253 tty->print_cr("Error: find_field called on a klass oop."
254 " Likely error: reflection method does not correctly"
255 " wrap return value in a mirror object.");
256 #endif
257 ShouldNotReachHere();
258 return nullptr;
259 }
260
261 Method* Klass::uncached_lookup_method(const Symbol* name, const Symbol* signature,
262 OverpassLookupMode overpass_mode,
263 PrivateLookupMode private_mode) const {
264 #ifdef ASSERT
265 tty->print_cr("Error: uncached_lookup_method called on a klass oop."
266 " Likely error: reflection method does not correctly"
267 " wrap return value in a mirror object.");
268 #endif
269 ShouldNotReachHere();
270 return nullptr;
271 }
272
273 static markWord make_prototype(const Klass* kls) {
274 markWord prototype = markWord::prototype();
275 #ifdef _LP64
276 if (UseCompactObjectHeaders) {
277 // With compact object headers, the narrow Klass ID is part of the mark word.
278 // We therefore seed the mark word with the narrow Klass ID.
279 precond(CompressedKlassPointers::is_encodable(kls));
280 const narrowKlass nk = CompressedKlassPointers::encode(const_cast<Klass*>(kls));
281 prototype = prototype.set_narrow_klass(nk);
282 }
283 #endif
284 return prototype;
285 }
286
287 void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() {
288 return Metaspace::allocate(loader_data, word_size, MetaspaceObj::ClassType, THREAD);
289 }
290
291 Klass::Klass() : _kind(UnknownKlassKind) {
292 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for cds");
293 }
294
295 // "Normal" instantiation is preceded by a MetaspaceObj allocation
296 // which zeros out memory - calloc equivalent.
297 // The constructor is also used from CppVtableCloner,
298 // which doesn't zero out the memory before calling the constructor.
299 Klass::Klass(KlassKind kind) : _kind(kind),
300 _prototype_header(make_prototype(this)),
301 _shared_class_path_index(-1) {
302 CDS_ONLY(_aot_class_flags = 0;)
303 CDS_JAVA_HEAP_ONLY(_archived_mirror_index = -1;)
304 _primary_supers[0] = this;
305 set_super_check_offset(in_bytes(primary_supers_offset()));
306 }
307
308 jint Klass::array_layout_helper(BasicType etype) {
309 assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype");
310 // Note that T_ARRAY is not allowed here.
311 int hsize = arrayOopDesc::base_offset_in_bytes(etype);
312 int esize = type2aelembytes(etype);
313 bool isobj = (etype == T_OBJECT);
314 int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value;
315 int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize));
316
317 assert(lh < (int)_lh_neutral_value, "must look like an array layout");
318 assert(layout_helper_is_array(lh), "correct kind");
319 assert(layout_helper_is_objArray(lh) == isobj, "correct kind");
320 assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind");
321 assert(layout_helper_header_size(lh) == hsize, "correct decode");
322 assert(layout_helper_element_type(lh) == etype, "correct decode");
323 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
324
325 return lh;
326 }
327
328 int Klass::modifier_flags() const {
329 int mods = java_lang_Class::modifiers(java_mirror());
330 assert(mods == compute_modifier_flags(), "should be same");
331 return mods;
332 }
333
334 bool Klass::can_be_primary_super_slow() const {
335 if (super() == nullptr)
336 return true;
337 else if (super()->super_depth() >= primary_super_limit()-1)
338 return false;
339 else
1012 void Klass::print_on(outputStream* st) const {
1013 ResourceMark rm;
1014 // print title
1015 st->print("%s", internal_name());
1016 print_address_on(st);
1017 st->cr();
1018 }
1019
1020 #define BULLET " - "
1021
1022 // Caller needs ResourceMark
1023 void Klass::oop_print_on(oop obj, outputStream* st) {
1024 // print title
1025 st->print_cr("%s ", internal_name());
1026 obj->print_address_on(st);
1027
1028 if (WizardMode) {
1029 // print header
1030 obj->mark().print_on(st);
1031 st->cr();
1032 if (UseCompactObjectHeaders) {
1033 st->print(BULLET"prototype_header: " INTPTR_FORMAT, _prototype_header.value());
1034 st->cr();
1035 }
1036 }
1037
1038 // print class
1039 st->print(BULLET"klass: ");
1040 obj->klass()->print_value_on(st);
1041 st->print(BULLET"flags: "); _misc_flags.print_on(st); st->cr();
1042 st->cr();
1043 }
1044
1045 void Klass::oop_print_value_on(oop obj, outputStream* st) {
1046 // print title
1047 ResourceMark rm; // Cannot print in debug mode without this
1048 st->print("%s", internal_name());
1049 obj->print_address_on(st);
1050 }
1051
1052 // Verification
1053
1054 void Klass::verify_on(outputStream* st) {
1055
1067 Klass* ko = secondary_super_cache();
1068 guarantee(ko->is_klass(), "should be klass");
1069 }
1070 for ( uint i = 0; i < primary_super_limit(); i++ ) {
1071 Klass* ko = _primary_supers[i];
1072 if (ko != nullptr) {
1073 guarantee(ko->is_klass(), "should be klass");
1074 }
1075 }
1076
1077 if (java_mirror_no_keepalive() != nullptr) {
1078 guarantee(java_lang_Class::is_instance(java_mirror_no_keepalive()), "should be instance");
1079 }
1080 }
1081
1082 void Klass::oop_verify_on(oop obj, outputStream* st) {
1083 guarantee(oopDesc::is_oop(obj), "should be oop");
1084 guarantee(obj->klass()->is_klass(), "klass field is not a klass");
1085 }
1086
1087 // Note: this function is called with an address that may or may not be a Klass.
1088 // The point is not to assert it is but to check if it could be.
1089 bool Klass::is_valid(Klass* k) {
1090 if (!is_aligned(k, sizeof(MetaWord))) return false;
1091 if ((size_t)k < os::min_page_size()) return false;
1092
1093 if (!os::is_readable_range(k, k + 1)) return false;
1094 if (!Metaspace::contains(k)) return false;
1095
1096 if (!Symbol::is_valid(k->name())) return false;
1097 return ClassLoaderDataGraph::is_valid(k->class_loader_data());
1098 }
1099
1100 Method* Klass::method_at_vtable(int index) {
1101 #ifndef PRODUCT
1102 assert(index >= 0, "valid vtable index");
1103 if (DebugVtables) {
1104 verify_vtable_index(index);
1105 }
1106 #endif
|
253 tty->print_cr("Error: find_field called on a klass oop."
254 " Likely error: reflection method does not correctly"
255 " wrap return value in a mirror object.");
256 #endif
257 ShouldNotReachHere();
258 return nullptr;
259 }
260
261 Method* Klass::uncached_lookup_method(const Symbol* name, const Symbol* signature,
262 OverpassLookupMode overpass_mode,
263 PrivateLookupMode private_mode) const {
264 #ifdef ASSERT
265 tty->print_cr("Error: uncached_lookup_method called on a klass oop."
266 " Likely error: reflection method does not correctly"
267 " wrap return value in a mirror object.");
268 #endif
269 ShouldNotReachHere();
270 return nullptr;
271 }
272
273 void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() {
274 return Metaspace::allocate(loader_data, word_size, MetaspaceObj::ClassType, THREAD);
275 }
276
277 Klass::Klass() : _kind(UnknownKlassKind) {
278 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for cds");
279 }
280
281 // "Normal" instantiation is preceded by a MetaspaceObj allocation
282 // which zeros out memory - calloc equivalent.
283 // The constructor is also used from CppVtableCloner,
284 // which doesn't zero out the memory before calling the constructor.
285 Klass::Klass(KlassKind kind, markWord prototype_header) : _kind(kind),
286 _shared_class_path_index(-1) {
287 set_prototype_header(make_prototype_header(this, prototype_header));
288 CDS_ONLY(_aot_class_flags = 0;)
289 CDS_JAVA_HEAP_ONLY(_archived_mirror_index = -1;)
290 _primary_supers[0] = this;
291 set_super_check_offset(in_bytes(primary_supers_offset()));
292 }
293
294 jint Klass::array_layout_helper(BasicType etype) {
295 assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype");
296 // Note that T_ARRAY is not allowed here.
297 int hsize = arrayOopDesc::base_offset_in_bytes(etype);
298 int esize = type2aelembytes(etype);
299 bool isobj = (etype == T_OBJECT);
300 int tag = isobj ? _lh_array_tag_ref_value : _lh_array_tag_type_value;
301 int lh = array_layout_helper(tag, false, hsize, etype, exact_log2(esize));
302
303 assert(lh < (int)_lh_neutral_value, "must look like an array layout");
304 assert(layout_helper_is_array(lh), "correct kind");
305 assert(layout_helper_is_refArray(lh) == isobj, "correct kind");
306 assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind");
307 assert(layout_helper_header_size(lh) == hsize, "correct decode");
308 assert(layout_helper_element_type(lh) == etype, "correct decode");
309 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
310
311 return lh;
312 }
313
314 int Klass::modifier_flags() const {
315 int mods = java_lang_Class::modifiers(java_mirror());
316 assert(mods == compute_modifier_flags(), "should be same");
317 return mods;
318 }
319
320 bool Klass::can_be_primary_super_slow() const {
321 if (super() == nullptr)
322 return true;
323 else if (super()->super_depth() >= primary_super_limit()-1)
324 return false;
325 else
998 void Klass::print_on(outputStream* st) const {
999 ResourceMark rm;
1000 // print title
1001 st->print("%s", internal_name());
1002 print_address_on(st);
1003 st->cr();
1004 }
1005
1006 #define BULLET " - "
1007
1008 // Caller needs ResourceMark
1009 void Klass::oop_print_on(oop obj, outputStream* st) {
1010 // print title
1011 st->print_cr("%s ", internal_name());
1012 obj->print_address_on(st);
1013
1014 if (WizardMode) {
1015 // print header
1016 obj->mark().print_on(st);
1017 st->cr();
1018 st->print(BULLET"prototype_header: " INTPTR_FORMAT, _prototype_header.value());
1019 st->cr();
1020 }
1021
1022 // print class
1023 st->print(BULLET"klass: ");
1024 obj->klass()->print_value_on(st);
1025 st->print(BULLET"flags: "); _misc_flags.print_on(st); st->cr();
1026 st->cr();
1027 }
1028
1029 void Klass::oop_print_value_on(oop obj, outputStream* st) {
1030 // print title
1031 ResourceMark rm; // Cannot print in debug mode without this
1032 st->print("%s", internal_name());
1033 obj->print_address_on(st);
1034 }
1035
1036 // Verification
1037
1038 void Klass::verify_on(outputStream* st) {
1039
1051 Klass* ko = secondary_super_cache();
1052 guarantee(ko->is_klass(), "should be klass");
1053 }
1054 for ( uint i = 0; i < primary_super_limit(); i++ ) {
1055 Klass* ko = _primary_supers[i];
1056 if (ko != nullptr) {
1057 guarantee(ko->is_klass(), "should be klass");
1058 }
1059 }
1060
1061 if (java_mirror_no_keepalive() != nullptr) {
1062 guarantee(java_lang_Class::is_instance(java_mirror_no_keepalive()), "should be instance");
1063 }
1064 }
1065
1066 void Klass::oop_verify_on(oop obj, outputStream* st) {
1067 guarantee(oopDesc::is_oop(obj), "should be oop");
1068 guarantee(obj->klass()->is_klass(), "klass field is not a klass");
1069 }
1070
1071 #ifdef ASSERT
1072 void Klass::validate_array_description(const ArrayDescription& ad) {
1073 if (is_identity_class() || is_array_klass() || is_interface() ||
1074 (is_instance_klass() && InstanceKlass::cast(this)->access_flags().is_abstract())) {
1075 assert(ad._layout_kind == LayoutKind::REFERENCE, "Cannot support flattening");
1076 assert(ad._kind == KlassKind::RefArrayKlassKind, "Must be a reference array");
1077 } else {
1078 assert(is_inline_klass(), "Must be");
1079 InlineKlass* ik = InlineKlass::cast(this);
1080 switch(ad._layout_kind) {
1081 case LayoutKind::BUFFERED:
1082 fatal("Invalid layout for an array");
1083 break;
1084 case LayoutKind::NULL_FREE_ATOMIC_FLAT:
1085 assert(ik->has_null_free_atomic_layout(), "Sanity check");
1086 break;
1087 case LayoutKind::NULL_FREE_NON_ATOMIC_FLAT:
1088 assert(ik->has_null_free_non_atomic_layout(), "Sanity check");
1089 break;
1090 case LayoutKind::NULLABLE_ATOMIC_FLAT:
1091 assert(ik->has_nullable_atomic_layout(), "Sanity check");
1092 break;
1093 case LayoutKind::NULLABLE_NON_ATOMIC_FLAT:
1094 assert(ik->has_nullable_non_atomic_layout(), "Sanity check)");
1095 break;
1096 case LayoutKind::REFERENCE:
1097 break;
1098 default:
1099 ShouldNotReachHere();
1100 }
1101 }
1102 }
1103 #endif // ASSERT
1104
1105 // Note: this function is called with an address that may or may not be a Klass.
1106 // The point is not to assert it is but to check if it could be.
1107 bool Klass::is_valid(Klass* k) {
1108 if (!is_aligned(k, sizeof(MetaWord))) return false;
1109 if ((size_t)k < os::min_page_size()) return false;
1110
1111 if (!os::is_readable_range(k, k + 1)) return false;
1112 if (!Metaspace::contains(k)) return false;
1113
1114 if (!Symbol::is_valid(k->name())) return false;
1115 return ClassLoaderDataGraph::is_valid(k->class_loader_data());
1116 }
1117
1118 Method* Klass::method_at_vtable(int index) {
1119 #ifndef PRODUCT
1120 assert(index >= 0, "valid vtable index");
1121 if (DebugVtables) {
1122 verify_vtable_index(index);
1123 }
1124 #endif
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