1 /*
2 * Copyright (c) 1997, 2018, 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_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 "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 SuperTypeClosure;
73
74 // This is used in iterators below.
75 class FieldClosure: public StackObj {
76 public:
77 virtual void do_field(fieldDescriptor* fd) = 0;
78 };
79
80 #ifndef PRODUCT
81 // Print fields.
82 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
83 class FieldPrinter: public FieldClosure {
84 oop _obj;
85 outputStream* _st;
86 public:
87 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
88 void do_field(fieldDescriptor* fd);
89 };
90 #endif // !PRODUCT
91
92 // Describes where oops are located in instances of this klass.
93 class OopMapBlock {
94 public:
95 // Byte offset of the first oop mapped by this block.
96 int offset() const { return _offset; }
97 void set_offset(int offset) { _offset = offset; }
98
99 // Number of oops in this block.
100 uint count() const { return _count; }
101 void set_count(uint count) { _count = count; }
102
103 // sizeof(OopMapBlock) in words.
104 static const int size_in_words() {
105 return align_up((int)sizeof(OopMapBlock), wordSize) >>
106 LogBytesPerWord;
107 }
108
109 private:
110 int _offset;
111 uint _count;
112 };
113
114 struct JvmtiCachedClassFileData;
115
116 class InstanceKlass: public Klass {
117 friend class VMStructs;
118 friend class JVMCIVMStructs;
119 friend class ClassFileParser;
120 friend class CompileReplay;
121
122 public:
123 static const KlassID ID = InstanceKlassID;
124
125 protected:
126 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
127
128 public:
129 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
130
131 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
132 // of the class loading & initialization procedure, and the use of the states.
133 enum ClassState {
134 allocated, // allocated (but not yet linked)
135 loaded, // loaded and inserted in class hierarchy (but not linked yet)
136 linked, // successfully linked/verified (but not initialized yet)
137 being_initialized, // currently running class initializer
138 fully_initialized, // initialized (successfull final state)
139 initialization_error // error happened during initialization
140 };
141
142 private:
143 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
144
145 protected:
146 // If you add a new field that points to any metaspace object, you
147 // must add this field to InstanceKlass::metaspace_pointers_do().
148
149 // Annotations for this class
150 Annotations* _annotations;
151 // Package this class is defined in
152 PackageEntry* _package_entry;
153 // Array classes holding elements of this class.
154 Klass* volatile _array_klasses;
155 // Constant pool for this class.
156 ConstantPool* _constants;
157 // The InnerClasses attribute and EnclosingMethod attribute. The
158 // _inner_classes is an array of shorts. If the class has InnerClasses
159 // attribute, then the _inner_classes array begins with 4-tuples of shorts
160 // [inner_class_info_index, outer_class_info_index,
161 // inner_name_index, inner_class_access_flags] for the InnerClasses
162 // attribute. If the EnclosingMethod attribute exists, it occupies the
163 // last two shorts [class_index, method_index] of the array. If only
164 // the InnerClasses attribute exists, the _inner_classes array length is
165 // number_of_inner_classes * 4. If the class has both InnerClasses
166 // and EnclosingMethod attributes the _inner_classes array length is
167 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
168 Array<jushort>* _inner_classes;
169
170 // The NestMembers attribute. An array of shorts, where each is a
171 // class info index for the class that is a nest member. This data
172 // has not been validated.
173 Array<jushort>* _nest_members;
174
175 // The NestHost attribute. The class info index for the class
176 // that is the nest-host of this class. This data has not been validated.
177 jushort _nest_host_index;
178
179 // Resolved nest-host klass: either true nest-host or self if we are not nested.
180 // By always being set it makes nest-member access checks simpler.
181 InstanceKlass* _nest_host;
182
183 // the source debug extension for this klass, NULL if not specified.
184 // Specified as UTF-8 string without terminating zero byte in the classfile,
185 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
186 const char* _source_debug_extension;
187 // Array name derived from this class which needs unreferencing
188 // if this class is unloaded.
189 Symbol* _array_name;
190
191 // Number of heapOopSize words used by non-static fields in this klass
192 // (including inherited fields but after header_size()).
193 int _nonstatic_field_size;
194 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
195 // Constant pool index to the utf8 entry of the Generic signature,
196 // or 0 if none.
197 u2 _generic_signature_index;
198 // Constant pool index to the utf8 entry for the name of source file
199 // containing this klass, 0 if not specified.
200 u2 _source_file_name_index;
201 u2 _static_oop_field_count;// number of static oop fields in this klass
202 u2 _java_fields_count; // The number of declared Java fields
203 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
204
205 int _itable_len; // length of Java itable (in words)
206 // _is_marked_dependent can be set concurrently, thus cannot be part of the
207 // _misc_flags.
208 bool _is_marked_dependent; // used for marking during flushing and deoptimization
209 bool _is_being_redefined; // used for locking redefinition
210
211 // The low two bits of _misc_flags contains the kind field.
212 // This can be used to quickly discriminate among the four kinds of
213 // InstanceKlass.
214
215 static const unsigned _misc_kind_field_size = 2;
216 static const unsigned _misc_kind_field_pos = 0;
217 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
218
219 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
220 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
221 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
222 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
223
224 // Start after _misc_kind field.
225 enum {
226 _misc_rewritten = 1 << 2, // methods rewritten.
227 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
228 _misc_should_verify_class = 1 << 4, // allow caching of preverification
229 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field
230 _misc_is_contended = 1 << 6, // marked with contended annotation
231 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
232 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
233 _misc_has_been_redefined = 1 << 9, // class has been redefined
234 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
235 // code source was found to be matching the value recorded by AOT.
236 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
237 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
238 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
239 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
240 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
241 };
242 u2 loader_type_bits() {
243 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
244 }
245 u2 _misc_flags;
246 u2 _minor_version; // minor version number of class file
247 u2 _major_version; // major version number of class file
248 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
249 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
250 JNIid* _jni_ids; // First JNI identifier for static fields in this class
251 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
252 intptr_t _dep_context; // packed DependencyContext structure
253 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
254 #if INCLUDE_JVMTI
255 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
256 // Linked instanceKlasses of previous versions
257 InstanceKlass* _previous_versions;
258 // JVMTI fields can be moved to their own structure - see 6315920
259 // JVMTI: cached class file, before retransformable agent modified it in CFLH
260 JvmtiCachedClassFileData* _cached_class_file;
261 #endif
262
263 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
264
265 // Class states are defined as ClassState (see above).
266 // Place the _init_state here to utilize the unused 2-byte after
267 // _idnum_allocated_count.
268 u1 _init_state; // state of class
269 u1 _reference_type; // reference type
270
271 u2 _this_class_index; // constant pool entry
272 #if INCLUDE_JVMTI
273 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
274 #endif
275
276 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
277
278 // Method array.
279 Array<Method*>* _methods;
280 // Default Method Array, concrete methods inherited from interfaces
281 Array<Method*>* _default_methods;
282 // Interfaces (InstanceKlass*s) this class declares locally to implement.
283 Array<InstanceKlass*>* _local_interfaces;
284 // Interfaces (InstanceKlass*s) this class implements transitively.
285 Array<InstanceKlass*>* _transitive_interfaces;
286 // Int array containing the original order of method in the class file (for JVMTI).
287 Array<int>* _method_ordering;
288 // Int array containing the vtable_indices for default_methods
289 // offset matches _default_methods offset
290 Array<int>* _default_vtable_indices;
291
292 // Instance and static variable information, starts with 6-tuples of shorts
293 // [access, name index, sig index, initval index, low_offset, high_offset]
294 // for all fields, followed by the generic signature data at the end of
295 // the array. Only fields with generic signature attributes have the generic
296 // signature data set in the array. The fields array looks like following:
297 //
298 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
299 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
300 // ...
301 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
302 // [generic signature index]
303 // [generic signature index]
304 // ...
305 Array<u2>* _fields;
306
307 // embedded Java vtable follows here
308 // embedded Java itables follows here
309 // embedded static fields follows here
310 // embedded nonstatic oop-map blocks follows here
311 // embedded implementor of this interface follows here
312 // The embedded implementor only exists if the current klass is an
313 // iterface. The possible values of the implementor fall into following
314 // three cases:
315 // NULL: no implementor.
316 // A Klass* that's not itself: one implementor.
317 // Itself: more than one implementors.
318 // embedded unsafe_anonymous_host klass follows here
319 // The embedded host klass only exists in an unsafe anonymous class for
320 // dynamic language support (JSR 292 enabled). The host class grants
321 // its access privileges to this class also. The host class is either
322 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
323 // or an anonymous class loaded through normal classloading does not
324 // have this embedded field.
325 //
326
327 friend class SystemDictionary;
328
329 public:
330 u2 loader_type() {
331 return _misc_flags & loader_type_bits();
332 }
333
334 bool is_shared_boot_class() const {
335 return (_misc_flags & _misc_is_shared_boot_class) != 0;
336 }
337 bool is_shared_platform_class() const {
338 return (_misc_flags & _misc_is_shared_platform_class) != 0;
339 }
340 bool is_shared_app_class() const {
341 return (_misc_flags & _misc_is_shared_app_class) != 0;
342 }
343
344 void clear_class_loader_type() {
345 _misc_flags &= ~loader_type_bits();
346 }
347
348 void set_class_loader_type(s2 loader_type) {
349 switch (loader_type) {
350 case ClassLoader::BOOT_LOADER:
351 _misc_flags |= _misc_is_shared_boot_class;
352 break;
353 case ClassLoader::PLATFORM_LOADER:
354 _misc_flags |= _misc_is_shared_platform_class;
355 break;
356 case ClassLoader::APP_LOADER:
357 _misc_flags |= _misc_is_shared_app_class;
358 break;
359 default:
360 ShouldNotReachHere();
361 break;
362 }
363 }
364
365 bool has_nonstatic_fields() const {
366 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
367 }
368 void set_has_nonstatic_fields(bool b) {
369 if (b) {
370 _misc_flags |= _misc_has_nonstatic_fields;
371 } else {
372 _misc_flags &= ~_misc_has_nonstatic_fields;
373 }
374 }
375
376 // field sizes
377 int nonstatic_field_size() const { return _nonstatic_field_size; }
378 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
379
380 int static_field_size() const { return _static_field_size; }
381 void set_static_field_size(int size) { _static_field_size = size; }
382
383 int static_oop_field_count() const { return (int)_static_oop_field_count; }
384 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
385
386 // Java itable
387 int itable_length() const { return _itable_len; }
388 void set_itable_length(int len) { _itable_len = len; }
389
390 // array klasses
391 Klass* array_klasses() const { return _array_klasses; }
392 inline Klass* array_klasses_acquire() const; // load with acquire semantics
393 void set_array_klasses(Klass* k) { _array_klasses = k; }
394 inline void release_set_array_klasses(Klass* k); // store with release semantics
395
396 // methods
397 Array<Method*>* methods() const { return _methods; }
398 void set_methods(Array<Method*>* a) { _methods = a; }
399 Method* method_with_idnum(int idnum);
400 Method* method_with_orig_idnum(int idnum);
401 Method* method_with_orig_idnum(int idnum, int version);
402
403 // method ordering
404 Array<int>* method_ordering() const { return _method_ordering; }
405 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
406 void copy_method_ordering(const intArray* m, TRAPS);
407
408 // default_methods
409 Array<Method*>* default_methods() const { return _default_methods; }
410 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
411
412 // default method vtable_indices
413 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
414 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
415 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
416
417 // interfaces
418 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
419 void set_local_interfaces(Array<InstanceKlass*>* a) {
420 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
421 _local_interfaces = a; }
422
423 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
424 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
425 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
426 _transitive_interfaces = a;
427 }
428
429 private:
430 friend class fieldDescriptor;
431 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
432
433 public:
434 int field_offset (int index) const { return field(index)->offset(); }
435 int field_access_flags(int index) const { return field(index)->access_flags(); }
436 Symbol* field_name (int index) const { return field(index)->name(constants()); }
437 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
438
439 // Number of Java declared fields
440 int java_fields_count() const { return (int)_java_fields_count; }
441
442 Array<u2>* fields() const { return _fields; }
443 void set_fields(Array<u2>* f, u2 java_fields_count) {
444 guarantee(_fields == NULL || f == NULL, "Just checking");
445 _fields = f;
446 _java_fields_count = java_fields_count;
447 }
448
449 // inner classes
450 Array<u2>* inner_classes() const { return _inner_classes; }
451 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
452
453 // nest members
454 Array<u2>* nest_members() const { return _nest_members; }
455 void set_nest_members(Array<u2>* m) { _nest_members = m; }
456
457 // nest-host index
458 jushort nest_host_index() const { return _nest_host_index; }
459 void set_nest_host_index(u2 i) { _nest_host_index = i; }
460
461 private:
462 // Called to verify that k is a member of this nest - does not look at k's nest-host
463 bool has_nest_member(InstanceKlass* k, TRAPS) const;
464 public:
465 // Returns nest-host class, resolving and validating it if needed
466 // Returns NULL if an exception occurs during loading, or validation fails
467 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
468 // Check if this klass is a nestmate of k - resolves this nest-host and k's
469 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
470
471 enum InnerClassAttributeOffset {
472 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
473 inner_class_inner_class_info_offset = 0,
474 inner_class_outer_class_info_offset = 1,
475 inner_class_inner_name_offset = 2,
476 inner_class_access_flags_offset = 3,
477 inner_class_next_offset = 4
478 };
479
480 enum EnclosingMethodAttributeOffset {
481 enclosing_method_class_index_offset = 0,
482 enclosing_method_method_index_offset = 1,
483 enclosing_method_attribute_size = 2
484 };
485
486 // method override check
487 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
488
489 // package
490 PackageEntry* package() const { return _package_entry; }
491 ModuleEntry* module() const;
492 bool in_unnamed_package() const { return (_package_entry == NULL); }
493 void set_package(PackageEntry* p) { _package_entry = p; }
494 void set_package(ClassLoaderData* loader_data, TRAPS);
495 bool is_same_class_package(const Klass* class2) const;
496 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
497
498 // find an enclosing class
499 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
500
501 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
502 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
503
504 private:
505 // Check prohibited package ("java/" only loadable by boot or platform loaders)
506 static void check_prohibited_package(Symbol* class_name,
507 ClassLoaderData* loader_data,
508 TRAPS);
509 public:
510 // initialization state
511 bool is_loaded() const { return _init_state >= loaded; }
512 bool is_linked() const { return _init_state >= linked; }
513 bool is_initialized() const { return _init_state == fully_initialized; }
514 bool is_not_initialized() const { return _init_state < being_initialized; }
515 bool is_being_initialized() const { return _init_state == being_initialized; }
516 bool is_in_error_state() const { return _init_state == initialization_error; }
517 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
518 ClassState init_state() { return (ClassState)_init_state; }
519 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
520
521 // defineClass specified verification
522 bool should_verify_class() const {
523 return (_misc_flags & _misc_should_verify_class) != 0;
524 }
525 void set_should_verify_class(bool value) {
526 if (value) {
527 _misc_flags |= _misc_should_verify_class;
528 } else {
529 _misc_flags &= ~_misc_should_verify_class;
530 }
531 }
532
533 // marking
534 bool is_marked_dependent() const { return _is_marked_dependent; }
535 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
536
537 // initialization (virtuals from Klass)
538 bool should_be_initialized() const; // means that initialize should be called
539 void initialize(TRAPS);
540 void link_class(TRAPS);
541 bool link_class_or_fail(TRAPS); // returns false on failure
542 void rewrite_class(TRAPS);
543 void link_methods(TRAPS);
544 Method* class_initializer() const;
545
546 // set the class to initialized if no static initializer is present
547 void eager_initialize(Thread *thread);
548
549 // reference type
550 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
551 void set_reference_type(ReferenceType t) {
552 assert(t == (u1)t, "overflow");
553 _reference_type = (u1)t;
554 }
555
556 // this class cp index
557 u2 this_class_index() const { return _this_class_index; }
558 void set_this_class_index(u2 index) { _this_class_index = index; }
559
560 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
561
562 // find local field, returns true if found
563 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
564 // find field in direct superinterfaces, returns the interface in which the field is defined
565 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
566 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
567 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
568 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
569 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
570
571 // find a non-static or static field given its offset within the class.
572 bool contains_field_offset(int offset) {
573 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
574 }
575
576 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
577 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
578
579 // find a local method (returns NULL if not found)
580 Method* find_method(const Symbol* name, const Symbol* signature) const;
581 static Method* find_method(const Array<Method*>* methods,
582 const Symbol* name,
583 const Symbol* signature);
584
585 // find a local method, but skip static methods
586 Method* find_instance_method(const Symbol* name, const Symbol* signature,
587 PrivateLookupMode private_mode = find_private) const;
588 static Method* find_instance_method(const Array<Method*>* methods,
589 const Symbol* name,
590 const Symbol* signature,
591 PrivateLookupMode private_mode = find_private);
592
593 // find a local method (returns NULL if not found)
594 Method* find_local_method(const Symbol* name,
595 const Symbol* signature,
596 OverpassLookupMode overpass_mode,
597 StaticLookupMode static_mode,
598 PrivateLookupMode private_mode) const;
599
600 // find a local method from given methods array (returns NULL if not found)
601 static Method* find_local_method(const Array<Method*>* methods,
602 const Symbol* name,
603 const Symbol* signature,
604 OverpassLookupMode overpass_mode,
605 StaticLookupMode static_mode,
606 PrivateLookupMode private_mode);
607
608 // find a local method index in methods or default_methods (returns -1 if not found)
609 static int find_method_index(const Array<Method*>* methods,
610 const Symbol* name,
611 const Symbol* signature,
612 OverpassLookupMode overpass_mode,
613 StaticLookupMode static_mode,
614 PrivateLookupMode private_mode);
615
616 // lookup operation (returns NULL if not found)
617 Method* uncached_lookup_method(const Symbol* name,
618 const Symbol* signature,
619 OverpassLookupMode overpass_mode,
620 PrivateLookupMode private_mode = find_private) const;
621
622 // lookup a method in all the interfaces that this class implements
623 // (returns NULL if not found)
624 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
625
626 // lookup a method in local defaults then in all interfaces
627 // (returns NULL if not found)
628 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
629
630 // Find method indices by name. If a method with the specified name is
631 // found the index to the first method is returned, and 'end' is filled in
632 // with the index of first non-name-matching method. If no method is found
633 // -1 is returned.
634 int find_method_by_name(const Symbol* name, int* end) const;
635 static int find_method_by_name(const Array<Method*>* methods,
636 const Symbol* name, int* end);
637
638 // constant pool
639 ConstantPool* constants() const { return _constants; }
640 void set_constants(ConstantPool* c) { _constants = c; }
641
642 // protection domain
643 oop protection_domain() const;
644
645 // signers
646 objArrayOop signers() const;
647
648 // host class
649 InstanceKlass* unsafe_anonymous_host() const {
650 InstanceKlass** hk = adr_unsafe_anonymous_host();
651 if (hk == NULL) {
652 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
653 return NULL;
654 } else {
655 assert(*hk != NULL, "host klass should always be set if the address is not null");
656 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
657 return *hk;
658 }
659 }
660 void set_unsafe_anonymous_host(const InstanceKlass* host) {
661 assert(is_unsafe_anonymous(), "not unsafe anonymous");
662 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
663 assert(addr != NULL, "no reversed space");
664 if (addr != NULL) {
665 *addr = host;
666 }
667 }
668 bool is_unsafe_anonymous() const {
669 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
670 }
671 void set_is_unsafe_anonymous(bool value) {
672 if (value) {
673 _misc_flags |= _misc_is_unsafe_anonymous;
674 } else {
675 _misc_flags &= ~_misc_is_unsafe_anonymous;
676 }
677 }
678
679 // Oop that keeps the metadata for this class from being unloaded
680 // in places where the metadata is stored in other places, like nmethods
681 oop klass_holder() const {
682 return (is_unsafe_anonymous()) ? java_mirror() : class_loader();
683 }
684
685 bool is_contended() const {
686 return (_misc_flags & _misc_is_contended) != 0;
687 }
688 void set_is_contended(bool value) {
689 if (value) {
690 _misc_flags |= _misc_is_contended;
691 } else {
692 _misc_flags &= ~_misc_is_contended;
693 }
694 }
695
696 // source file name
697 Symbol* source_file_name() const {
698 return (_source_file_name_index == 0) ?
699 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
700 }
701 u2 source_file_name_index() const {
702 return _source_file_name_index;
703 }
704 void set_source_file_name_index(u2 sourcefile_index) {
705 _source_file_name_index = sourcefile_index;
706 }
707
708 // minor and major version numbers of class file
709 u2 minor_version() const { return _minor_version; }
710 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
711 u2 major_version() const { return _major_version; }
712 void set_major_version(u2 major_version) { _major_version = major_version; }
713
714 // source debug extension
715 const char* source_debug_extension() const { return _source_debug_extension; }
716 void set_source_debug_extension(const char* array, int length);
717
718 // symbol unloading support (refcount already added)
719 Symbol* array_name() { return _array_name; }
720 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
721
722 // nonstatic oop-map blocks
723 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
724 return oop_map_count * OopMapBlock::size_in_words();
725 }
726 unsigned int nonstatic_oop_map_count() const {
727 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
728 }
729 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
730 void set_nonstatic_oop_map_size(int words) {
731 _nonstatic_oop_map_size = words;
732 }
733
734 #if INCLUDE_JVMTI
735 // Redefinition locking. Class can only be redefined by one thread at a time.
736 bool is_being_redefined() const { return _is_being_redefined; }
737 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
738
739 // RedefineClasses() support for previous versions:
740 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
741 void purge_previous_version_list();
742
743 InstanceKlass* previous_versions() const { return _previous_versions; }
744 #else
745 InstanceKlass* previous_versions() const { return NULL; }
746 #endif
747
748 InstanceKlass* get_klass_version(int version) {
749 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
750 if (ik->constants()->version() == version) {
751 return ik;
752 }
753 }
754 return NULL;
755 }
756
757 bool has_been_redefined() const {
758 return (_misc_flags & _misc_has_been_redefined) != 0;
759 }
760 void set_has_been_redefined() {
761 _misc_flags |= _misc_has_been_redefined;
762 }
763
764 bool has_passed_fingerprint_check() const {
765 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
766 }
767 void set_has_passed_fingerprint_check(bool b) {
768 if (b) {
769 _misc_flags |= _misc_has_passed_fingerprint_check;
770 } else {
771 _misc_flags &= ~_misc_has_passed_fingerprint_check;
772 }
773 }
774 bool supers_have_passed_fingerprint_checks();
775
776 static bool should_store_fingerprint(bool is_unsafe_anonymous);
777 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
778 bool has_stored_fingerprint() const;
779 uint64_t get_stored_fingerprint() const;
780 void store_fingerprint(uint64_t fingerprint);
781
782 bool is_scratch_class() const {
783 return (_misc_flags & _misc_is_scratch_class) != 0;
784 }
785
786 void set_is_scratch_class() {
787 _misc_flags |= _misc_is_scratch_class;
788 }
789
790 bool has_resolved_methods() const {
791 return (_misc_flags & _misc_has_resolved_methods) != 0;
792 }
793
794 void set_has_resolved_methods() {
795 _misc_flags |= _misc_has_resolved_methods;
796 }
797 private:
798
799 void set_kind(unsigned kind) {
800 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
801 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
802 unsigned flags = _misc_flags & ~fmask;
803 _misc_flags = (flags | (kind << _misc_kind_field_pos));
804 }
805
806 bool is_kind(unsigned desired) const {
807 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
808 return kind == desired;
809 }
810
811 public:
812
813 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
814 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
815 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
816 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
817 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
818
819 #if INCLUDE_JVMTI
820
821 void init_previous_versions() {
822 _previous_versions = NULL;
823 }
824
825 private:
826 static bool _has_previous_versions;
827 public:
828 static void purge_previous_versions(InstanceKlass* ik) {
829 if (ik->has_been_redefined()) {
830 ik->purge_previous_version_list();
831 }
832 }
833
834 static bool has_previous_versions_and_reset();
835 static bool has_previous_versions() { return _has_previous_versions; }
836
837 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
838 void set_cached_class_file(JvmtiCachedClassFileData *data) {
839 _cached_class_file = data;
840 }
841 JvmtiCachedClassFileData * get_cached_class_file();
842 jint get_cached_class_file_len();
843 unsigned char * get_cached_class_file_bytes();
844
845 // JVMTI: Support for caching of field indices, types, and offsets
846 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
847 _jvmti_cached_class_field_map = descriptor;
848 }
849 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
850 return _jvmti_cached_class_field_map;
851 }
852
853 #if INCLUDE_CDS
854 void set_archived_class_data(JvmtiCachedClassFileData* data) {
855 _cached_class_file = data;
856 }
857
858 JvmtiCachedClassFileData * get_archived_class_data();
859 #endif // INCLUDE_CDS
860 #else // INCLUDE_JVMTI
861
862 static void purge_previous_versions(InstanceKlass* ik) { return; };
863 static bool has_previous_versions_and_reset() { return false; }
864
865 void set_cached_class_file(JvmtiCachedClassFileData *data) {
866 assert(data == NULL, "unexpected call with JVMTI disabled");
867 }
868 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
869
870 #endif // INCLUDE_JVMTI
871
872 bool has_nonstatic_concrete_methods() const {
873 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
874 }
875 void set_has_nonstatic_concrete_methods(bool b) {
876 if (b) {
877 _misc_flags |= _misc_has_nonstatic_concrete_methods;
878 } else {
879 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
880 }
881 }
882
883 bool declares_nonstatic_concrete_methods() const {
884 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
885 }
886 void set_declares_nonstatic_concrete_methods(bool b) {
887 if (b) {
888 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
889 } else {
890 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
891 }
892 }
893
894 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
895 inline u2 next_method_idnum();
896 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
897
898 // generics support
899 Symbol* generic_signature() const {
900 return (_generic_signature_index == 0) ?
901 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
902 }
903 u2 generic_signature_index() const {
904 return _generic_signature_index;
905 }
906 void set_generic_signature_index(u2 sig_index) {
907 _generic_signature_index = sig_index;
908 }
909
910 u2 enclosing_method_data(int offset) const;
911 u2 enclosing_method_class_index() const {
912 return enclosing_method_data(enclosing_method_class_index_offset);
913 }
914 u2 enclosing_method_method_index() {
915 return enclosing_method_data(enclosing_method_method_index_offset);
916 }
917 void set_enclosing_method_indices(u2 class_index,
918 u2 method_index);
919
920 // jmethodID support
921 jmethodID get_jmethod_id(const methodHandle& method_h);
922 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
923 jmethodID new_id, jmethodID* new_jmeths,
924 jmethodID* to_dealloc_id_p,
925 jmethodID** to_dealloc_jmeths_p);
926 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
927 size_t *length_p, jmethodID* id_p);
928 void ensure_space_for_methodids(int start_offset = 0);
929 jmethodID jmethod_id_or_null(Method* method);
930
931 // annotations support
932 Annotations* annotations() const { return _annotations; }
933 void set_annotations(Annotations* anno) { _annotations = anno; }
934
935 AnnotationArray* class_annotations() const {
936 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
937 }
938 Array<AnnotationArray*>* fields_annotations() const {
939 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
940 }
941 AnnotationArray* class_type_annotations() const {
942 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
943 }
944 Array<AnnotationArray*>* fields_type_annotations() const {
945 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
946 }
947 // allocation
948 instanceOop allocate_instance(TRAPS);
949
950 // additional member function to return a handle
951 instanceHandle allocate_instance_handle(TRAPS);
952
953 objArrayOop allocate_objArray(int n, int length, TRAPS);
954 // Helper function
955 static instanceOop register_finalizer(instanceOop i, TRAPS);
956
957 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
958 // if not, throw either an Error or an Exception.
959 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
960
961 // initialization
962 void call_class_initializer(TRAPS);
963 void set_initialization_state_and_notify(ClassState state, TRAPS);
964
965 // OopMapCache support
966 OopMapCache* oop_map_cache() { return _oop_map_cache; }
967 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
968 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
969
970 // JNI identifier support (for static fields - for jni performance)
971 JNIid* jni_ids() { return _jni_ids; }
972 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
973 JNIid* jni_id_for(int offset);
974
975 // maintenance of deoptimization dependencies
976 inline DependencyContext dependencies();
977 int mark_dependent_nmethods(KlassDepChange& changes);
978 void add_dependent_nmethod(nmethod* nm);
979 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
980
981 // On-stack replacement support
982 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
983 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
984 void add_osr_nmethod(nmethod* n);
985 bool remove_osr_nmethod(nmethod* n);
986 int mark_osr_nmethods(const Method* m);
987 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
988
989 #if INCLUDE_JVMTI
990 // Breakpoint support (see methods on Method* for details)
991 BreakpointInfo* breakpoints() const { return _breakpoints; };
992 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
993 #endif
994
995 // support for stub routines
996 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
997 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
998 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
999
1000 // subclass/subinterface checks
1001 bool implements_interface(Klass* k) const;
1002 bool is_same_or_direct_interface(Klass* k) const;
1003
1004 #ifdef ASSERT
1005 // check whether this class or one of its superclasses was redefined
1006 bool has_redefined_this_or_super() const;
1007 #endif
1008
1009 // Access to the implementor of an interface.
1010 Klass* implementor() const;
1011 void set_implementor(Klass* k);
1012 int nof_implementors() const;
1013 void add_implementor(Klass* k); // k is a new class that implements this interface
1014 void init_implementor(); // initialize
1015
1016 // link this class into the implementors list of every interface it implements
1017 void process_interfaces(Thread *thread);
1018
1019 // virtual operations from Klass
1020 bool is_leaf_class() const { return _subklass == NULL; }
1021 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1022 Array<InstanceKlass*>* transitive_interfaces);
1023 bool compute_is_subtype_of(Klass* k);
1024 bool can_be_primary_super_slow() const;
1025 int oop_size(oop obj) const { return size_helper(); }
1026 // slow because it's a virtual call and used for verifying the layout_helper.
1027 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1028 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1029
1030 // Iterators
1031 void do_local_static_fields(FieldClosure* cl);
1032 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1033 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1034
1035 void methods_do(void f(Method* method));
1036 void array_klasses_do(void f(Klass* k));
1037 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1038 bool super_types_do(SuperTypeClosure* blk);
1039
1040 static InstanceKlass* cast(Klass* k) {
1041 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1042 }
1043
1044 static const InstanceKlass* cast(const Klass* k) {
1045 assert(k != NULL, "k should not be null");
1046 assert(k->is_instance_klass(), "cast to InstanceKlass");
1047 return static_cast<const InstanceKlass*>(k);
1048 }
1049
1050 virtual InstanceKlass* java_super() const {
1051 return (super() == NULL) ? NULL : cast(super());
1052 }
1053
1054 // Sizing (in words)
1055 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1056
1057 static int size(int vtable_length, int itable_length,
1058 int nonstatic_oop_map_size,
1059 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1060 return align_metadata_size(header_size() +
1061 vtable_length +
1062 itable_length +
1063 nonstatic_oop_map_size +
1064 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1065 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1066 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1067 }
1068 int size() const { return size(vtable_length(),
1069 itable_length(),
1070 nonstatic_oop_map_size(),
1071 is_interface(),
1072 is_unsafe_anonymous(),
1073 has_stored_fingerprint());
1074 }
1075 #if INCLUDE_SERVICES
1076 virtual void collect_statistics(KlassSizeStats *sz) const;
1077 #endif
1078
1079 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1080 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1081
1082 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1083
1084 oop static_field_base_raw() { return java_mirror(); }
1085
1086 OopMapBlock* start_of_nonstatic_oop_maps() const {
1087 return (OopMapBlock*)(start_of_itable() + itable_length());
1088 }
1089
1090 Klass** end_of_nonstatic_oop_maps() const {
1091 return (Klass**)(start_of_nonstatic_oop_maps() +
1092 nonstatic_oop_map_count());
1093 }
1094
1095 Klass** adr_implementor() const {
1096 if (is_interface()) {
1097 return (Klass**)end_of_nonstatic_oop_maps();
1098 } else {
1099 return NULL;
1100 }
1101 };
1102
1103 InstanceKlass** adr_unsafe_anonymous_host() const {
1104 if (is_unsafe_anonymous()) {
1105 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1106 if (adr_impl != NULL) {
1107 return adr_impl + 1;
1108 } else {
1109 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1110 }
1111 } else {
1112 return NULL;
1113 }
1114 }
1115
1116 address adr_fingerprint() const {
1117 if (has_stored_fingerprint()) {
1118 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1119 if (adr_host != NULL) {
1120 return (address)(adr_host + 1);
1121 }
1122
1123 Klass** adr_impl = adr_implementor();
1124 if (adr_impl != NULL) {
1125 return (address)(adr_impl + 1);
1126 }
1127
1128 return (address)end_of_nonstatic_oop_maps();
1129 } else {
1130 return NULL;
1131 }
1132 }
1133
1134 // Use this to return the size of an instance in heap words:
1135 int size_helper() const {
1136 return layout_helper_to_size_helper(layout_helper());
1137 }
1138
1139 // This bit is initialized in classFileParser.cpp.
1140 // It is false under any of the following conditions:
1141 // - the class is abstract (including any interface)
1142 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1143 // - the class size is larger than FastAllocateSizeLimit
1144 // - the class is java/lang/Class, which cannot be allocated directly
1145 bool can_be_fastpath_allocated() const {
1146 return !layout_helper_needs_slow_path(layout_helper());
1147 }
1148
1149 // Java itable
1150 klassItable itable() const; // return klassItable wrapper
1151 Method* method_at_itable(Klass* holder, int index, TRAPS);
1152
1153 #if INCLUDE_JVMTI
1154 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1155 #endif // INCLUDE_JVMTI
1156
1157 void clean_weak_instanceklass_links();
1158 private:
1159 void clean_implementors_list();
1160 void clean_method_data();
1161
1162 public:
1163 // Explicit metaspace deallocation of fields
1164 // For RedefineClasses and class file parsing errors, we need to deallocate
1165 // instanceKlasses and the metadata they point to.
1166 void deallocate_contents(ClassLoaderData* loader_data);
1167 static void deallocate_methods(ClassLoaderData* loader_data,
1168 Array<Method*>* methods);
1169 void static deallocate_interfaces(ClassLoaderData* loader_data,
1170 const Klass* super_klass,
1171 Array<InstanceKlass*>* local_interfaces,
1172 Array<InstanceKlass*>* transitive_interfaces);
1173
1174 // The constant pool is on stack if any of the methods are executing or
1175 // referenced by handles.
1176 bool on_stack() const { return _constants->on_stack(); }
1177
1178 // callbacks for actions during class unloading
1179 static void unload_class(InstanceKlass* ik);
1180 static void release_C_heap_structures(InstanceKlass* ik);
1181
1182 // Naming
1183 const char* signature_name() const;
1184 static Symbol* package_from_name(const Symbol* name, TRAPS);
1185
1186 // Oop fields (and metadata) iterators
1187 //
1188 // The InstanceKlass iterators also visits the Object's klass.
1189
1190 // Forward iteration
1191 public:
1192 // Iterate over all oop fields in the oop maps.
1193 template <typename T, class OopClosureType>
1194 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1195
1196 // Iterate over all oop fields and metadata.
1197 template <typename T, class OopClosureType>
1198 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1199
1200 // Iterate over all oop fields in one oop map.
1201 template <typename T, class OopClosureType>
1202 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1203
1204
1205 // Reverse iteration
1206 // Iterate over all oop fields and metadata.
1207 template <typename T, class OopClosureType>
1208 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1209
1210 private:
1211 // Iterate over all oop fields in the oop maps.
1212 template <typename T, class OopClosureType>
1213 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1214
1215 // Iterate over all oop fields in one oop map.
1216 template <typename T, class OopClosureType>
1217 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1218
1219
1220 // Bounded range iteration
1221 public:
1222 // Iterate over all oop fields in the oop maps.
1223 template <typename T, class OopClosureType>
1224 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1225
1226 // Iterate over all oop fields and metadata.
1227 template <typename T, class OopClosureType>
1228 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1229
1230 private:
1231 // Iterate over all oop fields in one oop map.
1232 template <typename T, class OopClosureType>
1233 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1234
1235
1236 public:
1237 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1238
1239 public:
1240 void set_in_error_state() {
1241 assert(DumpSharedSpaces, "only call this when dumping archive");
1242 _init_state = initialization_error;
1243 }
1244 bool check_sharing_error_state();
1245
1246 private:
1247 // initialization state
1248 #ifdef ASSERT
1249 void set_init_state(ClassState state);
1250 #else
1251 void set_init_state(ClassState state) { _init_state = (u1)state; }
1252 #endif
1253 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1254 void set_init_thread(Thread *thread) { _init_thread = thread; }
1255
1256 // The RedefineClasses() API can cause new method idnums to be needed
1257 // which will cause the caches to grow. Safety requires different
1258 // cache management logic if the caches can grow instead of just
1259 // going from NULL to non-NULL.
1260 bool idnum_can_increment() const { return has_been_redefined(); }
1261 inline jmethodID* methods_jmethod_ids_acquire() const;
1262 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1263
1264 // Lock during initialization
1265 public:
1266 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1267 // Must be one per class and it has to be a VM internal object so java code
1268 // cannot lock it (like the mirror).
1269 // It has to be an object not a Mutex because it's held through java calls.
1270 oop init_lock() const;
1271 private:
1272 void fence_and_clear_init_lock();
1273
1274 bool link_class_impl (TRAPS);
1275 bool verify_code (TRAPS);
1276 void initialize_impl (TRAPS);
1277 void initialize_super_interfaces (TRAPS);
1278 void eager_initialize_impl ();
1279 /* jni_id_for_impl for jfieldID only */
1280 JNIid* jni_id_for_impl (int offset);
1281
1282 // Returns the array class for the n'th dimension
1283 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1284
1285 // Returns the array class with this class as element type
1286 Klass* array_klass_impl(bool or_null, TRAPS);
1287
1288 // find a local method (returns NULL if not found)
1289 Method* find_method_impl(const Symbol* name,
1290 const Symbol* signature,
1291 OverpassLookupMode overpass_mode,
1292 StaticLookupMode static_mode,
1293 PrivateLookupMode private_mode) const;
1294
1295 static Method* find_method_impl(const Array<Method*>* methods,
1296 const Symbol* name,
1297 const Symbol* signature,
1298 OverpassLookupMode overpass_mode,
1299 StaticLookupMode static_mode,
1300 PrivateLookupMode private_mode);
1301
1302 // Free CHeap allocated fields.
1303 void release_C_heap_structures();
1304
1305 #if INCLUDE_JVMTI
1306 // RedefineClasses support
1307 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1308 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1309 #endif
1310 public:
1311 // CDS support - remove and restore oops from metadata. Oops are not shared.
1312 virtual void remove_unshareable_info();
1313 virtual void remove_java_mirror();
1314 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1315
1316 // jvm support
1317 jint compute_modifier_flags(TRAPS) const;
1318
1319 public:
1320 // JVMTI support
1321 jint jvmti_class_status() const;
1322
1323 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1324
1325 public:
1326 // Printing
1327 #ifndef PRODUCT
1328 void print_on(outputStream* st) const;
1329 #endif
1330 void print_value_on(outputStream* st) const;
1331
1332 void oop_print_value_on(oop obj, outputStream* st);
1333
1334 #ifndef PRODUCT
1335 void oop_print_on (oop obj, outputStream* st);
1336
1337 void print_dependent_nmethods(bool verbose = false);
1338 bool is_dependent_nmethod(nmethod* nm);
1339 bool verify_itable_index(int index);
1340 #endif
1341
1342 const char* internal_name() const;
1343
1344 // Verification
1345 void verify_on(outputStream* st);
1346
1347 void oop_verify_on(oop obj, outputStream* st);
1348
1349 // Logging
1350 void print_class_load_logging(ClassLoaderData* loader_data,
1351 const char* module_name,
1352 const ClassFileStream* cfs) const;
1353 };
1354
1355 // for adding methods
1356 // UNSET_IDNUM return means no more ids available
1357 inline u2 InstanceKlass::next_method_idnum() {
1358 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1359 return ConstMethod::UNSET_IDNUM; // no more ids available
1360 } else {
1361 return _idnum_allocated_count++;
1362 }
1363 }
1364
1365
1366 /* JNIid class for jfieldIDs only */
1367 class JNIid: public CHeapObj<mtClass> {
1368 friend class VMStructs;
1369 private:
1370 Klass* _holder;
1371 JNIid* _next;
1372 int _offset;
1373 #ifdef ASSERT
1374 bool _is_static_field_id;
1375 #endif
1376
1377 public:
1378 // Accessors
1379 Klass* holder() const { return _holder; }
1380 int offset() const { return _offset; }
1381 JNIid* next() { return _next; }
1382 // Constructor
1383 JNIid(Klass* holder, int offset, JNIid* next);
1384 // Identifier lookup
1385 JNIid* find(int offset);
1386
1387 bool find_local_field(fieldDescriptor* fd) {
1388 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1389 }
1390
1391 static void deallocate(JNIid* id);
1392 // Debugging
1393 #ifdef ASSERT
1394 bool is_static_field_id() const { return _is_static_field_id; }
1395 void set_is_static_field_id() { _is_static_field_id = true; }
1396 #endif
1397 void verify(Klass* holder);
1398 };
1399
1400 // An iterator that's used to access the inner classes indices in the
1401 // InstanceKlass::_inner_classes array.
1402 class InnerClassesIterator : public StackObj {
1403 private:
1404 Array<jushort>* _inner_classes;
1405 int _length;
1406 int _idx;
1407 public:
1408
1409 InnerClassesIterator(const InstanceKlass* k) {
1410 _inner_classes = k->inner_classes();
1411 if (k->inner_classes() != NULL) {
1412 _length = _inner_classes->length();
1413 // The inner class array's length should be the multiple of
1414 // inner_class_next_offset if it only contains the InnerClasses
1415 // attribute data, or it should be
1416 // n*inner_class_next_offset+enclosing_method_attribute_size
1417 // if it also contains the EnclosingMethod data.
1418 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1419 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1420 "just checking");
1421 // Remove the enclosing_method portion if exists.
1422 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1423 _length -= InstanceKlass::enclosing_method_attribute_size;
1424 }
1425 } else {
1426 _length = 0;
1427 }
1428 _idx = 0;
1429 }
1430
1431 int length() const {
1432 return _length;
1433 }
1434
1435 void next() {
1436 _idx += InstanceKlass::inner_class_next_offset;
1437 }
1438
1439 bool done() const {
1440 return (_idx >= _length);
1441 }
1442
1443 u2 inner_class_info_index() const {
1444 return _inner_classes->at(
1445 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1446 }
1447
1448 void set_inner_class_info_index(u2 index) {
1449 _inner_classes->at_put(
1450 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1451 }
1452
1453 u2 outer_class_info_index() const {
1454 return _inner_classes->at(
1455 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1456 }
1457
1458 void set_outer_class_info_index(u2 index) {
1459 _inner_classes->at_put(
1460 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1461 }
1462
1463 u2 inner_name_index() const {
1464 return _inner_classes->at(
1465 _idx + InstanceKlass::inner_class_inner_name_offset);
1466 }
1467
1468 void set_inner_name_index(u2 index) {
1469 _inner_classes->at_put(
1470 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1471 }
1472
1473 u2 inner_access_flags() const {
1474 return _inner_classes->at(
1475 _idx + InstanceKlass::inner_class_access_flags_offset);
1476 }
1477 };
1478
1479 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP