Sat, 07 Nov 2020 10:30:02 +0800
Added tag mips-jdk8u275-b01 for changeset d3b4d62f391f
1 /*
2 * Copyright (c) 1997, 2017, 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 "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceOop.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/atomic.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/bitMap.inline.hpp"
40 #include "utilities/macros.hpp"
41 #if INCLUDE_JFR
42 #include "jfr/support/jfrKlassExtension.hpp"
43 #endif
45 // An InstanceKlass is the VM level representation of a Java class.
46 // It contains all information needed for at class at execution runtime.
48 // InstanceKlass layout:
49 // [C++ vtbl pointer ] Klass
50 // [subtype cache ] Klass
51 // [instance size ] Klass
52 // [java mirror ] Klass
53 // [super ] Klass
54 // [access_flags ] Klass
55 // [name ] Klass
56 // [first subklass ] Klass
57 // [next sibling ] Klass
58 // [array klasses ]
59 // [methods ]
60 // [local interfaces ]
61 // [transitive interfaces ]
62 // [fields ]
63 // [constants ]
64 // [class loader ]
65 // [source file name ]
66 // [inner classes ]
67 // [static field size ]
68 // [nonstatic field size ]
69 // [static oop fields size ]
70 // [nonstatic oop maps size ]
71 // [has finalize method ]
72 // [deoptimization mark bit ]
73 // [initialization state ]
74 // [initializing thread ]
75 // [Java vtable length ]
76 // [oop map cache (stack maps) ]
77 // [EMBEDDED Java vtable ] size in words = vtable_len
78 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
79 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
80 // indicating where oops are located in instances of this klass.
81 // [EMBEDDED implementor of the interface] only exist for interface
82 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
85 // forward declaration for class -- see below for definition
86 class SuperTypeClosure;
87 class JNIid;
88 class jniIdMapBase;
89 class BreakpointInfo;
90 class fieldDescriptor;
91 class DepChange;
92 class nmethodBucket;
93 class JvmtiCachedClassFieldMap;
94 class MemberNameTable;
96 // This is used in iterators below.
97 class FieldClosure: public StackObj {
98 public:
99 virtual void do_field(fieldDescriptor* fd) = 0;
100 };
102 #ifndef PRODUCT
103 // Print fields.
104 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
105 class FieldPrinter: public FieldClosure {
106 oop _obj;
107 outputStream* _st;
108 public:
109 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
110 void do_field(fieldDescriptor* fd);
111 };
112 #endif // !PRODUCT
114 // ValueObjs embedded in klass. Describes where oops are located in instances of
115 // this klass.
116 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
117 public:
118 // Byte offset of the first oop mapped by this block.
119 int offset() const { return _offset; }
120 void set_offset(int offset) { _offset = offset; }
122 // Number of oops in this block.
123 uint count() const { return _count; }
124 void set_count(uint count) { _count = count; }
126 // sizeof(OopMapBlock) in HeapWords.
127 static const int size_in_words() {
128 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
129 LogHeapWordSize;
130 }
132 private:
133 int _offset;
134 uint _count;
135 };
137 struct JvmtiCachedClassFileData;
139 class InstanceKlass: public Klass {
140 friend class VMStructs;
141 friend class ClassFileParser;
142 friend class CompileReplay;
144 protected:
145 // Constructor
146 InstanceKlass(int vtable_len,
147 int itable_len,
148 int static_field_size,
149 int nonstatic_oop_map_size,
150 ReferenceType rt,
151 AccessFlags access_flags,
152 bool is_anonymous);
153 public:
154 static InstanceKlass* allocate_instance_klass(
155 ClassLoaderData* loader_data,
156 int vtable_len,
157 int itable_len,
158 int static_field_size,
159 int nonstatic_oop_map_size,
160 ReferenceType rt,
161 AccessFlags access_flags,
162 Symbol* name,
163 Klass* super_klass,
164 bool is_anonymous,
165 TRAPS);
167 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
169 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
170 // of the class loading & initialization procedure, and the use of the states.
171 enum ClassState {
172 allocated, // allocated (but not yet linked)
173 loaded, // loaded and inserted in class hierarchy (but not linked yet)
174 linked, // successfully linked/verified (but not initialized yet)
175 being_initialized, // currently running class initializer
176 fully_initialized, // initialized (successfull final state)
177 initialization_error // error happened during initialization
178 };
180 static int number_of_instance_classes() { return _total_instanceKlass_count; }
182 private:
183 static volatile int _total_instanceKlass_count;
185 protected:
186 // Annotations for this class
187 Annotations* _annotations;
188 // Array classes holding elements of this class.
189 Klass* _array_klasses;
190 // Constant pool for this class.
191 ConstantPool* _constants;
192 // The InnerClasses attribute and EnclosingMethod attribute. The
193 // _inner_classes is an array of shorts. If the class has InnerClasses
194 // attribute, then the _inner_classes array begins with 4-tuples of shorts
195 // [inner_class_info_index, outer_class_info_index,
196 // inner_name_index, inner_class_access_flags] for the InnerClasses
197 // attribute. If the EnclosingMethod attribute exists, it occupies the
198 // last two shorts [class_index, method_index] of the array. If only
199 // the InnerClasses attribute exists, the _inner_classes array length is
200 // number_of_inner_classes * 4. If the class has both InnerClasses
201 // and EnclosingMethod attributes the _inner_classes array length is
202 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
203 Array<jushort>* _inner_classes;
205 // the source debug extension for this klass, NULL if not specified.
206 // Specified as UTF-8 string without terminating zero byte in the classfile,
207 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
208 char* _source_debug_extension;
209 // Array name derived from this class which needs unreferencing
210 // if this class is unloaded.
211 Symbol* _array_name;
213 // Number of heapOopSize words used by non-static fields in this klass
214 // (including inherited fields but after header_size()).
215 int _nonstatic_field_size;
216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
217 // Constant pool index to the utf8 entry of the Generic signature,
218 // or 0 if none.
219 u2 _generic_signature_index;
220 // Constant pool index to the utf8 entry for the name of source file
221 // containing this klass, 0 if not specified.
222 u2 _source_file_name_index;
223 u2 _static_oop_field_count;// number of static oop fields in this klass
224 u2 _java_fields_count; // The number of declared Java fields
225 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
227 // _is_marked_dependent can be set concurrently, thus cannot be part of the
228 // _misc_flags.
229 bool _is_marked_dependent; // used for marking during flushing and deoptimization
230 bool _is_being_redefined; // used for locking redefinition
231 bool _has_unloaded_dependent;
233 enum {
234 _misc_rewritten = 1 << 0, // methods rewritten.
235 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
236 _misc_should_verify_class = 1 << 2, // allow caching of preverification
237 _misc_is_anonymous = 1 << 3, // has embedded _host_klass field
238 _misc_is_contended = 1 << 4, // marked with contended annotation
239 _misc_has_default_methods = 1 << 5, // class/superclass/implemented interfaces has default methods
240 _misc_declares_default_methods = 1 << 6, // directly declares default methods (any access)
241 _misc_has_been_redefined = 1 << 7 // class has been redefined
242 };
243 u2 _misc_flags;
244 u2 _minor_version; // minor version number of class file
245 u2 _major_version; // major version number of class file
246 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
247 int _vtable_len; // length of Java vtable (in words)
248 int _itable_len; // length of Java itable (in words)
249 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
250 MemberNameTable* _member_names; // Member names
251 JNIid* _jni_ids; // First JNI identifier for static fields in this class
252 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
253 nmethodBucket* _dependencies; // list of dependent nmethods
254 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
255 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
256 // Linked instanceKlasses of previous versions
257 InstanceKlass* _previous_versions;
258 // JVMTI fields can be moved to their own structure - see 6315920
259 // JVMTI: cached class file, before retransformable agent modified it in CFLH
260 JvmtiCachedClassFileData* _cached_class_file;
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 // Default Method Array, concrete methods inherited from interfaces
277 Array<Method*>* _default_methods;
278 // Interface (Klass*s) this class declares locally to implement.
279 Array<Klass*>* _local_interfaces;
280 // Interface (Klass*s) this class implements transitively.
281 Array<Klass*>* _transitive_interfaces;
282 // Int array containing the original order of method in the class file (for JVMTI).
283 Array<int>* _method_ordering;
284 // Int array containing the vtable_indices for default_methods
285 // offset matches _default_methods offset
286 Array<int>* _default_vtable_indices;
288 // Instance and static variable information, starts with 6-tuples of shorts
289 // [access, name index, sig index, initval index, low_offset, high_offset]
290 // for all fields, followed by the generic signature data at the end of
291 // the array. Only fields with generic signature attributes have the generic
292 // signature data set in the array. The fields array looks like following:
293 //
294 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
295 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
296 // ...
297 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
298 // [generic signature index]
299 // [generic signature index]
300 // ...
301 Array<u2>* _fields;
303 // embedded Java vtable follows here
304 // embedded Java itables follows here
305 // embedded static fields follows here
306 // embedded nonstatic oop-map blocks follows here
307 // embedded implementor of this interface follows here
308 // The embedded implementor only exists if the current klass is an
309 // iterface. The possible values of the implementor fall into following
310 // three cases:
311 // NULL: no implementor.
312 // A Klass* that's not itself: one implementor.
313 // Itself: more than one implementors.
314 // embedded host klass follows here
315 // The embedded host klass only exists in an anonymous class for
316 // dynamic language support (JSR 292 enabled). The host class grants
317 // its access privileges to this class also. The host class is either
318 // named, or a previously loaded anonymous class. A non-anonymous class
319 // or an anonymous class loaded through normal classloading does not
320 // have this embedded field.
321 //
323 friend class SystemDictionary;
325 public:
326 bool has_nonstatic_fields() const {
327 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
328 }
329 void set_has_nonstatic_fields(bool b) {
330 if (b) {
331 _misc_flags |= _misc_has_nonstatic_fields;
332 } else {
333 _misc_flags &= ~_misc_has_nonstatic_fields;
334 }
335 }
337 // field sizes
338 int nonstatic_field_size() const { return _nonstatic_field_size; }
339 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
341 int static_field_size() const { return _static_field_size; }
342 void set_static_field_size(int size) { _static_field_size = size; }
344 int static_oop_field_count() const { return (int)_static_oop_field_count; }
345 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
347 // Java vtable
348 int vtable_length() const { return _vtable_len; }
349 void set_vtable_length(int len) { _vtable_len = len; }
351 // Java itable
352 int itable_length() const { return _itable_len; }
353 void set_itable_length(int len) { _itable_len = len; }
355 // array klasses
356 Klass* array_klasses() const { return _array_klasses; }
357 void set_array_klasses(Klass* k) { _array_klasses = k; }
359 // methods
360 Array<Method*>* methods() const { return _methods; }
361 void set_methods(Array<Method*>* a) { _methods = a; }
362 Method* method_with_idnum(int idnum);
363 Method* method_with_orig_idnum(int idnum);
364 Method* method_with_orig_idnum(int idnum, int version);
366 // method ordering
367 Array<int>* method_ordering() const { return _method_ordering; }
368 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
369 void copy_method_ordering(intArray* m, TRAPS);
371 // default_methods
372 Array<Method*>* default_methods() const { return _default_methods; }
373 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
375 // default method vtable_indices
376 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
377 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
378 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
380 // interfaces
381 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
382 void set_local_interfaces(Array<Klass*>* a) {
383 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
384 _local_interfaces = a; }
386 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
387 void set_transitive_interfaces(Array<Klass*>* a) {
388 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
389 _transitive_interfaces = a;
390 }
392 private:
393 friend class fieldDescriptor;
394 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
396 public:
397 int field_offset (int index) const { return field(index)->offset(); }
398 int field_access_flags(int index) const { return field(index)->access_flags(); }
399 Symbol* field_name (int index) const { return field(index)->name(constants()); }
400 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
402 // Number of Java declared fields
403 int java_fields_count() const { return (int)_java_fields_count; }
405 Array<u2>* fields() const { return _fields; }
406 void set_fields(Array<u2>* f, u2 java_fields_count) {
407 guarantee(_fields == NULL || f == NULL, "Just checking");
408 _fields = f;
409 _java_fields_count = java_fields_count;
410 }
412 // inner classes
413 Array<u2>* inner_classes() const { return _inner_classes; }
414 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
416 enum InnerClassAttributeOffset {
417 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
418 inner_class_inner_class_info_offset = 0,
419 inner_class_outer_class_info_offset = 1,
420 inner_class_inner_name_offset = 2,
421 inner_class_access_flags_offset = 3,
422 inner_class_next_offset = 4
423 };
425 enum EnclosingMethodAttributeOffset {
426 enclosing_method_class_index_offset = 0,
427 enclosing_method_method_index_offset = 1,
428 enclosing_method_attribute_size = 2
429 };
431 // method override check
432 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
434 // package
435 bool is_same_class_package(Klass* class2);
436 bool is_same_class_package(oop classloader2, Symbol* classname2);
437 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
439 // find an enclosing class (defined where original code was, in jvm.cpp!)
440 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
441 instanceKlassHandle self(THREAD, this);
442 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
443 }
444 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
445 bool* inner_is_member, TRAPS);
447 // tell if two classes have the same enclosing class (at package level)
448 bool is_same_package_member(Klass* class2, TRAPS) {
449 instanceKlassHandle self(THREAD, this);
450 return is_same_package_member_impl(self, class2, THREAD);
451 }
452 static bool is_same_package_member_impl(instanceKlassHandle self,
453 Klass* class2, TRAPS);
455 // initialization state
456 bool is_loaded() const { return _init_state >= loaded; }
457 bool is_linked() const { return _init_state >= linked; }
458 bool is_initialized() const { return _init_state == fully_initialized; }
459 bool is_not_initialized() const { return _init_state < being_initialized; }
460 bool is_being_initialized() const { return _init_state == being_initialized; }
461 bool is_in_error_state() const { return _init_state == initialization_error; }
462 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
463 ClassState init_state() { return (ClassState)_init_state; }
464 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
466 // defineClass specified verification
467 bool should_verify_class() const {
468 return (_misc_flags & _misc_should_verify_class) != 0;
469 }
470 void set_should_verify_class(bool value) {
471 if (value) {
472 _misc_flags |= _misc_should_verify_class;
473 } else {
474 _misc_flags &= ~_misc_should_verify_class;
475 }
476 }
478 // marking
479 bool is_marked_dependent() const { return _is_marked_dependent; }
480 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
482 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
483 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
485 // initialization (virtuals from Klass)
486 bool should_be_initialized() const; // means that initialize should be called
487 void initialize(TRAPS);
488 void link_class(TRAPS);
489 bool link_class_or_fail(TRAPS); // returns false on failure
490 void unlink_class();
491 void rewrite_class(TRAPS);
492 void link_methods(TRAPS);
493 Method* class_initializer();
495 // set the class to initialized if no static initializer is present
496 void eager_initialize(Thread *thread);
498 // reference type
499 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
500 void set_reference_type(ReferenceType t) {
501 assert(t == (u1)t, "overflow");
502 _reference_type = (u1)t;
503 }
505 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
507 // find local field, returns true if found
508 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
509 // find field in direct superinterfaces, returns the interface in which the field is defined
510 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
511 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
512 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
513 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
514 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
516 // find a non-static or static field given its offset within the class.
517 bool contains_field_offset(int offset) {
518 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
519 }
521 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
522 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
524 // find a local method (returns NULL if not found)
525 Method* find_method(Symbol* name, Symbol* signature) const;
526 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
528 // find a local method, but skip static methods
529 Method* find_instance_method(Symbol* name, Symbol* signature);
530 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
532 // find a local method (returns NULL if not found)
533 Method* find_local_method(Symbol* name, Symbol* signature,
534 OverpassLookupMode overpass_mode,
535 StaticLookupMode static_mode,
536 PrivateLookupMode private_mode) const;
538 // find a local method from given methods array (returns NULL if not found)
539 static Method* find_local_method(Array<Method*>* methods,
540 Symbol* name, Symbol* signature,
541 OverpassLookupMode overpass_mode,
542 StaticLookupMode static_mode,
543 PrivateLookupMode private_mode);
545 // true if method matches signature and conforms to skipping_X conditions.
546 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
548 // find a local method index in methods or default_methods (returns -1 if not found)
549 static int find_method_index(Array<Method*>* methods,
550 Symbol* name, Symbol* signature,
551 OverpassLookupMode overpass_mode,
552 StaticLookupMode static_mode,
553 PrivateLookupMode private_mode);
556 // lookup operation (returns NULL if not found)
557 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
559 // lookup a method in all the interfaces that this class implements
560 // (returns NULL if not found)
561 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
563 // lookup a method in local defaults then in all interfaces
564 // (returns NULL if not found)
565 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
567 // Find method indices by name. If a method with the specified name is
568 // found the index to the first method is returned, and 'end' is filled in
569 // with the index of first non-name-matching method. If no method is found
570 // -1 is returned.
571 int find_method_by_name(Symbol* name, int* end);
572 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
574 // constant pool
575 ConstantPool* constants() const { return _constants; }
576 void set_constants(ConstantPool* c) { _constants = c; }
578 // protection domain
579 oop protection_domain() const;
581 // signers
582 objArrayOop signers() const;
584 // host class
585 Klass* host_klass() const {
586 Klass** hk = (Klass**)adr_host_klass();
587 if (hk == NULL) {
588 assert(!is_anonymous(), "Anonymous classes have host klasses");
589 return NULL;
590 } else {
591 assert(*hk != NULL, "host klass should always be set if the address is not null");
592 assert(is_anonymous(), "Only anonymous classes have host klasses");
593 return *hk;
594 }
595 }
596 void set_host_klass(Klass* host) {
597 assert(is_anonymous(), "not anonymous");
598 Klass** addr = (Klass**)adr_host_klass();
599 assert(addr != NULL, "no reversed space");
600 if (addr != NULL) {
601 *addr = host;
602 }
603 }
604 bool has_host_klass() const {
605 return adr_host_klass() != NULL;
606 }
607 bool is_anonymous() const {
608 return (_misc_flags & _misc_is_anonymous) != 0;
609 }
610 void set_is_anonymous(bool value) {
611 if (value) {
612 _misc_flags |= _misc_is_anonymous;
613 } else {
614 _misc_flags &= ~_misc_is_anonymous;
615 }
616 }
618 // Oop that keeps the metadata for this class from being unloaded
619 // in places where the metadata is stored in other places, like nmethods
620 oop klass_holder() const {
621 return is_anonymous() ? java_mirror() : class_loader();
622 }
624 bool is_contended() const {
625 return (_misc_flags & _misc_is_contended) != 0;
626 }
627 void set_is_contended(bool value) {
628 if (value) {
629 _misc_flags |= _misc_is_contended;
630 } else {
631 _misc_flags &= ~_misc_is_contended;
632 }
633 }
635 // source file name
636 Symbol* source_file_name() const {
637 return (_source_file_name_index == 0) ?
638 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
639 }
640 u2 source_file_name_index() const {
641 return _source_file_name_index;
642 }
643 void set_source_file_name_index(u2 sourcefile_index) {
644 _source_file_name_index = sourcefile_index;
645 }
647 // minor and major version numbers of class file
648 u2 minor_version() const { return _minor_version; }
649 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
650 u2 major_version() const { return _major_version; }
651 void set_major_version(u2 major_version) { _major_version = major_version; }
653 // source debug extension
654 char* source_debug_extension() const { return _source_debug_extension; }
655 void set_source_debug_extension(char* array, int length);
657 // symbol unloading support (refcount already added)
658 Symbol* array_name() { return _array_name; }
659 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
661 // nonstatic oop-map blocks
662 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
663 return oop_map_count * OopMapBlock::size_in_words();
664 }
665 unsigned int nonstatic_oop_map_count() const {
666 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
667 }
668 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
669 void set_nonstatic_oop_map_size(int words) {
670 _nonstatic_oop_map_size = words;
671 }
673 // Redefinition locking. Class can only be redefined by one thread at a time.
674 bool is_being_redefined() const { return _is_being_redefined; }
675 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
677 // RedefineClasses() support for previous versions:
678 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
680 InstanceKlass* previous_versions() const { return _previous_versions; }
682 bool has_been_redefined() const {
683 return (_misc_flags & _misc_has_been_redefined) != 0;
684 }
685 void set_has_been_redefined() {
686 _misc_flags |= _misc_has_been_redefined;
687 }
689 void init_previous_versions() {
690 _previous_versions = NULL;
691 }
694 InstanceKlass* get_klass_version(int version) {
695 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
696 if (ik->constants()->version() == version) {
697 return ik;
698 }
699 }
700 return NULL;
701 }
703 static void purge_previous_versions(InstanceKlass* ik);
705 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
706 void set_cached_class_file(JvmtiCachedClassFileData *data) {
707 _cached_class_file = data;
708 }
709 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
710 jint get_cached_class_file_len();
711 unsigned char * get_cached_class_file_bytes();
713 // JVMTI: Support for caching of field indices, types, and offsets
714 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
715 _jvmti_cached_class_field_map = descriptor;
716 }
717 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
718 return _jvmti_cached_class_field_map;
719 }
721 bool has_default_methods() const {
722 return (_misc_flags & _misc_has_default_methods) != 0;
723 }
724 void set_has_default_methods(bool b) {
725 if (b) {
726 _misc_flags |= _misc_has_default_methods;
727 } else {
728 _misc_flags &= ~_misc_has_default_methods;
729 }
730 }
732 bool declares_default_methods() const {
733 return (_misc_flags & _misc_declares_default_methods) != 0;
734 }
735 void set_declares_default_methods(bool b) {
736 if (b) {
737 _misc_flags |= _misc_declares_default_methods;
738 } else {
739 _misc_flags &= ~_misc_declares_default_methods;
740 }
741 }
743 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
744 inline u2 next_method_idnum();
745 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
747 // generics support
748 Symbol* generic_signature() const {
749 return (_generic_signature_index == 0) ?
750 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
751 }
752 u2 generic_signature_index() const {
753 return _generic_signature_index;
754 }
755 void set_generic_signature_index(u2 sig_index) {
756 _generic_signature_index = sig_index;
757 }
759 u2 enclosing_method_data(int offset);
760 u2 enclosing_method_class_index() {
761 return enclosing_method_data(enclosing_method_class_index_offset);
762 }
763 u2 enclosing_method_method_index() {
764 return enclosing_method_data(enclosing_method_method_index_offset);
765 }
766 void set_enclosing_method_indices(u2 class_index,
767 u2 method_index);
769 // jmethodID support
770 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
771 methodHandle method_h);
772 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
773 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
774 jmethodID* to_dealloc_id_p,
775 jmethodID** to_dealloc_jmeths_p);
776 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
777 size_t *length_p, jmethodID* id_p);
778 jmethodID jmethod_id_or_null(Method* method);
780 // annotations support
781 Annotations* annotations() const { return _annotations; }
782 void set_annotations(Annotations* anno) { _annotations = anno; }
784 AnnotationArray* class_annotations() const {
785 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
786 }
787 Array<AnnotationArray*>* fields_annotations() const {
788 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
789 }
790 AnnotationArray* class_type_annotations() const {
791 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
792 }
793 Array<AnnotationArray*>* fields_type_annotations() const {
794 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
795 }
796 // allocation
797 instanceOop allocate_instance(TRAPS);
799 // additional member function to return a handle
800 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
802 objArrayOop allocate_objArray(int n, int length, TRAPS);
803 // Helper function
804 static instanceOop register_finalizer(instanceOop i, TRAPS);
806 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
807 // if not, throw either an Error or an Exception.
808 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
810 // initialization
811 void call_class_initializer(TRAPS);
812 void set_initialization_state_and_notify(ClassState state, TRAPS);
814 // OopMapCache support
815 OopMapCache* oop_map_cache() { return _oop_map_cache; }
816 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
817 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
819 // JNI identifier support (for static fields - for jni performance)
820 JNIid* jni_ids() { return _jni_ids; }
821 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
822 JNIid* jni_id_for(int offset);
824 // maintenance of deoptimization dependencies
825 int mark_dependent_nmethods(DepChange& changes);
826 void add_dependent_nmethod(nmethod* nm);
827 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
829 // On-stack replacement support
830 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
831 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
832 void add_osr_nmethod(nmethod* n);
833 void remove_osr_nmethod(nmethod* n);
834 int mark_osr_nmethods(const Method* m);
835 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
837 // Breakpoint support (see methods on Method* for details)
838 BreakpointInfo* breakpoints() const { return _breakpoints; };
839 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
841 // support for stub routines
842 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
843 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
844 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
846 // subclass/subinterface checks
847 bool implements_interface(Klass* k) const;
848 bool is_same_or_direct_interface(Klass* k) const;
850 #ifdef ASSERT
851 // check whether this class or one of its superclasses was redefined
852 bool has_redefined_this_or_super() const;
853 #endif
855 // Access to the implementor of an interface.
856 Klass* implementor() const
857 {
858 Klass** k = adr_implementor();
859 if (k == NULL) {
860 return NULL;
861 } else {
862 return *k;
863 }
864 }
866 void set_implementor(Klass* k) {
867 assert(is_interface(), "not interface");
868 Klass** addr = adr_implementor();
869 assert(addr != NULL, "null addr");
870 if (addr != NULL) {
871 *addr = k;
872 }
873 }
875 int nof_implementors() const {
876 Klass* k = implementor();
877 if (k == NULL) {
878 return 0;
879 } else if (k != this) {
880 return 1;
881 } else {
882 return 2;
883 }
884 }
886 void add_implementor(Klass* k); // k is a new class that implements this interface
887 void init_implementor(); // initialize
889 // link this class into the implementors list of every interface it implements
890 void process_interfaces(Thread *thread);
892 // virtual operations from Klass
893 bool is_leaf_class() const { return _subklass == NULL; }
894 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
895 bool compute_is_subtype_of(Klass* k);
896 bool can_be_primary_super_slow() const;
897 int oop_size(oop obj) const { return size_helper(); }
898 bool oop_is_instance_slow() const { return true; }
900 // Iterators
901 void do_local_static_fields(FieldClosure* cl);
902 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
903 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
905 void methods_do(void f(Method* method));
906 void array_klasses_do(void f(Klass* k));
907 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
908 bool super_types_do(SuperTypeClosure* blk);
910 // Casting from Klass*
911 static InstanceKlass* cast(Klass* k) {
912 assert(k == NULL || k->is_klass(), "must be");
913 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
914 return (InstanceKlass*) k;
915 }
917 InstanceKlass* java_super() const {
918 return (super() == NULL) ? NULL : cast(super());
919 }
921 // Sizing (in words)
922 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
924 static int size(int vtable_length, int itable_length,
925 int nonstatic_oop_map_size,
926 bool is_interface, bool is_anonymous) {
927 return align_object_size(header_size() +
928 align_object_offset(vtable_length) +
929 align_object_offset(itable_length) +
930 ((is_interface || is_anonymous) ?
931 align_object_offset(nonstatic_oop_map_size) :
932 nonstatic_oop_map_size) +
933 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
934 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
935 }
936 int size() const { return size(vtable_length(),
937 itable_length(),
938 nonstatic_oop_map_size(),
939 is_interface(),
940 is_anonymous());
941 }
942 #if INCLUDE_SERVICES
943 virtual void collect_statistics(KlassSizeStats *sz) const;
944 #endif
946 static int vtable_start_offset() { return header_size(); }
947 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
949 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
950 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
951 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
953 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
955 address static_field_addr(int offset);
957 OopMapBlock* start_of_nonstatic_oop_maps() const {
958 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
959 }
961 Klass** end_of_nonstatic_oop_maps() const {
962 return (Klass**)(start_of_nonstatic_oop_maps() +
963 nonstatic_oop_map_count());
964 }
966 Klass** adr_implementor() const {
967 if (is_interface()) {
968 return (Klass**)end_of_nonstatic_oop_maps();
969 } else {
970 return NULL;
971 }
972 };
974 Klass** adr_host_klass() const {
975 if (is_anonymous()) {
976 Klass** adr_impl = adr_implementor();
977 if (adr_impl != NULL) {
978 return adr_impl + 1;
979 } else {
980 return end_of_nonstatic_oop_maps();
981 }
982 } else {
983 return NULL;
984 }
985 }
987 // Use this to return the size of an instance in heap words:
988 int size_helper() const {
989 return layout_helper_to_size_helper(layout_helper());
990 }
992 // This bit is initialized in classFileParser.cpp.
993 // It is false under any of the following conditions:
994 // - the class is abstract (including any interface)
995 // - the class has a finalizer (if !RegisterFinalizersAtInit)
996 // - the class size is larger than FastAllocateSizeLimit
997 // - the class is java/lang/Class, which cannot be allocated directly
998 bool can_be_fastpath_allocated() const {
999 return !layout_helper_needs_slow_path(layout_helper());
1000 }
1002 // Java vtable/itable
1003 klassVtable* vtable() const; // return new klassVtable wrapper
1004 inline Method* method_at_vtable(int index);
1005 klassItable* itable() const; // return new klassItable wrapper
1006 Method* method_at_itable(Klass* holder, int index, TRAPS);
1008 #if INCLUDE_JVMTI
1009 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1010 #endif // INCLUDE_JVMTI
1012 // Garbage collection
1013 void oop_follow_contents(oop obj);
1014 int oop_adjust_pointers(oop obj);
1016 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1017 void clean_implementors_list(BoolObjectClosure* is_alive);
1018 void clean_method_data(BoolObjectClosure* is_alive);
1019 void clean_dependent_nmethods();
1021 // Explicit metaspace deallocation of fields
1022 // For RedefineClasses and class file parsing errors, we need to deallocate
1023 // instanceKlasses and the metadata they point to.
1024 void deallocate_contents(ClassLoaderData* loader_data);
1025 static void deallocate_methods(ClassLoaderData* loader_data,
1026 Array<Method*>* methods);
1027 void static deallocate_interfaces(ClassLoaderData* loader_data,
1028 Klass* super_klass,
1029 Array<Klass*>* local_interfaces,
1030 Array<Klass*>* transitive_interfaces);
1032 // The constant pool is on stack if any of the methods are executing or
1033 // referenced by handles.
1034 bool on_stack() const { return _constants->on_stack(); }
1036 // callbacks for actions during class unloading
1037 static void notify_unload_class(InstanceKlass* ik);
1038 static void release_C_heap_structures(InstanceKlass* ik);
1040 // Parallel Scavenge and Parallel Old
1041 PARALLEL_GC_DECLS
1043 // Naming
1044 const char* signature_name() const;
1046 // Iterators
1047 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
1048 return oop_oop_iterate_v(obj, blk);
1049 }
1051 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
1052 return oop_oop_iterate_v_m(obj, blk, mr);
1053 }
1055 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
1056 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
1057 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
1058 MemRegion mr);
1060 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
1061 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
1063 #if INCLUDE_ALL_GCS
1064 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
1065 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
1067 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1068 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
1069 #endif // INCLUDE_ALL_GCS
1071 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1073 public:
1074 void set_in_error_state() {
1075 assert(DumpSharedSpaces, "only call this when dumping archive");
1076 _init_state = initialization_error;
1077 }
1078 bool check_sharing_error_state();
1080 private:
1081 // initialization state
1082 #ifdef ASSERT
1083 void set_init_state(ClassState state);
1084 #else
1085 void set_init_state(ClassState state) { _init_state = (u1)state; }
1086 #endif
1087 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1088 void set_init_thread(Thread *thread) { _init_thread = thread; }
1090 // The RedefineClasses() API can cause new method idnums to be needed
1091 // which will cause the caches to grow. Safety requires different
1092 // cache management logic if the caches can grow instead of just
1093 // going from NULL to non-NULL.
1094 bool idnum_can_increment() const { return has_been_redefined(); }
1095 jmethodID* methods_jmethod_ids_acquire() const
1096 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1097 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1098 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1100 // Lock during initialization
1101 public:
1102 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1103 // Must be one per class and it has to be a VM internal object so java code
1104 // cannot lock it (like the mirror).
1105 // It has to be an object not a Mutex because it's held through java calls.
1106 oop init_lock() const;
1107 private:
1108 void fence_and_clear_init_lock();
1110 // Static methods that are used to implement member methods where an exposed this pointer
1111 // is needed due to possible GCs
1112 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1113 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
1114 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
1115 static void initialize_super_interfaces (instanceKlassHandle this_oop, TRAPS);
1116 static void eager_initialize_impl (instanceKlassHandle this_oop);
1117 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
1118 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
1119 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
1120 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1121 /* jni_id_for_impl for jfieldID only */
1122 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
1124 // Returns the array class for the n'th dimension
1125 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1127 // Returns the array class with this class as element type
1128 Klass* array_klass_impl(bool or_null, TRAPS);
1130 // find a local method (returns NULL if not found)
1131 Method* find_method_impl(Symbol* name, Symbol* signature,
1132 OverpassLookupMode overpass_mode,
1133 StaticLookupMode static_mode,
1134 PrivateLookupMode private_mode) const;
1135 static Method* find_method_impl(Array<Method*>* methods,
1136 Symbol* name, Symbol* signature,
1137 OverpassLookupMode overpass_mode,
1138 StaticLookupMode static_mode,
1139 PrivateLookupMode private_mode);
1141 // Free CHeap allocated fields.
1142 void release_C_heap_structures();
1144 // RedefineClasses support
1145 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1146 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1147 public:
1148 // CDS support - remove and restore oops from metadata. Oops are not shared.
1149 virtual void remove_unshareable_info();
1150 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1152 // jvm support
1153 jint compute_modifier_flags(TRAPS) const;
1155 // JSR-292 support
1156 MemberNameTable* member_names() { return _member_names; }
1157 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1158 oop add_member_name(Handle member_name, bool intern);
1160 public:
1161 // JVMTI support
1162 jint jvmti_class_status() const;
1164 public:
1165 // Printing
1166 #ifndef PRODUCT
1167 void print_on(outputStream* st) const;
1168 #endif
1169 void print_value_on(outputStream* st) const;
1171 void oop_print_value_on(oop obj, outputStream* st);
1173 #ifndef PRODUCT
1174 void oop_print_on (oop obj, outputStream* st);
1176 void print_dependent_nmethods(bool verbose = false);
1177 bool is_dependent_nmethod(nmethod* nm);
1178 #endif
1180 const char* internal_name() const;
1182 // Verification
1183 void verify_on(outputStream* st);
1185 void oop_verify_on(oop obj, outputStream* st);
1186 };
1188 inline Method* InstanceKlass::method_at_vtable(int index) {
1189 #ifndef PRODUCT
1190 assert(index >= 0, "valid vtable index");
1191 if (DebugVtables) {
1192 verify_vtable_index(index);
1193 }
1194 #endif
1195 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1196 return ve[index].method();
1197 }
1199 // for adding methods
1200 // UNSET_IDNUM return means no more ids available
1201 inline u2 InstanceKlass::next_method_idnum() {
1202 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1203 return ConstMethod::UNSET_IDNUM; // no more ids available
1204 } else {
1205 return _idnum_allocated_count++;
1206 }
1207 }
1210 /* JNIid class for jfieldIDs only */
1211 class JNIid: public CHeapObj<mtClass> {
1212 friend class VMStructs;
1213 private:
1214 Klass* _holder;
1215 JNIid* _next;
1216 int _offset;
1217 #ifdef ASSERT
1218 bool _is_static_field_id;
1219 #endif
1221 public:
1222 // Accessors
1223 Klass* holder() const { return _holder; }
1224 int offset() const { return _offset; }
1225 JNIid* next() { return _next; }
1226 // Constructor
1227 JNIid(Klass* holder, int offset, JNIid* next);
1228 // Identifier lookup
1229 JNIid* find(int offset);
1231 bool find_local_field(fieldDescriptor* fd) {
1232 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1233 }
1235 static void deallocate(JNIid* id);
1236 // Debugging
1237 #ifdef ASSERT
1238 bool is_static_field_id() const { return _is_static_field_id; }
1239 void set_is_static_field_id() { _is_static_field_id = true; }
1240 #endif
1241 void verify(Klass* holder);
1242 };
1245 //
1246 // nmethodBucket is used to record dependent nmethods for
1247 // deoptimization. nmethod dependencies are actually <klass, method>
1248 // pairs but we really only care about the klass part for purposes of
1249 // finding nmethods which might need to be deoptimized. Instead of
1250 // recording the method, a count of how many times a particular nmethod
1251 // was recorded is kept. This ensures that any recording errors are
1252 // noticed since an nmethod should be removed as many times are it's
1253 // added.
1254 //
1255 class nmethodBucket: public CHeapObj<mtClass> {
1256 friend class VMStructs;
1257 private:
1258 nmethod* _nmethod;
1259 int _count;
1260 nmethodBucket* _next;
1262 public:
1263 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1264 _nmethod = nmethod;
1265 _next = next;
1266 _count = 1;
1267 }
1268 int count() { return _count; }
1269 int increment() { _count += 1; return _count; }
1270 int decrement();
1271 nmethodBucket* next() { return _next; }
1272 void set_next(nmethodBucket* b) { _next = b; }
1273 nmethod* get_nmethod() { return _nmethod; }
1274 };
1276 // An iterator that's used to access the inner classes indices in the
1277 // InstanceKlass::_inner_classes array.
1278 class InnerClassesIterator : public StackObj {
1279 private:
1280 Array<jushort>* _inner_classes;
1281 int _length;
1282 int _idx;
1283 public:
1285 InnerClassesIterator(instanceKlassHandle k) {
1286 _inner_classes = k->inner_classes();
1287 if (k->inner_classes() != NULL) {
1288 _length = _inner_classes->length();
1289 // The inner class array's length should be the multiple of
1290 // inner_class_next_offset if it only contains the InnerClasses
1291 // attribute data, or it should be
1292 // n*inner_class_next_offset+enclosing_method_attribute_size
1293 // if it also contains the EnclosingMethod data.
1294 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1295 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1296 "just checking");
1297 // Remove the enclosing_method portion if exists.
1298 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1299 _length -= InstanceKlass::enclosing_method_attribute_size;
1300 }
1301 } else {
1302 _length = 0;
1303 }
1304 _idx = 0;
1305 }
1307 int length() const {
1308 return _length;
1309 }
1311 void next() {
1312 _idx += InstanceKlass::inner_class_next_offset;
1313 }
1315 bool done() const {
1316 return (_idx >= _length);
1317 }
1319 u2 inner_class_info_index() const {
1320 return _inner_classes->at(
1321 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1322 }
1324 void set_inner_class_info_index(u2 index) {
1325 _inner_classes->at_put(
1326 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1327 }
1329 u2 outer_class_info_index() const {
1330 return _inner_classes->at(
1331 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1332 }
1334 void set_outer_class_info_index(u2 index) {
1335 _inner_classes->at_put(
1336 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1337 }
1339 u2 inner_name_index() const {
1340 return _inner_classes->at(
1341 _idx + InstanceKlass::inner_class_inner_name_offset);
1342 }
1344 void set_inner_name_index(u2 index) {
1345 _inner_classes->at_put(
1346 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1347 }
1349 u2 inner_access_flags() const {
1350 return _inner_classes->at(
1351 _idx + InstanceKlass::inner_class_access_flags_offset);
1352 }
1353 };
1355 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP