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_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_OOPS_INSTANCEKLASS_HPP
27
28 #include "memory/referenceType.hpp"
29 #include "oops/annotations.hpp"
30 #include "oops/constMethod.hpp"
31 #include "oops/fieldInfo.hpp"
32 #include "oops/instanceKlassFlags.hpp"
33 #include "oops/instanceOop.hpp"
34 #include "runtime/handles.hpp"
35 #include "runtime/javaThread.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/align.hpp"
38 #include "utilities/growableArray.hpp"
39 #include "utilities/macros.hpp"
40 #if INCLUDE_JFR
41 #include "jfr/support/jfrKlassExtension.hpp"
42 #endif
43
44 class ConstantPool;
45 class DeoptimizationScope;
46 class klassItable;
47 class Monitor;
48 class RecordComponent;
49
50 // An InstanceKlass is the VM level representation of a Java class.
51 // It contains all information needed for at class at execution runtime.
52
53 // InstanceKlass embedded field layout (after declared fields):
54 // [EMBEDDED Java vtable ] size in words = vtable_len
55 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
56 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
57 // indicating where oops are located in instances of this klass.
58 // [EMBEDDED implementor of the interface] only exist for interface
59
60
61 // forward declaration for class -- see below for definition
62 #if INCLUDE_JVMTI
63 class BreakpointInfo;
64 #endif
65 class ClassFileParser;
66 class ClassFileStream;
67 class KlassDepChange;
68 class DependencyContext;
69 class fieldDescriptor;
70 class jniIdMapBase;
71 class JNIid;
72 class JvmtiCachedClassFieldMap;
73 class nmethodBucket;
74 class OopMapCache;
75 class InterpreterOopMap;
76 class PackageEntry;
77 class ModuleEntry;
78
79 // This is used in iterators below.
80 class FieldClosure: public StackObj {
81 public:
82 virtual void do_field(fieldDescriptor* fd) = 0;
83 };
84
85 // Print fields.
86 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields.
87 class FieldPrinter: public FieldClosure {
88 oop _obj;
89 outputStream* _st;
90 public:
91 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {}
92 void do_field(fieldDescriptor* fd);
93 };
94
115 return another_offset == end_offset();
116 }
117
118 // sizeof(OopMapBlock) in words.
119 static int size_in_words() {
120 return align_up((int)sizeof(OopMapBlock), wordSize) >>
121 LogBytesPerWord;
122 }
123
124 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
125 return a->offset() - b->offset();
126 }
127
128 private:
129 int _offset;
130 uint _count;
131 };
132
133 struct JvmtiCachedClassFileData;
134
135 class InstanceKlass: public Klass {
136 friend class VMStructs;
137 friend class JVMCIVMStructs;
138 friend class ClassFileParser;
139 friend class CompileReplay;
140
141 public:
142 static const KlassKind Kind = InstanceKlassKind;
143
144 protected:
145 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE);
146
147 public:
148 InstanceKlass();
149
150 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
151 // of the class loading & initialization procedure, and the use of the states.
152 enum ClassState : u1 {
153 allocated, // allocated (but not yet linked)
154 loaded, // loaded and inserted in class hierarchy (but not linked yet)
155 being_linked, // currently running verifier and rewriter
156 linked, // successfully linked/verified (but not initialized yet)
157 being_initialized, // currently running class initializer
158 fully_initialized, // initialized (successful final state)
159 initialization_error // error happened during initialization
160 };
161
162 private:
163 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
164
165 protected:
166 // If you add a new field that points to any metaspace object, you
167 // must add this field to InstanceKlass::metaspace_pointers_do().
168
169 // Annotations for this class
170 Annotations* _annotations;
171 // Package this class is defined in
172 PackageEntry* _package_entry;
173 // Array classes holding elements of this class.
174 ObjArrayKlass* volatile _array_klasses;
175 // Constant pool for this class.
176 ConstantPool* _constants;
177 // The InnerClasses attribute and EnclosingMethod attribute. The
178 // _inner_classes is an array of shorts. If the class has InnerClasses
179 // attribute, then the _inner_classes array begins with 4-tuples of shorts
180 // [inner_class_info_index, outer_class_info_index,
181 // inner_name_index, inner_class_access_flags] for the InnerClasses
182 // attribute. If the EnclosingMethod attribute exists, it occupies the
183 // last two shorts [class_index, method_index] of the array. If only
184 // the InnerClasses attribute exists, the _inner_classes array length is
185 // number_of_inner_classes * 4. If the class has both InnerClasses
186 // and EnclosingMethod attributes the _inner_classes array length is
187 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
188 Array<jushort>* _inner_classes;
189
190 // The NestMembers attribute. An array of shorts, where each is a
191 // class info index for the class that is a nest member. This data
192 // has not been validated.
193 Array<jushort>* _nest_members;
194
259 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once
260
261 // Method array.
262 Array<Method*>* _methods;
263 // Default Method Array, concrete methods inherited from interfaces
264 Array<Method*>* _default_methods;
265 // Interfaces (InstanceKlass*s) this class declares locally to implement.
266 Array<InstanceKlass*>* _local_interfaces;
267 // Interfaces (InstanceKlass*s) this class implements transitively.
268 Array<InstanceKlass*>* _transitive_interfaces;
269 // Int array containing the original order of method in the class file (for JVMTI).
270 Array<int>* _method_ordering;
271 // Int array containing the vtable_indices for default_methods
272 // offset matches _default_methods offset
273 Array<int>* _default_vtable_indices;
274
275 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp)
276 Array<u1>* _fieldinfo_stream;
277 Array<FieldStatus>* _fields_status;
278
279 // embedded Java vtable follows here
280 // embedded Java itables follows here
281 // embedded static fields follows here
282 // embedded nonstatic oop-map blocks follows here
283 // embedded implementor of this interface follows here
284 // The embedded implementor only exists if the current klass is an
285 // interface. The possible values of the implementor fall into following
286 // three cases:
287 // null: no implementor.
288 // A Klass* that's not itself: one implementor.
289 // Itself: more than one implementors.
290 //
291
292 friend class SystemDictionary;
293
294 static bool _disable_method_binary_search;
295
296 // Controls finalizer registration
297 static bool _finalization_enabled;
298
312 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); }
313
314 // Check if the class can be shared in CDS
315 bool is_shareable() const;
316
317 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); }
318
319 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); }
320
321 #if INCLUDE_CDS
322 void set_shared_class_loader_type(s2 loader_type) { _misc_flags.set_shared_class_loader_type(loader_type); }
323 void assign_class_loader_type() { _misc_flags.assign_class_loader_type(_class_loader_data); }
324 #endif
325
326 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); }
327 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); }
328
329 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); }
330 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); }
331
332 // field sizes
333 int nonstatic_field_size() const { return _nonstatic_field_size; }
334 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
335
336 int static_field_size() const { return _static_field_size; }
337 void set_static_field_size(int size) { _static_field_size = size; }
338
339 int static_oop_field_count() const { return (int)_static_oop_field_count; }
340 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
341
342 // Java itable
343 int itable_length() const { return _itable_len; }
344 void set_itable_length(int len) { _itable_len = len; }
345
346 // array klasses
347 ObjArrayKlass* array_klasses() const { return _array_klasses; }
348 inline ObjArrayKlass* array_klasses_acquire() const; // load with acquire semantics
349 inline void release_set_array_klasses(ObjArrayKlass* k); // store with release semantics
350 void set_array_klasses(ObjArrayKlass* k) { _array_klasses = k; }
351
352 // methods
353 Array<Method*>* methods() const { return _methods; }
354 void set_methods(Array<Method*>* a) { _methods = a; }
355 Method* method_with_idnum(int idnum);
356 Method* method_with_orig_idnum(int idnum);
357 Method* method_with_orig_idnum(int idnum, int version);
358
359 // method ordering
360 Array<int>* method_ordering() const { return _method_ordering; }
361 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
362 void copy_method_ordering(const intArray* m, TRAPS);
363
364 // default_methods
365 Array<Method*>* default_methods() const { return _default_methods; }
366 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
367
368 // default method vtable_indices
369 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
370 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
371 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
372
373 // interfaces
374 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
375 void set_local_interfaces(Array<InstanceKlass*>* a) {
376 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking");
377 _local_interfaces = a; }
378
379 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
380 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
381 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking");
382 _transitive_interfaces = a;
383 }
384
385 private:
386 friend class fieldDescriptor;
387 FieldInfo field(int index) const;
388
389 public:
390 int field_offset (int index) const { return field(index).offset(); }
391 int field_access_flags(int index) const { return field(index).access_flags().as_int(); }
392 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); }
393 FieldStatus field_status(int index) const { return fields_status()->at(index); }
394 inline Symbol* field_name (int index) const;
395 inline Symbol* field_signature (int index) const;
396
397 // Number of Java declared fields
398 int java_fields_count() const;
399 int total_fields_count() const;
400
401 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; }
402 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; }
403
404 Array<FieldStatus>* fields_status() const {return _fields_status; }
405 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; }
406
407 // inner classes
408 Array<u2>* inner_classes() const { return _inner_classes; }
409 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
410
411 // nest members
412 Array<u2>* nest_members() const { return _nest_members; }
413 void set_nest_members(Array<u2>* m) { _nest_members = m; }
414
415 // nest-host index
416 jushort nest_host_index() const { return _nest_host_index; }
417 void set_nest_host_index(u2 i) { _nest_host_index = i; }
418 // dynamic nest member support
419 void set_nest_host(InstanceKlass* host);
420
421 // record components
422 Array<RecordComponent*>* record_components() const { return _record_components; }
423 void set_record_components(Array<RecordComponent*>* record_components) {
424 _record_components = record_components;
425 }
426 bool is_record() const;
526 }
527 ~LockLinkState() {
528 if (!_ik->is_linked()) {
529 // Reset to loaded if linking failed.
530 _ik->set_initialization_state_and_notify(loaded, _current);
531 }
532 }
533 };
534
535 // is this a sealed class
536 bool is_sealed() const;
537
538 // defineClass specified verification
539 bool should_verify_class() const { return _misc_flags.should_verify_class(); }
540 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); }
541
542 // marking
543 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); }
544 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); }
545
546 // initialization (virtuals from Klass)
547 bool should_be_initialized() const; // means that initialize should be called
548 void initialize(TRAPS);
549 void link_class(TRAPS);
550 bool link_class_or_fail(TRAPS); // returns false on failure
551 void rewrite_class(TRAPS);
552 void link_methods(TRAPS);
553 Method* class_initializer() const;
554
555 // reference type
556 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
557
558 // this class cp index
559 u2 this_class_index() const { return _this_class_index; }
560 void set_this_class_index(u2 index) { _this_class_index = index; }
561
562 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); }
563
564 // find local field, returns true if found
565 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
858
859 // On-stack replacement support
860 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
861 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
862 void add_osr_nmethod(nmethod* n);
863 bool remove_osr_nmethod(nmethod* n);
864 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m);
865 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
866
867 #if INCLUDE_JVMTI
868 // Breakpoint support (see methods on Method* for details)
869 BreakpointInfo* breakpoints() const { return _breakpoints; };
870 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
871 #endif
872
873 // support for stub routines
874 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); }
875 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
876 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); }
877
878 // subclass/subinterface checks
879 bool implements_interface(Klass* k) const;
880 bool is_same_or_direct_interface(Klass* k) const;
881
882 #ifdef ASSERT
883 // check whether this class or one of its superclasses was redefined
884 bool has_redefined_this_or_super() const;
885 #endif
886
887 // Access to the implementor of an interface.
888 InstanceKlass* implementor() const;
889 void set_implementor(InstanceKlass* ik);
890 int nof_implementors() const;
891 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
892 void init_implementor(); // initialize
893
894 private:
895 // link this class into the implementors list of every interface it implements
896 void process_interfaces();
897
915
916 static InstanceKlass* cast(Klass* k) {
917 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
918 }
919
920 static const InstanceKlass* cast(const Klass* k) {
921 assert(k != nullptr, "k should not be null");
922 assert(k->is_instance_klass(), "cast to InstanceKlass");
923 return static_cast<const InstanceKlass*>(k);
924 }
925
926 virtual InstanceKlass* java_super() const {
927 return (super() == nullptr) ? nullptr : cast(super());
928 }
929
930 // Sizing (in words)
931 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
932
933 static int size(int vtable_length, int itable_length,
934 int nonstatic_oop_map_size,
935 bool is_interface) {
936 return align_metadata_size(header_size() +
937 vtable_length +
938 itable_length +
939 nonstatic_oop_map_size +
940 (is_interface ? (int)sizeof(Klass*)/wordSize : 0));
941 }
942
943 int size() const { return size(vtable_length(),
944 itable_length(),
945 nonstatic_oop_map_size(),
946 is_interface());
947 }
948
949
950 inline intptr_t* start_of_itable() const;
951 inline intptr_t* end_of_itable() const;
952 inline oop static_field_base_raw();
953
954 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
955 inline Klass** end_of_nonstatic_oop_maps() const;
956
957 inline InstanceKlass* volatile* adr_implementor() const;
958
959 // Use this to return the size of an instance in heap words:
960 int size_helper() const {
961 return layout_helper_to_size_helper(layout_helper());
962 }
963
964 // This bit is initialized in classFileParser.cpp.
965 // It is false under any of the following conditions:
966 // - the class is abstract (including any interface)
967 // - the class has a finalizer (if !RegisterFinalizersAtInit)
968 // - the class size is larger than FastAllocateSizeLimit
969 // - the class is java/lang/Class, which cannot be allocated directly
970 bool can_be_fastpath_allocated() const {
971 return !layout_helper_needs_slow_path(layout_helper());
972 }
973
974 // Java itable
975 klassItable itable() const; // return klassItable wrapper
976 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
977 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
978 int vtable_index_of_interface_method(Method* method);
979
980 #if INCLUDE_JVMTI
992 // instanceKlasses and the metadata they point to.
993 void deallocate_contents(ClassLoaderData* loader_data);
994 static void deallocate_methods(ClassLoaderData* loader_data,
995 Array<Method*>* methods);
996 void static deallocate_interfaces(ClassLoaderData* loader_data,
997 const Klass* super_klass,
998 Array<InstanceKlass*>* local_interfaces,
999 Array<InstanceKlass*>* transitive_interfaces);
1000 void static deallocate_record_components(ClassLoaderData* loader_data,
1001 Array<RecordComponent*>* record_component);
1002
1003 virtual bool on_stack() const;
1004
1005 // callbacks for actions during class unloading
1006 static void unload_class(InstanceKlass* ik);
1007
1008 virtual void release_C_heap_structures(bool release_sub_metadata = true);
1009
1010 // Naming
1011 const char* signature_name() const;
1012
1013 // Oop fields (and metadata) iterators
1014 //
1015 // The InstanceKlass iterators also visits the Object's klass.
1016
1017 // Forward iteration
1018 public:
1019 // Iterate over all oop fields in the oop maps.
1020 template <typename T, class OopClosureType>
1021 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1022
1023 // Iterate over all oop fields and metadata.
1024 template <typename T, class OopClosureType>
1025 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1026
1027 // Iterate over all oop fields in one oop map.
1028 template <typename T, class OopClosureType>
1029 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1030
1031
1117 const Symbol* name,
1118 const Symbol* signature,
1119 OverpassLookupMode overpass_mode,
1120 StaticLookupMode static_mode,
1121 PrivateLookupMode private_mode);
1122
1123 #if INCLUDE_JVMTI
1124 // RedefineClasses support
1125 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1126 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1127 #endif
1128 // log class name to classlist
1129 void log_to_classlist() const;
1130 public:
1131
1132 #if INCLUDE_CDS
1133 // CDS support - remove and restore oops from metadata. Oops are not shared.
1134 virtual void remove_unshareable_info();
1135 void remove_unshareable_flags();
1136 virtual void remove_java_mirror();
1137 void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS);
1138 void init_shared_package_entry();
1139 bool can_be_verified_at_dumptime() const;
1140 bool methods_contain_jsr_bytecode() const;
1141 void compute_has_loops_flag_for_methods();
1142 #endif
1143
1144 jint compute_modifier_flags() const;
1145
1146 public:
1147 // JVMTI support
1148 jint jvmti_class_status() const;
1149
1150 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1151
1152 public:
1153 // Printing
1154 void print_on(outputStream* st) const;
1155 void print_value_on(outputStream* st) const;
1156
1157 void oop_print_value_on(oop obj, outputStream* st);
|
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_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_OOPS_INSTANCEKLASS_HPP
27
28 #include "code/vmreg.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceKlassFlags.hpp"
34 #include "oops/instanceOop.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/javaThread.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/growableArray.hpp"
40 #include "utilities/macros.hpp"
41 #if INCLUDE_JFR
42 #include "jfr/support/jfrKlassExtension.hpp"
43 #endif
44
45 class ConstantPool;
46 class DeoptimizationScope;
47 class klassItable;
48 class Monitor;
49 class RecordComponent;
50
51 // An InstanceKlass is the VM level representation of a Java class.
52 // It contains all information needed for at class at execution runtime.
53
54 // InstanceKlass embedded field layout (after declared fields):
55 // [EMBEDDED Java vtable ] size in words = vtable_len
56 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
57 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
58 // indicating where oops are located in instances of this klass.
59 // [EMBEDDED implementor of the interface] only exist for interface
60 // [EMBEDDED InlineKlassFixedBlock] only if is an InlineKlass instance
61
62
63 // forward declaration for class -- see below for definition
64 #if INCLUDE_JVMTI
65 class BreakpointInfo;
66 #endif
67 class ClassFileParser;
68 class ClassFileStream;
69 class KlassDepChange;
70 class DependencyContext;
71 class fieldDescriptor;
72 class jniIdMapBase;
73 class JNIid;
74 class JvmtiCachedClassFieldMap;
75 class nmethodBucket;
76 class OopMapCache;
77 class BufferedInlineTypeBlob;
78 class InterpreterOopMap;
79 class PackageEntry;
80 class ModuleEntry;
81
82 // This is used in iterators below.
83 class FieldClosure: public StackObj {
84 public:
85 virtual void do_field(fieldDescriptor* fd) = 0;
86 };
87
88 // Print fields.
89 // If "obj" argument to constructor is null, prints static fields, otherwise prints non-static fields.
90 class FieldPrinter: public FieldClosure {
91 oop _obj;
92 outputStream* _st;
93 public:
94 FieldPrinter(outputStream* st, oop obj = nullptr) : _obj(obj), _st(st) {}
95 void do_field(fieldDescriptor* fd);
96 };
97
118 return another_offset == end_offset();
119 }
120
121 // sizeof(OopMapBlock) in words.
122 static int size_in_words() {
123 return align_up((int)sizeof(OopMapBlock), wordSize) >>
124 LogBytesPerWord;
125 }
126
127 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
128 return a->offset() - b->offset();
129 }
130
131 private:
132 int _offset;
133 uint _count;
134 };
135
136 struct JvmtiCachedClassFileData;
137
138 class SigEntry;
139
140 class InlineKlassFixedBlock {
141 Array<SigEntry>** _extended_sig;
142 Array<VMRegPair>** _return_regs;
143 address* _pack_handler;
144 address* _pack_handler_jobject;
145 address* _unpack_handler;
146 int* _default_value_offset;
147 ArrayKlass** _null_free_inline_array_klasses;
148 int _alignment;
149 int _first_field_offset;
150 int _payload_size_in_bytes;
151 int _internal_null_marker_offset; // -1 if none
152
153 friend class InlineKlass;
154 };
155
156 class InstanceKlass: public Klass {
157 friend class VMStructs;
158 friend class JVMCIVMStructs;
159 friend class ClassFileParser;
160 friend class CompileReplay;
161 friend class TemplateTable;
162
163 public:
164 static const KlassKind Kind = InstanceKlassKind;
165
166 protected:
167 InstanceKlass(const ClassFileParser& parser, KlassKind kind = Kind, ReferenceType reference_type = REF_NONE);
168
169 public:
170 InstanceKlass();
171
172 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
173 // of the class loading & initialization procedure, and the use of the states.
174 enum ClassState : u1 {
175 allocated, // allocated (but not yet linked)
176 loaded, // loaded and inserted in class hierarchy (but not linked yet)
177 being_linked, // currently running verifier and rewriter
178 linked, // successfully linked/verified (but not initialized yet)
179 being_initialized, // currently running class initializer
180 fully_initialized, // initialized (successful final state)
181 initialization_error // error happened during initialization
182 };
183
184 private:
185 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
186
187 protected:
188 // If you add a new field that points to any metaspace object, you
189 // must add this field to InstanceKlass::metaspace_pointers_do().
190
191 // Annotations for this class
192 Annotations* _annotations;
193 // Package this class is defined in
194 PackageEntry* _package_entry;
195 // Array classes holding elements of this class.
196 ArrayKlass* volatile _array_klasses;
197 // Constant pool for this class.
198 ConstantPool* _constants;
199 // The InnerClasses attribute and EnclosingMethod attribute. The
200 // _inner_classes is an array of shorts. If the class has InnerClasses
201 // attribute, then the _inner_classes array begins with 4-tuples of shorts
202 // [inner_class_info_index, outer_class_info_index,
203 // inner_name_index, inner_class_access_flags] for the InnerClasses
204 // attribute. If the EnclosingMethod attribute exists, it occupies the
205 // last two shorts [class_index, method_index] of the array. If only
206 // the InnerClasses attribute exists, the _inner_classes array length is
207 // number_of_inner_classes * 4. If the class has both InnerClasses
208 // and EnclosingMethod attributes the _inner_classes array length is
209 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
210 Array<jushort>* _inner_classes;
211
212 // The NestMembers attribute. An array of shorts, where each is a
213 // class info index for the class that is a nest member. This data
214 // has not been validated.
215 Array<jushort>* _nest_members;
216
281 NOT_PRODUCT(volatile int _shared_class_load_count;) // ensure a shared class is loaded only once
282
283 // Method array.
284 Array<Method*>* _methods;
285 // Default Method Array, concrete methods inherited from interfaces
286 Array<Method*>* _default_methods;
287 // Interfaces (InstanceKlass*s) this class declares locally to implement.
288 Array<InstanceKlass*>* _local_interfaces;
289 // Interfaces (InstanceKlass*s) this class implements transitively.
290 Array<InstanceKlass*>* _transitive_interfaces;
291 // Int array containing the original order of method in the class file (for JVMTI).
292 Array<int>* _method_ordering;
293 // Int array containing the vtable_indices for default_methods
294 // offset matches _default_methods offset
295 Array<int>* _default_vtable_indices;
296
297 // Fields information is stored in an UNSIGNED5 encoded stream (see fieldInfo.hpp)
298 Array<u1>* _fieldinfo_stream;
299 Array<FieldStatus>* _fields_status;
300
301 Array<InlineKlass*>* _inline_type_field_klasses; // For "inline class" fields, null if none present
302 Array<int>* _null_marker_offsets; // for flat fields with a null marker
303 Array<u2>* _loadable_descriptors;
304 const InlineKlassFixedBlock* _adr_inlineklass_fixed_block;
305
306 // embedded Java vtable follows here
307 // embedded Java itables follows here
308 // embedded static fields follows here
309 // embedded nonstatic oop-map blocks follows here
310 // embedded implementor of this interface follows here
311 // The embedded implementor only exists if the current klass is an
312 // interface. The possible values of the implementor fall into following
313 // three cases:
314 // null: no implementor.
315 // A Klass* that's not itself: one implementor.
316 // Itself: more than one implementors.
317 //
318
319 friend class SystemDictionary;
320
321 static bool _disable_method_binary_search;
322
323 // Controls finalizer registration
324 static bool _finalization_enabled;
325
339 bool is_shared_unregistered_class() const { return _misc_flags.is_shared_unregistered_class(); }
340
341 // Check if the class can be shared in CDS
342 bool is_shareable() const;
343
344 bool shared_loading_failed() const { return _misc_flags.shared_loading_failed(); }
345
346 void set_shared_loading_failed() { _misc_flags.set_shared_loading_failed(true); }
347
348 #if INCLUDE_CDS
349 void set_shared_class_loader_type(s2 loader_type) { _misc_flags.set_shared_class_loader_type(loader_type); }
350 void assign_class_loader_type() { _misc_flags.assign_class_loader_type(_class_loader_data); }
351 #endif
352
353 bool has_nonstatic_fields() const { return _misc_flags.has_nonstatic_fields(); }
354 void set_has_nonstatic_fields(bool b) { _misc_flags.set_has_nonstatic_fields(b); }
355
356 bool has_localvariable_table() const { return _misc_flags.has_localvariable_table(); }
357 void set_has_localvariable_table(bool b) { _misc_flags.set_has_localvariable_table(b); }
358
359 bool has_inline_type_fields() const { return _misc_flags.has_inline_type_fields(); }
360 void set_has_inline_type_fields() { _misc_flags.set_has_inline_type_fields(true); }
361
362 bool is_empty_inline_type() const { return _misc_flags.is_empty_inline_type(); }
363 void set_is_empty_inline_type() { _misc_flags.set_is_empty_inline_type(true); }
364
365 // Note: The naturally_atomic property only applies to
366 // inline classes; it is never true on identity classes.
367 // The bit is placed on instanceKlass for convenience.
368
369 // Query if h/w provides atomic load/store for instances.
370 bool is_naturally_atomic() const { return _misc_flags.is_naturally_atomic(); }
371 void set_is_naturally_atomic() { _misc_flags.set_is_naturally_atomic(true); }
372
373 // Query if this class is mentioned in the JVM option ForceNonTearable.
374 // This bit can occur anywhere, but is only significant
375 // for inline classes *and* their super types.
376 // It inherits from supers.
377 bool must_be_atomic() const { return _misc_flags.must_be_atomic(); }
378 void set_must_be_atomic() { _misc_flags.set_must_be_atomic(true); }
379
380 bool is_implicitly_constructible() const { return _misc_flags.is_implicitly_constructible(); }
381 void set_is_implicitly_constructible() { _misc_flags.set_is_implicitly_constructible(true); }
382
383 // field sizes
384 int nonstatic_field_size() const { return _nonstatic_field_size; }
385 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
386
387 int static_field_size() const { return _static_field_size; }
388 void set_static_field_size(int size) { _static_field_size = size; }
389
390 int static_oop_field_count() const { return (int)_static_oop_field_count; }
391 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
392
393 // Java itable
394 int itable_length() const { return _itable_len; }
395 void set_itable_length(int len) { _itable_len = len; }
396
397 // array klasses
398 ArrayKlass* array_klasses() const { return _array_klasses; }
399 inline ArrayKlass* array_klasses_acquire() const; // load with acquire semantics
400 inline void release_set_array_klasses(ArrayKlass* k); // store with release semantics
401 void set_array_klasses(ArrayKlass* k) { _array_klasses = k; }
402
403 // methods
404 Array<Method*>* methods() const { return _methods; }
405 void set_methods(Array<Method*>* a) { _methods = a; }
406 Method* method_with_idnum(int idnum);
407 Method* method_with_orig_idnum(int idnum);
408 Method* method_with_orig_idnum(int idnum, int version);
409
410 // method ordering
411 Array<int>* method_ordering() const { return _method_ordering; }
412 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
413 void copy_method_ordering(const intArray* m, TRAPS);
414
415 // default_methods
416 Array<Method*>* default_methods() const { return _default_methods; }
417 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
418
419 // default method vtable_indices
420 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
421 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
422 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
423
424 // interfaces
425 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
426 void set_local_interfaces(Array<InstanceKlass*>* a) {
427 guarantee(_local_interfaces == nullptr || a == nullptr, "Just checking");
428 _local_interfaces = a; }
429
430 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
431 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
432 guarantee(_transitive_interfaces == nullptr || a == nullptr, "Just checking");
433 _transitive_interfaces = a;
434 }
435
436 private:
437 friend class fieldDescriptor;
438 FieldInfo field(int index) const;
439
440 public:
441 int field_offset (int index) const { return field(index).offset(); }
442 int field_access_flags(int index) const { return field(index).access_flags().as_int(); }
443 FieldInfo::FieldFlags field_flags(int index) const { return field(index).field_flags(); }
444 FieldStatus field_status(int index) const { return fields_status()->at(index); }
445 inline Symbol* field_name (int index) const;
446 inline Symbol* field_signature (int index) const;
447 bool field_is_flat(int index) const { return field_flags(index).is_flat(); }
448 bool field_has_null_marker(int index) const { return field_flags(index).has_null_marker(); }
449 bool field_is_null_free_inline_type(int index) const;
450 bool is_class_in_loadable_descriptors_attribute(Symbol* name) const;
451
452 // Number of Java declared fields
453 int java_fields_count() const;
454 int total_fields_count() const;
455
456 Array<u1>* fieldinfo_stream() const { return _fieldinfo_stream; }
457 void set_fieldinfo_stream(Array<u1>* fis) { _fieldinfo_stream = fis; }
458
459 Array<FieldStatus>* fields_status() const {return _fields_status; }
460 void set_fields_status(Array<FieldStatus>* array) { _fields_status = array; }
461
462 Array<u2>* loadable_descriptors() const { return _loadable_descriptors; }
463 void set_loadable_descriptors(Array<u2>* c) { _loadable_descriptors = c; }
464
465 // inner classes
466 Array<u2>* inner_classes() const { return _inner_classes; }
467 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
468
469 // nest members
470 Array<u2>* nest_members() const { return _nest_members; }
471 void set_nest_members(Array<u2>* m) { _nest_members = m; }
472
473 // nest-host index
474 jushort nest_host_index() const { return _nest_host_index; }
475 void set_nest_host_index(u2 i) { _nest_host_index = i; }
476 // dynamic nest member support
477 void set_nest_host(InstanceKlass* host);
478
479 // record components
480 Array<RecordComponent*>* record_components() const { return _record_components; }
481 void set_record_components(Array<RecordComponent*>* record_components) {
482 _record_components = record_components;
483 }
484 bool is_record() const;
584 }
585 ~LockLinkState() {
586 if (!_ik->is_linked()) {
587 // Reset to loaded if linking failed.
588 _ik->set_initialization_state_and_notify(loaded, _current);
589 }
590 }
591 };
592
593 // is this a sealed class
594 bool is_sealed() const;
595
596 // defineClass specified verification
597 bool should_verify_class() const { return _misc_flags.should_verify_class(); }
598 void set_should_verify_class(bool value) { _misc_flags.set_should_verify_class(value); }
599
600 // marking
601 bool is_marked_dependent() const { return _misc_flags.is_marked_dependent(); }
602 void set_is_marked_dependent(bool value) { _misc_flags.set_is_marked_dependent(value); }
603
604 static ByteSize kind_offset() { return in_ByteSize(offset_of(InstanceKlass, _kind)); }
605 static ByteSize misc_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _misc_flags)); }
606
607 // initialization (virtuals from Klass)
608 bool should_be_initialized() const; // means that initialize should be called
609 void initialize(TRAPS);
610 void link_class(TRAPS);
611 bool link_class_or_fail(TRAPS); // returns false on failure
612 void rewrite_class(TRAPS);
613 void link_methods(TRAPS);
614 Method* class_initializer() const;
615
616 // reference type
617 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
618
619 // this class cp index
620 u2 this_class_index() const { return _this_class_index; }
621 void set_this_class_index(u2 index) { _this_class_index = index; }
622
623 static ByteSize reference_type_offset() { return byte_offset_of(InstanceKlass, _reference_type); }
624
625 // find local field, returns true if found
626 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
919
920 // On-stack replacement support
921 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
922 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
923 void add_osr_nmethod(nmethod* n);
924 bool remove_osr_nmethod(nmethod* n);
925 int mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m);
926 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
927
928 #if INCLUDE_JVMTI
929 // Breakpoint support (see methods on Method* for details)
930 BreakpointInfo* breakpoints() const { return _breakpoints; };
931 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
932 #endif
933
934 // support for stub routines
935 static ByteSize init_state_offset() { return byte_offset_of(InstanceKlass, _init_state); }
936 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
937 static ByteSize init_thread_offset() { return byte_offset_of(InstanceKlass, _init_thread); }
938
939 static ByteSize inline_type_field_klasses_offset() { return in_ByteSize(offset_of(InstanceKlass, _inline_type_field_klasses)); }
940 static ByteSize null_marker_array_offset() { return in_ByteSize(offset_of(InstanceKlass, _null_marker_offsets)); }
941 static ByteSize adr_inlineklass_fixed_block_offset() { return in_ByteSize(offset_of(InstanceKlass, _adr_inlineklass_fixed_block)); }
942
943 // subclass/subinterface checks
944 bool implements_interface(Klass* k) const;
945 bool is_same_or_direct_interface(Klass* k) const;
946
947 #ifdef ASSERT
948 // check whether this class or one of its superclasses was redefined
949 bool has_redefined_this_or_super() const;
950 #endif
951
952 // Access to the implementor of an interface.
953 InstanceKlass* implementor() const;
954 void set_implementor(InstanceKlass* ik);
955 int nof_implementors() const;
956 void add_implementor(InstanceKlass* ik); // ik is a new class that implements this interface
957 void init_implementor(); // initialize
958
959 private:
960 // link this class into the implementors list of every interface it implements
961 void process_interfaces();
962
980
981 static InstanceKlass* cast(Klass* k) {
982 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
983 }
984
985 static const InstanceKlass* cast(const Klass* k) {
986 assert(k != nullptr, "k should not be null");
987 assert(k->is_instance_klass(), "cast to InstanceKlass");
988 return static_cast<const InstanceKlass*>(k);
989 }
990
991 virtual InstanceKlass* java_super() const {
992 return (super() == nullptr) ? nullptr : cast(super());
993 }
994
995 // Sizing (in words)
996 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
997
998 static int size(int vtable_length, int itable_length,
999 int nonstatic_oop_map_size,
1000 bool is_interface,
1001 bool is_inline_type) {
1002 return align_metadata_size(header_size() +
1003 vtable_length +
1004 itable_length +
1005 nonstatic_oop_map_size +
1006 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1007 (is_inline_type ? (int)sizeof(InlineKlassFixedBlock) : 0));
1008 }
1009
1010 int size() const { return size(vtable_length(),
1011 itable_length(),
1012 nonstatic_oop_map_size(),
1013 is_interface(),
1014 is_inline_klass());
1015 }
1016
1017
1018 inline intptr_t* start_of_itable() const;
1019 inline intptr_t* end_of_itable() const;
1020 inline oop static_field_base_raw();
1021 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1022
1023 inline OopMapBlock* start_of_nonstatic_oop_maps() const;
1024 inline Klass** end_of_nonstatic_oop_maps() const;
1025
1026 inline InstanceKlass* volatile* adr_implementor() const;
1027
1028 Array<InlineKlass*>* inline_type_field_klasses_array() const { return _inline_type_field_klasses; }
1029 void set_inline_type_field_klasses_array(Array<InlineKlass*>* array) { _inline_type_field_klasses = array; }
1030
1031 Array<int>* null_marker_offsets_array() const { return _null_marker_offsets; }
1032 void set_null_marker_offsets_array(Array<int>* array) { _null_marker_offsets = array; }
1033
1034 inline InlineKlass* get_inline_type_field_klass(int idx) const;
1035 inline InlineKlass* get_inline_type_field_klass_or_null(int idx) const;
1036 inline void set_inline_type_field_klass(int idx, InlineKlass* k);
1037 inline void reset_inline_type_field_klass(int idx);
1038
1039 // Use this to return the size of an instance in heap words:
1040 virtual int size_helper() const {
1041 return layout_helper_to_size_helper(layout_helper());
1042 }
1043
1044 // This bit is initialized in classFileParser.cpp.
1045 // It is false under any of the following conditions:
1046 // - the class is abstract (including any interface)
1047 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1048 // - the class size is larger than FastAllocateSizeLimit
1049 // - the class is java/lang/Class, which cannot be allocated directly
1050 bool can_be_fastpath_allocated() const {
1051 return !layout_helper_needs_slow_path(layout_helper());
1052 }
1053
1054 // Java itable
1055 klassItable itable() const; // return klassItable wrapper
1056 Method* method_at_itable(InstanceKlass* holder, int index, TRAPS);
1057 Method* method_at_itable_or_null(InstanceKlass* holder, int index, bool& itable_entry_found);
1058 int vtable_index_of_interface_method(Method* method);
1059
1060 #if INCLUDE_JVMTI
1072 // instanceKlasses and the metadata they point to.
1073 void deallocate_contents(ClassLoaderData* loader_data);
1074 static void deallocate_methods(ClassLoaderData* loader_data,
1075 Array<Method*>* methods);
1076 void static deallocate_interfaces(ClassLoaderData* loader_data,
1077 const Klass* super_klass,
1078 Array<InstanceKlass*>* local_interfaces,
1079 Array<InstanceKlass*>* transitive_interfaces);
1080 void static deallocate_record_components(ClassLoaderData* loader_data,
1081 Array<RecordComponent*>* record_component);
1082
1083 virtual bool on_stack() const;
1084
1085 // callbacks for actions during class unloading
1086 static void unload_class(InstanceKlass* ik);
1087
1088 virtual void release_C_heap_structures(bool release_sub_metadata = true);
1089
1090 // Naming
1091 const char* signature_name() const;
1092 const char* signature_name_of_carrier(char c) const;
1093
1094 // Oop fields (and metadata) iterators
1095 //
1096 // The InstanceKlass iterators also visits the Object's klass.
1097
1098 // Forward iteration
1099 public:
1100 // Iterate over all oop fields in the oop maps.
1101 template <typename T, class OopClosureType>
1102 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1103
1104 // Iterate over all oop fields and metadata.
1105 template <typename T, class OopClosureType>
1106 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1107
1108 // Iterate over all oop fields in one oop map.
1109 template <typename T, class OopClosureType>
1110 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1111
1112
1198 const Symbol* name,
1199 const Symbol* signature,
1200 OverpassLookupMode overpass_mode,
1201 StaticLookupMode static_mode,
1202 PrivateLookupMode private_mode);
1203
1204 #if INCLUDE_JVMTI
1205 // RedefineClasses support
1206 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1207 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1208 #endif
1209 // log class name to classlist
1210 void log_to_classlist() const;
1211 public:
1212
1213 #if INCLUDE_CDS
1214 // CDS support - remove and restore oops from metadata. Oops are not shared.
1215 virtual void remove_unshareable_info();
1216 void remove_unshareable_flags();
1217 virtual void remove_java_mirror();
1218 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, PackageEntry* pkg_entry, TRAPS);
1219 void init_shared_package_entry();
1220 bool can_be_verified_at_dumptime() const;
1221 bool methods_contain_jsr_bytecode() const;
1222 void compute_has_loops_flag_for_methods();
1223 #endif
1224
1225 jint compute_modifier_flags() const;
1226
1227 public:
1228 // JVMTI support
1229 jint jvmti_class_status() const;
1230
1231 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1232
1233 public:
1234 // Printing
1235 void print_on(outputStream* st) const;
1236 void print_value_on(outputStream* st) const;
1237
1238 void oop_print_value_on(oop obj, outputStream* st);
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