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 switch (loader_type) {
361 case ClassLoader::BOOT_LOADER:
362 _misc_flags |= _misc_is_shared_boot_class;
363 break;
364 case ClassLoader::PLATFORM_LOADER:
365 _misc_flags |= _misc_is_shared_platform_class;
366 break;
367 case ClassLoader::APP_LOADER:
368 _misc_flags |= _misc_is_shared_app_class;
369 break;
370 default:
371 ShouldNotReachHere();
372 break;
373 }
374 }
375
376 bool has_nonstatic_fields() const {
377 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
378 }
379 void set_has_nonstatic_fields(bool b) {
380 if (b) {
381 _misc_flags |= _misc_has_nonstatic_fields;
382 } else {
383 _misc_flags &= ~_misc_has_nonstatic_fields;
384 }
385 }
386
387 bool has_value_fields() const {
388 return (_extra_flags & _extra_has_value_fields) != 0;
389 }
390 void set_has_value_fields() {
391 _extra_flags |= _extra_has_value_fields;
392 }
393
394 bool has_vcc_klass() const {
395 return (_extra_flags & _extra_has_vcc_klass) != 0;
396 }
397 void set_has_vcc_klass() {
398 _extra_flags |= _extra_has_vcc_klass;
399 }
400
401 bool has_vcc_annotation() const {
402 return (_extra_flags &_extra_has_vcc_annotation) != 0;
403 }
404
405 void set_has_vcc_annotation() {
406 _extra_flags |= _extra_has_vcc_annotation;
407 }
408
409 // field sizes
410 int nonstatic_field_size() const { return _nonstatic_field_size; }
411 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
412
413 int static_field_size() const { return _static_field_size; }
414 void set_static_field_size(int size) { _static_field_size = size; }
415
416 int static_oop_field_count() const { return (int)_static_oop_field_count; }
417 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
418
419 // Java itable
420 int itable_length() const { return _itable_len; }
421 void set_itable_length(int len) { _itable_len = len; }
422
423 // array klasses
424 Klass* array_klasses() const { return _array_klasses; }
425 inline Klass* array_klasses_acquire() const; // load with acquire semantics
426 void set_array_klasses(Klass* k) { _array_klasses = k; }
427 inline void release_set_array_klasses(Klass* k); // store with release semantics
428
429 // methods
430 Array<Method*>* methods() const { return _methods; }
431 void set_methods(Array<Method*>* a) { _methods = a; }
432 Method* method_with_idnum(int idnum);
433 Method* method_with_orig_idnum(int idnum);
434 Method* method_with_orig_idnum(int idnum, int version);
435
436 // method ordering
437 Array<int>* method_ordering() const { return _method_ordering; }
438 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
439 void copy_method_ordering(const intArray* m, TRAPS);
440
441 // default_methods
442 Array<Method*>* default_methods() const { return _default_methods; }
443 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
444
445 // default method vtable_indices
446 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
447 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
448 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
449
450 // interfaces
451 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
452 void set_local_interfaces(Array<Klass*>* a) {
453 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
454 _local_interfaces = a; }
455
456 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
457 void set_transitive_interfaces(Array<Klass*>* a) {
458 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
459 _transitive_interfaces = a;
460 }
461
462 private:
463 friend class fieldDescriptor;
464 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
465
466 public:
467 int field_offset (int index) const { return field(index)->offset(); }
468 bool field_flattened (int index) const { return field(index)->is_flatten(); }
469 int field_access_flags(int index) const { return field(index)->access_flags(); }
470 Symbol* field_name (int index) const { return field(index)->name(constants()); }
471 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
472 bool is_field_flatten (int index) const { return field(index)->is_flatten(); }
473
474 // Number of Java declared fields
475 int java_fields_count() const { return (int)_java_fields_count; }
476
477 Array<u2>* fields() const { return _fields; }
478 void set_fields(Array<u2>* f, u2 java_fields_count) {
479 guarantee(_fields == NULL || f == NULL, "Just checking");
480 _fields = f;
481 _java_fields_count = java_fields_count;
482 }
483
484 // inner classes
485 Array<u2>* inner_classes() const { return _inner_classes; }
486 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
487
488 enum InnerClassAttributeOffset {
489 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
490 inner_class_inner_class_info_offset = 0,
491 inner_class_outer_class_info_offset = 1,
492 inner_class_inner_name_offset = 2,
493 inner_class_access_flags_offset = 3,
494 inner_class_next_offset = 4
495 };
496
497 enum EnclosingMethodAttributeOffset {
498 enclosing_method_class_index_offset = 0,
499 enclosing_method_method_index_offset = 1,
500 enclosing_method_attribute_size = 2
501 };
502
503 // method override check
504 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
505
506 // package
507 PackageEntry* package() const { return _package_entry; }
508 ModuleEntry* module() const;
509 bool in_unnamed_package() const { return (_package_entry == NULL); }
510 void set_package(PackageEntry* p) { _package_entry = p; }
511 void set_package(ClassLoaderData* loader_data, TRAPS);
512 bool is_same_class_package(const Klass* class2) const;
513 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
514
515 // find an enclosing class
516 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
517
518 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
519 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
520
521 private:
522 // Check prohibited package ("java/" only loadable by boot or platform loaders)
523 static void check_prohibited_package(Symbol* class_name,
524 Handle class_loader,
525 TRAPS);
526 public:
527 // tell if two classes have the same enclosing class (at package level)
528 bool is_same_package_member(const Klass* class2, TRAPS) const;
529
530 // initialization state
531 bool is_loaded() const { return _init_state >= loaded; }
532 bool is_linked() const { return _init_state >= linked; }
533 bool is_initialized() const { return _init_state == fully_initialized; }
534 bool is_not_initialized() const { return _init_state < being_initialized; }
535 bool is_being_initialized() const { return _init_state == being_initialized; }
536 bool is_in_error_state() const { return _init_state == initialization_error; }
537 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
538 ClassState init_state() { return (ClassState)_init_state; }
539 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
540
541 // defineClass specified verification
542 bool should_verify_class() const {
543 return (_misc_flags & _misc_should_verify_class) != 0;
544 }
545 void set_should_verify_class(bool value) {
546 if (value) {
547 _misc_flags |= _misc_should_verify_class;
548 } else {
549 _misc_flags &= ~_misc_should_verify_class;
550 }
551 }
552
553 // marking
554 bool is_marked_dependent() const { return _is_marked_dependent; }
555 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
556
557 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); }
558
559 // initialization (virtuals from Klass)
560 bool should_be_initialized() const; // means that initialize should be called
561 void initialize(TRAPS);
562 void link_class(TRAPS);
563 bool link_class_or_fail(TRAPS); // returns false on failure
564 void unlink_class();
565 void rewrite_class(TRAPS);
566 void link_methods(TRAPS);
567 Method* class_initializer() const;
568
569 // set the class to initialized if no static initializer is present
570 void eager_initialize(Thread *thread);
571
572 // reference type
573 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
574 void set_reference_type(ReferenceType t) {
575 assert(t == (u1)t, "overflow");
576 _reference_type = (u1)t;
577 }
578
579 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
580
581 // find local field, returns true if found
582 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
583 // find field in direct superinterfaces, returns the interface in which the field is defined
584 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
585 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
586 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
587 // find instance or static fields 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, bool is_static, fieldDescriptor* fd) const;
589
590 // find a non-static or static field given its offset within the class.
591 bool contains_field_offset(int offset) {
592 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value());
593 }
594
595 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
596 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
597
598 // find a local method (returns NULL if not found)
599 Method* find_method(const Symbol* name, const Symbol* signature) const;
600 static Method* find_method(const Array<Method*>* methods,
601 const Symbol* name,
602 const Symbol* signature);
603
604 // find a local method, but skip static methods
605 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
606 static Method* find_instance_method(const Array<Method*>* methods,
607 const Symbol* name,
608 const Symbol* signature);
609
610 // find a local method (returns NULL if not found)
611 Method* find_local_method(const Symbol* name,
612 const Symbol* signature,
613 OverpassLookupMode overpass_mode,
614 StaticLookupMode static_mode,
615 PrivateLookupMode private_mode) const;
616
617 // find a local method from given methods array (returns NULL if not found)
618 static Method* find_local_method(const Array<Method*>* methods,
619 const Symbol* name,
620 const Symbol* signature,
621 OverpassLookupMode overpass_mode,
622 StaticLookupMode static_mode,
623 PrivateLookupMode private_mode);
624
625 // find a local method index in methods or default_methods (returns -1 if not found)
626 static int find_method_index(const Array<Method*>* methods,
627 const Symbol* name,
628 const Symbol* signature,
629 OverpassLookupMode overpass_mode,
630 StaticLookupMode static_mode,
631 PrivateLookupMode private_mode);
632
633 // lookup operation (returns NULL if not found)
634 Method* uncached_lookup_method(const Symbol* name,
635 const Symbol* signature,
636 OverpassLookupMode overpass_mode) const;
637
638 // lookup a method in all the interfaces that this class implements
639 // (returns NULL if not found)
640 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
641
642 // lookup a method in local defaults then in all interfaces
643 // (returns NULL if not found)
644 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
645
646 // Find method indices by name. If a method with the specified name is
647 // found the index to the first method is returned, and 'end' is filled in
648 // with the index of first non-name-matching method. If no method is found
649 // -1 is returned.
650 int find_method_by_name(const Symbol* name, int* end) const;
651 static int find_method_by_name(const Array<Method*>* methods,
652 const Symbol* name, int* end);
653
654 // constant pool
655 ConstantPool* constants() const { return _constants; }
656 void set_constants(ConstantPool* c) { _constants = c; }
657
658 // protection domain
659 oop protection_domain() const;
660
661 // signers
662 objArrayOop signers() const;
663
664 // host class
665 InstanceKlass* host_klass() const {
666 InstanceKlass** hk = adr_host_klass();
667 if (hk == NULL) {
668 return NULL;
669 } else {
670 assert(*hk != NULL, "host klass should always be set if the address is not null");
671 return *hk;
672 }
673 }
674 void set_host_klass(const InstanceKlass* host) {
675 assert(is_anonymous(), "not anonymous");
676 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
677 assert(addr != NULL, "no reversed space");
678 if (addr != NULL) {
679 *addr = host;
680 }
681 }
682 bool is_anonymous() const {
683 return (_misc_flags & _misc_is_anonymous) != 0;
684 }
685 void set_is_anonymous(bool value) {
686 if (value) {
687 _misc_flags |= _misc_is_anonymous;
688 } else {
689 _misc_flags &= ~_misc_is_anonymous;
690 }
691 }
692
693 // Oop that keeps the metadata for this class from being unloaded
694 // in places where the metadata is stored in other places, like nmethods
695 oop klass_holder() const {
696 return is_anonymous() ? java_mirror() : class_loader();
697 }
698
699 bool is_contended() const {
700 return (_misc_flags & _misc_is_contended) != 0;
701 }
702 void set_is_contended(bool value) {
703 if (value) {
704 _misc_flags |= _misc_is_contended;
705 } else {
706 _misc_flags &= ~_misc_is_contended;
707 }
708 }
709
710 // source file name
711 Symbol* source_file_name() const {
712 return (_source_file_name_index == 0) ?
713 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
714 }
715 u2 source_file_name_index() const {
716 return _source_file_name_index;
717 }
718 void set_source_file_name_index(u2 sourcefile_index) {
719 _source_file_name_index = sourcefile_index;
720 }
721
722 // minor and major version numbers of class file
723 u2 minor_version() const { return _minor_version; }
724 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
725 u2 major_version() const { return _major_version; }
726 void set_major_version(u2 major_version) { _major_version = major_version; }
727
728 // source debug extension
729 const char* source_debug_extension() const { return _source_debug_extension; }
730 void set_source_debug_extension(const char* array, int length);
731
732 // symbol unloading support (refcount already added)
733 Symbol* array_name() { return _array_name; }
734 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
735
736 // nonstatic oop-map blocks
737 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
738 return oop_map_count * OopMapBlock::size_in_words();
739 }
740 unsigned int nonstatic_oop_map_count() const {
741 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
742 }
743 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
744 void set_nonstatic_oop_map_size(int words) {
745 _nonstatic_oop_map_size = words;
746 }
747
748 #if INCLUDE_JVMTI
749 // Redefinition locking. Class can only be redefined by one thread at a time.
750 bool is_being_redefined() const {
751 return (_extra_flags & _extra_is_being_redefined);
752 }
753 void set_is_being_redefined(bool value) {
754 if (value) {
755 _extra_flags |= _extra_is_being_redefined;
756 } else {
757 _extra_flags &= ~_extra_is_being_redefined;
758 }
759 }
760
761 // RedefineClasses() support for previous versions:
762 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
763 void purge_previous_version_list();
764
765 InstanceKlass* previous_versions() const { return _previous_versions; }
766 #else
767 InstanceKlass* previous_versions() const { return NULL; }
768 #endif
769
770 InstanceKlass* get_klass_version(int version) {
771 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
772 if (ik->constants()->version() == version) {
773 return ik;
774 }
775 }
776 return NULL;
777 }
778
779 bool has_been_redefined() const {
780 return (_misc_flags & _misc_has_been_redefined) != 0;
781 }
782 void set_has_been_redefined() {
783 _misc_flags |= _misc_has_been_redefined;
784 }
785
786 bool has_passed_fingerprint_check() const {
787 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
788 }
789 void set_has_passed_fingerprint_check(bool b) {
790 if (b) {
791 _misc_flags |= _misc_has_passed_fingerprint_check;
792 } else {
793 _misc_flags &= ~_misc_has_passed_fingerprint_check;
794 }
795 }
796 bool supers_have_passed_fingerprint_checks();
797
798 static bool should_store_fingerprint();
799 bool has_stored_fingerprint() const;
800 uint64_t get_stored_fingerprint() const;
801 void store_fingerprint(uint64_t fingerprint);
802
803 bool is_scratch_class() const {
804 return (_misc_flags & _misc_is_scratch_class) != 0;
805 }
806
807 void set_is_scratch_class() {
808 _misc_flags |= _misc_is_scratch_class;
809 }
810
811 bool has_resolved_methods() const {
812 return (_extra_flags & _extra_has_resolved_methods) != 0;
813 }
814
815 void set_has_resolved_methods() {
816 _extra_flags |= _extra_has_resolved_methods;
817 }
818 private:
819
820 void set_kind(unsigned kind) {
821 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
822 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
823 unsigned flags = _misc_flags & ~fmask;
824 _misc_flags = (flags | (kind << _misc_kind_field_pos));
825 }
826
827 bool is_kind(unsigned desired) const {
828 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
829 return kind == desired;
830 }
831
832 public:
833
834 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
835 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
836 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
837 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
838 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
839 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
840
841 #if INCLUDE_JVMTI
842
843 void init_previous_versions() {
844 _previous_versions = NULL;
845 }
846
847 private:
848 static bool _has_previous_versions;
849 public:
850 static void purge_previous_versions(InstanceKlass* ik) {
851 if (ik->has_been_redefined()) {
852 ik->purge_previous_version_list();
853 }
854 }
855
856 static bool has_previous_versions_and_reset();
857
858 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
859 void set_cached_class_file(JvmtiCachedClassFileData *data) {
860 _cached_class_file = data;
861 }
862 JvmtiCachedClassFileData * get_cached_class_file();
863 jint get_cached_class_file_len();
864 unsigned char * get_cached_class_file_bytes();
865
866 // JVMTI: Support for caching of field indices, types, and offsets
867 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
868 _jvmti_cached_class_field_map = descriptor;
869 }
870 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
871 return _jvmti_cached_class_field_map;
872 }
873
874 #if INCLUDE_CDS
875 void set_archived_class_data(JvmtiCachedClassFileData* data) {
876 _cached_class_file = data;
877 }
878
879 JvmtiCachedClassFileData * get_archived_class_data();
880 #endif // INCLUDE_CDS
881 #else // INCLUDE_JVMTI
882
883 static void purge_previous_versions(InstanceKlass* ik) { return; };
884 static bool has_previous_versions_and_reset() { return false; }
885
886 void set_cached_class_file(JvmtiCachedClassFileData *data) {
887 assert(data == NULL, "unexpected call with JVMTI disabled");
888 }
889 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
890
891 #endif // INCLUDE_JVMTI
892
893 bool has_nonstatic_concrete_methods() const {
894 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
895 }
896 void set_has_nonstatic_concrete_methods(bool b) {
897 if (b) {
898 _misc_flags |= _misc_has_nonstatic_concrete_methods;
899 } else {
900 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
901 }
902 }
903
904 bool declares_nonstatic_concrete_methods() const {
905 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
906 }
907 void set_declares_nonstatic_concrete_methods(bool b) {
908 if (b) {
909 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
910 } else {
911 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
912 }
913 }
914
915 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
916 inline u2 next_method_idnum();
917 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
918
919 // generics support
920 Symbol* generic_signature() const {
921 return (_generic_signature_index == 0) ?
922 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
923 }
924 u2 generic_signature_index() const {
925 return _generic_signature_index;
926 }
927 void set_generic_signature_index(u2 sig_index) {
928 _generic_signature_index = sig_index;
929 }
930
931 u2 enclosing_method_data(int offset) const;
932 u2 enclosing_method_class_index() const {
933 return enclosing_method_data(enclosing_method_class_index_offset);
934 }
935 u2 enclosing_method_method_index() {
936 return enclosing_method_data(enclosing_method_method_index_offset);
937 }
938 void set_enclosing_method_indices(u2 class_index,
939 u2 method_index);
940
941 // jmethodID support
942 jmethodID get_jmethod_id(const methodHandle& method_h);
943 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
944 jmethodID new_id, jmethodID* new_jmeths,
945 jmethodID* to_dealloc_id_p,
946 jmethodID** to_dealloc_jmeths_p);
947 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
948 size_t *length_p, jmethodID* id_p);
949 void ensure_space_for_methodids(int start_offset = 0);
950 jmethodID jmethod_id_or_null(Method* method);
951
952 // annotations support
953 Annotations* annotations() const { return _annotations; }
954 void set_annotations(Annotations* anno) { _annotations = anno; }
955
956 AnnotationArray* class_annotations() const {
957 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
958 }
959 Array<AnnotationArray*>* fields_annotations() const {
960 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
961 }
962 AnnotationArray* class_type_annotations() const {
963 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
964 }
965 Array<AnnotationArray*>* fields_type_annotations() const {
966 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
967 }
968 // allocation
969 instanceOop allocate_instance(TRAPS);
970
971 // additional member function to return a handle
972 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
973
974 objArrayOop allocate_objArray(int n, int length, TRAPS);
975 // Helper function
976 static instanceOop register_finalizer(instanceOop i, TRAPS);
977
978 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
979 // if not, throw either an Error or an Exception.
980 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
981
982 // initialization
983 void call_class_initializer(TRAPS);
984 void set_initialization_state_and_notify(ClassState state, TRAPS);
985
986 // OopMapCache support
987 OopMapCache* oop_map_cache() { return _oop_map_cache; }
988 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
989 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
990
991 // JNI identifier support (for static fields - for jni performance)
992 JNIid* jni_ids() { return _jni_ids; }
993 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
994 JNIid* jni_id_for(int offset);
995
996 // maintenance of deoptimization dependencies
997 inline DependencyContext dependencies();
998 int mark_dependent_nmethods(KlassDepChange& changes);
999 void add_dependent_nmethod(nmethod* nm);
1000 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
1001
1002 // On-stack replacement support
1003 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1004 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1005 void add_osr_nmethod(nmethod* n);
1006 bool remove_osr_nmethod(nmethod* n);
1007 int mark_osr_nmethods(const Method* m);
1008 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1009
1010 #if INCLUDE_JVMTI
1011 // Breakpoint support (see methods on Method* for details)
1012 BreakpointInfo* breakpoints() const { return _breakpoints; };
1013 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1014 #endif
1015
1016 // support for stub routines
1017 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1018 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
1019 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1020
1021 // subclass/subinterface checks
1022 bool implements_interface(Klass* k) const;
1023 bool is_same_or_direct_interface(Klass* k) const;
1024
1025 #ifdef ASSERT
1026 // check whether this class or one of its superclasses was redefined
1027 bool has_redefined_this_or_super() const;
1028 #endif
1029
1030 // Access to the implementor of an interface.
1031 Klass* implementor() const
1032 {
1033 Klass** k = adr_implementor();
1034 if (k == NULL) {
1035 return NULL;
1036 } else {
1037 return *k;
1038 }
1039 }
1040
1041 void set_implementor(Klass* k) {
1042 assert(is_interface(), "not interface");
1043 Klass** addr = adr_implementor();
1044 assert(addr != NULL, "null addr");
1045 if (addr != NULL) {
1046 *addr = k;
1047 }
1048 }
1049
1050 int nof_implementors() const {
1051 Klass* k = implementor();
1052 if (k == NULL) {
1053 return 0;
1054 } else if (k != this) {
1055 return 1;
1056 } else {
1057 return 2;
1058 }
1059 }
1060
1061 void add_implementor(Klass* k); // k is a new class that implements this interface
1062 void init_implementor(); // initialize
1063
1064 // link this class into the implementors list of every interface it implements
1065 void process_interfaces(Thread *thread);
1066
1067 // virtual operations from Klass
1068 bool is_leaf_class() const { return _subklass == NULL; }
1069 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1070 bool compute_is_subtype_of(Klass* k);
1071 bool can_be_primary_super_slow() const;
1072 int oop_size(oop obj) const { return size_helper(); }
1073 // slow because it's a virtual call and used for verifying the layout_helper.
1074 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1075 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1076
1077 // Iterators
1078 void do_local_static_fields(FieldClosure* cl);
1079 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1080 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1081
1082 void methods_do(void f(Method* method));
1083 void array_klasses_do(void f(Klass* k));
1084 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1085 bool super_types_do(SuperTypeClosure* blk);
1086
1087 static InstanceKlass* cast(Klass* k) {
1088 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1089 }
1090
1091 static const InstanceKlass* cast(const Klass* k) {
1092 assert(k != NULL, "k should not be null");
1093 assert(k->is_instance_klass(), "cast to InstanceKlass");
1094 return static_cast<const InstanceKlass*>(k);
1095 }
1096
1097 InstanceKlass* java_super() const {
1098 return (super() == NULL) ? NULL : cast(super());
1099 }
1100
1101 // Sizing (in words)
1102 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1103
1104 static int size(int vtable_length, int itable_length,
1105 int nonstatic_oop_map_size,
1106 bool is_interface, bool is_anonymous, bool has_stored_fingerprint,
1107 int java_fields, bool is_value_type) {
1108 return align_metadata_size(header_size() +
1109 (is_value_type ? (int)sizeof(address) : 0) +
1110 (is_value_type ? (int)sizeof(address) : 0) +
1111 vtable_length +
1112 itable_length +
1113 nonstatic_oop_map_size +
1114 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1115 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1116 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1117 (java_fields * (int)sizeof(Klass*)/wordSize) +
1118 (is_value_type ? (int)sizeof(Klass*) : 0) +
1119 (is_value_type ? (int)sizeof(intptr_t)*2 : 0));
1120 }
1121 int size() const { return size(vtable_length(),
1122 itable_length(),
1123 nonstatic_oop_map_size(),
1124 is_interface(),
1125 is_anonymous(),
1126 has_stored_fingerprint(),
1127 has_value_fields() ? java_fields_count() : 0,
1128 is_value());
1129 }
1130 #if INCLUDE_SERVICES
1131 virtual void collect_statistics(KlassSizeStats *sz) const;
1132 #endif
1133
1134 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + (is_value() ? 2 : 0 ) + vtable_length(); }
1135 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1136
1137 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1138
1139 address static_field_addr(int offset);
1140
1141 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1142
1143 OopMapBlock* start_of_nonstatic_oop_maps() const {
1144 return (OopMapBlock*)(start_of_itable() + itable_length());
1145 }
1146
1147 Klass** end_of_nonstatic_oop_maps() const {
1148 return (Klass**)(start_of_nonstatic_oop_maps() +
1149 nonstatic_oop_map_count());
1150 }
1151
1152 Klass** adr_implementor() const {
1153 if (is_interface()) {
1154 return (Klass**)end_of_nonstatic_oop_maps();
1155 } else {
1156 return NULL;
1157 }
1158 };
1159
1160 InstanceKlass** adr_host_klass() const {
1161 if (is_anonymous()) {
1162 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1163 if (adr_impl != NULL) {
1164 return adr_impl + 1;
1165 } else {
1166 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1167 }
1168 } else {
1169 return NULL;
1170 }
1171 }
1172
1173 address adr_fingerprint() const {
1174 if (has_stored_fingerprint()) {
1175 InstanceKlass** adr_host = adr_host_klass();
1176 if (adr_host != NULL) {
1177 return (address)(adr_host + 1);
1178 }
1179
1180 Klass** adr_impl = adr_implementor();
1181 if (adr_impl != NULL) {
1182 return (address)(adr_impl + 1);
1183 }
1184
1185 return (address)end_of_nonstatic_oop_maps();
1186 } else {
1187 return NULL;
1188 }
1189 }
1190
1191 address adr_value_fields_klasses() const {
1192 if (has_value_fields()) {
1193 address adr_fing = adr_fingerprint();
1194 if (adr_fing != NULL) {
1195 return adr_fingerprint() + sizeof(u8);
1196 }
1197
1198 InstanceKlass** adr_host = adr_host_klass();
1199 if (adr_host != NULL) {
1200 return (address)(adr_host + 1);
1201 }
1202
1203 Klass** adr_impl = adr_implementor();
1204 if (adr_impl != NULL) {
1205 return (address)(adr_impl + 1);
1206 }
1207
1208 return (address)end_of_nonstatic_oop_maps();
1209 } else {
1210 return NULL;
1211 }
1212 }
1213
1214 address adr_vcc_klass() const {
1215 if (has_vcc_klass()) {
1216 address adr_jf = adr_value_fields_klasses();
1217 if (adr_jf != NULL) {
1218 return adr_jf + this->java_fields_count() * sizeof(Klass*);
1219 }
1220
1221 address adr_fing = adr_fingerprint();
1222 if (adr_fing != NULL) {
1223 return adr_fingerprint() + sizeof(u8);
1224 }
1225
1226 InstanceKlass** adr_host = adr_host_klass();
1227 if (adr_host != NULL) {
1228 return (address)(adr_host + 1);
1229 }
1230
1231 Klass** adr_impl = adr_implementor();
1232 if (adr_impl != NULL) {
1233 return (address)(adr_impl + 1);
1234 }
1235
1236 return (address)end_of_nonstatic_oop_maps();
1237 } else {
1238 return NULL;
1239 }
1240 }
1241
1242 Klass* get_value_field_klass(int idx) {
1243 assert(has_value_fields(), "Sanity checking");
1244 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1245 assert(k != NULL, "Should always be set before being read");
1246 assert(k->is_value(), "Must be a value type");
1247 return k;
1248 }
1249
1250 void set_value_field_klass(int idx, Klass* k) {
1251 assert(has_value_fields(), "Sanity checking");
1252 assert(k != NULL, "Should not be set to NULL");
1253 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1254 ((Klass**)adr_value_fields_klasses())[idx] = k;
1255 }
1256
1257 Klass* get_vcc_klass() const {
1258 if (has_vcc_klass()) {
1259 Klass* k = *(Klass**)adr_vcc_klass();
1260 assert(k == NULL || !k->is_value(), "Must not be a value type");
1261 return k;
1262 }
1263 return NULL;
1264 }
1265
1266 void set_vcc_klass(Klass* k) {
1267 assert(has_vcc_klass(), "Sanity checking");
1268 assert(k == NULL || !k->is_value(), "Must not be a value type");
1269 *(Klass**)adr_vcc_klass()= k;
1270 }
1271
1272 // Use this to return the size of an instance in heap words:
1273 virtual int size_helper() const {
1274 return layout_helper_to_size_helper(layout_helper());
1275 }
1276
1277 // This bit is initialized in classFileParser.cpp.
1278 // It is false under any of the following conditions:
1279 // - the class is abstract (including any interface)
1280 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1281 // - the class size is larger than FastAllocateSizeLimit
1282 // - the class is java/lang/Class, which cannot be allocated directly
1283 bool can_be_fastpath_allocated() const {
1284 return !layout_helper_needs_slow_path(layout_helper());
1285 }
1286
1287 // Java itable
1288 klassItable itable() const; // return klassItable wrapper
1289 Method* method_at_itable(Klass* holder, int index, TRAPS);
1290
1291 #if INCLUDE_JVMTI
1292 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1293 #endif // INCLUDE_JVMTI
1294
1295 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1296 void clean_implementors_list(BoolObjectClosure* is_alive);
1297 void clean_method_data(BoolObjectClosure* is_alive);
1298
1299 // Explicit metaspace deallocation of fields
1300 // For RedefineClasses and class file parsing errors, we need to deallocate
1301 // instanceKlasses and the metadata they point to.
1302 void deallocate_contents(ClassLoaderData* loader_data);
1303 static void deallocate_methods(ClassLoaderData* loader_data,
1304 Array<Method*>* methods);
1305 void static deallocate_interfaces(ClassLoaderData* loader_data,
1306 const Klass* super_klass,
1307 Array<Klass*>* local_interfaces,
1308 Array<Klass*>* transitive_interfaces);
1309
1310 // The constant pool is on stack if any of the methods are executing or
1311 // referenced by handles.
1312 bool on_stack() const { return _constants->on_stack(); }
1313
1314 // callbacks for actions during class unloading
1315 static void notify_unload_class(InstanceKlass* ik);
1316 static void release_C_heap_structures(InstanceKlass* ik);
1317
1318 // Naming
1319 const char* signature_name() const;
1320 static Symbol* package_from_name(const Symbol* name, TRAPS);
1321
1322 // GC specific object visitors
1323 //
1324 #if INCLUDE_ALL_GCS
1325 // Parallel Scavenge
1326 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1327 // Parallel Compact
1328 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1329 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1330 #endif
1331
1332 // Oop fields (and metadata) iterators
1333 // [nv = true] Use non-virtual calls to do_oop_nv.
1334 // [nv = false] Use virtual calls to do_oop.
1335 //
1336 // The InstanceKlass iterators also visits the Object's klass.
1337
1338 // Forward iteration
1339 public:
1340 // Iterate over all oop fields in the oop maps.
1341 template <bool nv, class OopClosureType>
1342 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1343
1344 protected:
1345 // Iterate over all oop fields and metadata.
1346 template <bool nv, class OopClosureType>
1347 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1348
1349 private:
1350 // Iterate over all oop fields in the oop maps.
1351 // Specialized for [T = oop] or [T = narrowOop].
1352 template <bool nv, typename T, class OopClosureType>
1353 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1354
1355 // Iterate over all oop fields in one oop map.
1356 template <bool nv, typename T, class OopClosureType>
1357 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1358
1359
1360 // Reverse iteration
1361 #if INCLUDE_ALL_GCS
1362 public:
1363 // Iterate over all oop fields in the oop maps.
1364 template <bool nv, class OopClosureType>
1365 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1366
1367 protected:
1368 // Iterate over all oop fields and metadata.
1369 template <bool nv, class OopClosureType>
1370 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1371
1372 private:
1373 // Iterate over all oop fields in the oop maps.
1374 // Specialized for [T = oop] or [T = narrowOop].
1375 template <bool nv, typename T, class OopClosureType>
1376 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1377
1378 // Iterate over all oop fields in one oop map.
1379 template <bool nv, typename T, class OopClosureType>
1380 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1381 #endif
1382
1383
1384 // Bounded range iteration
1385 public:
1386 // Iterate over all oop fields in the oop maps.
1387 template <bool nv, class OopClosureType>
1388 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1389
1390 protected:
1391 // Iterate over all oop fields and metadata.
1392 template <bool nv, class OopClosureType>
1393 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1394
1395 private:
1396 // Iterate over all oop fields in the oop maps.
1397 // Specialized for [T = oop] or [T = narrowOop].
1398 template <bool nv, typename T, class OopClosureType>
1399 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1400
1401 // Iterate over all oop fields in one oop map.
1402 template <bool nv, typename T, class OopClosureType>
1403 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1404
1405
1406 public:
1407
1408 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1409 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1410
1411 #if INCLUDE_ALL_GCS
1412 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1413 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1414 #endif // INCLUDE_ALL_GCS
1415
1416 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1417
1418 public:
1419 void set_in_error_state() {
1420 assert(DumpSharedSpaces, "only call this when dumping archive");
1421 _init_state = initialization_error;
1422 }
1423 bool check_sharing_error_state();
1424
1425 private:
1426 // initialization state
1427 #ifdef ASSERT
1428 void set_init_state(ClassState state);
1429 #else
1430 void set_init_state(ClassState state) { _init_state = (u1)state; }
1431 #endif
1432 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1433 void set_init_thread(Thread *thread) { _init_thread = thread; }
1434
1435 // The RedefineClasses() API can cause new method idnums to be needed
1436 // which will cause the caches to grow. Safety requires different
1437 // cache management logic if the caches can grow instead of just
1438 // going from NULL to non-NULL.
1439 bool idnum_can_increment() const { return has_been_redefined(); }
1440 inline jmethodID* methods_jmethod_ids_acquire() const;
1441 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1442
1443 // Lock during initialization
1444 public:
1445 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1446 // Must be one per class and it has to be a VM internal object so java code
1447 // cannot lock it (like the mirror).
1448 // It has to be an object not a Mutex because it's held through java calls.
1449 oop init_lock() const;
1450 private:
1451 void fence_and_clear_init_lock();
1452
1453 bool link_class_impl (bool throw_verifyerror, TRAPS);
1454 bool verify_code (bool throw_verifyerror, TRAPS);
1455 void initialize_impl (TRAPS);
1456 void initialize_super_interfaces (TRAPS);
1457 void eager_initialize_impl ();
1458 /* jni_id_for_impl for jfieldID only */
1459 JNIid* jni_id_for_impl (int offset);
1460 protected:
1461 // Returns the array class for the n'th dimension
1462 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
1463
1464 // Returns the array class with this class as element type
1465 virtual Klass* array_klass_impl(bool or_null, TRAPS);
1466
1467 private:
1468
1469 // find a local method (returns NULL if not found)
1470 Method* find_method_impl(const Symbol* name,
1471 const Symbol* signature,
1472 OverpassLookupMode overpass_mode,
1473 StaticLookupMode static_mode,
1474 PrivateLookupMode private_mode) const;
1475
1476 static Method* find_method_impl(const Array<Method*>* methods,
1477 const Symbol* name,
1478 const Symbol* signature,
1479 OverpassLookupMode overpass_mode,
1480 StaticLookupMode static_mode,
1481 PrivateLookupMode private_mode);
1482
1483 // Free CHeap allocated fields.
1484 void release_C_heap_structures();
1485
1486 #if INCLUDE_JVMTI
1487 // RedefineClasses support
1488 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1489 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1490 #endif
1491 public:
1492 // CDS support - remove and restore oops from metadata. Oops are not shared.
1493 virtual void remove_unshareable_info();
1494 virtual void remove_java_mirror();
1495 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1496
1497 // jvm support
1498 jint compute_modifier_flags(TRAPS) const;
1499
1500 //Valhalla prototype ValueCapableClass
1501 void create_value_capable_class(Handle class_loader, Handle protection_domain, TRAPS);
1502
1503 public:
1504 // JVMTI support
1505 jint jvmti_class_status() const;
1506
1507 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1508
1509 public:
1510 // Printing
1511 #ifndef PRODUCT
1512 void print_on(outputStream* st) const;
1513 #endif
1514 void print_value_on(outputStream* st) const;
1515
1516 void oop_print_value_on(oop obj, outputStream* st);
1517
1518 #ifndef PRODUCT
1519 void oop_print_on (oop obj, outputStream* st);
1520
1521 void print_dependent_nmethods(bool verbose = false);
1522 bool is_dependent_nmethod(nmethod* nm);
1523 #endif
1524
1525 const char* internal_name() const;
1526
1527 // Verification
1528 void verify_on(outputStream* st);
1529
1530 void oop_verify_on(oop obj, outputStream* st);
1531
1532 // Logging
1533 void print_class_load_logging(ClassLoaderData* loader_data,
1534 const char* module_name,
1535 const ClassFileStream* cfs) const;
1536 };
1537
1538 // for adding methods
1539 // UNSET_IDNUM return means no more ids available
1540 inline u2 InstanceKlass::next_method_idnum() {
1541 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1542 return ConstMethod::UNSET_IDNUM; // no more ids available
1543 } else {
1544 return _idnum_allocated_count++;
1545 }
1546 }
1547
1548
1549 /* JNIid class for jfieldIDs only */
1550 class JNIid: public CHeapObj<mtClass> {
1551 friend class VMStructs;
1552 private:
1553 Klass* _holder;
1554 JNIid* _next;
1555 int _offset;
1556 #ifdef ASSERT
1557 bool _is_static_field_id;
1558 #endif
1559
1560 public:
1561 // Accessors
1562 Klass* holder() const { return _holder; }
1563 int offset() const { return _offset; }
1564 JNIid* next() { return _next; }
1565 // Constructor
1566 JNIid(Klass* holder, int offset, JNIid* next);
1567 // Identifier lookup
1568 JNIid* find(int offset);
1569
1570 bool find_local_field(fieldDescriptor* fd) {
1571 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1572 }
1573
1574 static void deallocate(JNIid* id);
1575 // Debugging
1576 #ifdef ASSERT
1577 bool is_static_field_id() const { return _is_static_field_id; }
1578 void set_is_static_field_id() { _is_static_field_id = true; }
1579 #endif
1580 void verify(Klass* holder);
1581 };
1582
1583 // An iterator that's used to access the inner classes indices in the
1584 // InstanceKlass::_inner_classes array.
1585 class InnerClassesIterator : public StackObj {
1586 private:
1587 Array<jushort>* _inner_classes;
1588 int _length;
1589 int _idx;
1590 public:
1591
1592 InnerClassesIterator(const InstanceKlass* k) {
1593 _inner_classes = k->inner_classes();
1594 if (k->inner_classes() != NULL) {
1595 _length = _inner_classes->length();
1596 // The inner class array's length should be the multiple of
1597 // inner_class_next_offset if it only contains the InnerClasses
1598 // attribute data, or it should be
1599 // n*inner_class_next_offset+enclosing_method_attribute_size
1600 // if it also contains the EnclosingMethod data.
1601 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1602 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1603 "just checking");
1604 // Remove the enclosing_method portion if exists.
1605 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1606 _length -= InstanceKlass::enclosing_method_attribute_size;
1607 }
1608 } else {
1609 _length = 0;
1610 }
1611 _idx = 0;
1612 }
1613
1614 int length() const {
1615 return _length;
1616 }
1617
1618 void next() {
1619 _idx += InstanceKlass::inner_class_next_offset;
1620 }
1621
1622 bool done() const {
1623 return (_idx >= _length);
1624 }
1625
1626 u2 inner_class_info_index() const {
1627 return _inner_classes->at(
1628 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1629 }
1630
1631 void set_inner_class_info_index(u2 index) {
1632 _inner_classes->at_put(
1633 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1634 }
1635
1636 u2 outer_class_info_index() const {
1637 return _inner_classes->at(
1638 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1639 }
1640
1641 void set_outer_class_info_index(u2 index) {
1642 _inner_classes->at_put(
1643 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1644 }
1645
1646 u2 inner_name_index() const {
1647 return _inner_classes->at(
1648 _idx + InstanceKlass::inner_class_inner_name_offset);
1649 }
1650
1651 void set_inner_name_index(u2 index) {
1652 _inner_classes->at_put(
1653 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1654 }
1655
1656 u2 inner_access_flags() const {
1657 return _inner_classes->at(
1658 _idx + InstanceKlass::inner_class_access_flags_offset);
1659 }
1660 };
1661
1662 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP