Thu, 07 Feb 2013 16:05:48 -0500
Merge
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.
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/atomic.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/os.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/bitMap.inline.hpp"
39 #include "utilities/macros.hpp"
41 // An InstanceKlass is the VM level representation of a Java class.
42 // It contains all information needed for at class at execution runtime.
44 // InstanceKlass layout:
45 // [C++ vtbl pointer ] Klass
46 // [subtype cache ] Klass
47 // [instance size ] Klass
48 // [java mirror ] Klass
49 // [super ] Klass
50 // [access_flags ] Klass
51 // [name ] Klass
52 // [first subklass ] Klass
53 // [next sibling ] Klass
54 // [array klasses ]
55 // [methods ]
56 // [local interfaces ]
57 // [transitive interfaces ]
58 // [fields ]
59 // [constants ]
60 // [class loader ]
61 // [protection domain ]
62 // [signers ]
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;
94 // This is used in iterators below.
95 class FieldClosure: public StackObj {
96 public:
97 virtual void do_field(fieldDescriptor* fd) = 0;
98 };
100 #ifndef PRODUCT
101 // Print fields.
102 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
103 class FieldPrinter: public FieldClosure {
104 oop _obj;
105 outputStream* _st;
106 public:
107 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
108 void do_field(fieldDescriptor* fd);
109 };
110 #endif // !PRODUCT
112 // ValueObjs embedded in klass. Describes where oops are located in instances of
113 // this klass.
114 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
115 public:
116 // Byte offset of the first oop mapped by this block.
117 int offset() const { return _offset; }
118 void set_offset(int offset) { _offset = offset; }
120 // Number of oops in this block.
121 uint count() const { return _count; }
122 void set_count(uint count) { _count = count; }
124 // sizeof(OopMapBlock) in HeapWords.
125 static const int size_in_words() {
126 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
127 LogHeapWordSize;
128 }
130 private:
131 int _offset;
132 uint _count;
133 };
135 class InstanceKlass: public Klass {
136 friend class VMStructs;
137 friend class ClassFileParser;
138 friend class CompileReplay;
140 protected:
141 // Constructor
142 InstanceKlass(int vtable_len,
143 int itable_len,
144 int static_field_size,
145 int nonstatic_oop_map_size,
146 ReferenceType rt,
147 AccessFlags access_flags,
148 bool is_anonymous);
149 public:
150 static Klass* allocate_instance_klass(ClassLoaderData* loader_data,
151 int vtable_len,
152 int itable_len,
153 int static_field_size,
154 int nonstatic_oop_map_size,
155 ReferenceType rt,
156 AccessFlags access_flags,
157 Symbol* name,
158 Klass* super_klass,
159 KlassHandle host_klass,
160 TRAPS);
162 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
164 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
165 // of the class loading & initialization procedure, and the use of the states.
166 enum ClassState {
167 allocated, // allocated (but not yet linked)
168 loaded, // loaded and inserted in class hierarchy (but not linked yet)
169 linked, // successfully linked/verified (but not initialized yet)
170 being_initialized, // currently running class initializer
171 fully_initialized, // initialized (successfull final state)
172 initialization_error // error happened during initialization
173 };
175 static int number_of_instance_classes() { return _total_instanceKlass_count; }
177 private:
178 static volatile int _total_instanceKlass_count;
180 protected:
181 // Protection domain.
182 oop _protection_domain;
183 // Class signers.
184 objArrayOop _signers;
185 // Initialization lock. Must be one per class and it has to be a VM internal
186 // object so java code cannot lock it (like the mirror)
187 // It has to be an object not a Mutex because it's held through java calls.
188 volatile oop _init_lock;
190 // Annotations for this class
191 Annotations* _annotations;
192 // Array classes holding elements of this class.
193 Klass* _array_klasses;
194 // Constant pool for this class.
195 ConstantPool* _constants;
196 // The InnerClasses attribute and EnclosingMethod attribute. The
197 // _inner_classes is an array of shorts. If the class has InnerClasses
198 // attribute, then the _inner_classes array begins with 4-tuples of shorts
199 // [inner_class_info_index, outer_class_info_index,
200 // inner_name_index, inner_class_access_flags] for the InnerClasses
201 // attribute. If the EnclosingMethod attribute exists, it occupies the
202 // last two shorts [class_index, method_index] of the array. If only
203 // the InnerClasses attribute exists, the _inner_classes array length is
204 // number_of_inner_classes * 4. If the class has both InnerClasses
205 // and EnclosingMethod attributes the _inner_classes array length is
206 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
207 Array<jushort>* _inner_classes;
209 // Name of source file containing this klass, NULL if not specified.
210 Symbol* _source_file_name;
211 // the source debug extension for this klass, NULL if not specified.
212 // Specified as UTF-8 string without terminating zero byte in the classfile,
213 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
214 char* _source_debug_extension;
215 // Generic signature, or null if none.
216 Symbol* _generic_signature;
217 // Array name derived from this class which needs unreferencing
218 // if this class is unloaded.
219 Symbol* _array_name;
221 // Number of heapOopSize words used by non-static fields in this klass
222 // (including inherited fields but after header_size()).
223 int _nonstatic_field_size;
224 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
225 u2 _static_oop_field_count;// number of static oop fields in this klass
226 u2 _java_fields_count; // The number of declared Java fields
227 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
229 // _is_marked_dependent can be set concurrently, thus cannot be part of the
230 // _misc_flags.
231 bool _is_marked_dependent; // used for marking during flushing and deoptimization
233 enum {
234 _misc_rewritten = 1 << 0, // methods rewritten.
235 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
236 _misc_should_verify_class = 1 << 2, // allow caching of preverification
237 _misc_is_anonymous = 1 << 3, // has embedded _inner_classes field
238 _misc_is_contended = 1 << 4, // marked with contended annotation
239 _misc_has_default_methods = 1 << 5 // class/superclass/implemented interfaces has default methods
240 };
241 u2 _misc_flags;
242 u2 _minor_version; // minor version number of class file
243 u2 _major_version; // major version number of class file
244 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
245 int _vtable_len; // length of Java vtable (in words)
246 int _itable_len; // length of Java itable (in words)
247 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
248 JNIid* _jni_ids; // First JNI identifier for static fields in this class
249 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
250 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
251 nmethodBucket* _dependencies; // list of dependent nmethods
252 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
253 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
254 // Array of interesting part(s) of the previous version(s) of this
255 // InstanceKlass. See PreviousVersionWalker below.
256 GrowableArray<PreviousVersionNode *>* _previous_versions;
257 // JVMTI fields can be moved to their own structure - see 6315920
258 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
259 jint _cached_class_file_len; // JVMTI: length of above
261 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
263 // Class states are defined as ClassState (see above).
264 // Place the _init_state here to utilize the unused 2-byte after
265 // _idnum_allocated_count.
266 u1 _init_state; // state of class
267 u1 _reference_type; // reference type
270 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
272 // Method array.
273 Array<Method*>* _methods;
274 // Interface (Klass*s) this class declares locally to implement.
275 Array<Klass*>* _local_interfaces;
276 // Interface (Klass*s) this class implements transitively.
277 Array<Klass*>* _transitive_interfaces;
278 // Int array containing the original order of method in the class file (for JVMTI).
279 Array<int>* _method_ordering;
280 // Instance and static variable information, starts with 6-tuples of shorts
281 // [access, name index, sig index, initval index, low_offset, high_offset]
282 // for all fields, followed by the generic signature data at the end of
283 // the array. Only fields with generic signature attributes have the generic
284 // signature data set in the array. The fields array looks like following:
285 //
286 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
287 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
288 // ...
289 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
290 // [generic signature index]
291 // [generic signature index]
292 // ...
293 Array<u2>* _fields;
295 // embedded Java vtable follows here
296 // embedded Java itables follows here
297 // embedded static fields follows here
298 // embedded nonstatic oop-map blocks follows here
299 // embedded implementor of this interface follows here
300 // The embedded implementor only exists if the current klass is an
301 // iterface. The possible values of the implementor fall into following
302 // three cases:
303 // NULL: no implementor.
304 // A Klass* that's not itself: one implementor.
305 // Itsef: more than one implementors.
306 // embedded host klass follows here
307 // The embedded host klass only exists in an anonymous class for
308 // dynamic language support (JSR 292 enabled). The host class grants
309 // its access privileges to this class also. The host class is either
310 // named, or a previously loaded anonymous class. A non-anonymous class
311 // or an anonymous class loaded through normal classloading does not
312 // have this embedded field.
313 //
315 friend class SystemDictionary;
317 public:
318 bool has_nonstatic_fields() const {
319 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
320 }
321 void set_has_nonstatic_fields(bool b) {
322 if (b) {
323 _misc_flags |= _misc_has_nonstatic_fields;
324 } else {
325 _misc_flags &= ~_misc_has_nonstatic_fields;
326 }
327 }
329 // field sizes
330 int nonstatic_field_size() const { return _nonstatic_field_size; }
331 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
333 int static_field_size() const { return _static_field_size; }
334 void set_static_field_size(int size) { _static_field_size = size; }
336 int static_oop_field_count() const { return (int)_static_oop_field_count; }
337 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
339 // Java vtable
340 int vtable_length() const { return _vtable_len; }
341 void set_vtable_length(int len) { _vtable_len = len; }
343 // Java itable
344 int itable_length() const { return _itable_len; }
345 void set_itable_length(int len) { _itable_len = len; }
347 // array klasses
348 Klass* array_klasses() const { return _array_klasses; }
349 void set_array_klasses(Klass* k) { _array_klasses = k; }
351 // methods
352 Array<Method*>* methods() const { return _methods; }
353 void set_methods(Array<Method*>* a) { _methods = a; }
354 Method* method_with_idnum(int idnum);
356 // method ordering
357 Array<int>* method_ordering() const { return _method_ordering; }
358 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
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; }
365 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
366 void set_transitive_interfaces(Array<Klass*>* a) {
367 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
368 _transitive_interfaces = a; }
370 private:
371 friend class fieldDescriptor;
372 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
374 public:
375 int field_offset (int index) const { return field(index)->offset(); }
376 int field_access_flags(int index) const { return field(index)->access_flags(); }
377 Symbol* field_name (int index) const { return field(index)->name(constants()); }
378 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
380 // Number of Java declared fields
381 int java_fields_count() const { return (int)_java_fields_count; }
383 Array<u2>* fields() const { return _fields; }
385 void set_fields(Array<u2>* f, u2 java_fields_count) {
386 guarantee(_fields == NULL || f == NULL, "Just checking");
387 _fields = f;
388 _java_fields_count = java_fields_count;
389 }
391 // inner classes
392 Array<u2>* inner_classes() const { return _inner_classes; }
393 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
395 enum InnerClassAttributeOffset {
396 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
397 inner_class_inner_class_info_offset = 0,
398 inner_class_outer_class_info_offset = 1,
399 inner_class_inner_name_offset = 2,
400 inner_class_access_flags_offset = 3,
401 inner_class_next_offset = 4
402 };
404 enum EnclosingMethodAttributeOffset {
405 enclosing_method_class_index_offset = 0,
406 enclosing_method_method_index_offset = 1,
407 enclosing_method_attribute_size = 2
408 };
410 // method override check
411 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
413 // package
414 bool is_same_class_package(Klass* class2);
415 bool is_same_class_package(oop classloader2, Symbol* classname2);
416 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
418 // find an enclosing class (defined where original code was, in jvm.cpp!)
419 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
420 instanceKlassHandle self(THREAD, this);
421 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
422 }
423 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
424 bool* inner_is_member, TRAPS);
426 // tell if two classes have the same enclosing class (at package level)
427 bool is_same_package_member(Klass* class2, TRAPS) {
428 instanceKlassHandle self(THREAD, this);
429 return is_same_package_member_impl(self, class2, THREAD);
430 }
431 static bool is_same_package_member_impl(instanceKlassHandle self,
432 Klass* class2, TRAPS);
434 // initialization state
435 bool is_loaded() const { return _init_state >= loaded; }
436 bool is_linked() const { return _init_state >= linked; }
437 bool is_initialized() const { return _init_state == fully_initialized; }
438 bool is_not_initialized() const { return _init_state < being_initialized; }
439 bool is_being_initialized() const { return _init_state == being_initialized; }
440 bool is_in_error_state() const { return _init_state == initialization_error; }
441 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
442 ClassState init_state() { return (ClassState)_init_state; }
443 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
445 // defineClass specified verification
446 bool should_verify_class() const {
447 return (_misc_flags & _misc_should_verify_class) != 0;
448 }
449 void set_should_verify_class(bool value) {
450 if (value) {
451 _misc_flags |= _misc_should_verify_class;
452 } else {
453 _misc_flags &= ~_misc_should_verify_class;
454 }
455 }
457 // marking
458 bool is_marked_dependent() const { return _is_marked_dependent; }
459 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
461 // initialization (virtuals from Klass)
462 bool should_be_initialized() const; // means that initialize should be called
463 void initialize(TRAPS);
464 void link_class(TRAPS);
465 bool link_class_or_fail(TRAPS); // returns false on failure
466 void unlink_class();
467 void rewrite_class(TRAPS);
468 void link_methods(TRAPS);
469 Method* class_initializer();
471 // set the class to initialized if no static initializer is present
472 void eager_initialize(Thread *thread);
474 // reference type
475 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
476 void set_reference_type(ReferenceType t) {
477 assert(t == (u1)t, "overflow");
478 _reference_type = (u1)t;
479 }
481 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
483 // find local field, returns true if found
484 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
485 // find field in direct superinterfaces, returns the interface in which the field is defined
486 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
487 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
488 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
489 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
490 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
492 // find a non-static or static field given its offset within the class.
493 bool contains_field_offset(int offset) {
494 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
495 }
497 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
498 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
500 // find a local method (returns NULL if not found)
501 Method* find_method(Symbol* name, Symbol* signature) const;
502 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
504 // lookup operation (returns NULL if not found)
505 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
507 // lookup a method in all the interfaces that this class implements
508 // (returns NULL if not found)
509 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
511 // Find method indices by name. If a method with the specified name is
512 // found the index to the first method is returned, and 'end' is filled in
513 // with the index of first non-name-matching method. If no method is found
514 // -1 is returned.
515 int find_method_by_name(Symbol* name, int* end);
516 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
518 // constant pool
519 ConstantPool* constants() const { return _constants; }
520 void set_constants(ConstantPool* c) { _constants = c; }
522 // protection domain
523 oop protection_domain() { return _protection_domain; }
524 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
526 // host class
527 Klass* host_klass() const {
528 Klass** hk = (Klass**)adr_host_klass();
529 if (hk == NULL) {
530 return NULL;
531 } else {
532 return *hk;
533 }
534 }
535 void set_host_klass(Klass* host) {
536 assert(is_anonymous(), "not anonymous");
537 Klass** addr = (Klass**)adr_host_klass();
538 assert(addr != NULL, "no reversed space");
539 *addr = host;
540 }
541 bool is_anonymous() const {
542 return (_misc_flags & _misc_is_anonymous) != 0;
543 }
544 void set_is_anonymous(bool value) {
545 if (value) {
546 _misc_flags |= _misc_is_anonymous;
547 } else {
548 _misc_flags &= ~_misc_is_anonymous;
549 }
550 }
552 // Oop that keeps the metadata for this class from being unloaded
553 // in places where the metadata is stored in other places, like nmethods
554 oop klass_holder() const {
555 return is_anonymous() ? java_mirror() : class_loader();
556 }
558 bool is_contended() const {
559 return (_misc_flags & _misc_is_contended) != 0;
560 }
561 void set_is_contended(bool value) {
562 if (value) {
563 _misc_flags |= _misc_is_contended;
564 } else {
565 _misc_flags &= ~_misc_is_contended;
566 }
567 }
569 // signers
570 objArrayOop signers() const { return _signers; }
571 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
573 // source file name
574 Symbol* source_file_name() const { return _source_file_name; }
575 void set_source_file_name(Symbol* n);
577 // minor and major version numbers of class file
578 u2 minor_version() const { return _minor_version; }
579 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
580 u2 major_version() const { return _major_version; }
581 void set_major_version(u2 major_version) { _major_version = major_version; }
583 // source debug extension
584 char* source_debug_extension() const { return _source_debug_extension; }
585 void set_source_debug_extension(char* array, int length);
587 // symbol unloading support (refcount already added)
588 Symbol* array_name() { return _array_name; }
589 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
591 // nonstatic oop-map blocks
592 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
593 return oop_map_count * OopMapBlock::size_in_words();
594 }
595 unsigned int nonstatic_oop_map_count() const {
596 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
597 }
598 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
599 void set_nonstatic_oop_map_size(int words) {
600 _nonstatic_oop_map_size = words;
601 }
603 // RedefineClasses() support for previous versions:
604 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
605 int emcp_method_count);
606 // If the _previous_versions array is non-NULL, then this klass
607 // has been redefined at least once even if we aren't currently
608 // tracking a previous version.
609 bool has_been_redefined() const { return _previous_versions != NULL; }
610 bool has_previous_version() const;
611 void init_previous_versions() {
612 _previous_versions = NULL;
613 }
614 GrowableArray<PreviousVersionNode *>* previous_versions() const {
615 return _previous_versions;
616 }
618 static void purge_previous_versions(InstanceKlass* ik);
620 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
621 void set_cached_class_file(unsigned char *class_file_bytes,
622 jint class_file_len) { _cached_class_file_len = class_file_len;
623 _cached_class_file_bytes = class_file_bytes; }
624 jint get_cached_class_file_len() { return _cached_class_file_len; }
625 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
627 // JVMTI: Support for caching of field indices, types, and offsets
628 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
629 _jvmti_cached_class_field_map = descriptor;
630 }
631 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
632 return _jvmti_cached_class_field_map;
633 }
635 bool has_default_methods() const {
636 return (_misc_flags & _misc_has_default_methods) != 0;
637 }
638 void set_has_default_methods(bool b) {
639 if (b) {
640 _misc_flags |= _misc_has_default_methods;
641 } else {
642 _misc_flags &= ~_misc_has_default_methods;
643 }
644 }
646 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
647 inline u2 next_method_idnum();
648 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
650 // generics support
651 Symbol* generic_signature() const { return _generic_signature; }
652 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
654 u2 enclosing_method_data(int offset);
655 u2 enclosing_method_class_index() {
656 return enclosing_method_data(enclosing_method_class_index_offset);
657 }
658 u2 enclosing_method_method_index() {
659 return enclosing_method_data(enclosing_method_method_index_offset);
660 }
661 void set_enclosing_method_indices(u2 class_index,
662 u2 method_index);
664 // jmethodID support
665 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
666 methodHandle method_h);
667 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
668 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
669 jmethodID* to_dealloc_id_p,
670 jmethodID** to_dealloc_jmeths_p);
671 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
672 size_t *length_p, jmethodID* id_p);
673 jmethodID jmethod_id_or_null(Method* method);
675 // cached itable index support
676 void set_cached_itable_index(size_t idnum, int index);
677 int cached_itable_index(size_t idnum);
679 // annotations support
680 Annotations* annotations() const { return _annotations; }
681 void set_annotations(Annotations* anno) { _annotations = anno; }
682 AnnotationArray* class_annotations() const {
683 if (annotations() == NULL) return NULL;
684 return annotations()->class_annotations();
685 }
686 Array<AnnotationArray*>* fields_annotations() const {
687 if (annotations() == NULL) return NULL;
688 return annotations()->fields_annotations();
689 }
690 Annotations* type_annotations() const {
691 if (annotations() == NULL) return NULL;
692 return annotations()->type_annotations();
693 }
695 // allocation
696 instanceOop allocate_instance(TRAPS);
698 // additional member function to return a handle
699 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
701 objArrayOop allocate_objArray(int n, int length, TRAPS);
702 // Helper function
703 static instanceOop register_finalizer(instanceOop i, TRAPS);
705 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
706 // if not, throw either an Error or an Exception.
707 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
709 // initialization
710 void call_class_initializer(TRAPS);
711 void set_initialization_state_and_notify(ClassState state, TRAPS);
713 // OopMapCache support
714 OopMapCache* oop_map_cache() { return _oop_map_cache; }
715 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
716 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
718 // JNI identifier support (for static fields - for jni performance)
719 JNIid* jni_ids() { return _jni_ids; }
720 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
721 JNIid* jni_id_for(int offset);
723 // maintenance of deoptimization dependencies
724 int mark_dependent_nmethods(DepChange& changes);
725 void add_dependent_nmethod(nmethod* nm);
726 void remove_dependent_nmethod(nmethod* nm);
728 // On-stack replacement support
729 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
730 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
731 void add_osr_nmethod(nmethod* n);
732 void remove_osr_nmethod(nmethod* n);
733 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
735 // Breakpoint support (see methods on Method* for details)
736 BreakpointInfo* breakpoints() const { return _breakpoints; };
737 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
739 // support for stub routines
740 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
741 TRACE_DEFINE_OFFSET;
742 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
744 // subclass/subinterface checks
745 bool implements_interface(Klass* k) const;
747 // Access to the implementor of an interface.
748 Klass* implementor() const
749 {
750 Klass** k = adr_implementor();
751 if (k == NULL) {
752 return NULL;
753 } else {
754 return *k;
755 }
756 }
758 void set_implementor(Klass* k) {
759 assert(is_interface(), "not interface");
760 Klass** addr = adr_implementor();
761 *addr = k;
762 }
764 int nof_implementors() const {
765 Klass* k = implementor();
766 if (k == NULL) {
767 return 0;
768 } else if (k != this) {
769 return 1;
770 } else {
771 return 2;
772 }
773 }
775 void add_implementor(Klass* k); // k is a new class that implements this interface
776 void init_implementor(); // initialize
778 // link this class into the implementors list of every interface it implements
779 void process_interfaces(Thread *thread);
781 // virtual operations from Klass
782 bool is_leaf_class() const { return _subklass == NULL; }
783 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
784 bool compute_is_subtype_of(Klass* k);
785 bool can_be_primary_super_slow() const;
786 int oop_size(oop obj) const { return size_helper(); }
787 bool oop_is_instance_slow() const { return true; }
789 // Iterators
790 void do_local_static_fields(FieldClosure* cl);
791 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
792 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
794 void methods_do(void f(Method* method));
795 void array_klasses_do(void f(Klass* k));
796 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
797 void with_array_klasses_do(void f(Klass* k));
798 bool super_types_do(SuperTypeClosure* blk);
800 // Casting from Klass*
801 static InstanceKlass* cast(Klass* k) {
802 assert(k->is_klass(), "must be");
803 assert(k->oop_is_instance(), "cast to InstanceKlass");
804 return (InstanceKlass*) k;
805 }
807 InstanceKlass* java_super() const {
808 return (super() == NULL) ? NULL : cast(super());
809 }
811 // Sizing (in words)
812 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
813 static int size(int vtable_length, int itable_length,
814 int nonstatic_oop_map_size,
815 bool is_interface, bool is_anonymous) {
816 return align_object_size(header_size() +
817 align_object_offset(vtable_length) +
818 align_object_offset(itable_length) +
819 ((is_interface || is_anonymous) ?
820 align_object_offset(nonstatic_oop_map_size) :
821 nonstatic_oop_map_size) +
822 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
823 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
824 }
825 int size() const { return size(vtable_length(),
826 itable_length(),
827 nonstatic_oop_map_size(),
828 is_interface(),
829 is_anonymous());
830 }
831 #if INCLUDE_SERVICES
832 virtual void collect_statistics(KlassSizeStats *sz) const;
833 #endif
835 static int vtable_start_offset() { return header_size(); }
836 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
838 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
839 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
840 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
842 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
844 address static_field_addr(int offset);
846 OopMapBlock* start_of_nonstatic_oop_maps() const {
847 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
848 }
850 Klass** adr_implementor() const {
851 if (is_interface()) {
852 return (Klass**)(start_of_nonstatic_oop_maps() +
853 nonstatic_oop_map_count());
854 } else {
855 return NULL;
856 }
857 };
859 Klass** adr_host_klass() const {
860 if (is_anonymous()) {
861 Klass** adr_impl = adr_implementor();
862 if (adr_impl != NULL) {
863 return adr_impl + 1;
864 } else {
865 return (Klass**)(start_of_nonstatic_oop_maps() +
866 nonstatic_oop_map_count());
867 }
868 } else {
869 return NULL;
870 }
871 }
873 // Allocation profiling support
874 juint alloc_size() const { return _alloc_count * size_helper(); }
875 void set_alloc_size(juint n) {}
877 // Use this to return the size of an instance in heap words:
878 int size_helper() const {
879 return layout_helper_to_size_helper(layout_helper());
880 }
882 // This bit is initialized in classFileParser.cpp.
883 // It is false under any of the following conditions:
884 // - the class is abstract (including any interface)
885 // - the class has a finalizer (if !RegisterFinalizersAtInit)
886 // - the class size is larger than FastAllocateSizeLimit
887 // - the class is java/lang/Class, which cannot be allocated directly
888 bool can_be_fastpath_allocated() const {
889 return !layout_helper_needs_slow_path(layout_helper());
890 }
892 // Java vtable/itable
893 klassVtable* vtable() const; // return new klassVtable wrapper
894 inline Method* method_at_vtable(int index);
895 klassItable* itable() const; // return new klassItable wrapper
896 Method* method_at_itable(Klass* holder, int index, TRAPS);
898 // Garbage collection
899 virtual void oops_do(OopClosure* cl);
901 void oop_follow_contents(oop obj);
902 int oop_adjust_pointers(oop obj);
904 void clean_implementors_list(BoolObjectClosure* is_alive);
905 void clean_method_data(BoolObjectClosure* is_alive);
907 // Explicit metaspace deallocation of fields
908 // For RedefineClasses, we need to deallocate instanceKlasses
909 void deallocate_contents(ClassLoaderData* loader_data);
911 // The constant pool is on stack if any of the methods are executing or
912 // referenced by handles.
913 bool on_stack() const { return _constants->on_stack(); }
915 void release_C_heap_structures();
917 // Parallel Scavenge and Parallel Old
918 PARALLEL_GC_DECLS
920 // Naming
921 const char* signature_name() const;
923 // Iterators
924 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
925 return oop_oop_iterate_v(obj, blk);
926 }
928 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
929 return oop_oop_iterate_v_m(obj, blk, mr);
930 }
932 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
933 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
934 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
935 MemRegion mr);
937 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
938 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
940 #if INCLUDE_ALL_GCS
941 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
942 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
944 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
945 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
946 #endif // INCLUDE_ALL_GCS
948 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
949 private:
950 // initialization state
951 #ifdef ASSERT
952 void set_init_state(ClassState state);
953 #else
954 void set_init_state(ClassState state) { _init_state = (u1)state; }
955 #endif
956 void set_rewritten() { _misc_flags |= _misc_rewritten; }
957 void set_init_thread(Thread *thread) { _init_thread = thread; }
959 // The RedefineClasses() API can cause new method idnums to be needed
960 // which will cause the caches to grow. Safety requires different
961 // cache management logic if the caches can grow instead of just
962 // going from NULL to non-NULL.
963 bool idnum_can_increment() const { return has_been_redefined(); }
964 jmethodID* methods_jmethod_ids_acquire() const
965 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
966 void release_set_methods_jmethod_ids(jmethodID* jmeths)
967 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
969 int* methods_cached_itable_indices_acquire() const
970 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
971 void release_set_methods_cached_itable_indices(int* indices)
972 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
974 // Lock during initialization
975 volatile oop init_lock() const;
976 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
977 void fence_and_clear_init_lock(); // after fully_initialized
979 // Offsets for memory management
980 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
981 oop* adr_signers() const { return (oop*)&this->_signers;}
982 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
984 // Static methods that are used to implement member methods where an exposed this pointer
985 // is needed due to possible GCs
986 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
987 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
988 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
989 static void eager_initialize_impl (instanceKlassHandle this_oop);
990 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
991 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
992 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
993 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
994 /* jni_id_for_impl for jfieldID only */
995 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
997 // Returns the array class for the n'th dimension
998 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1000 // Returns the array class with this class as element type
1001 Klass* array_klass_impl(bool or_null, TRAPS);
1003 public:
1004 // CDS support - remove and restore oops from metadata. Oops are not shared.
1005 virtual void remove_unshareable_info();
1006 virtual void restore_unshareable_info(TRAPS);
1008 // jvm support
1009 jint compute_modifier_flags(TRAPS) const;
1011 public:
1012 // JVMTI support
1013 jint jvmti_class_status() const;
1015 public:
1016 // Printing
1017 #ifndef PRODUCT
1018 void print_on(outputStream* st) const;
1019 #endif
1020 void print_value_on(outputStream* st) const;
1022 void oop_print_value_on(oop obj, outputStream* st);
1024 #ifndef PRODUCT
1025 void oop_print_on (oop obj, outputStream* st);
1027 void print_dependent_nmethods(bool verbose = false);
1028 bool is_dependent_nmethod(nmethod* nm);
1029 #endif
1031 const char* internal_name() const;
1033 // Verification
1034 void verify_on(outputStream* st);
1036 void oop_verify_on(oop obj, outputStream* st);
1037 };
1039 inline Method* InstanceKlass::method_at_vtable(int index) {
1040 #ifndef PRODUCT
1041 assert(index >= 0, "valid vtable index");
1042 if (DebugVtables) {
1043 verify_vtable_index(index);
1044 }
1045 #endif
1046 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1047 return ve[index].method();
1048 }
1050 // for adding methods
1051 // UNSET_IDNUM return means no more ids available
1052 inline u2 InstanceKlass::next_method_idnum() {
1053 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1054 return ConstMethod::UNSET_IDNUM; // no more ids available
1055 } else {
1056 return _idnum_allocated_count++;
1057 }
1058 }
1061 /* JNIid class for jfieldIDs only */
1062 class JNIid: public CHeapObj<mtClass> {
1063 friend class VMStructs;
1064 private:
1065 Klass* _holder;
1066 JNIid* _next;
1067 int _offset;
1068 #ifdef ASSERT
1069 bool _is_static_field_id;
1070 #endif
1072 public:
1073 // Accessors
1074 Klass* holder() const { return _holder; }
1075 int offset() const { return _offset; }
1076 JNIid* next() { return _next; }
1077 // Constructor
1078 JNIid(Klass* holder, int offset, JNIid* next);
1079 // Identifier lookup
1080 JNIid* find(int offset);
1082 bool find_local_field(fieldDescriptor* fd) {
1083 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1084 }
1086 static void deallocate(JNIid* id);
1087 // Debugging
1088 #ifdef ASSERT
1089 bool is_static_field_id() const { return _is_static_field_id; }
1090 void set_is_static_field_id() { _is_static_field_id = true; }
1091 #endif
1092 void verify(Klass* holder);
1093 };
1096 // If breakpoints are more numerous than just JVMTI breakpoints,
1097 // consider compressing this data structure.
1098 // It is currently a simple linked list defined in method.hpp.
1100 class BreakpointInfo;
1103 // A collection point for interesting information about the previous
1104 // version(s) of an InstanceKlass. This class uses weak references to
1105 // the information so that the information may be collected as needed
1106 // by the system. If the information is shared, then a regular
1107 // reference must be used because a weak reference would be seen as
1108 // collectible. A GrowableArray of PreviousVersionNodes is attached
1109 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1110 class PreviousVersionNode : public CHeapObj<mtClass> {
1111 private:
1112 // A shared ConstantPool is never collected so we'll always have
1113 // a reference to it so we can update items in the cache. We'll
1114 // have a weak reference to a non-shared ConstantPool until all
1115 // of the methods (EMCP or obsolete) have been collected; the
1116 // non-shared ConstantPool becomes collectible at that point.
1117 ConstantPool* _prev_constant_pool; // regular or weak reference
1118 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1120 // If the previous version of the InstanceKlass doesn't have any
1121 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1122 // EMCP methods have been collected, then _prev_EMCP_methods can
1123 // have a length of zero.
1124 GrowableArray<Method*>* _prev_EMCP_methods;
1126 public:
1127 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1128 GrowableArray<Method*>* prev_EMCP_methods);
1129 ~PreviousVersionNode();
1130 ConstantPool* prev_constant_pool() const {
1131 return _prev_constant_pool;
1132 }
1133 GrowableArray<Method*>* prev_EMCP_methods() const {
1134 return _prev_EMCP_methods;
1135 }
1136 };
1139 // A Handle-ized version of PreviousVersionNode.
1140 class PreviousVersionInfo : public ResourceObj {
1141 private:
1142 constantPoolHandle _prev_constant_pool_handle;
1143 // If the previous version of the InstanceKlass doesn't have any
1144 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1145 // methods cannot be collected while we hold a handle,
1146 // _prev_EMCP_methods should never have a length of zero.
1147 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1149 public:
1150 PreviousVersionInfo(PreviousVersionNode *pv_node);
1151 ~PreviousVersionInfo();
1152 constantPoolHandle prev_constant_pool_handle() const {
1153 return _prev_constant_pool_handle;
1154 }
1155 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1156 return _prev_EMCP_method_handles;
1157 }
1158 };
1161 // Helper object for walking previous versions. This helper cleans up
1162 // the Handles that it allocates when the helper object is destroyed.
1163 // The PreviousVersionInfo object returned by next_previous_version()
1164 // is only valid until a subsequent call to next_previous_version() or
1165 // the helper object is destroyed.
1166 class PreviousVersionWalker : public StackObj {
1167 private:
1168 GrowableArray<PreviousVersionNode *>* _previous_versions;
1169 int _current_index;
1170 // Fields for cleaning up when we are done walking the previous versions:
1171 // A HandleMark for the PreviousVersionInfo handles:
1172 HandleMark _hm;
1174 // It would be nice to have a ResourceMark field in this helper also,
1175 // but the ResourceMark code says to be careful to delete handles held
1176 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1177 // can't guarantee the order in which the fields are destroyed, we
1178 // have to let the creator of the PreviousVersionWalker object do
1179 // the right thing. Also, adding a ResourceMark here causes an
1180 // include loop.
1182 // A pointer to the current info object so we can handle the deletes.
1183 PreviousVersionInfo * _current_p;
1185 public:
1186 PreviousVersionWalker(InstanceKlass *ik);
1187 ~PreviousVersionWalker();
1189 // Return the interesting information for the next previous version
1190 // of the klass. Returns NULL if there are no more previous versions.
1191 PreviousVersionInfo* next_previous_version();
1192 };
1195 //
1196 // nmethodBucket is used to record dependent nmethods for
1197 // deoptimization. nmethod dependencies are actually <klass, method>
1198 // pairs but we really only care about the klass part for purposes of
1199 // finding nmethods which might need to be deoptimized. Instead of
1200 // recording the method, a count of how many times a particular nmethod
1201 // was recorded is kept. This ensures that any recording errors are
1202 // noticed since an nmethod should be removed as many times are it's
1203 // added.
1204 //
1205 class nmethodBucket: public CHeapObj<mtClass> {
1206 friend class VMStructs;
1207 private:
1208 nmethod* _nmethod;
1209 int _count;
1210 nmethodBucket* _next;
1212 public:
1213 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1214 _nmethod = nmethod;
1215 _next = next;
1216 _count = 1;
1217 }
1218 int count() { return _count; }
1219 int increment() { _count += 1; return _count; }
1220 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1221 nmethodBucket* next() { return _next; }
1222 void set_next(nmethodBucket* b) { _next = b; }
1223 nmethod* get_nmethod() { return _nmethod; }
1224 };
1226 // An iterator that's used to access the inner classes indices in the
1227 // InstanceKlass::_inner_classes array.
1228 class InnerClassesIterator : public StackObj {
1229 private:
1230 Array<jushort>* _inner_classes;
1231 int _length;
1232 int _idx;
1233 public:
1235 InnerClassesIterator(instanceKlassHandle k) {
1236 _inner_classes = k->inner_classes();
1237 if (k->inner_classes() != NULL) {
1238 _length = _inner_classes->length();
1239 // The inner class array's length should be the multiple of
1240 // inner_class_next_offset if it only contains the InnerClasses
1241 // attribute data, or it should be
1242 // n*inner_class_next_offset+enclosing_method_attribute_size
1243 // if it also contains the EnclosingMethod data.
1244 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1245 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1246 "just checking");
1247 // Remove the enclosing_method portion if exists.
1248 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1249 _length -= InstanceKlass::enclosing_method_attribute_size;
1250 }
1251 } else {
1252 _length = 0;
1253 }
1254 _idx = 0;
1255 }
1257 int length() const {
1258 return _length;
1259 }
1261 void next() {
1262 _idx += InstanceKlass::inner_class_next_offset;
1263 }
1265 bool done() const {
1266 return (_idx >= _length);
1267 }
1269 u2 inner_class_info_index() const {
1270 return _inner_classes->at(
1271 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1272 }
1274 void set_inner_class_info_index(u2 index) {
1275 _inner_classes->at_put(
1276 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1277 }
1279 u2 outer_class_info_index() const {
1280 return _inner_classes->at(
1281 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1282 }
1284 void set_outer_class_info_index(u2 index) {
1285 _inner_classes->at_put(
1286 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1287 }
1289 u2 inner_name_index() const {
1290 return _inner_classes->at(
1291 _idx + InstanceKlass::inner_class_inner_name_offset);
1292 }
1294 void set_inner_name_index(u2 index) {
1295 _inner_classes->at_put(
1296 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1297 }
1299 u2 inner_access_flags() const {
1300 return _inner_classes->at(
1301 _idx + InstanceKlass::inner_class_access_flags_offset);
1302 }
1303 };
1305 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP