #ifdef ASSERT
1558 bool _is_static_field_id;
1559 #endif
1560
1561 public:
1562 // Accessors
1563 Klass* holder() const { return _holder; }
1564 int offset() const { return _offset; }
1565 JNIid* next() { return _next; }
1566 // Constructor
1567 JNIid(Klass* holder, int offset, JNIid* next);
1568 // Identifier lookup
1569 JNIid* find(int offset);
1570
1571 bool find_local_field(fieldDescriptor* fd) {
1572 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1573 }
1574
1575 static void deallocate(JNIid* id);
1576 // Debugging
1577 #ifdef ASSERT
1578 bool is_static_field_id() const { return _is_static_field_id; }
1579 void set_is_static_field_id() { _is_static_field_id = true; }
1580 #endif
1581 void verify(Klass* holder);
1582 };
1583
1584 // An iterator that's used to access the inner classes indices in the
1585 // InstanceKlass::_inner_classes array.
1586 class InnerClassesIterator : public StackObj {
1587 private:
1588 Array<jushort>* _inner_classes;
1589 int _length;
1590 int _idx;
1591 public:
1592
1593 InnerClassesIterator(const InstanceKlass* k) {
1594 _inner_classes = k->inner_classes();
1595 if (k->inner_classes() != NULL) {
1596 _length = _inner_classes->length();
1597 // The inner class array's length should be the multiple of
1598 // inner_class_next_offset if it only contains the InnerClasses
1599 // attribute data, or it should be
1600 // n*inner_class_next_offset+enclosing_method_attribute_size
1601 // if it also contains the EnclosingMethod data.
1602 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1603 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1604 "just checking");
1605 // Remove the enclosing_method portion if exists.
1606 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1607 _length -= InstanceKlass::enclosing_method_attribute_size;
1608 }
1609 } else {
1610 _length = 0;
1611 }
1612 _idx = 0;
1613 }
1614
1615 int length() const {
1616 return _length;
1617 }
1618
1619 void next() {
1620 _idx += InstanceKlass::inner_class_next_offset;
1621 }
1622
1623 bool done() const {
1624 return (_idx >= _length);
1625 }
1626
1627 u2 inner_class_info_index() const {
1628 return _inner_classes->at(
1629 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1630 }
1631
1632 void set_inner_class_info_index(u2 index) {
1633 _inner_classes->at_put(
1634 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1635 }
1636
1637 u2 outer_class_info_index() const {
1638 return _inner_classes->at(
1639 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1640 }
1641
1642 void set_outer_class_info_index(u2 index) {
1643 _inner_classes->at_put(
1644 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1645 }
1646
1647 u2 inner_name_index() const {
1648 return _inner_classes->at(
1649 _idx + InstanceKlass::inner_class_inner_name_offset);
1650 }
1651
1652 void set_inner_name_index(u2 index) {
1653 _inner_classes->at_put(
1654 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1655 }
1656
1657 u2 inner_access_flags() const {
1658 return _inner_classes->at(
1659 _idx + InstanceKlass::inner_class_access_flags_offset);
1660 }
1661 };
1662
1663 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP