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 "code/vmreg.hpp"
33 #include "gc/shared/specialized_oop_closures.hpp"
34 #include "memory/referenceType.hpp"
35 #include "oops/annotations.hpp"
36 #include "oops/constMethod.hpp"
37 #include "oops/fieldInfo.hpp"
38 #include "oops/instanceOop.hpp"
39 #include "oops/klassVtable.hpp"
40 #include "runtime/handles.hpp"
41 #include "runtime/os.hpp"
42 #include "trace/traceMacros.hpp"
43 #include "utilities/accessFlags.hpp"
44 #include "utilities/align.hpp"
45 #include "utilities/macros.hpp"
46
47 // An InstanceKlass is the VM level representation of a Java class.
48 // It contains all information needed for at class at execution runtime.
49
50 // InstanceKlass embedded field layout (after declared fields):
51 // [EMBEDDED Java vtable ] size in words = vtable_len
52 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
53 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
54 // indicating where oops are located in instances of this klass.
55 // [EMBEDDED implementor of the interface] only exist for interface
56 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
57 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
58 // [EMBEDDED ValueKlassFixedBlock] only if is a ValueKlass instance
59
60
61 // forward declaration for class -- see below for definition
62 #if INCLUDE_JVMTI
63 class BreakpointInfo;
64 #endif
65 class ClassFileParser;
66 class KlassDepChange;
67 class DependencyContext;
68 class fieldDescriptor;
69 class jniIdMapBase;
70 class JNIid;
71 class JvmtiCachedClassFieldMap;
72 class SuperTypeClosure;
73 class BufferedValueTypeBlob;
74
75 // This is used in iterators below.
76 class FieldClosure: public StackObj {
77 public:
78 virtual void do_field(fieldDescriptor* fd) = 0;
79 };
80
81 #ifndef PRODUCT
82 // Print fields.
83 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
84 class FieldPrinter: public FieldClosure {
85 oop _obj;
86 outputStream* _st;
87 public:
88 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
89 void do_field(fieldDescriptor* fd);
90 };
91 #endif // !PRODUCT
92
93 // ValueObjs embedded in klass. Describes where oops are located in instances of
94 // this klass.
95 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
96 public:
97 // Byte offset of the first oop mapped by this block.
98 int offset() const { return _offset; }
99 void set_offset(int offset) { _offset = offset; }
100
101 // Number of oops in this block.
102 uint count() const { return _count; }
103 void set_count(uint count) { _count = count; }
104
105 void increment_count(int diff) { _count += diff; }
106
107 int offset_span() const { return _count * heapOopSize; }
108
109 int end_offset() const {
110 return offset() + offset_span();
111 }
112
113 bool is_contiguous(int another_offset) const {
114 return another_offset == end_offset();
115 }
116
117 // sizeof(OopMapBlock) in words.
118 static const int size_in_words() {
119 return align_up((int)sizeof(OopMapBlock), wordSize) >>
120 LogBytesPerWord;
121 }
122
123 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
124 return a->offset() - b->offset();
125 }
126
127 private:
128 int _offset;
129 uint _count;
130 };
131
132 struct JvmtiCachedClassFileData;
133
134 class SigEntry;
135
136 class ValueKlassFixedBlock VALUE_OBJ_CLASS_SPEC {
137 Array<SigEntry>** _extended_sig;
138 Array<VMRegPair>** _return_regs;
139 address* _pack_handler;
140 address* _unpack_handler;
141 int* _default_value_offset;
142
143 friend class ValueKlass;
144 };
145
146 class InstanceKlass: public Klass {
147 friend class VMStructs;
148 friend class JVMCIVMStructs;
149 friend class ClassFileParser;
150 friend class CompileReplay;
151
152 protected:
153 InstanceKlass(const ClassFileParser& parser, unsigned kind);
154
155 public:
156 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
157
158 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
159 // of the class loading & initialization procedure, and the use of the states.
160 enum ClassState {
161 allocated, // allocated (but not yet linked)
162 loaded, // loaded and inserted in class hierarchy (but not linked yet)
163 linked, // successfully linked/verified (but not initialized yet)
164 being_initialized, // currently running class initializer
165 fully_initialized, // initialized (successfull final state)
166 initialization_error // error happened during initialization
167 };
168
169 static int number_of_instance_classes() { return _total_instanceKlass_count; }
170
171 private:
172 static volatile int _total_instanceKlass_count;
173 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
174
175 protected:
176 // If you add a new field that points to any metaspace object, you
177 // must add this field to InstanceKlass::metaspace_pointers_do().
178
179 // Annotations for this class
180 Annotations* _annotations;
181 // Package this class is defined in
182 PackageEntry* _package_entry;
183 // Array classes holding elements of this class.
184 Klass* volatile _array_klasses;
185 // Constant pool for this class.
186 ConstantPool* _constants;
187 // The InnerClasses attribute and EnclosingMethod attribute. The
188 // _inner_classes is an array of shorts. If the class has InnerClasses
189 // attribute, then the _inner_classes array begins with 4-tuples of shorts
190 // [inner_class_info_index, outer_class_info_index,
191 // inner_name_index, inner_class_access_flags] for the InnerClasses
192 // attribute. If the EnclosingMethod attribute exists, it occupies the
193 // last two shorts [class_index, method_index] of the array. If only
194 // the InnerClasses attribute exists, the _inner_classes array length is
195 // number_of_inner_classes * 4. If the class has both InnerClasses
196 // and EnclosingMethod attributes the _inner_classes array length is
197 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
198 Array<jushort>* _inner_classes;
199
200 // the source debug extension for this klass, NULL if not specified.
201 // Specified as UTF-8 string without terminating zero byte in the classfile,
202 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
203 const char* _source_debug_extension;
204 // Array name derived from this class which needs unreferencing
205 // if this class is unloaded.
206 Symbol* _array_name;
207
208 // Number of heapOopSize words used by non-static fields in this klass
209 // (including inherited fields but after header_size()).
210 int _nonstatic_field_size;
211 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
212 // Constant pool index to the utf8 entry of the Generic signature,
213 // or 0 if none.
214 u2 _generic_signature_index;
215 // Constant pool index to the utf8 entry for the name of source file
216 // containing this klass, 0 if not specified.
217 u2 _source_file_name_index;
218 u2 _static_oop_field_count;// number of static oop fields in this klass
219 u2 _java_fields_count; // The number of declared Java fields
220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
221
222 int _itable_len; // length of Java itable (in words)
223 // _is_marked_dependent can be set concurrently, thus cannot be part of the
224 // _misc_flags.
225 bool _is_marked_dependent; // used for marking during flushing and deoptimization
226
227 public:
228 enum {
229 _extra_is_being_redefined = 1 << 0, // used for locking redefinition
230 _extra_has_resolved_methods = 1 << 1, // resolved methods table entries added for this class
231 _extra_has_value_fields = 1 << 2, // has value fields and related embedded section is not empty
232 _extra_is_bufferable = 1 << 3 // value can be buffered out side of the Java heap
233 };
234
235 protected:
236 u1 _extra_flags;
237
238 // The low three bits of _misc_flags contains the kind field.
239 // This can be used to quickly discriminate among the five kinds of
240 // InstanceKlass.
241
242 static const unsigned _misc_kind_field_size = 3;
243 static const unsigned _misc_kind_field_pos = 0;
244 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
245
246 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
247 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
248 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
249 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
250 static const unsigned _misc_kind_value_type = 4; // ValueKlass
251
252 // Start after _misc_kind field.
253 enum {
254 _misc_rewritten = 1 << 3, // methods rewritten.
255 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops
256 _misc_should_verify_class = 1 << 5, // allow caching of preverification
257 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field
258 _misc_is_contended = 1 << 7, // marked with contended annotation
259 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods
260 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods
261 _misc_has_been_redefined = 1 << 10, // class has been redefined
262 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its
263 // code source was found to be matching the value recorded by AOT.
264 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class
265 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader
266 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader
267 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader
268 // u2 _misc_flags full (see _extra_flags)
269 };
270 u2 loader_type_bits() {
271 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
272 }
273 u2 _misc_flags;
274 u2 _minor_version; // minor version number of class file
275 u2 _major_version; // major version number of class file
276 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
277 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
278 JNIid* _jni_ids; // First JNI identifier for static fields in this class
279 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
280 intptr_t _dep_context; // packed DependencyContext structure
281 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
282 #if INCLUDE_JVMTI
283 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
284 // Linked instanceKlasses of previous versions
285 InstanceKlass* _previous_versions;
286 // JVMTI fields can be moved to their own structure - see 6315920
287 // JVMTI: cached class file, before retransformable agent modified it in CFLH
288 JvmtiCachedClassFileData* _cached_class_file;
289 #endif
290
291 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
292
293 // Class states are defined as ClassState (see above).
294 // Place the _init_state here to utilize the unused 2-byte after
295 // _idnum_allocated_count.
296 u1 _init_state; // state of class
297 u1 _reference_type; // reference type
298
299 #if INCLUDE_JVMTI
300 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
301 #endif
302
303 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
304
305 // Method array.
306 Array<Method*>* _methods;
307 // Default Method Array, concrete methods inherited from interfaces
308 Array<Method*>* _default_methods;
309 // Interface (Klass*s) this class declares locally to implement.
310 Array<Klass*>* _local_interfaces;
311 // Interface (Klass*s) this class implements transitively.
312 Array<Klass*>* _transitive_interfaces;
313 // Int array containing the original order of method in the class file (for JVMTI).
314 Array<int>* _method_ordering;
315 // Int array containing the vtable_indices for default_methods
316 // offset matches _default_methods offset
317 Array<int>* _default_vtable_indices;
318
319 // Instance and static variable information, starts with 6-tuples of shorts
320 // [access, name index, sig index, initval index, low_offset, high_offset]
321 // for all fields, followed by the generic signature data at the end of
322 // the array. Only fields with generic signature attributes have the generic
323 // signature data set in the array. The fields array looks like following:
324 //
325 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
326 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
327 // ...
328 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
329 // [generic signature index]
330 // [generic signature index]
331 // ...
332 Array<u2>* _fields;
333
334 // embedded Java vtable follows here
335 // embedded Java itables follows here
336 // embedded static fields follows here
337 // embedded nonstatic oop-map blocks follows here
338 // embedded implementor of this interface follows here
339 // The embedded implementor only exists if the current klass is an
340 // iterface. The possible values of the implementor fall into following
341 // three cases:
342 // NULL: no implementor.
343 // A Klass* that's not itself: one implementor.
344 // Itself: more than one implementors.
345 // embedded host klass follows here
346 // The embedded host klass only exists in an anonymous class for
347 // dynamic language support (JSR 292 enabled). The host class grants
348 // its access privileges to this class also. The host class is either
349 // named, or a previously loaded anonymous class. A non-anonymous class
350 // or an anonymous class loaded through normal classloading does not
351 // have this embedded field.
352 //
353
354 ValueKlassFixedBlock* _adr_valueklass_fixed_block;
355
356 friend class SystemDictionary;
357
358 public:
359 u2 loader_type() {
360 return _misc_flags & loader_type_bits();
361 }
362
363 bool is_shared_boot_class() const {
364 return (_misc_flags & _misc_is_shared_boot_class) != 0;
365 }
366 bool is_shared_platform_class() const {
367 return (_misc_flags & _misc_is_shared_platform_class) != 0;
368 }
369 bool is_shared_app_class() const {
370 return (_misc_flags & _misc_is_shared_app_class) != 0;
371 }
372
373 void set_class_loader_type(s2 loader_type) {
374 switch (loader_type) {
375 case ClassLoader::BOOT_LOADER:
376 _misc_flags |= _misc_is_shared_boot_class;
377 break;
378 case ClassLoader::PLATFORM_LOADER:
379 _misc_flags |= _misc_is_shared_platform_class;
380 break;
381 case ClassLoader::APP_LOADER:
382 _misc_flags |= _misc_is_shared_app_class;
383 break;
384 default:
385 ShouldNotReachHere();
386 break;
387 }
388 }
389
390 bool has_nonstatic_fields() const {
391 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
392 }
393 void set_has_nonstatic_fields(bool b) {
394 if (b) {
395 _misc_flags |= _misc_has_nonstatic_fields;
396 } else {
397 _misc_flags &= ~_misc_has_nonstatic_fields;
398 }
399 }
400
401 bool has_value_fields() const {
402 return (_extra_flags & _extra_has_value_fields) != 0;
403 }
404 void set_has_value_fields() {
405 _extra_flags |= _extra_has_value_fields;
406 }
407
408 // field sizes
409 int nonstatic_field_size() const { return _nonstatic_field_size; }
410 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
411
412 int static_field_size() const { return _static_field_size; }
413 void set_static_field_size(int size) { _static_field_size = size; }
414
415 int static_oop_field_count() const { return (int)_static_oop_field_count; }
416 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
417
418 // Java itable
419 int itable_length() const { return _itable_len; }
420 void set_itable_length(int len) { _itable_len = len; }
421
422 // array klasses
423 Klass* array_klasses() const { return _array_klasses; }
424 inline Klass* array_klasses_acquire() const; // load with acquire semantics
425 void set_array_klasses(Klass* k) { _array_klasses = k; }
426 inline void release_set_array_klasses(Klass* k); // store with release semantics
427
428 // methods
429 Array<Method*>* methods() const { return _methods; }
430 void set_methods(Array<Method*>* a) { _methods = a; }
431 Method* method_with_idnum(int idnum);
432 Method* method_with_orig_idnum(int idnum);
433 Method* method_with_orig_idnum(int idnum, int version);
434
435 // method ordering
436 Array<int>* method_ordering() const { return _method_ordering; }
437 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
438 void copy_method_ordering(const intArray* m, TRAPS);
439
440 // default_methods
441 Array<Method*>* default_methods() const { return _default_methods; }
442 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
443
444 // default method vtable_indices
445 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
446 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
447 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
448
449 // interfaces
450 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
451 void set_local_interfaces(Array<Klass*>* a) {
452 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
453 _local_interfaces = a; }
454
455 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
456 void set_transitive_interfaces(Array<Klass*>* a) {
457 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
458 _transitive_interfaces = a;
459 }
460
461 private:
462 friend class fieldDescriptor;
463 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
464
465 public:
466 int field_offset (int index) const { return field(index)->offset(); }
467 bool field_flattened (int index) const { return field(index)->is_flatten(); }
468 int field_access_flags(int index) const { return field(index)->access_flags(); }
469 Symbol* field_name (int index) const { return field(index)->name(constants()); }
470 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
471 bool is_field_flatten (int index) const { return field(index)->is_flatten(); }
472
473 // Number of Java declared fields
474 int java_fields_count() const { return (int)_java_fields_count; }
475
476 Array<u2>* fields() const { return _fields; }
477 void set_fields(Array<u2>* f, u2 java_fields_count) {
478 guarantee(_fields == NULL || f == NULL, "Just checking");
479 _fields = f;
480 _java_fields_count = java_fields_count;
481 }
482
483 // inner classes
484 Array<u2>* inner_classes() const { return _inner_classes; }
485 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
486
487 enum InnerClassAttributeOffset {
488 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
489 inner_class_inner_class_info_offset = 0,
490 inner_class_outer_class_info_offset = 1,
491 inner_class_inner_name_offset = 2,
492 inner_class_access_flags_offset = 3,
493 inner_class_next_offset = 4
494 };
495
496 enum EnclosingMethodAttributeOffset {
497 enclosing_method_class_index_offset = 0,
498 enclosing_method_method_index_offset = 1,
499 enclosing_method_attribute_size = 2
500 };
501
502 // method override check
503 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
504
505 // package
506 PackageEntry* package() const { return _package_entry; }
507 ModuleEntry* module() const;
508 bool in_unnamed_package() const { return (_package_entry == NULL); }
509 void set_package(PackageEntry* p) { _package_entry = p; }
510 void set_package(ClassLoaderData* loader_data, TRAPS);
511 bool is_same_class_package(const Klass* class2) const;
512 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
513
514 // find an enclosing class
515 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
516
517 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
518 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
519
520 private:
521 // Check prohibited package ("java/" only loadable by boot or platform loaders)
522 static void check_prohibited_package(Symbol* class_name,
523 Handle class_loader,
524 TRAPS);
525 public:
526 // tell if two classes have the same enclosing class (at package level)
527 bool is_same_package_member(const Klass* class2, TRAPS) const;
528
529 // initialization state
530 bool is_loaded() const { return _init_state >= loaded; }
531 bool is_linked() const { return _init_state >= linked; }
532 bool is_initialized() const { return _init_state == fully_initialized; }
533 bool is_not_initialized() const { return _init_state < being_initialized; }
534 bool is_being_initialized() const { return _init_state == being_initialized; }
535 bool is_in_error_state() const { return _init_state == initialization_error; }
536 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
537 ClassState init_state() { return (ClassState)_init_state; }
538 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
539
540 // defineClass specified verification
541 bool should_verify_class() const {
542 return (_misc_flags & _misc_should_verify_class) != 0;
543 }
544 void set_should_verify_class(bool value) {
545 if (value) {
546 _misc_flags |= _misc_should_verify_class;
547 } else {
548 _misc_flags &= ~_misc_should_verify_class;
549 }
550 }
551
552 // marking
553 bool is_marked_dependent() const { return _is_marked_dependent; }
554 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
555
556 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); }
557
558 // initialization (virtuals from Klass)
559 bool should_be_initialized() const; // means that initialize should be called
560 void initialize(TRAPS);
561 void link_class(TRAPS);
562 bool link_class_or_fail(TRAPS); // returns false on failure
563 void unlink_class();
564 void rewrite_class(TRAPS);
565 void link_methods(TRAPS);
566 Method* class_initializer() const;
567
568 // set the class to initialized if no static initializer is present
569 void eager_initialize(Thread *thread);
570
571 // reference type
572 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
573 void set_reference_type(ReferenceType t) {
574 assert(t == (u1)t, "overflow");
575 _reference_type = (u1)t;
576 }
577
578 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
579
580 // find local field, returns true if found
581 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
582 // find field in direct superinterfaces, returns the interface in which the field is defined
583 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
584 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
585 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
586 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
587 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
588
589 // find a non-static or static field given its offset within the class.
590 bool contains_field_offset(int offset) {
591 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value());
592 }
593
594 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
595 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
596
597 // find a local method (returns NULL if not found)
598 Method* find_method(const Symbol* name, const Symbol* signature) const;
599 static Method* find_method(const Array<Method*>* methods,
600 const Symbol* name,
601 const Symbol* signature);
602
603 // find a local method, but skip static methods
604 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
605 static Method* find_instance_method(const Array<Method*>* methods,
606 const Symbol* name,
607 const Symbol* signature);
608
609 // find a local method (returns NULL if not found)
610 Method* find_local_method(const Symbol* name,
611 const Symbol* signature,
612 OverpassLookupMode overpass_mode,
613 StaticLookupMode static_mode,
614 PrivateLookupMode private_mode) const;
615
616 // find a local method from given methods array (returns NULL if not found)
617 static Method* find_local_method(const Array<Method*>* methods,
618 const Symbol* name,
619 const Symbol* signature,
620 OverpassLookupMode overpass_mode,
621 StaticLookupMode static_mode,
622 PrivateLookupMode private_mode);
623
624 // find a local method index in methods or default_methods (returns -1 if not found)
625 static int find_method_index(const Array<Method*>* methods,
626 const Symbol* name,
627 const Symbol* signature,
628 OverpassLookupMode overpass_mode,
629 StaticLookupMode static_mode,
630 PrivateLookupMode private_mode);
631
632 // lookup operation (returns NULL if not found)
633 Method* uncached_lookup_method(const Symbol* name,
634 const Symbol* signature,
635 OverpassLookupMode overpass_mode) const;
636
637 // lookup a method in all the interfaces that this class implements
638 // (returns NULL if not found)
639 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
640
641 // lookup a method in local defaults then in all interfaces
642 // (returns NULL if not found)
643 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
644
645 // Find method indices by name. If a method with the specified name is
646 // found the index to the first method is returned, and 'end' is filled in
647 // with the index of first non-name-matching method. If no method is found
648 // -1 is returned.
649 int find_method_by_name(const Symbol* name, int* end) const;
650 static int find_method_by_name(const Array<Method*>* methods,
651 const Symbol* name, int* end);
652
653 // constant pool
654 ConstantPool* constants() const { return _constants; }
655 void set_constants(ConstantPool* c) { _constants = c; }
656
657 // protection domain
658 oop protection_domain() const;
659
660 // signers
661 objArrayOop signers() const;
662
663 // host class
664 InstanceKlass* host_klass() const {
665 InstanceKlass** hk = adr_host_klass();
666 if (hk == NULL) {
667 assert(!is_anonymous(), "Anonymous classes have host klasses");
668 return NULL;
669 } else {
670 assert(*hk != NULL, "host klass should always be set if the address is not null");
671 assert(is_anonymous(), "Only anonymous classes have host klasses");
672 return *hk;
673 }
674 }
675 void set_host_klass(const InstanceKlass* host) {
676 assert(is_anonymous(), "not anonymous");
677 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
678 assert(addr != NULL, "no reversed space");
679 if (addr != NULL) {
680 *addr = host;
681 }
682 }
683 bool has_host_klass() const {
684 return adr_host_klass() != NULL;
685 }
686 bool is_anonymous() const {
687 return (_misc_flags & _misc_is_anonymous) != 0;
688 }
689 void set_is_anonymous(bool value) {
690 if (value) {
691 _misc_flags |= _misc_is_anonymous;
692 } else {
693 _misc_flags &= ~_misc_is_anonymous;
694 }
695 }
696
697 // Oop that keeps the metadata for this class from being unloaded
698 // in places where the metadata is stored in other places, like nmethods
699 oop klass_holder() const {
700 return is_anonymous() ? java_mirror() : class_loader();
701 }
702
703 // Load the klass_holder as a phantom. This is useful when a weak Klass
704 // pointer has been "peeked" and then must be kept alive before it may
705 // be used safely.
706 oop klass_holder_phantom();
707
708 bool is_contended() const {
709 return (_misc_flags & _misc_is_contended) != 0;
710 }
711 void set_is_contended(bool value) {
712 if (value) {
713 _misc_flags |= _misc_is_contended;
714 } else {
715 _misc_flags &= ~_misc_is_contended;
716 }
717 }
718
719 // source file name
720 Symbol* source_file_name() const {
721 return (_source_file_name_index == 0) ?
722 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
723 }
724 u2 source_file_name_index() const {
725 return _source_file_name_index;
726 }
727 void set_source_file_name_index(u2 sourcefile_index) {
728 _source_file_name_index = sourcefile_index;
729 }
730
731 // minor and major version numbers of class file
732 u2 minor_version() const { return _minor_version; }
733 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
734 u2 major_version() const { return _major_version; }
735 void set_major_version(u2 major_version) { _major_version = major_version; }
736
737 // source debug extension
738 const char* source_debug_extension() const { return _source_debug_extension; }
739 void set_source_debug_extension(const char* array, int length);
740
741 // symbol unloading support (refcount already added)
742 Symbol* array_name() { return _array_name; }
743 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
744
745 // nonstatic oop-map blocks
746 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
747 return oop_map_count * OopMapBlock::size_in_words();
748 }
749 unsigned int nonstatic_oop_map_count() const {
750 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
751 }
752 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
753 void set_nonstatic_oop_map_size(int words) {
754 _nonstatic_oop_map_size = words;
755 }
756
757 #if INCLUDE_JVMTI
758 // Redefinition locking. Class can only be redefined by one thread at a time.
759 bool is_being_redefined() const {
760 return (_extra_flags & _extra_is_being_redefined);
761 }
762 void set_is_being_redefined(bool value) {
763 if (value) {
764 _extra_flags |= _extra_is_being_redefined;
765 } else {
766 _extra_flags &= ~_extra_is_being_redefined;
767 }
768 }
769
770 // RedefineClasses() support for previous versions:
771 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
772 void purge_previous_version_list();
773
774 InstanceKlass* previous_versions() const { return _previous_versions; }
775 #else
776 InstanceKlass* previous_versions() const { return NULL; }
777 #endif
778
779 InstanceKlass* get_klass_version(int version) {
780 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
781 if (ik->constants()->version() == version) {
782 return ik;
783 }
784 }
785 return NULL;
786 }
787
788 bool has_been_redefined() const {
789 return (_misc_flags & _misc_has_been_redefined) != 0;
790 }
791 void set_has_been_redefined() {
792 _misc_flags |= _misc_has_been_redefined;
793 }
794
795 bool has_passed_fingerprint_check() const {
796 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
797 }
798 void set_has_passed_fingerprint_check(bool b) {
799 if (b) {
800 _misc_flags |= _misc_has_passed_fingerprint_check;
801 } else {
802 _misc_flags &= ~_misc_has_passed_fingerprint_check;
803 }
804 }
805 bool supers_have_passed_fingerprint_checks();
806
807 static bool should_store_fingerprint(bool is_anonymous);
808 bool should_store_fingerprint() const { return should_store_fingerprint(is_anonymous()); }
809 bool has_stored_fingerprint() const;
810 uint64_t get_stored_fingerprint() const;
811 void store_fingerprint(uint64_t fingerprint);
812
813 bool is_scratch_class() const {
814 return (_misc_flags & _misc_is_scratch_class) != 0;
815 }
816
817 void set_is_scratch_class() {
818 _misc_flags |= _misc_is_scratch_class;
819 }
820
821 bool has_resolved_methods() const {
822 return (_extra_flags & _extra_has_resolved_methods) != 0;
823 }
824
825 void set_has_resolved_methods() {
826 _extra_flags |= _extra_has_resolved_methods;
827 }
828 private:
829
830 void set_kind(unsigned kind) {
831 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
832 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
833 unsigned flags = _misc_flags & ~fmask;
834 _misc_flags = (flags | (kind << _misc_kind_field_pos));
835 }
836
837 bool is_kind(unsigned desired) const {
838 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
839 return kind == desired;
840 }
841
842 public:
843
844 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
845 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
846 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
847 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
848 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
849 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
850
851 #if INCLUDE_JVMTI
852
853 void init_previous_versions() {
854 _previous_versions = NULL;
855 }
856
857 private:
858 static bool _has_previous_versions;
859 public:
860 static void purge_previous_versions(InstanceKlass* ik) {
861 if (ik->has_been_redefined()) {
862 ik->purge_previous_version_list();
863 }
864 }
865
866 static bool has_previous_versions_and_reset();
867
868 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
869 void set_cached_class_file(JvmtiCachedClassFileData *data) {
870 _cached_class_file = data;
871 }
872 JvmtiCachedClassFileData * get_cached_class_file();
873 jint get_cached_class_file_len();
874 unsigned char * get_cached_class_file_bytes();
875
876 // JVMTI: Support for caching of field indices, types, and offsets
877 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
878 _jvmti_cached_class_field_map = descriptor;
879 }
880 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
881 return _jvmti_cached_class_field_map;
882 }
883
884 #if INCLUDE_CDS
885 void set_archived_class_data(JvmtiCachedClassFileData* data) {
886 _cached_class_file = data;
887 }
888
889 JvmtiCachedClassFileData * get_archived_class_data();
890 #endif // INCLUDE_CDS
891 #else // INCLUDE_JVMTI
892
893 static void purge_previous_versions(InstanceKlass* ik) { return; };
894 static bool has_previous_versions_and_reset() { return false; }
895
896 void set_cached_class_file(JvmtiCachedClassFileData *data) {
897 assert(data == NULL, "unexpected call with JVMTI disabled");
898 }
899 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
900
901 #endif // INCLUDE_JVMTI
902
903 bool has_nonstatic_concrete_methods() const {
904 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
905 }
906 void set_has_nonstatic_concrete_methods(bool b) {
907 if (b) {
908 _misc_flags |= _misc_has_nonstatic_concrete_methods;
909 } else {
910 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
911 }
912 }
913
914 bool declares_nonstatic_concrete_methods() const {
915 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
916 }
917 void set_declares_nonstatic_concrete_methods(bool b) {
918 if (b) {
919 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
920 } else {
921 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
922 }
923 }
924
925 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
926 inline u2 next_method_idnum();
927 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
928
929 // generics support
930 Symbol* generic_signature() const {
931 return (_generic_signature_index == 0) ?
932 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
933 }
934 u2 generic_signature_index() const {
935 return _generic_signature_index;
936 }
937 void set_generic_signature_index(u2 sig_index) {
938 _generic_signature_index = sig_index;
939 }
940
941 u2 enclosing_method_data(int offset) const;
942 u2 enclosing_method_class_index() const {
943 return enclosing_method_data(enclosing_method_class_index_offset);
944 }
945 u2 enclosing_method_method_index() {
946 return enclosing_method_data(enclosing_method_method_index_offset);
947 }
948 void set_enclosing_method_indices(u2 class_index,
949 u2 method_index);
950
951 // jmethodID support
952 jmethodID get_jmethod_id(const methodHandle& method_h);
953 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
954 jmethodID new_id, jmethodID* new_jmeths,
955 jmethodID* to_dealloc_id_p,
956 jmethodID** to_dealloc_jmeths_p);
957 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
958 size_t *length_p, jmethodID* id_p);
959 void ensure_space_for_methodids(int start_offset = 0);
960 jmethodID jmethod_id_or_null(Method* method);
961
962 // annotations support
963 Annotations* annotations() const { return _annotations; }
964 void set_annotations(Annotations* anno) { _annotations = anno; }
965
966 AnnotationArray* class_annotations() const {
967 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
968 }
969 Array<AnnotationArray*>* fields_annotations() const {
970 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
971 }
972 AnnotationArray* class_type_annotations() const {
973 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
974 }
975 Array<AnnotationArray*>* fields_type_annotations() const {
976 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
977 }
978 // allocation
979 instanceOop allocate_instance(TRAPS);
980
981 // additional member function to return a handle
982 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
983
984 objArrayOop allocate_objArray(int n, int length, TRAPS);
985 // Helper function
986 static instanceOop register_finalizer(instanceOop i, TRAPS);
987
988 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
989 // if not, throw either an Error or an Exception.
990 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
991
992 // initialization
993 void call_class_initializer(TRAPS);
994 void set_initialization_state_and_notify(ClassState state, TRAPS);
995
996 // OopMapCache support
997 OopMapCache* oop_map_cache() { return _oop_map_cache; }
998 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
999 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
1000
1001 // JNI identifier support (for static fields - for jni performance)
1002 JNIid* jni_ids() { return _jni_ids; }
1003 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
1004 JNIid* jni_id_for(int offset);
1005
1006 // maintenance of deoptimization dependencies
1007 inline DependencyContext dependencies();
1008 int mark_dependent_nmethods(KlassDepChange& changes);
1009 void add_dependent_nmethod(nmethod* nm);
1010 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
1011
1012 // On-stack replacement support
1013 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1014 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1015 void add_osr_nmethod(nmethod* n);
1016 bool remove_osr_nmethod(nmethod* n);
1017 int mark_osr_nmethods(const Method* m);
1018 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1019
1020 #if INCLUDE_JVMTI
1021 // Breakpoint support (see methods on Method* for details)
1022 BreakpointInfo* breakpoints() const { return _breakpoints; };
1023 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1024 #endif
1025
1026 // support for stub routines
1027 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1028 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
1029 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1030
1031 // subclass/subinterface checks
1032 bool implements_interface(Klass* k) const;
1033 bool is_same_or_direct_interface(Klass* k) const;
1034
1035 #ifdef ASSERT
1036 // check whether this class or one of its superclasses was redefined
1037 bool has_redefined_this_or_super() const;
1038 #endif
1039
1040 // Access to the implementor of an interface.
1041 Klass* implementor() const
1042 {
1043 Klass** k = adr_implementor();
1044 if (k == NULL) {
1045 return NULL;
1046 } else {
1047 return *k;
1048 }
1049 }
1050
1051 void set_implementor(Klass* k) {
1052 assert(is_interface(), "not interface");
1053 Klass** addr = adr_implementor();
1054 assert(addr != NULL, "null addr");
1055 if (addr != NULL) {
1056 *addr = k;
1057 }
1058 }
1059
1060 int nof_implementors() const {
1061 Klass* k = implementor();
1062 if (k == NULL) {
1063 return 0;
1064 } else if (k != this) {
1065 return 1;
1066 } else {
1067 return 2;
1068 }
1069 }
1070
1071 void add_implementor(Klass* k); // k is a new class that implements this interface
1072 void init_implementor(); // initialize
1073
1074 // link this class into the implementors list of every interface it implements
1075 void process_interfaces(Thread *thread);
1076
1077 // virtual operations from Klass
1078 bool is_leaf_class() const { return _subklass == NULL; }
1079 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1080 bool compute_is_subtype_of(Klass* k);
1081 bool can_be_primary_super_slow() const;
1082 int oop_size(oop obj) const { return size_helper(); }
1083 // slow because it's a virtual call and used for verifying the layout_helper.
1084 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1085 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1086
1087 // Iterators
1088 void do_local_static_fields(FieldClosure* cl);
1089 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1090 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1091
1092 void methods_do(void f(Method* method));
1093 void array_klasses_do(void f(Klass* k));
1094 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1095 bool super_types_do(SuperTypeClosure* blk);
1096
1097 static InstanceKlass* cast(Klass* k) {
1098 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1099 }
1100
1101 static const InstanceKlass* cast(const Klass* k) {
1102 assert(k != NULL, "k should not be null");
1103 assert(k->is_instance_klass(), "cast to InstanceKlass");
1104 return static_cast<const InstanceKlass*>(k);
1105 }
1106
1107 InstanceKlass* java_super() const {
1108 return (super() == NULL) ? NULL : cast(super());
1109 }
1110
1111 // Sizing (in words)
1112 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1113
1114 static int size(int vtable_length, int itable_length,
1115 int nonstatic_oop_map_size,
1116 bool is_interface, bool is_anonymous, bool has_stored_fingerprint,
1117 int java_fields, bool is_value_type) {
1118 return align_metadata_size(header_size() +
1119 vtable_length +
1120 itable_length +
1121 nonstatic_oop_map_size +
1122 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1123 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1124 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1125 (java_fields * (int)sizeof(Klass*)/wordSize) +
1126 (is_value_type ? (int)sizeof(struct ValueKlassFixedBlock) : 0));
1127 }
1128 int size() const { return size(vtable_length(),
1129 itable_length(),
1130 nonstatic_oop_map_size(),
1131 is_interface(),
1132 is_anonymous(),
1133 has_stored_fingerprint(),
1134 has_value_fields() ? java_fields_count() : 0,
1135 is_value());
1136 }
1137 #if INCLUDE_SERVICES
1138 virtual void collect_statistics(KlassSizeStats *sz) const;
1139 #endif
1140
1141 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1142 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1143
1144 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1145
1146 address static_field_addr(int offset);
1147
1148 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1149
1150 OopMapBlock* start_of_nonstatic_oop_maps() const {
1151 return (OopMapBlock*)(start_of_itable() + itable_length());
1152 }
1153
1154 Klass** end_of_nonstatic_oop_maps() const {
1155 return (Klass**)(start_of_nonstatic_oop_maps() +
1156 nonstatic_oop_map_count());
1157 }
1158
1159 Klass** adr_implementor() const {
1160 if (is_interface()) {
1161 return (Klass**)end_of_nonstatic_oop_maps();
1162 } else {
1163 return NULL;
1164 }
1165 };
1166
1167 InstanceKlass** adr_host_klass() const {
1168 if (is_anonymous()) {
1169 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1170 if (adr_impl != NULL) {
1171 return adr_impl + 1;
1172 } else {
1173 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1174 }
1175 } else {
1176 return NULL;
1177 }
1178 }
1179
1180 address adr_fingerprint() const {
1181 if (has_stored_fingerprint()) {
1182 InstanceKlass** adr_host = adr_host_klass();
1183 if (adr_host != NULL) {
1184 return (address)(adr_host + 1);
1185 }
1186
1187 Klass** adr_impl = adr_implementor();
1188 if (adr_impl != NULL) {
1189 return (address)(adr_impl + 1);
1190 }
1191
1192 return (address)end_of_nonstatic_oop_maps();
1193 } else {
1194 return NULL;
1195 }
1196 }
1197
1198 address adr_value_fields_klasses() const {
1199 if (has_value_fields()) {
1200 address adr_fing = adr_fingerprint();
1201 if (adr_fing != NULL) {
1202 return adr_fingerprint() + sizeof(u8);
1203 }
1204
1205 InstanceKlass** adr_host = adr_host_klass();
1206 if (adr_host != NULL) {
1207 return (address)(adr_host + 1);
1208 }
1209
1210 Klass** adr_impl = adr_implementor();
1211 if (adr_impl != NULL) {
1212 return (address)(adr_impl + 1);
1213 }
1214
1215 return (address)end_of_nonstatic_oop_maps();
1216 } else {
1217 return NULL;
1218 }
1219 }
1220
1221 Klass* get_value_field_klass(int idx) const {
1222 assert(has_value_fields(), "Sanity checking");
1223 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1224 assert(k != NULL, "Should always be set before being read");
1225 assert(k->is_value(), "Must be a value type");
1226 return k;
1227 }
1228
1229 Klass* get_value_field_klass_or_null(int idx) const {
1230 assert(has_value_fields(), "Sanity checking");
1231 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1232 assert(k == NULL || k->is_value(), "Must be a value type");
1233 return k;
1234 }
1235
1236 void set_value_field_klass(int idx, Klass* k) {
1237 assert(has_value_fields(), "Sanity checking");
1238 assert(k != NULL, "Should not be set to NULL");
1239 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1240 ((Klass**)adr_value_fields_klasses())[idx] = k;
1241 }
1242
1243 // Use this to return the size of an instance in heap words:
1244 virtual int size_helper() const {
1245 return layout_helper_to_size_helper(layout_helper());
1246 }
1247
1248 // This bit is initialized in classFileParser.cpp.
1249 // It is false under any of the following conditions:
1250 // - the class is abstract (including any interface)
1251 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1252 // - the class size is larger than FastAllocateSizeLimit
1253 // - the class is java/lang/Class, which cannot be allocated directly
1254 bool can_be_fastpath_allocated() const {
1255 return !layout_helper_needs_slow_path(layout_helper());
1256 }
1257
1258 // Java itable
1259 klassItable itable() const; // return klassItable wrapper
1260 Method* method_at_itable(Klass* holder, int index, TRAPS);
1261
1262 #if INCLUDE_JVMTI
1263 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1264 #endif // INCLUDE_JVMTI
1265
1266 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1267 void clean_implementors_list(BoolObjectClosure* is_alive);
1268 void clean_method_data(BoolObjectClosure* is_alive);
1269
1270 // Explicit metaspace deallocation of fields
1271 // For RedefineClasses and class file parsing errors, we need to deallocate
1272 // instanceKlasses and the metadata they point to.
1273 void deallocate_contents(ClassLoaderData* loader_data);
1274 static void deallocate_methods(ClassLoaderData* loader_data,
1275 Array<Method*>* methods);
1276 void static deallocate_interfaces(ClassLoaderData* loader_data,
1277 const Klass* super_klass,
1278 Array<Klass*>* local_interfaces,
1279 Array<Klass*>* transitive_interfaces);
1280
1281 // The constant pool is on stack if any of the methods are executing or
1282 // referenced by handles.
1283 bool on_stack() const { return _constants->on_stack(); }
1284
1285 // callbacks for actions during class unloading
1286 static void notify_unload_class(InstanceKlass* ik);
1287 static void release_C_heap_structures(InstanceKlass* ik);
1288
1289 // Naming
1290 const char* signature_name() const;
1291 static Symbol* package_from_name(const Symbol* name, TRAPS);
1292
1293 // GC specific object visitors
1294 //
1295 #if INCLUDE_ALL_GCS
1296 // Parallel Scavenge
1297 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1298 // Parallel Compact
1299 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1300 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1301 #endif
1302
1303 // Oop fields (and metadata) iterators
1304 // [nv = true] Use non-virtual calls to do_oop_nv.
1305 // [nv = false] Use virtual calls to do_oop.
1306 //
1307 // The InstanceKlass iterators also visits the Object's klass.
1308
1309 // Forward iteration
1310 public:
1311 // Iterate over all oop fields in the oop maps.
1312 template <bool nv, class OopClosureType>
1313 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1314
1315 protected:
1316 // Iterate over all oop fields and metadata.
1317 template <bool nv, class OopClosureType>
1318 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1319
1320 private:
1321 // Iterate over all oop fields in the oop maps.
1322 // Specialized for [T = oop] or [T = narrowOop].
1323 template <bool nv, typename T, class OopClosureType>
1324 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1325
1326 // Iterate over all oop fields in one oop map.
1327 template <bool nv, typename T, class OopClosureType>
1328 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1329
1330
1331 // Reverse iteration
1332 #if INCLUDE_ALL_GCS
1333 public:
1334 // Iterate over all oop fields in the oop maps.
1335 template <bool nv, class OopClosureType>
1336 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1337
1338 protected:
1339 // Iterate over all oop fields and metadata.
1340 template <bool nv, class OopClosureType>
1341 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1342
1343 private:
1344 // Iterate over all oop fields in the oop maps.
1345 // Specialized for [T = oop] or [T = narrowOop].
1346 template <bool nv, typename T, class OopClosureType>
1347 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1348
1349 // Iterate over all oop fields in one oop map.
1350 template <bool nv, typename T, class OopClosureType>
1351 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1352 #endif
1353
1354
1355 // Bounded range iteration
1356 public:
1357 // Iterate over all oop fields in the oop maps.
1358 template <bool nv, class OopClosureType>
1359 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1360
1361 protected:
1362 // Iterate over all oop fields and metadata.
1363 template <bool nv, class OopClosureType>
1364 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1365
1366 private:
1367 // Iterate over all oop fields in the oop maps.
1368 // Specialized for [T = oop] or [T = narrowOop].
1369 template <bool nv, typename T, class OopClosureType>
1370 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1371
1372 // Iterate over all oop fields in one oop map.
1373 template <bool nv, typename T, class OopClosureType>
1374 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1375
1376
1377 public:
1378
1379 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1380 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1381
1382 #if INCLUDE_ALL_GCS
1383 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1384 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1385 #endif // INCLUDE_ALL_GCS
1386
1387 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1388
1389 public:
1390 void set_in_error_state() {
1391 assert(DumpSharedSpaces, "only call this when dumping archive");
1392 _init_state = initialization_error;
1393 }
1394 bool check_sharing_error_state();
1395
1396 private:
1397 // initialization state
1398 #ifdef ASSERT
1399 void set_init_state(ClassState state);
1400 #else
1401 void set_init_state(ClassState state) { _init_state = (u1)state; }
1402 #endif
1403 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1404 void set_init_thread(Thread *thread) { _init_thread = thread; }
1405
1406 // The RedefineClasses() API can cause new method idnums to be needed
1407 // which will cause the caches to grow. Safety requires different
1408 // cache management logic if the caches can grow instead of just
1409 // going from NULL to non-NULL.
1410 bool idnum_can_increment() const { return has_been_redefined(); }
1411 inline jmethodID* methods_jmethod_ids_acquire() const;
1412 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1413
1414 // Lock during initialization
1415 public:
1416 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1417 // Must be one per class and it has to be a VM internal object so java code
1418 // cannot lock it (like the mirror).
1419 // It has to be an object not a Mutex because it's held through java calls.
1420 oop init_lock() const;
1421 private:
1422 void fence_and_clear_init_lock();
1423
1424 bool link_class_impl (bool throw_verifyerror, TRAPS);
1425 bool verify_code (bool throw_verifyerror, TRAPS);
1426 void initialize_impl (TRAPS);
1427 void initialize_super_interfaces (TRAPS);
1428 void eager_initialize_impl ();
1429 /* jni_id_for_impl for jfieldID only */
1430 JNIid* jni_id_for_impl (int offset);
1431 protected:
1432 // Returns the array class for the n'th dimension
1433 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
1434
1435 // Returns the array class with this class as element type
1436 virtual Klass* array_klass_impl(bool or_null, TRAPS);
1437
1438 private:
1439
1440 // find a local method (returns NULL if not found)
1441 Method* find_method_impl(const Symbol* name,
1442 const Symbol* signature,
1443 OverpassLookupMode overpass_mode,
1444 StaticLookupMode static_mode,
1445 PrivateLookupMode private_mode) const;
1446
1447 static Method* find_method_impl(const Array<Method*>* methods,
1448 const Symbol* name,
1449 const Symbol* signature,
1450 OverpassLookupMode overpass_mode,
1451 StaticLookupMode static_mode,
1452 PrivateLookupMode private_mode);
1453
1454 // Free CHeap allocated fields.
1455 void release_C_heap_structures();
1456
1457 #if INCLUDE_JVMTI
1458 // RedefineClasses support
1459 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1460 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1461 #endif
1462 public:
1463 // CDS support - remove and restore oops from metadata. Oops are not shared.
1464 virtual void remove_unshareable_info();
1465 virtual void remove_java_mirror();
1466 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1467
1468 // jvm support
1469 jint compute_modifier_flags(TRAPS) const;
1470
1471 public:
1472 // JVMTI support
1473 jint jvmti_class_status() const;
1474
1475 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1476
1477 public:
1478 // Printing
1479 #ifndef PRODUCT
1480 void print_on(outputStream* st) const;
1481 #endif
1482 void print_value_on(outputStream* st) const;
1483
1484 void oop_print_value_on(oop obj, outputStream* st);
1485
1486 #ifndef PRODUCT
1487 void oop_print_on (oop obj, outputStream* st);
1488
1489 void print_dependent_nmethods(bool verbose = false);
1490 bool is_dependent_nmethod(nmethod* nm);
1491 #endif
1492
1493 const char* internal_name() const;
1494
1495 // Verification
1496 void verify_on(outputStream* st);
1497
1498 void oop_verify_on(oop obj, outputStream* st);
1499
1500 // Logging
1501 void print_class_load_logging(ClassLoaderData* loader_data,
1502 const char* module_name,
1503 const ClassFileStream* cfs) const;
1504 };
1505
1506 // for adding methods
1507 // UNSET_IDNUM return means no more ids available
1508 inline u2 InstanceKlass::next_method_idnum() {
1509 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1510 return ConstMethod::UNSET_IDNUM; // no more ids available
1511 } else {
1512 return _idnum_allocated_count++;
1513 }
1514 }
1515
1516
1517 /* JNIid class for jfieldIDs only */
1518 class JNIid: public CHeapObj<mtClass> {
1519 friend class VMStructs;
1520 private:
1521 Klass* _holder;
1522 JNIid* _next;
1523 int _offset;
1524 #ifdef ASSERT
1525 bool _is_static_field_id;
1526 #endif
1527
1528 public:
1529 // Accessors
1530 Klass* holder() const { return _holder; }
1531 int offset() const { return _offset; }
1532 JNIid* next() { return _next; }
1533 // Constructor
1534 JNIid(Klass* holder, int offset, JNIid* next);
1535 // Identifier lookup
1536 JNIid* find(int offset);
1537
1538 bool find_local_field(fieldDescriptor* fd) {
1539 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1540 }
1541
1542 static void deallocate(JNIid* id);
1543 // Debugging
1544 #ifdef ASSERT
1545 bool is_static_field_id() const { return _is_static_field_id; }
1546 void set_is_static_field_id() { _is_static_field_id = true; }
1547 #endif
1548 void verify(Klass* holder);
1549 };
1550
1551 // An iterator that's used to access the inner classes indices in the
1552 // InstanceKlass::_inner_classes array.
1553 class InnerClassesIterator : public StackObj {
1554 private:
1555 Array<jushort>* _inner_classes;
1556 int _length;
1557 int _idx;
1558 public:
1559
1560 InnerClassesIterator(const InstanceKlass* k) {
1561 _inner_classes = k->inner_classes();
1562 if (k->inner_classes() != NULL) {
1563 _length = _inner_classes->length();
1564 // The inner class array's length should be the multiple of
1565 // inner_class_next_offset if it only contains the InnerClasses
1566 // attribute data, or it should be
1567 // n*inner_class_next_offset+enclosing_method_attribute_size
1568 // if it also contains the EnclosingMethod data.
1569 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1570 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1571 "just checking");
1572 // Remove the enclosing_method portion if exists.
1573 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1574 _length -= InstanceKlass::enclosing_method_attribute_size;
1575 }
1576 } else {
1577 _length = 0;
1578 }
1579 _idx = 0;
1580 }
1581
1582 int length() const {
1583 return _length;
1584 }
1585
1586 void next() {
1587 _idx += InstanceKlass::inner_class_next_offset;
1588 }
1589
1590 bool done() const {
1591 return (_idx >= _length);
1592 }
1593
1594 u2 inner_class_info_index() const {
1595 return _inner_classes->at(
1596 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1597 }
1598
1599 void set_inner_class_info_index(u2 index) {
1600 _inner_classes->at_put(
1601 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1602 }
1603
1604 u2 outer_class_info_index() const {
1605 return _inner_classes->at(
1606 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1607 }
1608
1609 void set_outer_class_info_index(u2 index) {
1610 _inner_classes->at_put(
1611 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1612 }
1613
1614 u2 inner_name_index() const {
1615 return _inner_classes->at(
1616 _idx + InstanceKlass::inner_class_inner_name_offset);
1617 }
1618
1619 void set_inner_name_index(u2 index) {
1620 _inner_classes->at_put(
1621 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1622 }
1623
1624 u2 inner_access_flags() const {
1625 return _inner_classes->at(
1626 _idx + InstanceKlass::inner_class_access_flags_offset);
1627 }
1628 };
1629
1630 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP