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.
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23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/packageEntry.hpp"
32 #include "gc/shared/specialized_oop_closures.hpp"
33 #include "memory/referenceType.hpp"
34 #include "oops/annotations.hpp"
35 #include "oops/constMethod.hpp"
36 #include "oops/fieldInfo.hpp"
37 #include "oops/instanceOop.hpp"
38 #include "oops/klassVtable.hpp"
39 #include "runtime/handles.hpp"
40 #include "runtime/os.hpp"
41 #include "trace/traceMacros.hpp"
42 #include "utilities/accessFlags.hpp"
43 #include "utilities/macros.hpp"
44
45 // An InstanceKlass is the VM level representation of a Java class.
46 // It contains all information needed for at class at execution runtime.
47
48 // InstanceKlass embedded field layout (after declared fields):
49 // [EMBEDDED Java vtable ] size in words = vtable_len
50 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
51 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
52 // indicating where oops are located in instances of this klass.
53 // [EMBEDDED implementor of the interface] only exist for interface
54 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
55 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
56
57
58 // forward declaration for class -- see below for definition
59 #if INCLUDE_JVMTI
60 class BreakpointInfo;
61 #endif
62 class ClassFileParser;
63 class KlassDepChange;
64 class DependencyContext;
65 class fieldDescriptor;
66 class jniIdMapBase;
67 class JNIid;
68 class JvmtiCachedClassFieldMap;
69 class SuperTypeClosure;
70
71 // This is used in iterators below.
72 class FieldClosure: public StackObj {
73 public:
74 virtual void do_field(fieldDescriptor* fd) = 0;
75 };
76
77 #ifndef PRODUCT
78 // Print fields.
79 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
80 class FieldPrinter: public FieldClosure {
81 oop _obj;
82 outputStream* _st;
83 public:
84 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
85 void do_field(fieldDescriptor* fd);
86 };
87 #endif // !PRODUCT
88
89 // ValueObjs embedded in klass. Describes where oops are located in instances of
90 // this klass.
91 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
92 public:
93 // Byte offset of the first oop mapped by this block.
94 int offset() const { return _offset; }
95 void set_offset(int offset) { _offset = offset; }
96
97 // Number of oops in this block.
98 uint count() const { return _count; }
99 void set_count(uint count) { _count = count; }
100
101 // sizeof(OopMapBlock) in words.
102 static const int size_in_words() {
103 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >>
104 LogBytesPerWord;
105 }
106
107 private:
108 int _offset;
109 uint _count;
110 };
111
112 struct JvmtiCachedClassFileData;
113
114 class InstanceKlass: public Klass {
115 friend class VMStructs;
116 friend class JVMCIVMStructs;
117 friend class ClassFileParser;
118 friend class CompileReplay;
119
120 protected:
121 InstanceKlass(const ClassFileParser& parser, unsigned kind);
122
123 public:
124 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
125
126 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
127 // of the class loading & initialization procedure, and the use of the states.
128 enum ClassState {
129 allocated, // allocated (but not yet linked)
130 loaded, // loaded and inserted in class hierarchy (but not linked yet)
131 linked, // successfully linked/verified (but not initialized yet)
132 being_initialized, // currently running class initializer
133 fully_initialized, // initialized (successfull final state)
134 initialization_error // error happened during initialization
135 };
136
137 static int number_of_instance_classes() { return _total_instanceKlass_count; }
138
139 private:
140 static volatile int _total_instanceKlass_count;
141 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
142
143 protected:
144 // Annotations for this class
145 Annotations* _annotations;
146 // Package this class is defined in
147 PackageEntry* _package_entry;
148 // Array classes holding elements of this class.
149 Klass* volatile _array_klasses;
150 // Constant pool for this class.
151 ConstantPool* _constants;
152 // The InnerClasses attribute and EnclosingMethod attribute. The
153 // _inner_classes is an array of shorts. If the class has InnerClasses
154 // attribute, then the _inner_classes array begins with 4-tuples of shorts
155 // [inner_class_info_index, outer_class_info_index,
156 // inner_name_index, inner_class_access_flags] for the InnerClasses
157 // attribute. If the EnclosingMethod attribute exists, it occupies the
158 // last two shorts [class_index, method_index] of the array. If only
159 // the InnerClasses attribute exists, the _inner_classes array length is
160 // number_of_inner_classes * 4. If the class has both InnerClasses
161 // and EnclosingMethod attributes the _inner_classes array length is
162 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
163 Array<jushort>* _inner_classes;
164
165 // the source debug extension for this klass, NULL if not specified.
166 // Specified as UTF-8 string without terminating zero byte in the classfile,
167 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
168 const char* _source_debug_extension;
169 // Array name derived from this class which needs unreferencing
170 // if this class is unloaded.
171 Symbol* _array_name;
172
173 // Number of heapOopSize words used by non-static fields in this klass
174 // (including inherited fields but after header_size()).
175 int _nonstatic_field_size;
176 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
177 // Constant pool index to the utf8 entry of the Generic signature,
178 // or 0 if none.
179 u2 _generic_signature_index;
180 // Constant pool index to the utf8 entry for the name of source file
181 // containing this klass, 0 if not specified.
182 u2 _source_file_name_index;
183 u2 _static_oop_field_count;// number of static oop fields in this klass
184 u2 _java_fields_count; // The number of declared Java fields
185 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
186
187 int _itable_len; // length of Java itable (in words)
188 // _is_marked_dependent can be set concurrently, thus cannot be part of the
189 // _misc_flags.
190 bool _is_marked_dependent; // used for marking during flushing and deoptimization
191 bool _is_being_redefined; // used for locking redefinition
192
193 // The low two bits of _misc_flags contains the kind field.
194 // This can be used to quickly discriminate among the four kinds of
195 // InstanceKlass.
196
197 static const unsigned _misc_kind_field_size = 2;
198 static const unsigned _misc_kind_field_pos = 0;
199 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
200
201 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
202 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
203 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
204 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
205
206 // Start after _misc_kind field.
207 enum {
208 _misc_rewritten = 1 << 2, // methods rewritten.
209 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
210 _misc_should_verify_class = 1 << 4, // allow caching of preverification
211 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
212 _misc_is_contended = 1 << 6, // marked with contended annotation
213 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
214 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
215 _misc_has_been_redefined = 1 << 9, // class has been redefined
216 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
217 // code source was found to be matching the value recorded by AOT.
218 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
219 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
220 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
221 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
222 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
223 };
224 u2 loader_type_bits() {
225 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
226 }
227 u2 _misc_flags;
228 u2 _minor_version; // minor version number of class file
229 u2 _major_version; // major version number of class file
230 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
231 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
232 JNIid* _jni_ids; // First JNI identifier for static fields in this class
233 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
234 intptr_t _dep_context; // packed DependencyContext structure
235 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
236 #if INCLUDE_JVMTI
237 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
238 // Linked instanceKlasses of previous versions
239 InstanceKlass* _previous_versions;
240 // JVMTI fields can be moved to their own structure - see 6315920
241 // JVMTI: cached class file, before retransformable agent modified it in CFLH
242 JvmtiCachedClassFileData* _cached_class_file;
243 #endif
244
245 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
246
247 // Class states are defined as ClassState (see above).
248 // Place the _init_state here to utilize the unused 2-byte after
249 // _idnum_allocated_count.
250 u1 _init_state; // state of class
251 u1 _reference_type; // reference type
252
253 #if INCLUDE_JVMTI
254 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
255 #endif
256
257 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
258
259 // Method array.
260 Array<Method*>* _methods;
261 // Default Method Array, concrete methods inherited from interfaces
262 Array<Method*>* _default_methods;
263 // Interface (Klass*s) this class declares locally to implement.
264 Array<Klass*>* _local_interfaces;
265 // Interface (Klass*s) this class implements transitively.
266 Array<Klass*>* _transitive_interfaces;
267 // Int array containing the original order of method in the class file (for JVMTI).
268 Array<int>* _method_ordering;
269 // Int array containing the vtable_indices for default_methods
270 // offset matches _default_methods offset
271 Array<int>* _default_vtable_indices;
272
273 // Instance and static variable information, starts with 6-tuples of shorts
274 // [access, name index, sig index, initval index, low_offset, high_offset]
275 // for all fields, followed by the generic signature data at the end of
276 // the array. Only fields with generic signature attributes have the generic
277 // signature data set in the array. The fields array looks like following:
278 //
279 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
280 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
281 // ...
282 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
283 // [generic signature index]
284 // [generic signature index]
285 // ...
286 Array<u2>* _fields;
287
288 // embedded Java vtable follows here
289 // embedded Java itables follows here
290 // embedded static fields follows here
291 // embedded nonstatic oop-map blocks follows here
292 // embedded implementor of this interface follows here
293 // The embedded implementor only exists if the current klass is an
294 // iterface. The possible values of the implementor fall into following
295 // three cases:
296 // NULL: no implementor.
297 // A Klass* that's not itself: one implementor.
298 // Itself: more than one implementors.
299 // embedded host klass follows here
300 // The embedded host klass only exists in an anonymous class for
301 // dynamic language support (JSR 292 enabled). The host class grants
302 // its access privileges to this class also. The host class is either
303 // named, or a previously loaded anonymous class. A non-anonymous class
304 // or an anonymous class loaded through normal classloading does not
305 // have this embedded field.
306 //
307
308 friend class SystemDictionary;
309
310 public:
311 u2 loader_type() {
312 return _misc_flags & loader_type_bits();
313 }
314
315 bool is_shared_boot_class() const {
316 return (_misc_flags & _misc_is_shared_boot_class) != 0;
317 }
318 bool is_shared_platform_class() const {
319 return (_misc_flags & _misc_is_shared_platform_class) != 0;
320 }
321 bool is_shared_app_class() const {
322 return (_misc_flags & _misc_is_shared_app_class) != 0;
323 }
324
325 void set_class_loader_type(s2 loader_type) {
326 assert(( _misc_flags & loader_type_bits()) == 0,
327 "Should only be called once for each class.");
328 switch (loader_type) {
329 case ClassLoader::BOOT_LOADER:
330 _misc_flags |= _misc_is_shared_boot_class;
331 break;
332 case ClassLoader::PLATFORM_LOADER:
333 _misc_flags |= _misc_is_shared_platform_class;
334 break;
335 case ClassLoader::APP_LOADER:
336 _misc_flags |= _misc_is_shared_app_class;
337 break;
338 default:
339 ShouldNotReachHere();
340 break;
341 }
342 }
343
344 bool has_nonstatic_fields() const {
345 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
346 }
347 void set_has_nonstatic_fields(bool b) {
348 if (b) {
349 _misc_flags |= _misc_has_nonstatic_fields;
350 } else {
351 _misc_flags &= ~_misc_has_nonstatic_fields;
352 }
353 }
354
355 // field sizes
356 int nonstatic_field_size() const { return _nonstatic_field_size; }
357 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
358
359 int static_field_size() const { return _static_field_size; }
360 void set_static_field_size(int size) { _static_field_size = size; }
361
362 int static_oop_field_count() const { return (int)_static_oop_field_count; }
363 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
364
365 // Java itable
366 int itable_length() const { return _itable_len; }
367 void set_itable_length(int len) { _itable_len = len; }
368
369 // array klasses
370 Klass* array_klasses() const { return _array_klasses; }
371 inline Klass* array_klasses_acquire() const; // load with acquire semantics
372 void set_array_klasses(Klass* k) { _array_klasses = k; }
373 inline void release_set_array_klasses(Klass* k); // store with release semantics
374
375 // methods
376 Array<Method*>* methods() const { return _methods; }
377 void set_methods(Array<Method*>* a) { _methods = a; }
378 Method* method_with_idnum(int idnum);
379 Method* method_with_orig_idnum(int idnum);
380 Method* method_with_orig_idnum(int idnum, int version);
381
382 // method ordering
383 Array<int>* method_ordering() const { return _method_ordering; }
384 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
385 void copy_method_ordering(const intArray* m, TRAPS);
386
387 // default_methods
388 Array<Method*>* default_methods() const { return _default_methods; }
389 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
390
391 // default method vtable_indices
392 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
393 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
394 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
395
396 // interfaces
397 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
398 void set_local_interfaces(Array<Klass*>* a) {
399 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
400 _local_interfaces = a; }
401
402 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
403 void set_transitive_interfaces(Array<Klass*>* a) {
404 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
405 _transitive_interfaces = a;
406 }
407
408 private:
409 friend class fieldDescriptor;
410 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
411
412 public:
413 int field_offset (int index) const { return field(index)->offset(); }
414 int field_access_flags(int index) const { return field(index)->access_flags(); }
415 Symbol* field_name (int index) const { return field(index)->name(constants()); }
416 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
417
418 // Number of Java declared fields
419 int java_fields_count() const { return (int)_java_fields_count; }
420
421 Array<u2>* fields() const { return _fields; }
422 void set_fields(Array<u2>* f, u2 java_fields_count) {
423 guarantee(_fields == NULL || f == NULL, "Just checking");
424 _fields = f;
425 _java_fields_count = java_fields_count;
426 }
427
428 // inner classes
429 Array<u2>* inner_classes() const { return _inner_classes; }
430 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
431
432 enum InnerClassAttributeOffset {
433 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
434 inner_class_inner_class_info_offset = 0,
435 inner_class_outer_class_info_offset = 1,
436 inner_class_inner_name_offset = 2,
437 inner_class_access_flags_offset = 3,
438 inner_class_next_offset = 4
439 };
440
441 enum EnclosingMethodAttributeOffset {
442 enclosing_method_class_index_offset = 0,
443 enclosing_method_method_index_offset = 1,
444 enclosing_method_attribute_size = 2
445 };
446
447 // method override check
448 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
449
450 // package
451 PackageEntry* package() const { return _package_entry; }
452 ModuleEntry* module() const;
453 bool in_unnamed_package() const { return (_package_entry == NULL); }
454 void set_package(PackageEntry* p) { _package_entry = p; }
455 void set_package(ClassLoaderData* loader_data, TRAPS);
456 bool is_same_class_package(const Klass* class2) const;
457 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
458 static bool is_same_class_package(oop class_loader1,
459 const Symbol* class_name1,
460 oop class_loader2,
461 const Symbol* class_name2);
462
463 // find an enclosing class
464 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
465
466 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
467 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
468
469 private:
470 // Check prohibited package ("java/" only loadable by boot or platform loaders)
471 static void check_prohibited_package(Symbol* class_name,
472 Handle class_loader,
473 TRAPS);
474 public:
475 // tell if two classes have the same enclosing class (at package level)
476 bool is_same_package_member(const Klass* class2, TRAPS) const;
477
478 // initialization state
479 bool is_loaded() const { return _init_state >= loaded; }
480 bool is_linked() const { return _init_state >= linked; }
481 bool is_initialized() const { return _init_state == fully_initialized; }
482 bool is_not_initialized() const { return _init_state < being_initialized; }
483 bool is_being_initialized() const { return _init_state == being_initialized; }
484 bool is_in_error_state() const { return _init_state == initialization_error; }
485 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
486 ClassState init_state() { return (ClassState)_init_state; }
487 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
488
489 // defineClass specified verification
490 bool should_verify_class() const {
491 return (_misc_flags & _misc_should_verify_class) != 0;
492 }
493 void set_should_verify_class(bool value) {
494 if (value) {
495 _misc_flags |= _misc_should_verify_class;
496 } else {
497 _misc_flags &= ~_misc_should_verify_class;
498 }
499 }
500
501 // marking
502 bool is_marked_dependent() const { return _is_marked_dependent; }
503 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
504
505 // initialization (virtuals from Klass)
506 bool should_be_initialized() const; // means that initialize should be called
507 void initialize(TRAPS);
508 void link_class(TRAPS);
509 bool link_class_or_fail(TRAPS); // returns false on failure
510 void unlink_class();
511 void rewrite_class(TRAPS);
512 void link_methods(TRAPS);
513 Method* class_initializer() const;
514
515 // set the class to initialized if no static initializer is present
516 void eager_initialize(Thread *thread);
517
518 // reference type
519 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
520 void set_reference_type(ReferenceType t) {
521 assert(t == (u1)t, "overflow");
522 _reference_type = (u1)t;
523 }
524
525 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
526
527 // find local field, returns true if found
528 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
529 // find field in direct superinterfaces, returns the interface in which the field is defined
530 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
531 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
532 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
533 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
534 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
535
536 // find a non-static or static field given its offset within the class.
537 bool contains_field_offset(int offset) {
538 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
539 }
540
541 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
542 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
543
544 // find a local method (returns NULL if not found)
545 Method* find_method(const Symbol* name, const Symbol* signature) const;
546 static Method* find_method(const Array<Method*>* methods,
547 const Symbol* name,
548 const Symbol* signature);
549
550 // find a local method, but skip static methods
551 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
552 static Method* find_instance_method(const Array<Method*>* methods,
553 const Symbol* name,
554 const Symbol* signature);
555
556 // find a local method (returns NULL if not found)
557 Method* find_local_method(const Symbol* name,
558 const Symbol* signature,
559 OverpassLookupMode overpass_mode,
560 StaticLookupMode static_mode,
561 PrivateLookupMode private_mode) const;
562
563 // find a local method from given methods array (returns NULL if not found)
564 static Method* find_local_method(const Array<Method*>* methods,
565 const Symbol* name,
566 const Symbol* signature,
567 OverpassLookupMode overpass_mode,
568 StaticLookupMode static_mode,
569 PrivateLookupMode private_mode);
570
571 // find a local method index in methods or default_methods (returns -1 if not found)
572 static int find_method_index(const Array<Method*>* methods,
573 const Symbol* name,
574 const Symbol* signature,
575 OverpassLookupMode overpass_mode,
576 StaticLookupMode static_mode,
577 PrivateLookupMode private_mode);
578
579 // lookup operation (returns NULL if not found)
580 Method* uncached_lookup_method(const Symbol* name,
581 const Symbol* signature,
582 OverpassLookupMode overpass_mode) const;
583
584 // lookup a method in all the interfaces that this class implements
585 // (returns NULL if not found)
586 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
587
588 // lookup a method in local defaults then in all interfaces
589 // (returns NULL if not found)
590 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
591
592 // Find method indices by name. If a method with the specified name is
593 // found the index to the first method is returned, and 'end' is filled in
594 // with the index of first non-name-matching method. If no method is found
595 // -1 is returned.
596 int find_method_by_name(const Symbol* name, int* end) const;
597 static int find_method_by_name(const Array<Method*>* methods,
598 const Symbol* name, int* end);
599
600 // constant pool
601 ConstantPool* constants() const { return _constants; }
602 void set_constants(ConstantPool* c) { _constants = c; }
603
604 // protection domain
605 oop protection_domain() const;
606
607 // signers
608 objArrayOop signers() const;
609
610 // host class
611 InstanceKlass* host_klass() const {
612 InstanceKlass** hk = adr_host_klass();
613 if (hk == NULL) {
614 return NULL;
615 } else {
616 assert(*hk != NULL, "host klass should always be set if the address is not null");
617 return *hk;
618 }
619 }
620 void set_host_klass(const InstanceKlass* host) {
621 assert(is_anonymous(), "not anonymous");
622 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
623 assert(addr != NULL, "no reversed space");
624 if (addr != NULL) {
625 *addr = host;
626 }
627 }
628 bool is_anonymous() const {
629 return (_misc_flags & _misc_is_anonymous) != 0;
630 }
631 void set_is_anonymous(bool value) {
632 if (value) {
633 _misc_flags |= _misc_is_anonymous;
634 } else {
635 _misc_flags &= ~_misc_is_anonymous;
636 }
637 }
638
639 // Oop that keeps the metadata for this class from being unloaded
640 // in places where the metadata is stored in other places, like nmethods
641 oop klass_holder() const {
642 return is_anonymous() ? java_mirror() : class_loader();
643 }
644
645 bool is_contended() const {
646 return (_misc_flags & _misc_is_contended) != 0;
647 }
648 void set_is_contended(bool value) {
649 if (value) {
650 _misc_flags |= _misc_is_contended;
651 } else {
652 _misc_flags &= ~_misc_is_contended;
653 }
654 }
655
656 // source file name
657 Symbol* source_file_name() const {
658 return (_source_file_name_index == 0) ?
659 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
660 }
661 u2 source_file_name_index() const {
662 return _source_file_name_index;
663 }
664 void set_source_file_name_index(u2 sourcefile_index) {
665 _source_file_name_index = sourcefile_index;
666 }
667
668 // minor and major version numbers of class file
669 u2 minor_version() const { return _minor_version; }
670 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
671 u2 major_version() const { return _major_version; }
672 void set_major_version(u2 major_version) { _major_version = major_version; }
673
674 // source debug extension
675 const char* source_debug_extension() const { return _source_debug_extension; }
676 void set_source_debug_extension(const char* array, int length);
677
678 // symbol unloading support (refcount already added)
679 Symbol* array_name() { return _array_name; }
680 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
681
682 // nonstatic oop-map blocks
683 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
684 return oop_map_count * OopMapBlock::size_in_words();
685 }
686 unsigned int nonstatic_oop_map_count() const {
687 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
688 }
689 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
690 void set_nonstatic_oop_map_size(int words) {
691 _nonstatic_oop_map_size = words;
692 }
693
694 #if INCLUDE_JVMTI
695 // Redefinition locking. Class can only be redefined by one thread at a time.
696 bool is_being_redefined() const { return _is_being_redefined; }
697 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
698
699 // RedefineClasses() support for previous versions:
700 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
701 void purge_previous_version_list();
702
703 InstanceKlass* previous_versions() const { return _previous_versions; }
704 #else
705 InstanceKlass* previous_versions() const { return NULL; }
706 #endif
707
708 InstanceKlass* get_klass_version(int version) {
709 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
710 if (ik->constants()->version() == version) {
711 return ik;
712 }
713 }
714 return NULL;
715 }
716
717 bool has_been_redefined() const {
718 return (_misc_flags & _misc_has_been_redefined) != 0;
719 }
720 void set_has_been_redefined() {
721 _misc_flags |= _misc_has_been_redefined;
722 }
723
724 bool has_passed_fingerprint_check() const {
725 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
726 }
727 void set_has_passed_fingerprint_check(bool b) {
728 if (b) {
729 _misc_flags |= _misc_has_passed_fingerprint_check;
730 } else {
731 _misc_flags &= ~_misc_has_passed_fingerprint_check;
732 }
733 }
734 bool supers_have_passed_fingerprint_checks();
735
736 static bool should_store_fingerprint();
737 bool has_stored_fingerprint() const;
738 uint64_t get_stored_fingerprint() const;
739 void store_fingerprint(uint64_t fingerprint);
740
741 bool is_scratch_class() const {
742 return (_misc_flags & _misc_is_scratch_class) != 0;
743 }
744
745 void set_is_scratch_class() {
746 _misc_flags |= _misc_is_scratch_class;
747 }
748
749 bool has_resolved_methods() const {
750 return (_misc_flags & _misc_has_resolved_methods) != 0;
751 }
752
753 void set_has_resolved_methods() {
754 _misc_flags |= _misc_has_resolved_methods;
755 }
756 private:
757
758 void set_kind(unsigned kind) {
759 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
760 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
761 unsigned flags = _misc_flags & ~fmask;
762 _misc_flags = (flags | (kind << _misc_kind_field_pos));
763 }
764
765 bool is_kind(unsigned desired) const {
766 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
767 return kind == desired;
768 }
769
770 public:
771
772 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
773 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
774 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
775 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
776 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
777
778 #if INCLUDE_JVMTI
779
780 void init_previous_versions() {
781 _previous_versions = NULL;
782 }
783
784 private:
785 static bool _has_previous_versions;
786 public:
787 static void purge_previous_versions(InstanceKlass* ik) {
788 if (ik->has_been_redefined()) {
789 ik->purge_previous_version_list();
790 }
791 }
792
793 static bool has_previous_versions_and_reset();
794
795 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
796 void set_cached_class_file(JvmtiCachedClassFileData *data) {
797 _cached_class_file = data;
798 }
799 JvmtiCachedClassFileData * get_cached_class_file();
800 jint get_cached_class_file_len();
801 unsigned char * get_cached_class_file_bytes();
802
803 // JVMTI: Support for caching of field indices, types, and offsets
804 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
805 _jvmti_cached_class_field_map = descriptor;
806 }
807 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
808 return _jvmti_cached_class_field_map;
809 }
810
811 #if INCLUDE_CDS
812 void set_archived_class_data(JvmtiCachedClassFileData* data) {
813 _cached_class_file = data;
814 }
815
816 JvmtiCachedClassFileData * get_archived_class_data();
817 #endif // INCLUDE_CDS
818 #else // INCLUDE_JVMTI
819
820 static void purge_previous_versions(InstanceKlass* ik) { return; };
821 static bool has_previous_versions_and_reset() { return false; }
822
823 void set_cached_class_file(JvmtiCachedClassFileData *data) {
824 assert(data == NULL, "unexpected call with JVMTI disabled");
825 }
826 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
827
828 #endif // INCLUDE_JVMTI
829
830 bool has_nonstatic_concrete_methods() const {
831 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
832 }
833 void set_has_nonstatic_concrete_methods(bool b) {
834 if (b) {
835 _misc_flags |= _misc_has_nonstatic_concrete_methods;
836 } else {
837 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
838 }
839 }
840
841 bool declares_nonstatic_concrete_methods() const {
842 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
843 }
844 void set_declares_nonstatic_concrete_methods(bool b) {
845 if (b) {
846 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
847 } else {
848 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
849 }
850 }
851
852 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
853 inline u2 next_method_idnum();
854 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
855
856 // generics support
857 Symbol* generic_signature() const {
858 return (_generic_signature_index == 0) ?
859 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
860 }
861 u2 generic_signature_index() const {
862 return _generic_signature_index;
863 }
864 void set_generic_signature_index(u2 sig_index) {
865 _generic_signature_index = sig_index;
866 }
867
868 u2 enclosing_method_data(int offset) const;
869 u2 enclosing_method_class_index() const {
870 return enclosing_method_data(enclosing_method_class_index_offset);
871 }
872 u2 enclosing_method_method_index() {
873 return enclosing_method_data(enclosing_method_method_index_offset);
874 }
875 void set_enclosing_method_indices(u2 class_index,
876 u2 method_index);
877
878 // jmethodID support
879 jmethodID get_jmethod_id(const methodHandle& method_h);
880 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
881 jmethodID new_id, jmethodID* new_jmeths,
882 jmethodID* to_dealloc_id_p,
883 jmethodID** to_dealloc_jmeths_p);
884 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
885 size_t *length_p, jmethodID* id_p);
886 void ensure_space_for_methodids(int start_offset = 0);
887 jmethodID jmethod_id_or_null(Method* method);
888
889 // annotations support
890 Annotations* annotations() const { return _annotations; }
891 void set_annotations(Annotations* anno) { _annotations = anno; }
892
893 AnnotationArray* class_annotations() const {
894 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
895 }
896 Array<AnnotationArray*>* fields_annotations() const {
897 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
898 }
899 AnnotationArray* class_type_annotations() const {
900 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
901 }
902 Array<AnnotationArray*>* fields_type_annotations() const {
903 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
904 }
905 // allocation
906 instanceOop allocate_instance(TRAPS);
907
908 // additional member function to return a handle
909 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
910
911 objArrayOop allocate_objArray(int n, int length, TRAPS);
912 // Helper function
913 static instanceOop register_finalizer(instanceOop i, TRAPS);
914
915 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
916 // if not, throw either an Error or an Exception.
917 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
918
919 // initialization
920 void call_class_initializer(TRAPS);
921 void set_initialization_state_and_notify(ClassState state, TRAPS);
922
923 // OopMapCache support
924 OopMapCache* oop_map_cache() { return _oop_map_cache; }
925 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
926 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
927
928 // JNI identifier support (for static fields - for jni performance)
929 JNIid* jni_ids() { return _jni_ids; }
930 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
931 JNIid* jni_id_for(int offset);
932
933 // maintenance of deoptimization dependencies
934 inline DependencyContext dependencies();
935 int mark_dependent_nmethods(KlassDepChange& changes);
936 void add_dependent_nmethod(nmethod* nm);
937 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
938
939 // On-stack replacement support
940 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
941 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
942 void add_osr_nmethod(nmethod* n);
943 bool remove_osr_nmethod(nmethod* n);
944 int mark_osr_nmethods(const Method* m);
945 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
946
947 #if INCLUDE_JVMTI
948 // Breakpoint support (see methods on Method* for details)
949 BreakpointInfo* breakpoints() const { return _breakpoints; };
950 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
951 #endif
952
953 // support for stub routines
954 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
955 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
956 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
957
958 // subclass/subinterface checks
959 bool implements_interface(Klass* k) const;
960 bool is_same_or_direct_interface(Klass* k) const;
961
962 #ifdef ASSERT
963 // check whether this class or one of its superclasses was redefined
964 bool has_redefined_this_or_super() const;
965 #endif
966
967 // Access to the implementor of an interface.
968 Klass* implementor() const
969 {
970 Klass** k = adr_implementor();
971 if (k == NULL) {
972 return NULL;
973 } else {
974 return *k;
975 }
976 }
977
978 void set_implementor(Klass* k) {
979 assert(is_interface(), "not interface");
980 Klass** addr = adr_implementor();
981 assert(addr != NULL, "null addr");
982 if (addr != NULL) {
983 *addr = k;
984 }
985 }
986
987 int nof_implementors() const {
988 Klass* k = implementor();
989 if (k == NULL) {
990 return 0;
991 } else if (k != this) {
992 return 1;
993 } else {
994 return 2;
995 }
996 }
997
998 void add_implementor(Klass* k); // k is a new class that implements this interface
999 void init_implementor(); // initialize
1000
1001 // link this class into the implementors list of every interface it implements
1002 void process_interfaces(Thread *thread);
1003
1004 // virtual operations from Klass
1005 bool is_leaf_class() const { return _subklass == NULL; }
1006 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1007 bool compute_is_subtype_of(Klass* k);
1008 bool can_be_primary_super_slow() const;
1009 int oop_size(oop obj) const { return size_helper(); }
1010 // slow because it's a virtual call and used for verifying the layout_helper.
1011 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1012 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1013
1014 // Iterators
1015 void do_local_static_fields(FieldClosure* cl);
1016 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1017 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1018
1019 void methods_do(void f(Method* method));
1020 void array_klasses_do(void f(Klass* k));
1021 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1022 bool super_types_do(SuperTypeClosure* blk);
1023
1024 static InstanceKlass* cast(Klass* k) {
1025 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1026 }
1027
1028 static const InstanceKlass* cast(const Klass* k) {
1029 assert(k != NULL, "k should not be null");
1030 assert(k->is_instance_klass(), "cast to InstanceKlass");
1031 return static_cast<const InstanceKlass*>(k);
1032 }
1033
1034 InstanceKlass* java_super() const {
1035 return (super() == NULL) ? NULL : cast(super());
1036 }
1037
1038 // Sizing (in words)
1039 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1040
1041 static int size(int vtable_length, int itable_length,
1042 int nonstatic_oop_map_size,
1043 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) {
1044 return align_metadata_size(header_size() +
1045 vtable_length +
1046 itable_length +
1047 nonstatic_oop_map_size +
1048 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1049 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1050 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1051 }
1052 int size() const { return size(vtable_length(),
1053 itable_length(),
1054 nonstatic_oop_map_size(),
1055 is_interface(),
1056 is_anonymous(),
1057 has_stored_fingerprint());
1058 }
1059 #if INCLUDE_SERVICES
1060 virtual void collect_statistics(KlassSizeStats *sz) const;
1061 #endif
1062
1063 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1064 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1065
1066 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1067
1068 address static_field_addr(int offset);
1069
1070 OopMapBlock* start_of_nonstatic_oop_maps() const {
1071 return (OopMapBlock*)(start_of_itable() + itable_length());
1072 }
1073
1074 Klass** end_of_nonstatic_oop_maps() const {
1075 return (Klass**)(start_of_nonstatic_oop_maps() +
1076 nonstatic_oop_map_count());
1077 }
1078
1079 Klass** adr_implementor() const {
1080 if (is_interface()) {
1081 return (Klass**)end_of_nonstatic_oop_maps();
1082 } else {
1083 return NULL;
1084 }
1085 };
1086
1087 InstanceKlass** adr_host_klass() const {
1088 if (is_anonymous()) {
1089 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1090 if (adr_impl != NULL) {
1091 return adr_impl + 1;
1092 } else {
1093 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1094 }
1095 } else {
1096 return NULL;
1097 }
1098 }
1099
1100 address adr_fingerprint() const {
1101 if (has_stored_fingerprint()) {
1102 InstanceKlass** adr_host = adr_host_klass();
1103 if (adr_host != NULL) {
1104 return (address)(adr_host + 1);
1105 }
1106
1107 Klass** adr_impl = adr_implementor();
1108 if (adr_impl != NULL) {
1109 return (address)(adr_impl + 1);
1110 }
1111
1112 return (address)end_of_nonstatic_oop_maps();
1113 } else {
1114 return NULL;
1115 }
1116 }
1117
1118 // Use this to return the size of an instance in heap words:
1119 int size_helper() const {
1120 return layout_helper_to_size_helper(layout_helper());
1121 }
1122
1123 // This bit is initialized in classFileParser.cpp.
1124 // It is false under any of the following conditions:
1125 // - the class is abstract (including any interface)
1126 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1127 // - the class size is larger than FastAllocateSizeLimit
1128 // - the class is java/lang/Class, which cannot be allocated directly
1129 bool can_be_fastpath_allocated() const {
1130 return !layout_helper_needs_slow_path(layout_helper());
1131 }
1132
1133 // Java itable
1134 klassItable itable() const; // return klassItable wrapper
1135 Method* method_at_itable(Klass* holder, int index, TRAPS);
1136
1137 #if INCLUDE_JVMTI
1138 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1139 #endif // INCLUDE_JVMTI
1140
1141 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1142 void clean_implementors_list(BoolObjectClosure* is_alive);
1143 void clean_method_data(BoolObjectClosure* is_alive);
1144
1145 // Explicit metaspace deallocation of fields
1146 // For RedefineClasses and class file parsing errors, we need to deallocate
1147 // instanceKlasses and the metadata they point to.
1148 void deallocate_contents(ClassLoaderData* loader_data);
1149 static void deallocate_methods(ClassLoaderData* loader_data,
1150 Array<Method*>* methods);
1151 void static deallocate_interfaces(ClassLoaderData* loader_data,
1152 const Klass* super_klass,
1153 Array<Klass*>* local_interfaces,
1154 Array<Klass*>* transitive_interfaces);
1155
1156 // The constant pool is on stack if any of the methods are executing or
1157 // referenced by handles.
1158 bool on_stack() const { return _constants->on_stack(); }
1159
1160 // callbacks for actions during class unloading
1161 static void notify_unload_class(InstanceKlass* ik);
1162 static void release_C_heap_structures(InstanceKlass* ik);
1163
1164 // Naming
1165 const char* signature_name() const;
1166 static Symbol* package_from_name(const Symbol* name, TRAPS);
1167
1168 // GC specific object visitors
1169 //
1170 #if INCLUDE_ALL_GCS
1171 // Parallel Scavenge
1172 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1173 // Parallel Compact
1174 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1175 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1176 #endif
1177
1178 // Oop fields (and metadata) iterators
1179 // [nv = true] Use non-virtual calls to do_oop_nv.
1180 // [nv = false] Use virtual calls to do_oop.
1181 //
1182 // The InstanceKlass iterators also visits the Object's klass.
1183
1184 // Forward iteration
1185 public:
1186 // Iterate over all oop fields in the oop maps.
1187 template <bool nv, class OopClosureType>
1188 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1189
1190 protected:
1191 // Iterate over all oop fields and metadata.
1192 template <bool nv, class OopClosureType>
1193 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1194
1195 private:
1196 // Iterate over all oop fields in the oop maps.
1197 // Specialized for [T = oop] or [T = narrowOop].
1198 template <bool nv, typename T, class OopClosureType>
1199 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1200
1201 // Iterate over all oop fields in one oop map.
1202 template <bool nv, typename T, class OopClosureType>
1203 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1204
1205
1206 // Reverse iteration
1207 #if INCLUDE_ALL_GCS
1208 public:
1209 // Iterate over all oop fields in the oop maps.
1210 template <bool nv, class OopClosureType>
1211 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1212
1213 protected:
1214 // Iterate over all oop fields and metadata.
1215 template <bool nv, class OopClosureType>
1216 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1217
1218 private:
1219 // Iterate over all oop fields in the oop maps.
1220 // Specialized for [T = oop] or [T = narrowOop].
1221 template <bool nv, typename T, class OopClosureType>
1222 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1223
1224 // Iterate over all oop fields in one oop map.
1225 template <bool nv, typename T, class OopClosureType>
1226 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1227 #endif
1228
1229
1230 // Bounded range iteration
1231 public:
1232 // Iterate over all oop fields in the oop maps.
1233 template <bool nv, class OopClosureType>
1234 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1235
1236 protected:
1237 // Iterate over all oop fields and metadata.
1238 template <bool nv, class OopClosureType>
1239 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1240
1241 private:
1242 // Iterate over all oop fields in the oop maps.
1243 // Specialized for [T = oop] or [T = narrowOop].
1244 template <bool nv, typename T, class OopClosureType>
1245 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1246
1247 // Iterate over all oop fields in one oop map.
1248 template <bool nv, typename T, class OopClosureType>
1249 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1250
1251
1252 public:
1253
1254 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1255 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1256
1257 #if INCLUDE_ALL_GCS
1258 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1259 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1260 #endif // INCLUDE_ALL_GCS
1261
1262 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1263
1264 public:
1265 void set_in_error_state() {
1266 assert(DumpSharedSpaces, "only call this when dumping archive");
1267 _init_state = initialization_error;
1268 }
1269 bool check_sharing_error_state();
1270
1271 private:
1272 // initialization state
1273 #ifdef ASSERT
1274 void set_init_state(ClassState state);
1275 #else
1276 void set_init_state(ClassState state) { _init_state = (u1)state; }
1277 #endif
1278 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1279 void set_init_thread(Thread *thread) { _init_thread = thread; }
1280
1281 // The RedefineClasses() API can cause new method idnums to be needed
1282 // which will cause the caches to grow. Safety requires different
1283 // cache management logic if the caches can grow instead of just
1284 // going from NULL to non-NULL.
1285 bool idnum_can_increment() const { return has_been_redefined(); }
1286 inline jmethodID* methods_jmethod_ids_acquire() const;
1287 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1288
1289 // Lock during initialization
1290 public:
1291 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1292 // Must be one per class and it has to be a VM internal object so java code
1293 // cannot lock it (like the mirror).
1294 // It has to be an object not a Mutex because it's held through java calls.
1295 oop init_lock() const;
1296 private:
1297 void fence_and_clear_init_lock();
1298
1299 bool link_class_impl (bool throw_verifyerror, TRAPS);
1300 bool verify_code (bool throw_verifyerror, TRAPS);
1301 void initialize_impl (TRAPS);
1302 void initialize_super_interfaces (TRAPS);
1303 void eager_initialize_impl ();
1304 /* jni_id_for_impl for jfieldID only */
1305 JNIid* jni_id_for_impl (int offset);
1306
1307 // Returns the array class for the n'th dimension
1308 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1309
1310 // Returns the array class with this class as element type
1311 Klass* array_klass_impl(bool or_null, TRAPS);
1312
1313 // find a local method (returns NULL if not found)
1314 Method* find_method_impl(const Symbol* name,
1315 const Symbol* signature,
1316 OverpassLookupMode overpass_mode,
1317 StaticLookupMode static_mode,
1318 PrivateLookupMode private_mode) const;
1319
1320 static Method* find_method_impl(const Array<Method*>* methods,
1321 const Symbol* name,
1322 const Symbol* signature,
1323 OverpassLookupMode overpass_mode,
1324 StaticLookupMode static_mode,
1325 PrivateLookupMode private_mode);
1326
1327 // Free CHeap allocated fields.
1328 void release_C_heap_structures();
1329
1330 #if INCLUDE_JVMTI
1331 // RedefineClasses support
1332 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1333 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1334 #endif
1335 public:
1336 // CDS support - remove and restore oops from metadata. Oops are not shared.
1337 virtual void remove_unshareable_info();
1338 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1339
1340 // jvm support
1341 jint compute_modifier_flags(TRAPS) const;
1342
1343 public:
1344 // JVMTI support
1345 jint jvmti_class_status() const;
1346
1347 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1348
1349 public:
1350 // Printing
1351 #ifndef PRODUCT
1352 void print_on(outputStream* st) const;
1353 #endif
1354 void print_value_on(outputStream* st) const;
1355
1356 void oop_print_value_on(oop obj, outputStream* st);
1357
1358 #ifndef PRODUCT
1359 void oop_print_on (oop obj, outputStream* st);
1360
1361 void print_dependent_nmethods(bool verbose = false);
1362 bool is_dependent_nmethod(nmethod* nm);
1363 #endif
1364
1365 const char* internal_name() const;
1366
1367 // Verification
1368 void verify_on(outputStream* st);
1369
1370 void oop_verify_on(oop obj, outputStream* st);
1371
1372 // Logging
1373 void print_class_load_logging(ClassLoaderData* loader_data,
1374 const char* module_name,
1375 const ClassFileStream* cfs) const;
1376 };
1377
1378 // for adding methods
1379 // UNSET_IDNUM return means no more ids available
1380 inline u2 InstanceKlass::next_method_idnum() {
1381 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1382 return ConstMethod::UNSET_IDNUM; // no more ids available
1383 } else {
1384 return _idnum_allocated_count++;
1385 }
1386 }
1387
1388
1389 /* JNIid class for jfieldIDs only */
1390 class JNIid: public CHeapObj<mtClass> {
1391 friend class VMStructs;
1392 private:
1393 Klass* _holder;
1394 JNIid* _next;
1395 int _offset;
1396 #ifdef ASSERT
1397 bool _is_static_field_id;
1398 #endif
1399
1400 public:
1401 // Accessors
1402 Klass* holder() const { return _holder; }
1403 int offset() const { return _offset; }
1404 JNIid* next() { return _next; }
1405 // Constructor
1406 JNIid(Klass* holder, int offset, JNIid* next);
1407 // Identifier lookup
1408 JNIid* find(int offset);
1409
1410 bool find_local_field(fieldDescriptor* fd) {
1411 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1412 }
1413
1414 static void deallocate(JNIid* id);
1415 // Debugging
1416 #ifdef ASSERT
1417 bool is_static_field_id() const { return _is_static_field_id; }
1418 void set_is_static_field_id() { _is_static_field_id = true; }
1419 #endif
1420 void verify(Klass* holder);
1421 };
1422
1423 // An iterator that's used to access the inner classes indices in the
1424 // InstanceKlass::_inner_classes array.
1425 class InnerClassesIterator : public StackObj {
1426 private:
1427 Array<jushort>* _inner_classes;
1428 int _length;
1429 int _idx;
1430 public:
1431
1432 InnerClassesIterator(const InstanceKlass* k) {
1433 _inner_classes = k->inner_classes();
1434 if (k->inner_classes() != NULL) {
1435 _length = _inner_classes->length();
1436 // The inner class array's length should be the multiple of
1437 // inner_class_next_offset if it only contains the InnerClasses
1438 // attribute data, or it should be
1439 // n*inner_class_next_offset+enclosing_method_attribute_size
1440 // if it also contains the EnclosingMethod data.
1441 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1442 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1443 "just checking");
1444 // Remove the enclosing_method portion if exists.
1445 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1446 _length -= InstanceKlass::enclosing_method_attribute_size;
1447 }
1448 } else {
1449 _length = 0;
1450 }
1451 _idx = 0;
1452 }
1453
1454 int length() const {
1455 return _length;
1456 }
1457
1458 void next() {
1459 _idx += InstanceKlass::inner_class_next_offset;
1460 }
1461
1462 bool done() const {
1463 return (_idx >= _length);
1464 }
1465
1466 u2 inner_class_info_index() const {
1467 return _inner_classes->at(
1468 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1469 }
1470
1471 void set_inner_class_info_index(u2 index) {
1472 _inner_classes->at_put(
1473 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1474 }
1475
1476 u2 outer_class_info_index() const {
1477 return _inner_classes->at(
1478 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1479 }
1480
1481 void set_outer_class_info_index(u2 index) {
1482 _inner_classes->at_put(
1483 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1484 }
1485
1486 u2 inner_name_index() const {
1487 return _inner_classes->at(
1488 _idx + InstanceKlass::inner_class_inner_name_offset);
1489 }
1490
1491 void set_inner_name_index(u2 index) {
1492 _inner_classes->at_put(
1493 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1494 }
1495
1496 u2 inner_access_flags() const {
1497 return _inner_classes->at(
1498 _idx + InstanceKlass::inner_class_access_flags_offset);
1499 }
1500 };
1501
1502 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP