1 /*
2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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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 private:
139 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
140
141 protected:
142 // If you add a new field that points to any metaspace object, you
143 // must add this field to InstanceKlass::metaspace_pointers_do().
144
145 // Annotations for this class
146 Annotations* _annotations;
147 // Package this class is defined in
148 PackageEntry* _package_entry;
149 // Array classes holding elements of this class.
150 Klass* volatile _array_klasses;
151 // Constant pool for this class.
152 ConstantPool* _constants;
153 // The InnerClasses attribute and EnclosingMethod attribute. The
154 // _inner_classes is an array of shorts. If the class has InnerClasses
155 // attribute, then the _inner_classes array begins with 4-tuples of shorts
156 // [inner_class_info_index, outer_class_info_index,
157 // inner_name_index, inner_class_access_flags] for the InnerClasses
158 // attribute. If the EnclosingMethod attribute exists, it occupies the
159 // last two shorts [class_index, method_index] of the array. If only
160 // the InnerClasses attribute exists, the _inner_classes array length is
161 // number_of_inner_classes * 4. If the class has both InnerClasses
162 // and EnclosingMethod attributes the _inner_classes array length is
163 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
164 Array<jushort>* _inner_classes;
165
166 // the source debug extension for this klass, NULL if not specified.
167 // Specified as UTF-8 string without terminating zero byte in the classfile,
168 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
169 const char* _source_debug_extension;
170 // Array name derived from this class which needs unreferencing
171 // if this class is unloaded.
172 Symbol* _array_name;
173
174 // Number of heapOopSize words used by non-static fields in this klass
175 // (including inherited fields but after header_size()).
176 int _nonstatic_field_size;
177 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
178 // Constant pool index to the utf8 entry of the Generic signature,
179 // or 0 if none.
180 u2 _generic_signature_index;
181 // Constant pool index to the utf8 entry for the name of source file
182 // containing this klass, 0 if not specified.
183 u2 _source_file_name_index;
184 u2 _static_oop_field_count;// number of static oop fields in this klass
185 u2 _java_fields_count; // The number of declared Java fields
186 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
187
188 int _itable_len; // length of Java itable (in words)
189 // _is_marked_dependent can be set concurrently, thus cannot be part of the
190 // _misc_flags.
191 bool _is_marked_dependent; // used for marking during flushing and deoptimization
192 bool _is_being_redefined; // used for locking redefinition
193
194 // The low two bits of _misc_flags contains the kind field.
195 // This can be used to quickly discriminate among the four kinds of
196 // InstanceKlass.
197
198 static const unsigned _misc_kind_field_size = 2;
199 static const unsigned _misc_kind_field_pos = 0;
200 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
201
202 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
203 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
204 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
205 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
206
207 // Start after _misc_kind field.
208 enum {
209 _misc_rewritten = 1 << 2, // methods rewritten.
210 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
211 _misc_should_verify_class = 1 << 4, // allow caching of preverification
212 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
213 _misc_is_contended = 1 << 6, // marked with contended annotation
214 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
215 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
216 _misc_has_been_redefined = 1 << 9, // class has been redefined
217 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
218 // code source was found to be matching the value recorded by AOT.
219 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
220 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
221 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
222 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
223 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
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 JNIid* _jni_ids; // First JNI identifier for static fields in this class
234 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
235 intptr_t _dep_context; // packed DependencyContext structure
236 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
237 #if INCLUDE_JVMTI
238 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
239 // Linked instanceKlasses of previous versions
240 InstanceKlass* _previous_versions;
241 // JVMTI fields can be moved to their own structure - see 6315920
242 // JVMTI: cached class file, before retransformable agent modified it in CFLH
243 JvmtiCachedClassFileData* _cached_class_file;
244 #endif
245
246 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
247
248 // Class states are defined as ClassState (see above).
249 // Place the _init_state here to utilize the unused 2-byte after
250 // _idnum_allocated_count.
251 u1 _init_state; // state of class
252 u1 _reference_type; // reference type
253
254 #if INCLUDE_JVMTI
255 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
256 #endif
257
258 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
259
260 // Method array.
261 Array<Method*>* _methods;
262 // Default Method Array, concrete methods inherited from interfaces
263 Array<Method*>* _default_methods;
264 // Interface (Klass*s) this class declares locally to implement.
265 Array<Klass*>* _local_interfaces;
266 // Interface (Klass*s) this class implements transitively.
267 Array<Klass*>* _transitive_interfaces;
268 // Int array containing the original order of method in the class file (for JVMTI).
269 Array<int>* _method_ordering;
270 // Int array containing the vtable_indices for default_methods
271 // offset matches _default_methods offset
272 Array<int>* _default_vtable_indices;
273
274 // Instance and static variable information, starts with 6-tuples of shorts
275 // [access, name index, sig index, initval index, low_offset, high_offset]
276 // for all fields, followed by the generic signature data at the end of
277 // the array. Only fields with generic signature attributes have the generic
278 // signature data set in the array. The fields array looks like following:
279 //
280 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
281 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
282 // ...
283 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
284 // [generic signature index]
285 // [generic signature index]
286 // ...
287 Array<u2>* _fields;
288
289 // embedded Java vtable follows here
290 // embedded Java itables follows here
291 // embedded static fields follows here
292 // embedded nonstatic oop-map blocks follows here
293 // embedded implementor of this interface follows here
294 // The embedded implementor only exists if the current klass is an
295 // iterface. The possible values of the implementor fall into following
296 // three cases:
297 // NULL: no implementor.
298 // A Klass* that's not itself: one implementor.
299 // Itself: more than one implementors.
300 // embedded host klass follows here
301 // The embedded host klass only exists in an anonymous class for
302 // dynamic language support (JSR 292 enabled). The host class grants
303 // its access privileges to this class also. The host class is either
304 // named, or a previously loaded anonymous class. A non-anonymous class
305 // or an anonymous class loaded through normal classloading does not
306 // have this embedded field.
307 //
308
309 friend class SystemDictionary;
310
311 public:
312 u2 loader_type() {
313 return _misc_flags & loader_type_bits();
314 }
315
316 bool is_shared_boot_class() const {
317 return (_misc_flags & _misc_is_shared_boot_class) != 0;
318 }
319 bool is_shared_platform_class() const {
320 return (_misc_flags & _misc_is_shared_platform_class) != 0;
321 }
322 bool is_shared_app_class() const {
323 return (_misc_flags & _misc_is_shared_app_class) != 0;
324 }
325
326 void set_class_loader_type(s2 loader_type) {
327 switch (loader_type) {
328 case ClassLoader::BOOT_LOADER:
329 _misc_flags |= _misc_is_shared_boot_class;
330 break;
331 case ClassLoader::PLATFORM_LOADER:
332 _misc_flags |= _misc_is_shared_platform_class;
333 break;
334 case ClassLoader::APP_LOADER:
335 _misc_flags |= _misc_is_shared_app_class;
336 break;
337 default:
338 ShouldNotReachHere();
339 break;
340 }
341 }
342
343 bool has_nonstatic_fields() const {
344 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
345 }
346 void set_has_nonstatic_fields(bool b) {
347 if (b) {
348 _misc_flags |= _misc_has_nonstatic_fields;
349 } else {
350 _misc_flags &= ~_misc_has_nonstatic_fields;
351 }
352 }
353
354 // field sizes
355 int nonstatic_field_size() const { return _nonstatic_field_size; }
356 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
357
358 int static_field_size() const { return _static_field_size; }
359 void set_static_field_size(int size) { _static_field_size = size; }
360
361 int static_oop_field_count() const { return (int)_static_oop_field_count; }
362 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
363
364 // Java itable
365 int itable_length() const { return _itable_len; }
366 void set_itable_length(int len) { _itable_len = len; }
367
368 // array klasses
369 Klass* array_klasses() const { return _array_klasses; }
370 inline Klass* array_klasses_acquire() const; // load with acquire semantics
371 void set_array_klasses(Klass* k) { _array_klasses = k; }
372 inline void release_set_array_klasses(Klass* k); // store with release semantics
373
374 // methods
375 Array<Method*>* methods() const { return _methods; }
376 void set_methods(Array<Method*>* a) { _methods = a; }
377 Method* method_with_idnum(int idnum);
378 Method* method_with_orig_idnum(int idnum);
379 Method* method_with_orig_idnum(int idnum, int version);
380
381 // method ordering
382 Array<int>* method_ordering() const { return _method_ordering; }
383 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
384 void copy_method_ordering(const intArray* m, TRAPS);
385
386 // default_methods
387 Array<Method*>* default_methods() const { return _default_methods; }
388 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
389
390 // default method vtable_indices
391 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
392 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
393 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
394
395 // interfaces
396 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
397 void set_local_interfaces(Array<Klass*>* a) {
398 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
399 _local_interfaces = a; }
400
401 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
402 void set_transitive_interfaces(Array<Klass*>* a) {
403 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
404 _transitive_interfaces = a;
405 }
406
407 private:
408 friend class fieldDescriptor;
409 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
410
411 public:
412 int field_offset (int index) const { return field(index)->offset(); }
413 int field_access_flags(int index) const { return field(index)->access_flags(); }
414 Symbol* field_name (int index) const { return field(index)->name(constants()); }
415 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
416
417 // Number of Java declared fields
418 int java_fields_count() const { return (int)_java_fields_count; }
419
420 Array<u2>* fields() const { return _fields; }
421 void set_fields(Array<u2>* f, u2 java_fields_count) {
422 guarantee(_fields == NULL || f == NULL, "Just checking");
423 _fields = f;
424 _java_fields_count = java_fields_count;
425 }
426
427 // inner classes
428 Array<u2>* inner_classes() const { return _inner_classes; }
429 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
430
431 enum InnerClassAttributeOffset {
432 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
433 inner_class_inner_class_info_offset = 0,
434 inner_class_outer_class_info_offset = 1,
435 inner_class_inner_name_offset = 2,
436 inner_class_access_flags_offset = 3,
437 inner_class_next_offset = 4
438 };
439
440 enum EnclosingMethodAttributeOffset {
441 enclosing_method_class_index_offset = 0,
442 enclosing_method_method_index_offset = 1,
443 enclosing_method_attribute_size = 2
444 };
445
446 // method override check
447 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
448
449 // package
450 PackageEntry* package() const { return _package_entry; }
451 ModuleEntry* module() const;
452 bool in_unnamed_package() const { return (_package_entry == NULL); }
453 void set_package(PackageEntry* p) { _package_entry = p; }
454 void set_package(ClassLoaderData* loader_data, TRAPS);
455 bool is_same_class_package(const Klass* class2) const;
456 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
457
458 // find an enclosing class
459 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
460
461 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
462 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
463
464 private:
465 // Check prohibited package ("java/" only loadable by boot or platform loaders)
466 static void check_prohibited_package(Symbol* class_name,
467 Handle class_loader,
468 TRAPS);
469 public:
470 // tell if two classes have the same enclosing class (at package level)
471 bool is_same_package_member(const Klass* class2, TRAPS) const;
472
473 // initialization state
474 bool is_loaded() const { return _init_state >= loaded; }
475 bool is_linked() const { return _init_state >= linked; }
476 bool is_initialized() const { return _init_state == fully_initialized; }
477 bool is_not_initialized() const { return _init_state < being_initialized; }
478 bool is_being_initialized() const { return _init_state == being_initialized; }
479 bool is_in_error_state() const { return _init_state == initialization_error; }
480 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
481 ClassState init_state() { return (ClassState)_init_state; }
482 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
483
484 // defineClass specified verification
485 bool should_verify_class() const {
486 return (_misc_flags & _misc_should_verify_class) != 0;
487 }
488 void set_should_verify_class(bool value) {
489 if (value) {
490 _misc_flags |= _misc_should_verify_class;
491 } else {
492 _misc_flags &= ~_misc_should_verify_class;
493 }
494 }
495
496 // marking
497 bool is_marked_dependent() const { return _is_marked_dependent; }
498 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
499
500 // initialization (virtuals from Klass)
501 bool should_be_initialized() const; // means that initialize should be called
502 void initialize(TRAPS);
503 void link_class(TRAPS);
504 bool link_class_or_fail(TRAPS); // returns false on failure
505 void unlink_class();
506 void rewrite_class(TRAPS);
507 void link_methods(TRAPS);
508 Method* class_initializer() const;
509
510 // set the class to initialized if no static initializer is present
511 void eager_initialize(Thread *thread);
512
513 // reference type
514 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
515 void set_reference_type(ReferenceType t) {
516 assert(t == (u1)t, "overflow");
517 _reference_type = (u1)t;
518 }
519
520 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
521
522 // find local field, returns true if found
523 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
524 // find field in direct superinterfaces, returns the interface in which the field is defined
525 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
526 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
527 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
528 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
529 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
530
531 // find a non-static or static field given its offset within the class.
532 bool contains_field_offset(int offset) {
533 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
534 }
535
536 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
537 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
538
539 // find a local method (returns NULL if not found)
540 Method* find_method(const Symbol* name, const Symbol* signature) const;
541 static Method* find_method(const Array<Method*>* methods,
542 const Symbol* name,
543 const Symbol* signature);
544
545 // find a local method, but skip static methods
546 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
547 static Method* find_instance_method(const Array<Method*>* methods,
548 const Symbol* name,
549 const Symbol* signature);
550
551 // find a local method (returns NULL if not found)
552 Method* find_local_method(const Symbol* name,
553 const Symbol* signature,
554 OverpassLookupMode overpass_mode,
555 StaticLookupMode static_mode,
556 PrivateLookupMode private_mode) const;
557
558 // find a local method from given methods array (returns NULL if not found)
559 static Method* find_local_method(const Array<Method*>* methods,
560 const Symbol* name,
561 const Symbol* signature,
562 OverpassLookupMode overpass_mode,
563 StaticLookupMode static_mode,
564 PrivateLookupMode private_mode);
565
566 // find a local method index in methods or default_methods (returns -1 if not found)
567 static int find_method_index(const Array<Method*>* methods,
568 const Symbol* name,
569 const Symbol* signature,
570 OverpassLookupMode overpass_mode,
571 StaticLookupMode static_mode,
572 PrivateLookupMode private_mode);
573
574 // lookup operation (returns NULL if not found)
575 Method* uncached_lookup_method(const Symbol* name,
576 const Symbol* signature,
577 OverpassLookupMode overpass_mode) const;
578
579 // lookup a method in all the interfaces that this class implements
580 // (returns NULL if not found)
581 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
582
583 // lookup a method in local defaults then in all interfaces
584 // (returns NULL if not found)
585 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
586
587 // Find method indices by name. If a method with the specified name is
588 // found the index to the first method is returned, and 'end' is filled in
589 // with the index of first non-name-matching method. If no method is found
590 // -1 is returned.
591 int find_method_by_name(const Symbol* name, int* end) const;
592 static int find_method_by_name(const Array<Method*>* methods,
593 const Symbol* name, int* end);
594
595 // constant pool
596 ConstantPool* constants() const { return _constants; }
597 void set_constants(ConstantPool* c) { _constants = c; }
598
599 // protection domain
600 oop protection_domain() const;
601
602 // signers
603 objArrayOop signers() const;
604
605 // host class
606 InstanceKlass* host_klass() const {
607 InstanceKlass** hk = adr_host_klass();
608 if (hk == NULL) {
609 assert(!is_anonymous(), "Anonymous classes have host klasses");
610 return NULL;
611 } else {
612 assert(*hk != NULL, "host klass should always be set if the address is not null");
613 assert(is_anonymous(), "Only anonymous classes have host klasses");
614 return *hk;
615 }
616 }
617 void set_host_klass(const InstanceKlass* host) {
618 assert(is_anonymous(), "not anonymous");
619 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
620 assert(addr != NULL, "no reversed space");
621 if (addr != NULL) {
622 *addr = host;
623 }
624 }
625 bool has_host_klass() const {
626 return adr_host_klass() != NULL;
627 }
628 bool is_anonymous() const {
629 return (_misc_flags & _misc_is_anonymous) != 0;
630 }
631 void set_is_anonymous(bool value) {
632 if (value) {
633 _misc_flags |= _misc_is_anonymous;
634 } else {
635 _misc_flags &= ~_misc_is_anonymous;
636 }
637 }
638
639 // Oop that keeps the metadata for this class from being unloaded
640 // in places where the metadata is stored in other places, like nmethods
641 oop klass_holder() const {
642 return is_anonymous() ? java_mirror() : class_loader();
643 }
644
645 // Load the klass_holder as a phantom. This is useful when a weak Klass
646 // pointer has been "peeked" and then must be kept alive before it may
647 // be used safely.
648 oop klass_holder_phantom();
649
650 bool is_contended() const {
651 return (_misc_flags & _misc_is_contended) != 0;
652 }
653 void set_is_contended(bool value) {
654 if (value) {
655 _misc_flags |= _misc_is_contended;
656 } else {
657 _misc_flags &= ~_misc_is_contended;
658 }
659 }
660
661 // source file name
662 Symbol* source_file_name() const {
663 return (_source_file_name_index == 0) ?
664 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
665 }
666 u2 source_file_name_index() const {
667 return _source_file_name_index;
668 }
669 void set_source_file_name_index(u2 sourcefile_index) {
670 _source_file_name_index = sourcefile_index;
671 }
672
673 // minor and major version numbers of class file
674 u2 minor_version() const { return _minor_version; }
675 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
676 u2 major_version() const { return _major_version; }
677 void set_major_version(u2 major_version) { _major_version = major_version; }
678
679 // source debug extension
680 const char* source_debug_extension() const { return _source_debug_extension; }
681 void set_source_debug_extension(const char* array, int length);
682
683 // symbol unloading support (refcount already added)
684 Symbol* array_name() { return _array_name; }
685 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
686
687 // nonstatic oop-map blocks
688 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
689 return oop_map_count * OopMapBlock::size_in_words();
690 }
691 unsigned int nonstatic_oop_map_count() const {
692 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
693 }
694 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
695 void set_nonstatic_oop_map_size(int words) {
696 _nonstatic_oop_map_size = words;
697 }
698
699 #if INCLUDE_JVMTI
700 // Redefinition locking. Class can only be redefined by one thread at a time.
701 bool is_being_redefined() const { return _is_being_redefined; }
702 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
703
704 // RedefineClasses() support for previous versions:
705 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
706 void purge_previous_version_list();
707
708 InstanceKlass* previous_versions() const { return _previous_versions; }
709 #else
710 InstanceKlass* previous_versions() const { return NULL; }
711 #endif
712
713 InstanceKlass* get_klass_version(int version) {
714 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
715 if (ik->constants()->version() == version) {
716 return ik;
717 }
718 }
719 return NULL;
720 }
721
722 bool has_been_redefined() const {
723 return (_misc_flags & _misc_has_been_redefined) != 0;
724 }
725 void set_has_been_redefined() {
726 _misc_flags |= _misc_has_been_redefined;
727 }
728
729 bool has_passed_fingerprint_check() const {
730 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
731 }
732 void set_has_passed_fingerprint_check(bool b) {
733 if (b) {
734 _misc_flags |= _misc_has_passed_fingerprint_check;
735 } else {
736 _misc_flags &= ~_misc_has_passed_fingerprint_check;
737 }
738 }
739 bool supers_have_passed_fingerprint_checks();
740
741 static bool should_store_fingerprint(bool is_anonymous);
742 bool should_store_fingerprint() const { return should_store_fingerprint(is_anonymous()); }
743 bool has_stored_fingerprint() const;
744 uint64_t get_stored_fingerprint() const;
745 void store_fingerprint(uint64_t fingerprint);
746
747 bool is_scratch_class() const {
748 return (_misc_flags & _misc_is_scratch_class) != 0;
749 }
750
751 void set_is_scratch_class() {
752 _misc_flags |= _misc_is_scratch_class;
753 }
754
755 bool has_resolved_methods() const {
756 return (_misc_flags & _misc_has_resolved_methods) != 0;
757 }
758
759 void set_has_resolved_methods() {
760 _misc_flags |= _misc_has_resolved_methods;
761 }
762 private:
763
764 void set_kind(unsigned kind) {
765 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
766 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
767 unsigned flags = _misc_flags & ~fmask;
768 _misc_flags = (flags | (kind << _misc_kind_field_pos));
769 }
770
771 bool is_kind(unsigned desired) const {
772 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
773 return kind == desired;
774 }
775
776 public:
777
778 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
779 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
780 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
781 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
782 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
783
784 #if INCLUDE_JVMTI
785
786 void init_previous_versions() {
787 _previous_versions = NULL;
788 }
789
790 private:
791 static bool _has_previous_versions;
792 public:
793 static void purge_previous_versions(InstanceKlass* ik) {
794 if (ik->has_been_redefined()) {
795 ik->purge_previous_version_list();
796 }
797 }
798
799 static bool has_previous_versions_and_reset();
800
801 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
802 void set_cached_class_file(JvmtiCachedClassFileData *data) {
803 _cached_class_file = data;
804 }
805 JvmtiCachedClassFileData * get_cached_class_file();
806 jint get_cached_class_file_len();
807 unsigned char * get_cached_class_file_bytes();
808
809 // JVMTI: Support for caching of field indices, types, and offsets
810 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
811 _jvmti_cached_class_field_map = descriptor;
812 }
813 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
814 return _jvmti_cached_class_field_map;
815 }
816
817 #if INCLUDE_CDS
818 void set_archived_class_data(JvmtiCachedClassFileData* data) {
819 _cached_class_file = data;
820 }
821
822 JvmtiCachedClassFileData * get_archived_class_data();
823 #endif // INCLUDE_CDS
824 #else // INCLUDE_JVMTI
825
826 static void purge_previous_versions(InstanceKlass* ik) { return; };
827 static bool has_previous_versions_and_reset() { return false; }
828
829 void set_cached_class_file(JvmtiCachedClassFileData *data) {
830 assert(data == NULL, "unexpected call with JVMTI disabled");
831 }
832 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
833
834 #endif // INCLUDE_JVMTI
835
836 bool has_nonstatic_concrete_methods() const {
837 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
838 }
839 void set_has_nonstatic_concrete_methods(bool b) {
840 if (b) {
841 _misc_flags |= _misc_has_nonstatic_concrete_methods;
842 } else {
843 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
844 }
845 }
846
847 bool declares_nonstatic_concrete_methods() const {
848 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
849 }
850 void set_declares_nonstatic_concrete_methods(bool b) {
851 if (b) {
852 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
853 } else {
854 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
855 }
856 }
857
858 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
859 inline u2 next_method_idnum();
860 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
861
862 // generics support
863 Symbol* generic_signature() const {
864 return (_generic_signature_index == 0) ?
865 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
866 }
867 u2 generic_signature_index() const {
868 return _generic_signature_index;
869 }
870 void set_generic_signature_index(u2 sig_index) {
871 _generic_signature_index = sig_index;
872 }
873
874 u2 enclosing_method_data(int offset) const;
875 u2 enclosing_method_class_index() const {
876 return enclosing_method_data(enclosing_method_class_index_offset);
877 }
878 u2 enclosing_method_method_index() {
879 return enclosing_method_data(enclosing_method_method_index_offset);
880 }
881 void set_enclosing_method_indices(u2 class_index,
882 u2 method_index);
883
884 // jmethodID support
885 jmethodID get_jmethod_id(const methodHandle& method_h);
886 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
887 jmethodID new_id, jmethodID* new_jmeths,
888 jmethodID* to_dealloc_id_p,
889 jmethodID** to_dealloc_jmeths_p);
890 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
891 size_t *length_p, jmethodID* id_p);
892 void ensure_space_for_methodids(int start_offset = 0);
893 jmethodID jmethod_id_or_null(Method* method);
894
895 // annotations support
896 Annotations* annotations() const { return _annotations; }
897 void set_annotations(Annotations* anno) { _annotations = anno; }
898
899 AnnotationArray* class_annotations() const {
900 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
901 }
902 Array<AnnotationArray*>* fields_annotations() const {
903 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
904 }
905 AnnotationArray* class_type_annotations() const {
906 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
907 }
908 Array<AnnotationArray*>* fields_type_annotations() const {
909 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
910 }
911 // allocation
912 instanceOop allocate_instance(TRAPS);
913
914 // additional member function to return a handle
915 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
916
917 objArrayOop allocate_objArray(int n, int length, TRAPS);
918 // Helper function
919 static instanceOop register_finalizer(instanceOop i, TRAPS);
920
921 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
922 // if not, throw either an Error or an Exception.
923 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
924
925 // initialization
926 void call_class_initializer(TRAPS);
927 void set_initialization_state_and_notify(ClassState state, TRAPS);
928
929 // OopMapCache support
930 OopMapCache* oop_map_cache() { return _oop_map_cache; }
931 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
932 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
933
934 // JNI identifier support (for static fields - for jni performance)
935 JNIid* jni_ids() { return _jni_ids; }
936 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
937 JNIid* jni_id_for(int offset);
938
939 // maintenance of deoptimization dependencies
940 inline DependencyContext dependencies();
941 int mark_dependent_nmethods(KlassDepChange& changes);
942 void add_dependent_nmethod(nmethod* nm);
943 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
944
945 // On-stack replacement support
946 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
947 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
948 void add_osr_nmethod(nmethod* n);
949 bool remove_osr_nmethod(nmethod* n);
950 int mark_osr_nmethods(const Method* m);
951 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
952
953 #if INCLUDE_JVMTI
954 // Breakpoint support (see methods on Method* for details)
955 BreakpointInfo* breakpoints() const { return _breakpoints; };
956 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
957 #endif
958
959 // support for stub routines
960 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
961 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
962 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
963
964 // subclass/subinterface checks
965 bool implements_interface(Klass* k) const;
966 bool is_same_or_direct_interface(Klass* k) const;
967
968 #ifdef ASSERT
969 // check whether this class or one of its superclasses was redefined
970 bool has_redefined_this_or_super() const;
971 #endif
972
973 // Access to the implementor of an interface.
974 Klass* implementor() const
975 {
976 Klass** k = adr_implementor();
977 if (k == NULL) {
978 return NULL;
979 } else {
980 return *k;
981 }
982 }
983
984 void set_implementor(Klass* k) {
985 assert(is_interface(), "not interface");
986 Klass** addr = adr_implementor();
987 assert(addr != NULL, "null addr");
988 if (addr != NULL) {
989 *addr = k;
990 }
991 }
992
993 int nof_implementors() const {
994 Klass* k = implementor();
995 if (k == NULL) {
996 return 0;
997 } else if (k != this) {
998 return 1;
999 } else {
1000 return 2;
1001 }
1002 }
1003
1004 void add_implementor(Klass* k); // k is a new class that implements this interface
1005 void init_implementor(); // initialize
1006
1007 // link this class into the implementors list of every interface it implements
1008 void process_interfaces(Thread *thread);
1009
1010 // virtual operations from Klass
1011 bool is_leaf_class() const { return _subklass == NULL; }
1012 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1013 bool compute_is_subtype_of(Klass* k);
1014 bool can_be_primary_super_slow() const;
1015 int oop_size(oop obj) const { return size_helper(); }
1016 // slow because it's a virtual call and used for verifying the layout_helper.
1017 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1018 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1019
1020 // Iterators
1021 void do_local_static_fields(FieldClosure* cl);
1022 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1023 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1024
1025 void methods_do(void f(Method* method));
1026 void array_klasses_do(void f(Klass* k));
1027 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1028 bool super_types_do(SuperTypeClosure* blk);
1029
1030 static InstanceKlass* cast(Klass* k) {
1031 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1032 }
1033
1034 static const InstanceKlass* cast(const Klass* k) {
1035 assert(k != NULL, "k should not be null");
1036 assert(k->is_instance_klass(), "cast to InstanceKlass");
1037 return static_cast<const InstanceKlass*>(k);
1038 }
1039
1040 InstanceKlass* java_super() const {
1041 return (super() == NULL) ? NULL : cast(super());
1042 }
1043
1044 // Sizing (in words)
1045 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1046
1047 static int size(int vtable_length, int itable_length,
1048 int nonstatic_oop_map_size,
1049 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) {
1050 return align_metadata_size(header_size() +
1051 vtable_length +
1052 itable_length +
1053 nonstatic_oop_map_size +
1054 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1055 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1056 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1057 }
1058 int size() const { return size(vtable_length(),
1059 itable_length(),
1060 nonstatic_oop_map_size(),
1061 is_interface(),
1062 is_anonymous(),
1063 has_stored_fingerprint());
1064 }
1065 #if INCLUDE_SERVICES
1066 virtual void collect_statistics(KlassSizeStats *sz) const;
1067 #endif
1068
1069 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1070 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1071
1072 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1073
1074 address static_field_addr(int offset);
1075
1076 OopMapBlock* start_of_nonstatic_oop_maps() const {
1077 return (OopMapBlock*)(start_of_itable() + itable_length());
1078 }
1079
1080 Klass** end_of_nonstatic_oop_maps() const {
1081 return (Klass**)(start_of_nonstatic_oop_maps() +
1082 nonstatic_oop_map_count());
1083 }
1084
1085 Klass** adr_implementor() const {
1086 if (is_interface()) {
1087 return (Klass**)end_of_nonstatic_oop_maps();
1088 } else {
1089 return NULL;
1090 }
1091 };
1092
1093 InstanceKlass** adr_host_klass() const {
1094 if (is_anonymous()) {
1095 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1096 if (adr_impl != NULL) {
1097 return adr_impl + 1;
1098 } else {
1099 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1100 }
1101 } else {
1102 return NULL;
1103 }
1104 }
1105
1106 address adr_fingerprint() const {
1107 if (has_stored_fingerprint()) {
1108 InstanceKlass** adr_host = adr_host_klass();
1109 if (adr_host != NULL) {
1110 return (address)(adr_host + 1);
1111 }
1112
1113 Klass** adr_impl = adr_implementor();
1114 if (adr_impl != NULL) {
1115 return (address)(adr_impl + 1);
1116 }
1117
1118 return (address)end_of_nonstatic_oop_maps();
1119 } else {
1120 return NULL;
1121 }
1122 }
1123
1124 // Use this to return the size of an instance in heap words:
1125 int size_helper() const {
1126 return layout_helper_to_size_helper(layout_helper());
1127 }
1128
1129 // This bit is initialized in classFileParser.cpp.
1130 // It is false under any of the following conditions:
1131 // - the class is abstract (including any interface)
1132 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1133 // - the class size is larger than FastAllocateSizeLimit
1134 // - the class is java/lang/Class, which cannot be allocated directly
1135 bool can_be_fastpath_allocated() const {
1136 return !layout_helper_needs_slow_path(layout_helper());
1137 }
1138
1139 // Java itable
1140 klassItable itable() const; // return klassItable wrapper
1141 Method* method_at_itable(Klass* holder, int index, TRAPS);
1142
1143 #if INCLUDE_JVMTI
1144 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1145 #endif // INCLUDE_JVMTI
1146
1147 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1148 void clean_implementors_list(BoolObjectClosure* is_alive);
1149 void clean_method_data(BoolObjectClosure* is_alive);
1150
1151 // Explicit metaspace deallocation of fields
1152 // For RedefineClasses and class file parsing errors, we need to deallocate
1153 // instanceKlasses and the metadata they point to.
1154 void deallocate_contents(ClassLoaderData* loader_data);
1155 static void deallocate_methods(ClassLoaderData* loader_data,
1156 Array<Method*>* methods);
1157 void static deallocate_interfaces(ClassLoaderData* loader_data,
1158 const Klass* super_klass,
1159 Array<Klass*>* local_interfaces,
1160 Array<Klass*>* transitive_interfaces);
1161
1162 // The constant pool is on stack if any of the methods are executing or
1163 // referenced by handles.
1164 bool on_stack() const { return _constants->on_stack(); }
1165
1166 // callbacks for actions during class unloading
1167 static void notify_unload_class(InstanceKlass* ik);
1168 static void release_C_heap_structures(InstanceKlass* ik);
1169
1170 // Naming
1171 const char* signature_name() const;
1172 static Symbol* package_from_name(const Symbol* name, TRAPS);
1173
1174 // GC specific object visitors
1175 //
1176 #if INCLUDE_ALL_GCS
1177 // Parallel Scavenge
1178 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1179 // Parallel Compact
1180 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1181 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1182 #endif
1183
1184 // Oop fields (and metadata) iterators
1185 // [nv = true] Use non-virtual calls to do_oop_nv.
1186 // [nv = false] Use virtual calls to do_oop.
1187 //
1188 // The InstanceKlass iterators also visits the Object's klass.
1189
1190 // Forward iteration
1191 public:
1192 // Iterate over all oop fields in the oop maps.
1193 template <bool nv, class OopClosureType>
1194 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1195
1196 protected:
1197 // Iterate over all oop fields and metadata.
1198 template <bool nv, class OopClosureType>
1199 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1200
1201 private:
1202 // Iterate over all oop fields in the oop maps.
1203 // Specialized for [T = oop] or [T = narrowOop].
1204 template <bool nv, typename T, class OopClosureType>
1205 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1206
1207 // Iterate over all oop fields in one oop map.
1208 template <bool nv, typename T, class OopClosureType>
1209 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1210
1211
1212 // Reverse iteration
1213 #if INCLUDE_ALL_GCS
1214 public:
1215 // Iterate over all oop fields in the oop maps.
1216 template <bool nv, class OopClosureType>
1217 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1218
1219 protected:
1220 // Iterate over all oop fields and metadata.
1221 template <bool nv, class OopClosureType>
1222 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1223
1224 private:
1225 // Iterate over all oop fields in the oop maps.
1226 // Specialized for [T = oop] or [T = narrowOop].
1227 template <bool nv, typename T, class OopClosureType>
1228 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1229
1230 // Iterate over all oop fields in one oop map.
1231 template <bool nv, typename T, class OopClosureType>
1232 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1233 #endif
1234
1235
1236 // Bounded range iteration
1237 public:
1238 // Iterate over all oop fields in the oop maps.
1239 template <bool nv, class OopClosureType>
1240 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1241
1242 protected:
1243 // Iterate over all oop fields and metadata.
1244 template <bool nv, class OopClosureType>
1245 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1246
1247 private:
1248 // Iterate over all oop fields in the oop maps.
1249 // Specialized for [T = oop] or [T = narrowOop].
1250 template <bool nv, typename T, class OopClosureType>
1251 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1252
1253 // Iterate over all oop fields in one oop map.
1254 template <bool nv, typename T, class OopClosureType>
1255 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1256
1257
1258 public:
1259
1260 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1261 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1262
1263 #if INCLUDE_ALL_GCS
1264 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1265 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1266 #endif // INCLUDE_ALL_GCS
1267
1268 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1269
1270 public:
1271 void set_in_error_state() {
1272 assert(DumpSharedSpaces, "only call this when dumping archive");
1273 _init_state = initialization_error;
1274 }
1275 bool check_sharing_error_state();
1276
1277 private:
1278 // initialization state
1279 #ifdef ASSERT
1280 void set_init_state(ClassState state);
1281 #else
1282 void set_init_state(ClassState state) { _init_state = (u1)state; }
1283 #endif
1284 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1285 void set_init_thread(Thread *thread) { _init_thread = thread; }
1286
1287 // The RedefineClasses() API can cause new method idnums to be needed
1288 // which will cause the caches to grow. Safety requires different
1289 // cache management logic if the caches can grow instead of just
1290 // going from NULL to non-NULL.
1291 bool idnum_can_increment() const { return has_been_redefined(); }
1292 inline jmethodID* methods_jmethod_ids_acquire() const;
1293 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1294
1295 // Lock during initialization
1296 public:
1297 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1298 // Must be one per class and it has to be a VM internal object so java code
1299 // cannot lock it (like the mirror).
1300 // It has to be an object not a Mutex because it's held through java calls.
1301 oop init_lock() const;
1302 private:
1303 void fence_and_clear_init_lock();
1304
1305 bool link_class_impl (bool throw_verifyerror, TRAPS);
1306 bool verify_code (bool throw_verifyerror, TRAPS);
1307 void initialize_impl (TRAPS);
1308 void initialize_super_interfaces (TRAPS);
1309 void eager_initialize_impl ();
1310 /* jni_id_for_impl for jfieldID only */
1311 JNIid* jni_id_for_impl (int offset);
1312
1313 // Returns the array class for the n'th dimension
1314 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1315
1316 // Returns the array class with this class as element type
1317 Klass* array_klass_impl(bool or_null, TRAPS);
1318
1319 // find a local method (returns NULL if not found)
1320 Method* find_method_impl(const Symbol* name,
1321 const Symbol* signature,
1322 OverpassLookupMode overpass_mode,
1323 StaticLookupMode static_mode,
1324 PrivateLookupMode private_mode) const;
1325
1326 static Method* find_method_impl(const Array<Method*>* methods,
1327 const Symbol* name,
1328 const Symbol* signature,
1329 OverpassLookupMode overpass_mode,
1330 StaticLookupMode static_mode,
1331 PrivateLookupMode private_mode);
1332
1333 // Free CHeap allocated fields.
1334 void release_C_heap_structures();
1335
1336 #if INCLUDE_JVMTI
1337 // RedefineClasses support
1338 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1339 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1340 #endif
1341 public:
1342 // CDS support - remove and restore oops from metadata. Oops are not shared.
1343 virtual void remove_unshareable_info();
1344 virtual void remove_java_mirror();
1345 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1346
1347 // jvm support
1348 jint compute_modifier_flags(TRAPS) const;
1349
1350 public:
1351 // JVMTI support
1352 jint jvmti_class_status() const;
1353
1354 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1355
1356 public:
1357 // Printing
1358 #ifndef PRODUCT
1359 void print_on(outputStream* st) const;
1360 #endif
1361 void print_value_on(outputStream* st) const;
1362
1363 void oop_print_value_on(oop obj, outputStream* st);
1364
1365 #ifndef PRODUCT
1366 void oop_print_on (oop obj, outputStream* st);
1367
1368 void print_dependent_nmethods(bool verbose = false);
1369 bool is_dependent_nmethod(nmethod* nm);
1370 #endif
1371
1372 const char* internal_name() const;
1373
1374 // Verification
1375 void verify_on(outputStream* st);
1376
1377 void oop_verify_on(oop obj, outputStream* st);
1378
1379 // Logging
1380 void print_class_load_logging(ClassLoaderData* loader_data,
1381 const char* module_name,
1382 const ClassFileStream* cfs) const;
1383 };
1384
1385 // for adding methods
1386 // UNSET_IDNUM return means no more ids available
1387 inline u2 InstanceKlass::next_method_idnum() {
1388 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1389 return ConstMethod::UNSET_IDNUM; // no more ids available
1390 } else {
1391 return _idnum_allocated_count++;
1392 }
1393 }
1394
1395
1396 /* JNIid class for jfieldIDs only */
1397 class JNIid: public CHeapObj<mtClass> {
1398 friend class VMStructs;
1399 private:
1400 Klass* _holder;
1401 JNIid* _next;
1402 int _offset;
1403 #ifdef ASSERT
1404 bool _is_static_field_id;
1405 #endif
1406
1407 public:
1408 // Accessors
1409 Klass* holder() const { return _holder; }
1410 int offset() const { return _offset; }
1411 JNIid* next() { return _next; }
1412 // Constructor
1413 JNIid(Klass* holder, int offset, JNIid* next);
1414 // Identifier lookup
1415 JNIid* find(int offset);
1416
1417 bool find_local_field(fieldDescriptor* fd) {
1418 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1419 }
1420
1421 static void deallocate(JNIid* id);
1422 // Debugging
1423 #ifdef ASSERT
1424 bool is_static_field_id() const { return _is_static_field_id; }
1425 void set_is_static_field_id() { _is_static_field_id = true; }
1426 #endif
1427 void verify(Klass* holder);
1428 };
1429
1430 // An iterator that's used to access the inner classes indices in the
1431 // InstanceKlass::_inner_classes array.
1432 class InnerClassesIterator : public StackObj {
1433 private:
1434 Array<jushort>* _inner_classes;
1435 int _length;
1436 int _idx;
1437 public:
1438
1439 InnerClassesIterator(const InstanceKlass* k) {
1440 _inner_classes = k->inner_classes();
1441 if (k->inner_classes() != NULL) {
1442 _length = _inner_classes->length();
1443 // The inner class array's length should be the multiple of
1444 // inner_class_next_offset if it only contains the InnerClasses
1445 // attribute data, or it should be
1446 // n*inner_class_next_offset+enclosing_method_attribute_size
1447 // if it also contains the EnclosingMethod data.
1448 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1449 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1450 "just checking");
1451 // Remove the enclosing_method portion if exists.
1452 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1453 _length -= InstanceKlass::enclosing_method_attribute_size;
1454 }
1455 } else {
1456 _length = 0;
1457 }
1458 _idx = 0;
1459 }
1460
1461 int length() const {
1462 return _length;
1463 }
1464
1465 void next() {
1466 _idx += InstanceKlass::inner_class_next_offset;
1467 }
1468
1469 bool done() const {
1470 return (_idx >= _length);
1471 }
1472
1473 u2 inner_class_info_index() const {
1474 return _inner_classes->at(
1475 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1476 }
1477
1478 void set_inner_class_info_index(u2 index) {
1479 _inner_classes->at_put(
1480 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1481 }
1482
1483 u2 outer_class_info_index() const {
1484 return _inner_classes->at(
1485 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1486 }
1487
1488 void set_outer_class_info_index(u2 index) {
1489 _inner_classes->at_put(
1490 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1491 }
1492
1493 u2 inner_name_index() const {
1494 return _inner_classes->at(
1495 _idx + InstanceKlass::inner_class_inner_name_offset);
1496 }
1497
1498 void set_inner_name_index(u2 index) {
1499 _inner_classes->at_put(
1500 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1501 }
1502
1503 u2 inner_access_flags() const {
1504 return _inner_classes->at(
1505 _idx + InstanceKlass::inner_class_access_flags_offset);
1506 }
1507 };
1508
1509 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP