1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/packageEntry.hpp"
32 #include "gc/shared/specialized_oop_closures.hpp"
33 #include "memory/referenceType.hpp"
34 #include "oops/annotations.hpp"
35 #include "oops/constMethod.hpp"
36 #include "oops/fieldInfo.hpp"
37 #include "oops/instanceOop.hpp"
38 #include "oops/klassVtable.hpp"
39 #include "runtime/handles.hpp"
40 #include "runtime/os.hpp"
41 #include "trace/traceMacros.hpp"
42 #include "utilities/accessFlags.hpp"
43 #include "utilities/align.hpp"
44 #include "utilities/macros.hpp"
45
46 // An InstanceKlass is the VM level representation of a Java class.
47 // It contains all information needed for at class at execution runtime.
48
49 // InstanceKlass embedded field layout (after declared fields):
50 // [EMBEDDED Java vtable ] size in words = vtable_len
51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
52 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
53 // indicating where oops are located in instances of this klass.
54 // [EMBEDDED implementor of the interface] only exist for interface
55 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
57
58
59 // forward declaration for class -- see below for definition
60 #if INCLUDE_JVMTI
61 class BreakpointInfo;
62 #endif
63 class ClassFileParser;
64 class KlassDepChange;
65 class DependencyContext;
66 class fieldDescriptor;
67 class jniIdMapBase;
68 class JNIid;
69 class JvmtiCachedClassFieldMap;
70 class SuperTypeClosure;
71
72 // This is used in iterators below.
73 class FieldClosure: public StackObj {
74 public:
75 virtual void do_field(fieldDescriptor* fd) = 0;
76 };
77
78 #ifndef PRODUCT
79 // Print fields.
80 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
81 class FieldPrinter: public FieldClosure {
82 oop _obj;
83 outputStream* _st;
84 public:
85 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
86 void do_field(fieldDescriptor* fd);
87 };
88 #endif // !PRODUCT
89
90 // ValueObjs embedded in klass. Describes where oops are located in instances of
91 // this klass.
92 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
93 public:
94 // Byte offset of the first oop mapped by this block.
95 int offset() const { return _offset; }
96 void set_offset(int offset) { _offset = offset; }
97
98 // Number of oops in this block.
99 uint count() const { return _count; }
100 void set_count(uint count) { _count = count; }
101
102 // sizeof(OopMapBlock) in words.
103 static const int size_in_words() {
104 return align_up((int)sizeof(OopMapBlock), wordSize) >>
105 LogBytesPerWord;
106 }
107
108 private:
109 int _offset;
110 uint _count;
111 };
112
113 struct JvmtiCachedClassFileData;
114
115 class InstanceKlass: public Klass {
116 friend class VMStructs;
117 friend class JVMCIVMStructs;
118 friend class ClassFileParser;
119 friend class CompileReplay;
120
121 protected:
122 InstanceKlass(const ClassFileParser& parser, unsigned kind);
123
124 public:
125 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
126
127 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
128 // of the class loading & initialization procedure, and the use of the states.
129 enum ClassState {
130 allocated, // allocated (but not yet linked)
131 loaded, // loaded and inserted in class hierarchy (but not linked yet)
132 linked, // successfully linked/verified (but not initialized yet)
133 being_initialized, // currently running class initializer
134 fully_initialized, // initialized (successfull final state)
135 initialization_error // error happened during initialization
136 };
137
138 static int number_of_instance_classes() { return _total_instanceKlass_count; }
139
140 private:
141 static volatile int _total_instanceKlass_count;
142 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
143
144 protected:
145 // If you add a new field that points to any metaspace object, you
146 // must add this field to InstanceKlass::metaspace_pointers_do().
147
148 // Annotations for this class
149 Annotations* _annotations;
150 // Package this class is defined in
151 PackageEntry* _package_entry;
152 // Array classes holding elements of this class.
153 Klass* volatile _array_klasses;
154 // Constant pool for this class.
155 ConstantPool* _constants;
156 // The InnerClasses attribute and EnclosingMethod attribute. The
157 // _inner_classes is an array of shorts. If the class has InnerClasses
158 // attribute, then the _inner_classes array begins with 4-tuples of shorts
159 // [inner_class_info_index, outer_class_info_index,
160 // inner_name_index, inner_class_access_flags] for the InnerClasses
161 // attribute. If the EnclosingMethod attribute exists, it occupies the
162 // last two shorts [class_index, method_index] of the array. If only
163 // the InnerClasses attribute exists, the _inner_classes array length is
164 // number_of_inner_classes * 4. If the class has both InnerClasses
165 // and EnclosingMethod attributes the _inner_classes array length is
166 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
167 Array<jushort>* _inner_classes;
168
169 // the source debug extension for this klass, NULL if not specified.
170 // Specified as UTF-8 string without terminating zero byte in the classfile,
171 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
172 const char* _source_debug_extension;
173 // Array name derived from this class which needs unreferencing
174 // if this class is unloaded.
175 Symbol* _array_name;
176
177 // Number of heapOopSize words used by non-static fields in this klass
178 // (including inherited fields but after header_size()).
179 int _nonstatic_field_size;
180 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
181 // Constant pool index to the utf8 entry of the Generic signature,
182 // or 0 if none.
183 u2 _generic_signature_index;
184 // Constant pool index to the utf8 entry for the name of source file
185 // containing this klass, 0 if not specified.
186 u2 _source_file_name_index;
187 u2 _static_oop_field_count;// number of static oop fields in this klass
188 u2 _java_fields_count; // The number of declared Java fields
189 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
190
191 int _itable_len; // length of Java itable (in words)
192 // _is_marked_dependent can be set concurrently, thus cannot be part of the
193 // _misc_flags.
194 bool _is_marked_dependent; // used for marking during flushing and deoptimization
195 bool _is_being_redefined; // used for locking redefinition
196
197 // The low two bits of _misc_flags contains the kind field.
198 // This can be used to quickly discriminate among the four kinds of
199 // InstanceKlass.
200
201 static const unsigned _misc_kind_field_size = 2;
202 static const unsigned _misc_kind_field_pos = 0;
203 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
204
205 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
206 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
207 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
208 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
209
210 // Start after _misc_kind field.
211 enum {
212 _misc_rewritten = 1 << 2, // methods rewritten.
213 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
214 _misc_should_verify_class = 1 << 4, // allow caching of preverification
215 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
216 _misc_is_contended = 1 << 6, // marked with contended annotation
217 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
218 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
219 _misc_has_been_redefined = 1 << 9, // class has been redefined
220 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
221 // code source was found to be matching the value recorded by AOT.
222 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
223 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
224 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
225 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
226 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
227 };
228 u2 loader_type_bits() {
229 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
230 }
231 u2 _misc_flags;
232 u2 _minor_version; // minor version number of class file
233 u2 _major_version; // major version number of class file
234 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
235 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
236 JNIid* _jni_ids; // First JNI identifier for static fields in this class
237 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
238 intptr_t _dep_context; // packed DependencyContext structure
239 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
240 #if INCLUDE_JVMTI
241 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
242 // Linked instanceKlasses of previous versions
243 InstanceKlass* _previous_versions;
244 // JVMTI fields can be moved to their own structure - see 6315920
245 // JVMTI: cached class file, before retransformable agent modified it in CFLH
246 JvmtiCachedClassFileData* _cached_class_file;
247 #endif
248
249 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
250
251 // Class states are defined as ClassState (see above).
252 // Place the _init_state here to utilize the unused 2-byte after
253 // _idnum_allocated_count.
254 u1 _init_state; // state of class
255 u1 _reference_type; // reference type
256
257 #if INCLUDE_JVMTI
258 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
259 #endif
260
261 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
262
263 // Method array.
264 Array<Method*>* _methods;
265 // Default Method Array, concrete methods inherited from interfaces
266 Array<Method*>* _default_methods;
267 // Interface (Klass*s) this class declares locally to implement.
268 Array<Klass*>* _local_interfaces;
269 // Interface (Klass*s) this class implements transitively.
270 Array<Klass*>* _transitive_interfaces;
271 // Int array containing the original order of method in the class file (for JVMTI).
272 Array<int>* _method_ordering;
273 // Int array containing the vtable_indices for default_methods
274 // offset matches _default_methods offset
275 Array<int>* _default_vtable_indices;
276
277 // Instance and static variable information, starts with 6-tuples of shorts
278 // [access, name index, sig index, initval index, low_offset, high_offset]
279 // for all fields, followed by the generic signature data at the end of
280 // the array. Only fields with generic signature attributes have the generic
281 // signature data set in the array. The fields array looks like following:
282 //
283 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
284 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
285 // ...
286 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
287 // [generic signature index]
288 // [generic signature index]
289 // ...
290 Array<u2>* _fields;
291
292 // embedded Java vtable follows here
293 // embedded Java itables follows here
294 // embedded static fields follows here
295 // embedded nonstatic oop-map blocks follows here
296 // embedded implementor of this interface follows here
297 // The embedded implementor only exists if the current klass is an
298 // iterface. The possible values of the implementor fall into following
299 // three cases:
300 // NULL: no implementor.
301 // A Klass* that's not itself: one implementor.
302 // Itself: more than one implementors.
303 // embedded host klass follows here
304 // The embedded host klass only exists in an anonymous class for
305 // dynamic language support (JSR 292 enabled). The host class grants
306 // its access privileges to this class also. The host class is either
307 // named, or a previously loaded anonymous class. A non-anonymous class
308 // or an anonymous class loaded through normal classloading does not
309 // have this embedded field.
310 //
311
312 friend class SystemDictionary;
313
314 public:
315 u2 loader_type() {
316 return _misc_flags & loader_type_bits();
317 }
318
319 bool is_shared_boot_class() const {
320 return (_misc_flags & _misc_is_shared_boot_class) != 0;
321 }
322 bool is_shared_platform_class() const {
323 return (_misc_flags & _misc_is_shared_platform_class) != 0;
324 }
325 bool is_shared_app_class() const {
326 return (_misc_flags & _misc_is_shared_app_class) != 0;
327 }
328
329 void set_class_loader_type(s2 loader_type) {
330 switch (loader_type) {
331 case ClassLoader::BOOT_LOADER:
332 _misc_flags |= _misc_is_shared_boot_class;
333 break;
334 case ClassLoader::PLATFORM_LOADER:
335 _misc_flags |= _misc_is_shared_platform_class;
336 break;
337 case ClassLoader::APP_LOADER:
338 _misc_flags |= _misc_is_shared_app_class;
339 break;
340 default:
341 ShouldNotReachHere();
342 break;
343 }
344 }
345
346 bool has_nonstatic_fields() const {
347 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
348 }
349 void set_has_nonstatic_fields(bool b) {
350 if (b) {
351 _misc_flags |= _misc_has_nonstatic_fields;
352 } else {
353 _misc_flags &= ~_misc_has_nonstatic_fields;
354 }
355 }
356
357 // field sizes
358 int nonstatic_field_size() const { return _nonstatic_field_size; }
359 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
360
361 int static_field_size() const { return _static_field_size; }
362 void set_static_field_size(int size) { _static_field_size = size; }
363
364 int static_oop_field_count() const { return (int)_static_oop_field_count; }
365 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
366
367 // Java itable
368 int itable_length() const { return _itable_len; }
369 void set_itable_length(int len) { _itable_len = len; }
370
371 // array klasses
372 Klass* array_klasses() const { return _array_klasses; }
373 inline Klass* array_klasses_acquire() const; // load with acquire semantics
374 void set_array_klasses(Klass* k) { _array_klasses = k; }
375 inline void release_set_array_klasses(Klass* k); // store with release semantics
376
377 // methods
378 Array<Method*>* methods() const { return _methods; }
379 void set_methods(Array<Method*>* a) { _methods = a; }
380 Method* method_with_idnum(int idnum);
381 Method* method_with_orig_idnum(int idnum);
382 Method* method_with_orig_idnum(int idnum, int version);
383
384 // method ordering
385 Array<int>* method_ordering() const { return _method_ordering; }
386 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
387 void copy_method_ordering(const intArray* m, TRAPS);
388
389 // default_methods
390 Array<Method*>* default_methods() const { return _default_methods; }
391 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
392
393 // default method vtable_indices
394 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
395 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
396 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
397
398 // interfaces
399 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
400 void set_local_interfaces(Array<Klass*>* a) {
401 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
402 _local_interfaces = a; }
403
404 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
405 void set_transitive_interfaces(Array<Klass*>* a) {
406 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
407 _transitive_interfaces = a;
408 }
409
410 private:
411 friend class fieldDescriptor;
412 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
413
414 public:
415 int field_offset (int index) const { return field(index)->offset(); }
416 int field_access_flags(int index) const { return field(index)->access_flags(); }
417 Symbol* field_name (int index) const { return field(index)->name(constants()); }
418 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
419
420 // Number of Java declared fields
421 int java_fields_count() const { return (int)_java_fields_count; }
422
423 Array<u2>* fields() const { return _fields; }
424 void set_fields(Array<u2>* f, u2 java_fields_count) {
425 guarantee(_fields == NULL || f == NULL, "Just checking");
426 _fields = f;
427 _java_fields_count = java_fields_count;
428 }
429
430 // inner classes
431 Array<u2>* inner_classes() const { return _inner_classes; }
432 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
433
434 enum InnerClassAttributeOffset {
435 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
436 inner_class_inner_class_info_offset = 0,
437 inner_class_outer_class_info_offset = 1,
438 inner_class_inner_name_offset = 2,
439 inner_class_access_flags_offset = 3,
440 inner_class_next_offset = 4
441 };
442
443 enum EnclosingMethodAttributeOffset {
444 enclosing_method_class_index_offset = 0,
445 enclosing_method_method_index_offset = 1,
446 enclosing_method_attribute_size = 2
447 };
448
449 // method override check
450 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
451
452 // package
453 PackageEntry* package() const { return _package_entry; }
454 ModuleEntry* module() const;
455 bool in_unnamed_package() const { return (_package_entry == NULL); }
456 void set_package(PackageEntry* p) { _package_entry = p; }
457 void set_package(ClassLoaderData* loader_data, TRAPS);
458 bool is_same_class_package(const Klass* class2) const;
459 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
460
461 // find an enclosing class
462 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
463
464 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
465 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
466
467 private:
468 // Check prohibited package ("java/" only loadable by boot or platform loaders)
469 static void check_prohibited_package(Symbol* class_name,
470 Handle class_loader,
471 TRAPS);
472 public:
473 // tell if two classes have the same enclosing class (at package level)
474 bool is_same_package_member(const Klass* class2, TRAPS) const;
475
476 // initialization state
477 bool is_loaded() const { return _init_state >= loaded; }
478 bool is_linked() const { return _init_state >= linked; }
479 bool is_initialized() const { return _init_state == fully_initialized; }
480 bool is_not_initialized() const { return _init_state < being_initialized; }
481 bool is_being_initialized() const { return _init_state == being_initialized; }
482 bool is_in_error_state() const { return _init_state == initialization_error; }
483 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
484 ClassState init_state() { return (ClassState)_init_state; }
485 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
486
487 // defineClass specified verification
488 bool should_verify_class() const {
489 return (_misc_flags & _misc_should_verify_class) != 0;
490 }
491 void set_should_verify_class(bool value) {
492 if (value) {
493 _misc_flags |= _misc_should_verify_class;
494 } else {
495 _misc_flags &= ~_misc_should_verify_class;
496 }
497 }
498
499 // marking
500 bool is_marked_dependent() const { return _is_marked_dependent; }
501 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
502
503 // initialization (virtuals from Klass)
504 bool should_be_initialized() const; // means that initialize should be called
505 void initialize(TRAPS);
506 void link_class(TRAPS);
507 bool link_class_or_fail(TRAPS); // returns false on failure
508 void unlink_class();
509 void rewrite_class(TRAPS);
510 void link_methods(TRAPS);
511 Method* class_initializer() const;
512
513 // set the class to initialized if no static initializer is present
514 void eager_initialize(Thread *thread);
515
516 // reference type
517 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
518 void set_reference_type(ReferenceType t) {
519 assert(t == (u1)t, "overflow");
520 _reference_type = (u1)t;
521 }
522
523 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
524
525 // find local field, returns true if found
526 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
527 // find field in direct superinterfaces, returns the interface in which the field is defined
528 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
529 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
530 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
531 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
532 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
533
534 // find a non-static or static field given its offset within the class.
535 bool contains_field_offset(int offset) {
536 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
537 }
538
539 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
540 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
541
542 // find a local method (returns NULL if not found)
543 Method* find_method(const Symbol* name, const Symbol* signature) const;
544 static Method* find_method(const Array<Method*>* methods,
545 const Symbol* name,
546 const Symbol* signature);
547
548 // find a local method, but skip static methods
549 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
550 static Method* find_instance_method(const Array<Method*>* methods,
551 const Symbol* name,
552 const Symbol* signature);
553
554 // find a local method (returns NULL if not found)
555 Method* find_local_method(const Symbol* name,
556 const Symbol* signature,
557 OverpassLookupMode overpass_mode,
558 StaticLookupMode static_mode,
559 PrivateLookupMode private_mode) const;
560
561 // find a local method from given methods array (returns NULL if not found)
562 static Method* find_local_method(const Array<Method*>* methods,
563 const Symbol* name,
564 const Symbol* signature,
565 OverpassLookupMode overpass_mode,
566 StaticLookupMode static_mode,
567 PrivateLookupMode private_mode);
568
569 // find a local method index in methods or default_methods (returns -1 if not found)
570 static int find_method_index(const Array<Method*>* methods,
571 const Symbol* name,
572 const Symbol* signature,
573 OverpassLookupMode overpass_mode,
574 StaticLookupMode static_mode,
575 PrivateLookupMode private_mode);
576
577 // lookup operation (returns NULL if not found)
578 Method* uncached_lookup_method(const Symbol* name,
579 const Symbol* signature,
580 OverpassLookupMode overpass_mode) const;
581
582 // lookup a method in all the interfaces that this class implements
583 // (returns NULL if not found)
584 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
585
586 // lookup a method in local defaults then in all interfaces
587 // (returns NULL if not found)
588 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
589
590 // Find method indices by name. If a method with the specified name is
591 // found the index to the first method is returned, and 'end' is filled in
592 // with the index of first non-name-matching method. If no method is found
593 // -1 is returned.
594 int find_method_by_name(const Symbol* name, int* end) const;
595 static int find_method_by_name(const Array<Method*>* methods,
596 const Symbol* name, int* end);
597
598 // constant pool
599 ConstantPool* constants() const { return _constants; }
600 void set_constants(ConstantPool* c) { _constants = c; }
601
602 // protection domain
603 oop protection_domain() const;
604
605 // signers
606 objArrayOop signers() const;
607
608 // host class
609 InstanceKlass* host_klass() const {
610 InstanceKlass** hk = adr_host_klass();
611 if (hk == NULL) {
612 return NULL;
613 } else {
614 assert(*hk != NULL, "host klass should always be set if the address is not null");
615 return *hk;
616 }
617 }
618 void set_host_klass(const InstanceKlass* host) {
619 assert(is_anonymous(), "not anonymous");
620 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
621 assert(addr != NULL, "no reversed space");
622 if (addr != NULL) {
623 *addr = host;
624 }
625 }
626 bool is_anonymous() const {
627 return (_misc_flags & _misc_is_anonymous) != 0;
628 }
629 void set_is_anonymous(bool value) {
630 if (value) {
631 _misc_flags |= _misc_is_anonymous;
632 } else {
633 _misc_flags &= ~_misc_is_anonymous;
634 }
635 }
636
637 // Oop that keeps the metadata for this class from being unloaded
638 // in places where the metadata is stored in other places, like nmethods
639 oop klass_holder() const {
640 return is_anonymous() ? java_mirror() : class_loader();
641 }
642
643 bool is_contended() const {
644 return (_misc_flags & _misc_is_contended) != 0;
645 }
646 void set_is_contended(bool value) {
647 if (value) {
648 _misc_flags |= _misc_is_contended;
649 } else {
650 _misc_flags &= ~_misc_is_contended;
651 }
652 }
653
654 // source file name
655 Symbol* source_file_name() const {
656 return (_source_file_name_index == 0) ?
657 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
658 }
659 u2 source_file_name_index() const {
660 return _source_file_name_index;
661 }
662 void set_source_file_name_index(u2 sourcefile_index) {
663 _source_file_name_index = sourcefile_index;
664 }
665
666 // minor and major version numbers of class file
667 u2 minor_version() const { return _minor_version; }
668 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
669 u2 major_version() const { return _major_version; }
670 void set_major_version(u2 major_version) { _major_version = major_version; }
671
672 // source debug extension
673 const char* source_debug_extension() const { return _source_debug_extension; }
674 void set_source_debug_extension(const char* array, int length);
675
676 // symbol unloading support (refcount already added)
677 Symbol* array_name() { return _array_name; }
678 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
679
680 // nonstatic oop-map blocks
681 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
682 return oop_map_count * OopMapBlock::size_in_words();
683 }
684 unsigned int nonstatic_oop_map_count() const {
685 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
686 }
687 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
688 void set_nonstatic_oop_map_size(int words) {
689 _nonstatic_oop_map_size = words;
690 }
691
692 #if INCLUDE_JVMTI
693 // Redefinition locking. Class can only be redefined by one thread at a time.
694 bool is_being_redefined() const { return _is_being_redefined; }
695 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
696
697 // RedefineClasses() support for previous versions:
698 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
699 void purge_previous_version_list();
700
701 InstanceKlass* previous_versions() const { return _previous_versions; }
702 #else
703 InstanceKlass* previous_versions() const { return NULL; }
704 #endif
705
706 InstanceKlass* get_klass_version(int version) {
707 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
708 if (ik->constants()->version() == version) {
709 return ik;
710 }
711 }
712 return NULL;
713 }
714
715 bool has_been_redefined() const {
716 return (_misc_flags & _misc_has_been_redefined) != 0;
717 }
718 void set_has_been_redefined() {
719 _misc_flags |= _misc_has_been_redefined;
720 }
721
722 bool has_passed_fingerprint_check() const {
723 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
724 }
725 void set_has_passed_fingerprint_check(bool b) {
726 if (b) {
727 _misc_flags |= _misc_has_passed_fingerprint_check;
728 } else {
729 _misc_flags &= ~_misc_has_passed_fingerprint_check;
730 }
731 }
732 bool supers_have_passed_fingerprint_checks();
733
734 static bool should_store_fingerprint();
735 bool has_stored_fingerprint() const;
736 uint64_t get_stored_fingerprint() const;
737 void store_fingerprint(uint64_t fingerprint);
738
739 bool is_scratch_class() const {
740 return (_misc_flags & _misc_is_scratch_class) != 0;
741 }
742
743 void set_is_scratch_class() {
744 _misc_flags |= _misc_is_scratch_class;
745 }
746
747 bool has_resolved_methods() const {
748 return (_misc_flags & _misc_has_resolved_methods) != 0;
749 }
750
751 void set_has_resolved_methods() {
752 _misc_flags |= _misc_has_resolved_methods;
753 }
754 private:
755
756 void set_kind(unsigned kind) {
757 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
758 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
759 unsigned flags = _misc_flags & ~fmask;
760 _misc_flags = (flags | (kind << _misc_kind_field_pos));
761 }
762
763 bool is_kind(unsigned desired) const {
764 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
765 return kind == desired;
766 }
767
768 public:
769
770 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
771 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
772 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
773 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
774 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
775
776 #if INCLUDE_JVMTI
777
778 void init_previous_versions() {
779 _previous_versions = NULL;
780 }
781
782 private:
783 static bool _has_previous_versions;
784 public:
785 static void purge_previous_versions(InstanceKlass* ik) {
786 if (ik->has_been_redefined()) {
787 ik->purge_previous_version_list();
788 }
789 }
790
791 static bool has_previous_versions_and_reset();
792
793 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
794 void set_cached_class_file(JvmtiCachedClassFileData *data) {
795 _cached_class_file = data;
796 }
797 JvmtiCachedClassFileData * get_cached_class_file();
798 jint get_cached_class_file_len();
799 unsigned char * get_cached_class_file_bytes();
800
801 // JVMTI: Support for caching of field indices, types, and offsets
802 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
803 _jvmti_cached_class_field_map = descriptor;
804 }
805 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
806 return _jvmti_cached_class_field_map;
807 }
808
809 #if INCLUDE_CDS
810 void set_archived_class_data(JvmtiCachedClassFileData* data) {
811 _cached_class_file = data;
812 }
813
814 JvmtiCachedClassFileData * get_archived_class_data();
815 #endif // INCLUDE_CDS
816 #else // INCLUDE_JVMTI
817
818 static void purge_previous_versions(InstanceKlass* ik) { return; };
819 static bool has_previous_versions_and_reset() { return false; }
820
821 void set_cached_class_file(JvmtiCachedClassFileData *data) {
822 assert(data == NULL, "unexpected call with JVMTI disabled");
823 }
824 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
825
826 #endif // INCLUDE_JVMTI
827
828 bool has_nonstatic_concrete_methods() const {
829 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
830 }
831 void set_has_nonstatic_concrete_methods(bool b) {
832 if (b) {
833 _misc_flags |= _misc_has_nonstatic_concrete_methods;
834 } else {
835 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
836 }
837 }
838
839 bool declares_nonstatic_concrete_methods() const {
840 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
841 }
842 void set_declares_nonstatic_concrete_methods(bool b) {
843 if (b) {
844 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
845 } else {
846 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
847 }
848 }
849
850 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
851 inline u2 next_method_idnum();
852 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
853
854 // generics support
855 Symbol* generic_signature() const {
856 return (_generic_signature_index == 0) ?
857 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
858 }
859 u2 generic_signature_index() const {
860 return _generic_signature_index;
861 }
862 void set_generic_signature_index(u2 sig_index) {
863 _generic_signature_index = sig_index;
864 }
865
866 u2 enclosing_method_data(int offset) const;
867 u2 enclosing_method_class_index() const {
868 return enclosing_method_data(enclosing_method_class_index_offset);
869 }
870 u2 enclosing_method_method_index() {
871 return enclosing_method_data(enclosing_method_method_index_offset);
872 }
873 void set_enclosing_method_indices(u2 class_index,
874 u2 method_index);
875
876 // jmethodID support
877 jmethodID get_jmethod_id(const methodHandle& method_h);
878 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
879 jmethodID new_id, jmethodID* new_jmeths,
880 jmethodID* to_dealloc_id_p,
881 jmethodID** to_dealloc_jmeths_p);
882 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
883 size_t *length_p, jmethodID* id_p);
884 void ensure_space_for_methodids(int start_offset = 0);
885 jmethodID jmethod_id_or_null(Method* method);
886
887 // annotations support
888 Annotations* annotations() const { return _annotations; }
889 void set_annotations(Annotations* anno) { _annotations = anno; }
890
891 AnnotationArray* class_annotations() const {
892 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
893 }
894 Array<AnnotationArray*>* fields_annotations() const {
895 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
896 }
897 AnnotationArray* class_type_annotations() const {
898 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
899 }
900 Array<AnnotationArray*>* fields_type_annotations() const {
901 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
902 }
903 // allocation
904 instanceOop allocate_instance(TRAPS);
905
906 // additional member function to return a handle
907 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
908
909 objArrayOop allocate_objArray(int n, int length, TRAPS);
910 // Helper function
911 static instanceOop register_finalizer(instanceOop i, TRAPS);
912
913 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
914 // if not, throw either an Error or an Exception.
915 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
916
917 // initialization
918 void call_class_initializer(TRAPS);
919 void set_initialization_state_and_notify(ClassState state, TRAPS);
920
921 // OopMapCache support
922 OopMapCache* oop_map_cache() { return _oop_map_cache; }
923 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
924 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
925
926 // JNI identifier support (for static fields - for jni performance)
927 JNIid* jni_ids() { return _jni_ids; }
928 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
929 JNIid* jni_id_for(int offset);
930
931 // maintenance of deoptimization dependencies
932 inline DependencyContext dependencies();
933 int mark_dependent_nmethods(KlassDepChange& changes);
934 void add_dependent_nmethod(nmethod* nm);
935 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
936
937 // On-stack replacement support
938 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
939 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
940 void add_osr_nmethod(nmethod* n);
941 bool remove_osr_nmethod(nmethod* n);
942 int mark_osr_nmethods(const Method* m);
943 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
944
945 #if INCLUDE_JVMTI
946 // Breakpoint support (see methods on Method* for details)
947 BreakpointInfo* breakpoints() const { return _breakpoints; };
948 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
949 #endif
950
951 // support for stub routines
952 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
953 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
954 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
955
956 // subclass/subinterface checks
957 bool implements_interface(Klass* k) const;
958 bool is_same_or_direct_interface(Klass* k) const;
959
960 #ifdef ASSERT
961 // check whether this class or one of its superclasses was redefined
962 bool has_redefined_this_or_super() const;
963 #endif
964
965 // Access to the implementor of an interface.
966 Klass* implementor() const
967 {
968 Klass** k = adr_implementor();
969 if (k == NULL) {
970 return NULL;
971 } else {
972 return *k;
973 }
974 }
975
976 void set_implementor(Klass* k) {
977 assert(is_interface(), "not interface");
978 Klass** addr = adr_implementor();
979 assert(addr != NULL, "null addr");
980 if (addr != NULL) {
981 *addr = k;
982 }
983 }
984
985 int nof_implementors() const {
986 Klass* k = implementor();
987 if (k == NULL) {
988 return 0;
989 } else if (k != this) {
990 return 1;
991 } else {
992 return 2;
993 }
994 }
995
996 void add_implementor(Klass* k); // k is a new class that implements this interface
997 void init_implementor(); // initialize
998
999 // link this class into the implementors list of every interface it implements
1000 void process_interfaces(Thread *thread);
1001
1002 // virtual operations from Klass
1003 bool is_leaf_class() const { return _subklass == NULL; }
1004 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1005 bool compute_is_subtype_of(Klass* k);
1006 bool can_be_primary_super_slow() const;
1007 int oop_size(oop obj) const { return size_helper(); }
1008 // slow because it's a virtual call and used for verifying the layout_helper.
1009 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1010 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1011
1012 // Iterators
1013 void do_local_static_fields(FieldClosure* cl);
1014 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1015 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1016
1017 void methods_do(void f(Method* method));
1018 void array_klasses_do(void f(Klass* k));
1019 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1020 bool super_types_do(SuperTypeClosure* blk);
1021
1022 static InstanceKlass* cast(Klass* k) {
1023 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1024 }
1025
1026 static const InstanceKlass* cast(const Klass* k) {
1027 assert(k != NULL, "k should not be null");
1028 assert(k->is_instance_klass(), "cast to InstanceKlass");
1029 return static_cast<const InstanceKlass*>(k);
1030 }
1031
1032 InstanceKlass* java_super() const {
1033 return (super() == NULL) ? NULL : cast(super());
1034 }
1035
1036 // Sizing (in words)
1037 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1038
1039 static int size(int vtable_length, int itable_length,
1040 int nonstatic_oop_map_size,
1041 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) {
1042 return align_metadata_size(header_size() +
1043 vtable_length +
1044 itable_length +
1045 nonstatic_oop_map_size +
1046 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1047 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1048 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1049 }
1050 int size() const { return size(vtable_length(),
1051 itable_length(),
1052 nonstatic_oop_map_size(),
1053 is_interface(),
1054 is_anonymous(),
1055 has_stored_fingerprint());
1056 }
1057 #if INCLUDE_SERVICES
1058 virtual void collect_statistics(KlassSizeStats *sz) const;
1059 #endif
1060
1061 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1062 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1063
1064 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1065
1066 address static_field_addr(int offset);
1067
1068 OopMapBlock* start_of_nonstatic_oop_maps() const {
1069 return (OopMapBlock*)(start_of_itable() + itable_length());
1070 }
1071
1072 Klass** end_of_nonstatic_oop_maps() const {
1073 return (Klass**)(start_of_nonstatic_oop_maps() +
1074 nonstatic_oop_map_count());
1075 }
1076
1077 Klass** adr_implementor() const {
1078 if (is_interface()) {
1079 return (Klass**)end_of_nonstatic_oop_maps();
1080 } else {
1081 return NULL;
1082 }
1083 };
1084
1085 InstanceKlass** adr_host_klass() const {
1086 if (is_anonymous()) {
1087 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1088 if (adr_impl != NULL) {
1089 return adr_impl + 1;
1090 } else {
1091 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1092 }
1093 } else {
1094 return NULL;
1095 }
1096 }
1097
1098 address adr_fingerprint() const {
1099 if (has_stored_fingerprint()) {
1100 InstanceKlass** adr_host = adr_host_klass();
1101 if (adr_host != NULL) {
1102 return (address)(adr_host + 1);
1103 }
1104
1105 Klass** adr_impl = adr_implementor();
1106 if (adr_impl != NULL) {
1107 return (address)(adr_impl + 1);
1108 }
1109
1110 return (address)end_of_nonstatic_oop_maps();
1111 } else {
1112 return NULL;
1113 }
1114 }
1115
1116 // Use this to return the size of an instance in heap words:
1117 int size_helper() const {
1118 return layout_helper_to_size_helper(layout_helper());
1119 }
1120
1121 // This bit is initialized in classFileParser.cpp.
1122 // It is false under any of the following conditions:
1123 // - the class is abstract (including any interface)
1124 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1125 // - the class size is larger than FastAllocateSizeLimit
1126 // - the class is java/lang/Class, which cannot be allocated directly
1127 bool can_be_fastpath_allocated() const {
1128 return !layout_helper_needs_slow_path(layout_helper());
1129 }
1130
1131 // Java itable
1132 klassItable itable() const; // return klassItable wrapper
1133 Method* method_at_itable(Klass* holder, int index, TRAPS);
1134
1135 #if INCLUDE_JVMTI
1136 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1137 #endif // INCLUDE_JVMTI
1138
1139 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1140 void clean_implementors_list(BoolObjectClosure* is_alive);
1141 void clean_method_data(BoolObjectClosure* is_alive);
1142
1143 // Explicit metaspace deallocation of fields
1144 // For RedefineClasses and class file parsing errors, we need to deallocate
1145 // instanceKlasses and the metadata they point to.
1146 void deallocate_contents(ClassLoaderData* loader_data);
1147 static void deallocate_methods(ClassLoaderData* loader_data,
1148 Array<Method*>* methods);
1149 void static deallocate_interfaces(ClassLoaderData* loader_data,
1150 const Klass* super_klass,
1151 Array<Klass*>* local_interfaces,
1152 Array<Klass*>* transitive_interfaces);
1153
1154 // The constant pool is on stack if any of the methods are executing or
1155 // referenced by handles.
1156 bool on_stack() const { return _constants->on_stack(); }
1157
1158 // callbacks for actions during class unloading
1159 static void notify_unload_class(InstanceKlass* ik);
1160 static void release_C_heap_structures(InstanceKlass* ik);
1161
1162 // Naming
1163 const char* signature_name() const;
1164 static Symbol* package_from_name(const Symbol* name, TRAPS);
1165
1166 // GC specific object visitors
1167 //
1168 #if INCLUDE_ALL_GCS
1169 // Parallel Scavenge
1170 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1171 // Parallel Compact
1172 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1173 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1174 #endif
1175
1176 // Oop fields (and metadata) iterators
1177 // [nv = true] Use non-virtual calls to do_oop_nv.
1178 // [nv = false] Use virtual calls to do_oop.
1179 //
1180 // The InstanceKlass iterators also visits the Object's klass.
1181
1182 // Forward iteration
1183 public:
1184 // Iterate over all oop fields in the oop maps.
1185 template <bool nv, class OopClosureType>
1186 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1187
1188 protected:
1189 // Iterate over all oop fields and metadata.
1190 template <bool nv, class OopClosureType>
1191 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1192
1193 private:
1194 // Iterate over all oop fields in the oop maps.
1195 // Specialized for [T = oop] or [T = narrowOop].
1196 template <bool nv, typename T, class OopClosureType>
1197 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1198
1199 // Iterate over all oop fields in one oop map.
1200 template <bool nv, typename T, class OopClosureType>
1201 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1202
1203
1204 // Reverse iteration
1205 #if INCLUDE_ALL_GCS
1206 public:
1207 // Iterate over all oop fields in the oop maps.
1208 template <bool nv, class OopClosureType>
1209 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1210
1211 protected:
1212 // Iterate over all oop fields and metadata.
1213 template <bool nv, class OopClosureType>
1214 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1215
1216 private:
1217 // Iterate over all oop fields in the oop maps.
1218 // Specialized for [T = oop] or [T = narrowOop].
1219 template <bool nv, typename T, class OopClosureType>
1220 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1221
1222 // Iterate over all oop fields in one oop map.
1223 template <bool nv, typename T, class OopClosureType>
1224 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1225 #endif
1226
1227
1228 // Bounded range iteration
1229 public:
1230 // Iterate over all oop fields in the oop maps.
1231 template <bool nv, class OopClosureType>
1232 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1233
1234 protected:
1235 // Iterate over all oop fields and metadata.
1236 template <bool nv, class OopClosureType>
1237 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1238
1239 private:
1240 // Iterate over all oop fields in the oop maps.
1241 // Specialized for [T = oop] or [T = narrowOop].
1242 template <bool nv, typename T, class OopClosureType>
1243 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1244
1245 // Iterate over all oop fields in one oop map.
1246 template <bool nv, typename T, class OopClosureType>
1247 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1248
1249
1250 public:
1251
1252 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1253 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1254
1255 #if INCLUDE_ALL_GCS
1256 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1257 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1258 #endif // INCLUDE_ALL_GCS
1259
1260 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1261
1262 public:
1263 void set_in_error_state() {
1264 assert(DumpSharedSpaces, "only call this when dumping archive");
1265 _init_state = initialization_error;
1266 }
1267 bool check_sharing_error_state();
1268
1269 private:
1270 // initialization state
1271 #ifdef ASSERT
1272 void set_init_state(ClassState state);
1273 #else
1274 void set_init_state(ClassState state) { _init_state = (u1)state; }
1275 #endif
1276 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1277 void set_init_thread(Thread *thread) { _init_thread = thread; }
1278
1279 // The RedefineClasses() API can cause new method idnums to be needed
1280 // which will cause the caches to grow. Safety requires different
1281 // cache management logic if the caches can grow instead of just
1282 // going from NULL to non-NULL.
1283 bool idnum_can_increment() const { return has_been_redefined(); }
1284 inline jmethodID* methods_jmethod_ids_acquire() const;
1285 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1286
1287 // Lock during initialization
1288 public:
1289 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1290 // Must be one per class and it has to be a VM internal object so java code
1291 // cannot lock it (like the mirror).
1292 // It has to be an object not a Mutex because it's held through java calls.
1293 oop init_lock() const;
1294 private:
1295 void fence_and_clear_init_lock();
1296
1297 bool link_class_impl (bool throw_verifyerror, TRAPS);
1298 bool verify_code (bool throw_verifyerror, TRAPS);
1299 void initialize_impl (TRAPS);
1300 void initialize_super_interfaces (TRAPS);
1301 void eager_initialize_impl ();
1302 /* jni_id_for_impl for jfieldID only */
1303 JNIid* jni_id_for_impl (int offset);
1304
1305 // Returns the array class for the n'th dimension
1306 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1307
1308 // Returns the array class with this class as element type
1309 Klass* array_klass_impl(bool or_null, TRAPS);
1310
1311 // find a local method (returns NULL if not found)
1312 Method* find_method_impl(const Symbol* name,
1313 const Symbol* signature,
1314 OverpassLookupMode overpass_mode,
1315 StaticLookupMode static_mode,
1316 PrivateLookupMode private_mode) const;
1317
1318 static Method* find_method_impl(const Array<Method*>* methods,
1319 const Symbol* name,
1320 const Symbol* signature,
1321 OverpassLookupMode overpass_mode,
1322 StaticLookupMode static_mode,
1323 PrivateLookupMode private_mode);
1324
1325 // Free CHeap allocated fields.
1326 void release_C_heap_structures();
1327
1328 #if INCLUDE_JVMTI
1329 // RedefineClasses support
1330 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1331 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1332 #endif
1333 public:
1334 // CDS support - remove and restore oops from metadata. Oops are not shared.
1335 virtual void remove_unshareable_info();
1336 virtual void remove_java_mirror();
1337 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1338
1339 // jvm support
1340 jint compute_modifier_flags(TRAPS) const;
1341
1342 public:
1343 // JVMTI support
1344 jint jvmti_class_status() const;
1345
1346 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1347
1348 public:
1349 // Printing
1350 #ifndef PRODUCT
1351 void print_on(outputStream* st) const;
1352 #endif
1353 void print_value_on(outputStream* st) const;
1354
1355 void oop_print_value_on(oop obj, outputStream* st);
1356
1357 #ifndef PRODUCT
1358 void oop_print_on (oop obj, outputStream* st);
1359
1360 void print_dependent_nmethods(bool verbose = false);
1361 bool is_dependent_nmethod(nmethod* nm);
1362 #endif
1363
1364 const char* internal_name() const;
1365
1366 // Verification
1367 void verify_on(outputStream* st);
1368
1369 void oop_verify_on(oop obj, outputStream* st);
1370
1371 // Logging
1372 void print_class_load_logging(ClassLoaderData* loader_data,
1373 const char* module_name,
1374 const ClassFileStream* cfs) const;
1375 };
1376
1377 // for adding methods
1378 // UNSET_IDNUM return means no more ids available
1379 inline u2 InstanceKlass::next_method_idnum() {
1380 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1381 return ConstMethod::UNSET_IDNUM; // no more ids available
1382 } else {
1383 return _idnum_allocated_count++;
1384 }
1385 }
1386
1387
1388 /* JNIid class for jfieldIDs only */
1389 class JNIid: public CHeapObj<mtClass> {
1390 friend class VMStructs;
1391 private:
1392 Klass* _holder;
1393 JNIid* _next;
1394 int _offset;
1395 #ifdef ASSERT
1396 bool _is_static_field_id;
1397 #endif
1398
1399 public:
1400 // Accessors
1401 Klass* holder() const { return _holder; }
1402 int offset() const { return _offset; }
1403 JNIid* next() { return _next; }
1404 // Constructor
1405 JNIid(Klass* holder, int offset, JNIid* next);
1406 // Identifier lookup
1407 JNIid* find(int offset);
1408
1409 bool find_local_field(fieldDescriptor* fd) {
1410 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1411 }
1412
1413 static void deallocate(JNIid* id);
1414 // Debugging
1415 #ifdef ASSERT
1416 bool is_static_field_id() const { return _is_static_field_id; }
1417 void set_is_static_field_id() { _is_static_field_id = true; }
1418 #endif
1419 void verify(Klass* holder);
1420 };
1421
1422 // An iterator that's used to access the inner classes indices in the
1423 // InstanceKlass::_inner_classes array.
1424 class InnerClassesIterator : public StackObj {
1425 private:
1426 Array<jushort>* _inner_classes;
1427 int _length;
1428 int _idx;
1429 public:
1430
1431 InnerClassesIterator(const InstanceKlass* k) {
1432 _inner_classes = k->inner_classes();
1433 if (k->inner_classes() != NULL) {
1434 _length = _inner_classes->length();
1435 // The inner class array's length should be the multiple of
1436 // inner_class_next_offset if it only contains the InnerClasses
1437 // attribute data, or it should be
1438 // n*inner_class_next_offset+enclosing_method_attribute_size
1439 // if it also contains the EnclosingMethod data.
1440 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1441 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1442 "just checking");
1443 // Remove the enclosing_method portion if exists.
1444 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1445 _length -= InstanceKlass::enclosing_method_attribute_size;
1446 }
1447 } else {
1448 _length = 0;
1449 }
1450 _idx = 0;
1451 }
1452
1453 int length() const {
1454 return _length;
1455 }
1456
1457 void next() {
1458 _idx += InstanceKlass::inner_class_next_offset;
1459 }
1460
1461 bool done() const {
1462 return (_idx >= _length);
1463 }
1464
1465 u2 inner_class_info_index() const {
1466 return _inner_classes->at(
1467 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1468 }
1469
1470 void set_inner_class_info_index(u2 index) {
1471 _inner_classes->at_put(
1472 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1473 }
1474
1475 u2 outer_class_info_index() const {
1476 return _inner_classes->at(
1477 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1478 }
1479
1480 void set_outer_class_info_index(u2 index) {
1481 _inner_classes->at_put(
1482 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1483 }
1484
1485 u2 inner_name_index() const {
1486 return _inner_classes->at(
1487 _idx + InstanceKlass::inner_class_inner_name_offset);
1488 }
1489
1490 void set_inner_name_index(u2 index) {
1491 _inner_classes->at_put(
1492 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1493 }
1494
1495 u2 inner_access_flags() const {
1496 return _inner_classes->at(
1497 _idx + InstanceKlass::inner_class_access_flags_offset);
1498 }
1499 };
1500
1501 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP