1 /*
2 * Copyright (c) 1997, 2016, 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.
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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 ClassFileParser;
58 class DepChange;
59 class DependencyContext;
60 class fieldDescriptor;
61 class jniIdMapBase;
62 class JNIid;
63 class JvmtiCachedClassFieldMap;
64 class MemberNameTable;
65 class SuperTypeClosure;
66
67 // This is used in iterators below.
68 class FieldClosure: public StackObj {
69 public:
70 virtual void do_field(fieldDescriptor* fd) = 0;
71 };
72
73 #ifndef PRODUCT
74 // Print fields.
75 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
76 class FieldPrinter: public FieldClosure {
77 oop _obj;
78 outputStream* _st;
79 public:
80 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
81 void do_field(fieldDescriptor* fd);
82 };
83 #endif // !PRODUCT
84
85 // ValueObjs embedded in klass. Describes where oops are located in instances of
86 // this klass.
87 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
88 public:
89 // Byte offset of the first oop mapped by this block.
90 int offset() const { return _offset; }
91 void set_offset(int offset) { _offset = offset; }
92
93 // Number of oops in this block.
94 uint count() const { return _count; }
95 void set_count(uint count) { _count = count; }
96
97 // sizeof(OopMapBlock) in HeapWords.
98 static const int size_in_words() {
99 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
100 LogHeapWordSize;
101 }
102
103 private:
104 int _offset;
105 uint _count;
106 };
107
108 struct JvmtiCachedClassFileData;
109
110 class InstanceKlass: public Klass {
111 friend class VMStructs;
112 friend class JVMCIVMStructs;
113 friend class ClassFileParser;
114 friend class CompileReplay;
115
116 protected:
117 InstanceKlass(const ClassFileParser& parser, unsigned kind);
118
119 public:
120 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
121
122 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
123 // of the class loading & initialization procedure, and the use of the states.
124 enum ClassState {
125 allocated, // allocated (but not yet linked)
126 loaded, // loaded and inserted in class hierarchy (but not linked yet)
127 linked, // successfully linked/verified (but not initialized yet)
128 being_initialized, // currently running class initializer
129 fully_initialized, // initialized (successfull final state)
130 initialization_error // error happened during initialization
131 };
132
133 static int number_of_instance_classes() { return _total_instanceKlass_count; }
134
135 private:
136 static volatile int _total_instanceKlass_count;
137 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
138
139 protected:
140 // Annotations for this class
141 Annotations* _annotations;
142 // Array classes holding elements of this class.
143 Klass* _array_klasses;
144 // Constant pool for this class.
145 ConstantPool* _constants;
146 // The InnerClasses attribute and EnclosingMethod attribute. The
147 // _inner_classes is an array of shorts. If the class has InnerClasses
148 // attribute, then the _inner_classes array begins with 4-tuples of shorts
149 // [inner_class_info_index, outer_class_info_index,
150 // inner_name_index, inner_class_access_flags] for the InnerClasses
151 // attribute. If the EnclosingMethod attribute exists, it occupies the
152 // last two shorts [class_index, method_index] of the array. If only
153 // the InnerClasses attribute exists, the _inner_classes array length is
154 // number_of_inner_classes * 4. If the class has both InnerClasses
155 // and EnclosingMethod attributes the _inner_classes array length is
156 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
157 Array<jushort>* _inner_classes;
158
159 // the source debug extension for this klass, NULL if not specified.
160 // Specified as UTF-8 string without terminating zero byte in the classfile,
161 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
162 const char* _source_debug_extension;
163 // Array name derived from this class which needs unreferencing
164 // if this class is unloaded.
165 Symbol* _array_name;
166
167 // Number of heapOopSize words used by non-static fields in this klass
168 // (including inherited fields but after header_size()).
169 int _nonstatic_field_size;
170 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
171 // Constant pool index to the utf8 entry of the Generic signature,
172 // or 0 if none.
173 u2 _generic_signature_index;
174 // Constant pool index to the utf8 entry for the name of source file
175 // containing this klass, 0 if not specified.
176 u2 _source_file_name_index;
177 u2 _static_oop_field_count;// number of static oop fields in this klass
178 u2 _java_fields_count; // The number of declared Java fields
179 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
180
181 int _itable_len; // length of Java itable (in words)
182 // _is_marked_dependent can be set concurrently, thus cannot be part of the
183 // _misc_flags.
184 bool _is_marked_dependent; // used for marking during flushing and deoptimization
185
186 // The low two bits of _misc_flags contains the kind field.
187 // This can be used to quickly discriminate among the four kinds of
188 // InstanceKlass.
189
190 static const unsigned _misc_kind_field_size = 2;
191 static const unsigned _misc_kind_field_pos = 0;
192 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
193
194 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
195 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
196 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
197 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
198
199 // Start after _misc_kind field.
200 enum {
201 _misc_rewritten = 1 << 2, // methods rewritten.
202 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
203 _misc_should_verify_class = 1 << 4, // allow caching of preverification
204 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
205 _misc_is_contended = 1 << 6, // marked with contended annotation
206 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods
207 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
208 _misc_has_been_redefined = 1 << 9, // class has been redefined
209 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class
210 };
211 u2 _misc_flags;
212 u2 _minor_version; // minor version number of class file
213 u2 _major_version; // major version number of class file
214 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
215 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
216 MemberNameTable* _member_names; // Member names
217 JNIid* _jni_ids; // First JNI identifier for static fields in this class
218 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
219 intptr_t _dep_context; // packed DependencyContext structure
220 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
221 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
222 // Linked instanceKlasses of previous versions
223 InstanceKlass* _previous_versions;
224 // JVMTI fields can be moved to their own structure - see 6315920
225 // JVMTI: cached class file, before retransformable agent modified it in CFLH
226 JvmtiCachedClassFileData* _cached_class_file;
227
228 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
229
230 // Class states are defined as ClassState (see above).
231 // Place the _init_state here to utilize the unused 2-byte after
232 // _idnum_allocated_count.
233 u1 _init_state; // state of class
234 u1 _reference_type; // reference type
235
236 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
237
238 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
239
240 // Method array.
241 Array<Method*>* _methods;
242 // Default Method Array, concrete methods inherited from interfaces
243 Array<Method*>* _default_methods;
244 // Interface (Klass*s) this class declares locally to implement.
245 Array<Klass*>* _local_interfaces;
246 // Interface (Klass*s) this class implements transitively.
247 Array<Klass*>* _transitive_interfaces;
248 // Int array containing the original order of method in the class file (for JVMTI).
249 Array<int>* _method_ordering;
250 // Int array containing the vtable_indices for default_methods
251 // offset matches _default_methods offset
252 Array<int>* _default_vtable_indices;
253
254 // Instance and static variable information, starts with 6-tuples of shorts
255 // [access, name index, sig index, initval index, low_offset, high_offset]
256 // for all fields, followed by the generic signature data at the end of
257 // the array. Only fields with generic signature attributes have the generic
258 // signature data set in the array. The fields array looks like following:
259 //
260 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
261 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
262 // ...
263 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
264 // [generic signature index]
265 // [generic signature index]
266 // ...
267 Array<u2>* _fields;
268
269 // embedded Java vtable follows here
270 // embedded Java itables follows here
271 // embedded static fields follows here
272 // embedded nonstatic oop-map blocks follows here
273 // embedded implementor of this interface follows here
274 // The embedded implementor only exists if the current klass is an
275 // iterface. The possible values of the implementor fall into following
276 // three cases:
277 // NULL: no implementor.
278 // A Klass* that's not itself: one implementor.
279 // Itself: more than one implementors.
280 // embedded host klass follows here
281 // The embedded host klass only exists in an anonymous class for
282 // dynamic language support (JSR 292 enabled). The host class grants
283 // its access privileges to this class also. The host class is either
284 // named, or a previously loaded anonymous class. A non-anonymous class
285 // or an anonymous class loaded through normal classloading does not
286 // have this embedded field.
287 //
288
289 friend class SystemDictionary;
290
291 public:
292 bool has_nonstatic_fields() const {
293 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
294 }
295 void set_has_nonstatic_fields(bool b) {
296 if (b) {
297 _misc_flags |= _misc_has_nonstatic_fields;
298 } else {
299 _misc_flags &= ~_misc_has_nonstatic_fields;
300 }
301 }
302
303 // field sizes
304 int nonstatic_field_size() const { return _nonstatic_field_size; }
305 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
306
307 int static_field_size() const { return _static_field_size; }
308 void set_static_field_size(int size) { _static_field_size = size; }
309
310 int static_oop_field_count() const { return (int)_static_oop_field_count; }
311 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
312
313 // Java itable
314 int itable_length() const { return _itable_len; }
315 void set_itable_length(int len) { _itable_len = len; }
316
317 // array klasses
318 Klass* array_klasses() const { return _array_klasses; }
319 void set_array_klasses(Klass* k) { _array_klasses = k; }
320
321 // methods
322 Array<Method*>* methods() const { return _methods; }
323 void set_methods(Array<Method*>* a) { _methods = a; }
324 Method* method_with_idnum(int idnum);
325 Method* method_with_orig_idnum(int idnum);
326 Method* method_with_orig_idnum(int idnum, int version);
327
328 // method ordering
329 Array<int>* method_ordering() const { return _method_ordering; }
330 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
331 void copy_method_ordering(const intArray* m, TRAPS);
332
333 // default_methods
334 Array<Method*>* default_methods() const { return _default_methods; }
335 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
336
337 // default method vtable_indices
338 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
339 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
340 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
341
342 // interfaces
343 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
344 void set_local_interfaces(Array<Klass*>* a) {
345 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
346 _local_interfaces = a; }
347
348 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
349 void set_transitive_interfaces(Array<Klass*>* a) {
350 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
351 _transitive_interfaces = a;
352 }
353
354 private:
355 friend class fieldDescriptor;
356 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
357
358 public:
359 int field_offset (int index) const { return field(index)->offset(); }
360 int field_access_flags(int index) const { return field(index)->access_flags(); }
361 Symbol* field_name (int index) const { return field(index)->name(constants()); }
362 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
363
364 // Number of Java declared fields
365 int java_fields_count() const { return (int)_java_fields_count; }
366
367 Array<u2>* fields() const { return _fields; }
368 void set_fields(Array<u2>* f, u2 java_fields_count) {
369 guarantee(_fields == NULL || f == NULL, "Just checking");
370 _fields = f;
371 _java_fields_count = java_fields_count;
372 }
373
374 // inner classes
375 Array<u2>* inner_classes() const { return _inner_classes; }
376 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
377
378 enum InnerClassAttributeOffset {
379 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
380 inner_class_inner_class_info_offset = 0,
381 inner_class_outer_class_info_offset = 1,
382 inner_class_inner_name_offset = 2,
383 inner_class_access_flags_offset = 3,
384 inner_class_next_offset = 4
385 };
386
387 enum EnclosingMethodAttributeOffset {
388 enclosing_method_class_index_offset = 0,
389 enclosing_method_method_index_offset = 1,
390 enclosing_method_attribute_size = 2
391 };
392
393 // method override check
394 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
395
396 // package
397 bool is_same_class_package(const Klass* class2) const;
398 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
399 static bool is_same_class_package(oop class_loader1,
400 const Symbol* class_name1,
401 oop class_loader2,
402 const Symbol* class_name2);
403
404 // find an enclosing class
405 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const {
406 return compute_enclosing_class_impl(this, inner_is_member, THREAD);
407 }
408 static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self,
409 bool* inner_is_member,
410 TRAPS);
411
412 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
413 static bool find_inner_classes_attr(instanceKlassHandle k,
414 int* ooff, int* noff, TRAPS);
415
416 // tell if two classes have the same enclosing class (at package level)
417 bool is_same_package_member(const Klass* class2, TRAPS) const {
418 return is_same_package_member_impl(this, class2, THREAD);
419 }
420 static bool is_same_package_member_impl(const InstanceKlass* self,
421 const Klass* class2,
422 TRAPS);
423
424 // initialization state
425 bool is_loaded() const { return _init_state >= loaded; }
426 bool is_linked() const { return _init_state >= linked; }
427 bool is_initialized() const { return _init_state == fully_initialized; }
428 bool is_not_initialized() const { return _init_state < being_initialized; }
429 bool is_being_initialized() const { return _init_state == being_initialized; }
430 bool is_in_error_state() const { return _init_state == initialization_error; }
431 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
432 ClassState init_state() { return (ClassState)_init_state; }
433 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
434
435 // defineClass specified verification
436 bool should_verify_class() const {
437 return (_misc_flags & _misc_should_verify_class) != 0;
438 }
439 void set_should_verify_class(bool value) {
440 if (value) {
441 _misc_flags |= _misc_should_verify_class;
442 } else {
443 _misc_flags &= ~_misc_should_verify_class;
444 }
445 }
446
447 // marking
448 bool is_marked_dependent() const { return _is_marked_dependent; }
449 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
450
451 // initialization (virtuals from Klass)
452 bool should_be_initialized() const; // means that initialize should be called
453 void initialize(TRAPS);
454 void link_class(TRAPS);
455 bool link_class_or_fail(TRAPS); // returns false on failure
456 void unlink_class();
457 void rewrite_class(TRAPS);
458 void link_methods(TRAPS);
459 Method* class_initializer();
460
461 // set the class to initialized if no static initializer is present
462 void eager_initialize(Thread *thread);
463
464 // reference type
465 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
466 void set_reference_type(ReferenceType t) {
467 assert(t == (u1)t, "overflow");
468 _reference_type = (u1)t;
469 }
470
471 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
472
473 // find local field, returns true if found
474 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
475 // find field in direct superinterfaces, returns the interface in which the field is defined
476 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
477 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
478 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
479 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
480 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
481
482 // find a non-static or static field given its offset within the class.
483 bool contains_field_offset(int offset) {
484 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
485 }
486
487 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
488 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
489
490 // find a local method (returns NULL if not found)
491 Method* find_method(const Symbol* name, const Symbol* signature) const;
492 static Method* find_method(const Array<Method*>* methods,
493 const Symbol* name,
494 const Symbol* signature);
495
496 // find a local method, but skip static methods
497 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
498 static Method* find_instance_method(const Array<Method*>* methods,
499 const Symbol* name,
500 const Symbol* signature);
501
502 // find a local method (returns NULL if not found)
503 Method* find_local_method(const Symbol* name,
504 const Symbol* signature,
505 OverpassLookupMode overpass_mode,
506 StaticLookupMode static_mode,
507 PrivateLookupMode private_mode) const;
508
509 // find a local method from given methods array (returns NULL if not found)
510 static Method* find_local_method(const Array<Method*>* methods,
511 const Symbol* name,
512 const Symbol* signature,
513 OverpassLookupMode overpass_mode,
514 StaticLookupMode static_mode,
515 PrivateLookupMode private_mode);
516
517 // find a local method index in methods or default_methods (returns -1 if not found)
518 static int find_method_index(const Array<Method*>* methods,
519 const Symbol* name,
520 const Symbol* signature,
521 OverpassLookupMode overpass_mode,
522 StaticLookupMode static_mode,
523 PrivateLookupMode private_mode);
524
525 // lookup operation (returns NULL if not found)
526 Method* uncached_lookup_method(const Symbol* name,
527 const Symbol* signature,
528 OverpassLookupMode overpass_mode) const;
529
530 // lookup a method in all the interfaces that this class implements
531 // (returns NULL if not found)
532 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
533
534 // lookup a method in local defaults then in all interfaces
535 // (returns NULL if not found)
536 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
537
538 // Find method indices by name. If a method with the specified name is
539 // found the index to the first method is returned, and 'end' is filled in
540 // with the index of first non-name-matching method. If no method is found
541 // -1 is returned.
542 int find_method_by_name(const Symbol* name, int* end) const;
543 static int find_method_by_name(const Array<Method*>* methods,
544 const Symbol* name, int* end);
545
546 // constant pool
547 ConstantPool* constants() const { return _constants; }
548 void set_constants(ConstantPool* c) { _constants = c; }
549
550 // protection domain
551 oop protection_domain() const;
552
553 // signers
554 objArrayOop signers() const;
555
556 // host class
557 Klass* host_klass() const {
558 Klass** hk = (Klass**)adr_host_klass();
559 if (hk == NULL) {
560 return NULL;
561 } else {
562 assert(*hk != NULL, "host klass should always be set if the address is not null");
563 return *hk;
564 }
565 }
566 void set_host_klass(const Klass* host) {
567 assert(is_anonymous(), "not anonymous");
568 const Klass** addr = (const Klass**)adr_host_klass();
569 assert(addr != NULL, "no reversed space");
570 if (addr != NULL) {
571 *addr = host;
572 }
573 }
574 bool is_anonymous() const {
575 return (_misc_flags & _misc_is_anonymous) != 0;
576 }
577 void set_is_anonymous(bool value) {
578 if (value) {
579 _misc_flags |= _misc_is_anonymous;
580 } else {
581 _misc_flags &= ~_misc_is_anonymous;
582 }
583 }
584
585 // Oop that keeps the metadata for this class from being unloaded
586 // in places where the metadata is stored in other places, like nmethods
587 oop klass_holder() const {
588 return is_anonymous() ? java_mirror() : class_loader();
589 }
590
591 bool is_contended() const {
592 return (_misc_flags & _misc_is_contended) != 0;
593 }
594 void set_is_contended(bool value) {
595 if (value) {
596 _misc_flags |= _misc_is_contended;
597 } else {
598 _misc_flags &= ~_misc_is_contended;
599 }
600 }
601
602 // source file name
603 Symbol* source_file_name() const {
604 return (_source_file_name_index == 0) ?
605 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
606 }
607 u2 source_file_name_index() const {
608 return _source_file_name_index;
609 }
610 void set_source_file_name_index(u2 sourcefile_index) {
611 _source_file_name_index = sourcefile_index;
612 }
613
614 // minor and major version numbers of class file
615 u2 minor_version() const { return _minor_version; }
616 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
617 u2 major_version() const { return _major_version; }
618 void set_major_version(u2 major_version) { _major_version = major_version; }
619
620 // source debug extension
621 const char* source_debug_extension() const { return _source_debug_extension; }
622 void set_source_debug_extension(const char* array, int length);
623
624 // symbol unloading support (refcount already added)
625 Symbol* array_name() { return _array_name; }
626 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
627
628 // nonstatic oop-map blocks
629 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
630 return oop_map_count * OopMapBlock::size_in_words();
631 }
632 unsigned int nonstatic_oop_map_count() const {
633 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
634 }
635 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
636 void set_nonstatic_oop_map_size(int words) {
637 _nonstatic_oop_map_size = words;
638 }
639
640 // RedefineClasses() support for previous versions:
641 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
642
643 InstanceKlass* previous_versions() const { return _previous_versions; }
644
645 InstanceKlass* get_klass_version(int version) {
646 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
647 if (ik->constants()->version() == version) {
648 return ik;
649 }
650 }
651 return NULL;
652 }
653
654 bool has_been_redefined() const {
655 return (_misc_flags & _misc_has_been_redefined) != 0;
656 }
657 void set_has_been_redefined() {
658 _misc_flags |= _misc_has_been_redefined;
659 }
660
661 bool is_scratch_class() const {
662 return (_misc_flags & _misc_is_scratch_class) != 0;
663 }
664
665 void set_is_scratch_class() {
666 _misc_flags |= _misc_is_scratch_class;
667 }
668
669 private:
670
671 void set_kind(unsigned kind) {
672 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
673 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
674 unsigned flags = _misc_flags & ~fmask;
675 _misc_flags = (flags | (kind << _misc_kind_field_pos));
676 }
677
678 bool is_kind(unsigned desired) const {
679 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
680 return kind == desired;
681 }
682
683 public:
684
685 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
686 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
687 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
688 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
689 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
690
691 void init_previous_versions() {
692 _previous_versions = NULL;
693 }
694
695 private:
696 static int _previous_version_count;
697 public:
698 static void purge_previous_versions(InstanceKlass* ik);
699 static bool has_previous_versions() { return _previous_version_count > 0; }
700
701 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
702 void set_cached_class_file(JvmtiCachedClassFileData *data) {
703 _cached_class_file = data;
704 }
705 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
706 jint get_cached_class_file_len();
707 unsigned char * get_cached_class_file_bytes();
708
709 // JVMTI: Support for caching of field indices, types, and offsets
710 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
711 _jvmti_cached_class_field_map = descriptor;
712 }
713 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
714 return _jvmti_cached_class_field_map;
715 }
716
717 bool has_default_methods() const {
718 return (_misc_flags & _misc_has_default_methods) != 0;
719 }
720 void set_has_default_methods(bool b) {
721 if (b) {
722 _misc_flags |= _misc_has_default_methods;
723 } else {
724 _misc_flags &= ~_misc_has_default_methods;
725 }
726 }
727
728 bool declares_default_methods() const {
729 return (_misc_flags & _misc_declares_default_methods) != 0;
730 }
731 void set_declares_default_methods(bool b) {
732 if (b) {
733 _misc_flags |= _misc_declares_default_methods;
734 } else {
735 _misc_flags &= ~_misc_declares_default_methods;
736 }
737 }
738
739 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
740 inline u2 next_method_idnum();
741 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
742
743 // generics support
744 Symbol* generic_signature() const {
745 return (_generic_signature_index == 0) ?
746 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
747 }
748 u2 generic_signature_index() const {
749 return _generic_signature_index;
750 }
751 void set_generic_signature_index(u2 sig_index) {
752 _generic_signature_index = sig_index;
753 }
754
755 u2 enclosing_method_data(int offset) const;
756 u2 enclosing_method_class_index() const {
757 return enclosing_method_data(enclosing_method_class_index_offset);
758 }
759 u2 enclosing_method_method_index() {
760 return enclosing_method_data(enclosing_method_method_index_offset);
761 }
762 void set_enclosing_method_indices(u2 class_index,
763 u2 method_index);
764
765 // jmethodID support
766 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
767 const methodHandle& method_h);
768 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
769 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
770 jmethodID* to_dealloc_id_p,
771 jmethodID** to_dealloc_jmeths_p);
772 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
773 size_t *length_p, jmethodID* id_p);
774 void ensure_space_for_methodids(int start_offset = 0);
775 jmethodID jmethod_id_or_null(Method* method);
776
777 // annotations support
778 Annotations* annotations() const { return _annotations; }
779 void set_annotations(Annotations* anno) { _annotations = anno; }
780
781 AnnotationArray* class_annotations() const {
782 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
783 }
784 Array<AnnotationArray*>* fields_annotations() const {
785 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
786 }
787 AnnotationArray* class_type_annotations() const {
788 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
789 }
790 Array<AnnotationArray*>* fields_type_annotations() const {
791 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
792 }
793 // allocation
794 instanceOop allocate_instance(TRAPS);
795
796 // additional member function to return a handle
797 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
798
799 objArrayOop allocate_objArray(int n, int length, TRAPS);
800 // Helper function
801 static instanceOop register_finalizer(instanceOop i, TRAPS);
802
803 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
804 // if not, throw either an Error or an Exception.
805 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
806
807 // initialization
808 void call_class_initializer(TRAPS);
809 void set_initialization_state_and_notify(ClassState state, TRAPS);
810
811 // OopMapCache support
812 OopMapCache* oop_map_cache() { return _oop_map_cache; }
813 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
814 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
815
816 // JNI identifier support (for static fields - for jni performance)
817 JNIid* jni_ids() { return _jni_ids; }
818 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
819 JNIid* jni_id_for(int offset);
820
821 // maintenance of deoptimization dependencies
822 inline DependencyContext dependencies();
823 int mark_dependent_nmethods(DepChange& changes);
824 void add_dependent_nmethod(nmethod* nm);
825 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
826
827 // On-stack replacement support
828 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
829 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
830 void add_osr_nmethod(nmethod* n);
831 void remove_osr_nmethod(nmethod* n);
832 int mark_osr_nmethods(const Method* m);
833 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
834
835 // Breakpoint support (see methods on Method* for details)
836 BreakpointInfo* breakpoints() const { return _breakpoints; };
837 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
838
839 // support for stub routines
840 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
841 TRACE_DEFINE_OFFSET;
842 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
843
844 // subclass/subinterface checks
845 bool implements_interface(Klass* k) const;
846 bool is_same_or_direct_interface(Klass* k) const;
847
848 #ifdef ASSERT
849 // check whether this class or one of its superclasses was redefined
850 bool has_redefined_this_or_super() const;
851 #endif
852
853 // Access to the implementor of an interface.
854 Klass* implementor() const
855 {
856 Klass** k = adr_implementor();
857 if (k == NULL) {
858 return NULL;
859 } else {
860 return *k;
861 }
862 }
863
864 void set_implementor(Klass* k) {
865 assert(is_interface(), "not interface");
866 Klass** addr = adr_implementor();
867 assert(addr != NULL, "null addr");
868 if (addr != NULL) {
869 *addr = k;
870 }
871 }
872
873 int nof_implementors() const {
874 Klass* k = implementor();
875 if (k == NULL) {
876 return 0;
877 } else if (k != this) {
878 return 1;
879 } else {
880 return 2;
881 }
882 }
883
884 void add_implementor(Klass* k); // k is a new class that implements this interface
885 void init_implementor(); // initialize
886
887 // link this class into the implementors list of every interface it implements
888 void process_interfaces(Thread *thread);
889
890 // virtual operations from Klass
891 bool is_leaf_class() const { return _subklass == NULL; }
892 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
893 bool compute_is_subtype_of(Klass* k);
894 bool can_be_primary_super_slow() const;
895 int oop_size(oop obj) const { return size_helper(); }
896 // slow because it's a virtual call and used for verifying the layout_helper.
897 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
898 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
899
900 // Iterators
901 void do_local_static_fields(FieldClosure* cl);
902 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
903 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
904
905 void methods_do(void f(Method* method));
906 void array_klasses_do(void f(Klass* k));
907 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
908 bool super_types_do(SuperTypeClosure* blk);
909
910 static InstanceKlass* cast(Klass* k) {
911 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
912 }
913
914 static const InstanceKlass* cast(const Klass* k) {
915 assert(k != NULL, "k should not be null");
916 assert(k->is_instance_klass(), "cast to InstanceKlass");
917 return static_cast<const InstanceKlass*>(k);
918 }
919
920 InstanceKlass* java_super() const {
921 return (super() == NULL) ? NULL : cast(super());
922 }
923
924 // Sizing (in words)
925 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
926
927 static int size(int vtable_length, int itable_length,
928 int nonstatic_oop_map_size,
929 bool is_interface, bool is_anonymous) {
930 return align_object_size(header_size() +
931 align_object_offset(vtable_length) +
932 align_object_offset(itable_length) +
933 ((is_interface || is_anonymous) ?
934 align_object_offset(nonstatic_oop_map_size) :
935 nonstatic_oop_map_size) +
936 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
937 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
938 }
939 int size() const { return size(vtable_length(),
940 itable_length(),
941 nonstatic_oop_map_size(),
942 is_interface(),
943 is_anonymous());
944 }
945 #if INCLUDE_SERVICES
946 virtual void collect_statistics(KlassSizeStats *sz) const;
947 #endif
948
949 intptr_t* start_of_vtable() const { return (intptr_t*) ((address)this + in_bytes(vtable_start_offset())); }
950 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
951 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
952
953 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
954
955 address static_field_addr(int offset);
956
957 OopMapBlock* start_of_nonstatic_oop_maps() const {
958 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
959 }
960
961 Klass** end_of_nonstatic_oop_maps() const {
962 return (Klass**)(start_of_nonstatic_oop_maps() +
963 nonstatic_oop_map_count());
964 }
965
966 Klass** adr_implementor() const {
967 if (is_interface()) {
968 return (Klass**)end_of_nonstatic_oop_maps();
969 } else {
970 return NULL;
971 }
972 };
973
974 Klass** adr_host_klass() const {
975 if (is_anonymous()) {
976 Klass** adr_impl = adr_implementor();
977 if (adr_impl != NULL) {
978 return adr_impl + 1;
979 } else {
980 return end_of_nonstatic_oop_maps();
981 }
982 } else {
983 return NULL;
984 }
985 }
986
987 // Use this to return the size of an instance in heap words:
988 int size_helper() const {
989 return layout_helper_to_size_helper(layout_helper());
990 }
991
992 // This bit is initialized in classFileParser.cpp.
993 // It is false under any of the following conditions:
994 // - the class is abstract (including any interface)
995 // - the class has a finalizer (if !RegisterFinalizersAtInit)
996 // - the class size is larger than FastAllocateSizeLimit
997 // - the class is java/lang/Class, which cannot be allocated directly
998 bool can_be_fastpath_allocated() const {
999 return !layout_helper_needs_slow_path(layout_helper());
1000 }
1001
1002 // Java vtable/itable
1003 klassVtable* vtable() const; // return new klassVtable wrapper
1004 inline Method* method_at_vtable(int index);
1005 klassItable* itable() const; // return new klassItable wrapper
1006 Method* method_at_itable(Klass* holder, int index, TRAPS);
1007
1008 #if INCLUDE_JVMTI
1009 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1010 #endif // INCLUDE_JVMTI
1011
1012 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1013 void clean_implementors_list(BoolObjectClosure* is_alive);
1014 void clean_method_data(BoolObjectClosure* is_alive);
1015
1016 // Explicit metaspace deallocation of fields
1017 // For RedefineClasses and class file parsing errors, we need to deallocate
1018 // instanceKlasses and the metadata they point to.
1019 void deallocate_contents(ClassLoaderData* loader_data);
1020 static void deallocate_methods(ClassLoaderData* loader_data,
1021 Array<Method*>* methods);
1022 void static deallocate_interfaces(ClassLoaderData* loader_data,
1023 const Klass* super_klass,
1024 Array<Klass*>* local_interfaces,
1025 Array<Klass*>* transitive_interfaces);
1026
1027 // The constant pool is on stack if any of the methods are executing or
1028 // referenced by handles.
1029 bool on_stack() const { return _constants->on_stack(); }
1030
1031 // callbacks for actions during class unloading
1032 static void notify_unload_class(InstanceKlass* ik);
1033 static void release_C_heap_structures(InstanceKlass* ik);
1034
1035 // Naming
1036 const char* signature_name() const;
1037
1038 // GC specific object visitors
1039 //
1040 // Mark Sweep
1041 int oop_ms_adjust_pointers(oop obj);
1042 #if INCLUDE_ALL_GCS
1043 // Parallel Scavenge
1044 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1045 // Parallel Compact
1046 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1047 void oop_pc_update_pointers(oop obj);
1048 #endif
1049
1050 // Oop fields (and metadata) iterators
1051 // [nv = true] Use non-virtual calls to do_oop_nv.
1052 // [nv = false] Use virtual calls to do_oop.
1053 //
1054 // The InstanceKlass iterators also visits the Object's klass.
1055
1056 // Forward iteration
1057 public:
1058 // Iterate over all oop fields in the oop maps.
1059 template <bool nv, class OopClosureType>
1060 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1061
1062 protected:
1063 // Iterate over all oop fields and metadata.
1064 template <bool nv, class OopClosureType>
1065 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1066
1067 private:
1068 // Iterate over all oop fields in the oop maps.
1069 // Specialized for [T = oop] or [T = narrowOop].
1070 template <bool nv, typename T, class OopClosureType>
1071 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1072
1073 // Iterate over all oop fields in one oop map.
1074 template <bool nv, typename T, class OopClosureType>
1075 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1076
1077
1078 // Reverse iteration
1079 #if INCLUDE_ALL_GCS
1080 public:
1081 // Iterate over all oop fields in the oop maps.
1082 template <bool nv, class OopClosureType>
1083 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1084
1085 protected:
1086 // Iterate over all oop fields and metadata.
1087 template <bool nv, class OopClosureType>
1088 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1089
1090 private:
1091 // Iterate over all oop fields in the oop maps.
1092 // Specialized for [T = oop] or [T = narrowOop].
1093 template <bool nv, typename T, class OopClosureType>
1094 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1095
1096 // Iterate over all oop fields in one oop map.
1097 template <bool nv, typename T, class OopClosureType>
1098 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1099 #endif
1100
1101
1102 // Bounded range iteration
1103 public:
1104 // Iterate over all oop fields in the oop maps.
1105 template <bool nv, class OopClosureType>
1106 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1107
1108 protected:
1109 // Iterate over all oop fields and metadata.
1110 template <bool nv, class OopClosureType>
1111 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1112
1113 private:
1114 // Iterate over all oop fields in the oop maps.
1115 // Specialized for [T = oop] or [T = narrowOop].
1116 template <bool nv, typename T, class OopClosureType>
1117 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1118
1119 // Iterate over all oop fields in one oop map.
1120 template <bool nv, typename T, class OopClosureType>
1121 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1122
1123
1124 public:
1125
1126 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1127 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1128
1129 #if INCLUDE_ALL_GCS
1130 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1131 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1132 #endif // INCLUDE_ALL_GCS
1133
1134 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1135
1136 public:
1137 void set_in_error_state() {
1138 assert(DumpSharedSpaces, "only call this when dumping archive");
1139 _init_state = initialization_error;
1140 }
1141 bool check_sharing_error_state();
1142
1143 private:
1144 // initialization state
1145 #ifdef ASSERT
1146 void set_init_state(ClassState state);
1147 #else
1148 void set_init_state(ClassState state) { _init_state = (u1)state; }
1149 #endif
1150 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1151 void set_init_thread(Thread *thread) { _init_thread = thread; }
1152
1153 // The RedefineClasses() API can cause new method idnums to be needed
1154 // which will cause the caches to grow. Safety requires different
1155 // cache management logic if the caches can grow instead of just
1156 // going from NULL to non-NULL.
1157 bool idnum_can_increment() const { return has_been_redefined(); }
1158 jmethodID* methods_jmethod_ids_acquire() const
1159 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1160 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1161 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1162
1163 // Lock during initialization
1164 public:
1165 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1166 // Must be one per class and it has to be a VM internal object so java code
1167 // cannot lock it (like the mirror).
1168 // It has to be an object not a Mutex because it's held through java calls.
1169 oop init_lock() const;
1170 private:
1171 void fence_and_clear_init_lock();
1172
1173 // Static methods that are used to implement member methods where an exposed this pointer
1174 // is needed due to possible GCs
1175 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1176 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1177 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1178 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1179 static void eager_initialize_impl (instanceKlassHandle this_k);
1180 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1181 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1182 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1183 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1184 /* jni_id_for_impl for jfieldID only */
1185 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1186
1187 // Returns the array class for the n'th dimension
1188 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1189
1190 // Returns the array class with this class as element type
1191 Klass* array_klass_impl(bool or_null, TRAPS);
1192
1193 // find a local method (returns NULL if not found)
1194 Method* find_method_impl(const Symbol* name,
1195 const Symbol* signature,
1196 OverpassLookupMode overpass_mode,
1197 StaticLookupMode static_mode,
1198 PrivateLookupMode private_mode) const;
1199
1200 static Method* find_method_impl(const Array<Method*>* methods,
1201 const Symbol* name,
1202 const Symbol* signature,
1203 OverpassLookupMode overpass_mode,
1204 StaticLookupMode static_mode,
1205 PrivateLookupMode private_mode);
1206
1207 // Free CHeap allocated fields.
1208 void release_C_heap_structures();
1209
1210 // RedefineClasses support
1211 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1212 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1213 public:
1214 // CDS support - remove and restore oops from metadata. Oops are not shared.
1215 virtual void remove_unshareable_info();
1216 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1217
1218 // jvm support
1219 jint compute_modifier_flags(TRAPS) const;
1220
1221 // JSR-292 support
1222 MemberNameTable* member_names() { return _member_names; }
1223 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1224 bool add_member_name(Handle member_name);
1225
1226 public:
1227 // JVMTI support
1228 jint jvmti_class_status() const;
1229
1230 public:
1231 // Printing
1232 #ifndef PRODUCT
1233 void print_on(outputStream* st) const;
1234 #endif
1235 void print_value_on(outputStream* st) const;
1236
1237 void oop_print_value_on(oop obj, outputStream* st);
1238
1239 #ifndef PRODUCT
1240 void oop_print_on (oop obj, outputStream* st);
1241
1242 void print_dependent_nmethods(bool verbose = false);
1243 bool is_dependent_nmethod(nmethod* nm);
1244 #endif
1245
1246 const char* internal_name() const;
1247
1248 // Verification
1249 void verify_on(outputStream* st);
1250
1251 void oop_verify_on(oop obj, outputStream* st);
1252 };
1253
1254 inline Method* InstanceKlass::method_at_vtable(int index) {
1255 #ifndef PRODUCT
1256 assert(index >= 0, "valid vtable index");
1257 if (DebugVtables) {
1258 verify_vtable_index(index);
1259 }
1260 #endif
1261 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1262 return ve[index].method();
1263 }
1264
1265 // for adding methods
1266 // UNSET_IDNUM return means no more ids available
1267 inline u2 InstanceKlass::next_method_idnum() {
1268 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1269 return ConstMethod::UNSET_IDNUM; // no more ids available
1270 } else {
1271 return _idnum_allocated_count++;
1272 }
1273 }
1274
1275
1276 /* JNIid class for jfieldIDs only */
1277 class JNIid: public CHeapObj<mtClass> {
1278 friend class VMStructs;
1279 private:
1280 Klass* _holder;
1281 JNIid* _next;
1282 int _offset;
1283 #ifdef ASSERT
1284 bool _is_static_field_id;
1285 #endif
1286
1287 public:
1288 // Accessors
1289 Klass* holder() const { return _holder; }
1290 int offset() const { return _offset; }
1291 JNIid* next() { return _next; }
1292 // Constructor
1293 JNIid(Klass* holder, int offset, JNIid* next);
1294 // Identifier lookup
1295 JNIid* find(int offset);
1296
1297 bool find_local_field(fieldDescriptor* fd) {
1298 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1299 }
1300
1301 static void deallocate(JNIid* id);
1302 // Debugging
1303 #ifdef ASSERT
1304 bool is_static_field_id() const { return _is_static_field_id; }
1305 void set_is_static_field_id() { _is_static_field_id = true; }
1306 #endif
1307 void verify(Klass* holder);
1308 };
1309
1310 // An iterator that's used to access the inner classes indices in the
1311 // InstanceKlass::_inner_classes array.
1312 class InnerClassesIterator : public StackObj {
1313 private:
1314 Array<jushort>* _inner_classes;
1315 int _length;
1316 int _idx;
1317 public:
1318
1319 InnerClassesIterator(instanceKlassHandle k) {
1320 _inner_classes = k->inner_classes();
1321 if (k->inner_classes() != NULL) {
1322 _length = _inner_classes->length();
1323 // The inner class array's length should be the multiple of
1324 // inner_class_next_offset if it only contains the InnerClasses
1325 // attribute data, or it should be
1326 // n*inner_class_next_offset+enclosing_method_attribute_size
1327 // if it also contains the EnclosingMethod data.
1328 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1329 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1330 "just checking");
1331 // Remove the enclosing_method portion if exists.
1332 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1333 _length -= InstanceKlass::enclosing_method_attribute_size;
1334 }
1335 } else {
1336 _length = 0;
1337 }
1338 _idx = 0;
1339 }
1340
1341 int length() const {
1342 return _length;
1343 }
1344
1345 void next() {
1346 _idx += InstanceKlass::inner_class_next_offset;
1347 }
1348
1349 bool done() const {
1350 return (_idx >= _length);
1351 }
1352
1353 u2 inner_class_info_index() const {
1354 return _inner_classes->at(
1355 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1356 }
1357
1358 void set_inner_class_info_index(u2 index) {
1359 _inner_classes->at_put(
1360 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1361 }
1362
1363 u2 outer_class_info_index() const {
1364 return _inner_classes->at(
1365 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1366 }
1367
1368 void set_outer_class_info_index(u2 index) {
1369 _inner_classes->at_put(
1370 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1371 }
1372
1373 u2 inner_name_index() const {
1374 return _inner_classes->at(
1375 _idx + InstanceKlass::inner_class_inner_name_offset);
1376 }
1377
1378 void set_inner_name_index(u2 index) {
1379 _inner_classes->at_put(
1380 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1381 }
1382
1383 u2 inner_access_flags() const {
1384 return _inner_classes->at(
1385 _idx + InstanceKlass::inner_class_access_flags_offset);
1386 }
1387 };
1388
1389 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP