1 /*
2 * Copyright (c) 1997, 2019, 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 */
24
25 #ifndef SHARE_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_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 "memory/referenceType.hpp"
33 #include "oops/annotations.hpp"
34 #include "oops/constMethod.hpp"
35 #include "oops/fieldInfo.hpp"
36 #include "oops/instanceOop.hpp"
37 #include "oops/klassVtable.hpp"
38 #include "runtime/handles.hpp"
39 #include "runtime/os.hpp"
40 #include "utilities/accessFlags.hpp"
41 #include "utilities/align.hpp"
42 #include "utilities/macros.hpp"
43 #if INCLUDE_JFR
44 #include "jfr/support/jfrKlassExtension.hpp"
45 #endif
46
47
48 // An InstanceKlass is the VM level representation of a Java class.
49 // It contains all information needed for at class at execution runtime.
50
51 // InstanceKlass embedded field layout (after declared fields):
52 // [EMBEDDED Java vtable ] size in words = vtable_len
53 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
54 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
55 // indicating where oops are located in instances of this klass.
56 // [EMBEDDED implementor of the interface] only exist for interface
57 // [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
58 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
59
60
61 // forward declaration for class -- see below for definition
62 #if INCLUDE_JVMTI
63 class BreakpointInfo;
64 #endif
65 class ClassFileParser;
66 class KlassDepChange;
67 class DependencyContext;
68 class fieldDescriptor;
69 class jniIdMapBase;
70 class JNIid;
71 class JvmtiCachedClassFieldMap;
72 class nmethodBucket;
73 class SuperTypeClosure;
74 class OopMapCache;
75 class InterpreterOopMap;
76
77 // This is used in iterators below.
78 class FieldClosure: public StackObj {
79 public:
80 virtual void do_field(fieldDescriptor* fd) = 0;
81 };
82
83 #ifndef PRODUCT
84 // Print fields.
85 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
86 class FieldPrinter: public FieldClosure {
87 oop _obj;
88 outputStream* _st;
89 public:
90 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
91 void do_field(fieldDescriptor* fd);
92 };
93 #endif // !PRODUCT
94
95 // Describes where oops are located in instances of this klass.
96 class OopMapBlock {
97 public:
98 // Byte offset of the first oop mapped by this block.
99 int offset() const { return _offset; }
100 void set_offset(int offset) { _offset = offset; }
101
102 // Number of oops in this block.
103 uint count() const { return _count; }
104 void set_count(uint count) { _count = count; }
105
106 // sizeof(OopMapBlock) in words.
107 static const int size_in_words() {
108 return align_up((int)sizeof(OopMapBlock), wordSize) >>
109 LogBytesPerWord;
110 }
111
112 private:
113 int _offset;
114 uint _count;
115 };
116
117 struct JvmtiCachedClassFileData;
118
119 class InstanceKlass: public Klass {
120 friend class VMStructs;
121 friend class JVMCIVMStructs;
122 friend class ClassFileParser;
123 friend class CompileReplay;
124
125 public:
126 static const KlassID ID = InstanceKlassID;
127
128 protected:
129 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
130
131 public:
132 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
133
134 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
135 // of the class loading & initialization procedure, and the use of the states.
136 enum ClassState {
137 allocated, // allocated (but not yet linked)
138 loaded, // loaded and inserted in class hierarchy (but not linked yet)
139 linked, // successfully linked/verified (but not initialized yet)
140 being_initialized, // currently running class initializer
141 fully_initialized, // initialized (successfull final state)
142 initialization_error // error happened during initialization
143 };
144
145 private:
146 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
147
148 protected:
149 // If you add a new field that points to any metaspace object, you
150 // must add this field to InstanceKlass::metaspace_pointers_do().
151
152 // Annotations for this class
153 Annotations* _annotations;
154 // Package this class is defined in
155 PackageEntry* _package_entry;
156 // Array classes holding elements of this class.
157 Klass* volatile _array_klasses;
158 // Constant pool for this class.
159 ConstantPool* _constants;
160 // The InnerClasses attribute and EnclosingMethod attribute. The
161 // _inner_classes is an array of shorts. If the class has InnerClasses
162 // attribute, then the _inner_classes array begins with 4-tuples of shorts
163 // [inner_class_info_index, outer_class_info_index,
164 // inner_name_index, inner_class_access_flags] for the InnerClasses
165 // attribute. If the EnclosingMethod attribute exists, it occupies the
166 // last two shorts [class_index, method_index] of the array. If only
167 // the InnerClasses attribute exists, the _inner_classes array length is
168 // number_of_inner_classes * 4. If the class has both InnerClasses
169 // and EnclosingMethod attributes the _inner_classes array length is
170 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
171 Array<jushort>* _inner_classes;
172
173 // The NestMembers attribute. An array of shorts, where each is a
174 // class info index for the class that is a nest member. This data
175 // has not been validated.
176 Array<jushort>* _nest_members;
177
178 // The NestHost attribute. The class info index for the class
179 // that is the nest-host of this class. This data has not been validated.
180 jushort _nest_host_index;
181
182 // Resolved nest-host klass: either true nest-host or self if we are not nested.
183 // By always being set it makes nest-member access checks simpler.
184 InstanceKlass* _nest_host;
185
186 // the source debug extension for this klass, NULL if not specified.
187 // Specified as UTF-8 string without terminating zero byte in the classfile,
188 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
189 const char* _source_debug_extension;
190 // Array name derived from this class which needs unreferencing
191 // if this class is unloaded.
192 Symbol* _array_name;
193
194 // Number of heapOopSize words used by non-static fields in this klass
195 // (including inherited fields but after header_size()).
196 int _nonstatic_field_size;
197 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
198 // Constant pool index to the utf8 entry of the Generic signature,
199 // or 0 if none.
200 u2 _generic_signature_index;
201 // Constant pool index to the utf8 entry for the name of source file
202 // containing this klass, 0 if not specified.
203 u2 _source_file_name_index;
204 u2 _static_oop_field_count;// number of static oop fields in this klass
205 u2 _java_fields_count; // The number of declared Java fields
206 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
207
208 int _itable_len; // length of Java itable (in words)
209
210 int _method_sig_count; // number of method signatures in constant pool
211
212 // _is_marked_dependent can be set concurrently, thus cannot be part of the
213 // _misc_flags.
214 bool _is_marked_dependent; // used for marking during flushing and deoptimization
215 bool _is_being_redefined; // used for locking redefinition
216
217 // The low two bits of _misc_flags contains the kind field.
218 // This can be used to quickly discriminate among the four kinds of
219 // InstanceKlass.
220
221 static const unsigned _misc_kind_field_size = 2;
222 static const unsigned _misc_kind_field_pos = 0;
223 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
224
225 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
226 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
227 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
228 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
229
230 // Start after _misc_kind field.
231 enum {
232 _misc_rewritten = 1 << 2, // methods rewritten.
233 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
234 _misc_should_verify_class = 1 << 4, // allow caching of preverification
235 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field
236 _misc_is_contended = 1 << 6, // marked with contended annotation
237 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
238 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
239 _misc_has_been_redefined = 1 << 9, // class has been redefined
240 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
241 // code source was found to be matching the value recorded by AOT.
242 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
243 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
244 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
245 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
246 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
247 };
248 u2 loader_type_bits() {
249 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
250 }
251 u2 _misc_flags;
252 u2 _minor_version; // minor version number of class file
253 u2 _major_version; // major version number of class file
254 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
255 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
256 JNIid* _jni_ids; // First JNI identifier for static fields in this class
257 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
258 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
259 uint64_t volatile _dep_context_last_cleaned;
260 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
261 #if INCLUDE_JVMTI
262 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
263 // Linked instanceKlasses of previous versions
264 InstanceKlass* _previous_versions;
265 // JVMTI fields can be moved to their own structure - see 6315920
266 // JVMTI: cached class file, before retransformable agent modified it in CFLH
267 JvmtiCachedClassFileData* _cached_class_file;
268 #endif
269
270 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
271
272 // Class states are defined as ClassState (see above).
273 // Place the _init_state here to utilize the unused 2-byte after
274 // _idnum_allocated_count.
275 u1 _init_state; // state of class
276 u1 _reference_type; // reference type
277
278 u2 _this_class_index; // constant pool entry
279 #if INCLUDE_JVMTI
280 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
281 #endif
282
283 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
284
285 // Method array.
286 Array<Method*>* _methods;
287 // Default Method Array, concrete methods inherited from interfaces
288 Array<Method*>* _default_methods;
289 // Interfaces (InstanceKlass*s) this class declares locally to implement.
290 Array<InstanceKlass*>* _local_interfaces;
291 // Interfaces (InstanceKlass*s) this class implements transitively.
292 Array<InstanceKlass*>* _transitive_interfaces;
293 // Int array containing the original order of method in the class file (for JVMTI).
294 Array<int>* _method_ordering;
295 // Int array containing the vtable_indices for default_methods
296 // offset matches _default_methods offset
297 Array<int>* _default_vtable_indices;
298
299 // Instance and static variable information, starts with 6-tuples of shorts
300 // [access, name index, sig index, initval index, low_offset, high_offset]
301 // for all fields, followed by the generic signature data at the end of
302 // the array. Only fields with generic signature attributes have the generic
303 // signature data set in the array. The fields array looks like following:
304 //
305 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
306 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
307 // ...
308 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
309 // [generic signature index]
310 // [generic signature index]
311 // ...
312 Array<u2>* _fields;
313
314 // embedded Java vtable follows here
315 // embedded Java itables follows here
316 // embedded static fields follows here
317 // embedded nonstatic oop-map blocks follows here
318 // embedded implementor of this interface follows here
319 // The embedded implementor only exists if the current klass is an
320 // iterface. The possible values of the implementor fall into following
321 // three cases:
322 // NULL: no implementor.
323 // A Klass* that's not itself: one implementor.
324 // Itself: more than one implementors.
325 // embedded unsafe_anonymous_host klass follows here
326 // The embedded host klass only exists in an unsafe anonymous class for
327 // dynamic language support (JSR 292 enabled). The host class grants
328 // its access privileges to this class also. The host class is either
329 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
330 // or an anonymous class loaded through normal classloading does not
331 // have this embedded field.
332 //
333
334 friend class SystemDictionary;
335
336 public:
337 u2 loader_type() {
338 return _misc_flags & loader_type_bits();
339 }
340
341 bool is_shared_boot_class() const {
342 return (_misc_flags & _misc_is_shared_boot_class) != 0;
343 }
344 bool is_shared_platform_class() const {
345 return (_misc_flags & _misc_is_shared_platform_class) != 0;
346 }
347 bool is_shared_app_class() const {
348 return (_misc_flags & _misc_is_shared_app_class) != 0;
349 }
350
351 void clear_class_loader_type() {
352 _misc_flags &= ~loader_type_bits();
353 }
354
355 void set_class_loader_type(s2 loader_type) {
356 switch (loader_type) {
357 case ClassLoader::BOOT_LOADER:
358 _misc_flags |= _misc_is_shared_boot_class;
359 break;
360 case ClassLoader::PLATFORM_LOADER:
361 _misc_flags |= _misc_is_shared_platform_class;
362 break;
363 case ClassLoader::APP_LOADER:
364 _misc_flags |= _misc_is_shared_app_class;
365 break;
366 default:
367 ShouldNotReachHere();
368 break;
369 }
370 }
371
372 bool has_nonstatic_fields() const {
373 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
374 }
375 void set_has_nonstatic_fields(bool b) {
376 if (b) {
377 _misc_flags |= _misc_has_nonstatic_fields;
378 } else {
379 _misc_flags &= ~_misc_has_nonstatic_fields;
380 }
381 }
382
383 // field sizes
384 int nonstatic_field_size() const { return _nonstatic_field_size; }
385 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
386
387 int static_field_size() const { return _static_field_size; }
388 void set_static_field_size(int size) { _static_field_size = size; }
389
390 int static_oop_field_count() const { return (int)_static_oop_field_count; }
391 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
392
393 // Java itable
394 int itable_length() const { return _itable_len; }
395 void set_itable_length(int len) { _itable_len = len; }
396
397 // Number of constant pool method signatures
398 int method_sig_count() const { return _method_sig_count; }
399 void set_method_sig_count(int count) { _method_sig_count = count; }
400
401 // array klasses
402 Klass* array_klasses() const { return _array_klasses; }
403 inline Klass* array_klasses_acquire() const; // load with acquire semantics
404 void set_array_klasses(Klass* k) { _array_klasses = k; }
405 inline void release_set_array_klasses(Klass* k); // store with release semantics
406
407 // methods
408 Array<Method*>* methods() const { return _methods; }
409 void set_methods(Array<Method*>* a) { _methods = a; }
410 Method* method_with_idnum(int idnum);
411 Method* method_with_orig_idnum(int idnum);
412 Method* method_with_orig_idnum(int idnum, int version);
413
414 // method ordering
415 Array<int>* method_ordering() const { return _method_ordering; }
416 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
417 void copy_method_ordering(const intArray* m, TRAPS);
418
419 // default_methods
420 Array<Method*>* default_methods() const { return _default_methods; }
421 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
422
423 // default method vtable_indices
424 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
425 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
426 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
427
428 // interfaces
429 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
430 void set_local_interfaces(Array<InstanceKlass*>* a) {
431 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
432 _local_interfaces = a; }
433
434 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
435 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
436 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
437 _transitive_interfaces = a;
438 }
439
440 private:
441 friend class fieldDescriptor;
442 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
443
444 public:
445 int field_offset (int index) const { return field(index)->offset(); }
446 int field_access_flags(int index) const { return field(index)->access_flags(); }
447 Symbol* field_name (int index) const { return field(index)->name(constants()); }
448 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
449
450 // Number of Java declared fields
451 int java_fields_count() const { return (int)_java_fields_count; }
452
453 Array<u2>* fields() const { return _fields; }
454 void set_fields(Array<u2>* f, u2 java_fields_count) {
455 guarantee(_fields == NULL || f == NULL, "Just checking");
456 _fields = f;
457 _java_fields_count = java_fields_count;
458 }
459
460 // inner classes
461 Array<u2>* inner_classes() const { return _inner_classes; }
462 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
463
464 // nest members
465 Array<u2>* nest_members() const { return _nest_members; }
466 void set_nest_members(Array<u2>* m) { _nest_members = m; }
467
468 // nest-host index
469 jushort nest_host_index() const { return _nest_host_index; }
470 void set_nest_host_index(u2 i) { _nest_host_index = i; }
471
472 private:
473 // Called to verify that k is a member of this nest - does not look at k's nest-host
474 bool has_nest_member(InstanceKlass* k, TRAPS) const;
475 public:
476 // Returns nest-host class, resolving and validating it if needed
477 // Returns NULL if an exception occurs during loading, or validation fails
478 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
479 // Check if this klass is a nestmate of k - resolves this nest-host and k's
480 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
481
482 enum InnerClassAttributeOffset {
483 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
484 inner_class_inner_class_info_offset = 0,
485 inner_class_outer_class_info_offset = 1,
486 inner_class_inner_name_offset = 2,
487 inner_class_access_flags_offset = 3,
488 inner_class_next_offset = 4
489 };
490
491 enum EnclosingMethodAttributeOffset {
492 enclosing_method_class_index_offset = 0,
493 enclosing_method_method_index_offset = 1,
494 enclosing_method_attribute_size = 2
495 };
496
497 // method override check
498 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
499
500 // package
501 PackageEntry* package() const { return _package_entry; }
502 ModuleEntry* module() const;
503 bool in_unnamed_package() const { return (_package_entry == NULL); }
504 void set_package(PackageEntry* p) { _package_entry = p; }
505 void set_package(ClassLoaderData* loader_data, TRAPS);
506 bool is_same_class_package(const Klass* class2) const;
507 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
508
509 // find an enclosing class
510 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
511
512 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
513 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
514
515 private:
516 // Check prohibited package ("java/" only loadable by boot or platform loaders)
517 static void check_prohibited_package(Symbol* class_name,
518 ClassLoaderData* loader_data,
519 TRAPS);
520 public:
521 // initialization state
522 bool is_loaded() const { return _init_state >= loaded; }
523 bool is_linked() const { return _init_state >= linked; }
524 bool is_initialized() const { return _init_state == fully_initialized; }
525 bool is_not_initialized() const { return _init_state < being_initialized; }
526 bool is_being_initialized() const { return _init_state == being_initialized; }
527 bool is_in_error_state() const { return _init_state == initialization_error; }
528 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
529 ClassState init_state() { return (ClassState)_init_state; }
530 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
531
532 // defineClass specified verification
533 bool should_verify_class() const {
534 return (_misc_flags & _misc_should_verify_class) != 0;
535 }
536 void set_should_verify_class(bool value) {
537 if (value) {
538 _misc_flags |= _misc_should_verify_class;
539 } else {
540 _misc_flags &= ~_misc_should_verify_class;
541 }
542 }
543
544 // marking
545 bool is_marked_dependent() const { return _is_marked_dependent; }
546 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
547
548 // initialization (virtuals from Klass)
549 bool should_be_initialized() const; // means that initialize should be called
550 void initialize(TRAPS);
551 void link_class(TRAPS);
552 bool link_class_or_fail(TRAPS); // returns false on failure
553 void rewrite_class(TRAPS);
554 void link_methods(TRAPS);
555 Method* class_initializer() const;
556
557 // set the class to initialized if no static initializer is present
558 void eager_initialize(Thread *thread);
559
560 // reference type
561 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
562 void set_reference_type(ReferenceType t) {
563 assert(t == (u1)t, "overflow");
564 _reference_type = (u1)t;
565 }
566
567 // this class cp index
568 u2 this_class_index() const { return _this_class_index; }
569 void set_this_class_index(u2 index) { _this_class_index = index; }
570
571 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
572
573 // find local field, returns true if found
574 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
575 // find field in direct superinterfaces, returns the interface in which the field is defined
576 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
577 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
578 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
579 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
580 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
581
582 // find a non-static or static field given its offset within the class.
583 bool contains_field_offset(int offset) {
584 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
585 }
586
587 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
588 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
589
590 // find a local method (returns NULL if not found)
591 Method* find_method(const Symbol* name, const Symbol* signature) const;
592 static Method* find_method(const Array<Method*>* methods,
593 const Symbol* name,
594 const Symbol* signature);
595
596 // find a local method, but skip static methods
597 Method* find_instance_method(const Symbol* name, const Symbol* signature,
598 PrivateLookupMode private_mode = find_private) const;
599 static Method* find_instance_method(const Array<Method*>* methods,
600 const Symbol* name,
601 const Symbol* signature,
602 PrivateLookupMode private_mode = find_private);
603
604 // find a local method (returns NULL if not found)
605 Method* find_local_method(const Symbol* name,
606 const Symbol* signature,
607 OverpassLookupMode overpass_mode,
608 StaticLookupMode static_mode,
609 PrivateLookupMode private_mode) const;
610
611 // find a local method from given methods array (returns NULL if not found)
612 static Method* find_local_method(const Array<Method*>* methods,
613 const Symbol* name,
614 const Symbol* signature,
615 OverpassLookupMode overpass_mode,
616 StaticLookupMode static_mode,
617 PrivateLookupMode private_mode);
618
619 // find a local method index in methods or default_methods (returns -1 if not found)
620 static int find_method_index(const Array<Method*>* methods,
621 const Symbol* name,
622 const Symbol* signature,
623 OverpassLookupMode overpass_mode,
624 StaticLookupMode static_mode,
625 PrivateLookupMode private_mode);
626
627 // lookup operation (returns NULL if not found)
628 Method* uncached_lookup_method(const Symbol* name,
629 const Symbol* signature,
630 OverpassLookupMode overpass_mode,
631 PrivateLookupMode private_mode = find_private) const;
632
633 // lookup a method in all the interfaces that this class implements
634 // (returns NULL if not found)
635 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
636
637 // lookup a method in local defaults then in all interfaces
638 // (returns NULL if not found)
639 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
640
641 // Find method indices by name. If a method with the specified name is
642 // found the index to the first method is returned, and 'end' is filled in
643 // with the index of first non-name-matching method. If no method is found
644 // -1 is returned.
645 int find_method_by_name(const Symbol* name, int* end) const;
646 static int find_method_by_name(const Array<Method*>* methods,
647 const Symbol* name, int* end);
648
649 // constant pool
650 ConstantPool* constants() const { return _constants; }
651 void set_constants(ConstantPool* c) { _constants = c; }
652
653 // protection domain
654 oop protection_domain() const;
655
656 // signers
657 objArrayOop signers() const;
658
659 // host class
660 InstanceKlass* unsafe_anonymous_host() const {
661 InstanceKlass** hk = adr_unsafe_anonymous_host();
662 if (hk == NULL) {
663 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
664 return NULL;
665 } else {
666 assert(*hk != NULL, "host klass should always be set if the address is not null");
667 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
668 return *hk;
669 }
670 }
671 void set_unsafe_anonymous_host(const InstanceKlass* host) {
672 assert(is_unsafe_anonymous(), "not unsafe anonymous");
673 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
674 assert(addr != NULL, "no reversed space");
675 if (addr != NULL) {
676 *addr = host;
677 }
678 }
679 bool is_unsafe_anonymous() const {
680 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
681 }
682 void set_is_unsafe_anonymous(bool value) {
683 if (value) {
684 _misc_flags |= _misc_is_unsafe_anonymous;
685 } else {
686 _misc_flags &= ~_misc_is_unsafe_anonymous;
687 }
688 }
689
690 bool is_contended() const {
691 return (_misc_flags & _misc_is_contended) != 0;
692 }
693 void set_is_contended(bool value) {
694 if (value) {
695 _misc_flags |= _misc_is_contended;
696 } else {
697 _misc_flags &= ~_misc_is_contended;
698 }
699 }
700
701 // source file name
702 Symbol* source_file_name() const {
703 return (_source_file_name_index == 0) ?
704 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
705 }
706 u2 source_file_name_index() const {
707 return _source_file_name_index;
708 }
709 void set_source_file_name_index(u2 sourcefile_index) {
710 _source_file_name_index = sourcefile_index;
711 }
712
713 // minor and major version numbers of class file
714 u2 minor_version() const { return _minor_version; }
715 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
716 u2 major_version() const { return _major_version; }
717 void set_major_version(u2 major_version) { _major_version = major_version; }
718
719 // source debug extension
720 const char* source_debug_extension() const { return _source_debug_extension; }
721 void set_source_debug_extension(const char* array, int length);
722
723 // symbol unloading support (refcount already added)
724 Symbol* array_name() { return _array_name; }
725 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
726
727 // nonstatic oop-map blocks
728 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
729 return oop_map_count * OopMapBlock::size_in_words();
730 }
731 unsigned int nonstatic_oop_map_count() const {
732 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
733 }
734 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
735 void set_nonstatic_oop_map_size(int words) {
736 _nonstatic_oop_map_size = words;
737 }
738
739 #if INCLUDE_JVMTI
740 // Redefinition locking. Class can only be redefined by one thread at a time.
741 bool is_being_redefined() const { return _is_being_redefined; }
742 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
743
744 // RedefineClasses() support for previous versions:
745 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
746 void purge_previous_version_list();
747
748 InstanceKlass* previous_versions() const { return _previous_versions; }
749 #else
750 InstanceKlass* previous_versions() const { return NULL; }
751 #endif
752
753 InstanceKlass* get_klass_version(int version) {
754 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
755 if (ik->constants()->version() == version) {
756 return ik;
757 }
758 }
759 return NULL;
760 }
761
762 bool has_been_redefined() const {
763 return (_misc_flags & _misc_has_been_redefined) != 0;
764 }
765 void set_has_been_redefined() {
766 _misc_flags |= _misc_has_been_redefined;
767 }
768
769 bool has_passed_fingerprint_check() const {
770 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
771 }
772 void set_has_passed_fingerprint_check(bool b) {
773 if (b) {
774 _misc_flags |= _misc_has_passed_fingerprint_check;
775 } else {
776 _misc_flags &= ~_misc_has_passed_fingerprint_check;
777 }
778 }
779 bool supers_have_passed_fingerprint_checks();
780
781 static bool should_store_fingerprint(bool is_unsafe_anonymous);
782 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
783 bool has_stored_fingerprint() const;
784 uint64_t get_stored_fingerprint() const;
785 void store_fingerprint(uint64_t fingerprint);
786
787 bool is_scratch_class() const {
788 return (_misc_flags & _misc_is_scratch_class) != 0;
789 }
790
791 void set_is_scratch_class() {
792 _misc_flags |= _misc_is_scratch_class;
793 }
794
795 bool has_resolved_methods() const {
796 return (_misc_flags & _misc_has_resolved_methods) != 0;
797 }
798
799 void set_has_resolved_methods() {
800 _misc_flags |= _misc_has_resolved_methods;
801 }
802 private:
803
804 void set_kind(unsigned kind) {
805 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
806 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
807 unsigned flags = _misc_flags & ~fmask;
808 _misc_flags = (flags | (kind << _misc_kind_field_pos));
809 }
810
811 bool is_kind(unsigned desired) const {
812 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
813 return kind == desired;
814 }
815
816 public:
817
818 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
819 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
820 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
821 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
822 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
823
824 #if INCLUDE_JVMTI
825
826 void init_previous_versions() {
827 _previous_versions = NULL;
828 }
829
830 private:
831 static bool _has_previous_versions;
832 public:
833 static void purge_previous_versions(InstanceKlass* ik) {
834 if (ik->has_been_redefined()) {
835 ik->purge_previous_version_list();
836 }
837 }
838
839 static bool has_previous_versions_and_reset();
840 static bool has_previous_versions() { return _has_previous_versions; }
841
842 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
843 void set_cached_class_file(JvmtiCachedClassFileData *data) {
844 _cached_class_file = data;
845 }
846 JvmtiCachedClassFileData * get_cached_class_file();
847 jint get_cached_class_file_len();
848 unsigned char * get_cached_class_file_bytes();
849
850 // JVMTI: Support for caching of field indices, types, and offsets
851 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
852 _jvmti_cached_class_field_map = descriptor;
853 }
854 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
855 return _jvmti_cached_class_field_map;
856 }
857 #else // INCLUDE_JVMTI
858
859 static void purge_previous_versions(InstanceKlass* ik) { return; };
860 static bool has_previous_versions_and_reset() { return false; }
861
862 void set_cached_class_file(JvmtiCachedClassFileData *data) {
863 assert(data == NULL, "unexpected call with JVMTI disabled");
864 }
865 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
866
867 #endif // INCLUDE_JVMTI
868
869 bool has_nonstatic_concrete_methods() const {
870 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
871 }
872 void set_has_nonstatic_concrete_methods(bool b) {
873 if (b) {
874 _misc_flags |= _misc_has_nonstatic_concrete_methods;
875 } else {
876 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
877 }
878 }
879
880 bool declares_nonstatic_concrete_methods() const {
881 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
882 }
883 void set_declares_nonstatic_concrete_methods(bool b) {
884 if (b) {
885 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
886 } else {
887 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
888 }
889 }
890
891 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
892 inline u2 next_method_idnum();
893 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
894
895 // generics support
896 Symbol* generic_signature() const {
897 return (_generic_signature_index == 0) ?
898 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
899 }
900 u2 generic_signature_index() const {
901 return _generic_signature_index;
902 }
903 void set_generic_signature_index(u2 sig_index) {
904 _generic_signature_index = sig_index;
905 }
906
907 u2 enclosing_method_data(int offset) const;
908 u2 enclosing_method_class_index() const {
909 return enclosing_method_data(enclosing_method_class_index_offset);
910 }
911 u2 enclosing_method_method_index() {
912 return enclosing_method_data(enclosing_method_method_index_offset);
913 }
914 void set_enclosing_method_indices(u2 class_index,
915 u2 method_index);
916
917 // jmethodID support
918 jmethodID get_jmethod_id(const methodHandle& method_h);
919 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
920 jmethodID new_id, jmethodID* new_jmeths,
921 jmethodID* to_dealloc_id_p,
922 jmethodID** to_dealloc_jmeths_p);
923 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
924 size_t *length_p, jmethodID* id_p);
925 void ensure_space_for_methodids(int start_offset = 0);
926 jmethodID jmethod_id_or_null(Method* method);
927
928 // annotations support
929 Annotations* annotations() const { return _annotations; }
930 void set_annotations(Annotations* anno) { _annotations = anno; }
931
932 AnnotationArray* class_annotations() const {
933 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
934 }
935 Array<AnnotationArray*>* fields_annotations() const {
936 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
937 }
938 AnnotationArray* class_type_annotations() const {
939 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
940 }
941 Array<AnnotationArray*>* fields_type_annotations() const {
942 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
943 }
944 // allocation
945 instanceOop allocate_instance(TRAPS);
946
947 // additional member function to return a handle
948 instanceHandle allocate_instance_handle(TRAPS);
949
950 objArrayOop allocate_objArray(int n, int length, TRAPS);
951 // Helper function
952 static instanceOop register_finalizer(instanceOop i, TRAPS);
953
954 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
955 // if not, throw either an Error or an Exception.
956 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
957
958 // initialization
959 void call_class_initializer(TRAPS);
960 void set_initialization_state_and_notify(ClassState state, TRAPS);
961
962 // OopMapCache support
963 OopMapCache* oop_map_cache() { return _oop_map_cache; }
964 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
965 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
966
967 // JNI identifier support (for static fields - for jni performance)
968 JNIid* jni_ids() { return _jni_ids; }
969 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
970 JNIid* jni_id_for(int offset);
971
972 // maintenance of deoptimization dependencies
973 inline DependencyContext dependencies();
974 int mark_dependent_nmethods(KlassDepChange& changes);
975 void add_dependent_nmethod(nmethod* nm);
976 void remove_dependent_nmethod(nmethod* nm);
977 void clean_dependency_context();
978
979 // On-stack replacement support
980 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
981 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
982 void add_osr_nmethod(nmethod* n);
983 bool remove_osr_nmethod(nmethod* n);
984 int mark_osr_nmethods(const Method* m);
985 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
986
987 #if INCLUDE_JVMTI
988 // Breakpoint support (see methods on Method* for details)
989 BreakpointInfo* breakpoints() const { return _breakpoints; };
990 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
991 #endif
992
993 // support for stub routines
994 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
995 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
996 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
997
998 // subclass/subinterface checks
999 bool implements_interface(Klass* k) const;
1000 bool is_same_or_direct_interface(Klass* k) const;
1001
1002 #ifdef ASSERT
1003 // check whether this class or one of its superclasses was redefined
1004 bool has_redefined_this_or_super() const;
1005 #endif
1006
1007 // Access to the implementor of an interface.
1008 Klass* implementor() const;
1009 void set_implementor(Klass* k);
1010 int nof_implementors() const;
1011 void add_implementor(Klass* k); // k is a new class that implements this interface
1012 void init_implementor(); // initialize
1013
1014 // link this class into the implementors list of every interface it implements
1015 void process_interfaces(Thread *thread);
1016
1017 // virtual operations from Klass
1018 bool is_leaf_class() const { return _subklass == NULL; }
1019 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1020 Array<InstanceKlass*>* transitive_interfaces);
1021 bool can_be_primary_super_slow() const;
1022 int oop_size(oop obj) const { return size_helper(); }
1023 // slow because it's a virtual call and used for verifying the layout_helper.
1024 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1025 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1026
1027 // Iterators
1028 void do_local_static_fields(FieldClosure* cl);
1029 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1030 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1031
1032 void methods_do(void f(Method* method));
1033 void array_klasses_do(void f(Klass* k));
1034 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1035 bool super_types_do(SuperTypeClosure* blk);
1036
1037 static InstanceKlass* cast(Klass* k) {
1038 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1039 }
1040
1041 static const InstanceKlass* cast(const Klass* k) {
1042 assert(k != NULL, "k should not be null");
1043 assert(k->is_instance_klass(), "cast to InstanceKlass");
1044 return static_cast<const InstanceKlass*>(k);
1045 }
1046
1047 virtual InstanceKlass* java_super() const {
1048 return (super() == NULL) ? NULL : cast(super());
1049 }
1050
1051 // Sizing (in words)
1052 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1053
1054 static int size(int vtable_length, int itable_length,
1055 int nonstatic_oop_map_size,
1056 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1057 return align_metadata_size(header_size() +
1058 vtable_length +
1059 itable_length +
1060 nonstatic_oop_map_size +
1061 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1062 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1063 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1064 }
1065 int size() const { return size(vtable_length(),
1066 itable_length(),
1067 nonstatic_oop_map_size(),
1068 is_interface(),
1069 is_unsafe_anonymous(),
1070 has_stored_fingerprint());
1071 }
1072 #if INCLUDE_SERVICES
1073 virtual void collect_statistics(KlassSizeStats *sz) const;
1074 #endif
1075
1076 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1077 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1078
1079 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1080
1081 oop static_field_base_raw() { return java_mirror(); }
1082
1083 OopMapBlock* start_of_nonstatic_oop_maps() const {
1084 return (OopMapBlock*)(start_of_itable() + itable_length());
1085 }
1086
1087 Klass** end_of_nonstatic_oop_maps() const {
1088 return (Klass**)(start_of_nonstatic_oop_maps() +
1089 nonstatic_oop_map_count());
1090 }
1091
1092 Klass* volatile* adr_implementor() const {
1093 if (is_interface()) {
1094 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1095 } else {
1096 return NULL;
1097 }
1098 };
1099
1100 InstanceKlass** adr_unsafe_anonymous_host() const {
1101 if (is_unsafe_anonymous()) {
1102 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1103 if (adr_impl != NULL) {
1104 return adr_impl + 1;
1105 } else {
1106 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1107 }
1108 } else {
1109 return NULL;
1110 }
1111 }
1112
1113 address adr_fingerprint() const {
1114 if (has_stored_fingerprint()) {
1115 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1116 if (adr_host != NULL) {
1117 return (address)(adr_host + 1);
1118 }
1119
1120 Klass* volatile* adr_impl = adr_implementor();
1121 if (adr_impl != NULL) {
1122 return (address)(adr_impl + 1);
1123 }
1124
1125 return (address)end_of_nonstatic_oop_maps();
1126 } else {
1127 return NULL;
1128 }
1129 }
1130
1131 // Use this to return the size of an instance in heap words:
1132 int size_helper() const {
1133 return layout_helper_to_size_helper(layout_helper());
1134 }
1135
1136 // This bit is initialized in classFileParser.cpp.
1137 // It is false under any of the following conditions:
1138 // - the class is abstract (including any interface)
1139 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1140 // - the class size is larger than FastAllocateSizeLimit
1141 // - the class is java/lang/Class, which cannot be allocated directly
1142 bool can_be_fastpath_allocated() const {
1143 return !layout_helper_needs_slow_path(layout_helper());
1144 }
1145
1146 // Java itable
1147 klassItable itable() const; // return klassItable wrapper
1148 Method* method_at_itable(Klass* holder, int index, TRAPS);
1149
1150 #if INCLUDE_JVMTI
1151 void adjust_default_methods(bool* trace_name_printed);
1152 #endif // INCLUDE_JVMTI
1153
1154 void clean_weak_instanceklass_links();
1155 private:
1156 void clean_implementors_list();
1157 void clean_method_data();
1158
1159 public:
1160 // Explicit metaspace deallocation of fields
1161 // For RedefineClasses and class file parsing errors, we need to deallocate
1162 // instanceKlasses and the metadata they point to.
1163 void deallocate_contents(ClassLoaderData* loader_data);
1164 static void deallocate_methods(ClassLoaderData* loader_data,
1165 Array<Method*>* methods);
1166 void static deallocate_interfaces(ClassLoaderData* loader_data,
1167 const Klass* super_klass,
1168 Array<InstanceKlass*>* local_interfaces,
1169 Array<InstanceKlass*>* transitive_interfaces);
1170
1171 // The constant pool is on stack if any of the methods are executing or
1172 // referenced by handles.
1173 bool on_stack() const { return _constants->on_stack(); }
1174
1175 // callbacks for actions during class unloading
1176 static void unload_class(InstanceKlass* ik);
1177 static void release_C_heap_structures(InstanceKlass* ik);
1178
1179 // Naming
1180 const char* signature_name() const;
1181 static Symbol* package_from_name(const Symbol* name, TRAPS);
1182
1183 // Oop fields (and metadata) iterators
1184 //
1185 // The InstanceKlass iterators also visits the Object's klass.
1186
1187 // Forward iteration
1188 public:
1189 // Iterate over all oop fields in the oop maps.
1190 template <typename T, class OopClosureType>
1191 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1192
1193 // Iterate over all oop fields and metadata.
1194 template <typename T, class OopClosureType>
1195 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1196
1197 // Iterate over all oop fields in one oop map.
1198 template <typename T, class OopClosureType>
1199 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1200
1201
1202 // Reverse iteration
1203 // Iterate over all oop fields and metadata.
1204 template <typename T, class OopClosureType>
1205 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1206
1207 private:
1208 // Iterate over all oop fields in the oop maps.
1209 template <typename T, class OopClosureType>
1210 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1211
1212 // Iterate over all oop fields in one oop map.
1213 template <typename T, class OopClosureType>
1214 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1215
1216
1217 // Bounded range iteration
1218 public:
1219 // Iterate over all oop fields in the oop maps.
1220 template <typename T, class OopClosureType>
1221 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1222
1223 // Iterate over all oop fields and metadata.
1224 template <typename T, class OopClosureType>
1225 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1226
1227 private:
1228 // Iterate over all oop fields in one oop map.
1229 template <typename T, class OopClosureType>
1230 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1231
1232
1233 public:
1234 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1235
1236 public:
1237 void set_in_error_state() {
1238 assert(DumpSharedSpaces, "only call this when dumping archive");
1239 _init_state = initialization_error;
1240 }
1241 bool check_sharing_error_state();
1242
1243 private:
1244 // initialization state
1245 void set_init_state(ClassState state);
1246 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1247 void set_init_thread(Thread *thread) { _init_thread = thread; }
1248
1249 // The RedefineClasses() API can cause new method idnums to be needed
1250 // which will cause the caches to grow. Safety requires different
1251 // cache management logic if the caches can grow instead of just
1252 // going from NULL to non-NULL.
1253 bool idnum_can_increment() const { return has_been_redefined(); }
1254 inline jmethodID* methods_jmethod_ids_acquire() const;
1255 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1256
1257 // Lock during initialization
1258 public:
1259 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1260 // Must be one per class and it has to be a VM internal object so java code
1261 // cannot lock it (like the mirror).
1262 // It has to be an object not a Mutex because it's held through java calls.
1263 oop init_lock() const;
1264 private:
1265 void fence_and_clear_init_lock();
1266
1267 bool link_class_impl (TRAPS);
1268 bool verify_code (TRAPS);
1269 void initialize_impl (TRAPS);
1270 void initialize_super_interfaces (TRAPS);
1271 void eager_initialize_impl ();
1272 /* jni_id_for_impl for jfieldID only */
1273 JNIid* jni_id_for_impl (int offset);
1274
1275 // Returns the array class for the n'th dimension
1276 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1277
1278 // Returns the array class with this class as element type
1279 Klass* array_klass_impl(bool or_null, TRAPS);
1280
1281 // find a local method (returns NULL if not found)
1282 Method* find_method_impl(const Symbol* name,
1283 const Symbol* signature,
1284 OverpassLookupMode overpass_mode,
1285 StaticLookupMode static_mode,
1286 PrivateLookupMode private_mode) const;
1287
1288 static Method* find_method_impl(const Array<Method*>* methods,
1289 const Symbol* name,
1290 const Symbol* signature,
1291 OverpassLookupMode overpass_mode,
1292 StaticLookupMode static_mode,
1293 PrivateLookupMode private_mode);
1294
1295 // Free CHeap allocated fields.
1296 void release_C_heap_structures();
1297
1298 #if INCLUDE_JVMTI
1299 // RedefineClasses support
1300 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1301 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1302 #endif
1303 public:
1304 // CDS support - remove and restore oops from metadata. Oops are not shared.
1305 virtual void remove_unshareable_info();
1306 virtual void remove_java_mirror();
1307 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1308
1309 // jvm support
1310 jint compute_modifier_flags(TRAPS) const;
1311
1312 public:
1313 // JVMTI support
1314 jint jvmti_class_status() const;
1315
1316 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1317
1318 public:
1319 // Printing
1320 #ifndef PRODUCT
1321 void print_on(outputStream* st) const;
1322 #endif
1323 void print_value_on(outputStream* st) const;
1324
1325 void oop_print_value_on(oop obj, outputStream* st);
1326
1327 #ifndef PRODUCT
1328 void oop_print_on (oop obj, outputStream* st);
1329
1330 void print_dependent_nmethods(bool verbose = false);
1331 bool is_dependent_nmethod(nmethod* nm);
1332 bool verify_itable_index(int index);
1333 #endif
1334
1335 const char* internal_name() const;
1336
1337 // Verification
1338 void verify_on(outputStream* st);
1339
1340 void oop_verify_on(oop obj, outputStream* st);
1341
1342 // Logging
1343 void print_class_load_logging(ClassLoaderData* loader_data,
1344 const char* module_name,
1345 const ClassFileStream* cfs) const;
1346 };
1347
1348 // for adding methods
1349 // UNSET_IDNUM return means no more ids available
1350 inline u2 InstanceKlass::next_method_idnum() {
1351 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1352 return ConstMethod::UNSET_IDNUM; // no more ids available
1353 } else {
1354 return _idnum_allocated_count++;
1355 }
1356 }
1357
1358
1359 /* JNIid class for jfieldIDs only */
1360 class JNIid: public CHeapObj<mtClass> {
1361 friend class VMStructs;
1362 private:
1363 Klass* _holder;
1364 JNIid* _next;
1365 int _offset;
1366 #ifdef ASSERT
1367 bool _is_static_field_id;
1368 #endif
1369
1370 public:
1371 // Accessors
1372 Klass* holder() const { return _holder; }
1373 int offset() const { return _offset; }
1374 JNIid* next() { return _next; }
1375 // Constructor
1376 JNIid(Klass* holder, int offset, JNIid* next);
1377 // Identifier lookup
1378 JNIid* find(int offset);
1379
1380 bool find_local_field(fieldDescriptor* fd) {
1381 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1382 }
1383
1384 static void deallocate(JNIid* id);
1385 // Debugging
1386 #ifdef ASSERT
1387 bool is_static_field_id() const { return _is_static_field_id; }
1388 void set_is_static_field_id() { _is_static_field_id = true; }
1389 #endif
1390 void verify(Klass* holder);
1391 };
1392
1393 // An iterator that's used to access the inner classes indices in the
1394 // InstanceKlass::_inner_classes array.
1395 class InnerClassesIterator : public StackObj {
1396 private:
1397 Array<jushort>* _inner_classes;
1398 int _length;
1399 int _idx;
1400 public:
1401
1402 InnerClassesIterator(const InstanceKlass* k) {
1403 _inner_classes = k->inner_classes();
1404 if (k->inner_classes() != NULL) {
1405 _length = _inner_classes->length();
1406 // The inner class array's length should be the multiple of
1407 // inner_class_next_offset if it only contains the InnerClasses
1408 // attribute data, or it should be
1409 // n*inner_class_next_offset+enclosing_method_attribute_size
1410 // if it also contains the EnclosingMethod data.
1411 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1412 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1413 "just checking");
1414 // Remove the enclosing_method portion if exists.
1415 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1416 _length -= InstanceKlass::enclosing_method_attribute_size;
1417 }
1418 } else {
1419 _length = 0;
1420 }
1421 _idx = 0;
1422 }
1423
1424 int length() const {
1425 return _length;
1426 }
1427
1428 void next() {
1429 _idx += InstanceKlass::inner_class_next_offset;
1430 }
1431
1432 bool done() const {
1433 return (_idx >= _length);
1434 }
1435
1436 u2 inner_class_info_index() const {
1437 return _inner_classes->at(
1438 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1439 }
1440
1441 void set_inner_class_info_index(u2 index) {
1442 _inner_classes->at_put(
1443 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1444 }
1445
1446 u2 outer_class_info_index() const {
1447 return _inner_classes->at(
1448 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1449 }
1450
1451 void set_outer_class_info_index(u2 index) {
1452 _inner_classes->at_put(
1453 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1454 }
1455
1456 u2 inner_name_index() const {
1457 return _inner_classes->at(
1458 _idx + InstanceKlass::inner_class_inner_name_offset);
1459 }
1460
1461 void set_inner_name_index(u2 index) {
1462 _inner_classes->at_put(
1463 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1464 }
1465
1466 u2 inner_access_flags() const {
1467 return _inner_classes->at(
1468 _idx + InstanceKlass::inner_class_access_flags_offset);
1469 }
1470 };
1471
1472 #endif // SHARE_OOPS_INSTANCEKLASS_HPP