Wed, 13 Mar 2013 17:34:29 -0400
8003419: NPG: Clean up metadata created during class loading if failure
Summary: Store metadata on ClassFileParser instance to be cleaned up by destructor. This enabled some refactoring of the enormous parseClassFile function.
Reviewed-by: jmasa, acorn
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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
28 #include "classfile/classLoaderData.hpp"
29 #include "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 InstanceKlass* allocate_instance_klass(
151 ClassLoaderData* loader_data,
152 int vtable_len,
153 int itable_len,
154 int static_field_size,
155 int nonstatic_oop_map_size,
156 ReferenceType rt,
157 AccessFlags access_flags,
158 Symbol* name,
159 Klass* super_klass,
160 bool is_anonymous,
161 TRAPS);
163 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
165 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
166 // of the class loading & initialization procedure, and the use of the states.
167 enum ClassState {
168 allocated, // allocated (but not yet linked)
169 loaded, // loaded and inserted in class hierarchy (but not linked yet)
170 linked, // successfully linked/verified (but not initialized yet)
171 being_initialized, // currently running class initializer
172 fully_initialized, // initialized (successfull final state)
173 initialization_error // error happened during initialization
174 };
176 static int number_of_instance_classes() { return _total_instanceKlass_count; }
178 private:
179 static volatile int _total_instanceKlass_count;
181 protected:
182 // Protection domain.
183 oop _protection_domain;
184 // Class signers.
185 objArrayOop _signers;
186 // Initialization lock. Must be one per class and it has to be a VM internal
187 // object so java code cannot lock it (like the mirror)
188 // It has to be an object not a Mutex because it's held through java calls.
189 volatile oop _init_lock;
191 // Annotations for this class
192 Annotations* _annotations;
193 // Array classes holding elements of this class.
194 Klass* _array_klasses;
195 // Constant pool for this class.
196 ConstantPool* _constants;
197 // The InnerClasses attribute and EnclosingMethod attribute. The
198 // _inner_classes is an array of shorts. If the class has InnerClasses
199 // attribute, then the _inner_classes array begins with 4-tuples of shorts
200 // [inner_class_info_index, outer_class_info_index,
201 // inner_name_index, inner_class_access_flags] for the InnerClasses
202 // attribute. If the EnclosingMethod attribute exists, it occupies the
203 // last two shorts [class_index, method_index] of the array. If only
204 // the InnerClasses attribute exists, the _inner_classes array length is
205 // number_of_inner_classes * 4. If the class has both InnerClasses
206 // and EnclosingMethod attributes the _inner_classes array length is
207 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
208 Array<jushort>* _inner_classes;
210 // Name of source file containing this klass, NULL if not specified.
211 Symbol* _source_file_name;
212 // the source debug extension for this klass, NULL if not specified.
213 // Specified as UTF-8 string without terminating zero byte in the classfile,
214 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
215 char* _source_debug_extension;
216 // Generic signature, or null if none.
217 Symbol* _generic_signature;
218 // Array name derived from this class which needs unreferencing
219 // if this class is unloaded.
220 Symbol* _array_name;
222 // Number of heapOopSize words used by non-static fields in this klass
223 // (including inherited fields but after header_size()).
224 int _nonstatic_field_size;
225 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
226 u2 _static_oop_field_count;// number of static oop fields in this klass
227 u2 _java_fields_count; // The number of declared Java fields
228 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
230 // _is_marked_dependent can be set concurrently, thus cannot be part of the
231 // _misc_flags.
232 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 _misc_is_contended = 1 << 4, // marked with contended annotation
240 _misc_has_default_methods = 1 << 5 // class/superclass/implemented interfaces has default methods
241 };
242 u2 _misc_flags;
243 u2 _minor_version; // minor version number of class file
244 u2 _major_version; // major version number of class file
245 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
246 int _vtable_len; // length of Java vtable (in words)
247 int _itable_len; // length of Java itable (in words)
248 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
249 JNIid* _jni_ids; // First JNI identifier for static fields in this class
250 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
251 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
252 nmethodBucket* _dependencies; // list of dependent nmethods
253 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
254 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
255 // Array of interesting part(s) of the previous version(s) of this
256 // InstanceKlass. See PreviousVersionWalker below.
257 GrowableArray<PreviousVersionNode *>* _previous_versions;
258 // JVMTI fields can be moved to their own structure - see 6315920
259 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
260 jint _cached_class_file_len; // JVMTI: length of above
262 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
264 // Class states are defined as ClassState (see above).
265 // Place the _init_state here to utilize the unused 2-byte after
266 // _idnum_allocated_count.
267 u1 _init_state; // state of class
268 u1 _reference_type; // reference type
270 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
272 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
274 // Method array.
275 Array<Method*>* _methods;
276 // Interface (Klass*s) this class declares locally to implement.
277 Array<Klass*>* _local_interfaces;
278 // Interface (Klass*s) this class implements transitively.
279 Array<Klass*>* _transitive_interfaces;
280 // Int array containing the original order of method in the class file (for JVMTI).
281 Array<int>* _method_ordering;
282 // Instance and static variable information, starts with 6-tuples of shorts
283 // [access, name index, sig index, initval index, low_offset, high_offset]
284 // for all fields, followed by the generic signature data at the end of
285 // the array. Only fields with generic signature attributes have the generic
286 // signature data set in the array. The fields array looks like following:
287 //
288 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
289 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
290 // ...
291 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
292 // [generic signature index]
293 // [generic signature index]
294 // ...
295 Array<u2>* _fields;
297 // embedded Java vtable follows here
298 // embedded Java itables follows here
299 // embedded static fields follows here
300 // embedded nonstatic oop-map blocks follows here
301 // embedded implementor of this interface follows here
302 // The embedded implementor only exists if the current klass is an
303 // iterface. The possible values of the implementor fall into following
304 // three cases:
305 // NULL: no implementor.
306 // A Klass* that's not itself: one implementor.
307 // Itsef: more than one implementors.
308 // embedded host klass follows here
309 // The embedded host klass only exists in an anonymous class for
310 // dynamic language support (JSR 292 enabled). The host class grants
311 // its access privileges to this class also. The host class is either
312 // named, or a previously loaded anonymous class. A non-anonymous class
313 // or an anonymous class loaded through normal classloading does not
314 // have this embedded field.
315 //
317 friend class SystemDictionary;
319 public:
320 bool has_nonstatic_fields() const {
321 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
322 }
323 void set_has_nonstatic_fields(bool b) {
324 if (b) {
325 _misc_flags |= _misc_has_nonstatic_fields;
326 } else {
327 _misc_flags &= ~_misc_has_nonstatic_fields;
328 }
329 }
331 // field sizes
332 int nonstatic_field_size() const { return _nonstatic_field_size; }
333 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
335 int static_field_size() const { return _static_field_size; }
336 void set_static_field_size(int size) { _static_field_size = size; }
338 int static_oop_field_count() const { return (int)_static_oop_field_count; }
339 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
341 // Java vtable
342 int vtable_length() const { return _vtable_len; }
343 void set_vtable_length(int len) { _vtable_len = len; }
345 // Java itable
346 int itable_length() const { return _itable_len; }
347 void set_itable_length(int len) { _itable_len = len; }
349 // array klasses
350 Klass* array_klasses() const { return _array_klasses; }
351 void set_array_klasses(Klass* k) { _array_klasses = k; }
353 // methods
354 Array<Method*>* methods() const { return _methods; }
355 void set_methods(Array<Method*>* a) { _methods = a; }
356 Method* method_with_idnum(int idnum);
358 // method ordering
359 Array<int>* method_ordering() const { return _method_ordering; }
360 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
361 void copy_method_ordering(intArray* m, TRAPS);
363 // interfaces
364 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
365 void set_local_interfaces(Array<Klass*>* a) {
366 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
367 _local_interfaces = a; }
369 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
370 void set_transitive_interfaces(Array<Klass*>* a) {
371 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
372 _transitive_interfaces = a;
373 }
375 private:
376 friend class fieldDescriptor;
377 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
379 public:
380 int field_offset (int index) const { return field(index)->offset(); }
381 int field_access_flags(int index) const { return field(index)->access_flags(); }
382 Symbol* field_name (int index) const { return field(index)->name(constants()); }
383 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
385 // Number of Java declared fields
386 int java_fields_count() const { return (int)_java_fields_count; }
388 Array<u2>* fields() const { return _fields; }
389 void set_fields(Array<u2>* f, u2 java_fields_count) {
390 guarantee(_fields == NULL || f == NULL, "Just checking");
391 _fields = f;
392 _java_fields_count = java_fields_count;
393 }
395 // inner classes
396 Array<u2>* inner_classes() const { return _inner_classes; }
397 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
399 enum InnerClassAttributeOffset {
400 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
401 inner_class_inner_class_info_offset = 0,
402 inner_class_outer_class_info_offset = 1,
403 inner_class_inner_name_offset = 2,
404 inner_class_access_flags_offset = 3,
405 inner_class_next_offset = 4
406 };
408 enum EnclosingMethodAttributeOffset {
409 enclosing_method_class_index_offset = 0,
410 enclosing_method_method_index_offset = 1,
411 enclosing_method_attribute_size = 2
412 };
414 // method override check
415 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
417 // package
418 bool is_same_class_package(Klass* class2);
419 bool is_same_class_package(oop classloader2, Symbol* classname2);
420 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
422 // find an enclosing class (defined where original code was, in jvm.cpp!)
423 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
424 instanceKlassHandle self(THREAD, this);
425 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
426 }
427 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
428 bool* inner_is_member, TRAPS);
430 // tell if two classes have the same enclosing class (at package level)
431 bool is_same_package_member(Klass* class2, TRAPS) {
432 instanceKlassHandle self(THREAD, this);
433 return is_same_package_member_impl(self, class2, THREAD);
434 }
435 static bool is_same_package_member_impl(instanceKlassHandle self,
436 Klass* class2, TRAPS);
438 // initialization state
439 bool is_loaded() const { return _init_state >= loaded; }
440 bool is_linked() const { return _init_state >= linked; }
441 bool is_initialized() const { return _init_state == fully_initialized; }
442 bool is_not_initialized() const { return _init_state < being_initialized; }
443 bool is_being_initialized() const { return _init_state == being_initialized; }
444 bool is_in_error_state() const { return _init_state == initialization_error; }
445 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
446 ClassState init_state() { return (ClassState)_init_state; }
447 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
449 // defineClass specified verification
450 bool should_verify_class() const {
451 return (_misc_flags & _misc_should_verify_class) != 0;
452 }
453 void set_should_verify_class(bool value) {
454 if (value) {
455 _misc_flags |= _misc_should_verify_class;
456 } else {
457 _misc_flags &= ~_misc_should_verify_class;
458 }
459 }
461 // marking
462 bool is_marked_dependent() const { return _is_marked_dependent; }
463 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
465 // initialization (virtuals from Klass)
466 bool should_be_initialized() const; // means that initialize should be called
467 void initialize(TRAPS);
468 void link_class(TRAPS);
469 bool link_class_or_fail(TRAPS); // returns false on failure
470 void unlink_class();
471 void rewrite_class(TRAPS);
472 void link_methods(TRAPS);
473 Method* class_initializer();
475 // set the class to initialized if no static initializer is present
476 void eager_initialize(Thread *thread);
478 // reference type
479 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
480 void set_reference_type(ReferenceType t) {
481 assert(t == (u1)t, "overflow");
482 _reference_type = (u1)t;
483 }
485 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
487 // find local field, returns true if found
488 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
489 // find field in direct superinterfaces, returns the interface in which the field is defined
490 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
491 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
492 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
493 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
494 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
496 // find a non-static or static field given its offset within the class.
497 bool contains_field_offset(int offset) {
498 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
499 }
501 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
502 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
504 // find a local method (returns NULL if not found)
505 Method* find_method(Symbol* name, Symbol* signature) const;
506 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
508 // lookup operation (returns NULL if not found)
509 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
511 // lookup a method in all the interfaces that this class implements
512 // (returns NULL if not found)
513 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
515 // Find method indices by name. If a method with the specified name is
516 // found the index to the first method is returned, and 'end' is filled in
517 // with the index of first non-name-matching method. If no method is found
518 // -1 is returned.
519 int find_method_by_name(Symbol* name, int* end);
520 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
522 // constant pool
523 ConstantPool* constants() const { return _constants; }
524 void set_constants(ConstantPool* c) { _constants = c; }
526 // protection domain
527 oop protection_domain() { return _protection_domain; }
528 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
530 // host class
531 Klass* host_klass() const {
532 Klass** hk = (Klass**)adr_host_klass();
533 if (hk == NULL) {
534 return NULL;
535 } else {
536 return *hk;
537 }
538 }
539 void set_host_klass(Klass* host) {
540 assert(is_anonymous(), "not anonymous");
541 Klass** addr = (Klass**)adr_host_klass();
542 assert(addr != NULL, "no reversed space");
543 if (addr != NULL) {
544 *addr = host;
545 }
546 }
547 bool is_anonymous() const {
548 return (_misc_flags & _misc_is_anonymous) != 0;
549 }
550 void set_is_anonymous(bool value) {
551 if (value) {
552 _misc_flags |= _misc_is_anonymous;
553 } else {
554 _misc_flags &= ~_misc_is_anonymous;
555 }
556 }
558 // Oop that keeps the metadata for this class from being unloaded
559 // in places where the metadata is stored in other places, like nmethods
560 oop klass_holder() const {
561 return is_anonymous() ? java_mirror() : class_loader();
562 }
564 bool is_contended() const {
565 return (_misc_flags & _misc_is_contended) != 0;
566 }
567 void set_is_contended(bool value) {
568 if (value) {
569 _misc_flags |= _misc_is_contended;
570 } else {
571 _misc_flags &= ~_misc_is_contended;
572 }
573 }
575 // signers
576 objArrayOop signers() const { return _signers; }
577 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
579 // source file name
580 Symbol* source_file_name() const { return _source_file_name; }
581 void set_source_file_name(Symbol* n);
583 // minor and major version numbers of class file
584 u2 minor_version() const { return _minor_version; }
585 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
586 u2 major_version() const { return _major_version; }
587 void set_major_version(u2 major_version) { _major_version = major_version; }
589 // source debug extension
590 char* source_debug_extension() const { return _source_debug_extension; }
591 void set_source_debug_extension(char* array, int length);
593 // symbol unloading support (refcount already added)
594 Symbol* array_name() { return _array_name; }
595 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
597 // nonstatic oop-map blocks
598 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
599 return oop_map_count * OopMapBlock::size_in_words();
600 }
601 unsigned int nonstatic_oop_map_count() const {
602 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
603 }
604 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
605 void set_nonstatic_oop_map_size(int words) {
606 _nonstatic_oop_map_size = words;
607 }
609 // RedefineClasses() support for previous versions:
610 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
611 int emcp_method_count);
612 // If the _previous_versions array is non-NULL, then this klass
613 // has been redefined at least once even if we aren't currently
614 // tracking a previous version.
615 bool has_been_redefined() const { return _previous_versions != NULL; }
616 bool has_previous_version() const;
617 void init_previous_versions() {
618 _previous_versions = NULL;
619 }
620 GrowableArray<PreviousVersionNode *>* previous_versions() const {
621 return _previous_versions;
622 }
624 static void purge_previous_versions(InstanceKlass* ik);
626 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
627 void set_cached_class_file(unsigned char *class_file_bytes,
628 jint class_file_len) { _cached_class_file_len = class_file_len;
629 _cached_class_file_bytes = class_file_bytes; }
630 jint get_cached_class_file_len() { return _cached_class_file_len; }
631 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
633 // JVMTI: Support for caching of field indices, types, and offsets
634 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
635 _jvmti_cached_class_field_map = descriptor;
636 }
637 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
638 return _jvmti_cached_class_field_map;
639 }
641 bool has_default_methods() const {
642 return (_misc_flags & _misc_has_default_methods) != 0;
643 }
644 void set_has_default_methods(bool b) {
645 if (b) {
646 _misc_flags |= _misc_has_default_methods;
647 } else {
648 _misc_flags &= ~_misc_has_default_methods;
649 }
650 }
652 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
653 inline u2 next_method_idnum();
654 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
656 // generics support
657 Symbol* generic_signature() const { return _generic_signature; }
658 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
660 u2 enclosing_method_data(int offset);
661 u2 enclosing_method_class_index() {
662 return enclosing_method_data(enclosing_method_class_index_offset);
663 }
664 u2 enclosing_method_method_index() {
665 return enclosing_method_data(enclosing_method_method_index_offset);
666 }
667 void set_enclosing_method_indices(u2 class_index,
668 u2 method_index);
670 // jmethodID support
671 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
672 methodHandle method_h);
673 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
674 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
675 jmethodID* to_dealloc_id_p,
676 jmethodID** to_dealloc_jmeths_p);
677 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
678 size_t *length_p, jmethodID* id_p);
679 jmethodID jmethod_id_or_null(Method* method);
681 // cached itable index support
682 void set_cached_itable_index(size_t idnum, int index);
683 int cached_itable_index(size_t idnum);
685 // annotations support
686 Annotations* annotations() const { return _annotations; }
687 void set_annotations(Annotations* anno) { _annotations = anno; }
689 AnnotationArray* class_annotations() const {
690 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
691 }
692 Array<AnnotationArray*>* fields_annotations() const {
693 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
694 }
695 AnnotationArray* class_type_annotations() const {
696 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
697 }
698 Array<AnnotationArray*>* fields_type_annotations() const {
699 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
700 }
701 // allocation
702 instanceOop allocate_instance(TRAPS);
704 // additional member function to return a handle
705 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
707 objArrayOop allocate_objArray(int n, int length, TRAPS);
708 // Helper function
709 static instanceOop register_finalizer(instanceOop i, TRAPS);
711 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
712 // if not, throw either an Error or an Exception.
713 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
715 // initialization
716 void call_class_initializer(TRAPS);
717 void set_initialization_state_and_notify(ClassState state, TRAPS);
719 // OopMapCache support
720 OopMapCache* oop_map_cache() { return _oop_map_cache; }
721 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
722 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
724 // JNI identifier support (for static fields - for jni performance)
725 JNIid* jni_ids() { return _jni_ids; }
726 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
727 JNIid* jni_id_for(int offset);
729 // maintenance of deoptimization dependencies
730 int mark_dependent_nmethods(DepChange& changes);
731 void add_dependent_nmethod(nmethod* nm);
732 void remove_dependent_nmethod(nmethod* nm);
734 // On-stack replacement support
735 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
736 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
737 void add_osr_nmethod(nmethod* n);
738 void remove_osr_nmethod(nmethod* n);
739 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
741 // Breakpoint support (see methods on Method* for details)
742 BreakpointInfo* breakpoints() const { return _breakpoints; };
743 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
745 // support for stub routines
746 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
747 TRACE_DEFINE_OFFSET;
748 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
750 // subclass/subinterface checks
751 bool implements_interface(Klass* k) const;
753 // Access to the implementor of an interface.
754 Klass* implementor() const
755 {
756 Klass** k = adr_implementor();
757 if (k == NULL) {
758 return NULL;
759 } else {
760 return *k;
761 }
762 }
764 void set_implementor(Klass* k) {
765 assert(is_interface(), "not interface");
766 Klass** addr = adr_implementor();
767 assert(addr != NULL, "null addr");
768 if (addr != NULL) {
769 *addr = k;
770 }
771 }
773 int nof_implementors() const {
774 Klass* k = implementor();
775 if (k == NULL) {
776 return 0;
777 } else if (k != this) {
778 return 1;
779 } else {
780 return 2;
781 }
782 }
784 void add_implementor(Klass* k); // k is a new class that implements this interface
785 void init_implementor(); // initialize
787 // link this class into the implementors list of every interface it implements
788 void process_interfaces(Thread *thread);
790 // virtual operations from Klass
791 bool is_leaf_class() const { return _subklass == NULL; }
792 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
793 bool compute_is_subtype_of(Klass* k);
794 bool can_be_primary_super_slow() const;
795 int oop_size(oop obj) const { return size_helper(); }
796 bool oop_is_instance_slow() const { return true; }
798 // Iterators
799 void do_local_static_fields(FieldClosure* cl);
800 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
801 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
803 void methods_do(void f(Method* method));
804 void array_klasses_do(void f(Klass* k));
805 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
806 void with_array_klasses_do(void f(Klass* k));
807 bool super_types_do(SuperTypeClosure* blk);
809 // Casting from Klass*
810 static InstanceKlass* cast(Klass* k) {
811 assert(k->is_klass(), "must be");
812 assert(k->oop_is_instance(), "cast to InstanceKlass");
813 return (InstanceKlass*) k;
814 }
816 InstanceKlass* java_super() const {
817 return (super() == NULL) ? NULL : cast(super());
818 }
820 // Sizing (in words)
821 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
823 static int size(int vtable_length, int itable_length,
824 int nonstatic_oop_map_size,
825 bool is_interface, bool is_anonymous) {
826 return align_object_size(header_size() +
827 align_object_offset(vtable_length) +
828 align_object_offset(itable_length) +
829 ((is_interface || is_anonymous) ?
830 align_object_offset(nonstatic_oop_map_size) :
831 nonstatic_oop_map_size) +
832 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
833 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
834 }
835 int size() const { return size(vtable_length(),
836 itable_length(),
837 nonstatic_oop_map_size(),
838 is_interface(),
839 is_anonymous());
840 }
841 #if INCLUDE_SERVICES
842 virtual void collect_statistics(KlassSizeStats *sz) const;
843 #endif
845 static int vtable_start_offset() { return header_size(); }
846 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
848 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
849 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
850 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
852 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
854 address static_field_addr(int offset);
856 OopMapBlock* start_of_nonstatic_oop_maps() const {
857 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
858 }
860 Klass** end_of_nonstatic_oop_maps() const {
861 return (Klass**)(start_of_nonstatic_oop_maps() +
862 nonstatic_oop_map_count());
863 }
865 Klass** adr_implementor() const {
866 if (is_interface()) {
867 return (Klass**)end_of_nonstatic_oop_maps();
868 } else {
869 return NULL;
870 }
871 };
873 Klass** adr_host_klass() const {
874 if (is_anonymous()) {
875 Klass** adr_impl = adr_implementor();
876 if (adr_impl != NULL) {
877 return adr_impl + 1;
878 } else {
879 return end_of_nonstatic_oop_maps();
880 }
881 } else {
882 return NULL;
883 }
884 }
886 // Allocation profiling support
887 juint alloc_size() const { return _alloc_count * size_helper(); }
888 void set_alloc_size(juint n) {}
890 // Use this to return the size of an instance in heap words:
891 int size_helper() const {
892 return layout_helper_to_size_helper(layout_helper());
893 }
895 // This bit is initialized in classFileParser.cpp.
896 // It is false under any of the following conditions:
897 // - the class is abstract (including any interface)
898 // - the class has a finalizer (if !RegisterFinalizersAtInit)
899 // - the class size is larger than FastAllocateSizeLimit
900 // - the class is java/lang/Class, which cannot be allocated directly
901 bool can_be_fastpath_allocated() const {
902 return !layout_helper_needs_slow_path(layout_helper());
903 }
905 // Java vtable/itable
906 klassVtable* vtable() const; // return new klassVtable wrapper
907 inline Method* method_at_vtable(int index);
908 klassItable* itable() const; // return new klassItable wrapper
909 Method* method_at_itable(Klass* holder, int index, TRAPS);
911 // Garbage collection
912 virtual void oops_do(OopClosure* cl);
914 void oop_follow_contents(oop obj);
915 int oop_adjust_pointers(oop obj);
917 void clean_implementors_list(BoolObjectClosure* is_alive);
918 void clean_method_data(BoolObjectClosure* is_alive);
920 // Explicit metaspace deallocation of fields
921 // For RedefineClasses and class file parsing errors, we need to deallocate
922 // instanceKlasses and the metadata they point to.
923 void deallocate_contents(ClassLoaderData* loader_data);
924 static void deallocate_methods(ClassLoaderData* loader_data,
925 Array<Method*>* methods);
926 void static deallocate_interfaces(ClassLoaderData* loader_data,
927 Klass* super_klass,
928 Array<Klass*>* local_interfaces,
929 Array<Klass*>* transitive_interfaces);
931 // The constant pool is on stack if any of the methods are executing or
932 // referenced by handles.
933 bool on_stack() const { return _constants->on_stack(); }
935 void release_C_heap_structures();
937 // Parallel Scavenge and Parallel Old
938 PARALLEL_GC_DECLS
940 // Naming
941 const char* signature_name() const;
943 // Iterators
944 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
945 return oop_oop_iterate_v(obj, blk);
946 }
948 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
949 return oop_oop_iterate_v_m(obj, blk, mr);
950 }
952 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
953 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
954 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
955 MemRegion mr);
957 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
958 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
960 #if INCLUDE_ALL_GCS
961 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
962 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
964 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
965 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
966 #endif // INCLUDE_ALL_GCS
968 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
969 private:
970 // initialization state
971 #ifdef ASSERT
972 void set_init_state(ClassState state);
973 #else
974 void set_init_state(ClassState state) { _init_state = (u1)state; }
975 #endif
976 void set_rewritten() { _misc_flags |= _misc_rewritten; }
977 void set_init_thread(Thread *thread) { _init_thread = thread; }
979 // The RedefineClasses() API can cause new method idnums to be needed
980 // which will cause the caches to grow. Safety requires different
981 // cache management logic if the caches can grow instead of just
982 // going from NULL to non-NULL.
983 bool idnum_can_increment() const { return has_been_redefined(); }
984 jmethodID* methods_jmethod_ids_acquire() const
985 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
986 void release_set_methods_jmethod_ids(jmethodID* jmeths)
987 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
989 int* methods_cached_itable_indices_acquire() const
990 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
991 void release_set_methods_cached_itable_indices(int* indices)
992 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
994 // Lock during initialization
995 volatile oop init_lock() const;
996 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
997 void fence_and_clear_init_lock(); // after fully_initialized
999 // Offsets for memory management
1000 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
1001 oop* adr_signers() const { return (oop*)&this->_signers;}
1002 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
1004 // Static methods that are used to implement member methods where an exposed this pointer
1005 // is needed due to possible GCs
1006 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1007 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1008 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1009 static void eager_initialize_impl (instanceKlassHandle this_oop);
1010 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1011 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1012 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1013 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
1014 /* jni_id_for_impl for jfieldID only */
1015 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1017 // Returns the array class for the n'th dimension
1018 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1020 // Returns the array class with this class as element type
1021 Klass* array_klass_impl(bool or_null, TRAPS);
1023 public:
1024 // CDS support - remove and restore oops from metadata. Oops are not shared.
1025 virtual void remove_unshareable_info();
1026 virtual void restore_unshareable_info(TRAPS);
1028 // jvm support
1029 jint compute_modifier_flags(TRAPS) const;
1031 public:
1032 // JVMTI support
1033 jint jvmti_class_status() const;
1035 public:
1036 // Printing
1037 #ifndef PRODUCT
1038 void print_on(outputStream* st) const;
1039 #endif
1040 void print_value_on(outputStream* st) const;
1042 void oop_print_value_on(oop obj, outputStream* st);
1044 #ifndef PRODUCT
1045 void oop_print_on (oop obj, outputStream* st);
1047 void print_dependent_nmethods(bool verbose = false);
1048 bool is_dependent_nmethod(nmethod* nm);
1049 #endif
1051 const char* internal_name() const;
1053 // Verification
1054 void verify_on(outputStream* st);
1056 void oop_verify_on(oop obj, outputStream* st);
1057 };
1059 inline Method* InstanceKlass::method_at_vtable(int index) {
1060 #ifndef PRODUCT
1061 assert(index >= 0, "valid vtable index");
1062 if (DebugVtables) {
1063 verify_vtable_index(index);
1064 }
1065 #endif
1066 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1067 return ve[index].method();
1068 }
1070 // for adding methods
1071 // UNSET_IDNUM return means no more ids available
1072 inline u2 InstanceKlass::next_method_idnum() {
1073 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1074 return ConstMethod::UNSET_IDNUM; // no more ids available
1075 } else {
1076 return _idnum_allocated_count++;
1077 }
1078 }
1081 /* JNIid class for jfieldIDs only */
1082 class JNIid: public CHeapObj<mtClass> {
1083 friend class VMStructs;
1084 private:
1085 Klass* _holder;
1086 JNIid* _next;
1087 int _offset;
1088 #ifdef ASSERT
1089 bool _is_static_field_id;
1090 #endif
1092 public:
1093 // Accessors
1094 Klass* holder() const { return _holder; }
1095 int offset() const { return _offset; }
1096 JNIid* next() { return _next; }
1097 // Constructor
1098 JNIid(Klass* holder, int offset, JNIid* next);
1099 // Identifier lookup
1100 JNIid* find(int offset);
1102 bool find_local_field(fieldDescriptor* fd) {
1103 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1104 }
1106 static void deallocate(JNIid* id);
1107 // Debugging
1108 #ifdef ASSERT
1109 bool is_static_field_id() const { return _is_static_field_id; }
1110 void set_is_static_field_id() { _is_static_field_id = true; }
1111 #endif
1112 void verify(Klass* holder);
1113 };
1116 // If breakpoints are more numerous than just JVMTI breakpoints,
1117 // consider compressing this data structure.
1118 // It is currently a simple linked list defined in method.hpp.
1120 class BreakpointInfo;
1123 // A collection point for interesting information about the previous
1124 // version(s) of an InstanceKlass. This class uses weak references to
1125 // the information so that the information may be collected as needed
1126 // by the system. If the information is shared, then a regular
1127 // reference must be used because a weak reference would be seen as
1128 // collectible. A GrowableArray of PreviousVersionNodes is attached
1129 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1130 class PreviousVersionNode : public CHeapObj<mtClass> {
1131 private:
1132 // A shared ConstantPool is never collected so we'll always have
1133 // a reference to it so we can update items in the cache. We'll
1134 // have a weak reference to a non-shared ConstantPool until all
1135 // of the methods (EMCP or obsolete) have been collected; the
1136 // non-shared ConstantPool becomes collectible at that point.
1137 ConstantPool* _prev_constant_pool; // regular or weak reference
1138 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1140 // If the previous version of the InstanceKlass doesn't have any
1141 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1142 // EMCP methods have been collected, then _prev_EMCP_methods can
1143 // have a length of zero.
1144 GrowableArray<Method*>* _prev_EMCP_methods;
1146 public:
1147 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1148 GrowableArray<Method*>* prev_EMCP_methods);
1149 ~PreviousVersionNode();
1150 ConstantPool* prev_constant_pool() const {
1151 return _prev_constant_pool;
1152 }
1153 GrowableArray<Method*>* prev_EMCP_methods() const {
1154 return _prev_EMCP_methods;
1155 }
1156 };
1159 // A Handle-ized version of PreviousVersionNode.
1160 class PreviousVersionInfo : public ResourceObj {
1161 private:
1162 constantPoolHandle _prev_constant_pool_handle;
1163 // If the previous version of the InstanceKlass doesn't have any
1164 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1165 // methods cannot be collected while we hold a handle,
1166 // _prev_EMCP_methods should never have a length of zero.
1167 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1169 public:
1170 PreviousVersionInfo(PreviousVersionNode *pv_node);
1171 ~PreviousVersionInfo();
1172 constantPoolHandle prev_constant_pool_handle() const {
1173 return _prev_constant_pool_handle;
1174 }
1175 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1176 return _prev_EMCP_method_handles;
1177 }
1178 };
1181 // Helper object for walking previous versions. This helper cleans up
1182 // the Handles that it allocates when the helper object is destroyed.
1183 // The PreviousVersionInfo object returned by next_previous_version()
1184 // is only valid until a subsequent call to next_previous_version() or
1185 // the helper object is destroyed.
1186 class PreviousVersionWalker : public StackObj {
1187 private:
1188 GrowableArray<PreviousVersionNode *>* _previous_versions;
1189 int _current_index;
1190 // Fields for cleaning up when we are done walking the previous versions:
1191 // A HandleMark for the PreviousVersionInfo handles:
1192 HandleMark _hm;
1194 // It would be nice to have a ResourceMark field in this helper also,
1195 // but the ResourceMark code says to be careful to delete handles held
1196 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1197 // can't guarantee the order in which the fields are destroyed, we
1198 // have to let the creator of the PreviousVersionWalker object do
1199 // the right thing. Also, adding a ResourceMark here causes an
1200 // include loop.
1202 // A pointer to the current info object so we can handle the deletes.
1203 PreviousVersionInfo * _current_p;
1205 public:
1206 PreviousVersionWalker(InstanceKlass *ik);
1207 ~PreviousVersionWalker();
1209 // Return the interesting information for the next previous version
1210 // of the klass. Returns NULL if there are no more previous versions.
1211 PreviousVersionInfo* next_previous_version();
1212 };
1215 //
1216 // nmethodBucket is used to record dependent nmethods for
1217 // deoptimization. nmethod dependencies are actually <klass, method>
1218 // pairs but we really only care about the klass part for purposes of
1219 // finding nmethods which might need to be deoptimized. Instead of
1220 // recording the method, a count of how many times a particular nmethod
1221 // was recorded is kept. This ensures that any recording errors are
1222 // noticed since an nmethod should be removed as many times are it's
1223 // added.
1224 //
1225 class nmethodBucket: public CHeapObj<mtClass> {
1226 friend class VMStructs;
1227 private:
1228 nmethod* _nmethod;
1229 int _count;
1230 nmethodBucket* _next;
1232 public:
1233 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1234 _nmethod = nmethod;
1235 _next = next;
1236 _count = 1;
1237 }
1238 int count() { return _count; }
1239 int increment() { _count += 1; return _count; }
1240 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1241 nmethodBucket* next() { return _next; }
1242 void set_next(nmethodBucket* b) { _next = b; }
1243 nmethod* get_nmethod() { return _nmethod; }
1244 };
1246 // An iterator that's used to access the inner classes indices in the
1247 // InstanceKlass::_inner_classes array.
1248 class InnerClassesIterator : public StackObj {
1249 private:
1250 Array<jushort>* _inner_classes;
1251 int _length;
1252 int _idx;
1253 public:
1255 InnerClassesIterator(instanceKlassHandle k) {
1256 _inner_classes = k->inner_classes();
1257 if (k->inner_classes() != NULL) {
1258 _length = _inner_classes->length();
1259 // The inner class array's length should be the multiple of
1260 // inner_class_next_offset if it only contains the InnerClasses
1261 // attribute data, or it should be
1262 // n*inner_class_next_offset+enclosing_method_attribute_size
1263 // if it also contains the EnclosingMethod data.
1264 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1265 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1266 "just checking");
1267 // Remove the enclosing_method portion if exists.
1268 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1269 _length -= InstanceKlass::enclosing_method_attribute_size;
1270 }
1271 } else {
1272 _length = 0;
1273 }
1274 _idx = 0;
1275 }
1277 int length() const {
1278 return _length;
1279 }
1281 void next() {
1282 _idx += InstanceKlass::inner_class_next_offset;
1283 }
1285 bool done() const {
1286 return (_idx >= _length);
1287 }
1289 u2 inner_class_info_index() const {
1290 return _inner_classes->at(
1291 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1292 }
1294 void set_inner_class_info_index(u2 index) {
1295 _inner_classes->at_put(
1296 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1297 }
1299 u2 outer_class_info_index() const {
1300 return _inner_classes->at(
1301 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1302 }
1304 void set_outer_class_info_index(u2 index) {
1305 _inner_classes->at_put(
1306 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1307 }
1309 u2 inner_name_index() const {
1310 return _inner_classes->at(
1311 _idx + InstanceKlass::inner_class_inner_name_offset);
1312 }
1314 void set_inner_name_index(u2 index) {
1315 _inner_classes->at_put(
1316 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1317 }
1319 u2 inner_access_flags() const {
1320 return _inner_classes->at(
1321 _idx + InstanceKlass::inner_class_access_flags_offset);
1322 }
1323 };
1325 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP