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/bitMap.inline.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 MemberNameTable;
71 class SuperTypeClosure;
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_size_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 // Annotations for this class
163 Annotations* _annotations;
164 // Package this class is defined in
165 PackageEntry* _package_entry;
166 // Array classes holding elements of this class.
167 Klass* volatile _array_klasses;
168 // Constant pool for this class.
169 ConstantPool* _constants;
170 // The InnerClasses attribute and EnclosingMethod attribute. The
171 // _inner_classes is an array of shorts. If the class has InnerClasses
172 // attribute, then the _inner_classes array begins with 4-tuples of shorts
173 // [inner_class_info_index, outer_class_info_index,
174 // inner_name_index, inner_class_access_flags] for the InnerClasses
175 // attribute. If the EnclosingMethod attribute exists, it occupies the
176 // last two shorts [class_index, method_index] of the array. If only
177 // the InnerClasses attribute exists, the _inner_classes array length is
178 // number_of_inner_classes * 4. If the class has both InnerClasses
179 // and EnclosingMethod attributes the _inner_classes array length is
180 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
181 Array<jushort>* _inner_classes;
182
183 // the source debug extension for this klass, NULL if not specified.
184 // Specified as UTF-8 string without terminating zero byte in the classfile,
185 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
186 const char* _source_debug_extension;
187 // Array name derived from this class which needs unreferencing
188 // if this class is unloaded.
189 Symbol* _array_name;
190
191 // Number of heapOopSize words used by non-static fields in this klass
192 // (including inherited fields but after header_size()).
193 int _nonstatic_field_size;
194 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
195 // Constant pool index to the utf8 entry of the Generic signature,
196 // or 0 if none.
197 u2 _generic_signature_index;
198 // Constant pool index to the utf8 entry for the name of source file
199 // containing this klass, 0 if not specified.
200 u2 _source_file_name_index;
201 u2 _static_oop_field_count;// number of static oop fields in this klass
202 u2 _java_fields_count; // The number of declared Java fields
203 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
204
205 int _itable_len; // length of Java itable (in words)
206 // _is_marked_dependent can be set concurrently, thus cannot be part of the
207 // _misc_flags.
208 bool _is_marked_dependent; // used for marking during flushing and deoptimization
209
210 public:
211 enum {
212 _extra_is_being_redefined = 1 << 0, // used for locking redefinition
213 _extra_has_value_fields = 1 << 1, // has value fields and related embedded section is not empty
214 _extra_is_bufferable = 1 << 2, // value can be buffered out side of the Java heap
215 _extra_has_vcc_klass = 1 << 3 // has a pointer to its Value Capable Class (MVT)
216 };
217
218 protected:
219 u1 _extra_flags;
220
221 // The low three bits of _misc_flags contains the kind field.
222 // This can be used to quickly discriminate among the five kinds of
223 // InstanceKlass.
224
225 static const unsigned _misc_kind_field_size = 3;
226 static const unsigned _misc_kind_field_pos = 0;
227 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
228
229 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
230 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
231 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
232 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
233 static const unsigned _misc_kind_value_type = 4; // ValueKlass
234
235 // Start after _misc_kind field.
236 enum {
237 _misc_rewritten = 1 << 3, // methods rewritten.
238 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops
239 _misc_should_verify_class = 1 << 5, // allow caching of preverification
240 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field
241 _misc_is_contended = 1 << 7, // marked with contended annotation
242 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods
243 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods
244 _misc_has_been_redefined = 1 << 10, // class has been redefined
245 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its
246 // code source was found to be matching the value recorded by AOT.
247 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class
248 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader
249 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader
250 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader
251 };
252 u2 loader_type_bits() {
253 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
254 }
255 u2 _misc_flags;
256 u2 _minor_version; // minor version number of class file
257 u2 _major_version; // major version number of class file
258 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
259 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
260 MemberNameTable* _member_names; // Member names
261 JNIid* _jni_ids; // First JNI identifier for static fields in this class
262 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
263 intptr_t _dep_context; // packed DependencyContext structure
264 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
265 #if INCLUDE_JVMTI
266 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
267 // Linked instanceKlasses of previous versions
268 InstanceKlass* _previous_versions;
269 // JVMTI fields can be moved to their own structure - see 6315920
270 // JVMTI: cached class file, before retransformable agent modified it in CFLH
271 JvmtiCachedClassFileData* _cached_class_file;
272 #endif
273
274 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
275
276 // Class states are defined as ClassState (see above).
277 // Place the _init_state here to utilize the unused 2-byte after
278 // _idnum_allocated_count.
279 u1 _init_state; // state of class
280 u1 _reference_type; // reference type
281
282 #if INCLUDE_JVMTI
283 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
284 #endif
285
286 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
287
288 // Method array.
289 Array<Method*>* _methods;
290 // Default Method Array, concrete methods inherited from interfaces
291 Array<Method*>* _default_methods;
292 // Interface (Klass*s) this class declares locally to implement.
293 Array<Klass*>* _local_interfaces;
294 // Interface (Klass*s) this class implements transitively.
295 Array<Klass*>* _transitive_interfaces;
296 // Int array containing the original order of method in the class file (for JVMTI).
297 Array<int>* _method_ordering;
298 // Int array containing the vtable_indices for default_methods
299 // offset matches _default_methods offset
300 Array<int>* _default_vtable_indices;
301
302 // Instance and static variable information, starts with 6-tuples of shorts
303 // [access, name index, sig index, initval index, low_offset, high_offset]
304 // for all fields, followed by the generic signature data at the end of
305 // the array. Only fields with generic signature attributes have the generic
306 // signature data set in the array. The fields array looks like following:
307 //
308 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
309 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
310 // ...
311 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
312 // [generic signature index]
313 // [generic signature index]
314 // ...
315 Array<u2>* _fields;
316
317 // embedded Java vtable follows here
318 // embedded Java itables follows here
319 // embedded static fields follows here
320 // embedded nonstatic oop-map blocks follows here
321 // embedded implementor of this interface follows here
322 // The embedded implementor only exists if the current klass is an
323 // iterface. The possible values of the implementor fall into following
324 // three cases:
325 // NULL: no implementor.
326 // A Klass* that's not itself: one implementor.
327 // Itself: more than one implementors.
328 // embedded host klass follows here
329 // The embedded host klass only exists in an anonymous class for
330 // dynamic language support (JSR 292 enabled). The host class grants
331 // its access privileges to this class also. The host class is either
332 // named, or a previously loaded anonymous class. A non-anonymous class
333 // or an anonymous class loaded through normal classloading does not
334 // have this embedded field.
335 //
336
337 friend class SystemDictionary;
338
339 public:
340 u2 loader_type() {
341 return _misc_flags & loader_type_bits();
342 }
343
344 bool is_shared_boot_class() const {
345 return (_misc_flags & _misc_is_shared_boot_class) != 0;
346 }
347 bool is_shared_platform_class() const {
348 return (_misc_flags & _misc_is_shared_platform_class) != 0;
349 }
350 bool is_shared_app_class() const {
351 return (_misc_flags & _misc_is_shared_app_class) != 0;
352 }
353
354 void set_class_loader_type(s2 loader_type) {
355 assert(( _misc_flags & loader_type_bits()) == 0,
356 "Should only be called once for each class.");
357 switch (loader_type) {
358 case ClassLoader::BOOT_LOADER:
359 _misc_flags |= _misc_is_shared_boot_class;
360 break;
361 case ClassLoader::PLATFORM_LOADER:
362 _misc_flags |= _misc_is_shared_platform_class;
363 break;
364 case ClassLoader::APP_LOADER:
365 _misc_flags |= _misc_is_shared_app_class;
366 break;
367 default:
368 ShouldNotReachHere();
369 break;
370 }
371 }
372
373 bool has_nonstatic_fields() const {
374 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
375 }
376 void set_has_nonstatic_fields(bool b) {
377 if (b) {
378 _misc_flags |= _misc_has_nonstatic_fields;
379 } else {
380 _misc_flags &= ~_misc_has_nonstatic_fields;
381 }
382 }
383
384 bool has_value_fields() const {
385 return (_extra_flags & _extra_has_value_fields) != 0;
386 }
387 void set_has_value_fields() {
388 _extra_flags |= _extra_has_value_fields;
389 }
390
391 bool has_vcc_klass() const {
392 return (_extra_flags & _extra_has_vcc_klass) != 0;
393 }
394 void set_has_vcc_klass() {
395 _extra_flags |= _extra_has_vcc_klass;
396 }
397
398
399 // field sizes
400 int nonstatic_field_size() const { return _nonstatic_field_size; }
401 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
402
403 int static_field_size() const { return _static_field_size; }
404 void set_static_field_size(int size) { _static_field_size = size; }
405
406 int static_oop_field_count() const { return (int)_static_oop_field_count; }
407 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
408
409 // Java itable
410 int itable_length() const { return _itable_len; }
411 void set_itable_length(int len) { _itable_len = len; }
412
413 // array klasses
414 Klass* array_klasses() const { return _array_klasses; }
415 inline Klass* array_klasses_acquire() const; // load with acquire semantics
416 void set_array_klasses(Klass* k) { _array_klasses = k; }
417 inline void release_set_array_klasses(Klass* k); // store with release semantics
418
419 // methods
420 Array<Method*>* methods() const { return _methods; }
421 void set_methods(Array<Method*>* a) { _methods = a; }
422 Method* method_with_idnum(int idnum);
423 Method* method_with_orig_idnum(int idnum);
424 Method* method_with_orig_idnum(int idnum, int version);
425
426 // method ordering
427 Array<int>* method_ordering() const { return _method_ordering; }
428 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
429 void copy_method_ordering(const intArray* m, TRAPS);
430
431 // default_methods
432 Array<Method*>* default_methods() const { return _default_methods; }
433 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
434
435 // default method vtable_indices
436 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
437 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
438 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
439
440 // interfaces
441 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
442 void set_local_interfaces(Array<Klass*>* a) {
443 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
444 _local_interfaces = a; }
445
446 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
447 void set_transitive_interfaces(Array<Klass*>* a) {
448 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
449 _transitive_interfaces = a;
450 }
451
452 private:
453 friend class fieldDescriptor;
454 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
455
456 public:
457 int field_offset (int index) const { return field(index)->offset(); }
458 int field_access_flags(int index) const { return field(index)->access_flags(); }
459 Symbol* field_name (int index) const { return field(index)->name(constants()); }
460 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
461
462 // Number of Java declared fields
463 int java_fields_count() const { return (int)_java_fields_count; }
464
465 Array<u2>* fields() const { return _fields; }
466 void set_fields(Array<u2>* f, u2 java_fields_count) {
467 guarantee(_fields == NULL || f == NULL, "Just checking");
468 _fields = f;
469 _java_fields_count = java_fields_count;
470 }
471
472 // inner classes
473 Array<u2>* inner_classes() const { return _inner_classes; }
474 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
475
476 enum InnerClassAttributeOffset {
477 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
478 inner_class_inner_class_info_offset = 0,
479 inner_class_outer_class_info_offset = 1,
480 inner_class_inner_name_offset = 2,
481 inner_class_access_flags_offset = 3,
482 inner_class_next_offset = 4
483 };
484
485 enum EnclosingMethodAttributeOffset {
486 enclosing_method_class_index_offset = 0,
487 enclosing_method_method_index_offset = 1,
488 enclosing_method_attribute_size = 2
489 };
490
491 // method override check
492 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
493
494 // package
495 PackageEntry* package() const { return _package_entry; }
496 ModuleEntry* module() const;
497 bool in_unnamed_package() const { return (_package_entry == NULL); }
498 void set_package(PackageEntry* p) { _package_entry = p; }
499 void set_package(ClassLoaderData* loader_data, TRAPS);
500 bool is_same_class_package(const Klass* class2) const;
501 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
502 static bool is_same_class_package(oop class_loader1,
503 const Symbol* class_name1,
504 oop class_loader2,
505 const Symbol* class_name2);
506
507 // find an enclosing class
508 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
509
510 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
511 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
512
513 private:
514 // Check prohibited package ("java/" only loadable by boot or platform loaders)
515 static void check_prohibited_package(Symbol* class_name,
516 Handle class_loader,
517 TRAPS);
518 public:
519 // tell if two classes have the same enclosing class (at package level)
520 bool is_same_package_member(const Klass* class2, TRAPS) const;
521
522 // initialization state
523 bool is_loaded() const { return _init_state >= loaded; }
524 bool is_linked() const { return _init_state >= linked; }
525 bool is_initialized() const { return _init_state == fully_initialized; }
526 bool is_not_initialized() const { return _init_state < being_initialized; }
527 bool is_being_initialized() const { return _init_state == being_initialized; }
528 bool is_in_error_state() const { return _init_state == initialization_error; }
529 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
530 ClassState init_state() { return (ClassState)_init_state; }
531 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
532
533 // defineClass specified verification
534 bool should_verify_class() const {
535 return (_misc_flags & _misc_should_verify_class) != 0;
536 }
537 void set_should_verify_class(bool value) {
538 if (value) {
539 _misc_flags |= _misc_should_verify_class;
540 } else {
541 _misc_flags &= ~_misc_should_verify_class;
542 }
543 }
544
545 // marking
546 bool is_marked_dependent() const { return _is_marked_dependent; }
547 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
548
549 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); }
550
551 // initialization (virtuals from Klass)
552 bool should_be_initialized() const; // means that initialize should be called
553 void initialize(TRAPS);
554 void link_class(TRAPS);
555 bool link_class_or_fail(TRAPS); // returns false on failure
556 void unlink_class();
557 void rewrite_class(TRAPS);
558 void link_methods(TRAPS);
559 Method* class_initializer() const;
560
561 // set the class to initialized if no static initializer is present
562 void eager_initialize(Thread *thread);
563
564 // reference type
565 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
566 void set_reference_type(ReferenceType t) {
567 assert(t == (u1)t, "overflow");
568 _reference_type = (u1)t;
569 }
570
571 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
572
573 // find local field, returns true if found
574 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
575 // find field in direct superinterfaces, returns the interface in which the field is defined
576 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
577 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
578 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
579 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
580 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
581
582 // find a non-static or static field given its offset within the class.
583 bool contains_field_offset(int offset) {
584 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value());
585 }
586
587 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
588 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
589
590 // find a local method (returns NULL if not found)
591 Method* find_method(const Symbol* name, const Symbol* signature) const;
592 static Method* find_method(const Array<Method*>* methods,
593 const Symbol* name,
594 const Symbol* signature);
595
596 // find a local method, but skip static methods
597 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
598 static Method* find_instance_method(const Array<Method*>* methods,
599 const Symbol* name,
600 const Symbol* signature);
601
602 // find a local method (returns NULL if not found)
603 Method* find_local_method(const Symbol* name,
604 const Symbol* signature,
605 OverpassLookupMode overpass_mode,
606 StaticLookupMode static_mode,
607 PrivateLookupMode private_mode) const;
608
609 // find a local method from given methods array (returns NULL if not found)
610 static Method* find_local_method(const Array<Method*>* methods,
611 const Symbol* name,
612 const Symbol* signature,
613 OverpassLookupMode overpass_mode,
614 StaticLookupMode static_mode,
615 PrivateLookupMode private_mode);
616
617 // find a local method index in methods or default_methods (returns -1 if not found)
618 static int find_method_index(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 // lookup operation (returns NULL if not found)
626 Method* uncached_lookup_method(const Symbol* name,
627 const Symbol* signature,
628 OverpassLookupMode overpass_mode) const;
629
630 // lookup a method in all the interfaces that this class implements
631 // (returns NULL if not found)
632 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
633
634 // lookup a method in local defaults then in all interfaces
635 // (returns NULL if not found)
636 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
637
638 // Find method indices by name. If a method with the specified name is
639 // found the index to the first method is returned, and 'end' is filled in
640 // with the index of first non-name-matching method. If no method is found
641 // -1 is returned.
642 int find_method_by_name(const Symbol* name, int* end) const;
643 static int find_method_by_name(const Array<Method*>* methods,
644 const Symbol* name, int* end);
645
646 // constant pool
647 ConstantPool* constants() const { return _constants; }
648 void set_constants(ConstantPool* c) { _constants = c; }
649
650 // protection domain
651 oop protection_domain() const;
652
653 // signers
654 objArrayOop signers() const;
655
656 // host class
657 InstanceKlass* host_klass() const {
658 InstanceKlass** hk = adr_host_klass();
659 if (hk == NULL) {
660 return NULL;
661 } else {
662 assert(*hk != NULL, "host klass should always be set if the address is not null");
663 return *hk;
664 }
665 }
666 void set_host_klass(const InstanceKlass* host) {
667 assert(is_anonymous(), "not anonymous");
668 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
669 assert(addr != NULL, "no reversed space");
670 if (addr != NULL) {
671 *addr = host;
672 }
673 }
674 bool is_anonymous() const {
675 return (_misc_flags & _misc_is_anonymous) != 0;
676 }
677 void set_is_anonymous(bool value) {
678 if (value) {
679 _misc_flags |= _misc_is_anonymous;
680 } else {
681 _misc_flags &= ~_misc_is_anonymous;
682 }
683 }
684
685 // Oop that keeps the metadata for this class from being unloaded
686 // in places where the metadata is stored in other places, like nmethods
687 oop klass_holder() const {
688 return is_anonymous() ? java_mirror() : class_loader();
689 }
690
691 bool is_contended() const {
692 return (_misc_flags & _misc_is_contended) != 0;
693 }
694 void set_is_contended(bool value) {
695 if (value) {
696 _misc_flags |= _misc_is_contended;
697 } else {
698 _misc_flags &= ~_misc_is_contended;
699 }
700 }
701
702 // source file name
703 Symbol* source_file_name() const {
704 return (_source_file_name_index == 0) ?
705 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
706 }
707 u2 source_file_name_index() const {
708 return _source_file_name_index;
709 }
710 void set_source_file_name_index(u2 sourcefile_index) {
711 _source_file_name_index = sourcefile_index;
712 }
713
714 // minor and major version numbers of class file
715 u2 minor_version() const { return _minor_version; }
716 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
717 u2 major_version() const { return _major_version; }
718 void set_major_version(u2 major_version) { _major_version = major_version; }
719
720 // source debug extension
721 const char* source_debug_extension() const { return _source_debug_extension; }
722 void set_source_debug_extension(const char* array, int length);
723
724 // symbol unloading support (refcount already added)
725 Symbol* array_name() { return _array_name; }
726 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
727
728 // nonstatic oop-map blocks
729 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
730 return oop_map_count * OopMapBlock::size_in_words();
731 }
732 unsigned int nonstatic_oop_map_count() const {
733 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
734 }
735 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
736 void set_nonstatic_oop_map_size(int words) {
737 _nonstatic_oop_map_size = words;
738 }
739
740 #if INCLUDE_JVMTI
741 // Redefinition locking. Class can only be redefined by one thread at a time.
742 bool is_being_redefined() const {
743 return (_extra_flags & _extra_is_being_redefined);
744 }
745 void set_is_being_redefined(bool value) {
746 if (value) {
747 _extra_flags |= _extra_is_being_redefined;
748 } else {
749 _extra_flags &= ~_extra_is_being_redefined;
750 }
751 }
752
753 // RedefineClasses() support for previous versions:
754 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
755 void purge_previous_version_list();
756
757 InstanceKlass* previous_versions() const { return _previous_versions; }
758 #else
759 InstanceKlass* previous_versions() const { return NULL; }
760 #endif
761
762 InstanceKlass* get_klass_version(int version) {
763 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
764 if (ik->constants()->version() == version) {
765 return ik;
766 }
767 }
768 return NULL;
769 }
770
771 bool has_been_redefined() const {
772 return (_misc_flags & _misc_has_been_redefined) != 0;
773 }
774 void set_has_been_redefined() {
775 _misc_flags |= _misc_has_been_redefined;
776 }
777
778 bool has_passed_fingerprint_check() const {
779 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
780 }
781 void set_has_passed_fingerprint_check(bool b) {
782 if (b) {
783 _misc_flags |= _misc_has_passed_fingerprint_check;
784 } else {
785 _misc_flags &= ~_misc_has_passed_fingerprint_check;
786 }
787 }
788 bool supers_have_passed_fingerprint_checks();
789
790 static bool should_store_fingerprint();
791 bool has_stored_fingerprint() const;
792 uint64_t get_stored_fingerprint() const;
793 void store_fingerprint(uint64_t fingerprint);
794
795 bool is_scratch_class() const {
796 return (_misc_flags & _misc_is_scratch_class) != 0;
797 }
798
799 void set_is_scratch_class() {
800 _misc_flags |= _misc_is_scratch_class;
801 }
802
803 private:
804
805 void set_kind(unsigned kind) {
806 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
807 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
808 unsigned flags = _misc_flags & ~fmask;
809 _misc_flags = (flags | (kind << _misc_kind_field_pos));
810 }
811
812 bool is_kind(unsigned desired) const {
813 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
814 return kind == desired;
815 }
816
817 public:
818
819 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
820 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
821 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
822 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
823 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
824 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
825
826 #if INCLUDE_JVMTI
827
828 void init_previous_versions() {
829 _previous_versions = NULL;
830 }
831
832 private:
833 static bool _has_previous_versions;
834 public:
835 static void purge_previous_versions(InstanceKlass* ik) {
836 if (ik->has_been_redefined()) {
837 ik->purge_previous_version_list();
838 }
839 }
840
841 static bool has_previous_versions_and_reset();
842
843 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
844 void set_cached_class_file(JvmtiCachedClassFileData *data) {
845 _cached_class_file = data;
846 }
847 JvmtiCachedClassFileData * get_cached_class_file();
848 jint get_cached_class_file_len();
849 unsigned char * get_cached_class_file_bytes();
850
851 // JVMTI: Support for caching of field indices, types, and offsets
852 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
853 _jvmti_cached_class_field_map = descriptor;
854 }
855 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
856 return _jvmti_cached_class_field_map;
857 }
858
859 #if INCLUDE_CDS
860 void set_archived_class_data(JvmtiCachedClassFileData* data) {
861 _cached_class_file = data;
862 }
863
864 JvmtiCachedClassFileData * get_archived_class_data();
865 #endif // INCLUDE_CDS
866 #else // INCLUDE_JVMTI
867
868 static void purge_previous_versions(InstanceKlass* ik) { return; };
869 static bool has_previous_versions_and_reset() { return false; }
870
871 void set_cached_class_file(JvmtiCachedClassFileData *data) {
872 assert(data == NULL, "unexpected call with JVMTI disabled");
873 }
874 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
875
876 #endif // INCLUDE_JVMTI
877
878 bool has_nonstatic_concrete_methods() const {
879 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
880 }
881 void set_has_nonstatic_concrete_methods(bool b) {
882 if (b) {
883 _misc_flags |= _misc_has_nonstatic_concrete_methods;
884 } else {
885 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
886 }
887 }
888
889 bool declares_nonstatic_concrete_methods() const {
890 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
891 }
892 void set_declares_nonstatic_concrete_methods(bool b) {
893 if (b) {
894 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
895 } else {
896 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
897 }
898 }
899
900 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
901 inline u2 next_method_idnum();
902 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
903
904 // generics support
905 Symbol* generic_signature() const {
906 return (_generic_signature_index == 0) ?
907 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
908 }
909 u2 generic_signature_index() const {
910 return _generic_signature_index;
911 }
912 void set_generic_signature_index(u2 sig_index) {
913 _generic_signature_index = sig_index;
914 }
915
916 u2 enclosing_method_data(int offset) const;
917 u2 enclosing_method_class_index() const {
918 return enclosing_method_data(enclosing_method_class_index_offset);
919 }
920 u2 enclosing_method_method_index() {
921 return enclosing_method_data(enclosing_method_method_index_offset);
922 }
923 void set_enclosing_method_indices(u2 class_index,
924 u2 method_index);
925
926 // jmethodID support
927 jmethodID get_jmethod_id(const methodHandle& method_h);
928 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
929 jmethodID new_id, jmethodID* new_jmeths,
930 jmethodID* to_dealloc_id_p,
931 jmethodID** to_dealloc_jmeths_p);
932 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
933 size_t *length_p, jmethodID* id_p);
934 void ensure_space_for_methodids(int start_offset = 0);
935 jmethodID jmethod_id_or_null(Method* method);
936
937 // annotations support
938 Annotations* annotations() const { return _annotations; }
939 void set_annotations(Annotations* anno) { _annotations = anno; }
940
941 AnnotationArray* class_annotations() const {
942 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
943 }
944 Array<AnnotationArray*>* fields_annotations() const {
945 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
946 }
947 AnnotationArray* class_type_annotations() const {
948 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
949 }
950 Array<AnnotationArray*>* fields_type_annotations() const {
951 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
952 }
953 // allocation
954 instanceOop allocate_instance(TRAPS);
955
956 // additional member function to return a handle
957 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
958
959 objArrayOop allocate_objArray(int n, int length, TRAPS);
960 // Helper function
961 static instanceOop register_finalizer(instanceOop i, TRAPS);
962
963 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
964 // if not, throw either an Error or an Exception.
965 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
966
967 // initialization
968 void call_class_initializer(TRAPS);
969 void set_initialization_state_and_notify(ClassState state, TRAPS);
970
971 // OopMapCache support
972 OopMapCache* oop_map_cache() { return _oop_map_cache; }
973 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
974 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
975
976 // JNI identifier support (for static fields - for jni performance)
977 JNIid* jni_ids() { return _jni_ids; }
978 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
979 JNIid* jni_id_for(int offset);
980
981 // maintenance of deoptimization dependencies
982 inline DependencyContext dependencies();
983 int mark_dependent_nmethods(KlassDepChange& changes);
984 void add_dependent_nmethod(nmethod* nm);
985 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
986
987 // On-stack replacement support
988 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
989 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
990 void add_osr_nmethod(nmethod* n);
991 bool remove_osr_nmethod(nmethod* n);
992 int mark_osr_nmethods(const Method* m);
993 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
994
995 #if INCLUDE_JVMTI
996 // Breakpoint support (see methods on Method* for details)
997 BreakpointInfo* breakpoints() const { return _breakpoints; };
998 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
999 #endif
1000
1001 // support for stub routines
1002 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1003 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
1004 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1005
1006 // subclass/subinterface checks
1007 bool implements_interface(Klass* k) const;
1008 bool is_same_or_direct_interface(Klass* k) const;
1009
1010 #ifdef ASSERT
1011 // check whether this class or one of its superclasses was redefined
1012 bool has_redefined_this_or_super() const;
1013 #endif
1014
1015 // Access to the implementor of an interface.
1016 Klass* implementor() const
1017 {
1018 Klass** k = adr_implementor();
1019 if (k == NULL) {
1020 return NULL;
1021 } else {
1022 return *k;
1023 }
1024 }
1025
1026 void set_implementor(Klass* k) {
1027 assert(is_interface(), "not interface");
1028 Klass** addr = adr_implementor();
1029 assert(addr != NULL, "null addr");
1030 if (addr != NULL) {
1031 *addr = k;
1032 }
1033 }
1034
1035 int nof_implementors() const {
1036 Klass* k = implementor();
1037 if (k == NULL) {
1038 return 0;
1039 } else if (k != this) {
1040 return 1;
1041 } else {
1042 return 2;
1043 }
1044 }
1045
1046 void add_implementor(Klass* k); // k is a new class that implements this interface
1047 void init_implementor(); // initialize
1048
1049 // link this class into the implementors list of every interface it implements
1050 void process_interfaces(Thread *thread);
1051
1052 // virtual operations from Klass
1053 bool is_leaf_class() const { return _subklass == NULL; }
1054 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1055 bool compute_is_subtype_of(Klass* k);
1056 bool can_be_primary_super_slow() const;
1057 int oop_size(oop obj) const { return size_helper(); }
1058 // slow because it's a virtual call and used for verifying the layout_helper.
1059 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1060 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1061
1062 // Iterators
1063 void do_local_static_fields(FieldClosure* cl);
1064 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1065 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1066
1067 void methods_do(void f(Method* method));
1068 void array_klasses_do(void f(Klass* k));
1069 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1070 bool super_types_do(SuperTypeClosure* blk);
1071
1072 static InstanceKlass* cast(Klass* k) {
1073 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1074 }
1075
1076 static const InstanceKlass* cast(const Klass* k) {
1077 assert(k != NULL, "k should not be null");
1078 assert(k->is_instance_klass(), "cast to InstanceKlass");
1079 return static_cast<const InstanceKlass*>(k);
1080 }
1081
1082 InstanceKlass* java_super() const {
1083 return (super() == NULL) ? NULL : cast(super());
1084 }
1085
1086 // Sizing (in words)
1087 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1088
1089 static int size(int vtable_length, int itable_length,
1090 int nonstatic_oop_map_size,
1091 bool is_interface, bool is_anonymous, bool has_stored_fingerprint,
1092 int java_fields, bool is_value_type) {
1093 return align_metadata_size(header_size() +
1094 vtable_length +
1095 itable_length +
1096 nonstatic_oop_map_size +
1097 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1098 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1099 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1100 (java_fields * (int)sizeof(Klass*)/wordSize) +
1101 (is_value_type ? (int)sizeof(Klass*) : 0));
1102 }
1103 int size() const { return size(vtable_length(),
1104 itable_length(),
1105 nonstatic_oop_map_size(),
1106 is_interface(),
1107 is_anonymous(),
1108 has_stored_fingerprint(),
1109 has_value_fields() ? java_fields_count() : 0,
1110 is_value());
1111 }
1112 #if INCLUDE_SERVICES
1113 virtual void collect_statistics(KlassSizeStats *sz) const;
1114 #endif
1115
1116 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1117 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1118
1119 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1120
1121 address static_field_addr(int offset);
1122
1123 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1124
1125 OopMapBlock* start_of_nonstatic_oop_maps() const {
1126 return (OopMapBlock*)(start_of_itable() + itable_length());
1127 }
1128
1129 Klass** end_of_nonstatic_oop_maps() const {
1130 return (Klass**)(start_of_nonstatic_oop_maps() +
1131 nonstatic_oop_map_count());
1132 }
1133
1134 Klass** adr_implementor() const {
1135 if (is_interface()) {
1136 return (Klass**)end_of_nonstatic_oop_maps();
1137 } else {
1138 return NULL;
1139 }
1140 };
1141
1142 InstanceKlass** adr_host_klass() const {
1143 if (is_anonymous()) {
1144 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1145 if (adr_impl != NULL) {
1146 return adr_impl + 1;
1147 } else {
1148 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1149 }
1150 } else {
1151 return NULL;
1152 }
1153 }
1154
1155 address adr_fingerprint() const {
1156 if (has_stored_fingerprint()) {
1157 InstanceKlass** adr_host = adr_host_klass();
1158 if (adr_host != NULL) {
1159 return (address)(adr_host + 1);
1160 }
1161
1162 Klass** adr_impl = adr_implementor();
1163 if (adr_impl != NULL) {
1164 return (address)(adr_impl + 1);
1165 }
1166
1167 return (address)end_of_nonstatic_oop_maps();
1168 } else {
1169 return NULL;
1170 }
1171 }
1172
1173 address adr_value_fields_klasses() const {
1174 if (has_value_fields()) {
1175 address adr_fing = adr_fingerprint();
1176 if (adr_fing != NULL) {
1177 return adr_fingerprint() + sizeof(u8);
1178 }
1179
1180 InstanceKlass** adr_host = adr_host_klass();
1181 if (adr_host != NULL) {
1182 return (address)(adr_host + 1);
1183 }
1184
1185 Klass** adr_impl = adr_implementor();
1186 if (adr_impl != NULL) {
1187 return (address)(adr_impl + 1);
1188 }
1189
1190 return (address)end_of_nonstatic_oop_maps();
1191 } else {
1192 return NULL;
1193 }
1194 }
1195
1196 address adr_vcc_klass() const {
1197 if (has_vcc_klass()) {
1198 address adr_jf = adr_value_fields_klasses();
1199 if (adr_jf != NULL) {
1200 return adr_jf + this->java_fields_count() * sizeof(Klass*);
1201 }
1202
1203 address adr_fing = adr_fingerprint();
1204 if (adr_fing != NULL) {
1205 return adr_fingerprint() + sizeof(u8);
1206 }
1207
1208 InstanceKlass** adr_host = adr_host_klass();
1209 if (adr_host != NULL) {
1210 return (address)(adr_host + 1);
1211 }
1212
1213 Klass** adr_impl = adr_implementor();
1214 if (adr_impl != NULL) {
1215 return (address)(adr_impl + 1);
1216 }
1217
1218 return (address)end_of_nonstatic_oop_maps();
1219 } else {
1220 return NULL;
1221 }
1222 }
1223
1224 Klass* get_value_field_klass(int idx) {
1225 assert(has_value_fields(), "Sanity checking");
1226 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1227 assert(k != NULL, "Should always be set before being read");
1228 assert(k->is_value(), "Must be a value type");
1229 return k;
1230 }
1231
1232 void set_value_field_klass(int idx, Klass* k) {
1233 assert(has_value_fields(), "Sanity checking");
1234 assert(k != NULL, "Should not be set to NULL");
1235 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1236 ((Klass**)adr_value_fields_klasses())[idx] = k;
1237 }
1238
1239 Klass* get_vcc_klass() const {
1240 if (has_vcc_klass()) {
1241 Klass* k = *(Klass**)adr_vcc_klass();
1242 assert(k == NULL || !k->is_value(), "Must not be a value type");
1243 return k;
1244 }
1245 return NULL;
1246 }
1247
1248 void set_vcc_klass(Klass* k) {
1249 assert(has_vcc_klass(), "Sanity checking");
1250 assert(k == NULL || !k->is_value(), "Must not be a value type");
1251 *(Klass**)adr_vcc_klass()= k;
1252 }
1253
1254 // Use this to return the size of an instance in heap words:
1255 virtual int size_helper() const {
1256 return layout_helper_to_size_helper(layout_helper());
1257 }
1258
1259 // This bit is initialized in classFileParser.cpp.
1260 // It is false under any of the following conditions:
1261 // - the class is abstract (including any interface)
1262 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1263 // - the class size is larger than FastAllocateSizeLimit
1264 // - the class is java/lang/Class, which cannot be allocated directly
1265 bool can_be_fastpath_allocated() const {
1266 return !layout_helper_needs_slow_path(layout_helper());
1267 }
1268
1269 // Java itable
1270 klassItable itable() const; // return klassItable wrapper
1271 Method* method_at_itable(Klass* holder, int index, TRAPS);
1272
1273 #if INCLUDE_JVMTI
1274 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1275 #endif // INCLUDE_JVMTI
1276
1277 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1278 void clean_implementors_list(BoolObjectClosure* is_alive);
1279 void clean_method_data(BoolObjectClosure* is_alive);
1280
1281 // Explicit metaspace deallocation of fields
1282 // For RedefineClasses and class file parsing errors, we need to deallocate
1283 // instanceKlasses and the metadata they point to.
1284 void deallocate_contents(ClassLoaderData* loader_data);
1285 static void deallocate_methods(ClassLoaderData* loader_data,
1286 Array<Method*>* methods);
1287 void static deallocate_interfaces(ClassLoaderData* loader_data,
1288 const Klass* super_klass,
1289 Array<Klass*>* local_interfaces,
1290 Array<Klass*>* transitive_interfaces);
1291
1292 // The constant pool is on stack if any of the methods are executing or
1293 // referenced by handles.
1294 bool on_stack() const { return _constants->on_stack(); }
1295
1296 // callbacks for actions during class unloading
1297 static void notify_unload_class(InstanceKlass* ik);
1298 static void release_C_heap_structures(InstanceKlass* ik);
1299
1300 // Naming
1301 const char* signature_name() const;
1302 static Symbol* package_from_name(const Symbol* name, TRAPS);
1303
1304 // GC specific object visitors
1305 //
1306 #if INCLUDE_ALL_GCS
1307 // Parallel Scavenge
1308 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1309 // Parallel Compact
1310 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1311 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1312 #endif
1313
1314 // Oop fields (and metadata) iterators
1315 // [nv = true] Use non-virtual calls to do_oop_nv.
1316 // [nv = false] Use virtual calls to do_oop.
1317 //
1318 // The InstanceKlass iterators also visits the Object's klass.
1319
1320 // Forward iteration
1321 public:
1322 // Iterate over all oop fields in the oop maps.
1323 template <bool nv, class OopClosureType>
1324 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1325
1326 protected:
1327 // Iterate over all oop fields and metadata.
1328 template <bool nv, class OopClosureType>
1329 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1330
1331 private:
1332 // Iterate over all oop fields in the oop maps.
1333 // Specialized for [T = oop] or [T = narrowOop].
1334 template <bool nv, typename T, class OopClosureType>
1335 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1336
1337 // Iterate over all oop fields in one oop map.
1338 template <bool nv, typename T, class OopClosureType>
1339 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1340
1341
1342 // Reverse iteration
1343 #if INCLUDE_ALL_GCS
1344 public:
1345 // Iterate over all oop fields in the oop maps.
1346 template <bool nv, class OopClosureType>
1347 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1348
1349 protected:
1350 // Iterate over all oop fields and metadata.
1351 template <bool nv, class OopClosureType>
1352 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1353
1354 private:
1355 // Iterate over all oop fields in the oop maps.
1356 // Specialized for [T = oop] or [T = narrowOop].
1357 template <bool nv, typename T, class OopClosureType>
1358 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1359
1360 // Iterate over all oop fields in one oop map.
1361 template <bool nv, typename T, class OopClosureType>
1362 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1363 #endif
1364
1365
1366 // Bounded range iteration
1367 public:
1368 // Iterate over all oop fields in the oop maps.
1369 template <bool nv, class OopClosureType>
1370 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1371
1372 protected:
1373 // Iterate over all oop fields and metadata.
1374 template <bool nv, class OopClosureType>
1375 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1376
1377 private:
1378 // Iterate over all oop fields in the oop maps.
1379 // Specialized for [T = oop] or [T = narrowOop].
1380 template <bool nv, typename T, class OopClosureType>
1381 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1382
1383 // Iterate over all oop fields in one oop map.
1384 template <bool nv, typename T, class OopClosureType>
1385 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1386
1387
1388 public:
1389
1390 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1391 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1392
1393 #if INCLUDE_ALL_GCS
1394 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1395 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1396 #endif // INCLUDE_ALL_GCS
1397
1398 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1399
1400 public:
1401 void set_in_error_state() {
1402 assert(DumpSharedSpaces, "only call this when dumping archive");
1403 _init_state = initialization_error;
1404 }
1405 bool check_sharing_error_state();
1406
1407 private:
1408 // initialization state
1409 #ifdef ASSERT
1410 void set_init_state(ClassState state);
1411 #else
1412 void set_init_state(ClassState state) { _init_state = (u1)state; }
1413 #endif
1414 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1415 void set_init_thread(Thread *thread) { _init_thread = thread; }
1416
1417 // The RedefineClasses() API can cause new method idnums to be needed
1418 // which will cause the caches to grow. Safety requires different
1419 // cache management logic if the caches can grow instead of just
1420 // going from NULL to non-NULL.
1421 bool idnum_can_increment() const { return has_been_redefined(); }
1422 inline jmethodID* methods_jmethod_ids_acquire() const;
1423 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1424
1425 // Lock during initialization
1426 public:
1427 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1428 // Must be one per class and it has to be a VM internal object so java code
1429 // cannot lock it (like the mirror).
1430 // It has to be an object not a Mutex because it's held through java calls.
1431 oop init_lock() const;
1432 private:
1433 void fence_and_clear_init_lock();
1434
1435 bool link_class_impl (bool throw_verifyerror, TRAPS);
1436 bool verify_code (bool throw_verifyerror, TRAPS);
1437 void initialize_impl (TRAPS);
1438 void initialize_super_interfaces (TRAPS);
1439 void eager_initialize_impl ();
1440 /* jni_id_for_impl for jfieldID only */
1441 JNIid* jni_id_for_impl (int offset);
1442 protected:
1443 // Returns the array class for the n'th dimension
1444 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
1445
1446 // Returns the array class with this class as element type
1447 virtual Klass* array_klass_impl(bool or_null, TRAPS);
1448
1449 private:
1450
1451 // find a local method (returns NULL if not found)
1452 Method* find_method_impl(const Symbol* name,
1453 const Symbol* signature,
1454 OverpassLookupMode overpass_mode,
1455 StaticLookupMode static_mode,
1456 PrivateLookupMode private_mode) const;
1457
1458 static Method* find_method_impl(const Array<Method*>* methods,
1459 const Symbol* name,
1460 const Symbol* signature,
1461 OverpassLookupMode overpass_mode,
1462 StaticLookupMode static_mode,
1463 PrivateLookupMode private_mode);
1464
1465 // Free CHeap allocated fields.
1466 void release_C_heap_structures();
1467
1468 #if INCLUDE_JVMTI
1469 // RedefineClasses support
1470 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1471 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1472 #endif
1473 public:
1474 // CDS support - remove and restore oops from metadata. Oops are not shared.
1475 virtual void remove_unshareable_info();
1476 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1477
1478 // jvm support
1479 jint compute_modifier_flags(TRAPS) const;
1480
1481 // JSR-292 support
1482 MemberNameTable* member_names() { return _member_names; }
1483 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1484 oop add_member_name(Handle member_name, bool intern);
1485
1486 //Valhalla prototype DeriveValueType
1487 void create_derive_value_type(Handle class_loader, Handle protection_domain, TRAPS);
1488
1489 public:
1490 // JVMTI support
1491 jint jvmti_class_status() const;
1492
1493 public:
1494 // Printing
1495 #ifndef PRODUCT
1496 void print_on(outputStream* st) const;
1497 #endif
1498 void print_value_on(outputStream* st) const;
1499
1500 void oop_print_value_on(oop obj, outputStream* st);
1501
1502 #ifndef PRODUCT
1503 void oop_print_on (oop obj, outputStream* st);
1504
1505 void print_dependent_nmethods(bool verbose = false);
1506 bool is_dependent_nmethod(nmethod* nm);
1507 #endif
1508
1509 const char* internal_name() const;
1510
1511 // Verification
1512 void verify_on(outputStream* st);
1513
1514 void oop_verify_on(oop obj, outputStream* st);
1515
1516 // Logging
1517 void print_class_load_logging(ClassLoaderData* loader_data,
1518 const char* module_name,
1519 const ClassFileStream* cfs) const;
1520 };
1521
1522 // for adding methods
1523 // UNSET_IDNUM return means no more ids available
1524 inline u2 InstanceKlass::next_method_idnum() {
1525 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1526 return ConstMethod::UNSET_IDNUM; // no more ids available
1527 } else {
1528 return _idnum_allocated_count++;
1529 }
1530 }
1531
1532
1533 /* JNIid class for jfieldIDs only */
1534 class JNIid: public CHeapObj<mtClass> {
1535 friend class VMStructs;
1536 private:
1537 Klass* _holder;
1538 JNIid* _next;
1539 int _offset;
1540 #ifdef ASSERT
1541 bool _is_static_field_id;
1542 #endif
1543
1544 public:
1545 // Accessors
1546 Klass* holder() const { return _holder; }
1547 int offset() const { return _offset; }
1548 JNIid* next() { return _next; }
1549 // Constructor
1550 JNIid(Klass* holder, int offset, JNIid* next);
1551 // Identifier lookup
1552 JNIid* find(int offset);
1553
1554 bool find_local_field(fieldDescriptor* fd) {
1555 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1556 }
1557
1558 static void deallocate(JNIid* id);
1559 // Debugging
1560 #ifdef ASSERT
1561 bool is_static_field_id() const { return _is_static_field_id; }
1562 void set_is_static_field_id() { _is_static_field_id = true; }
1563 #endif
1564 void verify(Klass* holder);
1565 };
1566
1567 // An iterator that's used to access the inner classes indices in the
1568 // InstanceKlass::_inner_classes array.
1569 class InnerClassesIterator : public StackObj {
1570 private:
1571 Array<jushort>* _inner_classes;
1572 int _length;
1573 int _idx;
1574 public:
1575
1576 InnerClassesIterator(const InstanceKlass* k) {
1577 _inner_classes = k->inner_classes();
1578 if (k->inner_classes() != NULL) {
1579 _length = _inner_classes->length();
1580 // The inner class array's length should be the multiple of
1581 // inner_class_next_offset if it only contains the InnerClasses
1582 // attribute data, or it should be
1583 // n*inner_class_next_offset+enclosing_method_attribute_size
1584 // if it also contains the EnclosingMethod data.
1585 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1586 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1587 "just checking");
1588 // Remove the enclosing_method portion if exists.
1589 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1590 _length -= InstanceKlass::enclosing_method_attribute_size;
1591 }
1592 } else {
1593 _length = 0;
1594 }
1595 _idx = 0;
1596 }
1597
1598 int length() const {
1599 return _length;
1600 }
1601
1602 void next() {
1603 _idx += InstanceKlass::inner_class_next_offset;
1604 }
1605
1606 bool done() const {
1607 return (_idx >= _length);
1608 }
1609
1610 u2 inner_class_info_index() const {
1611 return _inner_classes->at(
1612 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1613 }
1614
1615 void set_inner_class_info_index(u2 index) {
1616 _inner_classes->at_put(
1617 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1618 }
1619
1620 u2 outer_class_info_index() const {
1621 return _inner_classes->at(
1622 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1623 }
1624
1625 void set_outer_class_info_index(u2 index) {
1626 _inner_classes->at_put(
1627 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1628 }
1629
1630 u2 inner_name_index() const {
1631 return _inner_classes->at(
1632 _idx + InstanceKlass::inner_class_inner_name_offset);
1633 }
1634
1635 void set_inner_name_index(u2 index) {
1636 _inner_classes->at_put(
1637 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1638 }
1639
1640 u2 inner_access_flags() const {
1641 return _inner_classes->at(
1642 _idx + InstanceKlass::inner_class_access_flags_offset);
1643 }
1644 };
1645
1646 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP