Fri, 16 Nov 2012 09:19:12 -0500
Merge
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
28 #include "classfile/classLoaderData.hpp"
29 #include "oops/annotations.hpp"
30 #include "oops/constMethod.hpp"
31 #include "oops/fieldInfo.hpp"
32 #include "oops/instanceOop.hpp"
33 #include "oops/klassVtable.hpp"
34 #include "runtime/handles.hpp"
35 #include "runtime/os.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/bitMap.inline.hpp"
39 // An InstanceKlass is the VM level representation of a Java class.
40 // It contains all information needed for at class at execution runtime.
42 // InstanceKlass layout:
43 // [C++ vtbl pointer ] Klass
44 // [subtype cache ] Klass
45 // [instance size ] Klass
46 // [java mirror ] Klass
47 // [super ] Klass
48 // [access_flags ] Klass
49 // [name ] Klass
50 // [first subklass ] Klass
51 // [next sibling ] Klass
52 // [array klasses ]
53 // [methods ]
54 // [local interfaces ]
55 // [transitive interfaces ]
56 // [fields ]
57 // [constants ]
58 // [class loader ]
59 // [protection domain ]
60 // [signers ]
61 // [source file name ]
62 // [inner classes ]
63 // [static field size ]
64 // [nonstatic field size ]
65 // [static oop fields size ]
66 // [nonstatic oop maps size ]
67 // [has finalize method ]
68 // [deoptimization mark bit ]
69 // [initialization state ]
70 // [initializing thread ]
71 // [Java vtable length ]
72 // [oop map cache (stack maps) ]
73 // [EMBEDDED Java vtable ] size in words = vtable_len
74 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
75 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
76 // indicating where oops are located in instances of this klass.
77 // [EMBEDDED implementor of the interface] only exist for interface
78 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
81 // forward declaration for class -- see below for definition
82 class SuperTypeClosure;
83 class JNIid;
84 class jniIdMapBase;
85 class BreakpointInfo;
86 class fieldDescriptor;
87 class DepChange;
88 class nmethodBucket;
89 class PreviousVersionNode;
90 class JvmtiCachedClassFieldMap;
92 // This is used in iterators below.
93 class FieldClosure: public StackObj {
94 public:
95 virtual void do_field(fieldDescriptor* fd) = 0;
96 };
98 #ifndef PRODUCT
99 // Print fields.
100 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
101 class FieldPrinter: public FieldClosure {
102 oop _obj;
103 outputStream* _st;
104 public:
105 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
106 void do_field(fieldDescriptor* fd);
107 };
108 #endif // !PRODUCT
110 // ValueObjs embedded in klass. Describes where oops are located in instances of
111 // this klass.
112 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
113 public:
114 // Byte offset of the first oop mapped by this block.
115 int offset() const { return _offset; }
116 void set_offset(int offset) { _offset = offset; }
118 // Number of oops in this block.
119 uint count() const { return _count; }
120 void set_count(uint count) { _count = count; }
122 // sizeof(OopMapBlock) in HeapWords.
123 static const int size_in_words() {
124 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
125 LogHeapWordSize;
126 }
128 private:
129 int _offset;
130 uint _count;
131 };
133 class InstanceKlass: public Klass {
134 friend class VMStructs;
135 friend class ClassFileParser;
136 friend class CompileReplay;
138 protected:
139 // Constructor
140 InstanceKlass(int vtable_len,
141 int itable_len,
142 int static_field_size,
143 int nonstatic_oop_map_size,
144 ReferenceType rt,
145 AccessFlags access_flags,
146 bool is_anonymous);
147 public:
148 static Klass* allocate_instance_klass(ClassLoaderData* loader_data,
149 int vtable_len,
150 int itable_len,
151 int static_field_size,
152 int nonstatic_oop_map_size,
153 ReferenceType rt,
154 AccessFlags access_flags,
155 Symbol* name,
156 Klass* super_klass,
157 KlassHandle host_klass,
158 TRAPS);
160 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
162 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
163 // of the class loading & initialization procedure, and the use of the states.
164 enum ClassState {
165 allocated, // allocated (but not yet linked)
166 loaded, // loaded and inserted in class hierarchy (but not linked yet)
167 linked, // successfully linked/verified (but not initialized yet)
168 being_initialized, // currently running class initializer
169 fully_initialized, // initialized (successfull final state)
170 initialization_error // error happened during initialization
171 };
173 protected:
174 // Protection domain.
175 oop _protection_domain;
176 // Class signers.
177 objArrayOop _signers;
178 // Initialization lock. Must be one per class and it has to be a VM internal
179 // object so java code cannot lock it (like the mirror)
180 // It has to be an object not a Mutex because it's held through java calls.
181 volatile oop _init_lock;
183 // Annotations for this class
184 Annotations* _annotations;
185 // Array classes holding elements of this class.
186 Klass* _array_klasses;
187 // Constant pool for this class.
188 ConstantPool* _constants;
189 // The InnerClasses attribute and EnclosingMethod attribute. The
190 // _inner_classes is an array of shorts. If the class has InnerClasses
191 // attribute, then the _inner_classes array begins with 4-tuples of shorts
192 // [inner_class_info_index, outer_class_info_index,
193 // inner_name_index, inner_class_access_flags] for the InnerClasses
194 // attribute. If the EnclosingMethod attribute exists, it occupies the
195 // last two shorts [class_index, method_index] of the array. If only
196 // the InnerClasses attribute exists, the _inner_classes array length is
197 // number_of_inner_classes * 4. If the class has both InnerClasses
198 // and EnclosingMethod attributes the _inner_classes array length is
199 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
200 Array<jushort>* _inner_classes;
202 // Name of source file containing this klass, NULL if not specified.
203 Symbol* _source_file_name;
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 // Generic signature, or null if none.
209 Symbol* _generic_signature;
210 // Array name derived from this class which needs unreferencing
211 // if this class is unloaded.
212 Symbol* _array_name;
214 // Number of heapOopSize words used by non-static fields in this klass
215 // (including inherited fields but after header_size()).
216 int _nonstatic_field_size;
217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
218 u2 _static_oop_field_count;// number of static oop fields in this klass
219 u2 _java_fields_count; // The number of declared Java fields
220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
222 bool _is_marked_dependent; // used for marking during flushing and deoptimization
223 enum {
224 _misc_rewritten = 1 << 0, // methods rewritten.
225 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
226 _misc_should_verify_class = 1 << 2, // allow caching of preverification
227 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field
228 };
229 u2 _misc_flags;
230 u2 _minor_version; // minor version number of class file
231 u2 _major_version; // major version number of class file
232 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
233 int _vtable_len; // length of Java vtable (in words)
234 int _itable_len; // length of Java itable (in words)
235 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
236 JNIid* _jni_ids; // First JNI identifier for static fields in this class
237 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
238 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
239 nmethodBucket* _dependencies; // list of dependent nmethods
240 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
241 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
242 // Array of interesting part(s) of the previous version(s) of this
243 // InstanceKlass. See PreviousVersionWalker below.
244 GrowableArray<PreviousVersionNode *>* _previous_versions;
245 // JVMTI fields can be moved to their own structure - see 6315920
246 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
247 jint _cached_class_file_len; // JVMTI: length of above
248 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
250 // true if class, superclass, or implemented interfaces have default methods
251 bool _has_default_methods;
253 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
254 // Method array.
255 Array<Method*>* _methods;
256 // Interface (Klass*s) this class declares locally to implement.
257 Array<Klass*>* _local_interfaces;
258 // Interface (Klass*s) this class implements transitively.
259 Array<Klass*>* _transitive_interfaces;
260 // Int array containing the original order of method in the class file (for JVMTI).
261 Array<int>* _method_ordering;
262 // Instance and static variable information, starts with 6-tuples of shorts
263 // [access, name index, sig index, initval index, low_offset, high_offset]
264 // for all fields, followed by the generic signature data at the end of
265 // the array. Only fields with generic signature attributes have the generic
266 // signature data set in the array. The fields array looks like following:
267 //
268 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
269 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
270 // ...
271 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
272 // [generic signature index]
273 // [generic signature index]
274 // ...
275 Array<u2>* _fields;
277 // Class states are defined as ClassState (see above).
278 // Place the _init_state here to utilize the unused 2-byte after
279 // _idnum_allocated_count.
280 u1 _init_state; // state of class
282 u1 _reference_type; // reference type
284 // embedded Java vtable follows here
285 // embedded Java itables follows here
286 // embedded static fields follows here
287 // embedded nonstatic oop-map blocks follows here
288 // embedded implementor of this interface follows here
289 // The embedded implementor only exists if the current klass is an
290 // iterface. The possible values of the implementor fall into following
291 // three cases:
292 // NULL: no implementor.
293 // A Klass* that's not itself: one implementor.
294 // Itsef: more than one implementors.
295 // embedded host klass follows here
296 // The embedded host klass only exists in an anonymous class for
297 // dynamic language support (JSR 292 enabled). The host class grants
298 // its access privileges to this class also. The host class is either
299 // named, or a previously loaded anonymous class. A non-anonymous class
300 // or an anonymous class loaded through normal classloading does not
301 // have this embedded field.
302 //
304 friend class SystemDictionary;
306 public:
307 bool has_nonstatic_fields() const {
308 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
309 }
310 void set_has_nonstatic_fields(bool b) {
311 if (b) {
312 _misc_flags |= _misc_has_nonstatic_fields;
313 } else {
314 _misc_flags &= ~_misc_has_nonstatic_fields;
315 }
316 }
318 // field sizes
319 int nonstatic_field_size() const { return _nonstatic_field_size; }
320 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
322 int static_field_size() const { return _static_field_size; }
323 void set_static_field_size(int size) { _static_field_size = size; }
325 int static_oop_field_count() const { return (int)_static_oop_field_count; }
326 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
328 // Java vtable
329 int vtable_length() const { return _vtable_len; }
330 void set_vtable_length(int len) { _vtable_len = len; }
332 // Java itable
333 int itable_length() const { return _itable_len; }
334 void set_itable_length(int len) { _itable_len = len; }
336 // array klasses
337 Klass* array_klasses() const { return _array_klasses; }
338 void set_array_klasses(Klass* k) { _array_klasses = k; }
340 // methods
341 Array<Method*>* methods() const { return _methods; }
342 void set_methods(Array<Method*>* a) { _methods = a; }
343 Method* method_with_idnum(int idnum);
345 // method ordering
346 Array<int>* method_ordering() const { return _method_ordering; }
347 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
349 // interfaces
350 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
351 void set_local_interfaces(Array<Klass*>* a) {
352 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
353 _local_interfaces = a; }
354 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
355 void set_transitive_interfaces(Array<Klass*>* a) {
356 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
357 _transitive_interfaces = a; }
359 private:
360 friend class fieldDescriptor;
361 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
363 public:
364 int field_offset (int index) const { return field(index)->offset(); }
365 int field_access_flags(int index) const { return field(index)->access_flags(); }
366 Symbol* field_name (int index) const { return field(index)->name(constants()); }
367 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
369 // Number of Java declared fields
370 int java_fields_count() const { return (int)_java_fields_count; }
372 Array<u2>* fields() const { return _fields; }
374 void set_fields(Array<u2>* f, u2 java_fields_count) {
375 guarantee(_fields == NULL || f == NULL, "Just checking");
376 _fields = f;
377 _java_fields_count = java_fields_count;
378 }
380 // inner classes
381 Array<u2>* inner_classes() const { return _inner_classes; }
382 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
384 enum InnerClassAttributeOffset {
385 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
386 inner_class_inner_class_info_offset = 0,
387 inner_class_outer_class_info_offset = 1,
388 inner_class_inner_name_offset = 2,
389 inner_class_access_flags_offset = 3,
390 inner_class_next_offset = 4
391 };
393 enum EnclosingMethodAttributeOffset {
394 enclosing_method_class_index_offset = 0,
395 enclosing_method_method_index_offset = 1,
396 enclosing_method_attribute_size = 2
397 };
399 // method override check
400 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
402 // package
403 bool is_same_class_package(Klass* class2);
404 bool is_same_class_package(oop classloader2, Symbol* classname2);
405 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
407 // find an enclosing class (defined where original code was, in jvm.cpp!)
408 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
409 instanceKlassHandle self(THREAD, this);
410 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
411 }
412 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
413 bool* inner_is_member, TRAPS);
415 // tell if two classes have the same enclosing class (at package level)
416 bool is_same_package_member(Klass* class2, TRAPS) {
417 instanceKlassHandle self(THREAD, this);
418 return is_same_package_member_impl(self, class2, THREAD);
419 }
420 static bool is_same_package_member_impl(instanceKlassHandle self,
421 Klass* class2, TRAPS);
423 // initialization state
424 bool is_loaded() const { return _init_state >= loaded; }
425 bool is_linked() const { return _init_state >= linked; }
426 bool is_initialized() const { return _init_state == fully_initialized; }
427 bool is_not_initialized() const { return _init_state < being_initialized; }
428 bool is_being_initialized() const { return _init_state == being_initialized; }
429 bool is_in_error_state() const { return _init_state == initialization_error; }
430 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
431 ClassState init_state() { return (ClassState)_init_state; }
432 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
434 // defineClass specified verification
435 bool should_verify_class() const {
436 return (_misc_flags & _misc_should_verify_class) != 0;
437 }
438 void set_should_verify_class(bool value) {
439 if (value) {
440 _misc_flags |= _misc_should_verify_class;
441 } else {
442 _misc_flags &= ~_misc_should_verify_class;
443 }
444 }
446 // marking
447 bool is_marked_dependent() const { return _is_marked_dependent; }
448 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
450 // initialization (virtuals from Klass)
451 bool should_be_initialized() const; // means that initialize should be called
452 void initialize(TRAPS);
453 void link_class(TRAPS);
454 bool link_class_or_fail(TRAPS); // returns false on failure
455 void unlink_class();
456 void rewrite_class(TRAPS);
457 void relocate_and_link_methods(TRAPS);
458 Method* class_initializer();
460 // set the class to initialized if no static initializer is present
461 void eager_initialize(Thread *thread);
463 // reference type
464 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
465 void set_reference_type(ReferenceType t) {
466 assert(t == (u1)t, "overflow");
467 _reference_type = (u1)t;
468 }
470 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
472 // find local field, returns true if found
473 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
474 // find field in direct superinterfaces, returns the interface in which the field is defined
475 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
476 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
477 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
478 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
479 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
481 // find a non-static or static field given its offset within the class.
482 bool contains_field_offset(int offset) {
483 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
484 }
486 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
487 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
489 // find a local method (returns NULL if not found)
490 Method* find_method(Symbol* name, Symbol* signature) const;
491 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
493 // lookup operation (returns NULL if not found)
494 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
496 // lookup a method in all the interfaces that this class implements
497 // (returns NULL if not found)
498 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
500 // Find method indices by name. If a method with the specified name is
501 // found the index to the first method is returned, and 'end' is filled in
502 // with the index of first non-name-matching method. If no method is found
503 // -1 is returned.
504 int find_method_by_name(Symbol* name, int* end);
505 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
507 // constant pool
508 ConstantPool* constants() const { return _constants; }
509 void set_constants(ConstantPool* c) { _constants = c; }
511 // protection domain
512 oop protection_domain() { return _protection_domain; }
513 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
515 // host class
516 Klass* host_klass() const {
517 Klass** hk = (Klass**)adr_host_klass();
518 if (hk == NULL) {
519 return NULL;
520 } else {
521 return *hk;
522 }
523 }
524 void set_host_klass(Klass* host) {
525 assert(is_anonymous(), "not anonymous");
526 Klass** addr = (Klass**)adr_host_klass();
527 assert(addr != NULL, "no reversed space");
528 *addr = host;
529 }
530 bool is_anonymous() const {
531 return (_misc_flags & _misc_is_anonymous) != 0;
532 }
533 void set_is_anonymous(bool value) {
534 if (value) {
535 _misc_flags |= _misc_is_anonymous;
536 } else {
537 _misc_flags &= ~_misc_is_anonymous;
538 }
539 }
541 // signers
542 objArrayOop signers() const { return _signers; }
543 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
545 // source file name
546 Symbol* source_file_name() const { return _source_file_name; }
547 void set_source_file_name(Symbol* n);
549 // minor and major version numbers of class file
550 u2 minor_version() const { return _minor_version; }
551 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
552 u2 major_version() const { return _major_version; }
553 void set_major_version(u2 major_version) { _major_version = major_version; }
555 // source debug extension
556 char* source_debug_extension() const { return _source_debug_extension; }
557 void set_source_debug_extension(char* array, int length);
559 // symbol unloading support (refcount already added)
560 Symbol* array_name() { return _array_name; }
561 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
563 // nonstatic oop-map blocks
564 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
565 return oop_map_count * OopMapBlock::size_in_words();
566 }
567 unsigned int nonstatic_oop_map_count() const {
568 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
569 }
570 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
571 void set_nonstatic_oop_map_size(int words) {
572 _nonstatic_oop_map_size = words;
573 }
575 // RedefineClasses() support for previous versions:
576 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
577 int emcp_method_count);
578 // If the _previous_versions array is non-NULL, then this klass
579 // has been redefined at least once even if we aren't currently
580 // tracking a previous version.
581 bool has_been_redefined() const { return _previous_versions != NULL; }
582 bool has_previous_version() const;
583 void init_previous_versions() {
584 _previous_versions = NULL;
585 }
586 GrowableArray<PreviousVersionNode *>* previous_versions() const {
587 return _previous_versions;
588 }
590 static void purge_previous_versions(InstanceKlass* ik);
592 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
593 void set_cached_class_file(unsigned char *class_file_bytes,
594 jint class_file_len) { _cached_class_file_len = class_file_len;
595 _cached_class_file_bytes = class_file_bytes; }
596 jint get_cached_class_file_len() { return _cached_class_file_len; }
597 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
599 // JVMTI: Support for caching of field indices, types, and offsets
600 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
601 _jvmti_cached_class_field_map = descriptor;
602 }
603 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
604 return _jvmti_cached_class_field_map;
605 }
607 bool has_default_methods() const { return _has_default_methods; }
608 void set_has_default_methods(bool b) { _has_default_methods = b; }
610 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
611 inline u2 next_method_idnum();
612 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
614 // generics support
615 Symbol* generic_signature() const { return _generic_signature; }
616 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
618 u2 enclosing_method_data(int offset);
619 u2 enclosing_method_class_index() {
620 return enclosing_method_data(enclosing_method_class_index_offset);
621 }
622 u2 enclosing_method_method_index() {
623 return enclosing_method_data(enclosing_method_method_index_offset);
624 }
625 void set_enclosing_method_indices(u2 class_index,
626 u2 method_index);
628 // jmethodID support
629 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
630 methodHandle method_h);
631 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
632 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
633 jmethodID* to_dealloc_id_p,
634 jmethodID** to_dealloc_jmeths_p);
635 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
636 size_t *length_p, jmethodID* id_p);
637 jmethodID jmethod_id_or_null(Method* method);
639 // cached itable index support
640 void set_cached_itable_index(size_t idnum, int index);
641 int cached_itable_index(size_t idnum);
643 // annotations support
644 Annotations* annotations() const { return _annotations; }
645 void set_annotations(Annotations* anno) { _annotations = anno; }
646 AnnotationArray* class_annotations() const {
647 if (annotations() == NULL) return NULL;
648 return annotations()->class_annotations();
649 }
650 Array<AnnotationArray*>* fields_annotations() const {
651 if (annotations() == NULL) return NULL;
652 return annotations()->fields_annotations();
653 }
655 // allocation
656 instanceOop allocate_instance(TRAPS);
658 // additional member function to return a handle
659 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
661 objArrayOop allocate_objArray(int n, int length, TRAPS);
662 // Helper function
663 static instanceOop register_finalizer(instanceOop i, TRAPS);
665 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
666 // if not, throw either an Error or an Exception.
667 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
669 // initialization
670 void call_class_initializer(TRAPS);
671 void set_initialization_state_and_notify(ClassState state, TRAPS);
673 // OopMapCache support
674 OopMapCache* oop_map_cache() { return _oop_map_cache; }
675 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
676 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
678 // JNI identifier support (for static fields - for jni performance)
679 JNIid* jni_ids() { return _jni_ids; }
680 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
681 JNIid* jni_id_for(int offset);
683 // maintenance of deoptimization dependencies
684 int mark_dependent_nmethods(DepChange& changes);
685 void add_dependent_nmethod(nmethod* nm);
686 void remove_dependent_nmethod(nmethod* nm);
688 // On-stack replacement support
689 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
690 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
691 void add_osr_nmethod(nmethod* n);
692 void remove_osr_nmethod(nmethod* n);
693 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
695 // Breakpoint support (see methods on Method* for details)
696 BreakpointInfo* breakpoints() const { return _breakpoints; };
697 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
699 // support for stub routines
700 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
701 TRACE_DEFINE_OFFSET;
702 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
704 // subclass/subinterface checks
705 bool implements_interface(Klass* k) const;
707 // Access to the implementor of an interface.
708 Klass* implementor() const
709 {
710 Klass** k = adr_implementor();
711 if (k == NULL) {
712 return NULL;
713 } else {
714 return *k;
715 }
716 }
718 void set_implementor(Klass* k) {
719 assert(is_interface(), "not interface");
720 Klass** addr = adr_implementor();
721 *addr = k;
722 }
724 int nof_implementors() const {
725 Klass* k = implementor();
726 if (k == NULL) {
727 return 0;
728 } else if (k != this) {
729 return 1;
730 } else {
731 return 2;
732 }
733 }
735 void add_implementor(Klass* k); // k is a new class that implements this interface
736 void init_implementor(); // initialize
738 // link this class into the implementors list of every interface it implements
739 void process_interfaces(Thread *thread);
741 // virtual operations from Klass
742 bool is_leaf_class() const { return _subklass == NULL; }
743 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
744 bool compute_is_subtype_of(Klass* k);
745 bool can_be_primary_super_slow() const;
746 int oop_size(oop obj) const { return size_helper(); }
747 bool oop_is_instance_slow() const { return true; }
749 // Iterators
750 void do_local_static_fields(FieldClosure* cl);
751 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
752 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
754 void methods_do(void f(Method* method));
755 void array_klasses_do(void f(Klass* k));
756 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
757 void with_array_klasses_do(void f(Klass* k));
758 bool super_types_do(SuperTypeClosure* blk);
760 // Casting from Klass*
761 static InstanceKlass* cast(Klass* k) {
762 assert(k->is_klass(), "must be");
763 assert(k->oop_is_instance(), "cast to InstanceKlass");
764 return (InstanceKlass*) k;
765 }
767 InstanceKlass* java_super() const {
768 return (super() == NULL) ? NULL : cast(super());
769 }
771 // Sizing (in words)
772 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
773 static int size(int vtable_length, int itable_length,
774 int nonstatic_oop_map_size,
775 bool is_interface, bool is_anonymous) {
776 return align_object_size(header_size() +
777 align_object_offset(vtable_length) +
778 align_object_offset(itable_length) +
779 ((is_interface || is_anonymous) ?
780 align_object_offset(nonstatic_oop_map_size) :
781 nonstatic_oop_map_size) +
782 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
783 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
784 }
785 int size() const { return size(vtable_length(),
786 itable_length(),
787 nonstatic_oop_map_size(),
788 is_interface(),
789 is_anonymous());
790 }
792 static int vtable_start_offset() { return header_size(); }
793 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
795 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
796 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
797 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
799 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
801 address static_field_addr(int offset);
803 OopMapBlock* start_of_nonstatic_oop_maps() const {
804 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
805 }
807 Klass** adr_implementor() const {
808 if (is_interface()) {
809 return (Klass**)(start_of_nonstatic_oop_maps() +
810 nonstatic_oop_map_count());
811 } else {
812 return NULL;
813 }
814 };
816 Klass** adr_host_klass() const {
817 if (is_anonymous()) {
818 Klass** adr_impl = adr_implementor();
819 if (adr_impl != NULL) {
820 return adr_impl + 1;
821 } else {
822 return (Klass**)(start_of_nonstatic_oop_maps() +
823 nonstatic_oop_map_count());
824 }
825 } else {
826 return NULL;
827 }
828 }
830 // Allocation profiling support
831 juint alloc_size() const { return _alloc_count * size_helper(); }
832 void set_alloc_size(juint n) {}
834 // Use this to return the size of an instance in heap words:
835 int size_helper() const {
836 return layout_helper_to_size_helper(layout_helper());
837 }
839 // This bit is initialized in classFileParser.cpp.
840 // It is false under any of the following conditions:
841 // - the class is abstract (including any interface)
842 // - the class has a finalizer (if !RegisterFinalizersAtInit)
843 // - the class size is larger than FastAllocateSizeLimit
844 // - the class is java/lang/Class, which cannot be allocated directly
845 bool can_be_fastpath_allocated() const {
846 return !layout_helper_needs_slow_path(layout_helper());
847 }
849 // Java vtable/itable
850 klassVtable* vtable() const; // return new klassVtable wrapper
851 inline Method* method_at_vtable(int index);
852 klassItable* itable() const; // return new klassItable wrapper
853 Method* method_at_itable(Klass* holder, int index, TRAPS);
855 // Garbage collection
856 virtual void oops_do(OopClosure* cl);
858 void oop_follow_contents(oop obj);
859 int oop_adjust_pointers(oop obj);
861 void clean_implementors_list(BoolObjectClosure* is_alive);
862 void clean_method_data(BoolObjectClosure* is_alive);
864 // Explicit metaspace deallocation of fields
865 // For RedefineClasses, we need to deallocate instanceKlasses
866 void deallocate_contents(ClassLoaderData* loader_data);
868 // The constant pool is on stack if any of the methods are executing or
869 // referenced by handles.
870 bool on_stack() const { return _constants->on_stack(); }
872 void release_C_heap_structures();
874 // Parallel Scavenge and Parallel Old
875 PARALLEL_GC_DECLS
877 // Naming
878 const char* signature_name() const;
880 // Iterators
881 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
882 return oop_oop_iterate_v(obj, blk);
883 }
885 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
886 return oop_oop_iterate_v_m(obj, blk, mr);
887 }
889 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
890 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
891 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
892 MemRegion mr);
894 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
895 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
897 #ifndef SERIALGC
898 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
899 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
901 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
902 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
903 #endif // !SERIALGC
905 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
906 private:
907 // initialization state
908 #ifdef ASSERT
909 void set_init_state(ClassState state);
910 #else
911 void set_init_state(ClassState state) { _init_state = (u1)state; }
912 #endif
913 void set_rewritten() { _misc_flags |= _misc_rewritten; }
914 void set_init_thread(Thread *thread) { _init_thread = thread; }
916 // The RedefineClasses() API can cause new method idnums to be needed
917 // which will cause the caches to grow. Safety requires different
918 // cache management logic if the caches can grow instead of just
919 // going from NULL to non-NULL.
920 bool idnum_can_increment() const { return has_been_redefined(); }
921 jmethodID* methods_jmethod_ids_acquire() const
922 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
923 void release_set_methods_jmethod_ids(jmethodID* jmeths)
924 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
926 int* methods_cached_itable_indices_acquire() const
927 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
928 void release_set_methods_cached_itable_indices(int* indices)
929 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
931 // Lock during initialization
932 volatile oop init_lock() const;
933 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
934 void fence_and_clear_init_lock(); // after fully_initialized
936 // Offsets for memory management
937 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
938 oop* adr_signers() const { return (oop*)&this->_signers;}
939 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
941 // Static methods that are used to implement member methods where an exposed this pointer
942 // is needed due to possible GCs
943 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
944 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
945 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
946 static void eager_initialize_impl (instanceKlassHandle this_oop);
947 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
948 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
949 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
950 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
951 /* jni_id_for_impl for jfieldID only */
952 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
954 // Returns the array class for the n'th dimension
955 Klass* array_klass_impl(bool or_null, int n, TRAPS);
957 // Returns the array class with this class as element type
958 Klass* array_klass_impl(bool or_null, TRAPS);
960 public:
961 // CDS support - remove and restore oops from metadata. Oops are not shared.
962 virtual void remove_unshareable_info();
963 virtual void restore_unshareable_info(TRAPS);
965 // jvm support
966 jint compute_modifier_flags(TRAPS) const;
968 public:
969 // JVMTI support
970 jint jvmti_class_status() const;
972 public:
973 // Printing
974 #ifndef PRODUCT
975 void print_on(outputStream* st) const;
976 #endif
977 void print_value_on(outputStream* st) const;
979 void oop_print_value_on(oop obj, outputStream* st);
981 #ifndef PRODUCT
982 void oop_print_on (oop obj, outputStream* st);
984 void print_dependent_nmethods(bool verbose = false);
985 bool is_dependent_nmethod(nmethod* nm);
986 #endif
988 const char* internal_name() const;
990 // Verification
991 void verify_on(outputStream* st);
993 void oop_verify_on(oop obj, outputStream* st);
994 };
996 inline Method* InstanceKlass::method_at_vtable(int index) {
997 #ifndef PRODUCT
998 assert(index >= 0, "valid vtable index");
999 if (DebugVtables) {
1000 verify_vtable_index(index);
1001 }
1002 #endif
1003 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1004 return ve[index].method();
1005 }
1007 // for adding methods
1008 // UNSET_IDNUM return means no more ids available
1009 inline u2 InstanceKlass::next_method_idnum() {
1010 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1011 return ConstMethod::UNSET_IDNUM; // no more ids available
1012 } else {
1013 return _idnum_allocated_count++;
1014 }
1015 }
1018 /* JNIid class for jfieldIDs only */
1019 class JNIid: public CHeapObj<mtClass> {
1020 friend class VMStructs;
1021 private:
1022 Klass* _holder;
1023 JNIid* _next;
1024 int _offset;
1025 #ifdef ASSERT
1026 bool _is_static_field_id;
1027 #endif
1029 public:
1030 // Accessors
1031 Klass* holder() const { return _holder; }
1032 int offset() const { return _offset; }
1033 JNIid* next() { return _next; }
1034 // Constructor
1035 JNIid(Klass* holder, int offset, JNIid* next);
1036 // Identifier lookup
1037 JNIid* find(int offset);
1039 bool find_local_field(fieldDescriptor* fd) {
1040 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1041 }
1043 static void deallocate(JNIid* id);
1044 // Debugging
1045 #ifdef ASSERT
1046 bool is_static_field_id() const { return _is_static_field_id; }
1047 void set_is_static_field_id() { _is_static_field_id = true; }
1048 #endif
1049 void verify(Klass* holder);
1050 };
1053 // If breakpoints are more numerous than just JVMTI breakpoints,
1054 // consider compressing this data structure.
1055 // It is currently a simple linked list defined in method.hpp.
1057 class BreakpointInfo;
1060 // A collection point for interesting information about the previous
1061 // version(s) of an InstanceKlass. This class uses weak references to
1062 // the information so that the information may be collected as needed
1063 // by the system. If the information is shared, then a regular
1064 // reference must be used because a weak reference would be seen as
1065 // collectible. A GrowableArray of PreviousVersionNodes is attached
1066 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1067 class PreviousVersionNode : public CHeapObj<mtClass> {
1068 private:
1069 // A shared ConstantPool is never collected so we'll always have
1070 // a reference to it so we can update items in the cache. We'll
1071 // have a weak reference to a non-shared ConstantPool until all
1072 // of the methods (EMCP or obsolete) have been collected; the
1073 // non-shared ConstantPool becomes collectible at that point.
1074 ConstantPool* _prev_constant_pool; // regular or weak reference
1075 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1077 // If the previous version of the InstanceKlass doesn't have any
1078 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1079 // EMCP methods have been collected, then _prev_EMCP_methods can
1080 // have a length of zero.
1081 GrowableArray<Method*>* _prev_EMCP_methods;
1083 public:
1084 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1085 GrowableArray<Method*>* prev_EMCP_methods);
1086 ~PreviousVersionNode();
1087 ConstantPool* prev_constant_pool() const {
1088 return _prev_constant_pool;
1089 }
1090 GrowableArray<Method*>* prev_EMCP_methods() const {
1091 return _prev_EMCP_methods;
1092 }
1093 };
1096 // A Handle-ized version of PreviousVersionNode.
1097 class PreviousVersionInfo : public ResourceObj {
1098 private:
1099 constantPoolHandle _prev_constant_pool_handle;
1100 // If the previous version of the InstanceKlass doesn't have any
1101 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1102 // methods cannot be collected while we hold a handle,
1103 // _prev_EMCP_methods should never have a length of zero.
1104 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1106 public:
1107 PreviousVersionInfo(PreviousVersionNode *pv_node);
1108 ~PreviousVersionInfo();
1109 constantPoolHandle prev_constant_pool_handle() const {
1110 return _prev_constant_pool_handle;
1111 }
1112 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1113 return _prev_EMCP_method_handles;
1114 }
1115 };
1118 // Helper object for walking previous versions. This helper cleans up
1119 // the Handles that it allocates when the helper object is destroyed.
1120 // The PreviousVersionInfo object returned by next_previous_version()
1121 // is only valid until a subsequent call to next_previous_version() or
1122 // the helper object is destroyed.
1123 class PreviousVersionWalker : public StackObj {
1124 private:
1125 GrowableArray<PreviousVersionNode *>* _previous_versions;
1126 int _current_index;
1127 // Fields for cleaning up when we are done walking the previous versions:
1128 // A HandleMark for the PreviousVersionInfo handles:
1129 HandleMark _hm;
1131 // It would be nice to have a ResourceMark field in this helper also,
1132 // but the ResourceMark code says to be careful to delete handles held
1133 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1134 // can't guarantee the order in which the fields are destroyed, we
1135 // have to let the creator of the PreviousVersionWalker object do
1136 // the right thing. Also, adding a ResourceMark here causes an
1137 // include loop.
1139 // A pointer to the current info object so we can handle the deletes.
1140 PreviousVersionInfo * _current_p;
1142 public:
1143 PreviousVersionWalker(InstanceKlass *ik);
1144 ~PreviousVersionWalker();
1146 // Return the interesting information for the next previous version
1147 // of the klass. Returns NULL if there are no more previous versions.
1148 PreviousVersionInfo* next_previous_version();
1149 };
1152 //
1153 // nmethodBucket is used to record dependent nmethods for
1154 // deoptimization. nmethod dependencies are actually <klass, method>
1155 // pairs but we really only care about the klass part for purposes of
1156 // finding nmethods which might need to be deoptimized. Instead of
1157 // recording the method, a count of how many times a particular nmethod
1158 // was recorded is kept. This ensures that any recording errors are
1159 // noticed since an nmethod should be removed as many times are it's
1160 // added.
1161 //
1162 class nmethodBucket: public CHeapObj<mtClass> {
1163 friend class VMStructs;
1164 private:
1165 nmethod* _nmethod;
1166 int _count;
1167 nmethodBucket* _next;
1169 public:
1170 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1171 _nmethod = nmethod;
1172 _next = next;
1173 _count = 1;
1174 }
1175 int count() { return _count; }
1176 int increment() { _count += 1; return _count; }
1177 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1178 nmethodBucket* next() { return _next; }
1179 void set_next(nmethodBucket* b) { _next = b; }
1180 nmethod* get_nmethod() { return _nmethod; }
1181 };
1183 // An iterator that's used to access the inner classes indices in the
1184 // InstanceKlass::_inner_classes array.
1185 class InnerClassesIterator : public StackObj {
1186 private:
1187 Array<jushort>* _inner_classes;
1188 int _length;
1189 int _idx;
1190 public:
1192 InnerClassesIterator(instanceKlassHandle k) {
1193 _inner_classes = k->inner_classes();
1194 if (k->inner_classes() != NULL) {
1195 _length = _inner_classes->length();
1196 // The inner class array's length should be the multiple of
1197 // inner_class_next_offset if it only contains the InnerClasses
1198 // attribute data, or it should be
1199 // n*inner_class_next_offset+enclosing_method_attribute_size
1200 // if it also contains the EnclosingMethod data.
1201 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1202 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1203 "just checking");
1204 // Remove the enclosing_method portion if exists.
1205 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1206 _length -= InstanceKlass::enclosing_method_attribute_size;
1207 }
1208 } else {
1209 _length = 0;
1210 }
1211 _idx = 0;
1212 }
1214 int length() const {
1215 return _length;
1216 }
1218 void next() {
1219 _idx += InstanceKlass::inner_class_next_offset;
1220 }
1222 bool done() const {
1223 return (_idx >= _length);
1224 }
1226 u2 inner_class_info_index() const {
1227 return _inner_classes->at(
1228 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1229 }
1231 void set_inner_class_info_index(u2 index) {
1232 _inner_classes->at_put(
1233 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1234 }
1236 u2 outer_class_info_index() const {
1237 return _inner_classes->at(
1238 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1239 }
1241 void set_outer_class_info_index(u2 index) {
1242 _inner_classes->at_put(
1243 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1244 }
1246 u2 inner_name_index() const {
1247 return _inner_classes->at(
1248 _idx + InstanceKlass::inner_class_inner_name_offset);
1249 }
1251 void set_inner_name_index(u2 index) {
1252 _inner_classes->at_put(
1253 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1254 }
1256 u2 inner_access_flags() const {
1257 return _inner_classes->at(
1258 _idx + InstanceKlass::inner_class_access_flags_offset);
1259 }
1260 };
1262 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP