Fri, 20 Sep 2013 09:30:02 -0400
8022887: Assertion hit while using class and redefining it with RedefineClasses simultaneously
Summary: Need to refetch each method from InstanceKlass after all safepoints. Removed leaky PreviousVersionInfo code.
Reviewed-by: dcubed, sspitsyn
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
28 #include "classfile/classLoaderData.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceOop.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/atomic.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/bitMap.inline.hpp"
40 #include "utilities/macros.hpp"
41 #include "trace/traceMacros.hpp"
43 // An InstanceKlass is the VM level representation of a Java class.
44 // It contains all information needed for at class at execution runtime.
46 // InstanceKlass layout:
47 // [C++ vtbl pointer ] Klass
48 // [subtype cache ] Klass
49 // [instance size ] Klass
50 // [java mirror ] Klass
51 // [super ] Klass
52 // [access_flags ] Klass
53 // [name ] Klass
54 // [first subklass ] Klass
55 // [next sibling ] Klass
56 // [array klasses ]
57 // [methods ]
58 // [local interfaces ]
59 // [transitive interfaces ]
60 // [fields ]
61 // [constants ]
62 // [class loader ]
63 // [source file name ]
64 // [inner classes ]
65 // [static field size ]
66 // [nonstatic field size ]
67 // [static oop fields size ]
68 // [nonstatic oop maps size ]
69 // [has finalize method ]
70 // [deoptimization mark bit ]
71 // [initialization state ]
72 // [initializing thread ]
73 // [Java vtable length ]
74 // [oop map cache (stack maps) ]
75 // [EMBEDDED Java vtable ] size in words = vtable_len
76 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
77 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
78 // indicating where oops are located in instances of this klass.
79 // [EMBEDDED implementor of the interface] only exist for interface
80 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
83 // forward declaration for class -- see below for definition
84 class SuperTypeClosure;
85 class JNIid;
86 class jniIdMapBase;
87 class BreakpointInfo;
88 class fieldDescriptor;
89 class DepChange;
90 class nmethodBucket;
91 class PreviousVersionNode;
92 class JvmtiCachedClassFieldMap;
93 class MemberNameTable;
95 // This is used in iterators below.
96 class FieldClosure: public StackObj {
97 public:
98 virtual void do_field(fieldDescriptor* fd) = 0;
99 };
101 #ifndef PRODUCT
102 // Print fields.
103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
104 class FieldPrinter: public FieldClosure {
105 oop _obj;
106 outputStream* _st;
107 public:
108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
109 void do_field(fieldDescriptor* fd);
110 };
111 #endif // !PRODUCT
113 // ValueObjs embedded in klass. Describes where oops are located in instances of
114 // this klass.
115 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
116 public:
117 // Byte offset of the first oop mapped by this block.
118 int offset() const { return _offset; }
119 void set_offset(int offset) { _offset = offset; }
121 // Number of oops in this block.
122 uint count() const { return _count; }
123 void set_count(uint count) { _count = count; }
125 // sizeof(OopMapBlock) in HeapWords.
126 static const int size_in_words() {
127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
128 LogHeapWordSize;
129 }
131 private:
132 int _offset;
133 uint _count;
134 };
136 struct JvmtiCachedClassFileData;
138 class InstanceKlass: public Klass {
139 friend class VMStructs;
140 friend class ClassFileParser;
141 friend class CompileReplay;
143 protected:
144 // Constructor
145 InstanceKlass(int vtable_len,
146 int itable_len,
147 int static_field_size,
148 int nonstatic_oop_map_size,
149 ReferenceType rt,
150 AccessFlags access_flags,
151 bool is_anonymous);
152 public:
153 static InstanceKlass* allocate_instance_klass(
154 ClassLoaderData* loader_data,
155 int vtable_len,
156 int itable_len,
157 int static_field_size,
158 int nonstatic_oop_map_size,
159 ReferenceType rt,
160 AccessFlags access_flags,
161 Symbol* name,
162 Klass* super_klass,
163 bool is_anonymous,
164 TRAPS);
166 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
168 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
169 // of the class loading & initialization procedure, and the use of the states.
170 enum ClassState {
171 allocated, // allocated (but not yet linked)
172 loaded, // loaded and inserted in class hierarchy (but not linked yet)
173 linked, // successfully linked/verified (but not initialized yet)
174 being_initialized, // currently running class initializer
175 fully_initialized, // initialized (successfull final state)
176 initialization_error // error happened during initialization
177 };
179 static int number_of_instance_classes() { return _total_instanceKlass_count; }
181 private:
182 static volatile int _total_instanceKlass_count;
184 protected:
185 // Annotations for this class
186 Annotations* _annotations;
187 // Array classes holding elements of this class.
188 Klass* _array_klasses;
189 // Constant pool for this class.
190 ConstantPool* _constants;
191 // The InnerClasses attribute and EnclosingMethod attribute. The
192 // _inner_classes is an array of shorts. If the class has InnerClasses
193 // attribute, then the _inner_classes array begins with 4-tuples of shorts
194 // [inner_class_info_index, outer_class_info_index,
195 // inner_name_index, inner_class_access_flags] for the InnerClasses
196 // attribute. If the EnclosingMethod attribute exists, it occupies the
197 // last two shorts [class_index, method_index] of the array. If only
198 // the InnerClasses attribute exists, the _inner_classes array length is
199 // number_of_inner_classes * 4. If the class has both InnerClasses
200 // and EnclosingMethod attributes the _inner_classes array length is
201 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
202 Array<jushort>* _inner_classes;
204 // the source debug extension for this klass, NULL if not specified.
205 // Specified as UTF-8 string without terminating zero byte in the classfile,
206 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
207 char* _source_debug_extension;
208 // Array name derived from this class which needs unreferencing
209 // if this class is unloaded.
210 Symbol* _array_name;
212 // Number of heapOopSize words used by non-static fields in this klass
213 // (including inherited fields but after header_size()).
214 int _nonstatic_field_size;
215 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
216 // Constant pool index to the utf8 entry of the Generic signature,
217 // or 0 if none.
218 u2 _generic_signature_index;
219 // Constant pool index to the utf8 entry for the name of source file
220 // containing this klass, 0 if not specified.
221 u2 _source_file_name_index;
222 u2 _static_oop_field_count;// number of static oop fields in this klass
223 u2 _java_fields_count; // The number of declared Java fields
224 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
226 // _is_marked_dependent can be set concurrently, thus cannot be part of the
227 // _misc_flags.
228 bool _is_marked_dependent; // used for marking during flushing and deoptimization
230 enum {
231 _misc_rewritten = 1 << 0, // methods rewritten.
232 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
233 _misc_should_verify_class = 1 << 2, // allow caching of preverification
234 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
235 _misc_is_contended = 1 << 4, // marked with contended annotation
236 _misc_has_default_methods = 1 << 5 // class/superclass/implemented interfaces has default methods
237 };
238 u2 _misc_flags;
239 u2 _minor_version; // minor version number of class file
240 u2 _major_version; // major version number of class file
241 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
242 int _vtable_len; // length of Java vtable (in words)
243 int _itable_len; // length of Java itable (in words)
244 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
245 MemberNameTable* _member_names; // Member names
246 JNIid* _jni_ids; // First JNI identifier for static fields in this class
247 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
248 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
249 nmethodBucket* _dependencies; // list of dependent nmethods
250 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
251 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
252 // Array of interesting part(s) of the previous version(s) of this
253 // InstanceKlass. See PreviousVersionWalker below.
254 GrowableArray<PreviousVersionNode *>* _previous_versions;
255 // JVMTI fields can be moved to their own structure - see 6315920
256 // JVMTI: cached class file, before retransformable agent modified it in CFLH
257 JvmtiCachedClassFileData* _cached_class_file;
259 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
261 // Class states are defined as ClassState (see above).
262 // Place the _init_state here to utilize the unused 2-byte after
263 // _idnum_allocated_count.
264 u1 _init_state; // state of class
265 u1 _reference_type; // reference type
267 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
269 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
271 // Method array.
272 Array<Method*>* _methods;
273 // Interface (Klass*s) this class declares locally to implement.
274 Array<Klass*>* _local_interfaces;
275 // Interface (Klass*s) this class implements transitively.
276 Array<Klass*>* _transitive_interfaces;
277 // Int array containing the original order of method in the class file (for JVMTI).
278 Array<int>* _method_ordering;
279 // Instance and static variable information, starts with 6-tuples of shorts
280 // [access, name index, sig index, initval index, low_offset, high_offset]
281 // for all fields, followed by the generic signature data at the end of
282 // the array. Only fields with generic signature attributes have the generic
283 // signature data set in the array. The fields array looks like following:
284 //
285 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
286 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
287 // ...
288 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
289 // [generic signature index]
290 // [generic signature index]
291 // ...
292 Array<u2>* _fields;
294 // embedded Java vtable follows here
295 // embedded Java itables follows here
296 // embedded static fields follows here
297 // embedded nonstatic oop-map blocks follows here
298 // embedded implementor of this interface follows here
299 // The embedded implementor only exists if the current klass is an
300 // iterface. The possible values of the implementor fall into following
301 // three cases:
302 // NULL: no implementor.
303 // A Klass* that's not itself: one implementor.
304 // Itsef: more than one implementors.
305 // embedded host klass follows here
306 // The embedded host klass only exists in an anonymous class for
307 // dynamic language support (JSR 292 enabled). The host class grants
308 // its access privileges to this class also. The host class is either
309 // named, or a previously loaded anonymous class. A non-anonymous class
310 // or an anonymous class loaded through normal classloading does not
311 // have this embedded field.
312 //
314 friend class SystemDictionary;
316 public:
317 bool has_nonstatic_fields() const {
318 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
319 }
320 void set_has_nonstatic_fields(bool b) {
321 if (b) {
322 _misc_flags |= _misc_has_nonstatic_fields;
323 } else {
324 _misc_flags &= ~_misc_has_nonstatic_fields;
325 }
326 }
328 // field sizes
329 int nonstatic_field_size() const { return _nonstatic_field_size; }
330 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
332 int static_field_size() const { return _static_field_size; }
333 void set_static_field_size(int size) { _static_field_size = size; }
335 int static_oop_field_count() const { return (int)_static_oop_field_count; }
336 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
338 // Java vtable
339 int vtable_length() const { return _vtable_len; }
340 void set_vtable_length(int len) { _vtable_len = len; }
342 // Java itable
343 int itable_length() const { return _itable_len; }
344 void set_itable_length(int len) { _itable_len = len; }
346 // array klasses
347 Klass* array_klasses() const { return _array_klasses; }
348 void set_array_klasses(Klass* k) { _array_klasses = k; }
350 // methods
351 Array<Method*>* methods() const { return _methods; }
352 void set_methods(Array<Method*>* a) { _methods = a; }
353 Method* method_with_idnum(int idnum);
355 // method ordering
356 Array<int>* method_ordering() const { return _method_ordering; }
357 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
358 void copy_method_ordering(intArray* m, TRAPS);
360 // interfaces
361 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
362 void set_local_interfaces(Array<Klass*>* a) {
363 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
364 _local_interfaces = a; }
366 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
367 void set_transitive_interfaces(Array<Klass*>* a) {
368 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
369 _transitive_interfaces = a;
370 }
372 private:
373 friend class fieldDescriptor;
374 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
376 public:
377 int field_offset (int index) const { return field(index)->offset(); }
378 int field_access_flags(int index) const { return field(index)->access_flags(); }
379 Symbol* field_name (int index) const { return field(index)->name(constants()); }
380 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
382 // Number of Java declared fields
383 int java_fields_count() const { return (int)_java_fields_count; }
385 Array<u2>* fields() const { return _fields; }
386 void set_fields(Array<u2>* f, u2 java_fields_count) {
387 guarantee(_fields == NULL || f == NULL, "Just checking");
388 _fields = f;
389 _java_fields_count = java_fields_count;
390 }
392 // inner classes
393 Array<u2>* inner_classes() const { return _inner_classes; }
394 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
396 enum InnerClassAttributeOffset {
397 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
398 inner_class_inner_class_info_offset = 0,
399 inner_class_outer_class_info_offset = 1,
400 inner_class_inner_name_offset = 2,
401 inner_class_access_flags_offset = 3,
402 inner_class_next_offset = 4
403 };
405 enum EnclosingMethodAttributeOffset {
406 enclosing_method_class_index_offset = 0,
407 enclosing_method_method_index_offset = 1,
408 enclosing_method_attribute_size = 2
409 };
411 // method override check
412 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
414 // package
415 bool is_same_class_package(Klass* class2);
416 bool is_same_class_package(oop classloader2, Symbol* classname2);
417 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
419 // find an enclosing class (defined where original code was, in jvm.cpp!)
420 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
421 instanceKlassHandle self(THREAD, this);
422 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
423 }
424 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
425 bool* inner_is_member, TRAPS);
427 // tell if two classes have the same enclosing class (at package level)
428 bool is_same_package_member(Klass* class2, TRAPS) {
429 instanceKlassHandle self(THREAD, this);
430 return is_same_package_member_impl(self, class2, THREAD);
431 }
432 static bool is_same_package_member_impl(instanceKlassHandle self,
433 Klass* class2, TRAPS);
435 // initialization state
436 bool is_loaded() const { return _init_state >= loaded; }
437 bool is_linked() const { return _init_state >= linked; }
438 bool is_initialized() const { return _init_state == fully_initialized; }
439 bool is_not_initialized() const { return _init_state < being_initialized; }
440 bool is_being_initialized() const { return _init_state == being_initialized; }
441 bool is_in_error_state() const { return _init_state == initialization_error; }
442 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
443 ClassState init_state() { return (ClassState)_init_state; }
444 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
446 // defineClass specified verification
447 bool should_verify_class() const {
448 return (_misc_flags & _misc_should_verify_class) != 0;
449 }
450 void set_should_verify_class(bool value) {
451 if (value) {
452 _misc_flags |= _misc_should_verify_class;
453 } else {
454 _misc_flags &= ~_misc_should_verify_class;
455 }
456 }
458 // marking
459 bool is_marked_dependent() const { return _is_marked_dependent; }
460 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
462 // initialization (virtuals from Klass)
463 bool should_be_initialized() const; // means that initialize should be called
464 void initialize(TRAPS);
465 void link_class(TRAPS);
466 bool link_class_or_fail(TRAPS); // returns false on failure
467 void unlink_class();
468 void rewrite_class(TRAPS);
469 void link_methods(TRAPS);
470 Method* class_initializer();
472 // set the class to initialized if no static initializer is present
473 void eager_initialize(Thread *thread);
475 // reference type
476 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
477 void set_reference_type(ReferenceType t) {
478 assert(t == (u1)t, "overflow");
479 _reference_type = (u1)t;
480 }
482 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
484 // find local field, returns true if found
485 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
486 // find field in direct superinterfaces, returns the interface in which the field is defined
487 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
488 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
489 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
490 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
491 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
493 // find a non-static or static field given its offset within the class.
494 bool contains_field_offset(int offset) {
495 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
496 }
498 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
499 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
501 // find a local method (returns NULL if not found)
502 Method* find_method(Symbol* name, Symbol* signature) const;
503 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
505 // lookup operation (returns NULL if not found)
506 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
508 // lookup a method in all the interfaces that this class implements
509 // (returns NULL if not found)
510 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
512 // Find method indices by name. If a method with the specified name is
513 // found the index to the first method is returned, and 'end' is filled in
514 // with the index of first non-name-matching method. If no method is found
515 // -1 is returned.
516 int find_method_by_name(Symbol* name, int* end);
517 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
519 // constant pool
520 ConstantPool* constants() const { return _constants; }
521 void set_constants(ConstantPool* c) { _constants = c; }
523 // protection domain
524 oop protection_domain() const;
526 // signers
527 objArrayOop signers() const;
529 // host class
530 Klass* host_klass() const {
531 Klass** hk = (Klass**)adr_host_klass();
532 if (hk == NULL) {
533 return NULL;
534 } else {
535 return *hk;
536 }
537 }
538 void set_host_klass(Klass* host) {
539 assert(is_anonymous(), "not anonymous");
540 Klass** addr = (Klass**)adr_host_klass();
541 assert(addr != NULL, "no reversed space");
542 if (addr != NULL) {
543 *addr = host;
544 }
545 }
546 bool is_anonymous() const {
547 return (_misc_flags & _misc_is_anonymous) != 0;
548 }
549 void set_is_anonymous(bool value) {
550 if (value) {
551 _misc_flags |= _misc_is_anonymous;
552 } else {
553 _misc_flags &= ~_misc_is_anonymous;
554 }
555 }
557 // Oop that keeps the metadata for this class from being unloaded
558 // in places where the metadata is stored in other places, like nmethods
559 oop klass_holder() const {
560 return is_anonymous() ? java_mirror() : class_loader();
561 }
563 bool is_contended() const {
564 return (_misc_flags & _misc_is_contended) != 0;
565 }
566 void set_is_contended(bool value) {
567 if (value) {
568 _misc_flags |= _misc_is_contended;
569 } else {
570 _misc_flags &= ~_misc_is_contended;
571 }
572 }
574 // source file name
575 Symbol* source_file_name() const {
576 return (_source_file_name_index == 0) ?
577 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
578 }
579 u2 source_file_name_index() const {
580 return _source_file_name_index;
581 }
582 void set_source_file_name_index(u2 sourcefile_index) {
583 _source_file_name_index = sourcefile_index;
584 }
586 // minor and major version numbers of class file
587 u2 minor_version() const { return _minor_version; }
588 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
589 u2 major_version() const { return _major_version; }
590 void set_major_version(u2 major_version) { _major_version = major_version; }
592 // source debug extension
593 char* source_debug_extension() const { return _source_debug_extension; }
594 void set_source_debug_extension(char* array, int length);
596 // symbol unloading support (refcount already added)
597 Symbol* array_name() { return _array_name; }
598 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
600 // nonstatic oop-map blocks
601 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
602 return oop_map_count * OopMapBlock::size_in_words();
603 }
604 unsigned int nonstatic_oop_map_count() const {
605 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
606 }
607 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
608 void set_nonstatic_oop_map_size(int words) {
609 _nonstatic_oop_map_size = words;
610 }
612 // RedefineClasses() support for previous versions:
613 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
614 int emcp_method_count);
615 // If the _previous_versions array is non-NULL, then this klass
616 // has been redefined at least once even if we aren't currently
617 // tracking a previous version.
618 bool has_been_redefined() const { return _previous_versions != NULL; }
619 bool has_previous_version() const;
620 void init_previous_versions() {
621 _previous_versions = NULL;
622 }
623 GrowableArray<PreviousVersionNode *>* previous_versions() const {
624 return _previous_versions;
625 }
627 static void purge_previous_versions(InstanceKlass* ik);
629 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
630 void set_cached_class_file(JvmtiCachedClassFileData *data) {
631 _cached_class_file = data;
632 }
633 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
634 jint get_cached_class_file_len();
635 unsigned char * get_cached_class_file_bytes();
637 // JVMTI: Support for caching of field indices, types, and offsets
638 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
639 _jvmti_cached_class_field_map = descriptor;
640 }
641 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
642 return _jvmti_cached_class_field_map;
643 }
645 bool has_default_methods() const {
646 return (_misc_flags & _misc_has_default_methods) != 0;
647 }
648 void set_has_default_methods(bool b) {
649 if (b) {
650 _misc_flags |= _misc_has_default_methods;
651 } else {
652 _misc_flags &= ~_misc_has_default_methods;
653 }
654 }
656 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
657 inline u2 next_method_idnum();
658 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
660 // generics support
661 Symbol* generic_signature() const {
662 return (_generic_signature_index == 0) ?
663 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
664 }
665 u2 generic_signature_index() const {
666 return _generic_signature_index;
667 }
668 void set_generic_signature_index(u2 sig_index) {
669 _generic_signature_index = sig_index;
670 }
672 u2 enclosing_method_data(int offset);
673 u2 enclosing_method_class_index() {
674 return enclosing_method_data(enclosing_method_class_index_offset);
675 }
676 u2 enclosing_method_method_index() {
677 return enclosing_method_data(enclosing_method_method_index_offset);
678 }
679 void set_enclosing_method_indices(u2 class_index,
680 u2 method_index);
682 // jmethodID support
683 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
684 methodHandle method_h);
685 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
686 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
687 jmethodID* to_dealloc_id_p,
688 jmethodID** to_dealloc_jmeths_p);
689 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
690 size_t *length_p, jmethodID* id_p);
691 jmethodID jmethod_id_or_null(Method* method);
693 // cached itable index support
694 void set_cached_itable_index(size_t idnum, int index);
695 int cached_itable_index(size_t idnum);
697 // annotations support
698 Annotations* annotations() const { return _annotations; }
699 void set_annotations(Annotations* anno) { _annotations = anno; }
701 AnnotationArray* class_annotations() const {
702 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
703 }
704 Array<AnnotationArray*>* fields_annotations() const {
705 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
706 }
707 AnnotationArray* class_type_annotations() const {
708 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
709 }
710 Array<AnnotationArray*>* fields_type_annotations() const {
711 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
712 }
713 // allocation
714 instanceOop allocate_instance(TRAPS);
716 // additional member function to return a handle
717 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
719 objArrayOop allocate_objArray(int n, int length, TRAPS);
720 // Helper function
721 static instanceOop register_finalizer(instanceOop i, TRAPS);
723 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
724 // if not, throw either an Error or an Exception.
725 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
727 // initialization
728 void call_class_initializer(TRAPS);
729 void set_initialization_state_and_notify(ClassState state, TRAPS);
731 // OopMapCache support
732 OopMapCache* oop_map_cache() { return _oop_map_cache; }
733 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
734 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
736 // JNI identifier support (for static fields - for jni performance)
737 JNIid* jni_ids() { return _jni_ids; }
738 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
739 JNIid* jni_id_for(int offset);
741 // maintenance of deoptimization dependencies
742 int mark_dependent_nmethods(DepChange& changes);
743 void add_dependent_nmethod(nmethod* nm);
744 void remove_dependent_nmethod(nmethod* nm);
746 // On-stack replacement support
747 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
748 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
749 void add_osr_nmethod(nmethod* n);
750 void remove_osr_nmethod(nmethod* n);
751 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
753 // Breakpoint support (see methods on Method* for details)
754 BreakpointInfo* breakpoints() const { return _breakpoints; };
755 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
757 // support for stub routines
758 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
759 TRACE_DEFINE_OFFSET;
760 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
762 // subclass/subinterface checks
763 bool implements_interface(Klass* k) const;
765 // Access to the implementor of an interface.
766 Klass* implementor() const
767 {
768 Klass** k = adr_implementor();
769 if (k == NULL) {
770 return NULL;
771 } else {
772 return *k;
773 }
774 }
776 void set_implementor(Klass* k) {
777 assert(is_interface(), "not interface");
778 Klass** addr = adr_implementor();
779 assert(addr != NULL, "null addr");
780 if (addr != NULL) {
781 *addr = k;
782 }
783 }
785 int nof_implementors() const {
786 Klass* k = implementor();
787 if (k == NULL) {
788 return 0;
789 } else if (k != this) {
790 return 1;
791 } else {
792 return 2;
793 }
794 }
796 void add_implementor(Klass* k); // k is a new class that implements this interface
797 void init_implementor(); // initialize
799 // link this class into the implementors list of every interface it implements
800 void process_interfaces(Thread *thread);
802 // virtual operations from Klass
803 bool is_leaf_class() const { return _subklass == NULL; }
804 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
805 bool compute_is_subtype_of(Klass* k);
806 bool can_be_primary_super_slow() const;
807 int oop_size(oop obj) const { return size_helper(); }
808 bool oop_is_instance_slow() const { return true; }
810 // Iterators
811 void do_local_static_fields(FieldClosure* cl);
812 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
813 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
815 void methods_do(void f(Method* method));
816 void array_klasses_do(void f(Klass* k));
817 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
818 bool super_types_do(SuperTypeClosure* blk);
820 // Casting from Klass*
821 static InstanceKlass* cast(Klass* k) {
822 assert(k->is_klass(), "must be");
823 assert(k->oop_is_instance(), "cast to InstanceKlass");
824 return (InstanceKlass*) k;
825 }
827 InstanceKlass* java_super() const {
828 return (super() == NULL) ? NULL : cast(super());
829 }
831 // Sizing (in words)
832 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
834 static int size(int vtable_length, int itable_length,
835 int nonstatic_oop_map_size,
836 bool is_interface, bool is_anonymous) {
837 return align_object_size(header_size() +
838 align_object_offset(vtable_length) +
839 align_object_offset(itable_length) +
840 ((is_interface || is_anonymous) ?
841 align_object_offset(nonstatic_oop_map_size) :
842 nonstatic_oop_map_size) +
843 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
844 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
845 }
846 int size() const { return size(vtable_length(),
847 itable_length(),
848 nonstatic_oop_map_size(),
849 is_interface(),
850 is_anonymous());
851 }
852 #if INCLUDE_SERVICES
853 virtual void collect_statistics(KlassSizeStats *sz) const;
854 #endif
856 static int vtable_start_offset() { return header_size(); }
857 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
859 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
860 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
861 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
863 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
865 address static_field_addr(int offset);
867 OopMapBlock* start_of_nonstatic_oop_maps() const {
868 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
869 }
871 Klass** end_of_nonstatic_oop_maps() const {
872 return (Klass**)(start_of_nonstatic_oop_maps() +
873 nonstatic_oop_map_count());
874 }
876 Klass** adr_implementor() const {
877 if (is_interface()) {
878 return (Klass**)end_of_nonstatic_oop_maps();
879 } else {
880 return NULL;
881 }
882 };
884 Klass** adr_host_klass() const {
885 if (is_anonymous()) {
886 Klass** adr_impl = adr_implementor();
887 if (adr_impl != NULL) {
888 return adr_impl + 1;
889 } else {
890 return end_of_nonstatic_oop_maps();
891 }
892 } else {
893 return NULL;
894 }
895 }
897 // Use this to return the size of an instance in heap words:
898 int size_helper() const {
899 return layout_helper_to_size_helper(layout_helper());
900 }
902 // This bit is initialized in classFileParser.cpp.
903 // It is false under any of the following conditions:
904 // - the class is abstract (including any interface)
905 // - the class has a finalizer (if !RegisterFinalizersAtInit)
906 // - the class size is larger than FastAllocateSizeLimit
907 // - the class is java/lang/Class, which cannot be allocated directly
908 bool can_be_fastpath_allocated() const {
909 return !layout_helper_needs_slow_path(layout_helper());
910 }
912 // Java vtable/itable
913 klassVtable* vtable() const; // return new klassVtable wrapper
914 inline Method* method_at_vtable(int index);
915 klassItable* itable() const; // return new klassItable wrapper
916 Method* method_at_itable(Klass* holder, int index, TRAPS);
918 // Garbage collection
919 void oop_follow_contents(oop obj);
920 int oop_adjust_pointers(oop obj);
922 void clean_implementors_list(BoolObjectClosure* is_alive);
923 void clean_method_data(BoolObjectClosure* is_alive);
925 // Explicit metaspace deallocation of fields
926 // For RedefineClasses and class file parsing errors, we need to deallocate
927 // instanceKlasses and the metadata they point to.
928 void deallocate_contents(ClassLoaderData* loader_data);
929 static void deallocate_methods(ClassLoaderData* loader_data,
930 Array<Method*>* methods);
931 void static deallocate_interfaces(ClassLoaderData* loader_data,
932 Klass* super_klass,
933 Array<Klass*>* local_interfaces,
934 Array<Klass*>* transitive_interfaces);
936 // The constant pool is on stack if any of the methods are executing or
937 // referenced by handles.
938 bool on_stack() const { return _constants->on_stack(); }
940 // callbacks for actions during class unloading
941 static void notify_unload_class(InstanceKlass* ik);
942 static void release_C_heap_structures(InstanceKlass* ik);
944 // Parallel Scavenge and Parallel Old
945 PARALLEL_GC_DECLS
947 // Naming
948 const char* signature_name() const;
950 // Iterators
951 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
952 return oop_oop_iterate_v(obj, blk);
953 }
955 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
956 return oop_oop_iterate_v_m(obj, blk, mr);
957 }
959 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
960 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
961 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
962 MemRegion mr);
964 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
965 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
967 #if INCLUDE_ALL_GCS
968 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
969 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
971 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
972 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
973 #endif // INCLUDE_ALL_GCS
975 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
977 private:
978 // initialization state
979 #ifdef ASSERT
980 void set_init_state(ClassState state);
981 #else
982 void set_init_state(ClassState state) { _init_state = (u1)state; }
983 #endif
984 void set_rewritten() { _misc_flags |= _misc_rewritten; }
985 void set_init_thread(Thread *thread) { _init_thread = thread; }
987 // The RedefineClasses() API can cause new method idnums to be needed
988 // which will cause the caches to grow. Safety requires different
989 // cache management logic if the caches can grow instead of just
990 // going from NULL to non-NULL.
991 bool idnum_can_increment() const { return has_been_redefined(); }
992 jmethodID* methods_jmethod_ids_acquire() const
993 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
994 void release_set_methods_jmethod_ids(jmethodID* jmeths)
995 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
997 int* methods_cached_itable_indices_acquire() const
998 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
999 void release_set_methods_cached_itable_indices(int* indices)
1000 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
1002 // Lock during initialization
1003 public:
1004 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1005 // Must be one per class and it has to be a VM internal object so java code
1006 // cannot lock it (like the mirror).
1007 // It has to be an object not a Mutex because it's held through java calls.
1008 volatile oop init_lock() const;
1009 private:
1011 // Static methods that are used to implement member methods where an exposed this pointer
1012 // is needed due to possible GCs
1013 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1014 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1015 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1016 static void eager_initialize_impl (instanceKlassHandle this_oop);
1017 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1018 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1019 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1020 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
1021 /* jni_id_for_impl for jfieldID only */
1022 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1024 // Returns the array class for the n'th dimension
1025 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1027 // Returns the array class with this class as element type
1028 Klass* array_klass_impl(bool or_null, TRAPS);
1030 // Free CHeap allocated fields.
1031 void release_C_heap_structures();
1032 public:
1033 // CDS support - remove and restore oops from metadata. Oops are not shared.
1034 virtual void remove_unshareable_info();
1035 virtual void restore_unshareable_info(TRAPS);
1037 // jvm support
1038 jint compute_modifier_flags(TRAPS) const;
1040 // JSR-292 support
1041 MemberNameTable* member_names() { return _member_names; }
1042 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1043 void add_member_name(int index, Handle member_name);
1044 oop get_member_name(int index);
1046 public:
1047 // JVMTI support
1048 jint jvmti_class_status() const;
1050 public:
1051 // Printing
1052 #ifndef PRODUCT
1053 void print_on(outputStream* st) const;
1054 #endif
1055 void print_value_on(outputStream* st) const;
1057 void oop_print_value_on(oop obj, outputStream* st);
1059 #ifndef PRODUCT
1060 void oop_print_on (oop obj, outputStream* st);
1062 void print_dependent_nmethods(bool verbose = false);
1063 bool is_dependent_nmethod(nmethod* nm);
1064 #endif
1066 const char* internal_name() const;
1068 // Verification
1069 void verify_on(outputStream* st, bool check_dictionary);
1071 void oop_verify_on(oop obj, outputStream* st);
1072 };
1074 inline Method* InstanceKlass::method_at_vtable(int index) {
1075 #ifndef PRODUCT
1076 assert(index >= 0, "valid vtable index");
1077 if (DebugVtables) {
1078 verify_vtable_index(index);
1079 }
1080 #endif
1081 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1082 return ve[index].method();
1083 }
1085 // for adding methods
1086 // UNSET_IDNUM return means no more ids available
1087 inline u2 InstanceKlass::next_method_idnum() {
1088 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1089 return ConstMethod::UNSET_IDNUM; // no more ids available
1090 } else {
1091 return _idnum_allocated_count++;
1092 }
1093 }
1096 /* JNIid class for jfieldIDs only */
1097 class JNIid: public CHeapObj<mtClass> {
1098 friend class VMStructs;
1099 private:
1100 Klass* _holder;
1101 JNIid* _next;
1102 int _offset;
1103 #ifdef ASSERT
1104 bool _is_static_field_id;
1105 #endif
1107 public:
1108 // Accessors
1109 Klass* holder() const { return _holder; }
1110 int offset() const { return _offset; }
1111 JNIid* next() { return _next; }
1112 // Constructor
1113 JNIid(Klass* holder, int offset, JNIid* next);
1114 // Identifier lookup
1115 JNIid* find(int offset);
1117 bool find_local_field(fieldDescriptor* fd) {
1118 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1119 }
1121 static void deallocate(JNIid* id);
1122 // Debugging
1123 #ifdef ASSERT
1124 bool is_static_field_id() const { return _is_static_field_id; }
1125 void set_is_static_field_id() { _is_static_field_id = true; }
1126 #endif
1127 void verify(Klass* holder);
1128 };
1131 // If breakpoints are more numerous than just JVMTI breakpoints,
1132 // consider compressing this data structure.
1133 // It is currently a simple linked list defined in method.hpp.
1135 class BreakpointInfo;
1138 // A collection point for interesting information about the previous
1139 // version(s) of an InstanceKlass. A GrowableArray of PreviousVersionNodes
1140 // is attached to the InstanceKlass as needed. See PreviousVersionWalker below.
1141 class PreviousVersionNode : public CHeapObj<mtClass> {
1142 private:
1143 ConstantPool* _prev_constant_pool;
1145 // If the previous version of the InstanceKlass doesn't have any
1146 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1147 // EMCP methods have been collected, then _prev_EMCP_methods can
1148 // have a length of zero.
1149 GrowableArray<Method*>* _prev_EMCP_methods;
1151 public:
1152 PreviousVersionNode(ConstantPool* prev_constant_pool,
1153 GrowableArray<Method*>* prev_EMCP_methods);
1154 ~PreviousVersionNode();
1155 ConstantPool* prev_constant_pool() const {
1156 return _prev_constant_pool;
1157 }
1158 GrowableArray<Method*>* prev_EMCP_methods() const {
1159 return _prev_EMCP_methods;
1160 }
1161 };
1164 // Helper object for walking previous versions.
1165 class PreviousVersionWalker : public StackObj {
1166 private:
1167 Thread* _thread;
1168 GrowableArray<PreviousVersionNode *>* _previous_versions;
1169 int _current_index;
1171 // A pointer to the current node object so we can handle the deletes.
1172 PreviousVersionNode* _current_p;
1174 // The constant pool handle keeps all the methods in this class from being
1175 // deallocated from the metaspace during class unloading.
1176 constantPoolHandle _current_constant_pool_handle;
1178 public:
1179 PreviousVersionWalker(Thread* thread, InstanceKlass *ik);
1181 // Return the interesting information for the next previous version
1182 // of the klass. Returns NULL if there are no more previous versions.
1183 PreviousVersionNode* next_previous_version();
1184 };
1187 //
1188 // nmethodBucket is used to record dependent nmethods for
1189 // deoptimization. nmethod dependencies are actually <klass, method>
1190 // pairs but we really only care about the klass part for purposes of
1191 // finding nmethods which might need to be deoptimized. Instead of
1192 // recording the method, a count of how many times a particular nmethod
1193 // was recorded is kept. This ensures that any recording errors are
1194 // noticed since an nmethod should be removed as many times are it's
1195 // added.
1196 //
1197 class nmethodBucket: public CHeapObj<mtClass> {
1198 friend class VMStructs;
1199 private:
1200 nmethod* _nmethod;
1201 int _count;
1202 nmethodBucket* _next;
1204 public:
1205 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1206 _nmethod = nmethod;
1207 _next = next;
1208 _count = 1;
1209 }
1210 int count() { return _count; }
1211 int increment() { _count += 1; return _count; }
1212 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1213 nmethodBucket* next() { return _next; }
1214 void set_next(nmethodBucket* b) { _next = b; }
1215 nmethod* get_nmethod() { return _nmethod; }
1216 };
1218 // An iterator that's used to access the inner classes indices in the
1219 // InstanceKlass::_inner_classes array.
1220 class InnerClassesIterator : public StackObj {
1221 private:
1222 Array<jushort>* _inner_classes;
1223 int _length;
1224 int _idx;
1225 public:
1227 InnerClassesIterator(instanceKlassHandle k) {
1228 _inner_classes = k->inner_classes();
1229 if (k->inner_classes() != NULL) {
1230 _length = _inner_classes->length();
1231 // The inner class array's length should be the multiple of
1232 // inner_class_next_offset if it only contains the InnerClasses
1233 // attribute data, or it should be
1234 // n*inner_class_next_offset+enclosing_method_attribute_size
1235 // if it also contains the EnclosingMethod data.
1236 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1237 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1238 "just checking");
1239 // Remove the enclosing_method portion if exists.
1240 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1241 _length -= InstanceKlass::enclosing_method_attribute_size;
1242 }
1243 } else {
1244 _length = 0;
1245 }
1246 _idx = 0;
1247 }
1249 int length() const {
1250 return _length;
1251 }
1253 void next() {
1254 _idx += InstanceKlass::inner_class_next_offset;
1255 }
1257 bool done() const {
1258 return (_idx >= _length);
1259 }
1261 u2 inner_class_info_index() const {
1262 return _inner_classes->at(
1263 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1264 }
1266 void set_inner_class_info_index(u2 index) {
1267 _inner_classes->at_put(
1268 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1269 }
1271 u2 outer_class_info_index() const {
1272 return _inner_classes->at(
1273 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1274 }
1276 void set_outer_class_info_index(u2 index) {
1277 _inner_classes->at_put(
1278 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1279 }
1281 u2 inner_name_index() const {
1282 return _inner_classes->at(
1283 _idx + InstanceKlass::inner_class_inner_name_offset);
1284 }
1286 void set_inner_name_index(u2 index) {
1287 _inner_classes->at_put(
1288 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1289 }
1291 u2 inner_access_flags() const {
1292 return _inner_classes->at(
1293 _idx + InstanceKlass::inner_class_access_flags_offset);
1294 }
1295 };
1297 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP