1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/packageEntry.hpp"
32 #include "gc/shared/specialized_oop_closures.hpp"
33 #include "memory/referenceType.hpp"
34 #include "oops/annotations.hpp"
35 #include "oops/constMethod.hpp"
36 #include "oops/fieldInfo.hpp"
37 #include "oops/instanceOop.hpp"
38 #include "oops/klassVtable.hpp"
39 #include "runtime/handles.hpp"
40 #include "runtime/os.hpp"
41 #include "trace/traceMacros.hpp"
42 #include "utilities/accessFlags.hpp"
43 #include "utilities/align.hpp"
44 #include "utilities/macros.hpp"
45
46 // An InstanceKlass is the VM level representation of a Java class.
47 // It contains all information needed for at class at execution runtime.
48
49 // InstanceKlass embedded field layout (after declared fields):
50 // [EMBEDDED Java vtable ] size in words = vtable_len
51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
52 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
53 // indicating where oops are located in instances of this klass.
54 // [EMBEDDED implementor of the interface] only exist for interface
55 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
57
58
59 // forward declaration for class -- see below for definition
60 #if INCLUDE_JVMTI
61 class BreakpointInfo;
62 #endif
63 class ClassFileParser;
64 class KlassDepChange;
65 class DependencyContext;
66 class fieldDescriptor;
67 class jniIdMapBase;
68 class JNIid;
69 class JvmtiCachedClassFieldMap;
70 class SuperTypeClosure;
71 class BufferedValueTypeBlob;
72
73 // This is used in iterators below.
74 class FieldClosure: public StackObj {
75 public:
76 virtual void do_field(fieldDescriptor* fd) = 0;
77 };
78
79 #ifndef PRODUCT
80 // Print fields.
81 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
82 class FieldPrinter: public FieldClosure {
83 oop _obj;
84 outputStream* _st;
85 public:
86 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
87 void do_field(fieldDescriptor* fd);
88 };
89 #endif // !PRODUCT
90
91 // ValueObjs embedded in klass. Describes where oops are located in instances of
92 // this klass.
93 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
94 public:
95 // Byte offset of the first oop mapped by this block.
96 int offset() const { return _offset; }
97 void set_offset(int offset) { _offset = offset; }
98
99 // Number of oops in this block.
100 uint count() const { return _count; }
101 void set_count(uint count) { _count = count; }
102
103 void increment_count(int diff) { _count += diff; }
104
105 int offset_span() const { return _count * heapOopSize; }
106
107 int end_offset() const {
108 return offset() + offset_span();
109 }
110
111 bool is_contiguous(int another_offset) const {
112 return another_offset == end_offset();
113 }
114
115 // sizeof(OopMapBlock) in words.
116 static const int size_in_words() {
117 return align_up((int)sizeof(OopMapBlock), wordSize) >>
118 LogBytesPerWord;
119 }
120
121 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
122 return a->offset() - b->offset();
123 }
124
125 private:
126 int _offset;
127 uint _count;
128 };
129
130 struct JvmtiCachedClassFileData;
131
132 class InstanceKlass: public Klass {
133 friend class VMStructs;
134 friend class JVMCIVMStructs;
135 friend class ClassFileParser;
136 friend class CompileReplay;
137
138 protected:
139 InstanceKlass(const ClassFileParser& parser, unsigned kind);
140
141 public:
142 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
143
144 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
145 // of the class loading & initialization procedure, and the use of the states.
146 enum ClassState {
147 allocated, // allocated (but not yet linked)
148 loaded, // loaded and inserted in class hierarchy (but not linked yet)
149 linked, // successfully linked/verified (but not initialized yet)
150 being_initialized, // currently running class initializer
151 fully_initialized, // initialized (successfull final state)
152 initialization_error // error happened during initialization
153 };
154
155 static int number_of_instance_classes() { return _total_instanceKlass_count; }
156
157 private:
158 static volatile int _total_instanceKlass_count;
159 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
160
161 protected:
162 // If you add a new field that points to any metaspace object, you
163 // must add this field to InstanceKlass::metaspace_pointers_do().
164
165 // Annotations for this class
166 Annotations* _annotations;
167 // Package this class is defined in
168 PackageEntry* _package_entry;
169 // Array classes holding elements of this class.
170 Klass* volatile _array_klasses;
171 // Constant pool for this class.
172 ConstantPool* _constants;
173 // The InnerClasses attribute and EnclosingMethod attribute. The
174 // _inner_classes is an array of shorts. If the class has InnerClasses
175 // attribute, then the _inner_classes array begins with 4-tuples of shorts
176 // [inner_class_info_index, outer_class_info_index,
177 // inner_name_index, inner_class_access_flags] for the InnerClasses
178 // attribute. If the EnclosingMethod attribute exists, it occupies the
179 // last two shorts [class_index, method_index] of the array. If only
180 // the InnerClasses attribute exists, the _inner_classes array length is
181 // number_of_inner_classes * 4. If the class has both InnerClasses
182 // and EnclosingMethod attributes the _inner_classes array length is
183 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
184 Array<jushort>* _inner_classes;
185
186 // the source debug extension for this klass, NULL if not specified.
187 // Specified as UTF-8 string without terminating zero byte in the classfile,
188 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
189 const char* _source_debug_extension;
190 // Array name derived from this class which needs unreferencing
191 // if this class is unloaded.
192 Symbol* _array_name;
193
194 // Number of heapOopSize words used by non-static fields in this klass
195 // (including inherited fields but after header_size()).
196 int _nonstatic_field_size;
197 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
198 // Constant pool index to the utf8 entry of the Generic signature,
199 // or 0 if none.
200 u2 _generic_signature_index;
201 // Constant pool index to the utf8 entry for the name of source file
202 // containing this klass, 0 if not specified.
203 u2 _source_file_name_index;
204 u2 _static_oop_field_count;// number of static oop fields in this klass
205 u2 _java_fields_count; // The number of declared Java fields
206 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
207
208 int _itable_len; // length of Java itable (in words)
209 // _is_marked_dependent can be set concurrently, thus cannot be part of the
210 // _misc_flags.
211 bool _is_marked_dependent; // used for marking during flushing and deoptimization
212
213 public:
214 enum {
215 _extra_is_being_redefined = 1 << 0, // used for locking redefinition
216 _extra_has_value_fields = 1 << 1, // has value fields and related embedded section is not empty
217 _extra_is_bufferable = 1 << 2, // value can be buffered out side of the Java heap
218 _extra_has_vcc_klass = 1 << 3, // has a pointer to its Value Capable Class (MVT)
219 _extra_has_resolved_methods = 1 << 4 // resolved methods table entries added for this class
220 };
221
222 protected:
223 u1 _extra_flags;
224
225 // The low three bits of _misc_flags contains the kind field.
226 // This can be used to quickly discriminate among the five kinds of
227 // InstanceKlass.
228
229 static const unsigned _misc_kind_field_size = 3;
230 static const unsigned _misc_kind_field_pos = 0;
231 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
232
233 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
234 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
235 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
236 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
237 static const unsigned _misc_kind_value_type = 4; // ValueKlass
238
239 // Start after _misc_kind field.
240 enum {
241 _misc_rewritten = 1 << 3, // methods rewritten.
242 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops
243 _misc_should_verify_class = 1 << 5, // allow caching of preverification
244 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field
245 _misc_is_contended = 1 << 7, // marked with contended annotation
246 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods
247 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods
248 _misc_has_been_redefined = 1 << 10, // class has been redefined
249 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its
250 // code source was found to be matching the value recorded by AOT.
251 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class
252 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader
253 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader
254 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader
255 // u2 _misc_flags full (see _extra_flags)
256 };
257 u2 loader_type_bits() {
258 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
259 }
260 u2 _misc_flags;
261 u2 _minor_version; // minor version number of class file
262 u2 _major_version; // major version number of class file
263 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
264 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
265 JNIid* _jni_ids; // First JNI identifier for static fields in this class
266 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
267 intptr_t _dep_context; // packed DependencyContext structure
268 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
269 #if INCLUDE_JVMTI
270 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
271 // Linked instanceKlasses of previous versions
272 InstanceKlass* _previous_versions;
273 // JVMTI fields can be moved to their own structure - see 6315920
274 // JVMTI: cached class file, before retransformable agent modified it in CFLH
275 JvmtiCachedClassFileData* _cached_class_file;
276 #endif
277
278 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
279
280 // Class states are defined as ClassState (see above).
281 // Place the _init_state here to utilize the unused 2-byte after
282 // _idnum_allocated_count.
283 u1 _init_state; // state of class
284 u1 _reference_type; // reference type
285
286 #if INCLUDE_JVMTI
287 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
288 #endif
289
290 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
291
292 // Method array.
293 Array<Method*>* _methods;
294 // Default Method Array, concrete methods inherited from interfaces
295 Array<Method*>* _default_methods;
296 // Interface (Klass*s) this class declares locally to implement.
297 Array<Klass*>* _local_interfaces;
298 // Interface (Klass*s) this class implements transitively.
299 Array<Klass*>* _transitive_interfaces;
300 // Int array containing the original order of method in the class file (for JVMTI).
301 Array<int>* _method_ordering;
302 // Int array containing the vtable_indices for default_methods
303 // offset matches _default_methods offset
304 Array<int>* _default_vtable_indices;
305
306 // Instance and static variable information, starts with 6-tuples of shorts
307 // [access, name index, sig index, initval index, low_offset, high_offset]
308 // for all fields, followed by the generic signature data at the end of
309 // the array. Only fields with generic signature attributes have the generic
310 // signature data set in the array. The fields array looks like following:
311 //
312 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
313 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
314 // ...
315 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
316 // [generic signature index]
317 // [generic signature index]
318 // ...
319 Array<u2>* _fields;
320
321 // embedded Java vtable follows here
322 // embedded Java itables follows here
323 // embedded static fields follows here
324 // embedded nonstatic oop-map blocks follows here
325 // embedded implementor of this interface follows here
326 // The embedded implementor only exists if the current klass is an
327 // iterface. The possible values of the implementor fall into following
328 // three cases:
329 // NULL: no implementor.
330 // A Klass* that's not itself: one implementor.
331 // Itself: more than one implementors.
332 // embedded host klass follows here
333 // The embedded host klass only exists in an anonymous class for
334 // dynamic language support (JSR 292 enabled). The host class grants
335 // its access privileges to this class also. The host class is either
336 // named, or a previously loaded anonymous class. A non-anonymous class
337 // or an anonymous class loaded through normal classloading does not
338 // have this embedded field.
339 //
340
341 friend class SystemDictionary;
342
343 public:
344 u2 loader_type() {
345 return _misc_flags & loader_type_bits();
346 }
347
348 bool is_shared_boot_class() const {
349 return (_misc_flags & _misc_is_shared_boot_class) != 0;
350 }
351 bool is_shared_platform_class() const {
352 return (_misc_flags & _misc_is_shared_platform_class) != 0;
353 }
354 bool is_shared_app_class() const {
355 return (_misc_flags & _misc_is_shared_app_class) != 0;
356 }
357
358 void set_class_loader_type(s2 loader_type) {
359 assert(( _misc_flags & loader_type_bits()) == 0,
360 "Should only be called once for each class.");
361 switch (loader_type) {
362 case ClassLoader::BOOT_LOADER:
363 _misc_flags |= _misc_is_shared_boot_class;
364 break;
365 case ClassLoader::PLATFORM_LOADER:
366 _misc_flags |= _misc_is_shared_platform_class;
367 break;
368 case ClassLoader::APP_LOADER:
369 _misc_flags |= _misc_is_shared_app_class;
370 break;
371 default:
372 ShouldNotReachHere();
373 break;
374 }
375 }
376
377 bool has_nonstatic_fields() const {
378 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
379 }
380 void set_has_nonstatic_fields(bool b) {
381 if (b) {
382 _misc_flags |= _misc_has_nonstatic_fields;
383 } else {
384 _misc_flags &= ~_misc_has_nonstatic_fields;
385 }
386 }
387
388 bool has_value_fields() const {
389 return (_extra_flags & _extra_has_value_fields) != 0;
390 }
391 void set_has_value_fields() {
392 _extra_flags |= _extra_has_value_fields;
393 }
394
395 bool has_vcc_klass() const {
396 return (_extra_flags & _extra_has_vcc_klass) != 0;
397 }
398 void set_has_vcc_klass() {
399 _extra_flags |= _extra_has_vcc_klass;
400 }
401
402
403 // field sizes
404 int nonstatic_field_size() const { return _nonstatic_field_size; }
405 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
406
407 int static_field_size() const { return _static_field_size; }
408 void set_static_field_size(int size) { _static_field_size = size; }
409
410 int static_oop_field_count() const { return (int)_static_oop_field_count; }
411 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
412
413 // Java itable
414 int itable_length() const { return _itable_len; }
415 void set_itable_length(int len) { _itable_len = len; }
416
417 // array klasses
418 Klass* array_klasses() const { return _array_klasses; }
419 inline Klass* array_klasses_acquire() const; // load with acquire semantics
420 void set_array_klasses(Klass* k) { _array_klasses = k; }
421 inline void release_set_array_klasses(Klass* k); // store with release semantics
422
423 // methods
424 Array<Method*>* methods() const { return _methods; }
425 void set_methods(Array<Method*>* a) { _methods = a; }
426 Method* method_with_idnum(int idnum);
427 Method* method_with_orig_idnum(int idnum);
428 Method* method_with_orig_idnum(int idnum, int version);
429
430 // method ordering
431 Array<int>* method_ordering() const { return _method_ordering; }
432 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
433 void copy_method_ordering(const intArray* m, TRAPS);
434
435 // default_methods
436 Array<Method*>* default_methods() const { return _default_methods; }
437 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
438
439 // default method vtable_indices
440 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
441 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
442 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
443
444 // interfaces
445 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
446 void set_local_interfaces(Array<Klass*>* a) {
447 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
448 _local_interfaces = a; }
449
450 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
451 void set_transitive_interfaces(Array<Klass*>* a) {
452 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
453 _transitive_interfaces = a;
454 }
455
456 private:
457 friend class fieldDescriptor;
458 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
459
460 public:
461 int field_offset (int index) const { return field(index)->offset(); }
462 int field_access_flags(int index) const { return field(index)->access_flags(); }
463 Symbol* field_name (int index) const { return field(index)->name(constants()); }
464 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
465
466 // Number of Java declared fields
467 int java_fields_count() const { return (int)_java_fields_count; }
468
469 Array<u2>* fields() const { return _fields; }
470 void set_fields(Array<u2>* f, u2 java_fields_count) {
471 guarantee(_fields == NULL || f == NULL, "Just checking");
472 _fields = f;
473 _java_fields_count = java_fields_count;
474 }
475
476 // inner classes
477 Array<u2>* inner_classes() const { return _inner_classes; }
478 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
479
480 enum InnerClassAttributeOffset {
481 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
482 inner_class_inner_class_info_offset = 0,
483 inner_class_outer_class_info_offset = 1,
484 inner_class_inner_name_offset = 2,
485 inner_class_access_flags_offset = 3,
486 inner_class_next_offset = 4
487 };
488
489 enum EnclosingMethodAttributeOffset {
490 enclosing_method_class_index_offset = 0,
491 enclosing_method_method_index_offset = 1,
492 enclosing_method_attribute_size = 2
493 };
494
495 // method override check
496 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
497
498 // package
499 PackageEntry* package() const { return _package_entry; }
500 ModuleEntry* module() const;
501 bool in_unnamed_package() const { return (_package_entry == NULL); }
502 void set_package(PackageEntry* p) { _package_entry = p; }
503 void set_package(ClassLoaderData* loader_data, TRAPS);
504 bool is_same_class_package(const Klass* class2) const;
505 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
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 bool has_resolved_methods() const {
804 return (_extra_flags & _extra_has_resolved_methods) != 0;
805 }
806
807 void set_has_resolved_methods() {
808 _extra_flags |= _extra_has_resolved_methods;
809 }
810 private:
811
812 void set_kind(unsigned kind) {
813 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
814 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
815 unsigned flags = _misc_flags & ~fmask;
816 _misc_flags = (flags | (kind << _misc_kind_field_pos));
817 }
818
819 bool is_kind(unsigned desired) const {
820 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
821 return kind == desired;
822 }
823
824 public:
825
826 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
827 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
828 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
829 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
830 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
831 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
832
833 #if INCLUDE_JVMTI
834
835 void init_previous_versions() {
836 _previous_versions = NULL;
837 }
838
839 private:
840 static bool _has_previous_versions;
841 public:
842 static void purge_previous_versions(InstanceKlass* ik) {
843 if (ik->has_been_redefined()) {
844 ik->purge_previous_version_list();
845 }
846 }
847
848 static bool has_previous_versions_and_reset();
849
850 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
851 void set_cached_class_file(JvmtiCachedClassFileData *data) {
852 _cached_class_file = data;
853 }
854 JvmtiCachedClassFileData * get_cached_class_file();
855 jint get_cached_class_file_len();
856 unsigned char * get_cached_class_file_bytes();
857
858 // JVMTI: Support for caching of field indices, types, and offsets
859 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
860 _jvmti_cached_class_field_map = descriptor;
861 }
862 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
863 return _jvmti_cached_class_field_map;
864 }
865
866 #if INCLUDE_CDS
867 void set_archived_class_data(JvmtiCachedClassFileData* data) {
868 _cached_class_file = data;
869 }
870
871 JvmtiCachedClassFileData * get_archived_class_data();
872 #endif // INCLUDE_CDS
873 #else // INCLUDE_JVMTI
874
875 static void purge_previous_versions(InstanceKlass* ik) { return; };
876 static bool has_previous_versions_and_reset() { return false; }
877
878 void set_cached_class_file(JvmtiCachedClassFileData *data) {
879 assert(data == NULL, "unexpected call with JVMTI disabled");
880 }
881 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
882
883 #endif // INCLUDE_JVMTI
884
885 bool has_nonstatic_concrete_methods() const {
886 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
887 }
888 void set_has_nonstatic_concrete_methods(bool b) {
889 if (b) {
890 _misc_flags |= _misc_has_nonstatic_concrete_methods;
891 } else {
892 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
893 }
894 }
895
896 bool declares_nonstatic_concrete_methods() const {
897 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
898 }
899 void set_declares_nonstatic_concrete_methods(bool b) {
900 if (b) {
901 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
902 } else {
903 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
904 }
905 }
906
907 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
908 inline u2 next_method_idnum();
909 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
910
911 // generics support
912 Symbol* generic_signature() const {
913 return (_generic_signature_index == 0) ?
914 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
915 }
916 u2 generic_signature_index() const {
917 return _generic_signature_index;
918 }
919 void set_generic_signature_index(u2 sig_index) {
920 _generic_signature_index = sig_index;
921 }
922
923 u2 enclosing_method_data(int offset) const;
924 u2 enclosing_method_class_index() const {
925 return enclosing_method_data(enclosing_method_class_index_offset);
926 }
927 u2 enclosing_method_method_index() {
928 return enclosing_method_data(enclosing_method_method_index_offset);
929 }
930 void set_enclosing_method_indices(u2 class_index,
931 u2 method_index);
932
933 // jmethodID support
934 jmethodID get_jmethod_id(const methodHandle& method_h);
935 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
936 jmethodID new_id, jmethodID* new_jmeths,
937 jmethodID* to_dealloc_id_p,
938 jmethodID** to_dealloc_jmeths_p);
939 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
940 size_t *length_p, jmethodID* id_p);
941 void ensure_space_for_methodids(int start_offset = 0);
942 jmethodID jmethod_id_or_null(Method* method);
943
944 // annotations support
945 Annotations* annotations() const { return _annotations; }
946 void set_annotations(Annotations* anno) { _annotations = anno; }
947
948 AnnotationArray* class_annotations() const {
949 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
950 }
951 Array<AnnotationArray*>* fields_annotations() const {
952 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
953 }
954 AnnotationArray* class_type_annotations() const {
955 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
956 }
957 Array<AnnotationArray*>* fields_type_annotations() const {
958 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
959 }
960 // allocation
961 instanceOop allocate_instance(TRAPS);
962
963 // additional member function to return a handle
964 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
965
966 objArrayOop allocate_objArray(int n, int length, TRAPS);
967 // Helper function
968 static instanceOop register_finalizer(instanceOop i, TRAPS);
969
970 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
971 // if not, throw either an Error or an Exception.
972 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
973
974 // initialization
975 void call_class_initializer(TRAPS);
976 void set_initialization_state_and_notify(ClassState state, TRAPS);
977
978 // OopMapCache support
979 OopMapCache* oop_map_cache() { return _oop_map_cache; }
980 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
981 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
982
983 // JNI identifier support (for static fields - for jni performance)
984 JNIid* jni_ids() { return _jni_ids; }
985 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
986 JNIid* jni_id_for(int offset);
987
988 // maintenance of deoptimization dependencies
989 inline DependencyContext dependencies();
990 int mark_dependent_nmethods(KlassDepChange& changes);
991 void add_dependent_nmethod(nmethod* nm);
992 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
993
994 // On-stack replacement support
995 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
996 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
997 void add_osr_nmethod(nmethod* n);
998 bool remove_osr_nmethod(nmethod* n);
999 int mark_osr_nmethods(const Method* m);
1000 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1001
1002 #if INCLUDE_JVMTI
1003 // Breakpoint support (see methods on Method* for details)
1004 BreakpointInfo* breakpoints() const { return _breakpoints; };
1005 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1006 #endif
1007
1008 // support for stub routines
1009 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1010 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
1011 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1012
1013 // subclass/subinterface checks
1014 bool implements_interface(Klass* k) const;
1015 bool is_same_or_direct_interface(Klass* k) const;
1016
1017 #ifdef ASSERT
1018 // check whether this class or one of its superclasses was redefined
1019 bool has_redefined_this_or_super() const;
1020 #endif
1021
1022 // Access to the implementor of an interface.
1023 Klass* implementor() const
1024 {
1025 Klass** k = adr_implementor();
1026 if (k == NULL) {
1027 return NULL;
1028 } else {
1029 return *k;
1030 }
1031 }
1032
1033 void set_implementor(Klass* k) {
1034 assert(is_interface(), "not interface");
1035 Klass** addr = adr_implementor();
1036 assert(addr != NULL, "null addr");
1037 if (addr != NULL) {
1038 *addr = k;
1039 }
1040 }
1041
1042 int nof_implementors() const {
1043 Klass* k = implementor();
1044 if (k == NULL) {
1045 return 0;
1046 } else if (k != this) {
1047 return 1;
1048 } else {
1049 return 2;
1050 }
1051 }
1052
1053 void add_implementor(Klass* k); // k is a new class that implements this interface
1054 void init_implementor(); // initialize
1055
1056 // link this class into the implementors list of every interface it implements
1057 void process_interfaces(Thread *thread);
1058
1059 // virtual operations from Klass
1060 bool is_leaf_class() const { return _subklass == NULL; }
1061 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1062 bool compute_is_subtype_of(Klass* k);
1063 bool can_be_primary_super_slow() const;
1064 int oop_size(oop obj) const { return size_helper(); }
1065 // slow because it's a virtual call and used for verifying the layout_helper.
1066 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1067 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1068
1069 // Iterators
1070 void do_local_static_fields(FieldClosure* cl);
1071 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1072 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1073
1074 void methods_do(void f(Method* method));
1075 void array_klasses_do(void f(Klass* k));
1076 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1077 bool super_types_do(SuperTypeClosure* blk);
1078
1079 static InstanceKlass* cast(Klass* k) {
1080 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1081 }
1082
1083 static const InstanceKlass* cast(const Klass* k) {
1084 assert(k != NULL, "k should not be null");
1085 assert(k->is_instance_klass(), "cast to InstanceKlass");
1086 return static_cast<const InstanceKlass*>(k);
1087 }
1088
1089 InstanceKlass* java_super() const {
1090 return (super() == NULL) ? NULL : cast(super());
1091 }
1092
1093 // Sizing (in words)
1094 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1095
1096 static int size(int vtable_length, int itable_length,
1097 int nonstatic_oop_map_size,
1098 bool is_interface, bool is_anonymous, bool has_stored_fingerprint,
1099 int java_fields, bool is_value_type) {
1100 return align_metadata_size(header_size() +
1101 (is_value_type ? (int)sizeof(address) : 0) +
1102 (is_value_type ? (int)sizeof(address) : 0) +
1103 vtable_length +
1104 itable_length +
1105 nonstatic_oop_map_size +
1106 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1107 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1108 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1109 (java_fields * (int)sizeof(Klass*)/wordSize) +
1110 (is_value_type ? (int)sizeof(Klass*) : 0) +
1111 (is_value_type ? (int)sizeof(intptr_t)*2 : 0));
1112 }
1113 int size() const { return size(vtable_length(),
1114 itable_length(),
1115 nonstatic_oop_map_size(),
1116 is_interface(),
1117 is_anonymous(),
1118 has_stored_fingerprint(),
1119 has_value_fields() ? java_fields_count() : 0,
1120 is_value());
1121 }
1122 #if INCLUDE_SERVICES
1123 virtual void collect_statistics(KlassSizeStats *sz) const;
1124 #endif
1125
1126 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + (is_value() ? 2 : 0 ) + vtable_length(); }
1127 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1128
1129 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1130
1131 address static_field_addr(int offset);
1132
1133 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1134
1135 OopMapBlock* start_of_nonstatic_oop_maps() const {
1136 return (OopMapBlock*)(start_of_itable() + itable_length());
1137 }
1138
1139 Klass** end_of_nonstatic_oop_maps() const {
1140 return (Klass**)(start_of_nonstatic_oop_maps() +
1141 nonstatic_oop_map_count());
1142 }
1143
1144 Klass** adr_implementor() const {
1145 if (is_interface()) {
1146 return (Klass**)end_of_nonstatic_oop_maps();
1147 } else {
1148 return NULL;
1149 }
1150 };
1151
1152 InstanceKlass** adr_host_klass() const {
1153 if (is_anonymous()) {
1154 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1155 if (adr_impl != NULL) {
1156 return adr_impl + 1;
1157 } else {
1158 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1159 }
1160 } else {
1161 return NULL;
1162 }
1163 }
1164
1165 address adr_fingerprint() const {
1166 if (has_stored_fingerprint()) {
1167 InstanceKlass** adr_host = adr_host_klass();
1168 if (adr_host != NULL) {
1169 return (address)(adr_host + 1);
1170 }
1171
1172 Klass** adr_impl = adr_implementor();
1173 if (adr_impl != NULL) {
1174 return (address)(adr_impl + 1);
1175 }
1176
1177 return (address)end_of_nonstatic_oop_maps();
1178 } else {
1179 return NULL;
1180 }
1181 }
1182
1183 address adr_value_fields_klasses() const {
1184 if (has_value_fields()) {
1185 address adr_fing = adr_fingerprint();
1186 if (adr_fing != NULL) {
1187 return adr_fingerprint() + sizeof(u8);
1188 }
1189
1190 InstanceKlass** adr_host = adr_host_klass();
1191 if (adr_host != NULL) {
1192 return (address)(adr_host + 1);
1193 }
1194
1195 Klass** adr_impl = adr_implementor();
1196 if (adr_impl != NULL) {
1197 return (address)(adr_impl + 1);
1198 }
1199
1200 return (address)end_of_nonstatic_oop_maps();
1201 } else {
1202 return NULL;
1203 }
1204 }
1205
1206 address adr_vcc_klass() const {
1207 if (has_vcc_klass()) {
1208 address adr_jf = adr_value_fields_klasses();
1209 if (adr_jf != NULL) {
1210 return adr_jf + this->java_fields_count() * sizeof(Klass*);
1211 }
1212
1213 address adr_fing = adr_fingerprint();
1214 if (adr_fing != NULL) {
1215 return adr_fingerprint() + sizeof(u8);
1216 }
1217
1218 InstanceKlass** adr_host = adr_host_klass();
1219 if (adr_host != NULL) {
1220 return (address)(adr_host + 1);
1221 }
1222
1223 Klass** adr_impl = adr_implementor();
1224 if (adr_impl != NULL) {
1225 return (address)(adr_impl + 1);
1226 }
1227
1228 return (address)end_of_nonstatic_oop_maps();
1229 } else {
1230 return NULL;
1231 }
1232 }
1233
1234 Klass* get_value_field_klass(int idx) {
1235 assert(has_value_fields(), "Sanity checking");
1236 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1237 assert(k != NULL, "Should always be set before being read");
1238 assert(k->is_value(), "Must be a value type");
1239 return k;
1240 }
1241
1242 void set_value_field_klass(int idx, Klass* k) {
1243 assert(has_value_fields(), "Sanity checking");
1244 assert(k != NULL, "Should not be set to NULL");
1245 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1246 ((Klass**)adr_value_fields_klasses())[idx] = k;
1247 }
1248
1249 Klass* get_vcc_klass() const {
1250 if (has_vcc_klass()) {
1251 Klass* k = *(Klass**)adr_vcc_klass();
1252 assert(k == NULL || !k->is_value(), "Must not be a value type");
1253 return k;
1254 }
1255 return NULL;
1256 }
1257
1258 void set_vcc_klass(Klass* k) {
1259 assert(has_vcc_klass(), "Sanity checking");
1260 assert(k == NULL || !k->is_value(), "Must not be a value type");
1261 *(Klass**)adr_vcc_klass()= k;
1262 }
1263
1264 // Use this to return the size of an instance in heap words:
1265 virtual int size_helper() const {
1266 return layout_helper_to_size_helper(layout_helper());
1267 }
1268
1269 // This bit is initialized in classFileParser.cpp.
1270 // It is false under any of the following conditions:
1271 // - the class is abstract (including any interface)
1272 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1273 // - the class size is larger than FastAllocateSizeLimit
1274 // - the class is java/lang/Class, which cannot be allocated directly
1275 bool can_be_fastpath_allocated() const {
1276 return !layout_helper_needs_slow_path(layout_helper());
1277 }
1278
1279 // Java itable
1280 klassItable itable() const; // return klassItable wrapper
1281 Method* method_at_itable(Klass* holder, int index, TRAPS);
1282
1283 #if INCLUDE_JVMTI
1284 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1285 #endif // INCLUDE_JVMTI
1286
1287 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1288 void clean_implementors_list(BoolObjectClosure* is_alive);
1289 void clean_method_data(BoolObjectClosure* is_alive);
1290
1291 // Explicit metaspace deallocation of fields
1292 // For RedefineClasses and class file parsing errors, we need to deallocate
1293 // instanceKlasses and the metadata they point to.
1294 void deallocate_contents(ClassLoaderData* loader_data);
1295 static void deallocate_methods(ClassLoaderData* loader_data,
1296 Array<Method*>* methods);
1297 void static deallocate_interfaces(ClassLoaderData* loader_data,
1298 const Klass* super_klass,
1299 Array<Klass*>* local_interfaces,
1300 Array<Klass*>* transitive_interfaces);
1301
1302 // The constant pool is on stack if any of the methods are executing or
1303 // referenced by handles.
1304 bool on_stack() const { return _constants->on_stack(); }
1305
1306 // callbacks for actions during class unloading
1307 static void notify_unload_class(InstanceKlass* ik);
1308 static void release_C_heap_structures(InstanceKlass* ik);
1309
1310 // Naming
1311 const char* signature_name() const;
1312 static Symbol* package_from_name(const Symbol* name, TRAPS);
1313
1314 // GC specific object visitors
1315 //
1316 #if INCLUDE_ALL_GCS
1317 // Parallel Scavenge
1318 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1319 // Parallel Compact
1320 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1321 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1322 #endif
1323
1324 // Oop fields (and metadata) iterators
1325 // [nv = true] Use non-virtual calls to do_oop_nv.
1326 // [nv = false] Use virtual calls to do_oop.
1327 //
1328 // The InstanceKlass iterators also visits the Object's klass.
1329
1330 // Forward iteration
1331 public:
1332 // Iterate over all oop fields in the oop maps.
1333 template <bool nv, class OopClosureType>
1334 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1335
1336 protected:
1337 // Iterate over all oop fields and metadata.
1338 template <bool nv, class OopClosureType>
1339 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1340
1341 private:
1342 // Iterate over all oop fields in the oop maps.
1343 // Specialized for [T = oop] or [T = narrowOop].
1344 template <bool nv, typename T, class OopClosureType>
1345 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1346
1347 // Iterate over all oop fields in one oop map.
1348 template <bool nv, typename T, class OopClosureType>
1349 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1350
1351
1352 // Reverse iteration
1353 #if INCLUDE_ALL_GCS
1354 public:
1355 // Iterate over all oop fields in the oop maps.
1356 template <bool nv, class OopClosureType>
1357 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1358
1359 protected:
1360 // Iterate over all oop fields and metadata.
1361 template <bool nv, class OopClosureType>
1362 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1363
1364 private:
1365 // Iterate over all oop fields in the oop maps.
1366 // Specialized for [T = oop] or [T = narrowOop].
1367 template <bool nv, typename T, class OopClosureType>
1368 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1369
1370 // Iterate over all oop fields in one oop map.
1371 template <bool nv, typename T, class OopClosureType>
1372 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1373 #endif
1374
1375
1376 // Bounded range iteration
1377 public:
1378 // Iterate over all oop fields in the oop maps.
1379 template <bool nv, class OopClosureType>
1380 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1381
1382 protected:
1383 // Iterate over all oop fields and metadata.
1384 template <bool nv, class OopClosureType>
1385 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1386
1387 private:
1388 // Iterate over all oop fields in the oop maps.
1389 // Specialized for [T = oop] or [T = narrowOop].
1390 template <bool nv, typename T, class OopClosureType>
1391 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1392
1393 // Iterate over all oop fields in one oop map.
1394 template <bool nv, typename T, class OopClosureType>
1395 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1396
1397
1398 public:
1399
1400 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1401 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1402
1403 #if INCLUDE_ALL_GCS
1404 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1405 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1406 #endif // INCLUDE_ALL_GCS
1407
1408 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1409
1410 public:
1411 void set_in_error_state() {
1412 assert(DumpSharedSpaces, "only call this when dumping archive");
1413 _init_state = initialization_error;
1414 }
1415 bool check_sharing_error_state();
1416
1417 private:
1418 // initialization state
1419 #ifdef ASSERT
1420 void set_init_state(ClassState state);
1421 #else
1422 void set_init_state(ClassState state) { _init_state = (u1)state; }
1423 #endif
1424 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1425 void set_init_thread(Thread *thread) { _init_thread = thread; }
1426
1427 // The RedefineClasses() API can cause new method idnums to be needed
1428 // which will cause the caches to grow. Safety requires different
1429 // cache management logic if the caches can grow instead of just
1430 // going from NULL to non-NULL.
1431 bool idnum_can_increment() const { return has_been_redefined(); }
1432 inline jmethodID* methods_jmethod_ids_acquire() const;
1433 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1434
1435 // Lock during initialization
1436 public:
1437 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1438 // Must be one per class and it has to be a VM internal object so java code
1439 // cannot lock it (like the mirror).
1440 // It has to be an object not a Mutex because it's held through java calls.
1441 oop init_lock() const;
1442 private:
1443 void fence_and_clear_init_lock();
1444
1445 bool link_class_impl (bool throw_verifyerror, TRAPS);
1446 bool verify_code (bool throw_verifyerror, TRAPS);
1447 void initialize_impl (TRAPS);
1448 void initialize_super_interfaces (TRAPS);
1449 void eager_initialize_impl ();
1450 /* jni_id_for_impl for jfieldID only */
1451 JNIid* jni_id_for_impl (int offset);
1452 protected:
1453 // Returns the array class for the n'th dimension
1454 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
1455
1456 // Returns the array class with this class as element type
1457 virtual Klass* array_klass_impl(bool or_null, TRAPS);
1458
1459 private:
1460
1461 // find a local method (returns NULL if not found)
1462 Method* find_method_impl(const Symbol* name,
1463 const Symbol* signature,
1464 OverpassLookupMode overpass_mode,
1465 StaticLookupMode static_mode,
1466 PrivateLookupMode private_mode) const;
1467
1468 static Method* find_method_impl(const Array<Method*>* methods,
1469 const Symbol* name,
1470 const Symbol* signature,
1471 OverpassLookupMode overpass_mode,
1472 StaticLookupMode static_mode,
1473 PrivateLookupMode private_mode);
1474
1475 // Free CHeap allocated fields.
1476 void release_C_heap_structures();
1477
1478 #if INCLUDE_JVMTI
1479 // RedefineClasses support
1480 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1481 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1482 #endif
1483 public:
1484 // CDS support - remove and restore oops from metadata. Oops are not shared.
1485 virtual void remove_unshareable_info();
1486 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1487
1488 // jvm support
1489 jint compute_modifier_flags(TRAPS) const;
1490
1491 //Valhalla prototype ValueCapableClass
1492 void create_value_capable_class(Handle class_loader, Handle protection_domain, TRAPS);
1493
1494 public:
1495 // JVMTI support
1496 jint jvmti_class_status() const;
1497
1498 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1499
1500 public:
1501 // Printing
1502 #ifndef PRODUCT
1503 void print_on(outputStream* st) const;
1504 #endif
1505 void print_value_on(outputStream* st) const;
1506
1507 void oop_print_value_on(oop obj, outputStream* st);
1508
1509 #ifndef PRODUCT
1510 void oop_print_on (oop obj, outputStream* st);
1511
1512 void print_dependent_nmethods(bool verbose = false);
1513 bool is_dependent_nmethod(nmethod* nm);
1514 #endif
1515
1516 const char* internal_name() const;
1517
1518 // Verification
1519 void verify_on(outputStream* st);
1520
1521 void oop_verify_on(oop obj, outputStream* st);
1522
1523 // Logging
1524 void print_class_load_logging(ClassLoaderData* loader_data,
1525 const char* module_name,
1526 const ClassFileStream* cfs) const;
1527 };
1528
1529 // for adding methods
1530 // UNSET_IDNUM return means no more ids available
1531 inline u2 InstanceKlass::next_method_idnum() {
1532 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1533 return ConstMethod::UNSET_IDNUM; // no more ids available
1534 } else {
1535 return _idnum_allocated_count++;
1536 }
1537 }
1538
1539
1540 /* JNIid class for jfieldIDs only */
1541 class JNIid: public CHeapObj<mtClass> {
1542 friend class VMStructs;
1543 private:
1544 Klass* _holder;
1545 JNIid* _next;
1546 int _offset;
1547 #ifdef ASSERT
1548 bool _is_static_field_id;
1549 #endif
1550
1551 public:
1552 // Accessors
1553 Klass* holder() const { return _holder; }
1554 int offset() const { return _offset; }
1555 JNIid* next() { return _next; }
1556 // Constructor
1557 JNIid(Klass* holder, int offset, JNIid* next);
1558 // Identifier lookup
1559 JNIid* find(int offset);
1560
1561 bool find_local_field(fieldDescriptor* fd) {
1562 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1563 }
1564
1565 static void deallocate(JNIid* id);
1566 // Debugging
1567 #ifdef ASSERT
1568 bool is_static_field_id() const { return _is_static_field_id; }
1569 void set_is_static_field_id() { _is_static_field_id = true; }
1570 #endif
1571 void verify(Klass* holder);
1572 };
1573
1574 // An iterator that's used to access the inner classes indices in the
1575 // InstanceKlass::_inner_classes array.
1576 class InnerClassesIterator : public StackObj {
1577 private:
1578 Array<jushort>* _inner_classes;
1579 int _length;
1580 int _idx;
1581 public:
1582
1583 InnerClassesIterator(const InstanceKlass* k) {
1584 _inner_classes = k->inner_classes();
1585 if (k->inner_classes() != NULL) {
1586 _length = _inner_classes->length();
1587 // The inner class array's length should be the multiple of
1588 // inner_class_next_offset if it only contains the InnerClasses
1589 // attribute data, or it should be
1590 // n*inner_class_next_offset+enclosing_method_attribute_size
1591 // if it also contains the EnclosingMethod data.
1592 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1593 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1594 "just checking");
1595 // Remove the enclosing_method portion if exists.
1596 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1597 _length -= InstanceKlass::enclosing_method_attribute_size;
1598 }
1599 } else {
1600 _length = 0;
1601 }
1602 _idx = 0;
1603 }
1604
1605 int length() const {
1606 return _length;
1607 }
1608
1609 void next() {
1610 _idx += InstanceKlass::inner_class_next_offset;
1611 }
1612
1613 bool done() const {
1614 return (_idx >= _length);
1615 }
1616
1617 u2 inner_class_info_index() const {
1618 return _inner_classes->at(
1619 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1620 }
1621
1622 void set_inner_class_info_index(u2 index) {
1623 _inner_classes->at_put(
1624 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1625 }
1626
1627 u2 outer_class_info_index() const {
1628 return _inner_classes->at(
1629 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1630 }
1631
1632 void set_outer_class_info_index(u2 index) {
1633 _inner_classes->at_put(
1634 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1635 }
1636
1637 u2 inner_name_index() const {
1638 return _inner_classes->at(
1639 _idx + InstanceKlass::inner_class_inner_name_offset);
1640 }
1641
1642 void set_inner_name_index(u2 index) {
1643 _inner_classes->at_put(
1644 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1645 }
1646
1647 u2 inner_access_flags() const {
1648 return _inner_classes->at(
1649 _idx + InstanceKlass::inner_class_access_flags_offset);
1650 }
1651 };
1652
1653 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP