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