Wed, 01 May 2013 08:07:59 -0700
8013418: assert(i == total_args_passed) in AdapterHandlerLibrary::get_adapter since 8-b87
Summary: Do not treat static methods as miranda methods.
Reviewed-by: dholmes, 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.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
28 #include "classfile/classLoaderData.hpp"
29 #include "oops/annotations.hpp"
30 #include "oops/constMethod.hpp"
31 #include "oops/fieldInfo.hpp"
32 #include "oops/instanceOop.hpp"
33 #include "oops/klassVtable.hpp"
34 #include "runtime/atomic.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/os.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/bitMap.inline.hpp"
39 #include "utilities/macros.hpp"
41 // An InstanceKlass is the VM level representation of a Java class.
42 // It contains all information needed for at class at execution runtime.
44 // InstanceKlass layout:
45 // [C++ vtbl pointer ] Klass
46 // [subtype cache ] Klass
47 // [instance size ] Klass
48 // [java mirror ] Klass
49 // [super ] Klass
50 // [access_flags ] Klass
51 // [name ] Klass
52 // [first subklass ] Klass
53 // [next sibling ] Klass
54 // [array klasses ]
55 // [methods ]
56 // [local interfaces ]
57 // [transitive interfaces ]
58 // [fields ]
59 // [constants ]
60 // [class loader ]
61 // [protection domain ]
62 // [signers ]
63 // [source file name ]
64 // [inner classes ]
65 // [static field size ]
66 // [nonstatic field size ]
67 // [static oop fields size ]
68 // [nonstatic oop maps size ]
69 // [has finalize method ]
70 // [deoptimization mark bit ]
71 // [initialization state ]
72 // [initializing thread ]
73 // [Java vtable length ]
74 // [oop map cache (stack maps) ]
75 // [EMBEDDED Java vtable ] size in words = vtable_len
76 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
77 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
78 // indicating where oops are located in instances of this klass.
79 // [EMBEDDED implementor of the interface] only exist for interface
80 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
83 // forward declaration for class -- see below for definition
84 class SuperTypeClosure;
85 class JNIid;
86 class jniIdMapBase;
87 class BreakpointInfo;
88 class fieldDescriptor;
89 class DepChange;
90 class nmethodBucket;
91 class PreviousVersionNode;
92 class JvmtiCachedClassFieldMap;
93 class MemberNameTable;
95 // This is used in iterators below.
96 class FieldClosure: public StackObj {
97 public:
98 virtual void do_field(fieldDescriptor* fd) = 0;
99 };
101 #ifndef PRODUCT
102 // Print fields.
103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
104 class FieldPrinter: public FieldClosure {
105 oop _obj;
106 outputStream* _st;
107 public:
108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
109 void do_field(fieldDescriptor* fd);
110 };
111 #endif // !PRODUCT
113 // ValueObjs embedded in klass. Describes where oops are located in instances of
114 // this klass.
115 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
116 public:
117 // Byte offset of the first oop mapped by this block.
118 int offset() const { return _offset; }
119 void set_offset(int offset) { _offset = offset; }
121 // Number of oops in this block.
122 uint count() const { return _count; }
123 void set_count(uint count) { _count = count; }
125 // sizeof(OopMapBlock) in HeapWords.
126 static const int size_in_words() {
127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
128 LogHeapWordSize;
129 }
131 private:
132 int _offset;
133 uint _count;
134 };
136 class InstanceKlass: public Klass {
137 friend class VMStructs;
138 friend class ClassFileParser;
139 friend class CompileReplay;
141 protected:
142 // Constructor
143 InstanceKlass(int vtable_len,
144 int itable_len,
145 int static_field_size,
146 int nonstatic_oop_map_size,
147 ReferenceType rt,
148 AccessFlags access_flags,
149 bool is_anonymous);
150 public:
151 static InstanceKlass* allocate_instance_klass(
152 ClassLoaderData* loader_data,
153 int vtable_len,
154 int itable_len,
155 int static_field_size,
156 int nonstatic_oop_map_size,
157 ReferenceType rt,
158 AccessFlags access_flags,
159 Symbol* name,
160 Klass* super_klass,
161 bool is_anonymous,
162 TRAPS);
164 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
166 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
167 // of the class loading & initialization procedure, and the use of the states.
168 enum ClassState {
169 allocated, // allocated (but not yet linked)
170 loaded, // loaded and inserted in class hierarchy (but not linked yet)
171 linked, // successfully linked/verified (but not initialized yet)
172 being_initialized, // currently running class initializer
173 fully_initialized, // initialized (successfull final state)
174 initialization_error // error happened during initialization
175 };
177 static int number_of_instance_classes() { return _total_instanceKlass_count; }
179 private:
180 static volatile int _total_instanceKlass_count;
182 protected:
183 // Protection domain.
184 oop _protection_domain;
185 // Class signers.
186 objArrayOop _signers;
187 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
188 // Must be one per class and it has to be a VM internal object so java code
189 // cannot lock it (like the mirror).
190 // It has to be an object not a Mutex because it's held through java calls.
191 volatile oop _init_lock;
193 // Annotations for this class
194 Annotations* _annotations;
195 // Array classes holding elements of this class.
196 Klass* _array_klasses;
197 // Constant pool for this class.
198 ConstantPool* _constants;
199 // The InnerClasses attribute and EnclosingMethod attribute. The
200 // _inner_classes is an array of shorts. If the class has InnerClasses
201 // attribute, then the _inner_classes array begins with 4-tuples of shorts
202 // [inner_class_info_index, outer_class_info_index,
203 // inner_name_index, inner_class_access_flags] for the InnerClasses
204 // attribute. If the EnclosingMethod attribute exists, it occupies the
205 // last two shorts [class_index, method_index] of the array. If only
206 // the InnerClasses attribute exists, the _inner_classes array length is
207 // number_of_inner_classes * 4. If the class has both InnerClasses
208 // and EnclosingMethod attributes the _inner_classes array length is
209 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
210 Array<jushort>* _inner_classes;
212 // Name of source file containing this klass, NULL if not specified.
213 Symbol* _source_file_name;
214 // the source debug extension for this klass, NULL if not specified.
215 // Specified as UTF-8 string without terminating zero byte in the classfile,
216 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
217 char* _source_debug_extension;
218 // Generic signature, or null if none.
219 Symbol* _generic_signature;
220 // Array name derived from this class which needs unreferencing
221 // if this class is unloaded.
222 Symbol* _array_name;
224 // Number of heapOopSize words used by non-static fields in this klass
225 // (including inherited fields but after header_size()).
226 int _nonstatic_field_size;
227 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
228 u2 _static_oop_field_count;// number of static oop fields in this klass
229 u2 _java_fields_count; // The number of declared Java fields
230 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
232 // _is_marked_dependent can be set concurrently, thus cannot be part of the
233 // _misc_flags.
234 bool _is_marked_dependent; // used for marking during flushing and deoptimization
236 enum {
237 _misc_rewritten = 1 << 0, // methods rewritten.
238 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
239 _misc_should_verify_class = 1 << 2, // allow caching of preverification
240 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
241 _misc_is_contended = 1 << 4, // marked with contended annotation
242 _misc_has_default_methods = 1 << 5 // class/superclass/implemented interfaces has default methods
243 };
244 u2 _misc_flags;
245 u2 _minor_version; // minor version number of class file
246 u2 _major_version; // major version number of class file
247 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
248 int _vtable_len; // length of Java vtable (in words)
249 int _itable_len; // length of Java itable (in words)
250 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
251 MemberNameTable* _member_names; // Member names
252 JNIid* _jni_ids; // First JNI identifier for static fields in this class
253 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
254 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
255 nmethodBucket* _dependencies; // list of dependent nmethods
256 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
257 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
258 // Array of interesting part(s) of the previous version(s) of this
259 // InstanceKlass. See PreviousVersionWalker below.
260 GrowableArray<PreviousVersionNode *>* _previous_versions;
261 // JVMTI fields can be moved to their own structure - see 6315920
262 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
263 jint _cached_class_file_len; // JVMTI: length of above
265 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
267 // Class states are defined as ClassState (see above).
268 // Place the _init_state here to utilize the unused 2-byte after
269 // _idnum_allocated_count.
270 u1 _init_state; // state of class
271 u1 _reference_type; // reference type
273 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
275 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
277 // Method array.
278 Array<Method*>* _methods;
279 // Interface (Klass*s) this class declares locally to implement.
280 Array<Klass*>* _local_interfaces;
281 // Interface (Klass*s) this class implements transitively.
282 Array<Klass*>* _transitive_interfaces;
283 // Int array containing the original order of method in the class file (for JVMTI).
284 Array<int>* _method_ordering;
285 // Instance and static variable information, starts with 6-tuples of shorts
286 // [access, name index, sig index, initval index, low_offset, high_offset]
287 // for all fields, followed by the generic signature data at the end of
288 // the array. Only fields with generic signature attributes have the generic
289 // signature data set in the array. The fields array looks like following:
290 //
291 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
292 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
293 // ...
294 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
295 // [generic signature index]
296 // [generic signature index]
297 // ...
298 Array<u2>* _fields;
300 // embedded Java vtable follows here
301 // embedded Java itables follows here
302 // embedded static fields follows here
303 // embedded nonstatic oop-map blocks follows here
304 // embedded implementor of this interface follows here
305 // The embedded implementor only exists if the current klass is an
306 // iterface. The possible values of the implementor fall into following
307 // three cases:
308 // NULL: no implementor.
309 // A Klass* that's not itself: one implementor.
310 // Itsef: more than one implementors.
311 // embedded host klass follows here
312 // The embedded host klass only exists in an anonymous class for
313 // dynamic language support (JSR 292 enabled). The host class grants
314 // its access privileges to this class also. The host class is either
315 // named, or a previously loaded anonymous class. A non-anonymous class
316 // or an anonymous class loaded through normal classloading does not
317 // have this embedded field.
318 //
320 friend class SystemDictionary;
322 public:
323 bool has_nonstatic_fields() const {
324 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
325 }
326 void set_has_nonstatic_fields(bool b) {
327 if (b) {
328 _misc_flags |= _misc_has_nonstatic_fields;
329 } else {
330 _misc_flags &= ~_misc_has_nonstatic_fields;
331 }
332 }
334 // field sizes
335 int nonstatic_field_size() const { return _nonstatic_field_size; }
336 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
338 int static_field_size() const { return _static_field_size; }
339 void set_static_field_size(int size) { _static_field_size = size; }
341 int static_oop_field_count() const { return (int)_static_oop_field_count; }
342 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
344 // Java vtable
345 int vtable_length() const { return _vtable_len; }
346 void set_vtable_length(int len) { _vtable_len = len; }
348 // Java itable
349 int itable_length() const { return _itable_len; }
350 void set_itable_length(int len) { _itable_len = len; }
352 // array klasses
353 Klass* array_klasses() const { return _array_klasses; }
354 void set_array_klasses(Klass* k) { _array_klasses = k; }
356 // methods
357 Array<Method*>* methods() const { return _methods; }
358 void set_methods(Array<Method*>* a) { _methods = a; }
359 Method* method_with_idnum(int idnum);
361 // method ordering
362 Array<int>* method_ordering() const { return _method_ordering; }
363 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
364 void copy_method_ordering(intArray* m, TRAPS);
366 // interfaces
367 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
368 void set_local_interfaces(Array<Klass*>* a) {
369 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
370 _local_interfaces = a; }
372 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
373 void set_transitive_interfaces(Array<Klass*>* a) {
374 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
375 _transitive_interfaces = a;
376 }
378 private:
379 friend class fieldDescriptor;
380 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
382 public:
383 int field_offset (int index) const { return field(index)->offset(); }
384 int field_access_flags(int index) const { return field(index)->access_flags(); }
385 Symbol* field_name (int index) const { return field(index)->name(constants()); }
386 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
388 // Number of Java declared fields
389 int java_fields_count() const { return (int)_java_fields_count; }
391 Array<u2>* fields() const { return _fields; }
392 void set_fields(Array<u2>* f, u2 java_fields_count) {
393 guarantee(_fields == NULL || f == NULL, "Just checking");
394 _fields = f;
395 _java_fields_count = java_fields_count;
396 }
398 // inner classes
399 Array<u2>* inner_classes() const { return _inner_classes; }
400 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
402 enum InnerClassAttributeOffset {
403 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
404 inner_class_inner_class_info_offset = 0,
405 inner_class_outer_class_info_offset = 1,
406 inner_class_inner_name_offset = 2,
407 inner_class_access_flags_offset = 3,
408 inner_class_next_offset = 4
409 };
411 enum EnclosingMethodAttributeOffset {
412 enclosing_method_class_index_offset = 0,
413 enclosing_method_method_index_offset = 1,
414 enclosing_method_attribute_size = 2
415 };
417 // method override check
418 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
420 // package
421 bool is_same_class_package(Klass* class2);
422 bool is_same_class_package(oop classloader2, Symbol* classname2);
423 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
425 // find an enclosing class (defined where original code was, in jvm.cpp!)
426 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
427 instanceKlassHandle self(THREAD, this);
428 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
429 }
430 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
431 bool* inner_is_member, TRAPS);
433 // tell if two classes have the same enclosing class (at package level)
434 bool is_same_package_member(Klass* class2, TRAPS) {
435 instanceKlassHandle self(THREAD, this);
436 return is_same_package_member_impl(self, class2, THREAD);
437 }
438 static bool is_same_package_member_impl(instanceKlassHandle self,
439 Klass* class2, TRAPS);
441 // initialization state
442 bool is_loaded() const { return _init_state >= loaded; }
443 bool is_linked() const { return _init_state >= linked; }
444 bool is_initialized() const { return _init_state == fully_initialized; }
445 bool is_not_initialized() const { return _init_state < being_initialized; }
446 bool is_being_initialized() const { return _init_state == being_initialized; }
447 bool is_in_error_state() const { return _init_state == initialization_error; }
448 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
449 ClassState init_state() { return (ClassState)_init_state; }
450 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
452 // defineClass specified verification
453 bool should_verify_class() const {
454 return (_misc_flags & _misc_should_verify_class) != 0;
455 }
456 void set_should_verify_class(bool value) {
457 if (value) {
458 _misc_flags |= _misc_should_verify_class;
459 } else {
460 _misc_flags &= ~_misc_should_verify_class;
461 }
462 }
464 // marking
465 bool is_marked_dependent() const { return _is_marked_dependent; }
466 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
468 // initialization (virtuals from Klass)
469 bool should_be_initialized() const; // means that initialize should be called
470 void initialize(TRAPS);
471 void link_class(TRAPS);
472 bool link_class_or_fail(TRAPS); // returns false on failure
473 void unlink_class();
474 void rewrite_class(TRAPS);
475 void link_methods(TRAPS);
476 Method* class_initializer();
478 // set the class to initialized if no static initializer is present
479 void eager_initialize(Thread *thread);
481 // reference type
482 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
483 void set_reference_type(ReferenceType t) {
484 assert(t == (u1)t, "overflow");
485 _reference_type = (u1)t;
486 }
488 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
490 // find local field, returns true if found
491 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
492 // find field in direct superinterfaces, returns the interface in which the field is defined
493 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
494 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
495 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
496 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
497 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
499 // find a non-static or static field given its offset within the class.
500 bool contains_field_offset(int offset) {
501 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
502 }
504 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
505 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
507 // find a local method (returns NULL if not found)
508 Method* find_method(Symbol* name, Symbol* signature) const;
509 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
511 // lookup operation (returns NULL if not found)
512 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
514 // lookup a method in all the interfaces that this class implements
515 // (returns NULL if not found)
516 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
518 // Find method indices by name. If a method with the specified name is
519 // found the index to the first method is returned, and 'end' is filled in
520 // with the index of first non-name-matching method. If no method is found
521 // -1 is returned.
522 int find_method_by_name(Symbol* name, int* end);
523 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
525 // constant pool
526 ConstantPool* constants() const { return _constants; }
527 void set_constants(ConstantPool* c) { _constants = c; }
529 // protection domain
530 oop protection_domain() { return _protection_domain; }
531 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
533 // host class
534 Klass* host_klass() const {
535 Klass** hk = (Klass**)adr_host_klass();
536 if (hk == NULL) {
537 return NULL;
538 } else {
539 return *hk;
540 }
541 }
542 void set_host_klass(Klass* host) {
543 assert(is_anonymous(), "not anonymous");
544 Klass** addr = (Klass**)adr_host_klass();
545 assert(addr != NULL, "no reversed space");
546 if (addr != NULL) {
547 *addr = host;
548 }
549 }
550 bool is_anonymous() const {
551 return (_misc_flags & _misc_is_anonymous) != 0;
552 }
553 void set_is_anonymous(bool value) {
554 if (value) {
555 _misc_flags |= _misc_is_anonymous;
556 } else {
557 _misc_flags &= ~_misc_is_anonymous;
558 }
559 }
561 // Oop that keeps the metadata for this class from being unloaded
562 // in places where the metadata is stored in other places, like nmethods
563 oop klass_holder() const {
564 return is_anonymous() ? java_mirror() : class_loader();
565 }
567 bool is_contended() const {
568 return (_misc_flags & _misc_is_contended) != 0;
569 }
570 void set_is_contended(bool value) {
571 if (value) {
572 _misc_flags |= _misc_is_contended;
573 } else {
574 _misc_flags &= ~_misc_is_contended;
575 }
576 }
578 // signers
579 objArrayOop signers() const { return _signers; }
580 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
582 // source file name
583 Symbol* source_file_name() const { return _source_file_name; }
584 void set_source_file_name(Symbol* n);
586 // minor and major version numbers of class file
587 u2 minor_version() const { return _minor_version; }
588 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
589 u2 major_version() const { return _major_version; }
590 void set_major_version(u2 major_version) { _major_version = major_version; }
592 // source debug extension
593 char* source_debug_extension() const { return _source_debug_extension; }
594 void set_source_debug_extension(char* array, int length);
596 // symbol unloading support (refcount already added)
597 Symbol* array_name() { return _array_name; }
598 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
600 // nonstatic oop-map blocks
601 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
602 return oop_map_count * OopMapBlock::size_in_words();
603 }
604 unsigned int nonstatic_oop_map_count() const {
605 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
606 }
607 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
608 void set_nonstatic_oop_map_size(int words) {
609 _nonstatic_oop_map_size = words;
610 }
612 // RedefineClasses() support for previous versions:
613 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
614 int emcp_method_count);
615 // If the _previous_versions array is non-NULL, then this klass
616 // has been redefined at least once even if we aren't currently
617 // tracking a previous version.
618 bool has_been_redefined() const { return _previous_versions != NULL; }
619 bool has_previous_version() const;
620 void init_previous_versions() {
621 _previous_versions = NULL;
622 }
623 GrowableArray<PreviousVersionNode *>* previous_versions() const {
624 return _previous_versions;
625 }
627 static void purge_previous_versions(InstanceKlass* ik);
629 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
630 void set_cached_class_file(unsigned char *class_file_bytes,
631 jint class_file_len) { _cached_class_file_len = class_file_len;
632 _cached_class_file_bytes = class_file_bytes; }
633 jint get_cached_class_file_len() { return _cached_class_file_len; }
634 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
636 // JVMTI: Support for caching of field indices, types, and offsets
637 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
638 _jvmti_cached_class_field_map = descriptor;
639 }
640 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
641 return _jvmti_cached_class_field_map;
642 }
644 bool has_default_methods() const {
645 return (_misc_flags & _misc_has_default_methods) != 0;
646 }
647 void set_has_default_methods(bool b) {
648 if (b) {
649 _misc_flags |= _misc_has_default_methods;
650 } else {
651 _misc_flags &= ~_misc_has_default_methods;
652 }
653 }
655 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
656 inline u2 next_method_idnum();
657 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
659 // generics support
660 Symbol* generic_signature() const { return _generic_signature; }
661 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
663 u2 enclosing_method_data(int offset);
664 u2 enclosing_method_class_index() {
665 return enclosing_method_data(enclosing_method_class_index_offset);
666 }
667 u2 enclosing_method_method_index() {
668 return enclosing_method_data(enclosing_method_method_index_offset);
669 }
670 void set_enclosing_method_indices(u2 class_index,
671 u2 method_index);
673 // jmethodID support
674 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
675 methodHandle method_h);
676 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
677 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
678 jmethodID* to_dealloc_id_p,
679 jmethodID** to_dealloc_jmeths_p);
680 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
681 size_t *length_p, jmethodID* id_p);
682 jmethodID jmethod_id_or_null(Method* method);
684 // cached itable index support
685 void set_cached_itable_index(size_t idnum, int index);
686 int cached_itable_index(size_t idnum);
688 // annotations support
689 Annotations* annotations() const { return _annotations; }
690 void set_annotations(Annotations* anno) { _annotations = anno; }
692 AnnotationArray* class_annotations() const {
693 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
694 }
695 Array<AnnotationArray*>* fields_annotations() const {
696 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
697 }
698 AnnotationArray* class_type_annotations() const {
699 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
700 }
701 Array<AnnotationArray*>* fields_type_annotations() const {
702 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
703 }
704 // allocation
705 instanceOop allocate_instance(TRAPS);
707 // additional member function to return a handle
708 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
710 objArrayOop allocate_objArray(int n, int length, TRAPS);
711 // Helper function
712 static instanceOop register_finalizer(instanceOop i, TRAPS);
714 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
715 // if not, throw either an Error or an Exception.
716 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
718 // initialization
719 void call_class_initializer(TRAPS);
720 void set_initialization_state_and_notify(ClassState state, TRAPS);
722 // OopMapCache support
723 OopMapCache* oop_map_cache() { return _oop_map_cache; }
724 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
725 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
727 // JNI identifier support (for static fields - for jni performance)
728 JNIid* jni_ids() { return _jni_ids; }
729 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
730 JNIid* jni_id_for(int offset);
732 // maintenance of deoptimization dependencies
733 int mark_dependent_nmethods(DepChange& changes);
734 void add_dependent_nmethod(nmethod* nm);
735 void remove_dependent_nmethod(nmethod* nm);
737 // On-stack replacement support
738 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
739 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
740 void add_osr_nmethod(nmethod* n);
741 void remove_osr_nmethod(nmethod* n);
742 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
744 // Breakpoint support (see methods on Method* for details)
745 BreakpointInfo* breakpoints() const { return _breakpoints; };
746 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
748 // support for stub routines
749 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
750 TRACE_DEFINE_OFFSET;
751 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
753 // subclass/subinterface checks
754 bool implements_interface(Klass* k) const;
756 // Access to the implementor of an interface.
757 Klass* implementor() const
758 {
759 Klass** k = adr_implementor();
760 if (k == NULL) {
761 return NULL;
762 } else {
763 return *k;
764 }
765 }
767 void set_implementor(Klass* k) {
768 assert(is_interface(), "not interface");
769 Klass** addr = adr_implementor();
770 assert(addr != NULL, "null addr");
771 if (addr != NULL) {
772 *addr = k;
773 }
774 }
776 int nof_implementors() const {
777 Klass* k = implementor();
778 if (k == NULL) {
779 return 0;
780 } else if (k != this) {
781 return 1;
782 } else {
783 return 2;
784 }
785 }
787 void add_implementor(Klass* k); // k is a new class that implements this interface
788 void init_implementor(); // initialize
790 // link this class into the implementors list of every interface it implements
791 void process_interfaces(Thread *thread);
793 // virtual operations from Klass
794 bool is_leaf_class() const { return _subklass == NULL; }
795 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
796 bool compute_is_subtype_of(Klass* k);
797 bool can_be_primary_super_slow() const;
798 int oop_size(oop obj) const { return size_helper(); }
799 bool oop_is_instance_slow() const { return true; }
801 // Iterators
802 void do_local_static_fields(FieldClosure* cl);
803 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
804 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
806 void methods_do(void f(Method* method));
807 void array_klasses_do(void f(Klass* k));
808 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
809 void with_array_klasses_do(void f(Klass* k));
810 bool super_types_do(SuperTypeClosure* blk);
812 // Casting from Klass*
813 static InstanceKlass* cast(Klass* k) {
814 assert(k->is_klass(), "must be");
815 assert(k->oop_is_instance(), "cast to InstanceKlass");
816 return (InstanceKlass*) k;
817 }
819 InstanceKlass* java_super() const {
820 return (super() == NULL) ? NULL : cast(super());
821 }
823 // Sizing (in words)
824 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
826 static int size(int vtable_length, int itable_length,
827 int nonstatic_oop_map_size,
828 bool is_interface, bool is_anonymous) {
829 return align_object_size(header_size() +
830 align_object_offset(vtable_length) +
831 align_object_offset(itable_length) +
832 ((is_interface || is_anonymous) ?
833 align_object_offset(nonstatic_oop_map_size) :
834 nonstatic_oop_map_size) +
835 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
836 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
837 }
838 int size() const { return size(vtable_length(),
839 itable_length(),
840 nonstatic_oop_map_size(),
841 is_interface(),
842 is_anonymous());
843 }
844 #if INCLUDE_SERVICES
845 virtual void collect_statistics(KlassSizeStats *sz) const;
846 #endif
848 static int vtable_start_offset() { return header_size(); }
849 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
851 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
852 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
853 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
855 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
857 address static_field_addr(int offset);
859 OopMapBlock* start_of_nonstatic_oop_maps() const {
860 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
861 }
863 Klass** end_of_nonstatic_oop_maps() const {
864 return (Klass**)(start_of_nonstatic_oop_maps() +
865 nonstatic_oop_map_count());
866 }
868 Klass** adr_implementor() const {
869 if (is_interface()) {
870 return (Klass**)end_of_nonstatic_oop_maps();
871 } else {
872 return NULL;
873 }
874 };
876 Klass** adr_host_klass() const {
877 if (is_anonymous()) {
878 Klass** adr_impl = adr_implementor();
879 if (adr_impl != NULL) {
880 return adr_impl + 1;
881 } else {
882 return end_of_nonstatic_oop_maps();
883 }
884 } else {
885 return NULL;
886 }
887 }
889 // Allocation profiling support
890 juint alloc_size() const { return _alloc_count * size_helper(); }
891 void set_alloc_size(juint n) {}
893 // Use this to return the size of an instance in heap words:
894 int size_helper() const {
895 return layout_helper_to_size_helper(layout_helper());
896 }
898 // This bit is initialized in classFileParser.cpp.
899 // It is false under any of the following conditions:
900 // - the class is abstract (including any interface)
901 // - the class has a finalizer (if !RegisterFinalizersAtInit)
902 // - the class size is larger than FastAllocateSizeLimit
903 // - the class is java/lang/Class, which cannot be allocated directly
904 bool can_be_fastpath_allocated() const {
905 return !layout_helper_needs_slow_path(layout_helper());
906 }
908 // Java vtable/itable
909 klassVtable* vtable() const; // return new klassVtable wrapper
910 inline Method* method_at_vtable(int index);
911 klassItable* itable() const; // return new klassItable wrapper
912 Method* method_at_itable(Klass* holder, int index, TRAPS);
914 // Garbage collection
915 virtual void oops_do(OopClosure* cl);
917 void oop_follow_contents(oop obj);
918 int oop_adjust_pointers(oop obj);
920 void clean_implementors_list(BoolObjectClosure* is_alive);
921 void clean_method_data(BoolObjectClosure* is_alive);
923 // Explicit metaspace deallocation of fields
924 // For RedefineClasses and class file parsing errors, we need to deallocate
925 // instanceKlasses and the metadata they point to.
926 void deallocate_contents(ClassLoaderData* loader_data);
927 static void deallocate_methods(ClassLoaderData* loader_data,
928 Array<Method*>* methods);
929 void static deallocate_interfaces(ClassLoaderData* loader_data,
930 Klass* super_klass,
931 Array<Klass*>* local_interfaces,
932 Array<Klass*>* transitive_interfaces);
934 // The constant pool is on stack if any of the methods are executing or
935 // referenced by handles.
936 bool on_stack() const { return _constants->on_stack(); }
938 // callbacks for actions during class unloading
939 static void notify_unload_class(InstanceKlass* ik);
940 static void release_C_heap_structures(InstanceKlass* ik);
942 // Parallel Scavenge and Parallel Old
943 PARALLEL_GC_DECLS
945 // Naming
946 const char* signature_name() const;
948 // Iterators
949 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
950 return oop_oop_iterate_v(obj, blk);
951 }
953 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
954 return oop_oop_iterate_v_m(obj, blk, mr);
955 }
957 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
958 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
959 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
960 MemRegion mr);
962 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
963 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
965 #if INCLUDE_ALL_GCS
966 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
967 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
969 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
970 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
971 #endif // INCLUDE_ALL_GCS
973 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
975 private:
976 // initialization state
977 #ifdef ASSERT
978 void set_init_state(ClassState state);
979 #else
980 void set_init_state(ClassState state) { _init_state = (u1)state; }
981 #endif
982 void set_rewritten() { _misc_flags |= _misc_rewritten; }
983 void set_init_thread(Thread *thread) { _init_thread = thread; }
985 // The RedefineClasses() API can cause new method idnums to be needed
986 // which will cause the caches to grow. Safety requires different
987 // cache management logic if the caches can grow instead of just
988 // going from NULL to non-NULL.
989 bool idnum_can_increment() const { return has_been_redefined(); }
990 jmethodID* methods_jmethod_ids_acquire() const
991 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
992 void release_set_methods_jmethod_ids(jmethodID* jmeths)
993 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
995 int* methods_cached_itable_indices_acquire() const
996 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
997 void release_set_methods_cached_itable_indices(int* indices)
998 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
1000 // Lock during initialization
1001 public:
1002 volatile oop init_lock() const {return _init_lock; }
1003 private:
1004 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
1006 // Offsets for memory management
1007 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
1008 oop* adr_signers() const { return (oop*)&this->_signers;}
1009 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
1011 // Static methods that are used to implement member methods where an exposed this pointer
1012 // is needed due to possible GCs
1013 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1014 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1015 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1016 static void eager_initialize_impl (instanceKlassHandle this_oop);
1017 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1018 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1019 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1020 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
1021 /* jni_id_for_impl for jfieldID only */
1022 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1024 // Returns the array class for the n'th dimension
1025 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1027 // Returns the array class with this class as element type
1028 Klass* array_klass_impl(bool or_null, TRAPS);
1030 // Free CHeap allocated fields.
1031 void release_C_heap_structures();
1032 public:
1033 // CDS support - remove and restore oops from metadata. Oops are not shared.
1034 virtual void remove_unshareable_info();
1035 virtual void restore_unshareable_info(TRAPS);
1037 // jvm support
1038 jint compute_modifier_flags(TRAPS) const;
1040 // JSR-292 support
1041 MemberNameTable* member_names() { return _member_names; }
1042 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1043 void add_member_name(Handle member_name);
1045 public:
1046 // JVMTI support
1047 jint jvmti_class_status() const;
1049 public:
1050 // Printing
1051 #ifndef PRODUCT
1052 void print_on(outputStream* st) const;
1053 #endif
1054 void print_value_on(outputStream* st) const;
1056 void oop_print_value_on(oop obj, outputStream* st);
1058 #ifndef PRODUCT
1059 void oop_print_on (oop obj, outputStream* st);
1061 void print_dependent_nmethods(bool verbose = false);
1062 bool is_dependent_nmethod(nmethod* nm);
1063 #endif
1065 const char* internal_name() const;
1067 // Verification
1068 void verify_on(outputStream* st);
1070 void oop_verify_on(oop obj, outputStream* st);
1071 };
1073 inline Method* InstanceKlass::method_at_vtable(int index) {
1074 #ifndef PRODUCT
1075 assert(index >= 0, "valid vtable index");
1076 if (DebugVtables) {
1077 verify_vtable_index(index);
1078 }
1079 #endif
1080 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1081 return ve[index].method();
1082 }
1084 // for adding methods
1085 // UNSET_IDNUM return means no more ids available
1086 inline u2 InstanceKlass::next_method_idnum() {
1087 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1088 return ConstMethod::UNSET_IDNUM; // no more ids available
1089 } else {
1090 return _idnum_allocated_count++;
1091 }
1092 }
1095 /* JNIid class for jfieldIDs only */
1096 class JNIid: public CHeapObj<mtClass> {
1097 friend class VMStructs;
1098 private:
1099 Klass* _holder;
1100 JNIid* _next;
1101 int _offset;
1102 #ifdef ASSERT
1103 bool _is_static_field_id;
1104 #endif
1106 public:
1107 // Accessors
1108 Klass* holder() const { return _holder; }
1109 int offset() const { return _offset; }
1110 JNIid* next() { return _next; }
1111 // Constructor
1112 JNIid(Klass* holder, int offset, JNIid* next);
1113 // Identifier lookup
1114 JNIid* find(int offset);
1116 bool find_local_field(fieldDescriptor* fd) {
1117 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1118 }
1120 static void deallocate(JNIid* id);
1121 // Debugging
1122 #ifdef ASSERT
1123 bool is_static_field_id() const { return _is_static_field_id; }
1124 void set_is_static_field_id() { _is_static_field_id = true; }
1125 #endif
1126 void verify(Klass* holder);
1127 };
1130 // If breakpoints are more numerous than just JVMTI breakpoints,
1131 // consider compressing this data structure.
1132 // It is currently a simple linked list defined in method.hpp.
1134 class BreakpointInfo;
1137 // A collection point for interesting information about the previous
1138 // version(s) of an InstanceKlass. This class uses weak references to
1139 // the information so that the information may be collected as needed
1140 // by the system. If the information is shared, then a regular
1141 // reference must be used because a weak reference would be seen as
1142 // collectible. A GrowableArray of PreviousVersionNodes is attached
1143 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1144 class PreviousVersionNode : public CHeapObj<mtClass> {
1145 private:
1146 // A shared ConstantPool is never collected so we'll always have
1147 // a reference to it so we can update items in the cache. We'll
1148 // have a weak reference to a non-shared ConstantPool until all
1149 // of the methods (EMCP or obsolete) have been collected; the
1150 // non-shared ConstantPool becomes collectible at that point.
1151 ConstantPool* _prev_constant_pool; // regular or weak reference
1152 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1154 // If the previous version of the InstanceKlass doesn't have any
1155 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1156 // EMCP methods have been collected, then _prev_EMCP_methods can
1157 // have a length of zero.
1158 GrowableArray<Method*>* _prev_EMCP_methods;
1160 public:
1161 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1162 GrowableArray<Method*>* prev_EMCP_methods);
1163 ~PreviousVersionNode();
1164 ConstantPool* prev_constant_pool() const {
1165 return _prev_constant_pool;
1166 }
1167 GrowableArray<Method*>* prev_EMCP_methods() const {
1168 return _prev_EMCP_methods;
1169 }
1170 };
1173 // A Handle-ized version of PreviousVersionNode.
1174 class PreviousVersionInfo : public ResourceObj {
1175 private:
1176 constantPoolHandle _prev_constant_pool_handle;
1177 // If the previous version of the InstanceKlass doesn't have any
1178 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1179 // methods cannot be collected while we hold a handle,
1180 // _prev_EMCP_methods should never have a length of zero.
1181 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1183 public:
1184 PreviousVersionInfo(PreviousVersionNode *pv_node);
1185 ~PreviousVersionInfo();
1186 constantPoolHandle prev_constant_pool_handle() const {
1187 return _prev_constant_pool_handle;
1188 }
1189 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1190 return _prev_EMCP_method_handles;
1191 }
1192 };
1195 // Helper object for walking previous versions. This helper cleans up
1196 // the Handles that it allocates when the helper object is destroyed.
1197 // The PreviousVersionInfo object returned by next_previous_version()
1198 // is only valid until a subsequent call to next_previous_version() or
1199 // the helper object is destroyed.
1200 class PreviousVersionWalker : public StackObj {
1201 private:
1202 GrowableArray<PreviousVersionNode *>* _previous_versions;
1203 int _current_index;
1204 // Fields for cleaning up when we are done walking the previous versions:
1205 // A HandleMark for the PreviousVersionInfo handles:
1206 HandleMark _hm;
1208 // It would be nice to have a ResourceMark field in this helper also,
1209 // but the ResourceMark code says to be careful to delete handles held
1210 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1211 // can't guarantee the order in which the fields are destroyed, we
1212 // have to let the creator of the PreviousVersionWalker object do
1213 // the right thing. Also, adding a ResourceMark here causes an
1214 // include loop.
1216 // A pointer to the current info object so we can handle the deletes.
1217 PreviousVersionInfo * _current_p;
1219 public:
1220 PreviousVersionWalker(InstanceKlass *ik);
1221 ~PreviousVersionWalker();
1223 // Return the interesting information for the next previous version
1224 // of the klass. Returns NULL if there are no more previous versions.
1225 PreviousVersionInfo* next_previous_version();
1226 };
1229 //
1230 // nmethodBucket is used to record dependent nmethods for
1231 // deoptimization. nmethod dependencies are actually <klass, method>
1232 // pairs but we really only care about the klass part for purposes of
1233 // finding nmethods which might need to be deoptimized. Instead of
1234 // recording the method, a count of how many times a particular nmethod
1235 // was recorded is kept. This ensures that any recording errors are
1236 // noticed since an nmethod should be removed as many times are it's
1237 // added.
1238 //
1239 class nmethodBucket: public CHeapObj<mtClass> {
1240 friend class VMStructs;
1241 private:
1242 nmethod* _nmethod;
1243 int _count;
1244 nmethodBucket* _next;
1246 public:
1247 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1248 _nmethod = nmethod;
1249 _next = next;
1250 _count = 1;
1251 }
1252 int count() { return _count; }
1253 int increment() { _count += 1; return _count; }
1254 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1255 nmethodBucket* next() { return _next; }
1256 void set_next(nmethodBucket* b) { _next = b; }
1257 nmethod* get_nmethod() { return _nmethod; }
1258 };
1260 // An iterator that's used to access the inner classes indices in the
1261 // InstanceKlass::_inner_classes array.
1262 class InnerClassesIterator : public StackObj {
1263 private:
1264 Array<jushort>* _inner_classes;
1265 int _length;
1266 int _idx;
1267 public:
1269 InnerClassesIterator(instanceKlassHandle k) {
1270 _inner_classes = k->inner_classes();
1271 if (k->inner_classes() != NULL) {
1272 _length = _inner_classes->length();
1273 // The inner class array's length should be the multiple of
1274 // inner_class_next_offset if it only contains the InnerClasses
1275 // attribute data, or it should be
1276 // n*inner_class_next_offset+enclosing_method_attribute_size
1277 // if it also contains the EnclosingMethod data.
1278 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1279 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1280 "just checking");
1281 // Remove the enclosing_method portion if exists.
1282 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1283 _length -= InstanceKlass::enclosing_method_attribute_size;
1284 }
1285 } else {
1286 _length = 0;
1287 }
1288 _idx = 0;
1289 }
1291 int length() const {
1292 return _length;
1293 }
1295 void next() {
1296 _idx += InstanceKlass::inner_class_next_offset;
1297 }
1299 bool done() const {
1300 return (_idx >= _length);
1301 }
1303 u2 inner_class_info_index() const {
1304 return _inner_classes->at(
1305 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1306 }
1308 void set_inner_class_info_index(u2 index) {
1309 _inner_classes->at_put(
1310 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1311 }
1313 u2 outer_class_info_index() const {
1314 return _inner_classes->at(
1315 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1316 }
1318 void set_outer_class_info_index(u2 index) {
1319 _inner_classes->at_put(
1320 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1321 }
1323 u2 inner_name_index() const {
1324 return _inner_classes->at(
1325 _idx + InstanceKlass::inner_class_inner_name_offset);
1326 }
1328 void set_inner_name_index(u2 index) {
1329 _inner_classes->at_put(
1330 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1331 }
1333 u2 inner_access_flags() const {
1334 return _inner_classes->at(
1335 _idx + InstanceKlass::inner_class_access_flags_offset);
1336 }
1337 };
1339 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP