1 /*
2 * Copyright (c) 1997, 2015, 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/classLoaderData.hpp"
29 #include "gc/shared/specialized_oop_closures.hpp"
30 #include "memory/referenceType.hpp"
31 #include "oops/annotations.hpp"
32 #include "oops/constMethod.hpp"
33 #include "oops/fieldInfo.hpp"
34 #include "oops/instanceOop.hpp"
35 #include "oops/klassVtable.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "trace/traceMacros.hpp"
39 #include "utilities/accessFlags.hpp"
40 #include "utilities/bitMap.inline.hpp"
41 #include "utilities/macros.hpp"
42
43 // An InstanceKlass is the VM level representation of a Java class.
44 // It contains all information needed for at class at execution runtime.
45
46 // InstanceKlass embedded field layout (after declared fields):
47 // [EMBEDDED Java vtable ] size in words = vtable_len
48 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
49 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
50 // indicating where oops are located in instances of this klass.
51 // [EMBEDDED implementor of the interface] only exist for interface
52 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
53
54
55 // forward declaration for class -- see below for definition
56 class BreakpointInfo;
57 class DepChange;
58 class DependencyContext;
59 class fieldDescriptor;
60 class jniIdMapBase;
61 class JNIid;
62 class JvmtiCachedClassFieldMap;
63 class MemberNameTable;
64 class SuperTypeClosure;
65
66 // This is used in iterators below.
67 class FieldClosure: public StackObj {
68 public:
69 virtual void do_field(fieldDescriptor* fd) = 0;
70 };
71
72 #ifndef PRODUCT
73 // Print fields.
74 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
75 class FieldPrinter: public FieldClosure {
76 oop _obj;
77 outputStream* _st;
78 public:
79 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
80 void do_field(fieldDescriptor* fd);
81 };
82 #endif // !PRODUCT
83
84 // ValueObjs embedded in klass. Describes where oops are located in instances of
85 // this klass.
86 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
87 public:
88 // Byte offset of the first oop mapped by this block.
89 int offset() const { return _offset; }
90 void set_offset(int offset) { _offset = offset; }
91
92 // Number of oops in this block.
93 uint count() const { return _count; }
94 void set_count(uint count) { _count = count; }
95
96 // sizeof(OopMapBlock) in HeapWords.
97 static const int size_in_words() {
98 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
99 LogHeapWordSize;
100 }
101
102 private:
103 int _offset;
104 uint _count;
105 };
106
107 struct JvmtiCachedClassFileData;
108
109 class InstanceKlass: public Klass {
110 friend class VMStructs;
111 friend class ClassFileParser;
112 friend class CompileReplay;
113
114 protected:
115 // Constructor
116 InstanceKlass(int vtable_len,
117 int itable_len,
118 int static_field_size,
119 int nonstatic_oop_map_size,
120 unsigned kind,
121 ReferenceType rt,
122 AccessFlags access_flags,
123 bool is_anonymous);
124 public:
125 static InstanceKlass* allocate_instance_klass(
126 ClassLoaderData* loader_data,
127 int vtable_len,
128 int itable_len,
129 int static_field_size,
130 int nonstatic_oop_map_size,
131 ReferenceType rt,
132 AccessFlags access_flags,
133 Symbol* name,
134 Klass* super_klass,
135 bool is_anonymous,
136 TRAPS);
137
138 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
139
140 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
141 // of the class loading & initialization procedure, and the use of the states.
142 enum ClassState {
143 allocated, // allocated (but not yet linked)
144 loaded, // loaded and inserted in class hierarchy (but not linked yet)
145 linked, // successfully linked/verified (but not initialized yet)
146 being_initialized, // currently running class initializer
147 fully_initialized, // initialized (successfull final state)
148 initialization_error // error happened during initialization
149 };
150
151 static int number_of_instance_classes() { return _total_instanceKlass_count; }
152
153 private:
154 static volatile int _total_instanceKlass_count;
155
156 protected:
157 // Annotations for this class
158 Annotations* _annotations;
159 // Array classes holding elements of this class.
160 Klass* _array_klasses;
161 // Constant pool for this class.
162 ConstantPool* _constants;
163 // The InnerClasses attribute and EnclosingMethod attribute. The
164 // _inner_classes is an array of shorts. If the class has InnerClasses
165 // attribute, then the _inner_classes array begins with 4-tuples of shorts
166 // [inner_class_info_index, outer_class_info_index,
167 // inner_name_index, inner_class_access_flags] for the InnerClasses
168 // attribute. If the EnclosingMethod attribute exists, it occupies the
169 // last two shorts [class_index, method_index] of the array. If only
170 // the InnerClasses attribute exists, the _inner_classes array length is
171 // number_of_inner_classes * 4. If the class has both InnerClasses
172 // and EnclosingMethod attributes the _inner_classes array length is
173 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
174 Array<jushort>* _inner_classes;
175
176 // the source debug extension for this klass, NULL if not specified.
177 // Specified as UTF-8 string without terminating zero byte in the classfile,
178 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
179 char* _source_debug_extension;
180 // Array name derived from this class which needs unreferencing
181 // if this class is unloaded.
182 Symbol* _array_name;
183
184 // Number of heapOopSize words used by non-static fields in this klass
185 // (including inherited fields but after header_size()).
186 int _nonstatic_field_size;
187 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
188 // Constant pool index to the utf8 entry of the Generic signature,
189 // or 0 if none.
190 u2 _generic_signature_index;
191 // Constant pool index to the utf8 entry for the name of source file
192 // containing this klass, 0 if not specified.
193 u2 _source_file_name_index;
194 u2 _static_oop_field_count;// number of static oop fields in this klass
195 u2 _java_fields_count; // The number of declared Java fields
196 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
197
198 // _is_marked_dependent can be set concurrently, thus cannot be part of the
199 // _misc_flags.
200 bool _is_marked_dependent; // used for marking during flushing and deoptimization
201
202 // The low two bits of _misc_flags contains the kind field.
203 // This can be used to quickly discriminate among the four kinds of
204 // InstanceKlass.
205
206 static const unsigned _misc_kind_field_size = 2;
207 static const unsigned _misc_kind_field_pos = 0;
208 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
209
210 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
211 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
212 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
213 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
214
215 // Start after _misc_kind field.
216 enum {
217 _misc_rewritten = 1 << 2, // methods rewritten.
218 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
219 _misc_should_verify_class = 1 << 4, // allow caching of preverification
220 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
221 _misc_is_contended = 1 << 6, // marked with contended annotation
222 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods
223 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
224 _misc_has_been_redefined = 1 << 9, // class has been redefined
225 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class
226 };
227 u2 _misc_flags;
228 u2 _minor_version; // minor version number of class file
229 u2 _major_version; // major version number of class file
230 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
231 int _vtable_len; // length of Java vtable (in words)
232 int _itable_len; // length of Java itable (in words)
233 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
234 MemberNameTable* _member_names; // Member names
235 JNIid* _jni_ids; // First JNI identifier for static fields in this class
236 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
237 intptr_t _dep_context; // packed DependencyContext structure
238 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
239 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
240 // Linked instanceKlasses of previous versions
241 InstanceKlass* _previous_versions;
242 // JVMTI fields can be moved to their own structure - see 6315920
243 // JVMTI: cached class file, before retransformable agent modified it in CFLH
244 JvmtiCachedClassFileData* _cached_class_file;
245
246 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
247
248 // Class states are defined as ClassState (see above).
249 // Place the _init_state here to utilize the unused 2-byte after
250 // _idnum_allocated_count.
251 u1 _init_state; // state of class
252 u1 _reference_type; // reference type
253
254 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
255
256 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
257
258 // Method array.
259 Array<Method*>* _methods;
260 // Default Method Array, concrete methods inherited from interfaces
261 Array<Method*>* _default_methods;
262 // Interface (Klass*s) this class declares locally to implement.
263 Array<Klass*>* _local_interfaces;
264 // Interface (Klass*s) this class implements transitively.
265 Array<Klass*>* _transitive_interfaces;
266 // Int array containing the original order of method in the class file (for JVMTI).
267 Array<int>* _method_ordering;
268 // Int array containing the vtable_indices for default_methods
269 // offset matches _default_methods offset
270 Array<int>* _default_vtable_indices;
271
272 // Instance and static variable information, starts with 6-tuples of shorts
273 // [access, name index, sig index, initval index, low_offset, high_offset]
274 // for all fields, followed by the generic signature data at the end of
275 // the array. Only fields with generic signature attributes have the generic
276 // signature data set in the array. The fields array looks like following:
277 //
278 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
279 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
280 // ...
281 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
282 // [generic signature index]
283 // [generic signature index]
284 // ...
285 Array<u2>* _fields;
286
287 // embedded Java vtable follows here
288 // embedded Java itables follows here
289 // embedded static fields follows here
290 // embedded nonstatic oop-map blocks follows here
291 // embedded implementor of this interface follows here
292 // The embedded implementor only exists if the current klass is an
293 // iterface. The possible values of the implementor fall into following
294 // three cases:
295 // NULL: no implementor.
296 // A Klass* that's not itself: one implementor.
297 // Itself: more than one implementors.
298 // embedded host klass follows here
299 // The embedded host klass only exists in an anonymous class for
300 // dynamic language support (JSR 292 enabled). The host class grants
301 // its access privileges to this class also. The host class is either
302 // named, or a previously loaded anonymous class. A non-anonymous class
303 // or an anonymous class loaded through normal classloading does not
304 // have this embedded field.
305 //
306
307 friend class SystemDictionary;
308
309 public:
310 bool has_nonstatic_fields() const {
311 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
312 }
313 void set_has_nonstatic_fields(bool b) {
314 if (b) {
315 _misc_flags |= _misc_has_nonstatic_fields;
316 } else {
317 _misc_flags &= ~_misc_has_nonstatic_fields;
318 }
319 }
320
321 // field sizes
322 int nonstatic_field_size() const { return _nonstatic_field_size; }
323 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
324
325 int static_field_size() const { return _static_field_size; }
326 void set_static_field_size(int size) { _static_field_size = size; }
327
328 int static_oop_field_count() const { return (int)_static_oop_field_count; }
329 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
330
331 // Java vtable
332 int vtable_length() const { return _vtable_len; }
333 void set_vtable_length(int len) { _vtable_len = len; }
334
335 // Java itable
336 int itable_length() const { return _itable_len; }
337 void set_itable_length(int len) { _itable_len = len; }
338
339 // array klasses
340 Klass* array_klasses() const { return _array_klasses; }
341 void set_array_klasses(Klass* k) { _array_klasses = k; }
342
343 // methods
344 Array<Method*>* methods() const { return _methods; }
345 void set_methods(Array<Method*>* a) { _methods = a; }
346 Method* method_with_idnum(int idnum);
347 Method* method_with_orig_idnum(int idnum);
348 Method* method_with_orig_idnum(int idnum, int version);
349
350 // method ordering
351 Array<int>* method_ordering() const { return _method_ordering; }
352 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
353 void copy_method_ordering(intArray* m, TRAPS);
354
355 // default_methods
356 Array<Method*>* default_methods() const { return _default_methods; }
357 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
358
359 // default method vtable_indices
360 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
361 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
362 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
363
364 // interfaces
365 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
366 void set_local_interfaces(Array<Klass*>* a) {
367 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
368 _local_interfaces = a; }
369
370 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
371 void set_transitive_interfaces(Array<Klass*>* a) {
372 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
373 _transitive_interfaces = a;
374 }
375
376 private:
377 friend class fieldDescriptor;
378 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
379
380 public:
381 int field_offset (int index) const { return field(index)->offset(); }
382 int field_access_flags(int index) const { return field(index)->access_flags(); }
383 Symbol* field_name (int index) const { return field(index)->name(constants()); }
384 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
385
386 // Number of Java declared fields
387 int java_fields_count() const { return (int)_java_fields_count; }
388
389 Array<u2>* fields() const { return _fields; }
390 void set_fields(Array<u2>* f, u2 java_fields_count) {
391 guarantee(_fields == NULL || f == NULL, "Just checking");
392 _fields = f;
393 _java_fields_count = java_fields_count;
394 }
395
396 // inner classes
397 Array<u2>* inner_classes() const { return _inner_classes; }
398 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
399
400 enum InnerClassAttributeOffset {
401 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
402 inner_class_inner_class_info_offset = 0,
403 inner_class_outer_class_info_offset = 1,
404 inner_class_inner_name_offset = 2,
405 inner_class_access_flags_offset = 3,
406 inner_class_next_offset = 4
407 };
408
409 enum EnclosingMethodAttributeOffset {
410 enclosing_method_class_index_offset = 0,
411 enclosing_method_method_index_offset = 1,
412 enclosing_method_attribute_size = 2
413 };
414
415 // method override check
416 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
417
418 // package
419 bool is_same_class_package(Klass* class2);
420 bool is_same_class_package(oop classloader2, Symbol* classname2);
421 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
422
423 // find an enclosing class
424 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
425 instanceKlassHandle self(THREAD, this);
426 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
427 }
428 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
429 bool* inner_is_member, TRAPS);
430
431 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
432 static bool find_inner_classes_attr(instanceKlassHandle k,
433 int* ooff, int* noff, TRAPS);
434
435 // tell if two classes have the same enclosing class (at package level)
436 bool is_same_package_member(Klass* class2, TRAPS) {
437 instanceKlassHandle self(THREAD, this);
438 return is_same_package_member_impl(self, class2, THREAD);
439 }
440 static bool is_same_package_member_impl(instanceKlassHandle self,
441 Klass* class2, TRAPS);
442
443 // initialization state
444 bool is_loaded() const { return _init_state >= loaded; }
445 bool is_linked() const { return _init_state >= linked; }
446 bool is_initialized() const { return _init_state == fully_initialized; }
447 bool is_not_initialized() const { return _init_state < being_initialized; }
448 bool is_being_initialized() const { return _init_state == being_initialized; }
449 bool is_in_error_state() const { return _init_state == initialization_error; }
450 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
451 ClassState init_state() { return (ClassState)_init_state; }
452 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
453
454 // defineClass specified verification
455 bool should_verify_class() const {
456 return (_misc_flags & _misc_should_verify_class) != 0;
457 }
458 void set_should_verify_class(bool value) {
459 if (value) {
460 _misc_flags |= _misc_should_verify_class;
461 } else {
462 _misc_flags &= ~_misc_should_verify_class;
463 }
464 }
465
466 // marking
467 bool is_marked_dependent() const { return _is_marked_dependent; }
468 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
469
470 // initialization (virtuals from Klass)
471 bool should_be_initialized() const; // means that initialize should be called
472 void initialize(TRAPS);
473 void link_class(TRAPS);
474 bool link_class_or_fail(TRAPS); // returns false on failure
475 void unlink_class();
476 void rewrite_class(TRAPS);
477 void link_methods(TRAPS);
478 Method* class_initializer();
479
480 // set the class to initialized if no static initializer is present
481 void eager_initialize(Thread *thread);
482
483 // reference type
484 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
485 void set_reference_type(ReferenceType t) {
486 assert(t == (u1)t, "overflow");
487 _reference_type = (u1)t;
488 }
489
490 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
491
492 // find local field, returns true if found
493 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
494 // find field in direct superinterfaces, returns the interface in which the field is defined
495 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
496 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
497 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
498 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
499 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
500
501 // find a non-static or static field given its offset within the class.
502 bool contains_field_offset(int offset) {
503 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
504 }
505
506 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
507 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
508
509 // find a local method (returns NULL if not found)
510 Method* find_method(Symbol* name, Symbol* signature) const;
511 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
512
513 // find a local method, but skip static methods
514 Method* find_instance_method(Symbol* name, Symbol* signature);
515 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
516
517 // find a local method (returns NULL if not found)
518 Method* find_local_method(Symbol* name, Symbol* signature,
519 OverpassLookupMode overpass_mode,
520 StaticLookupMode static_mode,
521 PrivateLookupMode private_mode) const;
522
523 // find a local method from given methods array (returns NULL if not found)
524 static Method* find_local_method(Array<Method*>* methods,
525 Symbol* name, Symbol* signature,
526 OverpassLookupMode overpass_mode,
527 StaticLookupMode static_mode,
528 PrivateLookupMode private_mode);
529
530 // true if method matches signature and conforms to skipping_X conditions.
531 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
532
533 // find a local method index in methods or default_methods (returns -1 if not found)
534 static int find_method_index(Array<Method*>* methods,
535 Symbol* name, Symbol* signature,
536 OverpassLookupMode overpass_mode,
537 StaticLookupMode static_mode,
538 PrivateLookupMode private_mode);
539
540 // lookup operation (returns NULL if not found)
541 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
542
543 // lookup a method in all the interfaces that this class implements
544 // (returns NULL if not found)
545 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
546
547 // lookup a method in local defaults then in all interfaces
548 // (returns NULL if not found)
549 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
550
551 // Find method indices by name. If a method with the specified name is
552 // found the index to the first method is returned, and 'end' is filled in
553 // with the index of first non-name-matching method. If no method is found
554 // -1 is returned.
555 int find_method_by_name(Symbol* name, int* end);
556 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
557
558 // constant pool
559 ConstantPool* constants() const { return _constants; }
560 void set_constants(ConstantPool* c) { _constants = c; }
561
562 // protection domain
563 oop protection_domain() const;
564
565 // signers
566 objArrayOop signers() const;
567
568 // host class
569 Klass* host_klass() const {
570 Klass** hk = (Klass**)adr_host_klass();
571 if (hk == NULL) {
572 return NULL;
573 } else {
574 assert(*hk != NULL, "host klass should always be set if the address is not null");
575 return *hk;
576 }
577 }
578 void set_host_klass(Klass* host) {
579 assert(is_anonymous(), "not anonymous");
580 Klass** addr = (Klass**)adr_host_klass();
581 assert(addr != NULL, "no reversed space");
582 if (addr != NULL) {
583 *addr = host;
584 }
585 }
586 bool is_anonymous() const {
587 return (_misc_flags & _misc_is_anonymous) != 0;
588 }
589 void set_is_anonymous(bool value) {
590 if (value) {
591 _misc_flags |= _misc_is_anonymous;
592 } else {
593 _misc_flags &= ~_misc_is_anonymous;
594 }
595 }
596
597 // Oop that keeps the metadata for this class from being unloaded
598 // in places where the metadata is stored in other places, like nmethods
599 oop klass_holder() const {
600 return is_anonymous() ? java_mirror() : class_loader();
601 }
602
603 bool is_contended() const {
604 return (_misc_flags & _misc_is_contended) != 0;
605 }
606 void set_is_contended(bool value) {
607 if (value) {
608 _misc_flags |= _misc_is_contended;
609 } else {
610 _misc_flags &= ~_misc_is_contended;
611 }
612 }
613
614 // source file name
615 Symbol* source_file_name() const {
616 return (_source_file_name_index == 0) ?
617 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
618 }
619 u2 source_file_name_index() const {
620 return _source_file_name_index;
621 }
622 void set_source_file_name_index(u2 sourcefile_index) {
623 _source_file_name_index = sourcefile_index;
624 }
625
626 // minor and major version numbers of class file
627 u2 minor_version() const { return _minor_version; }
628 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
629 u2 major_version() const { return _major_version; }
630 void set_major_version(u2 major_version) { _major_version = major_version; }
631
632 // source debug extension
633 char* source_debug_extension() const { return _source_debug_extension; }
634 void set_source_debug_extension(char* array, int length);
635
636 // symbol unloading support (refcount already added)
637 Symbol* array_name() { return _array_name; }
638 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
639
640 // nonstatic oop-map blocks
641 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
642 return oop_map_count * OopMapBlock::size_in_words();
643 }
644 unsigned int nonstatic_oop_map_count() const {
645 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
646 }
647 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
648 void set_nonstatic_oop_map_size(int words) {
649 _nonstatic_oop_map_size = words;
650 }
651
652 // RedefineClasses() support for previous versions:
653 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
654
655 InstanceKlass* previous_versions() const { return _previous_versions; }
656
657 InstanceKlass* get_klass_version(int version) {
658 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
659 if (ik->constants()->version() == version) {
660 return ik;
661 }
662 }
663 return NULL;
664 }
665
666 bool has_been_redefined() const {
667 return (_misc_flags & _misc_has_been_redefined) != 0;
668 }
669 void set_has_been_redefined() {
670 _misc_flags |= _misc_has_been_redefined;
671 }
672
673 bool is_scratch_class() const {
674 return (_misc_flags & _misc_is_scratch_class) != 0;
675 }
676
677 void set_is_scratch_class() {
678 _misc_flags |= _misc_is_scratch_class;
679 }
680
681 private:
682
683 void set_kind(unsigned kind) {
684 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
685 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
686 unsigned flags = _misc_flags & ~fmask;
687 _misc_flags = (flags | (kind << _misc_kind_field_pos));
688 }
689
690 bool is_kind(unsigned desired) const {
691 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
692 return kind == desired;
693 }
694
695 public:
696
697 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
698 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
699 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
700 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
701 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
702
703 void init_previous_versions() {
704 _previous_versions = NULL;
705 }
706
707 private:
708 static int _previous_version_count;
709 public:
710 static void purge_previous_versions(InstanceKlass* ik);
711 static bool has_previous_versions() { return _previous_version_count > 0; }
712
713 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
714 void set_cached_class_file(JvmtiCachedClassFileData *data) {
715 _cached_class_file = data;
716 }
717 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
718 jint get_cached_class_file_len();
719 unsigned char * get_cached_class_file_bytes();
720
721 // JVMTI: Support for caching of field indices, types, and offsets
722 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
723 _jvmti_cached_class_field_map = descriptor;
724 }
725 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
726 return _jvmti_cached_class_field_map;
727 }
728
729 bool has_default_methods() const {
730 return (_misc_flags & _misc_has_default_methods) != 0;
731 }
732 void set_has_default_methods(bool b) {
733 if (b) {
734 _misc_flags |= _misc_has_default_methods;
735 } else {
736 _misc_flags &= ~_misc_has_default_methods;
737 }
738 }
739
740 bool declares_default_methods() const {
741 return (_misc_flags & _misc_declares_default_methods) != 0;
742 }
743 void set_declares_default_methods(bool b) {
744 if (b) {
745 _misc_flags |= _misc_declares_default_methods;
746 } else {
747 _misc_flags &= ~_misc_declares_default_methods;
748 }
749 }
750
751 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
752 inline u2 next_method_idnum();
753 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
754
755 // generics support
756 Symbol* generic_signature() const {
757 return (_generic_signature_index == 0) ?
758 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
759 }
760 u2 generic_signature_index() const {
761 return _generic_signature_index;
762 }
763 void set_generic_signature_index(u2 sig_index) {
764 _generic_signature_index = sig_index;
765 }
766
767 u2 enclosing_method_data(int offset);
768 u2 enclosing_method_class_index() {
769 return enclosing_method_data(enclosing_method_class_index_offset);
770 }
771 u2 enclosing_method_method_index() {
772 return enclosing_method_data(enclosing_method_method_index_offset);
773 }
774 void set_enclosing_method_indices(u2 class_index,
775 u2 method_index);
776
777 // jmethodID support
778 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
779 const methodHandle& method_h);
780 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
781 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
782 jmethodID* to_dealloc_id_p,
783 jmethodID** to_dealloc_jmeths_p);
784 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
785 size_t *length_p, jmethodID* id_p);
786 void ensure_space_for_methodids(int start_offset = 0);
787 jmethodID jmethod_id_or_null(Method* method);
788
789 // annotations support
790 Annotations* annotations() const { return _annotations; }
791 void set_annotations(Annotations* anno) { _annotations = anno; }
792
793 AnnotationArray* class_annotations() const {
794 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
795 }
796 Array<AnnotationArray*>* fields_annotations() const {
797 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
798 }
799 AnnotationArray* class_type_annotations() const {
800 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
801 }
802 Array<AnnotationArray*>* fields_type_annotations() const {
803 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
804 }
805 // allocation
806 instanceOop allocate_instance(TRAPS);
807
808 // additional member function to return a handle
809 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
810
811 objArrayOop allocate_objArray(int n, int length, TRAPS);
812 // Helper function
813 static instanceOop register_finalizer(instanceOop i, TRAPS);
814
815 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
816 // if not, throw either an Error or an Exception.
817 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
818
819 // initialization
820 void call_class_initializer(TRAPS);
821 void set_initialization_state_and_notify(ClassState state, TRAPS);
822
823 // OopMapCache support
824 OopMapCache* oop_map_cache() { return _oop_map_cache; }
825 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
826 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
827
828 // JNI identifier support (for static fields - for jni performance)
829 JNIid* jni_ids() { return _jni_ids; }
830 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
831 JNIid* jni_id_for(int offset);
832
833 // maintenance of deoptimization dependencies
834 inline DependencyContext dependencies();
835 int mark_dependent_nmethods(DepChange& changes);
836 void add_dependent_nmethod(nmethod* nm);
837 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
838
839 // On-stack replacement support
840 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
841 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
842 void add_osr_nmethod(nmethod* n);
843 void remove_osr_nmethod(nmethod* n);
844 int mark_osr_nmethods(const Method* m);
845 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
846
847 // Breakpoint support (see methods on Method* for details)
848 BreakpointInfo* breakpoints() const { return _breakpoints; };
849 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
850
851 // support for stub routines
852 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
853 TRACE_DEFINE_OFFSET;
854 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
855
856 // subclass/subinterface checks
857 bool implements_interface(Klass* k) const;
858 bool is_same_or_direct_interface(Klass* k) const;
859
860 #ifdef ASSERT
861 // check whether this class or one of its superclasses was redefined
862 bool has_redefined_this_or_super();
863 #endif
864
865 // Access to the implementor of an interface.
866 Klass* implementor() const
867 {
868 Klass** k = adr_implementor();
869 if (k == NULL) {
870 return NULL;
871 } else {
872 return *k;
873 }
874 }
875
876 void set_implementor(Klass* k) {
877 assert(is_interface(), "not interface");
878 Klass** addr = adr_implementor();
879 assert(addr != NULL, "null addr");
880 if (addr != NULL) {
881 *addr = k;
882 }
883 }
884
885 int nof_implementors() const {
886 Klass* k = implementor();
887 if (k == NULL) {
888 return 0;
889 } else if (k != this) {
890 return 1;
891 } else {
892 return 2;
893 }
894 }
895
896 void add_implementor(Klass* k); // k is a new class that implements this interface
897 void init_implementor(); // initialize
898
899 // link this class into the implementors list of every interface it implements
900 void process_interfaces(Thread *thread);
901
902 // virtual operations from Klass
903 bool is_leaf_class() const { return _subklass == NULL; }
904 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
905 bool compute_is_subtype_of(Klass* k);
906 bool can_be_primary_super_slow() const;
907 int oop_size(oop obj) const { return size_helper(); }
908 // slow because it's a virtual call and used for verifying the layout_helper.
909 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
910 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
911
912 // Iterators
913 void do_local_static_fields(FieldClosure* cl);
914 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
915 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
916
917 void methods_do(void f(Method* method));
918 void array_klasses_do(void f(Klass* k));
919 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
920 bool super_types_do(SuperTypeClosure* blk);
921
922 // Casting from Klass*
923 static InstanceKlass* cast(Klass* k) {
924 assert(k != NULL, "k should not be null");
925 assert(k->is_instance_klass(), "cast to InstanceKlass");
926 return static_cast<InstanceKlass*>(k);
927 }
928
929 InstanceKlass* java_super() const {
930 return (super() == NULL) ? NULL : cast(super());
931 }
932
933 // Sizing (in words)
934 static int header_size() { return sizeof(InstanceKlass)/HeapWordSize; }
935
936 static int size(int vtable_length, int itable_length,
937 int nonstatic_oop_map_size,
938 bool is_interface, bool is_anonymous) {
939 return align_object_size(header_size() +
940 vtable_length +
941 itable_length +
942 nonstatic_oop_map_size +
943 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
944 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
945 }
946 int size() const { return size(vtable_length(),
947 itable_length(),
948 nonstatic_oop_map_size(),
949 is_interface(),
950 is_anonymous());
951 }
952 #if INCLUDE_SERVICES
953 virtual void collect_statistics(KlassSizeStats *sz) const;
954 #endif
955
956 static int vtable_start_offset() { return header_size(); }
957 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
958
959 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
960 intptr_t* start_of_itable() const { return start_of_vtable() + vtable_length(); }
961 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
962
963 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
964
965 address static_field_addr(int offset);
966
967 OopMapBlock* start_of_nonstatic_oop_maps() const {
968 return (OopMapBlock*)(start_of_itable() + itable_length());
969 }
970
971 Klass** end_of_nonstatic_oop_maps() const {
972 return (Klass**)(start_of_nonstatic_oop_maps() +
973 nonstatic_oop_map_count());
974 }
975
976 Klass** adr_implementor() const {
977 if (is_interface()) {
978 return (Klass**)end_of_nonstatic_oop_maps();
979 } else {
980 return NULL;
981 }
982 };
983
984 Klass** adr_host_klass() const {
985 if (is_anonymous()) {
986 Klass** adr_impl = adr_implementor();
987 if (adr_impl != NULL) {
988 return adr_impl + 1;
989 } else {
990 return end_of_nonstatic_oop_maps();
991 }
992 } else {
993 return NULL;
994 }
995 }
996
997 // Use this to return the size of an instance in heap words:
998 int size_helper() const {
999 return layout_helper_to_size_helper(layout_helper());
1000 }
1001
1002 // This bit is initialized in classFileParser.cpp.
1003 // It is false under any of the following conditions:
1004 // - the class is abstract (including any interface)
1005 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1006 // - the class size is larger than FastAllocateSizeLimit
1007 // - the class is java/lang/Class, which cannot be allocated directly
1008 bool can_be_fastpath_allocated() const {
1009 return !layout_helper_needs_slow_path(layout_helper());
1010 }
1011
1012 // Java vtable/itable
1013 klassVtable* vtable() const; // return new klassVtable wrapper
1014 inline Method* method_at_vtable(int index);
1015 klassItable* itable() const; // return new klassItable wrapper
1016 Method* method_at_itable(Klass* holder, int index, TRAPS);
1017
1018 #if INCLUDE_JVMTI
1019 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1020 #endif // INCLUDE_JVMTI
1021
1022 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1023 void clean_implementors_list(BoolObjectClosure* is_alive);
1024 void clean_method_data(BoolObjectClosure* is_alive);
1025
1026 // Explicit metaspace deallocation of fields
1027 // For RedefineClasses and class file parsing errors, we need to deallocate
1028 // instanceKlasses and the metadata they point to.
1029 void deallocate_contents(ClassLoaderData* loader_data);
1030 static void deallocate_methods(ClassLoaderData* loader_data,
1031 Array<Method*>* methods);
1032 void static deallocate_interfaces(ClassLoaderData* loader_data,
1033 Klass* super_klass,
1034 Array<Klass*>* local_interfaces,
1035 Array<Klass*>* transitive_interfaces);
1036
1037 // The constant pool is on stack if any of the methods are executing or
1038 // referenced by handles.
1039 bool on_stack() const { return _constants->on_stack(); }
1040
1041 // callbacks for actions during class unloading
1042 static void notify_unload_class(InstanceKlass* ik);
1043 static void release_C_heap_structures(InstanceKlass* ik);
1044
1045 // Naming
1046 const char* signature_name() const;
1047
1048 // GC specific object visitors
1049 //
1050 // Mark Sweep
1051 int oop_ms_adjust_pointers(oop obj);
1052 #if INCLUDE_ALL_GCS
1053 // Parallel Scavenge
1054 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1055 // Parallel Compact
1056 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1057 void oop_pc_update_pointers(oop obj);
1058 #endif
1059
1060 // Oop fields (and metadata) iterators
1061 // [nv = true] Use non-virtual calls to do_oop_nv.
1062 // [nv = false] Use virtual calls to do_oop.
1063 //
1064 // The InstanceKlass iterators also visits the Object's klass.
1065
1066 // Forward iteration
1067 public:
1068 // Iterate over all oop fields in the oop maps.
1069 template <bool nv, class OopClosureType>
1070 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1071
1072 protected:
1073 // Iterate over all oop fields and metadata.
1074 template <bool nv, class OopClosureType>
1075 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1076
1077 private:
1078 // Iterate over all oop fields in the oop maps.
1079 // Specialized for [T = oop] or [T = narrowOop].
1080 template <bool nv, typename T, class OopClosureType>
1081 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1082
1083 // Iterate over all oop fields in one oop map.
1084 template <bool nv, typename T, class OopClosureType>
1085 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1086
1087
1088 // Reverse iteration
1089 #if INCLUDE_ALL_GCS
1090 public:
1091 // Iterate over all oop fields in the oop maps.
1092 template <bool nv, class OopClosureType>
1093 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1094
1095 protected:
1096 // Iterate over all oop fields and metadata.
1097 template <bool nv, class OopClosureType>
1098 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1099
1100 private:
1101 // Iterate over all oop fields in the oop maps.
1102 // Specialized for [T = oop] or [T = narrowOop].
1103 template <bool nv, typename T, class OopClosureType>
1104 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1105
1106 // Iterate over all oop fields in one oop map.
1107 template <bool nv, typename T, class OopClosureType>
1108 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1109 #endif
1110
1111
1112 // Bounded range iteration
1113 public:
1114 // Iterate over all oop fields in the oop maps.
1115 template <bool nv, class OopClosureType>
1116 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1117
1118 protected:
1119 // Iterate over all oop fields and metadata.
1120 template <bool nv, class OopClosureType>
1121 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1122
1123 private:
1124 // Iterate over all oop fields in the oop maps.
1125 // Specialized for [T = oop] or [T = narrowOop].
1126 template <bool nv, typename T, class OopClosureType>
1127 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1128
1129 // Iterate over all oop fields in one oop map.
1130 template <bool nv, typename T, class OopClosureType>
1131 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1132
1133
1134 public:
1135
1136 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1137 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1138
1139 #if INCLUDE_ALL_GCS
1140 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1141 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1142 #endif // INCLUDE_ALL_GCS
1143
1144 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1145
1146 public:
1147 void set_in_error_state() {
1148 assert(DumpSharedSpaces, "only call this when dumping archive");
1149 _init_state = initialization_error;
1150 }
1151 bool check_sharing_error_state();
1152
1153 private:
1154 // initialization state
1155 #ifdef ASSERT
1156 void set_init_state(ClassState state);
1157 #else
1158 void set_init_state(ClassState state) { _init_state = (u1)state; }
1159 #endif
1160 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1161 void set_init_thread(Thread *thread) { _init_thread = thread; }
1162
1163 // The RedefineClasses() API can cause new method idnums to be needed
1164 // which will cause the caches to grow. Safety requires different
1165 // cache management logic if the caches can grow instead of just
1166 // going from NULL to non-NULL.
1167 bool idnum_can_increment() const { return has_been_redefined(); }
1168 jmethodID* methods_jmethod_ids_acquire() const
1169 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1170 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1171 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1172
1173 // Lock during initialization
1174 public:
1175 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1176 // Must be one per class and it has to be a VM internal object so java code
1177 // cannot lock it (like the mirror).
1178 // It has to be an object not a Mutex because it's held through java calls.
1179 oop init_lock() const;
1180 private:
1181 void fence_and_clear_init_lock();
1182
1183 // Static methods that are used to implement member methods where an exposed this pointer
1184 // is needed due to possible GCs
1185 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1186 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1187 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1188 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1189 static void eager_initialize_impl (instanceKlassHandle this_k);
1190 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1191 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1192 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1193 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1194 /* jni_id_for_impl for jfieldID only */
1195 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1196
1197 // Returns the array class for the n'th dimension
1198 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1199
1200 // Returns the array class with this class as element type
1201 Klass* array_klass_impl(bool or_null, TRAPS);
1202
1203 // find a local method (returns NULL if not found)
1204 Method* find_method_impl(Symbol* name, Symbol* signature,
1205 OverpassLookupMode overpass_mode,
1206 StaticLookupMode static_mode,
1207 PrivateLookupMode private_mode) const;
1208 static Method* find_method_impl(Array<Method*>* methods,
1209 Symbol* name, Symbol* signature,
1210 OverpassLookupMode overpass_mode,
1211 StaticLookupMode static_mode,
1212 PrivateLookupMode private_mode);
1213
1214 // Free CHeap allocated fields.
1215 void release_C_heap_structures();
1216
1217 // RedefineClasses support
1218 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1219 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1220 public:
1221 // CDS support - remove and restore oops from metadata. Oops are not shared.
1222 virtual void remove_unshareable_info();
1223 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1224
1225 // jvm support
1226 jint compute_modifier_flags(TRAPS) const;
1227
1228 // JSR-292 support
1229 MemberNameTable* member_names() { return _member_names; }
1230 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1231 bool add_member_name(Handle member_name);
1232
1233 public:
1234 // JVMTI support
1235 jint jvmti_class_status() const;
1236
1237 public:
1238 // Printing
1239 #ifndef PRODUCT
1240 void print_on(outputStream* st) const;
1241 #endif
1242 void print_value_on(outputStream* st) const;
1243
1244 void oop_print_value_on(oop obj, outputStream* st);
1245
1246 #ifndef PRODUCT
1247 void oop_print_on (oop obj, outputStream* st);
1248
1249 void print_dependent_nmethods(bool verbose = false);
1250 bool is_dependent_nmethod(nmethod* nm);
1251 #endif
1252
1253 const char* internal_name() const;
1254
1255 // Verification
1256 void verify_on(outputStream* st);
1257
1258 void oop_verify_on(oop obj, outputStream* st);
1259 };
1260
1261 inline Method* InstanceKlass::method_at_vtable(int index) {
1262 #ifndef PRODUCT
1263 assert(index >= 0, "valid vtable index");
1264 if (DebugVtables) {
1265 verify_vtable_index(index);
1266 }
1267 #endif
1268 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1269 return ve[index].method();
1270 }
1271
1272 // for adding methods
1273 // UNSET_IDNUM return means no more ids available
1274 inline u2 InstanceKlass::next_method_idnum() {
1275 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1276 return ConstMethod::UNSET_IDNUM; // no more ids available
1277 } else {
1278 return _idnum_allocated_count++;
1279 }
1280 }
1281
1282
1283 /* JNIid class for jfieldIDs only */
1284 class JNIid: public CHeapObj<mtClass> {
1285 friend class VMStructs;
1286 private:
1287 Klass* _holder;
1288 JNIid* _next;
1289 int _offset;
1290 #ifdef ASSERT
1291 bool _is_static_field_id;
1292 #endif
1293
1294 public:
1295 // Accessors
1296 Klass* holder() const { return _holder; }
1297 int offset() const { return _offset; }
1298 JNIid* next() { return _next; }
1299 // Constructor
1300 JNIid(Klass* holder, int offset, JNIid* next);
1301 // Identifier lookup
1302 JNIid* find(int offset);
1303
1304 bool find_local_field(fieldDescriptor* fd) {
1305 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1306 }
1307
1308 static void deallocate(JNIid* id);
1309 // Debugging
1310 #ifdef ASSERT
1311 bool is_static_field_id() const { return _is_static_field_id; }
1312 void set_is_static_field_id() { _is_static_field_id = true; }
1313 #endif
1314 void verify(Klass* holder);
1315 };
1316
1317 // An iterator that's used to access the inner classes indices in the
1318 // InstanceKlass::_inner_classes array.
1319 class InnerClassesIterator : public StackObj {
1320 private:
1321 Array<jushort>* _inner_classes;
1322 int _length;
1323 int _idx;
1324 public:
1325
1326 InnerClassesIterator(instanceKlassHandle k) {
1327 _inner_classes = k->inner_classes();
1328 if (k->inner_classes() != NULL) {
1329 _length = _inner_classes->length();
1330 // The inner class array's length should be the multiple of
1331 // inner_class_next_offset if it only contains the InnerClasses
1332 // attribute data, or it should be
1333 // n*inner_class_next_offset+enclosing_method_attribute_size
1334 // if it also contains the EnclosingMethod data.
1335 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1336 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1337 "just checking");
1338 // Remove the enclosing_method portion if exists.
1339 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1340 _length -= InstanceKlass::enclosing_method_attribute_size;
1341 }
1342 } else {
1343 _length = 0;
1344 }
1345 _idx = 0;
1346 }
1347
1348 int length() const {
1349 return _length;
1350 }
1351
1352 void next() {
1353 _idx += InstanceKlass::inner_class_next_offset;
1354 }
1355
1356 bool done() const {
1357 return (_idx >= _length);
1358 }
1359
1360 u2 inner_class_info_index() const {
1361 return _inner_classes->at(
1362 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1363 }
1364
1365 void set_inner_class_info_index(u2 index) {
1366 _inner_classes->at_put(
1367 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1368 }
1369
1370 u2 outer_class_info_index() const {
1371 return _inner_classes->at(
1372 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1373 }
1374
1375 void set_outer_class_info_index(u2 index) {
1376 _inner_classes->at_put(
1377 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1378 }
1379
1380 u2 inner_name_index() const {
1381 return _inner_classes->at(
1382 _idx + InstanceKlass::inner_class_inner_name_offset);
1383 }
1384
1385 void set_inner_name_index(u2 index) {
1386 _inner_classes->at_put(
1387 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1388 }
1389
1390 u2 inner_access_flags() const {
1391 return _inner_classes->at(
1392 _idx + InstanceKlass::inner_class_access_flags_offset);
1393 }
1394 };
1395
1396 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP