Wed, 09 May 2012 10:54:29 -0700
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 "oops/constMethodOop.hpp"
29 #include "oops/constantPoolOop.hpp"
30 #include "oops/fieldInfo.hpp"
31 #include "oops/instanceOop.hpp"
32 #include "oops/klassOop.hpp"
33 #include "oops/klassVtable.hpp"
34 #include "oops/objArrayOop.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/os.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/bitMap.inline.hpp"
40 // An instanceKlass is the VM level representation of a Java class.
41 // It contains all information needed for at class at execution runtime.
43 // instanceKlass layout:
44 // [header ] klassOop
45 // [klass pointer ] klassOop
46 // [C++ vtbl pointer ] Klass
47 // [subtype cache ] Klass
48 // [instance size ] Klass
49 // [java mirror ] Klass
50 // [super ] Klass
51 // [access_flags ] Klass
52 // [name ] Klass
53 // [first subklass ] Klass
54 // [next sibling ] Klass
55 // [array klasses ]
56 // [methods ]
57 // [local interfaces ]
58 // [transitive interfaces ]
59 // [fields ]
60 // [constants ]
61 // [class loader ]
62 // [protection domain ]
63 // [signers ]
64 // [source file name ]
65 // [inner classes ]
66 // [static field size ]
67 // [nonstatic field size ]
68 // [static oop fields size ]
69 // [nonstatic oop maps size ]
70 // [has finalize method ]
71 // [deoptimization mark bit ]
72 // [initialization state ]
73 // [initializing thread ]
74 // [Java vtable length ]
75 // [oop map cache (stack maps) ]
76 // [EMBEDDED Java vtable ] size in words = vtable_len
77 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
78 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
79 // indicating where oops are located in instances of this klass.
80 // [EMBEDDED implementor of the interface] only exist for interface
81 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
84 // forward declaration for class -- see below for definition
85 class SuperTypeClosure;
86 class JNIid;
87 class jniIdMapBase;
88 class BreakpointInfo;
89 class fieldDescriptor;
90 class DepChange;
91 class nmethodBucket;
92 class PreviousVersionNode;
93 class JvmtiCachedClassFieldMap;
95 // This is used in iterators below.
96 class FieldClosure: public StackObj {
97 public:
98 virtual void do_field(fieldDescriptor* fd) = 0;
99 };
101 #ifndef PRODUCT
102 // Print fields.
103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
104 class FieldPrinter: public FieldClosure {
105 oop _obj;
106 outputStream* _st;
107 public:
108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
109 void do_field(fieldDescriptor* fd);
110 };
111 #endif // !PRODUCT
113 // ValueObjs embedded in klass. Describes where oops are located in instances of
114 // this klass.
115 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
116 public:
117 // Byte offset of the first oop mapped by this block.
118 int offset() const { return _offset; }
119 void set_offset(int offset) { _offset = offset; }
121 // Number of oops in this block.
122 uint count() const { return _count; }
123 void set_count(uint count) { _count = count; }
125 // sizeof(OopMapBlock) in HeapWords.
126 static const int size_in_words() {
127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
128 LogHeapWordSize;
129 }
131 private:
132 int _offset;
133 uint _count;
134 };
136 class instanceKlass: public Klass {
137 friend class VMStructs;
138 public:
139 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
140 // of the class loading & initialization procedure, and the use of the states.
141 enum ClassState {
142 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
143 allocated, // allocated (but not yet linked)
144 loaded, // loaded and inserted in class hierarchy (but not linked yet)
145 linked, // successfully linked/verified (but not initialized yet)
146 being_initialized, // currently running class initializer
147 fully_initialized, // initialized (successfull final state)
148 initialization_error // error happened during initialization
149 };
151 public:
152 oop* oop_block_beg() const { return adr_array_klasses(); }
153 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
155 protected:
156 //
157 // The oop block. See comment in klass.hpp before making changes.
158 //
160 // Array classes holding elements of this class.
161 klassOop _array_klasses;
162 // Method array.
163 objArrayOop _methods;
164 // Int array containing the original order of method in the class file (for
165 // JVMTI).
166 typeArrayOop _method_ordering;
167 // Interface (klassOops) this class declares locally to implement.
168 objArrayOop _local_interfaces;
169 // Interface (klassOops) this class implements transitively.
170 objArrayOop _transitive_interfaces;
171 // Instance and static variable information, 5-tuples of shorts [access, name
172 // index, sig index, initval index, offset].
173 typeArrayOop _fields;
174 // Constant pool for this class.
175 constantPoolOop _constants;
176 // Class loader used to load this class, NULL if VM loader used.
177 oop _class_loader;
178 // Protection domain.
179 oop _protection_domain;
180 // Class signers.
181 objArrayOop _signers;
182 // The InnerClasses attribute and EnclosingMethod attribute. The
183 // _inner_classes is an array of shorts. If the class has InnerClasses
184 // attribute, then the _inner_classes array begins with 4-tuples of shorts
185 // [inner_class_info_index, outer_class_info_index,
186 // inner_name_index, inner_class_access_flags] for the InnerClasses
187 // attribute. If the EnclosingMethod attribute exists, it occupies the
188 // last two shorts [class_index, method_index] of the array. If only
189 // the InnerClasses attribute exists, the _inner_classes array length is
190 // number_of_inner_classes * 4. If the class has both InnerClasses
191 // and EnclosingMethod attributes the _inner_classes array length is
192 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
193 typeArrayOop _inner_classes;
194 // Annotations for this class, or null if none.
195 typeArrayOop _class_annotations;
196 // Annotation objects (byte arrays) for fields, or null if no annotations.
197 // Indices correspond to entries (not indices) in fields array.
198 objArrayOop _fields_annotations;
199 // Annotation objects (byte arrays) for methods, or null if no annotations.
200 // Index is the idnum, which is initially the same as the methods array index.
201 objArrayOop _methods_annotations;
202 // Annotation objects (byte arrays) for methods' parameters, or null if no
203 // such annotations.
204 // Index is the idnum, which is initially the same as the methods array index.
205 objArrayOop _methods_parameter_annotations;
206 // Annotation objects (byte arrays) for methods' default values, or null if no
207 // such annotations.
208 // Index is the idnum, which is initially the same as the methods array index.
209 objArrayOop _methods_default_annotations;
211 //
212 // End of the oop block.
213 //
215 // Name of source file containing this klass, NULL if not specified.
216 Symbol* _source_file_name;
217 // the source debug extension for this klass, NULL if not specified.
218 Symbol* _source_debug_extension;
219 // Generic signature, or null if none.
220 Symbol* _generic_signature;
221 // Array name derived from this class which needs unreferencing
222 // if this class is unloaded.
223 Symbol* _array_name;
225 // Number of heapOopSize words used by non-static fields in this klass
226 // (including inherited fields but after header_size()).
227 int _nonstatic_field_size;
228 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
229 u2 _static_oop_field_count;// number of static oop fields in this klass
230 u2 _java_fields_count; // The number of declared Java fields
231 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
233 bool _is_marked_dependent; // used for marking during flushing and deoptimization
234 enum {
235 _misc_rewritten = 1 << 0, // methods rewritten.
236 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
237 _misc_should_verify_class = 1 << 2, // allow caching of preverification
238 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field
239 };
240 u2 _misc_flags;
241 u2 _minor_version; // minor version number of class file
242 u2 _major_version; // major version number of class file
243 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
244 int _vtable_len; // length of Java vtable (in words)
245 int _itable_len; // length of Java itable (in words)
246 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
247 JNIid* _jni_ids; // First JNI identifier for static fields in this class
248 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
249 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
250 nmethodBucket* _dependencies; // list of dependent nmethods
251 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
252 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
253 // Array of interesting part(s) of the previous version(s) of this
254 // instanceKlass. See PreviousVersionWalker below.
255 GrowableArray<PreviousVersionNode *>* _previous_versions;
256 // JVMTI fields can be moved to their own structure - see 6315920
257 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
258 jint _cached_class_file_len; // JVMTI: length of above
259 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
260 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
262 // Class states are defined as ClassState (see above).
263 // Place the _init_state here to utilize the unused 2-byte after
264 // _idnum_allocated_count.
265 u1 _init_state; // state of class
267 u1 _reference_type; // reference type
269 // embedded Java vtable follows here
270 // embedded Java itables follows here
271 // embedded static fields follows here
272 // embedded nonstatic oop-map blocks follows here
273 // embedded implementor of this interface follows here
274 // The embedded implementor only exists if the current klass is an
275 // iterface. The possible values of the implementor fall into following
276 // three cases:
277 // NULL: no implementor.
278 // A klassOop that's not itself: one implementor.
279 // Itsef: more than one implementors.
280 // embedded host klass follows here
281 // The embedded host klass only exists in an anonymous class for
282 // dynamic language support (JSR 292 enabled). The host class grants
283 // its access privileges to this class also. The host class is either
284 // named, or a previously loaded anonymous class. A non-anonymous class
285 // or an anonymous class loaded through normal classloading does not
286 // have this embedded field.
287 //
289 friend class instanceKlassKlass;
290 friend class SystemDictionary;
292 public:
293 bool has_nonstatic_fields() const {
294 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
295 }
296 void set_has_nonstatic_fields(bool b) {
297 if (b) {
298 _misc_flags |= _misc_has_nonstatic_fields;
299 } else {
300 _misc_flags &= ~_misc_has_nonstatic_fields;
301 }
302 }
304 // field sizes
305 int nonstatic_field_size() const { return _nonstatic_field_size; }
306 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
308 int static_field_size() const { return _static_field_size; }
309 void set_static_field_size(int size) { _static_field_size = size; }
311 int static_oop_field_count() const { return (int)_static_oop_field_count; }
312 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
314 // Java vtable
315 int vtable_length() const { return _vtable_len; }
316 void set_vtable_length(int len) { _vtable_len = len; }
318 // Java itable
319 int itable_length() const { return _itable_len; }
320 void set_itable_length(int len) { _itable_len = len; }
322 // array klasses
323 klassOop array_klasses() const { return _array_klasses; }
324 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
326 // methods
327 objArrayOop methods() const { return _methods; }
328 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
329 methodOop method_with_idnum(int idnum);
331 // method ordering
332 typeArrayOop method_ordering() const { return _method_ordering; }
333 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
335 // interfaces
336 objArrayOop local_interfaces() const { return _local_interfaces; }
337 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
338 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
339 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
341 private:
342 friend class fieldDescriptor;
343 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
345 public:
346 int field_offset (int index) const { return field(index)->offset(); }
347 int field_access_flags(int index) const { return field(index)->access_flags(); }
348 Symbol* field_name (int index) const { return field(index)->name(constants()); }
349 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
351 // Number of Java declared fields
352 int java_fields_count() const { return (int)_java_fields_count; }
354 // Number of fields including any injected fields
355 int all_fields_count() const { return _fields->length() / FieldInfo::field_slots; }
357 typeArrayOop fields() const { return _fields; }
359 void set_fields(typeArrayOop f, u2 java_fields_count) {
360 oop_store_without_check((oop*) &_fields, (oop) f);
361 _java_fields_count = java_fields_count;
362 }
364 // inner classes
365 typeArrayOop inner_classes() const { return _inner_classes; }
366 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
368 enum InnerClassAttributeOffset {
369 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
370 inner_class_inner_class_info_offset = 0,
371 inner_class_outer_class_info_offset = 1,
372 inner_class_inner_name_offset = 2,
373 inner_class_access_flags_offset = 3,
374 inner_class_next_offset = 4
375 };
377 enum EnclosingMethodAttributeOffset {
378 enclosing_method_class_index_offset = 0,
379 enclosing_method_method_index_offset = 1,
380 enclosing_method_attribute_size = 2
381 };
383 // method override check
384 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
386 // package
387 bool is_same_class_package(klassOop class2);
388 bool is_same_class_package(oop classloader2, Symbol* classname2);
389 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
391 // find an enclosing class (defined where original code was, in jvm.cpp!)
392 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) {
393 instanceKlassHandle self(THREAD, this->as_klassOop());
394 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
395 }
396 static klassOop compute_enclosing_class_impl(instanceKlassHandle self,
397 bool* inner_is_member, TRAPS);
399 // tell if two classes have the same enclosing class (at package level)
400 bool is_same_package_member(klassOop class2, TRAPS) {
401 instanceKlassHandle self(THREAD, this->as_klassOop());
402 return is_same_package_member_impl(self, class2, THREAD);
403 }
404 static bool is_same_package_member_impl(instanceKlassHandle self,
405 klassOop class2, TRAPS);
407 // initialization state
408 bool is_loaded() const { return _init_state >= loaded; }
409 bool is_linked() const { return _init_state >= linked; }
410 bool is_initialized() const { return _init_state == fully_initialized; }
411 bool is_not_initialized() const { return _init_state < being_initialized; }
412 bool is_being_initialized() const { return _init_state == being_initialized; }
413 bool is_in_error_state() const { return _init_state == initialization_error; }
414 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
415 ClassState init_state() { return (ClassState)_init_state; }
416 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
418 // defineClass specified verification
419 bool should_verify_class() const {
420 return (_misc_flags & _misc_should_verify_class) != 0;
421 }
422 void set_should_verify_class(bool value) {
423 if (value) {
424 _misc_flags |= _misc_should_verify_class;
425 } else {
426 _misc_flags &= ~_misc_should_verify_class;
427 }
428 }
430 // marking
431 bool is_marked_dependent() const { return _is_marked_dependent; }
432 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
434 // initialization (virtuals from Klass)
435 bool should_be_initialized() const; // means that initialize should be called
436 void initialize(TRAPS);
437 void link_class(TRAPS);
438 bool link_class_or_fail(TRAPS); // returns false on failure
439 void unlink_class();
440 void rewrite_class(TRAPS);
441 void relocate_and_link_methods(TRAPS);
442 methodOop class_initializer();
444 // set the class to initialized if no static initializer is present
445 void eager_initialize(Thread *thread);
447 // reference type
448 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
449 void set_reference_type(ReferenceType t) {
450 assert(t == (u1)t, "overflow");
451 _reference_type = (u1)t;
452 }
454 static ByteSize reference_type_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _reference_type)); }
456 // find local field, returns true if found
457 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
458 // find field in direct superinterfaces, returns the interface in which the field is defined
459 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
460 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
461 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
462 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
463 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
465 // find a non-static or static field given its offset within the class.
466 bool contains_field_offset(int offset) {
467 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
468 }
470 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
471 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
473 // find a local method (returns NULL if not found)
474 methodOop find_method(Symbol* name, Symbol* signature) const;
475 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature);
477 // lookup operation (returns NULL if not found)
478 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const;
480 // lookup a method in all the interfaces that this class implements
481 // (returns NULL if not found)
482 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
484 // constant pool
485 constantPoolOop constants() const { return _constants; }
486 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
488 // class loader
489 oop class_loader() const { return _class_loader; }
490 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
492 // protection domain
493 oop protection_domain() { return _protection_domain; }
494 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
496 // host class
497 oop host_klass() const {
498 oop* hk = adr_host_klass();
499 if (hk == NULL) {
500 return NULL;
501 } else {
502 return *hk;
503 }
504 }
505 void set_host_klass(oop host) {
506 assert(is_anonymous(), "not anonymous");
507 oop* addr = adr_host_klass();
508 assert(addr != NULL, "no reversed space");
509 oop_store(addr, host);
510 }
511 bool is_anonymous() const {
512 return (_misc_flags & _misc_is_anonymous) != 0;
513 }
514 void set_is_anonymous(bool value) {
515 if (value) {
516 _misc_flags |= _misc_is_anonymous;
517 } else {
518 _misc_flags &= ~_misc_is_anonymous;
519 }
520 }
522 // signers
523 objArrayOop signers() const { return _signers; }
524 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
526 // source file name
527 Symbol* source_file_name() const { return _source_file_name; }
528 void set_source_file_name(Symbol* n);
530 // minor and major version numbers of class file
531 u2 minor_version() const { return _minor_version; }
532 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
533 u2 major_version() const { return _major_version; }
534 void set_major_version(u2 major_version) { _major_version = major_version; }
536 // source debug extension
537 Symbol* source_debug_extension() const { return _source_debug_extension; }
538 void set_source_debug_extension(Symbol* n);
540 // symbol unloading support (refcount already added)
541 Symbol* array_name() { return _array_name; }
542 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
544 // nonstatic oop-map blocks
545 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
546 return oop_map_count * OopMapBlock::size_in_words();
547 }
548 unsigned int nonstatic_oop_map_count() const {
549 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
550 }
551 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
552 void set_nonstatic_oop_map_size(int words) {
553 _nonstatic_oop_map_size = words;
554 }
556 // RedefineClasses() support for previous versions:
557 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
558 int emcp_method_count);
559 // If the _previous_versions array is non-NULL, then this klass
560 // has been redefined at least once even if we aren't currently
561 // tracking a previous version.
562 bool has_been_redefined() const { return _previous_versions != NULL; }
563 bool has_previous_version() const;
564 void init_previous_versions() {
565 _previous_versions = NULL;
566 }
567 GrowableArray<PreviousVersionNode *>* previous_versions() const {
568 return _previous_versions;
569 }
571 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
572 void set_cached_class_file(unsigned char *class_file_bytes,
573 jint class_file_len) { _cached_class_file_len = class_file_len;
574 _cached_class_file_bytes = class_file_bytes; }
575 jint get_cached_class_file_len() { return _cached_class_file_len; }
576 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
578 // JVMTI: Support for caching of field indices, types, and offsets
579 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
580 _jvmti_cached_class_field_map = descriptor;
581 }
582 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
583 return _jvmti_cached_class_field_map;
584 }
586 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
587 inline u2 next_method_idnum();
588 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
590 // generics support
591 Symbol* generic_signature() const { return _generic_signature; }
592 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
594 u2 enclosing_method_data(int offset);
595 u2 enclosing_method_class_index() {
596 return enclosing_method_data(enclosing_method_class_index_offset);
597 }
598 u2 enclosing_method_method_index() {
599 return enclosing_method_data(enclosing_method_method_index_offset);
600 }
601 void set_enclosing_method_indices(u2 class_index,
602 u2 method_index);
604 // jmethodID support
605 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
606 methodHandle method_h);
607 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
608 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
609 jmethodID* to_dealloc_id_p,
610 jmethodID** to_dealloc_jmeths_p);
611 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
612 size_t *length_p, jmethodID* id_p);
613 jmethodID jmethod_id_or_null(methodOop method);
615 // cached itable index support
616 void set_cached_itable_index(size_t idnum, int index);
617 int cached_itable_index(size_t idnum);
619 // annotations support
620 typeArrayOop class_annotations() const { return _class_annotations; }
621 objArrayOop fields_annotations() const { return _fields_annotations; }
622 objArrayOop methods_annotations() const { return _methods_annotations; }
623 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
624 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
625 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
626 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
627 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
628 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
629 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
630 typeArrayOop get_method_annotations_of(int idnum)
631 { return get_method_annotations_from(idnum, _methods_annotations); }
632 typeArrayOop get_method_parameter_annotations_of(int idnum)
633 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
634 typeArrayOop get_method_default_annotations_of(int idnum)
635 { return get_method_annotations_from(idnum, _methods_default_annotations); }
636 void set_method_annotations_of(int idnum, typeArrayOop anno)
637 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
638 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
639 { set_methods_annotations_of(idnum, anno, &_methods_parameter_annotations); }
640 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
641 { set_methods_annotations_of(idnum, anno, &_methods_default_annotations); }
643 // allocation
644 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
645 instanceOop allocate_instance(TRAPS);
646 instanceOop allocate_permanent_instance(TRAPS);
648 // additional member function to return a handle
649 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
651 objArrayOop allocate_objArray(int n, int length, TRAPS);
652 // Helper function
653 static instanceOop register_finalizer(instanceOop i, TRAPS);
655 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
656 // if not, throw either an Error or an Exception.
657 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
659 // initialization
660 void call_class_initializer(TRAPS);
661 void set_initialization_state_and_notify(ClassState state, TRAPS);
663 // OopMapCache support
664 OopMapCache* oop_map_cache() { return _oop_map_cache; }
665 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
666 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
668 // JNI identifier support (for static fields - for jni performance)
669 JNIid* jni_ids() { return _jni_ids; }
670 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
671 JNIid* jni_id_for(int offset);
673 // maintenance of deoptimization dependencies
674 int mark_dependent_nmethods(DepChange& changes);
675 void add_dependent_nmethod(nmethod* nm);
676 void remove_dependent_nmethod(nmethod* nm);
678 // On-stack replacement support
679 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
680 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
681 void add_osr_nmethod(nmethod* n);
682 void remove_osr_nmethod(nmethod* n);
683 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const;
685 // Breakpoint support (see methods on methodOop for details)
686 BreakpointInfo* breakpoints() const { return _breakpoints; };
687 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
689 // support for stub routines
690 static ByteSize init_state_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_state)); }
691 TRACE_DEFINE_OFFSET;
692 static ByteSize init_thread_offset() { return in_ByteSize(sizeof(klassOopDesc) + offset_of(instanceKlass, _init_thread)); }
694 // subclass/subinterface checks
695 bool implements_interface(klassOop k) const;
697 // Access to the implementor of an interface.
698 klassOop implementor() const
699 {
700 klassOop* k = (klassOop*)adr_implementor();
701 if (k == NULL) {
702 return NULL;
703 } else {
704 return *k;
705 }
706 }
708 void set_implementor(klassOop k) {
709 assert(is_interface(), "not interface");
710 oop* addr = adr_implementor();
711 oop_store_without_check(addr, k);
712 }
714 int nof_implementors() const {
715 klassOop k = implementor();
716 if (k == NULL) {
717 return 0;
718 } else if (k != this->as_klassOop()) {
719 return 1;
720 } else {
721 return 2;
722 }
723 }
725 void add_implementor(klassOop k); // k is a new class that implements this interface
726 void init_implementor(); // initialize
728 // link this class into the implementors list of every interface it implements
729 void process_interfaces(Thread *thread);
731 // virtual operations from Klass
732 bool is_leaf_class() const { return _subklass == NULL; }
733 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
734 bool compute_is_subtype_of(klassOop k);
735 bool can_be_primary_super_slow() const;
736 klassOop java_super() const { return super(); }
737 int oop_size(oop obj) const { return size_helper(); }
738 int klass_oop_size() const { return object_size(); }
739 bool oop_is_instance_slow() const { return true; }
741 // Iterators
742 void do_local_static_fields(FieldClosure* cl);
743 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
744 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
746 void methods_do(void f(methodOop method));
747 void array_klasses_do(void f(klassOop k));
748 void with_array_klasses_do(void f(klassOop k));
749 bool super_types_do(SuperTypeClosure* blk);
751 // Casting from klassOop
752 static instanceKlass* cast(klassOop k) {
753 assert(k->is_klass(), "must be");
754 Klass* kp = k->klass_part();
755 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
756 return (instanceKlass*) kp;
757 }
759 // Sizing (in words)
760 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
762 int object_size() const
763 {
764 return object_size(align_object_offset(vtable_length()) +
765 align_object_offset(itable_length()) +
766 ((is_interface() || is_anonymous()) ?
767 align_object_offset(nonstatic_oop_map_size()) :
768 nonstatic_oop_map_size()) +
769 (is_interface() ? (int)sizeof(klassOop)/HeapWordSize : 0) +
770 (is_anonymous() ? (int)sizeof(klassOop)/HeapWordSize : 0));
771 }
772 static int vtable_start_offset() { return header_size(); }
773 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
774 static int object_size(int extra) { return align_object_size(header_size() + extra); }
776 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
777 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
778 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
780 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
782 address static_field_addr(int offset);
784 OopMapBlock* start_of_nonstatic_oop_maps() const {
785 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
786 }
788 oop* adr_implementor() const {
789 if (is_interface()) {
790 return (oop*)(start_of_nonstatic_oop_maps() +
791 nonstatic_oop_map_count());
792 } else {
793 return NULL;
794 }
795 };
797 oop* adr_host_klass() const {
798 if (is_anonymous()) {
799 oop* adr_impl = adr_implementor();
800 if (adr_impl != NULL) {
801 return adr_impl + 1;
802 } else {
803 return (oop*)(start_of_nonstatic_oop_maps() +
804 nonstatic_oop_map_count());
805 }
806 } else {
807 return NULL;
808 }
809 }
811 // Allocation profiling support
812 juint alloc_size() const { return _alloc_count * size_helper(); }
813 void set_alloc_size(juint n) {}
815 // Use this to return the size of an instance in heap words:
816 int size_helper() const {
817 return layout_helper_to_size_helper(layout_helper());
818 }
820 // This bit is initialized in classFileParser.cpp.
821 // It is false under any of the following conditions:
822 // - the class is abstract (including any interface)
823 // - the class has a finalizer (if !RegisterFinalizersAtInit)
824 // - the class size is larger than FastAllocateSizeLimit
825 // - the class is java/lang/Class, which cannot be allocated directly
826 bool can_be_fastpath_allocated() const {
827 return !layout_helper_needs_slow_path(layout_helper());
828 }
830 // Java vtable/itable
831 klassVtable* vtable() const; // return new klassVtable wrapper
832 inline methodOop method_at_vtable(int index);
833 klassItable* itable() const; // return new klassItable wrapper
834 methodOop method_at_itable(klassOop holder, int index, TRAPS);
836 // Garbage collection
837 void oop_follow_contents(oop obj);
838 int oop_adjust_pointers(oop obj);
839 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
840 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
842 void follow_weak_klass_links(
843 BoolObjectClosure* is_alive, OopClosure* keep_alive);
844 void release_C_heap_structures();
846 // Parallel Scavenge and Parallel Old
847 PARALLEL_GC_DECLS
849 // Naming
850 const char* signature_name() const;
852 // Iterators
853 int oop_oop_iterate(oop obj, OopClosure* blk) {
854 return oop_oop_iterate_v(obj, blk);
855 }
857 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
858 return oop_oop_iterate_v_m(obj, blk, mr);
859 }
861 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
862 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
863 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
864 MemRegion mr);
866 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
867 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
869 #ifndef SERIALGC
870 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
871 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
873 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
874 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
875 #endif // !SERIALGC
877 private:
878 // initialization state
879 #ifdef ASSERT
880 void set_init_state(ClassState state);
881 #else
882 void set_init_state(ClassState state) { _init_state = (u1)state; }
883 #endif
884 void set_rewritten() { _misc_flags |= _misc_rewritten; }
885 void set_init_thread(Thread *thread) { _init_thread = thread; }
887 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
888 // The RedefineClasses() API can cause new method idnums to be needed
889 // which will cause the caches to grow. Safety requires different
890 // cache management logic if the caches can grow instead of just
891 // going from NULL to non-NULL.
892 bool idnum_can_increment() const { return has_been_redefined(); }
893 jmethodID* methods_jmethod_ids_acquire() const
894 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
895 void release_set_methods_jmethod_ids(jmethodID* jmeths)
896 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
898 int* methods_cached_itable_indices_acquire() const
899 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
900 void release_set_methods_cached_itable_indices(int* indices)
901 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
903 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
904 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
905 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
907 // Offsets for memory management
908 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
909 oop* adr_methods() const { return (oop*)&this->_methods;}
910 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
911 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
912 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
913 oop* adr_fields() const { return (oop*)&this->_fields;}
914 oop* adr_constants() const { return (oop*)&this->_constants;}
915 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
916 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
917 oop* adr_signers() const { return (oop*)&this->_signers;}
918 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
919 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
920 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
921 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
922 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
923 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
924 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
925 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
927 // Static methods that are used to implement member methods where an exposed this pointer
928 // is needed due to possible GCs
929 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
930 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
931 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
932 static void eager_initialize_impl (instanceKlassHandle this_oop);
933 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
934 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
935 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
936 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
937 /* jni_id_for_impl for jfieldID only */
938 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
940 // Returns the array class for the n'th dimension
941 klassOop array_klass_impl(bool or_null, int n, TRAPS);
943 // Returns the array class with this class as element type
944 klassOop array_klass_impl(bool or_null, TRAPS);
946 public:
947 // sharing support
948 virtual void remove_unshareable_info();
949 virtual void shared_symbols_iterate(SymbolClosure* closure);
951 // jvm support
952 jint compute_modifier_flags(TRAPS) const;
954 public:
955 // JVMTI support
956 jint jvmti_class_status() const;
958 public:
959 // Printing
960 void oop_print_value_on(oop obj, outputStream* st);
961 #ifndef PRODUCT
962 void oop_print_on (oop obj, outputStream* st);
964 void print_dependent_nmethods(bool verbose = false);
965 bool is_dependent_nmethod(nmethod* nm);
966 #endif
968 // Verification
969 const char* internal_name() const;
970 void oop_verify_on(oop obj, outputStream* st);
971 };
973 inline methodOop instanceKlass::method_at_vtable(int index) {
974 #ifndef PRODUCT
975 assert(index >= 0, "valid vtable index");
976 if (DebugVtables) {
977 verify_vtable_index(index);
978 }
979 #endif
980 vtableEntry* ve = (vtableEntry*)start_of_vtable();
981 return ve[index].method();
982 }
984 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
985 if (annos == NULL || annos->length() <= idnum) {
986 return NULL;
987 }
988 return typeArrayOop(annos->obj_at(idnum));
989 }
991 // for adding methods
992 // UNSET_IDNUM return means no more ids available
993 inline u2 instanceKlass::next_method_idnum() {
994 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
995 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
996 } else {
997 return _idnum_allocated_count++;
998 }
999 }
1002 /* JNIid class for jfieldIDs only */
1003 class JNIid: public CHeapObj {
1004 friend class VMStructs;
1005 private:
1006 klassOop _holder;
1007 JNIid* _next;
1008 int _offset;
1009 #ifdef ASSERT
1010 bool _is_static_field_id;
1011 #endif
1013 public:
1014 // Accessors
1015 klassOop holder() const { return _holder; }
1016 int offset() const { return _offset; }
1017 JNIid* next() { return _next; }
1018 // Constructor
1019 JNIid(klassOop holder, int offset, JNIid* next);
1020 // Identifier lookup
1021 JNIid* find(int offset);
1023 bool find_local_field(fieldDescriptor* fd) {
1024 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1025 }
1027 // Garbage collection support
1028 oop* holder_addr() { return (oop*)&_holder; }
1029 void oops_do(OopClosure* f);
1030 static void deallocate(JNIid* id);
1031 // Debugging
1032 #ifdef ASSERT
1033 bool is_static_field_id() const { return _is_static_field_id; }
1034 void set_is_static_field_id() { _is_static_field_id = true; }
1035 #endif
1036 void verify(klassOop holder);
1037 };
1040 // If breakpoints are more numerous than just JVMTI breakpoints,
1041 // consider compressing this data structure.
1042 // It is currently a simple linked list defined in methodOop.hpp.
1044 class BreakpointInfo;
1047 // A collection point for interesting information about the previous
1048 // version(s) of an instanceKlass. This class uses weak references to
1049 // the information so that the information may be collected as needed
1050 // by the system. If the information is shared, then a regular
1051 // reference must be used because a weak reference would be seen as
1052 // collectible. A GrowableArray of PreviousVersionNodes is attached
1053 // to the instanceKlass as needed. See PreviousVersionWalker below.
1054 class PreviousVersionNode : public CHeapObj {
1055 private:
1056 // A shared ConstantPool is never collected so we'll always have
1057 // a reference to it so we can update items in the cache. We'll
1058 // have a weak reference to a non-shared ConstantPool until all
1059 // of the methods (EMCP or obsolete) have been collected; the
1060 // non-shared ConstantPool becomes collectible at that point.
1061 jobject _prev_constant_pool; // regular or weak reference
1062 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1064 // If the previous version of the instanceKlass doesn't have any
1065 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1066 // EMCP methods have been collected, then _prev_EMCP_methods can
1067 // have a length of zero.
1068 GrowableArray<jweak>* _prev_EMCP_methods;
1070 public:
1071 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
1072 GrowableArray<jweak>* prev_EMCP_methods);
1073 ~PreviousVersionNode();
1074 jobject prev_constant_pool() const {
1075 return _prev_constant_pool;
1076 }
1077 GrowableArray<jweak>* prev_EMCP_methods() const {
1078 return _prev_EMCP_methods;
1079 }
1080 };
1083 // A Handle-ized version of PreviousVersionNode.
1084 class PreviousVersionInfo : public ResourceObj {
1085 private:
1086 constantPoolHandle _prev_constant_pool_handle;
1087 // If the previous version of the instanceKlass doesn't have any
1088 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1089 // methods cannot be collected while we hold a handle,
1090 // _prev_EMCP_methods should never have a length of zero.
1091 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1093 public:
1094 PreviousVersionInfo(PreviousVersionNode *pv_node);
1095 ~PreviousVersionInfo();
1096 constantPoolHandle prev_constant_pool_handle() const {
1097 return _prev_constant_pool_handle;
1098 }
1099 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1100 return _prev_EMCP_method_handles;
1101 }
1102 };
1105 // Helper object for walking previous versions. This helper cleans up
1106 // the Handles that it allocates when the helper object is destroyed.
1107 // The PreviousVersionInfo object returned by next_previous_version()
1108 // is only valid until a subsequent call to next_previous_version() or
1109 // the helper object is destroyed.
1110 class PreviousVersionWalker : public StackObj {
1111 private:
1112 GrowableArray<PreviousVersionNode *>* _previous_versions;
1113 int _current_index;
1114 // Fields for cleaning up when we are done walking the previous versions:
1115 // A HandleMark for the PreviousVersionInfo handles:
1116 HandleMark _hm;
1118 // It would be nice to have a ResourceMark field in this helper also,
1119 // but the ResourceMark code says to be careful to delete handles held
1120 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1121 // can't guarantee the order in which the fields are destroyed, we
1122 // have to let the creator of the PreviousVersionWalker object do
1123 // the right thing. Also, adding a ResourceMark here causes an
1124 // include loop.
1126 // A pointer to the current info object so we can handle the deletes.
1127 PreviousVersionInfo * _current_p;
1129 public:
1130 PreviousVersionWalker(instanceKlass *ik);
1131 ~PreviousVersionWalker();
1133 // Return the interesting information for the next previous version
1134 // of the klass. Returns NULL if there are no more previous versions.
1135 PreviousVersionInfo* next_previous_version();
1136 };
1139 //
1140 // nmethodBucket is used to record dependent nmethods for
1141 // deoptimization. nmethod dependencies are actually <klass, method>
1142 // pairs but we really only care about the klass part for purposes of
1143 // finding nmethods which might need to be deoptimized. Instead of
1144 // recording the method, a count of how many times a particular nmethod
1145 // was recorded is kept. This ensures that any recording errors are
1146 // noticed since an nmethod should be removed as many times are it's
1147 // added.
1148 //
1149 class nmethodBucket: public CHeapObj {
1150 friend class VMStructs;
1151 private:
1152 nmethod* _nmethod;
1153 int _count;
1154 nmethodBucket* _next;
1156 public:
1157 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1158 _nmethod = nmethod;
1159 _next = next;
1160 _count = 1;
1161 }
1162 int count() { return _count; }
1163 int increment() { _count += 1; return _count; }
1164 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1165 nmethodBucket* next() { return _next; }
1166 void set_next(nmethodBucket* b) { _next = b; }
1167 nmethod* get_nmethod() { return _nmethod; }
1168 };
1170 // An iterator that's used to access the inner classes indices in the
1171 // instanceKlass::_inner_classes array.
1172 class InnerClassesIterator : public StackObj {
1173 private:
1174 typeArrayHandle _inner_classes;
1175 int _length;
1176 int _idx;
1177 public:
1179 InnerClassesIterator(instanceKlassHandle k) {
1180 _inner_classes = k->inner_classes();
1181 if (k->inner_classes() != NULL) {
1182 _length = _inner_classes->length();
1183 // The inner class array's length should be the multiple of
1184 // inner_class_next_offset if it only contains the InnerClasses
1185 // attribute data, or it should be
1186 // n*inner_class_next_offset+enclosing_method_attribute_size
1187 // if it also contains the EnclosingMethod data.
1188 assert((_length % instanceKlass::inner_class_next_offset == 0 ||
1189 _length % instanceKlass::inner_class_next_offset == instanceKlass::enclosing_method_attribute_size),
1190 "just checking");
1191 // Remove the enclosing_method portion if exists.
1192 if (_length % instanceKlass::inner_class_next_offset == instanceKlass::enclosing_method_attribute_size) {
1193 _length -= instanceKlass::enclosing_method_attribute_size;
1194 }
1195 } else {
1196 _length = 0;
1197 }
1198 _idx = 0;
1199 }
1201 int length() const {
1202 return _length;
1203 }
1205 void next() {
1206 _idx += instanceKlass::inner_class_next_offset;
1207 }
1209 bool done() const {
1210 return (_idx >= _length);
1211 }
1213 u2 inner_class_info_index() const {
1214 return _inner_classes->ushort_at(
1215 _idx + instanceKlass::inner_class_inner_class_info_offset);
1216 }
1218 void set_inner_class_info_index(u2 index) {
1219 _inner_classes->ushort_at_put(
1220 _idx + instanceKlass::inner_class_inner_class_info_offset, index);
1221 }
1223 u2 outer_class_info_index() const {
1224 return _inner_classes->ushort_at(
1225 _idx + instanceKlass::inner_class_outer_class_info_offset);
1226 }
1228 void set_outer_class_info_index(u2 index) {
1229 _inner_classes->ushort_at_put(
1230 _idx + instanceKlass::inner_class_outer_class_info_offset, index);
1231 }
1233 u2 inner_name_index() const {
1234 return _inner_classes->ushort_at(
1235 _idx + instanceKlass::inner_class_inner_name_offset);
1236 }
1238 void set_inner_name_index(u2 index) {
1239 _inner_classes->ushort_at_put(
1240 _idx + instanceKlass::inner_class_inner_name_offset, index);
1241 }
1243 u2 inner_access_flags() const {
1244 return _inner_classes->ushort_at(
1245 _idx + instanceKlass::inner_class_access_flags_offset);
1246 }
1247 };
1249 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP