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 "logging/logLevel.hpp"
34 #include "memory/referenceType.hpp"
35 #include "oops/annotations.hpp"
36 #include "oops/constMethod.hpp"
37 #include "oops/fieldInfo.hpp"
38 #include "oops/instanceOop.hpp"
39 #include "oops/klassVtable.hpp"
40 #include "runtime/handles.hpp"
41 #include "runtime/os.hpp"
42 #include "trace/traceMacros.hpp"
43 #include "utilities/accessFlags.hpp"
44 #include "utilities/bitMap.inline.hpp"
45 #include "utilities/macros.hpp"
46
47 // An InstanceKlass is the VM level representation of a Java class.
48 // It contains all information needed for at class at execution runtime.
49
50 // InstanceKlass embedded field layout (after declared fields):
51 // [EMBEDDED Java vtable ] size in words = vtable_len
52 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
53 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
54 // indicating where oops are located in instances of this klass.
55 // [EMBEDDED implementor of the interface] only exist for interface
56 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
57 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
58
59
60 // forward declaration for class -- see below for definition
61 #if INCLUDE_JVMTI
62 class BreakpointInfo;
63 #endif
64 class ClassFileParser;
65 class KlassDepChange;
66 class DependencyContext;
67 class fieldDescriptor;
68 class jniIdMapBase;
69 class JNIid;
70 class JvmtiCachedClassFieldMap;
71 class MemberNameTable;
72 class SuperTypeClosure;
73
74 // This is used in iterators below.
75 class FieldClosure: public StackObj {
76 public:
77 virtual void do_field(fieldDescriptor* fd) = 0;
78 };
79
80 #ifndef PRODUCT
81 // Print fields.
82 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
83 class FieldPrinter: public FieldClosure {
84 oop _obj;
85 outputStream* _st;
86 public:
87 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
88 void do_field(fieldDescriptor* fd);
89 };
90 #endif // !PRODUCT
91
92 // ValueObjs embedded in klass. Describes where oops are located in instances of
93 // this klass.
94 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
95 public:
96 // Byte offset of the first oop mapped by this block.
97 int offset() const { return _offset; }
98 void set_offset(int offset) { _offset = offset; }
99
100 // Number of oops in this block.
101 uint count() const { return _count; }
102 void set_count(uint count) { _count = count; }
103
104 // sizeof(OopMapBlock) in words.
105 static const int size_in_words() {
106 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >>
107 LogBytesPerWord;
108 }
109
110 private:
111 int _offset;
112 uint _count;
113 };
114
115 struct JvmtiCachedClassFileData;
116
117 class InstanceKlass: public Klass {
118 friend class VMStructs;
119 friend class JVMCIVMStructs;
120 friend class ClassFileParser;
121 friend class CompileReplay;
122
123 protected:
124 InstanceKlass(const ClassFileParser& parser, unsigned kind);
125
126 public:
127 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
128
129 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
130 // of the class loading & initialization procedure, and the use of the states.
131 enum ClassState {
132 allocated, // allocated (but not yet linked)
133 loaded, // loaded and inserted in class hierarchy (but not linked yet)
134 linked, // successfully linked/verified (but not initialized yet)
135 being_initialized, // currently running class initializer
136 fully_initialized, // initialized (successfull final state)
137 initialization_error // error happened during initialization
138 };
139
140 static int number_of_instance_classes() { return _total_instanceKlass_count; }
141
142 private:
143 static volatile int _total_instanceKlass_count;
144 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
145
146 protected:
147 // Annotations for this class
148 Annotations* _annotations;
149 // Package this class is defined in
150 PackageEntry* _package_entry;
151 // Array classes holding elements of this class.
152 Klass* volatile _array_klasses;
153 // Constant pool for this class.
154 ConstantPool* _constants;
155 // The InnerClasses attribute and EnclosingMethod attribute. The
156 // _inner_classes is an array of shorts. If the class has InnerClasses
157 // attribute, then the _inner_classes array begins with 4-tuples of shorts
158 // [inner_class_info_index, outer_class_info_index,
159 // inner_name_index, inner_class_access_flags] for the InnerClasses
160 // attribute. If the EnclosingMethod attribute exists, it occupies the
161 // last two shorts [class_index, method_index] of the array. If only
162 // the InnerClasses attribute exists, the _inner_classes array length is
163 // number_of_inner_classes * 4. If the class has both InnerClasses
164 // and EnclosingMethod attributes the _inner_classes array length is
165 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
166 Array<jushort>* _inner_classes;
167
168 // the source debug extension for this klass, NULL if not specified.
169 // Specified as UTF-8 string without terminating zero byte in the classfile,
170 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
171 const char* _source_debug_extension;
172 // Array name derived from this class which needs unreferencing
173 // if this class is unloaded.
174 Symbol* _array_name;
175
176 // Number of heapOopSize words used by non-static fields in this klass
177 // (including inherited fields but after header_size()).
178 int _nonstatic_field_size;
179 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
180 // Constant pool index to the utf8 entry of the Generic signature,
181 // or 0 if none.
182 u2 _generic_signature_index;
183 // Constant pool index to the utf8 entry for the name of source file
184 // containing this klass, 0 if not specified.
185 u2 _source_file_name_index;
186 u2 _static_oop_field_count;// number of static oop fields in this klass
187 u2 _java_fields_count; // The number of declared Java fields
188 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
189
190 int _itable_len; // length of Java itable (in words)
191 // _is_marked_dependent can be set concurrently, thus cannot be part of the
192 // _misc_flags.
193 bool _is_marked_dependent; // used for marking during flushing and deoptimization
194 bool _is_being_redefined; // used for locking redefinition
195
196 // The low two bits of _misc_flags contains the kind field.
197 // This can be used to quickly discriminate among the four kinds of
198 // InstanceKlass.
199
200 static const unsigned _misc_kind_field_size = 2;
201 static const unsigned _misc_kind_field_pos = 0;
202 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
203
204 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
205 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
206 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
207 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
208
209 // Start after _misc_kind field.
210 enum {
211 _misc_rewritten = 1 << 2, // methods rewritten.
212 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
213 _misc_should_verify_class = 1 << 4, // allow caching of preverification
214 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
215 _misc_is_contended = 1 << 6, // marked with contended annotation
216 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
217 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
218 _misc_has_been_redefined = 1 << 9, // class has been redefined
219 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
220 // code source was found to be matching the value recorded by AOT.
221 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
222 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
223 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
224 _misc_is_shared_app_class = 1 << 14 // defining class loader is app class loader
225 };
226 u2 loader_type_bits() {
227 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
228 }
229 u2 _misc_flags;
230 u2 _minor_version; // minor version number of class file
231 u2 _major_version; // major version number of class file
232 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
233 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
234 MemberNameTable* _member_names; // Member names
235 JNIid* _jni_ids; // First JNI identifier for static fields in this class
236 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
237 intptr_t _dep_context; // packed DependencyContext structure
238 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
239 #if INCLUDE_JVMTI
240 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
241 // Linked instanceKlasses of previous versions
242 InstanceKlass* _previous_versions;
243 // JVMTI fields can be moved to their own structure - see 6315920
244 // JVMTI: cached class file, before retransformable agent modified it in CFLH
245 JvmtiCachedClassFileData* _cached_class_file;
246 #endif
247
248 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
249
250 // Class states are defined as ClassState (see above).
251 // Place the _init_state here to utilize the unused 2-byte after
252 // _idnum_allocated_count.
253 u1 _init_state; // state of class
254 u1 _reference_type; // reference type
255
256 #if INCLUDE_JVMTI
257 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
258 #endif
259
260 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
261
262 // Method array.
263 Array<Method*>* _methods;
264 // Default Method Array, concrete methods inherited from interfaces
265 Array<Method*>* _default_methods;
266 // Interface (Klass*s) this class declares locally to implement.
267 Array<Klass*>* _local_interfaces;
268 // Interface (Klass*s) this class implements transitively.
269 Array<Klass*>* _transitive_interfaces;
270 // Int array containing the original order of method in the class file (for JVMTI).
271 Array<int>* _method_ordering;
272 // Int array containing the vtable_indices for default_methods
273 // offset matches _default_methods offset
274 Array<int>* _default_vtable_indices;
275
276 // Instance and static variable information, starts with 6-tuples of shorts
277 // [access, name index, sig index, initval index, low_offset, high_offset]
278 // for all fields, followed by the generic signature data at the end of
279 // the array. Only fields with generic signature attributes have the generic
280 // signature data set in the array. The fields array looks like following:
281 //
282 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
283 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
284 // ...
285 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
286 // [generic signature index]
287 // [generic signature index]
288 // ...
289 Array<u2>* _fields;
290
291 // embedded Java vtable follows here
292 // embedded Java itables follows here
293 // embedded static fields follows here
294 // embedded nonstatic oop-map blocks follows here
295 // embedded implementor of this interface follows here
296 // The embedded implementor only exists if the current klass is an
297 // iterface. The possible values of the implementor fall into following
298 // three cases:
299 // NULL: no implementor.
300 // A Klass* that's not itself: one implementor.
301 // Itself: more than one implementors.
302 // embedded host klass follows here
303 // The embedded host klass only exists in an anonymous class for
304 // dynamic language support (JSR 292 enabled). The host class grants
305 // its access privileges to this class also. The host class is either
306 // named, or a previously loaded anonymous class. A non-anonymous class
307 // or an anonymous class loaded through normal classloading does not
308 // have this embedded field.
309 //
310
311 friend class SystemDictionary;
312
313 public:
314 u2 loader_type() {
315 return _misc_flags & loader_type_bits();
316 }
317
318 bool is_shared_boot_class() const {
319 return (_misc_flags & _misc_is_shared_boot_class) != 0;
320 }
321 bool is_shared_platform_class() const {
322 return (_misc_flags & _misc_is_shared_platform_class) != 0;
323 }
324 bool is_shared_app_class() const {
325 return (_misc_flags & _misc_is_shared_app_class) != 0;
326 }
327
328 void set_class_loader_type(s2 loader_type) {
329 assert(( _misc_flags & loader_type_bits()) == 0,
330 "Should only be called once for each class.");
331 switch (loader_type) {
332 case ClassLoader::BOOT_LOADER:
333 _misc_flags |= _misc_is_shared_boot_class;
334 break;
335 case ClassLoader::PLATFORM_LOADER:
336 _misc_flags |= _misc_is_shared_platform_class;
337 break;
338 case ClassLoader::APP_LOADER:
339 _misc_flags |= _misc_is_shared_app_class;
340 break;
341 default:
342 ShouldNotReachHere();
343 break;
344 }
345 }
346
347 bool has_nonstatic_fields() const {
348 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
349 }
350 void set_has_nonstatic_fields(bool b) {
351 if (b) {
352 _misc_flags |= _misc_has_nonstatic_fields;
353 } else {
354 _misc_flags &= ~_misc_has_nonstatic_fields;
355 }
356 }
357
358 // field sizes
359 int nonstatic_field_size() const { return _nonstatic_field_size; }
360 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
361
362 int static_field_size() const { return _static_field_size; }
363 void set_static_field_size(int size) { _static_field_size = size; }
364
365 int static_oop_field_count() const { return (int)_static_oop_field_count; }
366 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
367
368 // Java itable
369 int itable_length() const { return _itable_len; }
370 void set_itable_length(int len) { _itable_len = len; }
371
372 // array klasses
373 Klass* array_klasses() const { return _array_klasses; }
374 inline Klass* array_klasses_acquire() const; // load with acquire semantics
375 void set_array_klasses(Klass* k) { _array_klasses = k; }
376 inline void release_set_array_klasses(Klass* k); // store with release semantics
377
378 // methods
379 Array<Method*>* methods() const { return _methods; }
380 void set_methods(Array<Method*>* a) { _methods = a; }
381 Method* method_with_idnum(int idnum);
382 Method* method_with_orig_idnum(int idnum);
383 Method* method_with_orig_idnum(int idnum, int version);
384
385 // method ordering
386 Array<int>* method_ordering() const { return _method_ordering; }
387 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
388 void copy_method_ordering(const intArray* m, TRAPS);
389
390 // default_methods
391 Array<Method*>* default_methods() const { return _default_methods; }
392 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
393
394 // default method vtable_indices
395 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
396 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
397 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
398
399 // interfaces
400 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
401 void set_local_interfaces(Array<Klass*>* a) {
402 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
403 _local_interfaces = a; }
404
405 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
406 void set_transitive_interfaces(Array<Klass*>* a) {
407 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
408 _transitive_interfaces = a;
409 }
410
411 private:
412 friend class fieldDescriptor;
413 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
414
415 public:
416 int field_offset (int index) const { return field(index)->offset(); }
417 int field_access_flags(int index) const { return field(index)->access_flags(); }
418 Symbol* field_name (int index) const { return field(index)->name(constants()); }
419 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
420
421 // Number of Java declared fields
422 int java_fields_count() const { return (int)_java_fields_count; }
423
424 Array<u2>* fields() const { return _fields; }
425 void set_fields(Array<u2>* f, u2 java_fields_count) {
426 guarantee(_fields == NULL || f == NULL, "Just checking");
427 _fields = f;
428 _java_fields_count = java_fields_count;
429 }
430
431 // inner classes
432 Array<u2>* inner_classes() const { return _inner_classes; }
433 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
434
435 enum InnerClassAttributeOffset {
436 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
437 inner_class_inner_class_info_offset = 0,
438 inner_class_outer_class_info_offset = 1,
439 inner_class_inner_name_offset = 2,
440 inner_class_access_flags_offset = 3,
441 inner_class_next_offset = 4
442 };
443
444 enum EnclosingMethodAttributeOffset {
445 enclosing_method_class_index_offset = 0,
446 enclosing_method_method_index_offset = 1,
447 enclosing_method_attribute_size = 2
448 };
449
450 // method override check
451 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
452
453 // package
454 PackageEntry* package() const { return _package_entry; }
455 ModuleEntry* module() const;
456 bool in_unnamed_package() const { return (_package_entry == NULL); }
457 void set_package(PackageEntry* p) { _package_entry = p; }
458 void set_package(ClassLoaderData* loader_data, TRAPS);
459 bool is_same_class_package(const Klass* class2) const;
460 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
461 static bool is_same_class_package(oop class_loader1,
462 const Symbol* class_name1,
463 oop class_loader2,
464 const Symbol* class_name2);
465
466 // find an enclosing class
467 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const {
468 return compute_enclosing_class_impl(this, inner_is_member, THREAD);
469 }
470 static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self,
471 bool* inner_is_member,
472 TRAPS);
473
474 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
475 static bool find_inner_classes_attr(const InstanceKlass* k,
476 int* ooff, int* noff, TRAPS);
477
478 private:
479 // Check prohibited package ("java/" only loadable by boot or platform loaders)
480 static void check_prohibited_package(Symbol* class_name,
481 Handle class_loader,
482 TRAPS);
483 public:
484 // tell if two classes have the same enclosing class (at package level)
485 bool is_same_package_member(const Klass* class2, TRAPS) const {
486 return is_same_package_member_impl(this, class2, THREAD);
487 }
488 static bool is_same_package_member_impl(const InstanceKlass* self,
489 const Klass* class2,
490 TRAPS);
491
492 // initialization state
493 bool is_loaded() const { return _init_state >= loaded; }
494 bool is_linked() const { return _init_state >= linked; }
495 bool is_initialized() const { return _init_state == fully_initialized; }
496 bool is_not_initialized() const { return _init_state < being_initialized; }
497 bool is_being_initialized() const { return _init_state == being_initialized; }
498 bool is_in_error_state() const { return _init_state == initialization_error; }
499 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
500 ClassState init_state() { return (ClassState)_init_state; }
501 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
502
503 // defineClass specified verification
504 bool should_verify_class() const {
505 return (_misc_flags & _misc_should_verify_class) != 0;
506 }
507 void set_should_verify_class(bool value) {
508 if (value) {
509 _misc_flags |= _misc_should_verify_class;
510 } else {
511 _misc_flags &= ~_misc_should_verify_class;
512 }
513 }
514
515 // marking
516 bool is_marked_dependent() const { return _is_marked_dependent; }
517 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
518
519 // initialization (virtuals from Klass)
520 bool should_be_initialized() const; // means that initialize should be called
521 void initialize(TRAPS);
522 void link_class(TRAPS);
523 bool link_class_or_fail(TRAPS); // returns false on failure
524 void unlink_class();
525 void rewrite_class(TRAPS);
526 void link_methods(TRAPS);
527 Method* class_initializer() const;
528
529 // set the class to initialized if no static initializer is present
530 void eager_initialize(Thread *thread);
531
532 // reference type
533 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
534 void set_reference_type(ReferenceType t) {
535 assert(t == (u1)t, "overflow");
536 _reference_type = (u1)t;
537 }
538
539 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
540
541 // find local field, returns true if found
542 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
543 // find field in direct superinterfaces, returns the interface in which the field is defined
544 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
545 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
546 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
547 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
548 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
549
550 // find a non-static or static field given its offset within the class.
551 bool contains_field_offset(int offset) {
552 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
553 }
554
555 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
556 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
557
558 // find a local method (returns NULL if not found)
559 Method* find_method(const Symbol* name, const Symbol* signature) const;
560 static Method* find_method(const Array<Method*>* methods,
561 const Symbol* name,
562 const Symbol* signature);
563
564 // find a local method, but skip static methods
565 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
566 static Method* find_instance_method(const Array<Method*>* methods,
567 const Symbol* name,
568 const Symbol* signature);
569
570 // find a local method (returns NULL if not found)
571 Method* find_local_method(const Symbol* name,
572 const Symbol* signature,
573 OverpassLookupMode overpass_mode,
574 StaticLookupMode static_mode,
575 PrivateLookupMode private_mode) const;
576
577 // find a local method from given methods array (returns NULL if not found)
578 static Method* find_local_method(const Array<Method*>* methods,
579 const Symbol* name,
580 const Symbol* signature,
581 OverpassLookupMode overpass_mode,
582 StaticLookupMode static_mode,
583 PrivateLookupMode private_mode);
584
585 // find a local method index in methods or default_methods (returns -1 if not found)
586 static int find_method_index(const Array<Method*>* methods,
587 const Symbol* name,
588 const Symbol* signature,
589 OverpassLookupMode overpass_mode,
590 StaticLookupMode static_mode,
591 PrivateLookupMode private_mode);
592
593 // lookup operation (returns NULL if not found)
594 Method* uncached_lookup_method(const Symbol* name,
595 const Symbol* signature,
596 OverpassLookupMode overpass_mode) const;
597
598 // lookup a method in all the interfaces that this class implements
599 // (returns NULL if not found)
600 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
601
602 // lookup a method in local defaults then in all interfaces
603 // (returns NULL if not found)
604 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
605
606 // Find method indices by name. If a method with the specified name is
607 // found the index to the first method is returned, and 'end' is filled in
608 // with the index of first non-name-matching method. If no method is found
609 // -1 is returned.
610 int find_method_by_name(const Symbol* name, int* end) const;
611 static int find_method_by_name(const Array<Method*>* methods,
612 const Symbol* name, int* end);
613
614 // constant pool
615 ConstantPool* constants() const { return _constants; }
616 void set_constants(ConstantPool* c) { _constants = c; }
617
618 // protection domain
619 oop protection_domain() const;
620
621 // signers
622 objArrayOop signers() const;
623
624 // host class
625 InstanceKlass* host_klass() const {
626 InstanceKlass** hk = adr_host_klass();
627 if (hk == NULL) {
628 return NULL;
629 } else {
630 assert(*hk != NULL, "host klass should always be set if the address is not null");
631 return *hk;
632 }
633 }
634 void set_host_klass(const InstanceKlass* host) {
635 assert(is_anonymous(), "not anonymous");
636 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
637 assert(addr != NULL, "no reversed space");
638 if (addr != NULL) {
639 *addr = host;
640 }
641 }
642 bool is_anonymous() const {
643 return (_misc_flags & _misc_is_anonymous) != 0;
644 }
645 void set_is_anonymous(bool value) {
646 if (value) {
647 _misc_flags |= _misc_is_anonymous;
648 } else {
649 _misc_flags &= ~_misc_is_anonymous;
650 }
651 }
652
653 // Oop that keeps the metadata for this class from being unloaded
654 // in places where the metadata is stored in other places, like nmethods
655 oop klass_holder() const {
656 return is_anonymous() ? java_mirror() : class_loader();
657 }
658
659 bool is_contended() const {
660 return (_misc_flags & _misc_is_contended) != 0;
661 }
662 void set_is_contended(bool value) {
663 if (value) {
664 _misc_flags |= _misc_is_contended;
665 } else {
666 _misc_flags &= ~_misc_is_contended;
667 }
668 }
669
670 // source file name
671 Symbol* source_file_name() const {
672 return (_source_file_name_index == 0) ?
673 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
674 }
675 u2 source_file_name_index() const {
676 return _source_file_name_index;
677 }
678 void set_source_file_name_index(u2 sourcefile_index) {
679 _source_file_name_index = sourcefile_index;
680 }
681
682 // minor and major version numbers of class file
683 u2 minor_version() const { return _minor_version; }
684 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
685 u2 major_version() const { return _major_version; }
686 void set_major_version(u2 major_version) { _major_version = major_version; }
687
688 // source debug extension
689 const char* source_debug_extension() const { return _source_debug_extension; }
690 void set_source_debug_extension(const char* array, int length);
691
692 // symbol unloading support (refcount already added)
693 Symbol* array_name() { return _array_name; }
694 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
695
696 // nonstatic oop-map blocks
697 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
698 return oop_map_count * OopMapBlock::size_in_words();
699 }
700 unsigned int nonstatic_oop_map_count() const {
701 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
702 }
703 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
704 void set_nonstatic_oop_map_size(int words) {
705 _nonstatic_oop_map_size = words;
706 }
707
708 #if INCLUDE_JVMTI
709 // Redefinition locking. Class can only be redefined by one thread at a time.
710 bool is_being_redefined() const { return _is_being_redefined; }
711 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
712
713 // RedefineClasses() support for previous versions:
714 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
715 void purge_previous_version_list();
716
717 InstanceKlass* previous_versions() const { return _previous_versions; }
718 #else
719 InstanceKlass* previous_versions() const { return NULL; }
720 #endif
721
722 InstanceKlass* get_klass_version(int version) {
723 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
724 if (ik->constants()->version() == version) {
725 return ik;
726 }
727 }
728 return NULL;
729 }
730
731 bool has_been_redefined() const {
732 return (_misc_flags & _misc_has_been_redefined) != 0;
733 }
734 void set_has_been_redefined() {
735 _misc_flags |= _misc_has_been_redefined;
736 }
737
738 bool has_passed_fingerprint_check() const {
739 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
740 }
741 void set_has_passed_fingerprint_check(bool b) {
742 if (b) {
743 _misc_flags |= _misc_has_passed_fingerprint_check;
744 } else {
745 _misc_flags &= ~_misc_has_passed_fingerprint_check;
746 }
747 }
748 bool supers_have_passed_fingerprint_checks();
749
750 static bool should_store_fingerprint();
751 bool has_stored_fingerprint() const;
752 uint64_t get_stored_fingerprint() const;
753 void store_fingerprint(uint64_t fingerprint);
754
755 bool is_scratch_class() const {
756 return (_misc_flags & _misc_is_scratch_class) != 0;
757 }
758
759 void set_is_scratch_class() {
760 _misc_flags |= _misc_is_scratch_class;
761 }
762
763 private:
764
765 void set_kind(unsigned kind) {
766 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
767 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
768 unsigned flags = _misc_flags & ~fmask;
769 _misc_flags = (flags | (kind << _misc_kind_field_pos));
770 }
771
772 bool is_kind(unsigned desired) const {
773 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
774 return kind == desired;
775 }
776
777 public:
778
779 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
780 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
781 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
782 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
783 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
784
785 #if INCLUDE_JVMTI
786
787 void init_previous_versions() {
788 _previous_versions = NULL;
789 }
790
791 private:
792 static bool _has_previous_versions;
793 public:
794 static void purge_previous_versions(InstanceKlass* ik) {
795 if (ik->has_been_redefined()) {
796 ik->purge_previous_version_list();
797 }
798 }
799
800 static bool has_previous_versions_and_reset();
801
802 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
803 void set_cached_class_file(JvmtiCachedClassFileData *data) {
804 _cached_class_file = data;
805 }
806 JvmtiCachedClassFileData * get_cached_class_file();
807 jint get_cached_class_file_len();
808 unsigned char * get_cached_class_file_bytes();
809
810 // JVMTI: Support for caching of field indices, types, and offsets
811 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
812 _jvmti_cached_class_field_map = descriptor;
813 }
814 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
815 return _jvmti_cached_class_field_map;
816 }
817
818 #if INCLUDE_CDS
819 void set_archived_class_data(JvmtiCachedClassFileData* data) {
820 _cached_class_file = data;
821 }
822
823 JvmtiCachedClassFileData * get_archived_class_data();
824 #endif // INCLUDE_CDS
825 #else // INCLUDE_JVMTI
826
827 static void purge_previous_versions(InstanceKlass* ik) { return; };
828 static bool has_previous_versions_and_reset() { return false; }
829
830 void set_cached_class_file(JvmtiCachedClassFileData *data) {
831 assert(data == NULL, "unexpected call with JVMTI disabled");
832 }
833 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
834
835 #endif // INCLUDE_JVMTI
836
837 bool has_nonstatic_concrete_methods() const {
838 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
839 }
840 void set_has_nonstatic_concrete_methods(bool b) {
841 if (b) {
842 _misc_flags |= _misc_has_nonstatic_concrete_methods;
843 } else {
844 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
845 }
846 }
847
848 bool declares_nonstatic_concrete_methods() const {
849 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
850 }
851 void set_declares_nonstatic_concrete_methods(bool b) {
852 if (b) {
853 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
854 } else {
855 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
856 }
857 }
858
859 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
860 inline u2 next_method_idnum();
861 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
862
863 // generics support
864 Symbol* generic_signature() const {
865 return (_generic_signature_index == 0) ?
866 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
867 }
868 u2 generic_signature_index() const {
869 return _generic_signature_index;
870 }
871 void set_generic_signature_index(u2 sig_index) {
872 _generic_signature_index = sig_index;
873 }
874
875 u2 enclosing_method_data(int offset) const;
876 u2 enclosing_method_class_index() const {
877 return enclosing_method_data(enclosing_method_class_index_offset);
878 }
879 u2 enclosing_method_method_index() {
880 return enclosing_method_data(enclosing_method_method_index_offset);
881 }
882 void set_enclosing_method_indices(u2 class_index,
883 u2 method_index);
884
885 // jmethodID support
886 static jmethodID get_jmethod_id(InstanceKlass* ik,
887 const methodHandle& method_h);
888 static jmethodID get_jmethod_id_fetch_or_update(InstanceKlass* ik,
889 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
890 jmethodID* to_dealloc_id_p,
891 jmethodID** to_dealloc_jmeths_p);
892 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
893 size_t *length_p, jmethodID* id_p);
894 void ensure_space_for_methodids(int start_offset = 0);
895 jmethodID jmethod_id_or_null(Method* method);
896
897 // annotations support
898 Annotations* annotations() const { return _annotations; }
899 void set_annotations(Annotations* anno) { _annotations = anno; }
900
901 AnnotationArray* class_annotations() const {
902 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
903 }
904 Array<AnnotationArray*>* fields_annotations() const {
905 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
906 }
907 AnnotationArray* class_type_annotations() const {
908 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
909 }
910 Array<AnnotationArray*>* fields_type_annotations() const {
911 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
912 }
913 // allocation
914 instanceOop allocate_instance(TRAPS);
915
916 // additional member function to return a handle
917 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
918
919 objArrayOop allocate_objArray(int n, int length, TRAPS);
920 // Helper function
921 static instanceOop register_finalizer(instanceOop i, TRAPS);
922
923 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
924 // if not, throw either an Error or an Exception.
925 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
926
927 // initialization
928 void call_class_initializer(TRAPS);
929 void set_initialization_state_and_notify(ClassState state, TRAPS);
930
931 // OopMapCache support
932 OopMapCache* oop_map_cache() { return _oop_map_cache; }
933 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
934 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
935
936 // JNI identifier support (for static fields - for jni performance)
937 JNIid* jni_ids() { return _jni_ids; }
938 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
939 JNIid* jni_id_for(int offset);
940
941 // maintenance of deoptimization dependencies
942 inline DependencyContext dependencies();
943 int mark_dependent_nmethods(KlassDepChange& changes);
944 void add_dependent_nmethod(nmethod* nm);
945 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
946
947 // On-stack replacement support
948 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
949 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
950 void add_osr_nmethod(nmethod* n);
951 bool remove_osr_nmethod(nmethod* n);
952 int mark_osr_nmethods(const Method* m);
953 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
954
955 #if INCLUDE_JVMTI
956 // Breakpoint support (see methods on Method* for details)
957 BreakpointInfo* breakpoints() const { return _breakpoints; };
958 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
959 #endif
960
961 // support for stub routines
962 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
963 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
964 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
965
966 // subclass/subinterface checks
967 bool implements_interface(Klass* k) const;
968 bool is_same_or_direct_interface(Klass* k) const;
969
970 #ifdef ASSERT
971 // check whether this class or one of its superclasses was redefined
972 bool has_redefined_this_or_super() const;
973 #endif
974
975 // Access to the implementor of an interface.
976 Klass* implementor() const
977 {
978 Klass** k = adr_implementor();
979 if (k == NULL) {
980 return NULL;
981 } else {
982 return *k;
983 }
984 }
985
986 void set_implementor(Klass* k) {
987 assert(is_interface(), "not interface");
988 Klass** addr = adr_implementor();
989 assert(addr != NULL, "null addr");
990 if (addr != NULL) {
991 *addr = k;
992 }
993 }
994
995 int nof_implementors() const {
996 Klass* k = implementor();
997 if (k == NULL) {
998 return 0;
999 } else if (k != this) {
1000 return 1;
1001 } else {
1002 return 2;
1003 }
1004 }
1005
1006 void add_implementor(Klass* k); // k is a new class that implements this interface
1007 void init_implementor(); // initialize
1008
1009 // link this class into the implementors list of every interface it implements
1010 void process_interfaces(Thread *thread);
1011
1012 // virtual operations from Klass
1013 bool is_leaf_class() const { return _subklass == NULL; }
1014 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1015 bool compute_is_subtype_of(Klass* k);
1016 bool can_be_primary_super_slow() const;
1017 int oop_size(oop obj) const { return size_helper(); }
1018 // slow because it's a virtual call and used for verifying the layout_helper.
1019 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1020 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1021
1022 // Iterators
1023 void do_local_static_fields(FieldClosure* cl);
1024 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1025 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1026
1027 void methods_do(void f(Method* method));
1028 void array_klasses_do(void f(Klass* k));
1029 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1030 bool super_types_do(SuperTypeClosure* blk);
1031
1032 static InstanceKlass* cast(Klass* k) {
1033 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1034 }
1035
1036 static const InstanceKlass* cast(const Klass* k) {
1037 assert(k != NULL, "k should not be null");
1038 assert(k->is_instance_klass(), "cast to InstanceKlass");
1039 return static_cast<const InstanceKlass*>(k);
1040 }
1041
1042 InstanceKlass* java_super() const {
1043 return (super() == NULL) ? NULL : cast(super());
1044 }
1045
1046 // Sizing (in words)
1047 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1048
1049 static int size(int vtable_length, int itable_length,
1050 int nonstatic_oop_map_size,
1051 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) {
1052 return align_metadata_size(header_size() +
1053 vtable_length +
1054 itable_length +
1055 nonstatic_oop_map_size +
1056 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1057 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1058 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1059 }
1060 int size() const { return size(vtable_length(),
1061 itable_length(),
1062 nonstatic_oop_map_size(),
1063 is_interface(),
1064 is_anonymous(),
1065 has_stored_fingerprint());
1066 }
1067 #if INCLUDE_SERVICES
1068 virtual void collect_statistics(KlassSizeStats *sz) const;
1069 #endif
1070
1071 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1072 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1073
1074 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1075
1076 address static_field_addr(int offset);
1077
1078 OopMapBlock* start_of_nonstatic_oop_maps() const {
1079 return (OopMapBlock*)(start_of_itable() + itable_length());
1080 }
1081
1082 Klass** end_of_nonstatic_oop_maps() const {
1083 return (Klass**)(start_of_nonstatic_oop_maps() +
1084 nonstatic_oop_map_count());
1085 }
1086
1087 Klass** adr_implementor() const {
1088 if (is_interface()) {
1089 return (Klass**)end_of_nonstatic_oop_maps();
1090 } else {
1091 return NULL;
1092 }
1093 };
1094
1095 InstanceKlass** adr_host_klass() const {
1096 if (is_anonymous()) {
1097 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1098 if (adr_impl != NULL) {
1099 return adr_impl + 1;
1100 } else {
1101 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1102 }
1103 } else {
1104 return NULL;
1105 }
1106 }
1107
1108 address adr_fingerprint() const {
1109 if (has_stored_fingerprint()) {
1110 InstanceKlass** adr_host = adr_host_klass();
1111 if (adr_host != NULL) {
1112 return (address)(adr_host + 1);
1113 }
1114
1115 Klass** adr_impl = adr_implementor();
1116 if (adr_impl != NULL) {
1117 return (address)(adr_impl + 1);
1118 }
1119
1120 return (address)end_of_nonstatic_oop_maps();
1121 } else {
1122 return NULL;
1123 }
1124 }
1125
1126 // Use this to return the size of an instance in heap words:
1127 int size_helper() const {
1128 return layout_helper_to_size_helper(layout_helper());
1129 }
1130
1131 // This bit is initialized in classFileParser.cpp.
1132 // It is false under any of the following conditions:
1133 // - the class is abstract (including any interface)
1134 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1135 // - the class size is larger than FastAllocateSizeLimit
1136 // - the class is java/lang/Class, which cannot be allocated directly
1137 bool can_be_fastpath_allocated() const {
1138 return !layout_helper_needs_slow_path(layout_helper());
1139 }
1140
1141 // Java itable
1142 klassItable* itable() const; // return new klassItable wrapper
1143 Method* method_at_itable(Klass* holder, int index, TRAPS);
1144
1145 #if INCLUDE_JVMTI
1146 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1147 #endif // INCLUDE_JVMTI
1148
1149 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1150 void clean_implementors_list(BoolObjectClosure* is_alive);
1151 void clean_method_data(BoolObjectClosure* is_alive);
1152
1153 // Explicit metaspace deallocation of fields
1154 // For RedefineClasses and class file parsing errors, we need to deallocate
1155 // instanceKlasses and the metadata they point to.
1156 void deallocate_contents(ClassLoaderData* loader_data);
1157 static void deallocate_methods(ClassLoaderData* loader_data,
1158 Array<Method*>* methods);
1159 void static deallocate_interfaces(ClassLoaderData* loader_data,
1160 const Klass* super_klass,
1161 Array<Klass*>* local_interfaces,
1162 Array<Klass*>* transitive_interfaces);
1163
1164 // The constant pool is on stack if any of the methods are executing or
1165 // referenced by handles.
1166 bool on_stack() const { return _constants->on_stack(); }
1167
1168 // callbacks for actions during class unloading
1169 static void notify_unload_class(InstanceKlass* ik);
1170 static void release_C_heap_structures(InstanceKlass* ik);
1171
1172 // Naming
1173 const char* signature_name() const;
1174 static Symbol* package_from_name(const Symbol* name, TRAPS);
1175
1176 // GC specific object visitors
1177 //
1178 // Mark Sweep
1179 int oop_ms_adjust_pointers(oop obj);
1180 #if INCLUDE_ALL_GCS
1181 // Parallel Scavenge
1182 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1183 // Parallel Compact
1184 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1185 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1186 #endif
1187
1188 // Oop fields (and metadata) iterators
1189 // [nv = true] Use non-virtual calls to do_oop_nv.
1190 // [nv = false] Use virtual calls to do_oop.
1191 //
1192 // The InstanceKlass iterators also visits the Object's klass.
1193
1194 // Forward iteration
1195 public:
1196 // Iterate over all oop fields in the oop maps.
1197 template <bool nv, class OopClosureType>
1198 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1199
1200 protected:
1201 // Iterate over all oop fields and metadata.
1202 template <bool nv, class OopClosureType>
1203 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1204
1205 private:
1206 // Iterate over all oop fields in the oop maps.
1207 // Specialized for [T = oop] or [T = narrowOop].
1208 template <bool nv, typename T, class OopClosureType>
1209 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1210
1211 // Iterate over all oop fields in one oop map.
1212 template <bool nv, typename T, class OopClosureType>
1213 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1214
1215
1216 // Reverse iteration
1217 #if INCLUDE_ALL_GCS
1218 public:
1219 // Iterate over all oop fields in the oop maps.
1220 template <bool nv, class OopClosureType>
1221 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1222
1223 protected:
1224 // Iterate over all oop fields and metadata.
1225 template <bool nv, class OopClosureType>
1226 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1227
1228 private:
1229 // Iterate over all oop fields in the oop maps.
1230 // Specialized for [T = oop] or [T = narrowOop].
1231 template <bool nv, typename T, class OopClosureType>
1232 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1233
1234 // Iterate over all oop fields in one oop map.
1235 template <bool nv, typename T, class OopClosureType>
1236 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1237 #endif
1238
1239
1240 // Bounded range iteration
1241 public:
1242 // Iterate over all oop fields in the oop maps.
1243 template <bool nv, class OopClosureType>
1244 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1245
1246 protected:
1247 // Iterate over all oop fields and metadata.
1248 template <bool nv, class OopClosureType>
1249 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1250
1251 private:
1252 // Iterate over all oop fields in the oop maps.
1253 // Specialized for [T = oop] or [T = narrowOop].
1254 template <bool nv, typename T, class OopClosureType>
1255 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1256
1257 // Iterate over all oop fields in one oop map.
1258 template <bool nv, typename T, class OopClosureType>
1259 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1260
1261
1262 public:
1263
1264 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1265 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1266
1267 #if INCLUDE_ALL_GCS
1268 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1269 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1270 #endif // INCLUDE_ALL_GCS
1271
1272 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1273
1274 public:
1275 void set_in_error_state() {
1276 assert(DumpSharedSpaces, "only call this when dumping archive");
1277 _init_state = initialization_error;
1278 }
1279 bool check_sharing_error_state();
1280
1281 private:
1282 // initialization state
1283 #ifdef ASSERT
1284 void set_init_state(ClassState state);
1285 #else
1286 void set_init_state(ClassState state) { _init_state = (u1)state; }
1287 #endif
1288 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1289 void set_init_thread(Thread *thread) { _init_thread = thread; }
1290
1291 // The RedefineClasses() API can cause new method idnums to be needed
1292 // which will cause the caches to grow. Safety requires different
1293 // cache management logic if the caches can grow instead of just
1294 // going from NULL to non-NULL.
1295 bool idnum_can_increment() const { return has_been_redefined(); }
1296 inline jmethodID* methods_jmethod_ids_acquire() const;
1297 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1298
1299 // Lock during initialization
1300 public:
1301 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1302 // Must be one per class and it has to be a VM internal object so java code
1303 // cannot lock it (like the mirror).
1304 // It has to be an object not a Mutex because it's held through java calls.
1305 oop init_lock() const;
1306 private:
1307 void fence_and_clear_init_lock();
1308
1309 // Static methods that are used to implement member methods where an exposed this pointer
1310 // is needed due to possible GCs
1311 static bool link_class_impl (InstanceKlass* this_k, bool throw_verifyerror, TRAPS);
1312 static bool verify_code (InstanceKlass* this_k, bool throw_verifyerror, TRAPS);
1313 static void initialize_impl (InstanceKlass* this_k, TRAPS);
1314 static void initialize_super_interfaces (InstanceKlass* this_k, TRAPS);
1315 static void eager_initialize_impl (InstanceKlass* this_k);
1316 static void set_initialization_state_and_notify_impl (InstanceKlass* this_k, ClassState state, TRAPS);
1317 static void call_class_initializer_impl (InstanceKlass* this_k, TRAPS);
1318 static Klass* array_klass_impl (InstanceKlass* this_k, bool or_null, int n, TRAPS);
1319 static void do_local_static_fields_impl (InstanceKlass* this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1320 /* jni_id_for_impl for jfieldID only */
1321 static JNIid* jni_id_for_impl (InstanceKlass* this_k, int offset);
1322
1323 // Returns the array class for the n'th dimension
1324 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1325
1326 // Returns the array class with this class as element type
1327 Klass* array_klass_impl(bool or_null, TRAPS);
1328
1329 // find a local method (returns NULL if not found)
1330 Method* find_method_impl(const Symbol* name,
1331 const Symbol* signature,
1332 OverpassLookupMode overpass_mode,
1333 StaticLookupMode static_mode,
1334 PrivateLookupMode private_mode) const;
1335
1336 static Method* find_method_impl(const Array<Method*>* methods,
1337 const Symbol* name,
1338 const Symbol* signature,
1339 OverpassLookupMode overpass_mode,
1340 StaticLookupMode static_mode,
1341 PrivateLookupMode private_mode);
1342
1343 // Free CHeap allocated fields.
1344 void release_C_heap_structures();
1345
1346 #if INCLUDE_JVMTI
1347 // RedefineClasses support
1348 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1349 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1350 #endif
1351 public:
1352 // CDS support - remove and restore oops from metadata. Oops are not shared.
1353 virtual void remove_unshareable_info();
1354 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1355
1356 // jvm support
1357 jint compute_modifier_flags(TRAPS) const;
1358
1359 // JSR-292 support
1360 MemberNameTable* member_names() { return _member_names; }
1361 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1362 oop add_member_name(Handle member_name, bool intern);
1363
1364 public:
1365 // JVMTI support
1366 jint jvmti_class_status() const;
1367
1368 public:
1369 // Printing
1370 #ifndef PRODUCT
1371 void print_on(outputStream* st) const;
1372 #endif
1373 void print_value_on(outputStream* st) const;
1374
1375 void oop_print_value_on(oop obj, outputStream* st);
1376
1377 #ifndef PRODUCT
1378 void oop_print_on (oop obj, outputStream* st);
1379
1380 void print_dependent_nmethods(bool verbose = false);
1381 bool is_dependent_nmethod(nmethod* nm);
1382 #endif
1383
1384 const char* internal_name() const;
1385
1386 // Verification
1387 void verify_on(outputStream* st);
1388
1389 void oop_verify_on(oop obj, outputStream* st);
1390
1391 // Logging
1392 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data,
1393 const char* module_name, const ClassFileStream* cfs) const;
1394 };
1395
1396 // for adding methods
1397 // UNSET_IDNUM return means no more ids available
1398 inline u2 InstanceKlass::next_method_idnum() {
1399 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1400 return ConstMethod::UNSET_IDNUM; // no more ids available
1401 } else {
1402 return _idnum_allocated_count++;
1403 }
1404 }
1405
1406
1407 /* JNIid class for jfieldIDs only */
1408 class JNIid: public CHeapObj<mtClass> {
1409 friend class VMStructs;
1410 private:
1411 Klass* _holder;
1412 JNIid* _next;
1413 int _offset;
1414 #ifdef ASSERT
1415 bool _is_static_field_id;
1416 #endif
1417
1418 public:
1419 // Accessors
1420 Klass* holder() const { return _holder; }
1421 int offset() const { return _offset; }
1422 JNIid* next() { return _next; }
1423 // Constructor
1424 JNIid(Klass* holder, int offset, JNIid* next);
1425 // Identifier lookup
1426 JNIid* find(int offset);
1427
1428 bool find_local_field(fieldDescriptor* fd) {
1429 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1430 }
1431
1432 static void deallocate(JNIid* id);
1433 // Debugging
1434 #ifdef ASSERT
1435 bool is_static_field_id() const { return _is_static_field_id; }
1436 void set_is_static_field_id() { _is_static_field_id = true; }
1437 #endif
1438 void verify(Klass* holder);
1439 };
1440
1441 // An iterator that's used to access the inner classes indices in the
1442 // InstanceKlass::_inner_classes array.
1443 class InnerClassesIterator : public StackObj {
1444 private:
1445 Array<jushort>* _inner_classes;
1446 int _length;
1447 int _idx;
1448 public:
1449
1450 InnerClassesIterator(const InstanceKlass* k) {
1451 _inner_classes = k->inner_classes();
1452 if (k->inner_classes() != NULL) {
1453 _length = _inner_classes->length();
1454 // The inner class array's length should be the multiple of
1455 // inner_class_next_offset if it only contains the InnerClasses
1456 // attribute data, or it should be
1457 // n*inner_class_next_offset+enclosing_method_attribute_size
1458 // if it also contains the EnclosingMethod data.
1459 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1460 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1461 "just checking");
1462 // Remove the enclosing_method portion if exists.
1463 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1464 _length -= InstanceKlass::enclosing_method_attribute_size;
1465 }
1466 } else {
1467 _length = 0;
1468 }
1469 _idx = 0;
1470 }
1471
1472 int length() const {
1473 return _length;
1474 }
1475
1476 void next() {
1477 _idx += InstanceKlass::inner_class_next_offset;
1478 }
1479
1480 bool done() const {
1481 return (_idx >= _length);
1482 }
1483
1484 u2 inner_class_info_index() const {
1485 return _inner_classes->at(
1486 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1487 }
1488
1489 void set_inner_class_info_index(u2 index) {
1490 _inner_classes->at_put(
1491 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1492 }
1493
1494 u2 outer_class_info_index() const {
1495 return _inner_classes->at(
1496 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1497 }
1498
1499 void set_outer_class_info_index(u2 index) {
1500 _inner_classes->at_put(
1501 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1502 }
1503
1504 u2 inner_name_index() const {
1505 return _inner_classes->at(
1506 _idx + InstanceKlass::inner_class_inner_name_offset);
1507 }
1508
1509 void set_inner_name_index(u2 index) {
1510 _inner_classes->at_put(
1511 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1512 }
1513
1514 u2 inner_access_flags() const {
1515 return _inner_classes->at(
1516 _idx + InstanceKlass::inner_class_access_flags_offset);
1517 }
1518 };
1519
1520 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP