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