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 #include "cds/cdsConfig.hpp"
25 #include "classfile/classFileParser.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoadInfo.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/fieldLayoutBuilder.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldInfo.hpp"
52 #include "oops/fieldStreams.inline.hpp"
53 #include "oops/instanceKlass.inline.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/klassVtable.hpp"
57 #include "oops/metadata.hpp"
58 #include "oops/method.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/recordComponent.hpp"
61 #include "oops/symbol.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/jvmtiThreadState.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/fieldDescriptor.inline.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/os.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/reflection.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/signature.hpp"
73 #include "runtime/timer.hpp"
74 #include "services/classLoadingService.hpp"
75 #include "services/threadService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/bitMap.inline.hpp"
78 #include "utilities/checkedCast.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/exceptions.hpp"
81 #include "utilities/formatBuffer.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/growableArray.hpp"
84 #include "utilities/hashTable.hpp"
85 #include "utilities/macros.hpp"
86 #include "utilities/ostream.hpp"
87 #include "utilities/utf8.hpp"
88 #if INCLUDE_CDS
89 #include "classfile/systemDictionaryShared.hpp"
90 #endif
91 #if INCLUDE_JFR
92 #include "jfr/support/jfrTraceIdExtension.hpp"
93 #endif
94
95 // We generally try to create the oops directly when parsing, rather than
96 // allocating temporary data structures and copying the bytes twice. A
97 // temporary area is only needed when parsing utf8 entries in the constant
98 // pool and when parsing line number tables.
99
100 // We add assert in debug mode when class format is not checked.
101
102 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
103 #define JAVA_MIN_SUPPORTED_VERSION 45
104 #define JAVA_PREVIEW_MINOR_VERSION 65535
105
106 // Used for two backward compatibility reasons:
139 #define JAVA_17_VERSION 61
140
141 #define JAVA_18_VERSION 62
142
143 #define JAVA_19_VERSION 63
144
145 #define JAVA_20_VERSION 64
146
147 #define JAVA_21_VERSION 65
148
149 #define JAVA_22_VERSION 66
150
151 #define JAVA_23_VERSION 67
152
153 #define JAVA_24_VERSION 68
154
155 #define JAVA_25_VERSION 69
156
157 #define JAVA_26_VERSION 70
158
159 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
160 assert((bad_constant == JVM_CONSTANT_Module ||
161 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
162 "Unexpected bad constant pool entry");
163 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
164 }
165
166 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
167 ConstantPool* cp,
168 const int length,
169 TRAPS) {
170 assert(stream != nullptr, "invariant");
171 assert(cp != nullptr, "invariant");
172
173 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
174 // this function (_current can be allocated in a register, with scalar
175 // replacement of aggregates). The _current pointer is copied back to
176 // stream() when this function returns. DON'T call another method within
177 // this method that uses stream().
178 const ClassFileStream cfs1 = *stream;
179 const ClassFileStream* const cfs = &cfs1;
180
181 DEBUG_ONLY(const u1* const old_current = stream->current();)
182
183 // Used for batching symbol allocations.
184 const char* names[SymbolTable::symbol_alloc_batch_size];
185 int lengths[SymbolTable::symbol_alloc_batch_size];
186 int indices[SymbolTable::symbol_alloc_batch_size];
187 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
188 int names_count = 0;
189
190 // parsing Index 0 is unused
191 for (int index = 1; index < length; index++) {
192 // Each of the following case guarantees one more byte in the stream
193 // for the following tag or the access_flags following constant pool,
194 // so we don't need bounds-check for reading tag.
195 const u1 tag = cfs->get_u1_fast();
196 switch (tag) {
197 case JVM_CONSTANT_Class : {
198 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
199 const u2 name_index = cfs->get_u2_fast();
200 cp->klass_index_at_put(index, name_index);
201 break;
202 }
203 case JVM_CONSTANT_Fieldref: {
204 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
205 const u2 class_index = cfs->get_u2_fast();
206 const u2 name_and_type_index = cfs->get_u2_fast();
207 cp->field_at_put(index, class_index, name_and_type_index);
208 break;
209 }
210 case JVM_CONSTANT_Methodref: {
211 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
212 const u2 class_index = cfs->get_u2_fast();
213 const u2 name_and_type_index = cfs->get_u2_fast();
214 cp->method_at_put(index, class_index, name_and_type_index);
215 break;
216 }
217 case JVM_CONSTANT_InterfaceMethodref: {
481 guarantee_property(valid_symbol_at(name_ref_index),
482 "Invalid constant pool index %u in class file %s",
483 name_ref_index, CHECK);
484 guarantee_property(valid_symbol_at(signature_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 signature_ref_index, CHECK);
487 break;
488 }
489 case JVM_CONSTANT_Utf8:
490 break;
491 case JVM_CONSTANT_UnresolvedClass: // fall-through
492 case JVM_CONSTANT_UnresolvedClassInError: {
493 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
494 break;
495 }
496 case JVM_CONSTANT_ClassIndex: {
497 const int class_index = cp->klass_index_at(index);
498 guarantee_property(valid_symbol_at(class_index),
499 "Invalid constant pool index %u in class file %s",
500 class_index, CHECK);
501 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
502 break;
503 }
504 case JVM_CONSTANT_StringIndex: {
505 const int string_index = cp->string_index_at(index);
506 guarantee_property(valid_symbol_at(string_index),
507 "Invalid constant pool index %u in class file %s",
508 string_index, CHECK);
509 Symbol* const sym = cp->symbol_at(string_index);
510 cp->unresolved_string_at_put(index, sym);
511 break;
512 }
513 case JVM_CONSTANT_MethodHandle: {
514 const int ref_index = cp->method_handle_index_at(index);
515 guarantee_property(valid_cp_range(ref_index, length),
516 "Invalid constant pool index %u in class file %s",
517 ref_index, CHECK);
518 const constantTag tag = cp->tag_at(ref_index);
519 const int ref_kind = cp->method_handle_ref_kind_at(index);
520
690 }
691 }
692 } else {
693 if (_need_verify) {
694 // Method name and signature are individually verified above, when iterating
695 // NameAndType_info. Need to check here that signature is non-zero length and
696 // the right type.
697 if (!Signature::is_method(signature)) {
698 throwIllegalSignature("Method", name, signature, CHECK);
699 }
700 }
701 // If a class method name begins with '<', it must be "<init>" and have void signature.
702 const unsigned int name_len = name->utf8_length();
703 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
704 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
705 if (name != vmSymbols::object_initializer_name()) {
706 classfile_parse_error(
707 "Bad method name at constant pool index %u in class file %s",
708 name_ref_index, THREAD);
709 return;
710 } else if (!Signature::is_void_method(signature)) { // must have void signature.
711 throwIllegalSignature("Method", name, signature, CHECK);
712 }
713 }
714 }
715 break;
716 }
717 case JVM_CONSTANT_MethodHandle: {
718 const int ref_index = cp->method_handle_index_at(index);
719 const int ref_kind = cp->method_handle_ref_kind_at(index);
720 switch (ref_kind) {
721 case JVM_REF_invokeVirtual:
722 case JVM_REF_invokeStatic:
723 case JVM_REF_invokeSpecial:
724 case JVM_REF_newInvokeSpecial: {
725 const int name_and_type_ref_index =
726 cp->uncached_name_and_type_ref_index_at(ref_index);
727 const int name_ref_index =
728 cp->name_ref_index_at(name_and_type_ref_index);
729 const Symbol* const name = cp->symbol_at(name_ref_index);
730 if (ref_kind == JVM_REF_newInvokeSpecial) {
731 if (name != vmSymbols::object_initializer_name()) {
732 classfile_parse_error(
733 "Bad constructor name at constant pool index %u in class file %s",
734 name_ref_index, THREAD);
735 return;
736 }
737 } else {
738 if (name == vmSymbols::object_initializer_name()) {
739 classfile_parse_error(
740 "Bad method name at constant pool index %u in class file %s",
741 name_ref_index, THREAD);
742 return;
743 }
744 }
745 break;
746 }
747 // Other ref_kinds are already fully checked in previous pass.
748 } // switch(ref_kind)
749 break;
750 }
751 case JVM_CONSTANT_MethodType: {
752 const Symbol* const no_name = vmSymbols::type_name(); // place holder
753 const Symbol* const signature = cp->method_type_signature_at(index);
754 verify_legal_method_signature(no_name, signature, CHECK);
755 break;
756 }
757 case JVM_CONSTANT_Utf8: {
758 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
770
771 NameSigHash(Symbol* name, Symbol* sig) :
772 _name(name),
773 _sig(sig) {}
774
775 static unsigned int hash(NameSigHash const& namesig) {
776 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
777 }
778
779 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
780 return (e0._name == e1._name) &&
781 (e0._sig == e1._sig);
782 }
783 };
784
785 using NameSigHashtable = HashTable<NameSigHash, int,
786 NameSigHash::HASH_ROW_SIZE,
787 AnyObj::RESOURCE_AREA, mtInternal,
788 &NameSigHash::hash, &NameSigHash::equals>;
789
790 // Side-effects: populates the _local_interfaces field
791 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
792 const int itfs_len,
793 ConstantPool* const cp,
794 bool* const has_nonstatic_concrete_methods,
795 TRAPS) {
796 assert(stream != nullptr, "invariant");
797 assert(cp != nullptr, "invariant");
798 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
799
800 if (itfs_len == 0) {
801 _local_interfaces = Universe::the_empty_instance_klass_array();
802 } else {
803 assert(itfs_len > 0, "only called for len>0");
804 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
805
806 int index;
807 for (index = 0; index < itfs_len; index++) {
808 const u2 interface_index = stream->get_u2(CHECK);
809 Klass* interf;
810 guarantee_property(
811 valid_klass_reference_at(interface_index),
812 "Interface name has bad constant pool index %u in class file %s",
813 interface_index, CHECK);
814 if (cp->tag_at(interface_index).is_klass()) {
815 interf = cp->resolved_klass_at(interface_index);
816 } else {
817 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
818
819 // Don't need to check legal name because it's checked when parsing constant pool.
820 // But need to make sure it's not an array type.
821 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
822 "Bad interface name in class file %s", CHECK);
823
824 // Call resolve on the interface class name with class circularity checking
825 interf = SystemDictionary::resolve_super_or_fail(_class_name,
826 unresolved_klass,
827 Handle(THREAD, _loader_data->class_loader()),
828 false, CHECK);
829 }
830
831 if (!interf->is_interface()) {
832 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
833 err_msg("class %s can not implement %s, because it is not an interface (%s)",
834 _class_name->as_klass_external_name(),
835 interf->external_name(),
836 interf->class_in_module_of_loader()));
837 }
838
839 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
840 *has_nonstatic_concrete_methods = true;
841 }
842 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
843 }
844
845 if (!_need_verify || itfs_len <= 1) {
846 return;
847 }
848
849 // Check if there's any duplicates in interfaces
850 ResourceMark rm(THREAD);
851 // Set containing interface names
852 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
853 for (index = 0; index < itfs_len; index++) {
854 const InstanceKlass* const k = _local_interfaces->at(index);
855 Symbol* interface_name = k->name();
856 // If no duplicates, add (name, nullptr) in hashtable interface_names.
857 if (!interface_names->put(interface_name, 0)) {
858 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
859 interface_name->as_C_string(), THREAD);
860 return;
861 }
862 }
863 }
864 }
865
866 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
867 int constantvalue_index,
868 int signature_index,
869 TRAPS) const {
870 // Make sure the constant pool entry is of a type appropriate to this field
871 guarantee_property(
872 (constantvalue_index > 0 &&
873 constantvalue_index < cp->length()),
874 "Bad initial value index %u in ConstantValue attribute in class file %s",
875 constantvalue_index, CHECK);
922 class AnnotationCollector : public ResourceObj{
923 public:
924 enum Location { _in_field, _in_method, _in_class };
925 enum ID {
926 _unknown = 0,
927 _method_CallerSensitive,
928 _method_ForceInline,
929 _method_DontInline,
930 _method_ChangesCurrentThread,
931 _method_JvmtiHideEvents,
932 _method_JvmtiMountTransition,
933 _method_InjectedProfile,
934 _method_LambdaForm_Compiled,
935 _method_Hidden,
936 _method_Scoped,
937 _method_IntrinsicCandidate,
938 _jdk_internal_vm_annotation_Contended,
939 _field_Stable,
940 _jdk_internal_vm_annotation_ReservedStackAccess,
941 _jdk_internal_ValueBased,
942 _java_lang_Deprecated,
943 _java_lang_Deprecated_for_removal,
944 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
945 _method_AOTRuntimeSetup,
946 _annotation_LIMIT
947 };
948 const Location _location;
949 int _annotations_present;
950 u2 _contended_group;
951
952 AnnotationCollector(Location location)
953 : _location(location), _annotations_present(0), _contended_group(0)
954 {
955 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
956 }
957 // If this annotation name has an ID, report it (or _none).
958 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
959 // Set the annotation name:
960 void set_annotation(ID id) {
961 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1348 }
1349
1350 *constantvalue_index_addr = constantvalue_index;
1351 *is_synthetic_addr = is_synthetic;
1352 *generic_signature_index_addr = generic_signature_index;
1353 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1354 runtime_visible_annotations_length,
1355 CHECK);
1356 parsed_annotations->set_field_annotations(a);
1357 a = allocate_annotations(runtime_visible_type_annotations,
1358 runtime_visible_type_annotations_length,
1359 CHECK);
1360 parsed_annotations->set_field_type_annotations(a);
1361 return;
1362 }
1363
1364
1365 // Side-effects: populates the _fields, _fields_annotations,
1366 // _fields_type_annotations fields
1367 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1368 bool is_interface,
1369 ConstantPool* cp,
1370 const int cp_size,
1371 u2* const java_fields_count_ptr,
1372 TRAPS) {
1373
1374 assert(cfs != nullptr, "invariant");
1375 assert(cp != nullptr, "invariant");
1376 assert(java_fields_count_ptr != nullptr, "invariant");
1377
1378 assert(nullptr == _fields_annotations, "invariant");
1379 assert(nullptr == _fields_type_annotations, "invariant");
1380
1381 cfs->guarantee_more(2, CHECK); // length
1382 const u2 length = cfs->get_u2_fast();
1383 *java_fields_count_ptr = length;
1384
1385 int num_injected = 0;
1386 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1387 &num_injected);
1388 const int total_fields = length + num_injected;
1389
1390 // Allocate a temporary resource array to collect field data.
1391 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1392 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1393
1394 ResourceMark rm(THREAD);
1395 for (int n = 0; n < length; n++) {
1396 // access_flags, name_index, descriptor_index, attributes_count
1397 cfs->guarantee_more(8, CHECK);
1398
1399 AccessFlags access_flags;
1400 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1401 verify_legal_field_modifiers(flags, is_interface, CHECK);
1402 access_flags.set_flags(flags);
1403 FieldInfo::FieldFlags fieldFlags(0);
1404
1405 const u2 name_index = cfs->get_u2_fast();
1406 guarantee_property(valid_symbol_at(name_index),
1407 "Invalid constant pool index %u for field name in class file %s",
1408 name_index, CHECK);
1409 const Symbol* const name = cp->symbol_at(name_index);
1410 verify_legal_field_name(name, CHECK);
1411
1412 const u2 signature_index = cfs->get_u2_fast();
1413 guarantee_property(valid_symbol_at(signature_index),
1414 "Invalid constant pool index %u for field signature in class file %s",
1415 signature_index, CHECK);
1416 const Symbol* const sig = cp->symbol_at(signature_index);
1417 verify_legal_field_signature(name, sig, CHECK);
1418
1419 u2 constantvalue_index = 0;
1420 bool is_synthetic = false;
1421 u2 generic_signature_index = 0;
1422 const bool is_static = access_flags.is_static();
1423 FieldAnnotationCollector parsed_annotations(_loader_data);
1424
1425 const u2 attributes_count = cfs->get_u2_fast();
1426 if (attributes_count > 0) {
1427 parse_field_attributes(cfs,
1428 attributes_count,
1429 is_static,
1430 signature_index,
1431 &constantvalue_index,
1432 &is_synthetic,
1433 &generic_signature_index,
1434 &parsed_annotations,
1435 CHECK);
1436
1437 if (parsed_annotations.field_annotations() != nullptr) {
1438 if (_fields_annotations == nullptr) {
1439 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1440 _loader_data, length, nullptr,
1441 CHECK);
1442 }
1443 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1444 parsed_annotations.set_field_annotations(nullptr);
1445 }
1446 if (parsed_annotations.field_type_annotations() != nullptr) {
1447 if (_fields_type_annotations == nullptr) {
1448 _fields_type_annotations =
1449 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1450 length,
1451 nullptr,
1452 CHECK);
1453 }
1454 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1455 parsed_annotations.set_field_type_annotations(nullptr);
1456 }
1457
1458 if (is_synthetic) {
1459 access_flags.set_is_synthetic();
1460 }
1461 if (generic_signature_index != 0) {
1462 fieldFlags.update_generic(true);
1463 }
1464 }
1465
1466 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1467
1468 // Update number of static oop fields.
1469 if (is_static && is_reference_type(type)) {
1470 _static_oop_count++;
1471 }
1472
1473 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1474 fi.set_index(n);
1475 if (fieldFlags.is_generic()) {
1476 fi.set_generic_signature_index(generic_signature_index);
1477 }
1478 parsed_annotations.apply_to(&fi);
1479 if (fi.field_flags().is_contended()) {
1480 _has_contended_fields = true;
1481 }
1482 _temp_field_info->append(fi);
1483 }
1484 assert(_temp_field_info->length() == length, "Must be");
1485
1486 int index = length;
1487 if (num_injected != 0) {
1488 for (int n = 0; n < num_injected; n++) {
1489 // Check for duplicates
1490 if (injected[n].may_be_java) {
1491 const Symbol* const name = injected[n].name();
1492 const Symbol* const signature = injected[n].signature();
1493 bool duplicate = false;
1494 for (int i = 0; i < length; i++) {
1495 const FieldInfo* const f = _temp_field_info->adr_at(i);
1496 if (name == cp->symbol_at(f->name_index()) &&
1497 signature == cp->symbol_at(f->signature_index())) {
1498 // Symbol is desclared in Java so skip this one
1499 duplicate = true;
1500 break;
1501 }
1502 }
1503 if (duplicate) {
1504 // These will be removed from the field array at the end
1505 continue;
1506 }
1507 }
1508
1509 // Injected field
1510 FieldInfo::FieldFlags fflags(0);
1511 fflags.update_injected(true);
1512 AccessFlags aflags;
1513 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1514 fi.set_index(index);
1515 _temp_field_info->append(fi);
1516 index++;
1517 }
1518 }
1519
1520 assert(_temp_field_info->length() == index, "Must be");
1521
1522 if (_need_verify && length > 1) {
1523 // Check duplicated fields
1524 ResourceMark rm(THREAD);
1525 // Set containing name-signature pairs
1526 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1527 for (int i = 0; i < _temp_field_info->length(); i++) {
1528 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1529 _temp_field_info->adr_at(i)->signature(_cp));
1530 // If no duplicates, add name/signature in hashtable names_and_sigs.
1531 if(!names_and_sigs->put(name_and_sig, 0)) {
1532 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1533 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1534 return;
1535 }
1536 }
1537 }
1538 }
1539
1540
1880 }
1881 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1882 if (_location != _in_field && _location != _in_class) {
1883 break; // only allow for fields and classes
1884 }
1885 if (!EnableContended || (RestrictContended && !privileged)) {
1886 break; // honor privileges
1887 }
1888 return _jdk_internal_vm_annotation_Contended;
1889 }
1890 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1891 if (_location != _in_method) break; // only allow for methods
1892 if (RestrictReservedStack && !privileged) break; // honor privileges
1893 return _jdk_internal_vm_annotation_ReservedStackAccess;
1894 }
1895 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1896 if (_location != _in_class) break; // only allow for classes
1897 if (!privileged) break; // only allow in privileged code
1898 return _jdk_internal_ValueBased;
1899 }
1900 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1901 return _java_lang_Deprecated;
1902 }
1903 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1904 if (_location != _in_class) break; // only allow for classes
1905 if (!privileged) break; // only allow in privileged code
1906 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1907 }
1908 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1909 if (_location != _in_method) break; // only allow for methods
1910 if (!privileged) break; // only allow in privileged code
1911 return _method_AOTRuntimeSetup;
1912 }
1913 default: {
1914 break;
1915 }
1916 }
1917 return AnnotationCollector::_unknown;
1918 }
1919
2116 }
2117
2118 if (runtime_visible_type_annotations_length > 0) {
2119 a = allocate_annotations(runtime_visible_type_annotations,
2120 runtime_visible_type_annotations_length,
2121 CHECK);
2122 cm->set_type_annotations(a);
2123 }
2124 }
2125
2126
2127 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2128 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2129 // Method* to save footprint, so we only know the size of the resulting Method* when the
2130 // entire method attribute is parsed.
2131 //
2132 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2133
2134 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2135 bool is_interface,
2136 const ConstantPool* cp,
2137 bool* const has_localvariable_table,
2138 TRAPS) {
2139 assert(cfs != nullptr, "invariant");
2140 assert(cp != nullptr, "invariant");
2141 assert(has_localvariable_table != nullptr, "invariant");
2142
2143 ResourceMark rm(THREAD);
2144 // Parse fixed parts:
2145 // access_flags, name_index, descriptor_index, attributes_count
2146 cfs->guarantee_more(8, CHECK_NULL);
2147
2148 u2 flags = cfs->get_u2_fast();
2149 const u2 name_index = cfs->get_u2_fast();
2150 const int cp_size = cp->length();
2151 guarantee_property(
2152 valid_symbol_at(name_index),
2153 "Illegal constant pool index %u for method name in class file %s",
2154 name_index, CHECK_NULL);
2155 const Symbol* const name = cp->symbol_at(name_index);
2157
2158 const u2 signature_index = cfs->get_u2_fast();
2159 guarantee_property(
2160 valid_symbol_at(signature_index),
2161 "Illegal constant pool index %u for method signature in class file %s",
2162 signature_index, CHECK_NULL);
2163 const Symbol* const signature = cp->symbol_at(signature_index);
2164
2165 if (name == vmSymbols::class_initializer_name()) {
2166 // We ignore the other access flags for a valid class initializer.
2167 // (JVM Spec 2nd ed., chapter 4.6)
2168 if (_major_version < 51) { // backward compatibility
2169 flags = JVM_ACC_STATIC;
2170 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2171 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2172 } else {
2173 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2174 return nullptr;
2175 }
2176 } else {
2177 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2178 }
2179
2180 if (name == vmSymbols::object_initializer_name() && is_interface) {
2181 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2182 return nullptr;
2183 }
2184
2185 int args_size = -1; // only used when _need_verify is true
2186 if (_need_verify) {
2187 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2188 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2189 verify_legal_method_signature(name, signature, CHECK_NULL);
2190 if (args_size > MAX_ARGS_SIZE) {
2191 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2192 return nullptr;
2193 }
2194 }
2195
2196 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2197
2198 // Default values for code and exceptions attribute elements
2199 u2 max_stack = 0;
2200 u2 max_locals = 0;
2201 u4 code_length = 0;
2202 const u1* code_start = nullptr;
2203 u2 exception_table_length = 0;
2204 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2699 CHECK_NULL);
2700
2701 if (InstanceKlass::is_finalization_enabled() &&
2702 name == vmSymbols::finalize_method_name() &&
2703 signature == vmSymbols::void_method_signature()) {
2704 if (m->is_empty_method()) {
2705 _has_empty_finalizer = true;
2706 } else {
2707 _has_finalizer = true;
2708 }
2709 }
2710
2711 NOT_PRODUCT(m->verify());
2712 return m;
2713 }
2714
2715
2716 // Side-effects: populates the _methods field in the parser
2717 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2718 bool is_interface,
2719 bool* const has_localvariable_table,
2720 bool* has_final_method,
2721 bool* declares_nonstatic_concrete_methods,
2722 TRAPS) {
2723 assert(cfs != nullptr, "invariant");
2724 assert(has_localvariable_table != nullptr, "invariant");
2725 assert(has_final_method != nullptr, "invariant");
2726 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2727
2728 assert(nullptr == _methods, "invariant");
2729
2730 cfs->guarantee_more(2, CHECK); // length
2731 const u2 length = cfs->get_u2_fast();
2732 if (length == 0) {
2733 _methods = Universe::the_empty_method_array();
2734 } else {
2735 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2736 length,
2737 nullptr,
2738 CHECK);
2739
2740 for (int index = 0; index < length; index++) {
2741 Method* method = parse_method(cfs,
2742 is_interface,
2743 _cp,
2744 has_localvariable_table,
2745 CHECK);
2746
2747 if (method->is_final()) {
2748 *has_final_method = true;
2749 }
2750 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2751 // used for interface initialization, and default method inheritance analysis
2752 if (is_interface && !(*declares_nonstatic_concrete_methods)
2753 && !method->is_abstract() && !method->is_static()) {
2754 *declares_nonstatic_concrete_methods = true;
2755 }
2756 _methods->at_put(index, method);
2757 }
2758
2759 if (_need_verify && length > 1) {
2760 // Check duplicated methods
2761 ResourceMark rm(THREAD);
2762 // Set containing name-signature pairs
2988 valid_klass_reference_at(outer_class_info_index),
2989 "outer_class_info_index %u has bad constant type in class file %s",
2990 outer_class_info_index, CHECK_0);
2991
2992 if (outer_class_info_index != 0) {
2993 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
2994 char* bytes = (char*)outer_class_name->bytes();
2995 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
2996 "Outer class is an array class in class file %s", CHECK_0);
2997 }
2998 // Inner class name
2999 const u2 inner_name_index = cfs->get_u2_fast();
3000 guarantee_property(
3001 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3002 "inner_name_index %u has bad constant type in class file %s",
3003 inner_name_index, CHECK_0);
3004 if (_need_verify) {
3005 guarantee_property(inner_class_info_index != outer_class_info_index,
3006 "Class is both outer and inner class in class file %s", CHECK_0);
3007 }
3008 // Access flags
3009 u2 flags;
3010 // JVM_ACC_MODULE is defined in JDK-9 and later.
3011 if (_major_version >= JAVA_9_VERSION) {
3012 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3013 } else {
3014 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3015 }
3016 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3017 // Set abstract bit for old class files for backward compatibility
3018 flags |= JVM_ACC_ABSTRACT;
3019 }
3020
3021 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3022 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3023 AccessFlags inner_access_flags(flags);
3024
3025 inner_classes->at_put(index++, inner_class_info_index);
3026 inner_classes->at_put(index++, outer_class_info_index);
3027 inner_classes->at_put(index++, inner_name_index);
3028 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3029 }
3030
3031 // Check for circular and duplicate entries.
3032 bool has_circularity = false;
3033 if (_need_verify) {
3034 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3035 if (has_circularity) {
3036 // If circularity check failed then ignore InnerClasses attribute.
3037 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3038 index = 0;
3039 if (parsed_enclosingmethod_attribute) {
3040 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3106 if (length > 0) {
3107 int index = 0;
3108 cfs->guarantee_more(2 * length, CHECK_0);
3109 for (int n = 0; n < length; n++) {
3110 const u2 class_info_index = cfs->get_u2_fast();
3111 guarantee_property(
3112 valid_klass_reference_at(class_info_index),
3113 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3114 class_info_index, CHECK_0);
3115 permitted_subclasses->at_put(index++, class_info_index);
3116 }
3117 assert(index == size, "wrong size");
3118 }
3119
3120 // Restore buffer's current position.
3121 cfs->set_current(current_mark);
3122
3123 return length;
3124 }
3125
3126 // Record {
3127 // u2 attribute_name_index;
3128 // u4 attribute_length;
3129 // u2 components_count;
3130 // component_info components[components_count];
3131 // }
3132 // component_info {
3133 // u2 name_index;
3134 // u2 descriptor_index
3135 // u2 attributes_count;
3136 // attribute_info_attributes[attributes_count];
3137 // }
3138 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3139 const ConstantPool* cp,
3140 const u1* const record_attribute_start,
3141 TRAPS) {
3142 const u1* const current_mark = cfs->current();
3143 int components_count = 0;
3144 unsigned int calculate_attr_size = 0;
3145 if (record_attribute_start != nullptr) {
3371 }
3372 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3373 "Bad length on BootstrapMethods in class file %s",
3374 CHECK);
3375 }
3376
3377 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3378 ConstantPool* cp,
3379 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3380 TRAPS) {
3381 assert(cfs != nullptr, "invariant");
3382 assert(cp != nullptr, "invariant");
3383 assert(parsed_annotations != nullptr, "invariant");
3384
3385 // Set inner classes attribute to default sentinel
3386 _inner_classes = Universe::the_empty_short_array();
3387 // Set nest members attribute to default sentinel
3388 _nest_members = Universe::the_empty_short_array();
3389 // Set _permitted_subclasses attribute to default sentinel
3390 _permitted_subclasses = Universe::the_empty_short_array();
3391 cfs->guarantee_more(2, CHECK); // attributes_count
3392 u2 attributes_count = cfs->get_u2_fast();
3393 bool parsed_sourcefile_attribute = false;
3394 bool parsed_innerclasses_attribute = false;
3395 bool parsed_nest_members_attribute = false;
3396 bool parsed_permitted_subclasses_attribute = false;
3397 bool parsed_nest_host_attribute = false;
3398 bool parsed_record_attribute = false;
3399 bool parsed_enclosingmethod_attribute = false;
3400 bool parsed_bootstrap_methods_attribute = false;
3401 const u1* runtime_visible_annotations = nullptr;
3402 int runtime_visible_annotations_length = 0;
3403 const u1* runtime_visible_type_annotations = nullptr;
3404 int runtime_visible_type_annotations_length = 0;
3405 bool runtime_invisible_type_annotations_exists = false;
3406 bool runtime_invisible_annotations_exists = false;
3407 bool parsed_source_debug_ext_annotations_exist = false;
3408 const u1* inner_classes_attribute_start = nullptr;
3409 u4 inner_classes_attribute_length = 0;
3410 u2 enclosing_method_class_index = 0;
3411 u2 enclosing_method_method_index = 0;
3412 const u1* nest_members_attribute_start = nullptr;
3413 u4 nest_members_attribute_length = 0;
3414 const u1* record_attribute_start = nullptr;
3415 u4 record_attribute_length = 0;
3416 const u1* permitted_subclasses_attribute_start = nullptr;
3417 u4 permitted_subclasses_attribute_length = 0;
3418
3419 // Iterate over attributes
3420 while (attributes_count--) {
3421 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3422 const u2 attribute_name_index = cfs->get_u2_fast();
3423 const u4 attribute_length = cfs->get_u4_fast();
3424 guarantee_property(
3425 valid_symbol_at(attribute_name_index),
3426 "Attribute name has bad constant pool index %u in class file %s",
3427 attribute_name_index, CHECK);
3428 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3429 if (tag == vmSymbols::tag_source_file()) {
3430 // Check for SourceFile tag
3431 if (_need_verify) {
3432 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3433 }
3434 if (parsed_sourcefile_attribute) {
3435 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3436 return;
3437 } else {
3613 return;
3614 }
3615 parsed_record_attribute = true;
3616 record_attribute_start = cfs->current();
3617 record_attribute_length = attribute_length;
3618 } else if (_major_version >= JAVA_17_VERSION) {
3619 if (tag == vmSymbols::tag_permitted_subclasses()) {
3620 if (parsed_permitted_subclasses_attribute) {
3621 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3622 return;
3623 }
3624 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3625 if (_access_flags.is_final()) {
3626 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3627 return;
3628 }
3629 parsed_permitted_subclasses_attribute = true;
3630 permitted_subclasses_attribute_start = cfs->current();
3631 permitted_subclasses_attribute_length = attribute_length;
3632 }
3633 }
3634 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3635 cfs->skip_u1(attribute_length, CHECK);
3636 } else {
3637 // Unknown attribute
3638 cfs->skip_u1(attribute_length, CHECK);
3639 }
3640 } else {
3641 // Unknown attribute
3642 cfs->skip_u1(attribute_length, CHECK);
3643 }
3644 } else {
3645 // Unknown attribute
3646 cfs->skip_u1(attribute_length, CHECK);
3647 }
3648 }
3649 _class_annotations = allocate_annotations(runtime_visible_annotations,
3650 runtime_visible_annotations_length,
3651 CHECK);
3652 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3689 CHECK);
3690 if (_need_verify) {
3691 guarantee_property(record_attribute_length == calculated_attr_length,
3692 "Record attribute has wrong length in class file %s",
3693 CHECK);
3694 }
3695 }
3696
3697 if (parsed_permitted_subclasses_attribute) {
3698 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3699 cfs,
3700 permitted_subclasses_attribute_start,
3701 CHECK);
3702 if (_need_verify) {
3703 guarantee_property(
3704 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3705 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3706 }
3707 }
3708
3709 if (_max_bootstrap_specifier_index >= 0) {
3710 guarantee_property(parsed_bootstrap_methods_attribute,
3711 "Missing BootstrapMethods attribute in class file %s", CHECK);
3712 }
3713 }
3714
3715 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3716 assert(k != nullptr, "invariant");
3717
3718 if (_synthetic_flag)
3719 k->set_is_synthetic();
3720 if (_sourcefile_index != 0) {
3721 k->set_source_file_name_index(_sourcefile_index);
3722 }
3723 if (_generic_signature_index != 0) {
3724 k->set_generic_signature_index(_generic_signature_index);
3725 }
3726 if (_sde_buffer != nullptr) {
3727 k->set_source_debug_extension(_sde_buffer, _sde_length);
3728 }
3755 _class_type_annotations = nullptr;
3756 _fields_annotations = nullptr;
3757 _fields_type_annotations = nullptr;
3758 }
3759
3760 // Transfer ownership of metadata allocated to the InstanceKlass.
3761 void ClassFileParser::apply_parsed_class_metadata(
3762 InstanceKlass* this_klass,
3763 int java_fields_count) {
3764 assert(this_klass != nullptr, "invariant");
3765
3766 _cp->set_pool_holder(this_klass);
3767 this_klass->set_constants(_cp);
3768 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3769 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3770 this_klass->set_fields_status(_fields_status);
3771 this_klass->set_methods(_methods);
3772 this_klass->set_inner_classes(_inner_classes);
3773 this_klass->set_nest_members(_nest_members);
3774 this_klass->set_nest_host_index(_nest_host);
3775 this_klass->set_annotations(_combined_annotations);
3776 this_klass->set_permitted_subclasses(_permitted_subclasses);
3777 this_klass->set_record_components(_record_components);
3778
3779 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3780
3781 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3782 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3783 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3784 // its _super. If an OOM occurs while loading the current klass, its _super field
3785 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3786 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3787 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3788
3789 // Clear out these fields so they don't get deallocated by the destructor
3790 clear_class_metadata();
3791 }
3792
3793 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3794 int anno_length,
3795 TRAPS) {
3796 AnnotationArray* annotations = nullptr;
3797 if (anno != nullptr) {
3798 annotations = MetadataFactory::new_array<u1>(_loader_data,
3799 anno_length,
3800 CHECK_(annotations));
3801 for (int i = 0; i < anno_length; i++) {
3802 annotations->at_put(i, anno[i]);
3803 }
3804 }
3805 return annotations;
3806 }
3807
3808 void ClassFileParser::check_super_class(ConstantPool* const cp,
3809 const int super_class_index,
3810 const bool need_verify,
3811 TRAPS) {
3812 assert(cp != nullptr, "invariant");
3813
3814 if (super_class_index == 0) {
3815 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3816 "Invalid superclass index %u in class file %s",
3817 super_class_index,
3818 CHECK);
3819 } else {
3820 guarantee_property(valid_klass_reference_at(super_class_index),
3821 "Invalid superclass index %u in class file %s",
3822 super_class_index,
3823 CHECK);
3824
3825 // The class name should be legal because it is checked when parsing constant pool.
3826 // However, make sure it is not an array type.
3827 if (need_verify) {
3828 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3829 "Bad superclass name in class file %s", CHECK);
3830 }
3831 }
3832 }
3833
3834 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3835 _max_nonstatic_oop_maps = max_blocks;
3836 _nonstatic_oop_map_count = 0;
3837 if (max_blocks == 0) {
3989 // See documentation of InstanceKlass::can_be_fastpath_allocated().
3990 assert(ik->size_helper() > 0, "layout_helper is initialized");
3991 if (ik->is_abstract() || ik->is_interface()
3992 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3993 || ik->size_helper() >= FastAllocateSizeLimit) {
3994 // Forbid fast-path allocation.
3995 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3996 ik->set_layout_helper(lh);
3997 }
3998
3999 // Propagate the AOT runtimeSetup method discovery
4000 if (_has_aot_runtime_setup_method) {
4001 ik->set_is_runtime_setup_required();
4002 if (log_is_enabled(Info, aot, init)) {
4003 ResourceMark rm;
4004 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4005 }
4006 }
4007 }
4008
4009 // utility methods for appending an array with check for duplicates
4010
4011 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4012 const Array<InstanceKlass*>* const ifs) {
4013 // iterate over new interfaces
4014 for (int i = 0; i < ifs->length(); i++) {
4015 InstanceKlass* const e = ifs->at(i);
4016 assert(e->is_klass() && e->is_interface(), "just checking");
4017 // add new interface
4018 result->append_if_missing(e);
4019 }
4020 }
4021
4022 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4023 Array<InstanceKlass*>* local_ifs,
4024 ClassLoaderData* loader_data,
4025 TRAPS) {
4026 assert(local_ifs != nullptr, "invariant");
4027 assert(loader_data != nullptr, "invariant");
4028
4032 // Add superclass transitive interfaces size
4033 if (super != nullptr) {
4034 super_size = super->transitive_interfaces()->length();
4035 max_transitive_size += super_size;
4036 }
4037 // Add local interfaces' super interfaces
4038 const int local_size = local_ifs->length();
4039 for (int i = 0; i < local_size; i++) {
4040 InstanceKlass* const l = local_ifs->at(i);
4041 max_transitive_size += l->transitive_interfaces()->length();
4042 }
4043 // Finally add local interfaces
4044 max_transitive_size += local_size;
4045 // Construct array
4046 if (max_transitive_size == 0) {
4047 // no interfaces, use canonicalized array
4048 return Universe::the_empty_instance_klass_array();
4049 } else if (max_transitive_size == super_size) {
4050 // no new local interfaces added, share superklass' transitive interface array
4051 return super->transitive_interfaces();
4052 } else if (max_transitive_size == local_size) {
4053 // only local interfaces added, share local interface array
4054 return local_ifs;
4055 } else {
4056 ResourceMark rm;
4057 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4058
4059 // Copy down from superclass
4060 if (super != nullptr) {
4061 append_interfaces(result, super->transitive_interfaces());
4062 }
4063
4064 // Copy down from local interfaces' superinterfaces
4065 for (int i = 0; i < local_size; i++) {
4066 InstanceKlass* const l = local_ifs->at(i);
4067 append_interfaces(result, l->transitive_interfaces());
4068 }
4069 // Finally add local interfaces
4070 append_interfaces(result, local_ifs);
4071
4072 // length will be less than the max_transitive_size if duplicates were removed
4073 const int length = result->length();
4074 assert(length <= max_transitive_size, "just checking");
4075 Array<InstanceKlass*>* const new_result =
4076 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4077 for (int i = 0; i < length; i++) {
4078 InstanceKlass* const e = result->at(i);
4079 assert(e != nullptr, "just checking");
4080 new_result->at_put(i, e);
4081 }
4082 return new_result;
4083 }
4084 }
4085
4086 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4087 assert(this_klass != nullptr, "invariant");
4088 const InstanceKlass* const super = this_klass->super();
4089
4090 if (super != nullptr) {
4091 if (super->is_final()) {
4092 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4093 return;
4094 }
4095
4096 if (super->is_sealed()) {
4097 stringStream ss;
4098 ResourceMark rm(THREAD);
4099 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4100 classfile_icce_error(ss.as_string(), THREAD);
4101 return;
4102 }
4103 }
4104
4105 Reflection::VerifyClassAccessResults vca_result =
4106 Reflection::verify_class_access(this_klass, super, false);
4107 if (vca_result != Reflection::ACCESS_OK) {
4108 ResourceMark rm(THREAD);
4109 char* msg = Reflection::verify_class_access_msg(this_klass,
4110 super,
4111 vca_result);
4112
4113 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4114 if (msg == nullptr) {
4115 bool same_module = (this_klass->module() == super->module());
4116 Exceptions::fthrow(
4117 THREAD_AND_LOCATION,
4118 vmSymbols::java_lang_IllegalAccessError(),
4119 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4120 this_klass->external_name(),
4121 super->is_abstract() ? "abstract " : "",
4122 super->external_name(),
4123 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4124 (same_module) ? "" : "; ",
4277 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4278 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4279 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4280 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4281 if (is_module) {
4282 ResourceMark rm(THREAD);
4283 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4284 Exceptions::fthrow(
4285 THREAD_AND_LOCATION,
4286 vmSymbols::java_lang_NoClassDefFoundError(),
4287 "%s is not a class because access_flag ACC_MODULE is set",
4288 _class_name->as_C_string());
4289 return;
4290 }
4291
4292 if (!_need_verify) { return; }
4293
4294 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4295 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4296 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4297 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4298 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4299 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4300 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4301
4302 if ((is_abstract && is_final) ||
4303 (is_interface && !is_abstract) ||
4304 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4305 (!is_interface && major_gte_1_5 && is_annotation)) {
4306 ResourceMark rm(THREAD);
4307 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4308 if (inner_name == nullptr && !is_anonymous_inner_class) {
4309 Exceptions::fthrow(
4310 THREAD_AND_LOCATION,
4311 vmSymbols::java_lang_ClassFormatError(),
4312 "Illegal class modifiers in class %s: 0x%X",
4313 _class_name->as_C_string(), flags
4314 );
4315 } else {
4316 if (is_anonymous_inner_class) {
4317 Exceptions::fthrow(
4318 THREAD_AND_LOCATION,
4319 vmSymbols::java_lang_ClassFormatError(),
4320 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4321 _class_name->as_C_string(), flags
4322 );
4323 } else {
4324 Exceptions::fthrow(
4325 THREAD_AND_LOCATION,
4326 vmSymbols::java_lang_ClassFormatError(),
4380 THREAD_AND_LOCATION,
4381 vmSymbols::java_lang_UnsupportedClassVersionError(),
4382 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4383 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4384 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4385 return;
4386 }
4387
4388 if (!Arguments::enable_preview()) {
4389 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4390 class_name, major, minor, THREAD);
4391 return;
4392 }
4393
4394 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4395 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4396 class_name, major, minor, THREAD);
4397 }
4398 }
4399
4400 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4401 bool is_interface,
4402 TRAPS) const {
4403 if (!_need_verify) { return; }
4404
4405 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4406 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4407 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4408 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4409 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4410 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4411 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4412 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4413 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4414
4415 bool is_illegal = false;
4416
4417 if (is_interface) {
4418 if (!is_public || !is_static || !is_final || is_private ||
4419 is_protected || is_volatile || is_transient ||
4420 (major_gte_1_5 && is_enum)) {
4421 is_illegal = true;
4422 }
4423 } else { // not interface
4424 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4425 is_illegal = true;
4426 }
4427 }
4428
4429 if (is_illegal) {
4430 ResourceMark rm(THREAD);
4431 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4432 Exceptions::fthrow(
4433 THREAD_AND_LOCATION,
4434 vmSymbols::java_lang_ClassFormatError(),
4435 "Illegal field modifiers in class %s: 0x%X",
4436 _class_name->as_C_string(), flags);
4437 return;
4438 }
4439 }
4440
4441 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4442 bool is_interface,
4443 const Symbol* name,
4444 TRAPS) const {
4445 if (!_need_verify) { return; }
4446
4447 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4448 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4449 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4450 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4451 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4452 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4453 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4454 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4455 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4456 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4457 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4458 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4459 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4460 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4461
4462 bool is_illegal = false;
4463
4464 if (is_interface) {
4465 if (major_gte_8) {
4466 // Class file version is JAVA_8_VERSION or later Methods of
4467 // interfaces may set any of the flags except ACC_PROTECTED,
4468 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4469 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4470 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4471 (is_native || is_protected || is_final || is_synchronized) ||
4472 // If a specific method of a class or interface has its
4473 // ACC_ABSTRACT flag set, it must not have any of its
4474 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4475 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4476 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4477 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4478 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4479 is_illegal = true;
4480 }
4481 } else if (major_gte_1_5) {
4482 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4483 if (!is_public || is_private || is_protected || is_static || is_final ||
4484 is_synchronized || is_native || !is_abstract || is_strict) {
4485 is_illegal = true;
4486 }
4487 } else {
4488 // Class file version is pre-JAVA_1_5_VERSION
4489 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4490 is_illegal = true;
4491 }
4492 }
4493 } else { // not interface
4494 if (has_illegal_visibility(flags)) {
4495 is_illegal = true;
4496 } else {
4497 if (is_initializer) {
4498 if (is_static || is_final || is_synchronized || is_native ||
4499 is_abstract || (major_gte_1_5 && is_bridge)) {
4500 is_illegal = true;
4501 }
4502 } else { // not initializer
4503 if (is_abstract) {
4504 if ((is_final || is_native || is_private || is_static ||
4505 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4506 is_illegal = true;
4507 }
4508 }
4509 }
4510 }
4511 }
4512
4513 if (is_illegal) {
4514 ResourceMark rm(THREAD);
4515 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4516 Exceptions::fthrow(
4517 THREAD_AND_LOCATION,
4518 vmSymbols::java_lang_ClassFormatError(),
4519 "Method %s in class %s has illegal modifiers: 0x%X",
4520 name->as_C_string(), _class_name->as_C_string(), flags);
4521 return;
4522 }
4523 }
4524
4525 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4526 int length,
4527 TRAPS) const {
4528 assert(_need_verify, "only called when _need_verify is true");
4529 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4530 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4531 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4532 }
4533 }
4534
4535 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4536 // In class names, '/' separates unqualified names. This is verified in this function also.
4537 // Method names also may not contain the characters '<' or '>', unless <init>
4538 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4539 // method. Because these names have been checked as special cases before
4540 // calling this method in verify_legal_method_name.
4558 if (type == ClassFileParser::LegalClass) {
4559 if (p == name || p+1 >= name+length ||
4560 *(p+1) == JVM_SIGNATURE_SLASH) {
4561 return false;
4562 }
4563 } else {
4564 return false; // do not permit '/' unless it's class name
4565 }
4566 break;
4567 case JVM_SIGNATURE_SPECIAL:
4568 case JVM_SIGNATURE_ENDSPECIAL:
4569 // do not permit '<' or '>' in method names
4570 if (type == ClassFileParser::LegalMethod) {
4571 return false;
4572 }
4573 }
4574 }
4575 return true;
4576 }
4577
4578 // Take pointer to a UTF8 byte string (not NUL-terminated).
4579 // Skip over the longest part of the string that could
4580 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4581 // Return a pointer to just past the fieldname.
4582 // Return null if no fieldname at all was found, or in the case of slash_ok
4583 // being true, we saw consecutive slashes (meaning we were looking for a
4584 // qualified path but found something that was badly-formed).
4585 static const char* skip_over_field_name(const char* const name,
4586 bool slash_ok,
4587 unsigned int length) {
4588 const char* p;
4589 jboolean last_is_slash = false;
4590 jboolean not_first_ch = false;
4591
4592 for (p = name; p != name + length; not_first_ch = true) {
4593 const char* old_p = p;
4594 jchar ch = *p;
4595 if (ch < 128) {
4596 p++;
4597 // quick check for ascii
4659 // be taken as a field signature. Allow "void" if void_ok.
4660 // Return a pointer to just past the signature.
4661 // Return null if no legal signature is found.
4662 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4663 bool void_ok,
4664 unsigned int length,
4665 TRAPS) const {
4666 unsigned int array_dim = 0;
4667 while (length > 0) {
4668 switch (signature[0]) {
4669 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4670 case JVM_SIGNATURE_BOOLEAN:
4671 case JVM_SIGNATURE_BYTE:
4672 case JVM_SIGNATURE_CHAR:
4673 case JVM_SIGNATURE_SHORT:
4674 case JVM_SIGNATURE_INT:
4675 case JVM_SIGNATURE_FLOAT:
4676 case JVM_SIGNATURE_LONG:
4677 case JVM_SIGNATURE_DOUBLE:
4678 return signature + 1;
4679 case JVM_SIGNATURE_CLASS: {
4680 if (_major_version < JAVA_1_5_VERSION) {
4681 signature++;
4682 length--;
4683 // Skip over the class name if one is there
4684 const char* const p = skip_over_field_name(signature, true, length);
4685 assert(p == nullptr || p > signature, "must parse one character at least");
4686 // The next character better be a semicolon
4687 if (p != nullptr && // Parse of field name succeeded.
4688 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4689 p[0] == JVM_SIGNATURE_ENDCLASS) {
4690 return p + 1;
4691 }
4692 }
4693 else {
4694 // Skip leading 'L' and ignore first appearance of ';'
4695 signature++;
4696 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4697 // Format check signature
4698 if (c != nullptr) {
4699 int newlen = pointer_delta_as_int(c, (char*) signature);
4700 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4701 if (!legal) {
4702 classfile_parse_error("Class name is empty or contains illegal character "
4703 "in descriptor in class file %s",
4704 THREAD);
4705 return nullptr;
4706 }
4707 return signature + newlen + 1;
4708 }
4709 }
4710 return nullptr;
4711 }
4712 case JVM_SIGNATURE_ARRAY:
4713 array_dim++;
4714 if (array_dim > 255) {
4730
4731 // Checks if name is a legal class name.
4732 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4733 if (!_need_verify) { return; }
4734
4735 assert(name->refcount() > 0, "symbol must be kept alive");
4736 char* bytes = (char*)name->bytes();
4737 unsigned int length = name->utf8_length();
4738 bool legal = false;
4739
4740 if (length > 0) {
4741 const char* p;
4742 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4743 p = skip_over_field_signature(bytes, false, length, CHECK);
4744 legal = (p != nullptr) && ((p - bytes) == (int)length);
4745 } else if (_major_version < JAVA_1_5_VERSION) {
4746 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4747 p = skip_over_field_name(bytes, true, length);
4748 legal = (p != nullptr) && ((p - bytes) == (int)length);
4749 }
4750 } else {
4751 // 4900761: relax the constraints based on JSR202 spec
4752 // Class names may be drawn from the entire Unicode character set.
4753 // Identifiers between '/' must be unqualified names.
4754 // The utf8 string has been verified when parsing cpool entries.
4755 legal = verify_unqualified_name(bytes, length, LegalClass);
4756 }
4757 }
4758 if (!legal) {
4759 ResourceMark rm(THREAD);
4760 assert(_class_name != nullptr, "invariant");
4761 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4762 Exceptions::fthrow(
4763 THREAD_AND_LOCATION,
4764 vmSymbols::java_lang_ClassFormatError(),
4765 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4766 _class_name->as_C_string()
4767 );
4768 return;
4769 }
4797 THREAD_AND_LOCATION,
4798 vmSymbols::java_lang_ClassFormatError(),
4799 "Illegal field name \"%.*s\" in class %s", length, bytes,
4800 _class_name->as_C_string()
4801 );
4802 return;
4803 }
4804 }
4805
4806 // Checks if name is a legal method name.
4807 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4808 if (!_need_verify) { return; }
4809
4810 assert(name != nullptr, "method name is null");
4811 char* bytes = (char*)name->bytes();
4812 unsigned int length = name->utf8_length();
4813 bool legal = false;
4814
4815 if (length > 0) {
4816 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4817 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4818 legal = true;
4819 }
4820 } else if (_major_version < JAVA_1_5_VERSION) {
4821 const char* p;
4822 p = skip_over_field_name(bytes, false, length);
4823 legal = (p != nullptr) && ((p - bytes) == (int)length);
4824 } else {
4825 // 4881221: relax the constraints based on JSR202 spec
4826 legal = verify_unqualified_name(bytes, length, LegalMethod);
4827 }
4828 }
4829
4830 if (!legal) {
4831 ResourceMark rm(THREAD);
4832 assert(_class_name != nullptr, "invariant");
4833 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4834 Exceptions::fthrow(
4835 THREAD_AND_LOCATION,
4836 vmSymbols::java_lang_ClassFormatError(),
4837 "Illegal method name \"%.*s\" in class %s", length, bytes,
4838 _class_name->as_C_string()
4839 );
4840 return;
4841 }
4842 }
4843
4844
4845 // Checks if signature is a legal field signature.
4846 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4847 const Symbol* signature,
4848 TRAPS) const {
4849 if (!_need_verify) { return; }
4850
4851 const char* const bytes = (const char*)signature->bytes();
4852 const unsigned int length = signature->utf8_length();
4853 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4854
4855 if (p == nullptr || (p - bytes) != (int)length) {
4856 throwIllegalSignature("Field", name, signature, CHECK);
4857 }
4858 }
4859
4860 // Check that the signature is compatible with the method name. For example,
4861 // check that <init> has a void signature.
4862 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4863 const Symbol* signature,
4864 TRAPS) const {
4865 if (!_need_verify) {
4866 return;
4867 }
4868
4869 // Class initializers cannot have args for class format version >= 51.
4870 if (name == vmSymbols::class_initializer_name() &&
4871 signature != vmSymbols::void_method_signature() &&
4872 _major_version >= JAVA_7_VERSION) {
4873 throwIllegalSignature("Method", name, signature, THREAD);
4874 return;
4875 }
4876
4877 int sig_length = signature->utf8_length();
4878 if (name->utf8_length() > 0 &&
4879 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4880 sig_length > 0 &&
4881 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4882 throwIllegalSignature("Method", name, signature, THREAD);
4883 }
4884 }
4885
4886 // Checks if signature is a legal method signature.
4887 // Returns number of parameters
4888 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
4889 const Symbol* signature,
4890 TRAPS) const {
4891 if (!_need_verify) {
4892 // make sure caller's args_size will be less than 0 even for non-static
4893 // method so it will be recomputed in compute_size_of_parameters().
4894 return -2;
4895 }
4896
4897 unsigned int args_size = 0;
4898 const char* p = (const char*)signature->bytes();
4899 unsigned int length = signature->utf8_length();
4900 const char* nextp;
4901
4912 length -= pointer_delta_as_int(nextp, p);
4913 p = nextp;
4914 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4915 }
4916 // The first non-signature thing better be a ')'
4917 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4918 length--;
4919 // Now we better just have a return value
4920 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4921 if (nextp && ((int)length == (nextp - p))) {
4922 return args_size;
4923 }
4924 }
4925 }
4926 // Report error
4927 throwIllegalSignature("Method", name, signature, THREAD);
4928 return 0;
4929 }
4930
4931 int ClassFileParser::static_field_size() const {
4932 assert(_field_info != nullptr, "invariant");
4933 return _field_info->_static_field_size;
4934 }
4935
4936 int ClassFileParser::total_oop_map_count() const {
4937 assert(_field_info != nullptr, "invariant");
4938 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4939 }
4940
4941 jint ClassFileParser::layout_size() const {
4942 assert(_field_info != nullptr, "invariant");
4943 return _field_info->_instance_size;
4944 }
4945
4946 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4947 const Array<Method*>* methods) {
4948 assert(ik != nullptr, "invariant");
4949 assert(methods != nullptr, "invariant");
4950
4951 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4952 // (We used to do this lazily, but now we query it in Rewriter,
4953 // which is eagerly done for every method, so we might as well do it now,
4954 // when everything is fresh in memory.)
4955 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4956
4957 if (klass_id != vmSymbolID::NO_SID) {
4958 for (int j = 0; j < methods->length(); ++j) {
4959 Method* method = methods->at(j);
4960 method->init_intrinsic_id(klass_id);
4961
4962 if (CheckIntrinsics) {
4963 // Check if an intrinsic is defined for method 'method',
5038 }
5039 }
5040
5041 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5042 const ClassInstanceInfo& cl_inst_info,
5043 TRAPS) {
5044 if (_klass != nullptr) {
5045 return _klass;
5046 }
5047
5048 InstanceKlass* const ik =
5049 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5050
5051 if (is_hidden()) {
5052 mangle_hidden_class_name(ik);
5053 }
5054
5055 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5056
5057 assert(_klass == ik, "invariant");
5058
5059 return ik;
5060 }
5061
5062 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5063 bool changed_by_loadhook,
5064 const ClassInstanceInfo& cl_inst_info,
5065 TRAPS) {
5066 assert(ik != nullptr, "invariant");
5067
5068 // Set name and CLD before adding to CLD
5069 ik->set_class_loader_data(_loader_data);
5070 ik->set_class_loader_type();
5071 ik->set_name(_class_name);
5072
5073 // Add all classes to our internal class loader list here,
5074 // including classes in the bootstrap (null) class loader.
5075 const bool publicize = !is_internal();
5076
5077 _loader_data->add_class(ik, publicize);
5078
5079 set_klass_to_deallocate(ik);
5080
5081 assert(_field_info != nullptr, "invariant");
5082 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5083 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5084 "sanity");
5085
5086 assert(ik->is_instance_klass(), "sanity");
5087 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5088
5089 // Fill in information already parsed
5090 ik->set_should_verify_class(_need_verify);
5091
5092 // Not yet: supers are done below to support the new subtype-checking fields
5093 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5094 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5095 ik->set_static_oop_field_count(_static_oop_count);
5096
5097 // this transfers ownership of a lot of arrays from
5098 // the parser onto the InstanceKlass*
5099 apply_parsed_class_metadata(ik, _java_fields_count);
5100
5101 // can only set dynamic nest-host after static nest information is set
5102 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5103 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5104 }
5105
5106 // note that is not safe to use the fields in the parser from this point on
5107 assert(nullptr == _cp, "invariant");
5108 assert(nullptr == _fieldinfo_stream, "invariant");
5109 assert(nullptr == _fieldinfo_search_table, "invariant");
5110 assert(nullptr == _fields_status, "invariant");
5111 assert(nullptr == _methods, "invariant");
5112 assert(nullptr == _inner_classes, "invariant");
5113 assert(nullptr == _nest_members, "invariant");
5114 assert(nullptr == _combined_annotations, "invariant");
5115 assert(nullptr == _record_components, "invariant");
5116 assert(nullptr == _permitted_subclasses, "invariant");
5117
5118 if (_has_localvariable_table) {
5119 ik->set_has_localvariable_table(true);
5120 }
5121
5122 if (_has_final_method) {
5123 ik->set_has_final_method();
5124 }
5125
5126 ik->copy_method_ordering(_method_ordering, CHECK);
5127 // The InstanceKlass::_methods_jmethod_ids cache
5128 // is managed on the assumption that the initial cache
5129 // size is equal to the number of methods in the class. If
5130 // that changes, then InstanceKlass::idnum_can_increment()
5131 // has to be changed accordingly.
5132 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5133
5134 ik->set_this_class_index(_this_class_index);
5135
5136 if (_is_hidden) {
5173 if ((_num_miranda_methods > 0) ||
5174 // if this class introduced new miranda methods or
5175 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5176 // super class exists and this class inherited miranda methods
5177 ) {
5178 ik->set_has_miranda_methods(); // then set a flag
5179 }
5180
5181 // Fill in information needed to compute superclasses.
5182 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5183 ik->set_transitive_interfaces(_transitive_interfaces);
5184 ik->set_local_interfaces(_local_interfaces);
5185 _transitive_interfaces = nullptr;
5186 _local_interfaces = nullptr;
5187
5188 // Initialize itable offset tables
5189 klassItable::setup_itable_offset_table(ik);
5190
5191 // Compute transitive closure of interfaces this class implements
5192 // Do final class setup
5193 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5194 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5195 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5196 }
5197
5198 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5199 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5200 ik->set_has_contended_annotations(true);
5201 }
5202
5203 // Fill in has_finalizer and layout_helper
5204 set_precomputed_flags(ik);
5205
5206 // check if this class can access its super class
5207 check_super_class_access(ik, CHECK);
5208
5209 // check if this class can access its superinterfaces
5210 check_super_interface_access(ik, CHECK);
5211
5212 // check if this class overrides any final method
5213 check_final_method_override(ik, CHECK);
5234
5235 assert(_all_mirandas != nullptr, "invariant");
5236
5237 // Generate any default methods - default methods are public interface methods
5238 // that have a default implementation. This is new with Java 8.
5239 if (_has_nonstatic_concrete_methods) {
5240 DefaultMethods::generate_default_methods(ik,
5241 _all_mirandas,
5242 CHECK);
5243 }
5244
5245 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5246 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5247 !module_entry->has_default_read_edges()) {
5248 if (!module_entry->set_has_default_read_edges()) {
5249 // We won a potential race
5250 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5251 }
5252 }
5253
5254 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5255
5256 if (!is_internal()) {
5257 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5258
5259 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5260 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5261 log_is_enabled(Info, class, preview)) {
5262 ResourceMark rm;
5263 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5264 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5265 }
5266
5267 if (log_is_enabled(Debug, class, resolve)) {
5268 ResourceMark rm;
5269 // print out the superclass.
5270 const char * from = ik->external_name();
5271 if (ik->super() != nullptr) {
5272 log_debug(class, resolve)("%s %s (super)",
5273 from,
5316 const ClassLoadInfo* cl_info,
5317 Publicity pub_level,
5318 TRAPS) :
5319 _stream(stream),
5320 _class_name(nullptr),
5321 _loader_data(loader_data),
5322 _is_hidden(cl_info->is_hidden()),
5323 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5324 _orig_cp_size(0),
5325 _static_oop_count(0),
5326 _super_klass(),
5327 _cp(nullptr),
5328 _fieldinfo_stream(nullptr),
5329 _fieldinfo_search_table(nullptr),
5330 _fields_status(nullptr),
5331 _methods(nullptr),
5332 _inner_classes(nullptr),
5333 _nest_members(nullptr),
5334 _nest_host(0),
5335 _permitted_subclasses(nullptr),
5336 _record_components(nullptr),
5337 _local_interfaces(nullptr),
5338 _transitive_interfaces(nullptr),
5339 _combined_annotations(nullptr),
5340 _class_annotations(nullptr),
5341 _class_type_annotations(nullptr),
5342 _fields_annotations(nullptr),
5343 _fields_type_annotations(nullptr),
5344 _klass(nullptr),
5345 _klass_to_deallocate(nullptr),
5346 _parsed_annotations(nullptr),
5347 _field_info(nullptr),
5348 _temp_field_info(nullptr),
5349 _method_ordering(nullptr),
5350 _all_mirandas(nullptr),
5351 _vtable_size(0),
5352 _itable_size(0),
5353 _num_miranda_methods(0),
5354 _protection_domain(cl_info->protection_domain()),
5355 _access_flags(),
5356 _pub_level(pub_level),
5357 _bad_constant_seen(0),
5358 _synthetic_flag(false),
5359 _sde_length(false),
5360 _sde_buffer(nullptr),
5361 _sourcefile_index(0),
5362 _generic_signature_index(0),
5363 _major_version(0),
5364 _minor_version(0),
5365 _this_class_index(0),
5366 _super_class_index(0),
5367 _itfs_len(0),
5368 _java_fields_count(0),
5369 _need_verify(false),
5370 _has_nonstatic_concrete_methods(false),
5371 _declares_nonstatic_concrete_methods(false),
5372 _has_localvariable_table(false),
5373 _has_final_method(false),
5374 _has_contended_fields(false),
5375 _has_aot_runtime_setup_method(false),
5376 _has_finalizer(false),
5377 _has_empty_finalizer(false),
5378 _max_bootstrap_specifier_index(-1) {
5379
5380 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5381 _class_name->increment_refcount();
5382
5383 assert(_loader_data != nullptr, "invariant");
5384 assert(stream != nullptr, "invariant");
5385 assert(_stream != nullptr, "invariant");
5386 assert(_stream->buffer() == _stream->current(), "invariant");
5387 assert(_class_name != nullptr, "invariant");
5388 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5389
5390 // Figure out whether we can skip format checking (matching classic VM behavior)
5391 // Always verify CFLH bytes from the user agents.
5392 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5393
5394 // synch back verification state to stream to check for truncation.
5395 stream->set_need_verify(_need_verify);
5396
5397 parse_stream(stream, CHECK);
5398
5399 post_process_parsed_stream(stream, _cp, CHECK);
5400 }
5401
5402 void ClassFileParser::clear_class_metadata() {
5403 // metadata created before the instance klass is created. Must be
5404 // deallocated if classfile parsing returns an error.
5405 _cp = nullptr;
5406 _fieldinfo_stream = nullptr;
5407 _fieldinfo_search_table = nullptr;
5408 _fields_status = nullptr;
5409 _methods = nullptr;
5410 _inner_classes = nullptr;
5411 _nest_members = nullptr;
5412 _permitted_subclasses = nullptr;
5413 _combined_annotations = nullptr;
5414 _class_annotations = _class_type_annotations = nullptr;
5415 _fields_annotations = _fields_type_annotations = nullptr;
5416 _record_components = nullptr;
5417 }
5418
5419 // Destructor to clean up
5420 ClassFileParser::~ClassFileParser() {
5421 _class_name->decrement_refcount();
5422
5423 if (_cp != nullptr) {
5424 MetadataFactory::free_metadata(_loader_data, _cp);
5425 }
5426
5427 if (_fieldinfo_stream != nullptr) {
5428 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5429 }
5430 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5431
5432 if (_fields_status != nullptr) {
5433 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5434 }
5435
5436 if (_methods != nullptr) {
5437 // Free methods
5438 InstanceKlass::deallocate_methods(_loader_data, _methods);
5439 }
5440
5441 // beware of the Universe::empty_blah_array!!
5442 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5443 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5444 }
5445
5446 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5447 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5448 }
5449
5450 if (_record_components != nullptr) {
5451 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5452 }
5453
5454 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5455 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5456 }
5457
5458 // Free interfaces
5459 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5460 _local_interfaces, _transitive_interfaces);
5461
5462 if (_combined_annotations != nullptr) {
5463 // After all annotations arrays have been created, they are installed into the
5464 // Annotations object that will be assigned to the InstanceKlass being created.
5465
5466 // Deallocate the Annotations object and the installed annotations arrays.
5467 _combined_annotations->deallocate_contents(_loader_data);
5468
5469 // If the _combined_annotations pointer is non-null,
5470 // then the other annotations fields should have been cleared.
5471 assert(_class_annotations == nullptr, "Should have been cleared");
5472 assert(_class_type_annotations == nullptr, "Should have been cleared");
5473 assert(_fields_annotations == nullptr, "Should have been cleared");
5474 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5475 } else {
5476 // If the annotations arrays were not installed into the Annotations object,
5477 // then they have to be deallocated explicitly.
5536
5537 assert(cp_size == (u2)cp->length(), "invariant");
5538
5539 // ACCESS FLAGS
5540 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5541
5542 // Access flags
5543 u2 flags;
5544 // JVM_ACC_MODULE is defined in JDK-9 and later.
5545 if (_major_version >= JAVA_9_VERSION) {
5546 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5547 } else {
5548 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5549 }
5550
5551 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5552 // Set abstract bit for old class files for backward compatibility
5553 flags |= JVM_ACC_ABSTRACT;
5554 }
5555
5556 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5557
5558 short bad_constant = class_bad_constant_seen();
5559 if (bad_constant != 0) {
5560 // Do not throw CFE until after the access_flags are checked because if
5561 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5562 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5563 return;
5564 }
5565
5566 _access_flags.set_flags(flags);
5567
5568 // This class and superclass
5569 _this_class_index = stream->get_u2_fast();
5570 guarantee_property(
5571 valid_cp_range(_this_class_index, cp_size) &&
5572 cp->tag_at(_this_class_index).is_unresolved_klass(),
5573 "Invalid this class index %u in constant pool in class file %s",
5574 _this_class_index, CHECK);
5575
5639 }
5640 ls.cr();
5641 }
5642 }
5643
5644 // SUPERKLASS
5645 _super_class_index = stream->get_u2_fast();
5646 check_super_class(cp,
5647 _super_class_index,
5648 _need_verify,
5649 CHECK);
5650
5651 // Interfaces
5652 _itfs_len = stream->get_u2_fast();
5653 parse_interfaces(stream,
5654 _itfs_len,
5655 cp,
5656 &_has_nonstatic_concrete_methods,
5657 CHECK);
5658
5659 assert(_local_interfaces != nullptr, "invariant");
5660
5661 // Fields (offsets are filled in later)
5662 parse_fields(stream,
5663 _access_flags.is_interface(),
5664 cp,
5665 cp_size,
5666 &_java_fields_count,
5667 CHECK);
5668
5669 assert(_temp_field_info != nullptr, "invariant");
5670
5671 // Methods
5672 parse_methods(stream,
5673 _access_flags.is_interface(),
5674 &_has_localvariable_table,
5675 &_has_final_method,
5676 &_declares_nonstatic_concrete_methods,
5677 CHECK);
5678
5679 assert(_methods != nullptr, "invariant");
5680
5681 if (_declares_nonstatic_concrete_methods) {
5682 _has_nonstatic_concrete_methods = true;
5683 }
5684
5685 // Additional attributes/annotations
5686 _parsed_annotations = new ClassAnnotationCollector();
5687 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5688
5689 assert(_inner_classes != nullptr, "invariant");
5690
5691 // Finalize the Annotations metadata object,
5692 // now that all annotation arrays have been created.
5693 create_combined_annotations(CHECK);
5741 }
5742
5743 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5744 ConstantPool* cp,
5745 TRAPS) {
5746 assert(stream != nullptr, "invariant");
5747 assert(stream->at_eos(), "invariant");
5748 assert(cp != nullptr, "invariant");
5749 assert(_loader_data != nullptr, "invariant");
5750
5751 if (_class_name == vmSymbols::java_lang_Object()) {
5752 precond(_super_class_index == 0);
5753 precond(_super_klass == nullptr);
5754 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5755 "java.lang.Object cannot implement an interface in class file %s",
5756 CHECK);
5757 } else {
5758 // Set _super_klass after class file is parsed and format is checked
5759 assert(_super_class_index > 0, "any class other than Object must have a super class");
5760 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5761 if (_access_flags.is_interface()) {
5762 // Before attempting to resolve the superclass, check for class format
5763 // errors not checked yet.
5764 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5765 "Interfaces must have java.lang.Object as superclass in class file %s",
5766 CHECK);
5767 }
5768 Handle loader(THREAD, _loader_data->class_loader());
5769 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5770 // fast path to avoid lookup
5771 _super_klass = vmClasses::Object_klass();
5772 } else {
5773 _super_klass = (const InstanceKlass*)
5774 SystemDictionary::resolve_super_or_fail(_class_name,
5775 super_class_name,
5776 loader,
5777 true,
5778 CHECK);
5779 }
5780 }
5781
5782 if (_super_klass != nullptr) {
5783 if (_super_klass->has_nonstatic_concrete_methods()) {
5784 _has_nonstatic_concrete_methods = true;
5785 }
5786
5787 if (_super_klass->is_interface()) {
5788 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5789 return;
5790 }
5791 }
5792
5793 // Compute the transitive list of all unique interfaces implemented by this class
5794 _transitive_interfaces =
5795 compute_transitive_interfaces(_super_klass,
5796 _local_interfaces,
5797 _loader_data,
5798 CHECK);
5799
5800 assert(_transitive_interfaces != nullptr, "invariant");
5801
5802 // sort methods
5803 _method_ordering = sort_methods(_methods);
5804
5805 _all_mirandas = new GrowableArray<Method*>(20);
5806
5807 Handle loader(THREAD, _loader_data->class_loader());
5808 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5809 &_num_miranda_methods,
5810 _all_mirandas,
5811 _super_klass,
5812 _methods,
5813 _access_flags,
5814 _major_version,
5815 loader,
5816 _class_name,
5817 _local_interfaces);
5818
5819 // Size of Java itable (in words)
5820 _itable_size = _access_flags.is_interface() ? 0 :
5821 klassItable::compute_itable_size(_transitive_interfaces);
5822
5823 assert(_parsed_annotations != nullptr, "invariant");
5824
5825 _field_info = new FieldLayoutInfo();
5826 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5827 _parsed_annotations->is_contended(), _field_info);
5828 lb.build_layout();
5829
5830 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5831 _fieldinfo_stream =
5832 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5833 injected_fields_count, loader_data(), CHECK);
5834 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
5835 _fields_status =
5836 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5837 FieldStatus(0), CHECK);
5838 }
5839
5840 void ClassFileParser::set_klass(InstanceKlass* klass) {
5841
5842 #ifdef ASSERT
5843 if (klass != nullptr) {
5844 assert(nullptr == _klass, "leaking?");
5845 }
5846 #endif
5847
5848 _klass = klass;
5849 }
5850
5851 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5852
5853 #ifdef ASSERT
5854 if (klass != nullptr) {
5855 assert(nullptr == _klass_to_deallocate, "leaking?");
5856 }
5857 #endif
|
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 #include "cds/cdsConfig.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/classLoadInfo.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/fieldLayoutBuilder.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "jvm.h"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldInfo.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/inlineKlass.inline.hpp"
55 #include "oops/instanceKlass.inline.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/klass.inline.hpp"
58 #include "oops/klassVtable.hpp"
59 #include "oops/metadata.hpp"
60 #include "oops/method.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/symbol.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/jvmtiThreadState.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/fieldDescriptor.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/os.hpp"
71 #include "runtime/perfData.hpp"
72 #include "runtime/reflection.hpp"
73 #include "runtime/safepointVerifiers.hpp"
74 #include "runtime/signature.hpp"
75 #include "runtime/timer.hpp"
76 #include "services/classLoadingService.hpp"
77 #include "services/threadService.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/bitMap.inline.hpp"
80 #include "utilities/checkedCast.hpp"
81 #include "utilities/copy.hpp"
82 #include "utilities/exceptions.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/globalDefinitions.hpp"
85 #include "utilities/growableArray.hpp"
86 #include "utilities/hashTable.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/stringUtils.hpp"
90 #include "utilities/utf8.hpp"
91 #if INCLUDE_CDS
92 #include "classfile/systemDictionaryShared.hpp"
93 #endif
94 #if INCLUDE_JFR
95 #include "jfr/support/jfrTraceIdExtension.hpp"
96 #endif
97
98 // We generally try to create the oops directly when parsing, rather than
99 // allocating temporary data structures and copying the bytes twice. A
100 // temporary area is only needed when parsing utf8 entries in the constant
101 // pool and when parsing line number tables.
102
103 // We add assert in debug mode when class format is not checked.
104
105 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
106 #define JAVA_MIN_SUPPORTED_VERSION 45
107 #define JAVA_PREVIEW_MINOR_VERSION 65535
108
109 // Used for two backward compatibility reasons:
142 #define JAVA_17_VERSION 61
143
144 #define JAVA_18_VERSION 62
145
146 #define JAVA_19_VERSION 63
147
148 #define JAVA_20_VERSION 64
149
150 #define JAVA_21_VERSION 65
151
152 #define JAVA_22_VERSION 66
153
154 #define JAVA_23_VERSION 67
155
156 #define JAVA_24_VERSION 68
157
158 #define JAVA_25_VERSION 69
159
160 #define JAVA_26_VERSION 70
161
162 #define CONSTANT_CLASS_DESCRIPTORS 70
163
164 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
165 assert((bad_constant == JVM_CONSTANT_Module ||
166 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
167 "Unexpected bad constant pool entry");
168 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
169 }
170
171 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
172 ConstantPool* cp,
173 const int length,
174 TRAPS) {
175 assert(stream != nullptr, "invariant");
176 assert(cp != nullptr, "invariant");
177
178 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
179 // this function (_current can be allocated in a register, with scalar
180 // replacement of aggregates). The _current pointer is copied back to
181 // stream() when this function returns. DON'T call another method within
182 // this method that uses stream().
183 const ClassFileStream cfs1 = *stream;
184 const ClassFileStream* const cfs = &cfs1;
185
186 DEBUG_ONLY(const u1* const old_current = stream->current();)
187
188 // Used for batching symbol allocations.
189 const char* names[SymbolTable::symbol_alloc_batch_size];
190 int lengths[SymbolTable::symbol_alloc_batch_size];
191 int indices[SymbolTable::symbol_alloc_batch_size];
192 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
193 int names_count = 0;
194
195 // parsing Index 0 is unused
196 for (int index = 1; index < length; index++) {
197 // Each of the following case guarantees one more byte in the stream
198 // for the following tag or the access_flags following constant pool,
199 // so we don't need bounds-check for reading tag.
200 const u1 tag = cfs->get_u1_fast();
201 switch (tag) {
202 case JVM_CONSTANT_Class: {
203 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
204 const u2 name_index = cfs->get_u2_fast();
205 cp->klass_index_at_put(index, name_index);
206 break;
207 }
208 case JVM_CONSTANT_Fieldref: {
209 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
210 const u2 class_index = cfs->get_u2_fast();
211 const u2 name_and_type_index = cfs->get_u2_fast();
212 cp->field_at_put(index, class_index, name_and_type_index);
213 break;
214 }
215 case JVM_CONSTANT_Methodref: {
216 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
217 const u2 class_index = cfs->get_u2_fast();
218 const u2 name_and_type_index = cfs->get_u2_fast();
219 cp->method_at_put(index, class_index, name_and_type_index);
220 break;
221 }
222 case JVM_CONSTANT_InterfaceMethodref: {
486 guarantee_property(valid_symbol_at(name_ref_index),
487 "Invalid constant pool index %u in class file %s",
488 name_ref_index, CHECK);
489 guarantee_property(valid_symbol_at(signature_ref_index),
490 "Invalid constant pool index %u in class file %s",
491 signature_ref_index, CHECK);
492 break;
493 }
494 case JVM_CONSTANT_Utf8:
495 break;
496 case JVM_CONSTANT_UnresolvedClass: // fall-through
497 case JVM_CONSTANT_UnresolvedClassInError: {
498 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
499 break;
500 }
501 case JVM_CONSTANT_ClassIndex: {
502 const int class_index = cp->klass_index_at(index);
503 guarantee_property(valid_symbol_at(class_index),
504 "Invalid constant pool index %u in class file %s",
505 class_index, CHECK);
506
507 Symbol* const name = cp->symbol_at(class_index);
508 const unsigned int name_len = name->utf8_length();
509 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
510 break;
511 }
512 case JVM_CONSTANT_StringIndex: {
513 const int string_index = cp->string_index_at(index);
514 guarantee_property(valid_symbol_at(string_index),
515 "Invalid constant pool index %u in class file %s",
516 string_index, CHECK);
517 Symbol* const sym = cp->symbol_at(string_index);
518 cp->unresolved_string_at_put(index, sym);
519 break;
520 }
521 case JVM_CONSTANT_MethodHandle: {
522 const int ref_index = cp->method_handle_index_at(index);
523 guarantee_property(valid_cp_range(ref_index, length),
524 "Invalid constant pool index %u in class file %s",
525 ref_index, CHECK);
526 const constantTag tag = cp->tag_at(ref_index);
527 const int ref_kind = cp->method_handle_ref_kind_at(index);
528
698 }
699 }
700 } else {
701 if (_need_verify) {
702 // Method name and signature are individually verified above, when iterating
703 // NameAndType_info. Need to check here that signature is non-zero length and
704 // the right type.
705 if (!Signature::is_method(signature)) {
706 throwIllegalSignature("Method", name, signature, CHECK);
707 }
708 }
709 // If a class method name begins with '<', it must be "<init>" and have void signature.
710 const unsigned int name_len = name->utf8_length();
711 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
712 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
713 if (name != vmSymbols::object_initializer_name()) {
714 classfile_parse_error(
715 "Bad method name at constant pool index %u in class file %s",
716 name_ref_index, THREAD);
717 return;
718 } else if (!Signature::is_void_method(signature)) { // must have void signature.
719 throwIllegalSignature("Method", name, signature, CHECK);
720 }
721 }
722 }
723 break;
724 }
725 case JVM_CONSTANT_MethodHandle: {
726 const int ref_index = cp->method_handle_index_at(index);
727 const int ref_kind = cp->method_handle_ref_kind_at(index);
728 switch (ref_kind) {
729 case JVM_REF_invokeVirtual:
730 case JVM_REF_invokeStatic:
731 case JVM_REF_invokeSpecial:
732 case JVM_REF_newInvokeSpecial: {
733 const int name_and_type_ref_index =
734 cp->uncached_name_and_type_ref_index_at(ref_index);
735 const int name_ref_index =
736 cp->name_ref_index_at(name_and_type_ref_index);
737 const Symbol* const name = cp->symbol_at(name_ref_index);
738
739 if (name != vmSymbols::object_initializer_name()) { // !<init>
740 if (ref_kind == JVM_REF_newInvokeSpecial) {
741 classfile_parse_error(
742 "Bad constructor name at constant pool index %u in class file %s",
743 name_ref_index, THREAD);
744 return;
745 }
746 } else { // <init>
747 // The allowed invocation mode of <init> depends on its signature.
748 // This test corresponds to verify_invoke_instructions in the verifier.
749 const int signature_ref_index =
750 cp->signature_ref_index_at(name_and_type_ref_index);
751 const Symbol* const signature = cp->symbol_at(signature_ref_index);
752 if (signature->is_void_method_signature()
753 && ref_kind == JVM_REF_newInvokeSpecial) {
754 // OK, could be a constructor call
755 } else {
756 classfile_parse_error(
757 "Bad method name at constant pool index %u in class file %s",
758 name_ref_index, THREAD);
759 return;
760 }
761 }
762 break;
763 }
764 // Other ref_kinds are already fully checked in previous pass.
765 } // switch(ref_kind)
766 break;
767 }
768 case JVM_CONSTANT_MethodType: {
769 const Symbol* const no_name = vmSymbols::type_name(); // place holder
770 const Symbol* const signature = cp->method_type_signature_at(index);
771 verify_legal_method_signature(no_name, signature, CHECK);
772 break;
773 }
774 case JVM_CONSTANT_Utf8: {
775 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
787
788 NameSigHash(Symbol* name, Symbol* sig) :
789 _name(name),
790 _sig(sig) {}
791
792 static unsigned int hash(NameSigHash const& namesig) {
793 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
794 }
795
796 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
797 return (e0._name == e1._name) &&
798 (e0._sig == e1._sig);
799 }
800 };
801
802 using NameSigHashtable = HashTable<NameSigHash, int,
803 NameSigHash::HASH_ROW_SIZE,
804 AnyObj::RESOURCE_AREA, mtInternal,
805 &NameSigHash::hash, &NameSigHash::equals>;
806
807 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
808 assert(super_type != nullptr,"Method doesn't support null super type");
809 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
810 && super_type->name() != vmSymbols::java_lang_Object()) {
811 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
812 err_msg("Value type %s has an identity type as supertype",
813 current->class_name()->as_klass_external_name()));
814 }
815 }
816
817 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
818 int itfs_len,
819 ConstantPool* cp,
820 bool* const has_nonstatic_concrete_methods,
821 // FIXME: lots of these functions
822 // declare their parameters as const,
823 // which adds only noise to the code.
824 // Remove the spurious const modifiers.
825 // Many are of the form "const int x"
826 // or "T* const x".
827 TRAPS) {
828 assert(stream != nullptr, "invariant");
829 assert(cp != nullptr, "invariant");
830 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
831
832 if (itfs_len == 0) {
833 _local_interfaces = Universe::the_empty_instance_klass_array();
834
835 } else {
836 assert(itfs_len > 0, "only called for len>0");
837 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
838 int index = 0;
839 for (index = 0; index < itfs_len; index++) {
840 const u2 interface_index = stream->get_u2(CHECK);
841 guarantee_property(
842 valid_klass_reference_at(interface_index),
843 "Interface name has bad constant pool index %u in class file %s",
844 interface_index, CHECK);
845 _local_interface_indexes->at_put_grow(index, interface_index);
846 }
847
848 if (!_need_verify || itfs_len <= 1) {
849 return;
850 }
851
852 // Check if there's any duplicates in interfaces
853 ResourceMark rm(THREAD);
854 // Set containing interface names
855 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
856 for (index = 0; index < itfs_len; index++) {
857 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
858 // If no duplicates, add (name, nullptr) in hashtable interface_names.
859 if (!interface_names->put(interface_name, 0)) {
860 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
861 interface_name->as_C_string(), THREAD);
862 return;
863 }
864 }
865 }
866 }
867
868 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
869 int constantvalue_index,
870 int signature_index,
871 TRAPS) const {
872 // Make sure the constant pool entry is of a type appropriate to this field
873 guarantee_property(
874 (constantvalue_index > 0 &&
875 constantvalue_index < cp->length()),
876 "Bad initial value index %u in ConstantValue attribute in class file %s",
877 constantvalue_index, CHECK);
924 class AnnotationCollector : public ResourceObj{
925 public:
926 enum Location { _in_field, _in_method, _in_class };
927 enum ID {
928 _unknown = 0,
929 _method_CallerSensitive,
930 _method_ForceInline,
931 _method_DontInline,
932 _method_ChangesCurrentThread,
933 _method_JvmtiHideEvents,
934 _method_JvmtiMountTransition,
935 _method_InjectedProfile,
936 _method_LambdaForm_Compiled,
937 _method_Hidden,
938 _method_Scoped,
939 _method_IntrinsicCandidate,
940 _jdk_internal_vm_annotation_Contended,
941 _field_Stable,
942 _jdk_internal_vm_annotation_ReservedStackAccess,
943 _jdk_internal_ValueBased,
944 _jdk_internal_LooselyConsistentValue,
945 _jdk_internal_NullRestricted,
946 _java_lang_Deprecated,
947 _java_lang_Deprecated_for_removal,
948 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
949 _method_AOTRuntimeSetup,
950 _annotation_LIMIT
951 };
952 const Location _location;
953 int _annotations_present;
954 u2 _contended_group;
955
956 AnnotationCollector(Location location)
957 : _location(location), _annotations_present(0), _contended_group(0)
958 {
959 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
960 }
961 // If this annotation name has an ID, report it (or _none).
962 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
963 // Set the annotation name:
964 void set_annotation(ID id) {
965 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1352 }
1353
1354 *constantvalue_index_addr = constantvalue_index;
1355 *is_synthetic_addr = is_synthetic;
1356 *generic_signature_index_addr = generic_signature_index;
1357 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1358 runtime_visible_annotations_length,
1359 CHECK);
1360 parsed_annotations->set_field_annotations(a);
1361 a = allocate_annotations(runtime_visible_type_annotations,
1362 runtime_visible_type_annotations_length,
1363 CHECK);
1364 parsed_annotations->set_field_type_annotations(a);
1365 return;
1366 }
1367
1368
1369 // Side-effects: populates the _fields, _fields_annotations,
1370 // _fields_type_annotations fields
1371 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1372 AccessFlags class_access_flags,
1373 ConstantPool* cp,
1374 const int cp_size,
1375 u2* const java_fields_count_ptr,
1376 TRAPS) {
1377
1378 assert(cfs != nullptr, "invariant");
1379 assert(cp != nullptr, "invariant");
1380 assert(java_fields_count_ptr != nullptr, "invariant");
1381
1382 assert(nullptr == _fields_annotations, "invariant");
1383 assert(nullptr == _fields_type_annotations, "invariant");
1384
1385 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1386 cfs->guarantee_more(2, CHECK); // length
1387 const u2 length = cfs->get_u2_fast();
1388 *java_fields_count_ptr = length;
1389
1390 int num_injected = 0;
1391 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1392 &num_injected);
1393
1394 // two more slots are required for inline classes:
1395 // one for the static field with a reference to the pre-allocated default value
1396 // one for the field the JVM injects when detecting an empty inline class
1397 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1398
1399 // Allocate a temporary resource array to collect field data.
1400 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1401 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1402
1403 int instance_fields_count = 0;
1404 ResourceMark rm(THREAD);
1405 for (int n = 0; n < length; n++) {
1406 // access_flags, name_index, descriptor_index, attributes_count
1407 cfs->guarantee_more(8, CHECK);
1408
1409 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1410 if (!supports_inline_types()) {
1411 recognized_modifiers &= ~JVM_ACC_STRICT;
1412 }
1413
1414 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1415 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1416 AccessFlags access_flags;
1417 access_flags.set_flags(flags);
1418 FieldInfo::FieldFlags fieldFlags(0);
1419
1420 const u2 name_index = cfs->get_u2_fast();
1421 guarantee_property(valid_symbol_at(name_index),
1422 "Invalid constant pool index %u for field name in class file %s",
1423 name_index, CHECK);
1424 const Symbol* const name = cp->symbol_at(name_index);
1425 verify_legal_field_name(name, CHECK);
1426
1427 const u2 signature_index = cfs->get_u2_fast();
1428 guarantee_property(valid_symbol_at(signature_index),
1429 "Invalid constant pool index %u for field signature in class file %s",
1430 signature_index, CHECK);
1431 const Symbol* const sig = cp->symbol_at(signature_index);
1432 verify_legal_field_signature(name, sig, CHECK);
1433 if (!access_flags.is_static()) instance_fields_count++;
1434
1435 u2 constantvalue_index = 0;
1436 bool is_synthetic = false;
1437 u2 generic_signature_index = 0;
1438 const bool is_static = access_flags.is_static();
1439 FieldAnnotationCollector parsed_annotations(_loader_data);
1440
1441 bool is_null_restricted = false;
1442
1443 const u2 attributes_count = cfs->get_u2_fast();
1444 if (attributes_count > 0) {
1445 parse_field_attributes(cfs,
1446 attributes_count,
1447 is_static,
1448 signature_index,
1449 &constantvalue_index,
1450 &is_synthetic,
1451 &generic_signature_index,
1452 &parsed_annotations,
1453 CHECK);
1454
1455 if (parsed_annotations.field_annotations() != nullptr) {
1456 if (_fields_annotations == nullptr) {
1457 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1458 _loader_data, length, nullptr,
1459 CHECK);
1460 }
1461 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1462 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1463 if (!Signature::has_envelope(sig)) {
1464 Exceptions::fthrow(
1465 THREAD_AND_LOCATION,
1466 vmSymbols::java_lang_ClassFormatError(),
1467 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1468 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1469 }
1470 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
1471 if (!is_strict) {
1472 Exceptions::fthrow(
1473 THREAD_AND_LOCATION,
1474 vmSymbols::java_lang_ClassFormatError(),
1475 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s which doesn't have the @jdk.internal.vm.annotation.Strict annotation",
1476 class_name()->as_C_string(), name->as_C_string());
1477 }
1478 is_null_restricted = true;
1479 }
1480 parsed_annotations.set_field_annotations(nullptr);
1481 }
1482 if (parsed_annotations.field_type_annotations() != nullptr) {
1483 if (_fields_type_annotations == nullptr) {
1484 _fields_type_annotations =
1485 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1486 length,
1487 nullptr,
1488 CHECK);
1489 }
1490 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1491 parsed_annotations.set_field_type_annotations(nullptr);
1492 }
1493
1494 if (is_synthetic) {
1495 access_flags.set_is_synthetic();
1496 }
1497 if (generic_signature_index != 0) {
1498 fieldFlags.update_generic(true);
1499 }
1500 }
1501
1502 if (is_null_restricted) {
1503 fieldFlags.update_null_free_inline_type(true);
1504 }
1505
1506 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1507
1508 // Update number of static oop fields.
1509 if (is_static && is_reference_type(type)) {
1510 _static_oop_count++;
1511 }
1512
1513 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1514 fi.set_index(n);
1515 if (fieldFlags.is_generic()) {
1516 fi.set_generic_signature_index(generic_signature_index);
1517 }
1518 parsed_annotations.apply_to(&fi);
1519 if (fi.field_flags().is_contended()) {
1520 _has_contended_fields = true;
1521 }
1522 if (access_flags.is_strict() && access_flags.is_static()) {
1523 _has_strict_static_fields = true;
1524 }
1525 _temp_field_info->append(fi);
1526 }
1527 assert(_temp_field_info->length() == length, "Must be");
1528
1529 if (num_injected != 0) {
1530 for (int n = 0; n < num_injected; n++) {
1531 // Check for duplicates
1532 if (injected[n].may_be_java) {
1533 const Symbol* const name = injected[n].name();
1534 const Symbol* const signature = injected[n].signature();
1535 bool duplicate = false;
1536 for (int i = 0; i < length; i++) {
1537 const FieldInfo* const f = _temp_field_info->adr_at(i);
1538 if (name == cp->symbol_at(f->name_index()) &&
1539 signature == cp->symbol_at(f->signature_index())) {
1540 // Symbol is desclared in Java so skip this one
1541 duplicate = true;
1542 break;
1543 }
1544 }
1545 if (duplicate) {
1546 // These will be removed from the field array at the end
1547 continue;
1548 }
1549 }
1550
1551 // Injected field
1552 FieldInfo::FieldFlags fflags(0);
1553 fflags.update_injected(true);
1554 AccessFlags aflags;
1555 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1556 int idx = _temp_field_info->append(fi);
1557 _temp_field_info->adr_at(idx)->set_index(idx);
1558 }
1559 }
1560
1561 if (is_inline_type) {
1562 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1563 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1564 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1565 // alive.
1566 FieldInfo::FieldFlags fflags2(0);
1567 fflags2.update_injected(true);
1568 AccessFlags aflags2(JVM_ACC_STATIC);
1569 FieldInfo fi2(aflags2,
1570 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1571 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1572 0,
1573 fflags2);
1574 int idx2 = _temp_field_info->append(fi2);
1575 _temp_field_info->adr_at(idx2)->set_index(idx2);
1576 _static_oop_count++;
1577 }
1578
1579 if (_need_verify && length > 1) {
1580 // Check duplicated fields
1581 ResourceMark rm(THREAD);
1582 // Set containing name-signature pairs
1583 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1584 for (int i = 0; i < _temp_field_info->length(); i++) {
1585 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1586 _temp_field_info->adr_at(i)->signature(_cp));
1587 // If no duplicates, add name/signature in hashtable names_and_sigs.
1588 if(!names_and_sigs->put(name_and_sig, 0)) {
1589 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1590 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1591 return;
1592 }
1593 }
1594 }
1595 }
1596
1597
1937 }
1938 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1939 if (_location != _in_field && _location != _in_class) {
1940 break; // only allow for fields and classes
1941 }
1942 if (!EnableContended || (RestrictContended && !privileged)) {
1943 break; // honor privileges
1944 }
1945 return _jdk_internal_vm_annotation_Contended;
1946 }
1947 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1948 if (_location != _in_method) break; // only allow for methods
1949 if (RestrictReservedStack && !privileged) break; // honor privileges
1950 return _jdk_internal_vm_annotation_ReservedStackAccess;
1951 }
1952 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1953 if (_location != _in_class) break; // only allow for classes
1954 if (!privileged) break; // only allow in privileged code
1955 return _jdk_internal_ValueBased;
1956 }
1957 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1958 if (_location != _in_class) break; // only allow for classes
1959 return _jdk_internal_LooselyConsistentValue;
1960 }
1961 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1962 if (_location != _in_field) break; // only allow for fields
1963 return _jdk_internal_NullRestricted;
1964 }
1965 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1966 return _java_lang_Deprecated;
1967 }
1968 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1969 if (_location != _in_class) break; // only allow for classes
1970 if (!privileged) break; // only allow in privileged code
1971 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1972 }
1973 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1974 if (_location != _in_method) break; // only allow for methods
1975 if (!privileged) break; // only allow in privileged code
1976 return _method_AOTRuntimeSetup;
1977 }
1978 default: {
1979 break;
1980 }
1981 }
1982 return AnnotationCollector::_unknown;
1983 }
1984
2181 }
2182
2183 if (runtime_visible_type_annotations_length > 0) {
2184 a = allocate_annotations(runtime_visible_type_annotations,
2185 runtime_visible_type_annotations_length,
2186 CHECK);
2187 cm->set_type_annotations(a);
2188 }
2189 }
2190
2191
2192 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2193 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2194 // Method* to save footprint, so we only know the size of the resulting Method* when the
2195 // entire method attribute is parsed.
2196 //
2197 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2198
2199 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2200 bool is_interface,
2201 bool is_value_class,
2202 bool is_abstract_class,
2203 const ConstantPool* cp,
2204 bool* const has_localvariable_table,
2205 TRAPS) {
2206 assert(cfs != nullptr, "invariant");
2207 assert(cp != nullptr, "invariant");
2208 assert(has_localvariable_table != nullptr, "invariant");
2209
2210 ResourceMark rm(THREAD);
2211 // Parse fixed parts:
2212 // access_flags, name_index, descriptor_index, attributes_count
2213 cfs->guarantee_more(8, CHECK_NULL);
2214
2215 u2 flags = cfs->get_u2_fast();
2216 const u2 name_index = cfs->get_u2_fast();
2217 const int cp_size = cp->length();
2218 guarantee_property(
2219 valid_symbol_at(name_index),
2220 "Illegal constant pool index %u for method name in class file %s",
2221 name_index, CHECK_NULL);
2222 const Symbol* const name = cp->symbol_at(name_index);
2224
2225 const u2 signature_index = cfs->get_u2_fast();
2226 guarantee_property(
2227 valid_symbol_at(signature_index),
2228 "Illegal constant pool index %u for method signature in class file %s",
2229 signature_index, CHECK_NULL);
2230 const Symbol* const signature = cp->symbol_at(signature_index);
2231
2232 if (name == vmSymbols::class_initializer_name()) {
2233 // We ignore the other access flags for a valid class initializer.
2234 // (JVM Spec 2nd ed., chapter 4.6)
2235 if (_major_version < 51) { // backward compatibility
2236 flags = JVM_ACC_STATIC;
2237 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2238 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2239 } else {
2240 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2241 return nullptr;
2242 }
2243 } else {
2244 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2245 }
2246
2247 if (name == vmSymbols::object_initializer_name() && is_interface) {
2248 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2249 return nullptr;
2250 }
2251
2252 if (EnableValhalla) {
2253 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2254 && ((flags & JVM_ACC_STATIC) == 0 )
2255 && !_access_flags.is_identity_class()) {
2256 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2257 return nullptr;
2258 }
2259 }
2260
2261 int args_size = -1; // only used when _need_verify is true
2262 if (_need_verify) {
2263 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2264 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2265 verify_legal_method_signature(name, signature, CHECK_NULL);
2266 if (args_size > MAX_ARGS_SIZE) {
2267 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2268 return nullptr;
2269 }
2270 }
2271
2272 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2273
2274 // Default values for code and exceptions attribute elements
2275 u2 max_stack = 0;
2276 u2 max_locals = 0;
2277 u4 code_length = 0;
2278 const u1* code_start = nullptr;
2279 u2 exception_table_length = 0;
2280 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2775 CHECK_NULL);
2776
2777 if (InstanceKlass::is_finalization_enabled() &&
2778 name == vmSymbols::finalize_method_name() &&
2779 signature == vmSymbols::void_method_signature()) {
2780 if (m->is_empty_method()) {
2781 _has_empty_finalizer = true;
2782 } else {
2783 _has_finalizer = true;
2784 }
2785 }
2786
2787 NOT_PRODUCT(m->verify());
2788 return m;
2789 }
2790
2791
2792 // Side-effects: populates the _methods field in the parser
2793 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2794 bool is_interface,
2795 bool is_value_class,
2796 bool is_abstract_type,
2797 bool* const has_localvariable_table,
2798 bool* has_final_method,
2799 bool* declares_nonstatic_concrete_methods,
2800 TRAPS) {
2801 assert(cfs != nullptr, "invariant");
2802 assert(has_localvariable_table != nullptr, "invariant");
2803 assert(has_final_method != nullptr, "invariant");
2804 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2805
2806 assert(nullptr == _methods, "invariant");
2807
2808 cfs->guarantee_more(2, CHECK); // length
2809 const u2 length = cfs->get_u2_fast();
2810 if (length == 0) {
2811 _methods = Universe::the_empty_method_array();
2812 } else {
2813 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2814 length,
2815 nullptr,
2816 CHECK);
2817
2818 for (int index = 0; index < length; index++) {
2819 Method* method = parse_method(cfs,
2820 is_interface,
2821 is_value_class,
2822 is_abstract_type,
2823 _cp,
2824 has_localvariable_table,
2825 CHECK);
2826
2827 if (method->is_final()) {
2828 *has_final_method = true;
2829 }
2830 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2831 // used for interface initialization, and default method inheritance analysis
2832 if (is_interface && !(*declares_nonstatic_concrete_methods)
2833 && !method->is_abstract() && !method->is_static()) {
2834 *declares_nonstatic_concrete_methods = true;
2835 }
2836 _methods->at_put(index, method);
2837 }
2838
2839 if (_need_verify && length > 1) {
2840 // Check duplicated methods
2841 ResourceMark rm(THREAD);
2842 // Set containing name-signature pairs
3068 valid_klass_reference_at(outer_class_info_index),
3069 "outer_class_info_index %u has bad constant type in class file %s",
3070 outer_class_info_index, CHECK_0);
3071
3072 if (outer_class_info_index != 0) {
3073 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3074 char* bytes = (char*)outer_class_name->bytes();
3075 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3076 "Outer class is an array class in class file %s", CHECK_0);
3077 }
3078 // Inner class name
3079 const u2 inner_name_index = cfs->get_u2_fast();
3080 guarantee_property(
3081 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3082 "inner_name_index %u has bad constant type in class file %s",
3083 inner_name_index, CHECK_0);
3084 if (_need_verify) {
3085 guarantee_property(inner_class_info_index != outer_class_info_index,
3086 "Class is both outer and inner class in class file %s", CHECK_0);
3087 }
3088
3089 // Access flags
3090 u2 flags;
3091 // JVM_ACC_MODULE is defined in JDK-9 and later.
3092 if (_major_version >= JAVA_9_VERSION) {
3093 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3094 } else {
3095 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3096 }
3097
3098 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3099 // Set abstract bit for old class files for backward compatibility
3100 flags |= JVM_ACC_ABSTRACT;
3101 }
3102
3103 if (!supports_inline_types()) {
3104 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3105 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3106 if (!is_module && !is_interface) {
3107 flags |= JVM_ACC_IDENTITY;
3108 }
3109 }
3110
3111 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3112 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3113 AccessFlags inner_access_flags(flags);
3114
3115 inner_classes->at_put(index++, inner_class_info_index);
3116 inner_classes->at_put(index++, outer_class_info_index);
3117 inner_classes->at_put(index++, inner_name_index);
3118 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3119 }
3120
3121 // Check for circular and duplicate entries.
3122 bool has_circularity = false;
3123 if (_need_verify) {
3124 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3125 if (has_circularity) {
3126 // If circularity check failed then ignore InnerClasses attribute.
3127 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3128 index = 0;
3129 if (parsed_enclosingmethod_attribute) {
3130 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3196 if (length > 0) {
3197 int index = 0;
3198 cfs->guarantee_more(2 * length, CHECK_0);
3199 for (int n = 0; n < length; n++) {
3200 const u2 class_info_index = cfs->get_u2_fast();
3201 guarantee_property(
3202 valid_klass_reference_at(class_info_index),
3203 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3204 class_info_index, CHECK_0);
3205 permitted_subclasses->at_put(index++, class_info_index);
3206 }
3207 assert(index == size, "wrong size");
3208 }
3209
3210 // Restore buffer's current position.
3211 cfs->set_current(current_mark);
3212
3213 return length;
3214 }
3215
3216 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3217 const u1* const loadable_descriptors_attribute_start,
3218 TRAPS) {
3219 const u1* const current_mark = cfs->current();
3220 u2 length = 0;
3221 if (loadable_descriptors_attribute_start != nullptr) {
3222 cfs->set_current(loadable_descriptors_attribute_start);
3223 cfs->guarantee_more(2, CHECK_0); // length
3224 length = cfs->get_u2_fast();
3225 }
3226 const int size = length;
3227 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3228 _loadable_descriptors = loadable_descriptors;
3229 if (length > 0) {
3230 int index = 0;
3231 cfs->guarantee_more(2 * length, CHECK_0);
3232 for (int n = 0; n < length; n++) {
3233 const u2 descriptor_index = cfs->get_u2_fast();
3234 guarantee_property(
3235 valid_symbol_at(descriptor_index),
3236 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3237 descriptor_index, CHECK_0);
3238 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3239 bool valid = legal_field_signature(descriptor, CHECK_0);
3240 if(!valid) {
3241 ResourceMark rm(THREAD);
3242 Exceptions::fthrow(THREAD_AND_LOCATION,
3243 vmSymbols::java_lang_ClassFormatError(),
3244 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3245 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3246 return 0;
3247 }
3248 loadable_descriptors->at_put(index++, descriptor_index);
3249 }
3250 assert(index == size, "wrong size");
3251 }
3252
3253 // Restore buffer's current position.
3254 cfs->set_current(current_mark);
3255
3256 return length;
3257 }
3258
3259 // Record {
3260 // u2 attribute_name_index;
3261 // u4 attribute_length;
3262 // u2 components_count;
3263 // component_info components[components_count];
3264 // }
3265 // component_info {
3266 // u2 name_index;
3267 // u2 descriptor_index
3268 // u2 attributes_count;
3269 // attribute_info_attributes[attributes_count];
3270 // }
3271 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3272 const ConstantPool* cp,
3273 const u1* const record_attribute_start,
3274 TRAPS) {
3275 const u1* const current_mark = cfs->current();
3276 int components_count = 0;
3277 unsigned int calculate_attr_size = 0;
3278 if (record_attribute_start != nullptr) {
3504 }
3505 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3506 "Bad length on BootstrapMethods in class file %s",
3507 CHECK);
3508 }
3509
3510 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3511 ConstantPool* cp,
3512 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3513 TRAPS) {
3514 assert(cfs != nullptr, "invariant");
3515 assert(cp != nullptr, "invariant");
3516 assert(parsed_annotations != nullptr, "invariant");
3517
3518 // Set inner classes attribute to default sentinel
3519 _inner_classes = Universe::the_empty_short_array();
3520 // Set nest members attribute to default sentinel
3521 _nest_members = Universe::the_empty_short_array();
3522 // Set _permitted_subclasses attribute to default sentinel
3523 _permitted_subclasses = Universe::the_empty_short_array();
3524 // Set _loadable_descriptors attribute to default sentinel
3525 _loadable_descriptors = Universe::the_empty_short_array();
3526 cfs->guarantee_more(2, CHECK); // attributes_count
3527 u2 attributes_count = cfs->get_u2_fast();
3528 bool parsed_sourcefile_attribute = false;
3529 bool parsed_innerclasses_attribute = false;
3530 bool parsed_nest_members_attribute = false;
3531 bool parsed_permitted_subclasses_attribute = false;
3532 bool parsed_loadable_descriptors_attribute = false;
3533 bool parsed_nest_host_attribute = false;
3534 bool parsed_record_attribute = false;
3535 bool parsed_enclosingmethod_attribute = false;
3536 bool parsed_bootstrap_methods_attribute = false;
3537 const u1* runtime_visible_annotations = nullptr;
3538 int runtime_visible_annotations_length = 0;
3539 const u1* runtime_visible_type_annotations = nullptr;
3540 int runtime_visible_type_annotations_length = 0;
3541 bool runtime_invisible_type_annotations_exists = false;
3542 bool runtime_invisible_annotations_exists = false;
3543 bool parsed_source_debug_ext_annotations_exist = false;
3544 const u1* inner_classes_attribute_start = nullptr;
3545 u4 inner_classes_attribute_length = 0;
3546 u2 enclosing_method_class_index = 0;
3547 u2 enclosing_method_method_index = 0;
3548 const u1* nest_members_attribute_start = nullptr;
3549 u4 nest_members_attribute_length = 0;
3550 const u1* record_attribute_start = nullptr;
3551 u4 record_attribute_length = 0;
3552 const u1* permitted_subclasses_attribute_start = nullptr;
3553 u4 permitted_subclasses_attribute_length = 0;
3554 const u1* loadable_descriptors_attribute_start = nullptr;
3555 u4 loadable_descriptors_attribute_length = 0;
3556
3557 // Iterate over attributes
3558 while (attributes_count--) {
3559 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3560 const u2 attribute_name_index = cfs->get_u2_fast();
3561 const u4 attribute_length = cfs->get_u4_fast();
3562 guarantee_property(
3563 valid_symbol_at(attribute_name_index),
3564 "Attribute name has bad constant pool index %u in class file %s",
3565 attribute_name_index, CHECK);
3566 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3567 if (tag == vmSymbols::tag_source_file()) {
3568 // Check for SourceFile tag
3569 if (_need_verify) {
3570 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3571 }
3572 if (parsed_sourcefile_attribute) {
3573 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3574 return;
3575 } else {
3751 return;
3752 }
3753 parsed_record_attribute = true;
3754 record_attribute_start = cfs->current();
3755 record_attribute_length = attribute_length;
3756 } else if (_major_version >= JAVA_17_VERSION) {
3757 if (tag == vmSymbols::tag_permitted_subclasses()) {
3758 if (parsed_permitted_subclasses_attribute) {
3759 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3760 return;
3761 }
3762 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3763 if (_access_flags.is_final()) {
3764 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3765 return;
3766 }
3767 parsed_permitted_subclasses_attribute = true;
3768 permitted_subclasses_attribute_start = cfs->current();
3769 permitted_subclasses_attribute_length = attribute_length;
3770 }
3771 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3772 if (parsed_loadable_descriptors_attribute) {
3773 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3774 return;
3775 }
3776 parsed_loadable_descriptors_attribute = true;
3777 loadable_descriptors_attribute_start = cfs->current();
3778 loadable_descriptors_attribute_length = attribute_length;
3779 }
3780 }
3781 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3782 cfs->skip_u1(attribute_length, CHECK);
3783 } else {
3784 // Unknown attribute
3785 cfs->skip_u1(attribute_length, CHECK);
3786 }
3787 } else {
3788 // Unknown attribute
3789 cfs->skip_u1(attribute_length, CHECK);
3790 }
3791 } else {
3792 // Unknown attribute
3793 cfs->skip_u1(attribute_length, CHECK);
3794 }
3795 }
3796 _class_annotations = allocate_annotations(runtime_visible_annotations,
3797 runtime_visible_annotations_length,
3798 CHECK);
3799 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3836 CHECK);
3837 if (_need_verify) {
3838 guarantee_property(record_attribute_length == calculated_attr_length,
3839 "Record attribute has wrong length in class file %s",
3840 CHECK);
3841 }
3842 }
3843
3844 if (parsed_permitted_subclasses_attribute) {
3845 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3846 cfs,
3847 permitted_subclasses_attribute_start,
3848 CHECK);
3849 if (_need_verify) {
3850 guarantee_property(
3851 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3852 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3853 }
3854 }
3855
3856 if (parsed_loadable_descriptors_attribute) {
3857 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3858 cfs,
3859 loadable_descriptors_attribute_start,
3860 CHECK);
3861 if (_need_verify) {
3862 guarantee_property(
3863 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3864 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3865 }
3866 }
3867
3868 if (_max_bootstrap_specifier_index >= 0) {
3869 guarantee_property(parsed_bootstrap_methods_attribute,
3870 "Missing BootstrapMethods attribute in class file %s", CHECK);
3871 }
3872 }
3873
3874 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3875 assert(k != nullptr, "invariant");
3876
3877 if (_synthetic_flag)
3878 k->set_is_synthetic();
3879 if (_sourcefile_index != 0) {
3880 k->set_source_file_name_index(_sourcefile_index);
3881 }
3882 if (_generic_signature_index != 0) {
3883 k->set_generic_signature_index(_generic_signature_index);
3884 }
3885 if (_sde_buffer != nullptr) {
3886 k->set_source_debug_extension(_sde_buffer, _sde_length);
3887 }
3914 _class_type_annotations = nullptr;
3915 _fields_annotations = nullptr;
3916 _fields_type_annotations = nullptr;
3917 }
3918
3919 // Transfer ownership of metadata allocated to the InstanceKlass.
3920 void ClassFileParser::apply_parsed_class_metadata(
3921 InstanceKlass* this_klass,
3922 int java_fields_count) {
3923 assert(this_klass != nullptr, "invariant");
3924
3925 _cp->set_pool_holder(this_klass);
3926 this_klass->set_constants(_cp);
3927 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3928 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3929 this_klass->set_fields_status(_fields_status);
3930 this_klass->set_methods(_methods);
3931 this_klass->set_inner_classes(_inner_classes);
3932 this_klass->set_nest_members(_nest_members);
3933 this_klass->set_nest_host_index(_nest_host);
3934 this_klass->set_loadable_descriptors(_loadable_descriptors);
3935 this_klass->set_annotations(_combined_annotations);
3936 this_klass->set_permitted_subclasses(_permitted_subclasses);
3937 this_klass->set_record_components(_record_components);
3938 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3939
3940 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3941
3942 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3943 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3944 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3945 // its _super. If an OOM occurs while loading the current klass, its _super field
3946 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3947 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3948 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3949
3950 // Clear out these fields so they don't get deallocated by the destructor
3951 clear_class_metadata();
3952 }
3953
3954 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3955 int anno_length,
3956 TRAPS) {
3957 AnnotationArray* annotations = nullptr;
3958 if (anno != nullptr) {
3959 annotations = MetadataFactory::new_array<u1>(_loader_data,
3960 anno_length,
3961 CHECK_(annotations));
3962 for (int i = 0; i < anno_length; i++) {
3963 annotations->at_put(i, anno[i]);
3964 }
3965 }
3966 return annotations;
3967 }
3968
3969 void ClassFileParser::check_super_class(ConstantPool* const cp,
3970 const int super_class_index,
3971 const bool need_verify,
3972 TRAPS) {
3973 assert(cp != nullptr, "invariant");
3974
3975 if (super_class_index == 0) {
3976 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3977 "Invalid superclass index 0 in class file %s",
3978 CHECK);
3979 } else {
3980 guarantee_property(valid_klass_reference_at(super_class_index),
3981 "Invalid superclass index %u in class file %s",
3982 super_class_index,
3983 CHECK);
3984
3985 // The class name should be legal because it is checked when parsing constant pool.
3986 // However, make sure it is not an array type.
3987 if (need_verify) {
3988 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3989 "Bad superclass name in class file %s", CHECK);
3990 }
3991 }
3992 }
3993
3994 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3995 _max_nonstatic_oop_maps = max_blocks;
3996 _nonstatic_oop_map_count = 0;
3997 if (max_blocks == 0) {
4149 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4150 assert(ik->size_helper() > 0, "layout_helper is initialized");
4151 if (ik->is_abstract() || ik->is_interface()
4152 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4153 || ik->size_helper() >= FastAllocateSizeLimit) {
4154 // Forbid fast-path allocation.
4155 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4156 ik->set_layout_helper(lh);
4157 }
4158
4159 // Propagate the AOT runtimeSetup method discovery
4160 if (_has_aot_runtime_setup_method) {
4161 ik->set_is_runtime_setup_required();
4162 if (log_is_enabled(Info, aot, init)) {
4163 ResourceMark rm;
4164 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4165 }
4166 }
4167 }
4168
4169 bool ClassFileParser::supports_inline_types() const {
4170 // Inline types are only supported by class file version 70.65535 and later
4171 return _major_version > JAVA_26_VERSION ||
4172 (_major_version == JAVA_26_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4173 }
4174
4175 // utility methods for appending an array with check for duplicates
4176
4177 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4178 const Array<InstanceKlass*>* const ifs) {
4179 // iterate over new interfaces
4180 for (int i = 0; i < ifs->length(); i++) {
4181 InstanceKlass* const e = ifs->at(i);
4182 assert(e->is_klass() && e->is_interface(), "just checking");
4183 // add new interface
4184 result->append_if_missing(e);
4185 }
4186 }
4187
4188 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4189 Array<InstanceKlass*>* local_ifs,
4190 ClassLoaderData* loader_data,
4191 TRAPS) {
4192 assert(local_ifs != nullptr, "invariant");
4193 assert(loader_data != nullptr, "invariant");
4194
4198 // Add superclass transitive interfaces size
4199 if (super != nullptr) {
4200 super_size = super->transitive_interfaces()->length();
4201 max_transitive_size += super_size;
4202 }
4203 // Add local interfaces' super interfaces
4204 const int local_size = local_ifs->length();
4205 for (int i = 0; i < local_size; i++) {
4206 InstanceKlass* const l = local_ifs->at(i);
4207 max_transitive_size += l->transitive_interfaces()->length();
4208 }
4209 // Finally add local interfaces
4210 max_transitive_size += local_size;
4211 // Construct array
4212 if (max_transitive_size == 0) {
4213 // no interfaces, use canonicalized array
4214 return Universe::the_empty_instance_klass_array();
4215 } else if (max_transitive_size == super_size) {
4216 // no new local interfaces added, share superklass' transitive interface array
4217 return super->transitive_interfaces();
4218 // The three lines below are commented to work around bug JDK-8245487
4219 // } else if (max_transitive_size == local_size) {
4220 // // only local interfaces added, share local interface array
4221 // return local_ifs;
4222 } else {
4223 ResourceMark rm;
4224 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4225
4226 // Copy down from superclass
4227 if (super != nullptr) {
4228 append_interfaces(result, super->transitive_interfaces());
4229 }
4230
4231 // Copy down from local interfaces' superinterfaces
4232 for (int i = 0; i < local_size; i++) {
4233 InstanceKlass* const l = local_ifs->at(i);
4234 append_interfaces(result, l->transitive_interfaces());
4235 }
4236 // Finally add local interfaces
4237 append_interfaces(result, local_ifs);
4238
4239 // length will be less than the max_transitive_size if duplicates were removed
4240 const int length = result->length();
4241 assert(length <= max_transitive_size, "just checking");
4242
4243 Array<InstanceKlass*>* const new_result =
4244 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4245 for (int i = 0; i < length; i++) {
4246 InstanceKlass* const e = result->at(i);
4247 assert(e != nullptr, "just checking");
4248 new_result->at_put(i, e);
4249 }
4250 return new_result;
4251 }
4252 }
4253
4254 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4255 assert(this_klass != nullptr, "invariant");
4256 const InstanceKlass* const super = this_klass->super();
4257
4258 if (super != nullptr) {
4259 if (super->is_final()) {
4260 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4261 return;
4262 }
4263
4264 if (super->is_sealed()) {
4265 stringStream ss;
4266 ResourceMark rm(THREAD);
4267 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4268 classfile_icce_error(ss.as_string(), THREAD);
4269 return;
4270 }
4271 }
4272
4273 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4274 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4275 // for a value classes. So, it is treated as a special case for now.
4276 if (!this_klass->access_flags().is_identity_class() &&
4277 super->name() != vmSymbols::java_lang_Object() &&
4278 super->is_identity_class()) {
4279 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4280 return;
4281 }
4282
4283 Reflection::VerifyClassAccessResults vca_result =
4284 Reflection::verify_class_access(this_klass, super, false);
4285 if (vca_result != Reflection::ACCESS_OK) {
4286 ResourceMark rm(THREAD);
4287 char* msg = Reflection::verify_class_access_msg(this_klass,
4288 super,
4289 vca_result);
4290
4291 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4292 if (msg == nullptr) {
4293 bool same_module = (this_klass->module() == super->module());
4294 Exceptions::fthrow(
4295 THREAD_AND_LOCATION,
4296 vmSymbols::java_lang_IllegalAccessError(),
4297 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4298 this_klass->external_name(),
4299 super->is_abstract() ? "abstract " : "",
4300 super->external_name(),
4301 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4302 (same_module) ? "" : "; ",
4455 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4456 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4457 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4458 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4459 if (is_module) {
4460 ResourceMark rm(THREAD);
4461 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4462 Exceptions::fthrow(
4463 THREAD_AND_LOCATION,
4464 vmSymbols::java_lang_NoClassDefFoundError(),
4465 "%s is not a class because access_flag ACC_MODULE is set",
4466 _class_name->as_C_string());
4467 return;
4468 }
4469
4470 if (!_need_verify) { return; }
4471
4472 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4473 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4474 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4475 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4476 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4477 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4478 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4479 const bool valid_value_class = is_identity || is_interface ||
4480 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4481
4482 if ((is_abstract && is_final) ||
4483 (is_interface && !is_abstract) ||
4484 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4485 (!is_interface && major_gte_1_5 && is_annotation) ||
4486 (!valid_value_class)) {
4487 ResourceMark rm(THREAD);
4488 const char* class_note = "";
4489 if (!valid_value_class) {
4490 class_note = " (a value class must be final or else abstract)";
4491 }
4492 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4493 if (inner_name == nullptr && !is_anonymous_inner_class) {
4494 Exceptions::fthrow(
4495 THREAD_AND_LOCATION,
4496 vmSymbols::java_lang_ClassFormatError(),
4497 "Illegal class modifiers in class %s: 0x%X",
4498 _class_name->as_C_string(), flags
4499 );
4500 } else {
4501 if (is_anonymous_inner_class) {
4502 Exceptions::fthrow(
4503 THREAD_AND_LOCATION,
4504 vmSymbols::java_lang_ClassFormatError(),
4505 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4506 _class_name->as_C_string(), flags
4507 );
4508 } else {
4509 Exceptions::fthrow(
4510 THREAD_AND_LOCATION,
4511 vmSymbols::java_lang_ClassFormatError(),
4565 THREAD_AND_LOCATION,
4566 vmSymbols::java_lang_UnsupportedClassVersionError(),
4567 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4568 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4569 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4570 return;
4571 }
4572
4573 if (!Arguments::enable_preview()) {
4574 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4575 class_name, major, minor, THREAD);
4576 return;
4577 }
4578
4579 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4580 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4581 class_name, major, minor, THREAD);
4582 }
4583 }
4584
4585 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4586 AccessFlags class_access_flags,
4587 TRAPS) const {
4588 if (!_need_verify) { return; }
4589
4590 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4591 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4592 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4593 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4594 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4595 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4596 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4597 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4598 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4599 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4600
4601 const bool is_interface = class_access_flags.is_interface();
4602 const bool is_identity_class = class_access_flags.is_identity_class();
4603
4604 bool is_illegal = false;
4605 const char* error_msg = "";
4606
4607 // There is some overlap in the checks that apply, for example interface fields
4608 // must be static, static fields can't be strict, and therefore interfaces can't
4609 // have strict fields. So we don't have to check every possible invalid combination
4610 // individually as long as all are covered. Once we have found an illegal combination
4611 // we can stop checking.
4612
4613 if (!is_illegal) {
4614 if (is_interface) {
4615 if (!is_public || !is_static || !is_final || is_private ||
4616 is_protected || is_volatile || is_transient ||
4617 (major_gte_1_5 && is_enum)) {
4618 is_illegal = true;
4619 error_msg = "interface fields must be public, static and final, and may be synthetic";
4620 }
4621 } else { // not interface
4622 if (has_illegal_visibility(flags)) {
4623 is_illegal = true;
4624 error_msg = "invalid visibility flags for class field";
4625 } else if (is_final && is_volatile) {
4626 is_illegal = true;
4627 error_msg = "fields cannot be final and volatile";
4628 } else if (supports_inline_types()) {
4629 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4630 is_illegal = true;
4631 error_msg = "value class fields must be either non-static final and strict, or static";
4632 }
4633 }
4634 }
4635 }
4636
4637 if (is_illegal) {
4638 ResourceMark rm(THREAD);
4639 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4640 Exceptions::fthrow(
4641 THREAD_AND_LOCATION,
4642 vmSymbols::java_lang_ClassFormatError(),
4643 "Illegal field modifiers (%s) in class %s: 0x%X",
4644 error_msg, _class_name->as_C_string(), flags);
4645 return;
4646 }
4647 }
4648
4649 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4650 AccessFlags class_access_flags,
4651 const Symbol* name,
4652 TRAPS) const {
4653 if (!_need_verify) { return; }
4654
4655 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4656 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4657 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4658 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4659 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4660 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4661 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4662 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4663 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4664 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4665 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4666 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4667 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4668 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4669 // LW401 CR required: removal of value factories support
4670 const bool is_interface = class_access_flags.is_interface();
4671 const bool is_identity_class = class_access_flags.is_identity_class();
4672 const bool is_abstract_class = class_access_flags.is_abstract();
4673
4674 bool is_illegal = false;
4675
4676 const char* class_note = "";
4677 if (is_interface) {
4678 if (major_gte_8) {
4679 // Class file version is JAVA_8_VERSION or later Methods of
4680 // interfaces may set any of the flags except ACC_PROTECTED,
4681 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4682 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4683 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4684 (is_native || is_protected || is_final || is_synchronized) ||
4685 // If a specific method of a class or interface has its
4686 // ACC_ABSTRACT flag set, it must not have any of its
4687 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4688 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4689 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4690 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4691 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4692 is_illegal = true;
4693 }
4694 } else if (major_gte_1_5) {
4695 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4696 if (!is_public || is_private || is_protected || is_static || is_final ||
4697 is_synchronized || is_native || !is_abstract || is_strict) {
4698 is_illegal = true;
4699 }
4700 } else {
4701 // Class file version is pre-JAVA_1_5_VERSION
4702 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4703 is_illegal = true;
4704 }
4705 }
4706 } else { // not interface
4707 if (has_illegal_visibility(flags)) {
4708 is_illegal = true;
4709 } else {
4710 if (is_initializer) {
4711 if (is_static || is_final || is_synchronized || is_native ||
4712 is_abstract || (major_gte_1_5 && is_bridge)) {
4713 is_illegal = true;
4714 }
4715 } else { // not initializer
4716 if (!is_identity_class && is_synchronized && !is_static) {
4717 is_illegal = true;
4718 class_note = " (not an identity class)";
4719 } else {
4720 if (is_abstract) {
4721 if ((is_final || is_native || is_private || is_static ||
4722 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4723 is_illegal = true;
4724 }
4725 }
4726 }
4727 }
4728 }
4729 }
4730
4731 if (is_illegal) {
4732 ResourceMark rm(THREAD);
4733 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4734 Exceptions::fthrow(
4735 THREAD_AND_LOCATION,
4736 vmSymbols::java_lang_ClassFormatError(),
4737 "Method %s in class %s%s has illegal modifiers: 0x%X",
4738 name->as_C_string(), _class_name->as_C_string(),
4739 class_note, flags);
4740 return;
4741 }
4742 }
4743
4744 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4745 int length,
4746 TRAPS) const {
4747 assert(_need_verify, "only called when _need_verify is true");
4748 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4749 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4750 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4751 }
4752 }
4753
4754 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4755 // In class names, '/' separates unqualified names. This is verified in this function also.
4756 // Method names also may not contain the characters '<' or '>', unless <init>
4757 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4758 // method. Because these names have been checked as special cases before
4759 // calling this method in verify_legal_method_name.
4777 if (type == ClassFileParser::LegalClass) {
4778 if (p == name || p+1 >= name+length ||
4779 *(p+1) == JVM_SIGNATURE_SLASH) {
4780 return false;
4781 }
4782 } else {
4783 return false; // do not permit '/' unless it's class name
4784 }
4785 break;
4786 case JVM_SIGNATURE_SPECIAL:
4787 case JVM_SIGNATURE_ENDSPECIAL:
4788 // do not permit '<' or '>' in method names
4789 if (type == ClassFileParser::LegalMethod) {
4790 return false;
4791 }
4792 }
4793 }
4794 return true;
4795 }
4796
4797 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4798 if (_loadable_descriptors == nullptr) return false;
4799 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4800 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4801 if (class_name == klass) return true;
4802 }
4803 return false;
4804 }
4805
4806 // Take pointer to a UTF8 byte string (not NUL-terminated).
4807 // Skip over the longest part of the string that could
4808 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4809 // Return a pointer to just past the fieldname.
4810 // Return null if no fieldname at all was found, or in the case of slash_ok
4811 // being true, we saw consecutive slashes (meaning we were looking for a
4812 // qualified path but found something that was badly-formed).
4813 static const char* skip_over_field_name(const char* const name,
4814 bool slash_ok,
4815 unsigned int length) {
4816 const char* p;
4817 jboolean last_is_slash = false;
4818 jboolean not_first_ch = false;
4819
4820 for (p = name; p != name + length; not_first_ch = true) {
4821 const char* old_p = p;
4822 jchar ch = *p;
4823 if (ch < 128) {
4824 p++;
4825 // quick check for ascii
4887 // be taken as a field signature. Allow "void" if void_ok.
4888 // Return a pointer to just past the signature.
4889 // Return null if no legal signature is found.
4890 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4891 bool void_ok,
4892 unsigned int length,
4893 TRAPS) const {
4894 unsigned int array_dim = 0;
4895 while (length > 0) {
4896 switch (signature[0]) {
4897 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4898 case JVM_SIGNATURE_BOOLEAN:
4899 case JVM_SIGNATURE_BYTE:
4900 case JVM_SIGNATURE_CHAR:
4901 case JVM_SIGNATURE_SHORT:
4902 case JVM_SIGNATURE_INT:
4903 case JVM_SIGNATURE_FLOAT:
4904 case JVM_SIGNATURE_LONG:
4905 case JVM_SIGNATURE_DOUBLE:
4906 return signature + 1;
4907 case JVM_SIGNATURE_CLASS:
4908 {
4909 if (_major_version < JAVA_1_5_VERSION) {
4910 signature++;
4911 length--;
4912 // Skip over the class name if one is there
4913 const char* const p = skip_over_field_name(signature, true, length);
4914 assert(p == nullptr || p > signature, "must parse one character at least");
4915 // The next character better be a semicolon
4916 if (p != nullptr && // Parse of field name succeeded.
4917 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4918 p[0] == JVM_SIGNATURE_ENDCLASS) {
4919 return p + 1;
4920 }
4921 }
4922 else {
4923 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4924 signature++;
4925 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4926 // Format check signature
4927 if (c != nullptr) {
4928 int newlen = pointer_delta_as_int(c, (char*) signature);
4929 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4930 if (!legal) {
4931 classfile_parse_error("Class name is empty or contains illegal character "
4932 "in descriptor in class file %s",
4933 THREAD);
4934 return nullptr;
4935 }
4936 return signature + newlen + 1;
4937 }
4938 }
4939 return nullptr;
4940 }
4941 case JVM_SIGNATURE_ARRAY:
4942 array_dim++;
4943 if (array_dim > 255) {
4959
4960 // Checks if name is a legal class name.
4961 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4962 if (!_need_verify) { return; }
4963
4964 assert(name->refcount() > 0, "symbol must be kept alive");
4965 char* bytes = (char*)name->bytes();
4966 unsigned int length = name->utf8_length();
4967 bool legal = false;
4968
4969 if (length > 0) {
4970 const char* p;
4971 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4972 p = skip_over_field_signature(bytes, false, length, CHECK);
4973 legal = (p != nullptr) && ((p - bytes) == (int)length);
4974 } else if (_major_version < JAVA_1_5_VERSION) {
4975 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4976 p = skip_over_field_name(bytes, true, length);
4977 legal = (p != nullptr) && ((p - bytes) == (int)length);
4978 }
4979 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4980 && bytes[length - 1] == ';' ) {
4981 // Support for L...; descriptors
4982 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4983 } else {
4984 // 4900761: relax the constraints based on JSR202 spec
4985 // Class names may be drawn from the entire Unicode character set.
4986 // Identifiers between '/' must be unqualified names.
4987 // The utf8 string has been verified when parsing cpool entries.
4988 legal = verify_unqualified_name(bytes, length, LegalClass);
4989 }
4990 }
4991 if (!legal) {
4992 ResourceMark rm(THREAD);
4993 assert(_class_name != nullptr, "invariant");
4994 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4995 Exceptions::fthrow(
4996 THREAD_AND_LOCATION,
4997 vmSymbols::java_lang_ClassFormatError(),
4998 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4999 _class_name->as_C_string()
5000 );
5001 return;
5002 }
5030 THREAD_AND_LOCATION,
5031 vmSymbols::java_lang_ClassFormatError(),
5032 "Illegal field name \"%.*s\" in class %s", length, bytes,
5033 _class_name->as_C_string()
5034 );
5035 return;
5036 }
5037 }
5038
5039 // Checks if name is a legal method name.
5040 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5041 if (!_need_verify) { return; }
5042
5043 assert(name != nullptr, "method name is null");
5044 char* bytes = (char*)name->bytes();
5045 unsigned int length = name->utf8_length();
5046 bool legal = false;
5047
5048 if (length > 0) {
5049 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5050 if (name == vmSymbols::object_initializer_name() ||
5051 name == vmSymbols::class_initializer_name()) {
5052 legal = true;
5053 }
5054 } else if (_major_version < JAVA_1_5_VERSION) {
5055 const char* p;
5056 p = skip_over_field_name(bytes, false, length);
5057 legal = (p != nullptr) && ((p - bytes) == (int)length);
5058 } else {
5059 // 4881221: relax the constraints based on JSR202 spec
5060 legal = verify_unqualified_name(bytes, length, LegalMethod);
5061 }
5062 }
5063
5064 if (!legal) {
5065 ResourceMark rm(THREAD);
5066 assert(_class_name != nullptr, "invariant");
5067 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5068 Exceptions::fthrow(
5069 THREAD_AND_LOCATION,
5070 vmSymbols::java_lang_ClassFormatError(),
5071 "Illegal method name \"%.*s\" in class %s", length, bytes,
5072 _class_name->as_C_string()
5073 );
5074 return;
5075 }
5076 }
5077
5078 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5079 const char* const bytes = (const char*)signature->bytes();
5080 const unsigned int length = signature->utf8_length();
5081 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5082
5083 if (p == nullptr || (p - bytes) != (int)length) {
5084 return false;
5085 }
5086 return true;
5087 }
5088
5089 // Checks if signature is a legal field signature.
5090 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5091 const Symbol* signature,
5092 TRAPS) const {
5093 if (!_need_verify) { return; }
5094
5095 const char* const bytes = (const char*)signature->bytes();
5096 const unsigned int length = signature->utf8_length();
5097 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5098
5099 if (p == nullptr || (p - bytes) != (int)length) {
5100 throwIllegalSignature("Field", name, signature, CHECK);
5101 }
5102 }
5103
5104 // Check that the signature is compatible with the method name. For example,
5105 // check that <init> has a void signature.
5106 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5107 const Symbol* signature,
5108 TRAPS) const {
5109 if (!_need_verify) {
5110 return;
5111 }
5112
5113 // Class initializers cannot have args for class format version >= 51.
5114 if (name == vmSymbols::class_initializer_name() &&
5115 signature != vmSymbols::void_method_signature() &&
5116 _major_version >= JAVA_7_VERSION) {
5117 throwIllegalSignature("Method", name, signature, THREAD);
5118 return;
5119 }
5120
5121 int sig_length = signature->utf8_length();
5122 if (name->utf8_length() > 0 &&
5123 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5124 sig_length > 0 &&
5125 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5126 throwIllegalSignature("Method", name, signature, THREAD);
5127 }
5128 }
5129
5130 // Checks if signature is a legal method signature.
5131 // Returns number of parameters
5132 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5133 const Symbol* signature,
5134 TRAPS) const {
5135 if (!_need_verify) {
5136 // make sure caller's args_size will be less than 0 even for non-static
5137 // method so it will be recomputed in compute_size_of_parameters().
5138 return -2;
5139 }
5140
5141 unsigned int args_size = 0;
5142 const char* p = (const char*)signature->bytes();
5143 unsigned int length = signature->utf8_length();
5144 const char* nextp;
5145
5156 length -= pointer_delta_as_int(nextp, p);
5157 p = nextp;
5158 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5159 }
5160 // The first non-signature thing better be a ')'
5161 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5162 length--;
5163 // Now we better just have a return value
5164 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5165 if (nextp && ((int)length == (nextp - p))) {
5166 return args_size;
5167 }
5168 }
5169 }
5170 // Report error
5171 throwIllegalSignature("Method", name, signature, THREAD);
5172 return 0;
5173 }
5174
5175 int ClassFileParser::static_field_size() const {
5176 assert(_layout_info != nullptr, "invariant");
5177 return _layout_info->_static_field_size;
5178 }
5179
5180 int ClassFileParser::total_oop_map_count() const {
5181 assert(_layout_info != nullptr, "invariant");
5182 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5183 }
5184
5185 jint ClassFileParser::layout_size() const {
5186 assert(_layout_info != nullptr, "invariant");
5187 return _layout_info->_instance_size;
5188 }
5189
5190 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5191 const Array<Method*>* methods) {
5192 assert(ik != nullptr, "invariant");
5193 assert(methods != nullptr, "invariant");
5194
5195 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5196 // (We used to do this lazily, but now we query it in Rewriter,
5197 // which is eagerly done for every method, so we might as well do it now,
5198 // when everything is fresh in memory.)
5199 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5200
5201 if (klass_id != vmSymbolID::NO_SID) {
5202 for (int j = 0; j < methods->length(); ++j) {
5203 Method* method = methods->at(j);
5204 method->init_intrinsic_id(klass_id);
5205
5206 if (CheckIntrinsics) {
5207 // Check if an intrinsic is defined for method 'method',
5282 }
5283 }
5284
5285 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5286 const ClassInstanceInfo& cl_inst_info,
5287 TRAPS) {
5288 if (_klass != nullptr) {
5289 return _klass;
5290 }
5291
5292 InstanceKlass* const ik =
5293 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5294
5295 if (is_hidden()) {
5296 mangle_hidden_class_name(ik);
5297 }
5298
5299 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5300
5301 assert(_klass == ik, "invariant");
5302 return ik;
5303 }
5304
5305 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5306 bool changed_by_loadhook,
5307 const ClassInstanceInfo& cl_inst_info,
5308 TRAPS) {
5309 assert(ik != nullptr, "invariant");
5310
5311 // Set name and CLD before adding to CLD
5312 ik->set_class_loader_data(_loader_data);
5313 ik->set_class_loader_type();
5314 ik->set_name(_class_name);
5315
5316 // Add all classes to our internal class loader list here,
5317 // including classes in the bootstrap (null) class loader.
5318 const bool publicize = !is_internal();
5319
5320 _loader_data->add_class(ik, publicize);
5321
5322 set_klass_to_deallocate(ik);
5323
5324 assert(_layout_info != nullptr, "invariant");
5325 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5326 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5327 "sanity");
5328
5329 assert(ik->is_instance_klass(), "sanity");
5330 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5331
5332 // Fill in information already parsed
5333 ik->set_should_verify_class(_need_verify);
5334
5335 // Not yet: supers are done below to support the new subtype-checking fields
5336 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5337 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5338 ik->set_has_strict_static_fields(_has_strict_static_fields);
5339
5340 if (_layout_info->_is_naturally_atomic) {
5341 ik->set_is_naturally_atomic();
5342 }
5343
5344 if (_layout_info->_must_be_atomic) {
5345 ik->set_must_be_atomic();
5346 }
5347
5348 ik->set_static_oop_field_count(_static_oop_count);
5349
5350 // this transfers ownership of a lot of arrays from
5351 // the parser onto the InstanceKlass*
5352 apply_parsed_class_metadata(ik, _java_fields_count);
5353 if (ik->is_inline_klass()) {
5354 InlineKlass::cast(ik)->init_fixed_block();
5355 }
5356
5357 // can only set dynamic nest-host after static nest information is set
5358 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5359 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5360 }
5361
5362 // note that is not safe to use the fields in the parser from this point on
5363 assert(nullptr == _cp, "invariant");
5364 assert(nullptr == _fieldinfo_stream, "invariant");
5365 assert(nullptr == _fieldinfo_search_table, "invariant");
5366 assert(nullptr == _fields_status, "invariant");
5367 assert(nullptr == _methods, "invariant");
5368 assert(nullptr == _inner_classes, "invariant");
5369 assert(nullptr == _nest_members, "invariant");
5370 assert(nullptr == _loadable_descriptors, "invariant");
5371 assert(nullptr == _combined_annotations, "invariant");
5372 assert(nullptr == _record_components, "invariant");
5373 assert(nullptr == _permitted_subclasses, "invariant");
5374 assert(nullptr == _inline_layout_info_array, "invariant");
5375
5376 if (_has_localvariable_table) {
5377 ik->set_has_localvariable_table(true);
5378 }
5379
5380 if (_has_final_method) {
5381 ik->set_has_final_method();
5382 }
5383
5384 ik->copy_method_ordering(_method_ordering, CHECK);
5385 // The InstanceKlass::_methods_jmethod_ids cache
5386 // is managed on the assumption that the initial cache
5387 // size is equal to the number of methods in the class. If
5388 // that changes, then InstanceKlass::idnum_can_increment()
5389 // has to be changed accordingly.
5390 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5391
5392 ik->set_this_class_index(_this_class_index);
5393
5394 if (_is_hidden) {
5431 if ((_num_miranda_methods > 0) ||
5432 // if this class introduced new miranda methods or
5433 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5434 // super class exists and this class inherited miranda methods
5435 ) {
5436 ik->set_has_miranda_methods(); // then set a flag
5437 }
5438
5439 // Fill in information needed to compute superclasses.
5440 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5441 ik->set_transitive_interfaces(_transitive_interfaces);
5442 ik->set_local_interfaces(_local_interfaces);
5443 _transitive_interfaces = nullptr;
5444 _local_interfaces = nullptr;
5445
5446 // Initialize itable offset tables
5447 klassItable::setup_itable_offset_table(ik);
5448
5449 // Compute transitive closure of interfaces this class implements
5450 // Do final class setup
5451 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5452 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5453 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5454 }
5455
5456 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5457 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5458 ik->set_has_contended_annotations(true);
5459 }
5460
5461 // Fill in has_finalizer and layout_helper
5462 set_precomputed_flags(ik);
5463
5464 // check if this class can access its super class
5465 check_super_class_access(ik, CHECK);
5466
5467 // check if this class can access its superinterfaces
5468 check_super_interface_access(ik, CHECK);
5469
5470 // check if this class overrides any final method
5471 check_final_method_override(ik, CHECK);
5492
5493 assert(_all_mirandas != nullptr, "invariant");
5494
5495 // Generate any default methods - default methods are public interface methods
5496 // that have a default implementation. This is new with Java 8.
5497 if (_has_nonstatic_concrete_methods) {
5498 DefaultMethods::generate_default_methods(ik,
5499 _all_mirandas,
5500 CHECK);
5501 }
5502
5503 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5504 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5505 !module_entry->has_default_read_edges()) {
5506 if (!module_entry->set_has_default_read_edges()) {
5507 // We won a potential race
5508 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5509 }
5510 }
5511
5512 if (is_inline_type()) {
5513 InlineKlass* vk = InlineKlass::cast(ik);
5514 vk->set_payload_alignment(_layout_info->_payload_alignment);
5515 vk->set_payload_offset(_layout_info->_payload_offset);
5516 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5517 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5518 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5519 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5520 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5521 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5522 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5523 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5524 vk->initialize_calling_convention(CHECK);
5525 }
5526
5527 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5528
5529 if (!is_internal()) {
5530 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5531
5532 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5533 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5534 log_is_enabled(Info, class, preview)) {
5535 ResourceMark rm;
5536 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5537 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5538 }
5539
5540 if (log_is_enabled(Debug, class, resolve)) {
5541 ResourceMark rm;
5542 // print out the superclass.
5543 const char * from = ik->external_name();
5544 if (ik->super() != nullptr) {
5545 log_debug(class, resolve)("%s %s (super)",
5546 from,
5589 const ClassLoadInfo* cl_info,
5590 Publicity pub_level,
5591 TRAPS) :
5592 _stream(stream),
5593 _class_name(nullptr),
5594 _loader_data(loader_data),
5595 _is_hidden(cl_info->is_hidden()),
5596 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5597 _orig_cp_size(0),
5598 _static_oop_count(0),
5599 _super_klass(),
5600 _cp(nullptr),
5601 _fieldinfo_stream(nullptr),
5602 _fieldinfo_search_table(nullptr),
5603 _fields_status(nullptr),
5604 _methods(nullptr),
5605 _inner_classes(nullptr),
5606 _nest_members(nullptr),
5607 _nest_host(0),
5608 _permitted_subclasses(nullptr),
5609 _loadable_descriptors(nullptr),
5610 _record_components(nullptr),
5611 _local_interfaces(nullptr),
5612 _local_interface_indexes(nullptr),
5613 _transitive_interfaces(nullptr),
5614 _combined_annotations(nullptr),
5615 _class_annotations(nullptr),
5616 _class_type_annotations(nullptr),
5617 _fields_annotations(nullptr),
5618 _fields_type_annotations(nullptr),
5619 _klass(nullptr),
5620 _klass_to_deallocate(nullptr),
5621 _parsed_annotations(nullptr),
5622 _layout_info(nullptr),
5623 _inline_layout_info_array(nullptr),
5624 _temp_field_info(nullptr),
5625 _method_ordering(nullptr),
5626 _all_mirandas(nullptr),
5627 _vtable_size(0),
5628 _itable_size(0),
5629 _num_miranda_methods(0),
5630 _protection_domain(cl_info->protection_domain()),
5631 _access_flags(),
5632 _pub_level(pub_level),
5633 _bad_constant_seen(0),
5634 _synthetic_flag(false),
5635 _sde_length(false),
5636 _sde_buffer(nullptr),
5637 _sourcefile_index(0),
5638 _generic_signature_index(0),
5639 _major_version(0),
5640 _minor_version(0),
5641 _this_class_index(0),
5642 _super_class_index(0),
5643 _itfs_len(0),
5644 _java_fields_count(0),
5645 _need_verify(false),
5646 _has_nonstatic_concrete_methods(false),
5647 _declares_nonstatic_concrete_methods(false),
5648 _has_localvariable_table(false),
5649 _has_final_method(false),
5650 _has_contended_fields(false),
5651 _has_aot_runtime_setup_method(false),
5652 _has_strict_static_fields(false),
5653 _has_inline_type_fields(false),
5654 _is_naturally_atomic(false),
5655 _must_be_atomic(true),
5656 _has_loosely_consistent_annotation(false),
5657 _has_finalizer(false),
5658 _has_empty_finalizer(false),
5659 _max_bootstrap_specifier_index(-1) {
5660
5661 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5662 _class_name->increment_refcount();
5663
5664 assert(_loader_data != nullptr, "invariant");
5665 assert(stream != nullptr, "invariant");
5666 assert(_stream != nullptr, "invariant");
5667 assert(_stream->buffer() == _stream->current(), "invariant");
5668 assert(_class_name != nullptr, "invariant");
5669 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5670
5671 // Figure out whether we can skip format checking (matching classic VM behavior)
5672 // Always verify CFLH bytes from the user agents.
5673 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5674
5675 // synch back verification state to stream to check for truncation.
5676 stream->set_need_verify(_need_verify);
5677
5678 parse_stream(stream, CHECK);
5679
5680 post_process_parsed_stream(stream, _cp, CHECK);
5681 }
5682
5683 void ClassFileParser::clear_class_metadata() {
5684 // metadata created before the instance klass is created. Must be
5685 // deallocated if classfile parsing returns an error.
5686 _cp = nullptr;
5687 _fieldinfo_stream = nullptr;
5688 _fieldinfo_search_table = nullptr;
5689 _fields_status = nullptr;
5690 _methods = nullptr;
5691 _inner_classes = nullptr;
5692 _nest_members = nullptr;
5693 _permitted_subclasses = nullptr;
5694 _loadable_descriptors = nullptr;
5695 _combined_annotations = nullptr;
5696 _class_annotations = _class_type_annotations = nullptr;
5697 _fields_annotations = _fields_type_annotations = nullptr;
5698 _record_components = nullptr;
5699 _inline_layout_info_array = nullptr;
5700 }
5701
5702 // Destructor to clean up
5703 ClassFileParser::~ClassFileParser() {
5704 _class_name->decrement_refcount();
5705
5706 if (_cp != nullptr) {
5707 MetadataFactory::free_metadata(_loader_data, _cp);
5708 }
5709
5710 if (_fieldinfo_stream != nullptr) {
5711 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5712 }
5713 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5714
5715 if (_fields_status != nullptr) {
5716 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5717 }
5718
5719 if (_inline_layout_info_array != nullptr) {
5720 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5721 }
5722
5723 if (_methods != nullptr) {
5724 // Free methods
5725 InstanceKlass::deallocate_methods(_loader_data, _methods);
5726 }
5727
5728 // beware of the Universe::empty_blah_array!!
5729 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5730 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5731 }
5732
5733 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5734 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5735 }
5736
5737 if (_record_components != nullptr) {
5738 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5739 }
5740
5741 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5742 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5743 }
5744
5745 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5746 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5747 }
5748
5749 // Free interfaces
5750 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5751 _local_interfaces, _transitive_interfaces);
5752
5753 if (_combined_annotations != nullptr) {
5754 // After all annotations arrays have been created, they are installed into the
5755 // Annotations object that will be assigned to the InstanceKlass being created.
5756
5757 // Deallocate the Annotations object and the installed annotations arrays.
5758 _combined_annotations->deallocate_contents(_loader_data);
5759
5760 // If the _combined_annotations pointer is non-null,
5761 // then the other annotations fields should have been cleared.
5762 assert(_class_annotations == nullptr, "Should have been cleared");
5763 assert(_class_type_annotations == nullptr, "Should have been cleared");
5764 assert(_fields_annotations == nullptr, "Should have been cleared");
5765 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5766 } else {
5767 // If the annotations arrays were not installed into the Annotations object,
5768 // then they have to be deallocated explicitly.
5827
5828 assert(cp_size == (u2)cp->length(), "invariant");
5829
5830 // ACCESS FLAGS
5831 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5832
5833 // Access flags
5834 u2 flags;
5835 // JVM_ACC_MODULE is defined in JDK-9 and later.
5836 if (_major_version >= JAVA_9_VERSION) {
5837 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5838 } else {
5839 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5840 }
5841
5842 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5843 // Set abstract bit for old class files for backward compatibility
5844 flags |= JVM_ACC_ABSTRACT;
5845 }
5846
5847 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5848 if (!supports_inline_types()) {
5849 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5850 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5851 if (!is_module && !is_interface) {
5852 flags |= JVM_ACC_IDENTITY;
5853 }
5854 }
5855
5856 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5857
5858 short bad_constant = class_bad_constant_seen();
5859 if (bad_constant != 0) {
5860 // Do not throw CFE until after the access_flags are checked because if
5861 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5862 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5863 return;
5864 }
5865
5866 _access_flags.set_flags(flags);
5867
5868 // This class and superclass
5869 _this_class_index = stream->get_u2_fast();
5870 guarantee_property(
5871 valid_cp_range(_this_class_index, cp_size) &&
5872 cp->tag_at(_this_class_index).is_unresolved_klass(),
5873 "Invalid this class index %u in constant pool in class file %s",
5874 _this_class_index, CHECK);
5875
5939 }
5940 ls.cr();
5941 }
5942 }
5943
5944 // SUPERKLASS
5945 _super_class_index = stream->get_u2_fast();
5946 check_super_class(cp,
5947 _super_class_index,
5948 _need_verify,
5949 CHECK);
5950
5951 // Interfaces
5952 _itfs_len = stream->get_u2_fast();
5953 parse_interfaces(stream,
5954 _itfs_len,
5955 cp,
5956 &_has_nonstatic_concrete_methods,
5957 CHECK);
5958
5959 // Fields (offsets are filled in later)
5960 parse_fields(stream,
5961 _access_flags,
5962 cp,
5963 cp_size,
5964 &_java_fields_count,
5965 CHECK);
5966
5967 assert(_temp_field_info != nullptr, "invariant");
5968
5969 // Methods
5970 parse_methods(stream,
5971 is_interface(),
5972 !is_identity_class(),
5973 is_abstract_class(),
5974 &_has_localvariable_table,
5975 &_has_final_method,
5976 &_declares_nonstatic_concrete_methods,
5977 CHECK);
5978
5979 assert(_methods != nullptr, "invariant");
5980
5981 if (_declares_nonstatic_concrete_methods) {
5982 _has_nonstatic_concrete_methods = true;
5983 }
5984
5985 // Additional attributes/annotations
5986 _parsed_annotations = new ClassAnnotationCollector();
5987 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5988
5989 assert(_inner_classes != nullptr, "invariant");
5990
5991 // Finalize the Annotations metadata object,
5992 // now that all annotation arrays have been created.
5993 create_combined_annotations(CHECK);
6041 }
6042
6043 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6044 ConstantPool* cp,
6045 TRAPS) {
6046 assert(stream != nullptr, "invariant");
6047 assert(stream->at_eos(), "invariant");
6048 assert(cp != nullptr, "invariant");
6049 assert(_loader_data != nullptr, "invariant");
6050
6051 if (_class_name == vmSymbols::java_lang_Object()) {
6052 precond(_super_class_index == 0);
6053 precond(_super_klass == nullptr);
6054 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6055 "java.lang.Object cannot implement an interface in class file %s",
6056 CHECK);
6057 } else {
6058 // Set _super_klass after class file is parsed and format is checked
6059 assert(_super_class_index > 0, "any class other than Object must have a super class");
6060 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6061 if (is_interface()) {
6062 // Before attempting to resolve the superclass, check for class format
6063 // errors not checked yet.
6064 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6065 "Interfaces must have java.lang.Object as superclass in class file %s",
6066 CHECK);
6067 }
6068 Handle loader(THREAD, _loader_data->class_loader());
6069 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6070 // fast path to avoid lookup
6071 _super_klass = vmClasses::Object_klass();
6072 } else {
6073 _super_klass = (const InstanceKlass*)
6074 SystemDictionary::resolve_super_or_fail(_class_name,
6075 super_class_name,
6076 loader,
6077 true,
6078 CHECK);
6079 }
6080 }
6081
6082 if (_super_klass != nullptr) {
6083 if (_super_klass->is_interface()) {
6084 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6085 return;
6086 }
6087
6088 if (_super_klass->is_final()) {
6089 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6090 return;
6091 }
6092
6093 if (EnableValhalla) {
6094 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6095 }
6096
6097 if (_super_klass->has_nonstatic_concrete_methods()) {
6098 _has_nonstatic_concrete_methods = true;
6099 }
6100 }
6101
6102 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6103 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6104 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6105 _class_name->as_klass_external_name()));
6106 }
6107
6108 // Determining is the class allows tearing or not (default is not)
6109 if (EnableValhalla && !_access_flags.is_identity_class()) {
6110 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6111 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6112 // Conditions above are not sufficient to determine atomicity requirements,
6113 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6114 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6115 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6116 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6117 _must_be_atomic = false;
6118 }
6119 // Apply VM options override
6120 if (*ForceNonTearable != '\0') {
6121 // Allow a command line switch to force the same atomicity property:
6122 const char* class_name_str = _class_name->as_C_string();
6123 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6124 _must_be_atomic = true;
6125 }
6126 }
6127 }
6128
6129 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6130 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6131 if (_local_interface_indexes != nullptr) {
6132 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6133 u2 interface_index = _local_interface_indexes->at(i);
6134 Klass* interf;
6135 if (cp->tag_at(interface_index).is_klass()) {
6136 interf = cp->resolved_klass_at(interface_index);
6137 } else {
6138 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6139
6140 // Don't need to check legal name because it's checked when parsing constant pool.
6141 // But need to make sure it's not an array type.
6142 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6143 "Bad interface name in class file %s", CHECK);
6144
6145 // Call resolve on the interface class name with class circularity checking
6146 interf = SystemDictionary::resolve_super_or_fail(
6147 _class_name,
6148 unresolved_klass,
6149 Handle(THREAD, _loader_data->class_loader()),
6150 false,
6151 CHECK);
6152 }
6153
6154 if (!interf->is_interface()) {
6155 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6156 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6157 _class_name->as_klass_external_name(),
6158 interf->external_name(),
6159 interf->class_in_module_of_loader()));
6160 }
6161
6162 if (EnableValhalla) {
6163 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6164 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6165 }
6166
6167 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6168 _has_nonstatic_concrete_methods = true;
6169 }
6170 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6171 }
6172 }
6173 assert(_local_interfaces != nullptr, "invariant");
6174
6175 // Compute the transitive list of all unique interfaces implemented by this class
6176 _transitive_interfaces =
6177 compute_transitive_interfaces(_super_klass,
6178 _local_interfaces,
6179 _loader_data,
6180 CHECK);
6181
6182 assert(_transitive_interfaces != nullptr, "invariant");
6183
6184 // sort methods
6185 _method_ordering = sort_methods(_methods);
6186
6187 _all_mirandas = new GrowableArray<Method*>(20);
6188
6189 Handle loader(THREAD, _loader_data->class_loader());
6190 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6191 &_num_miranda_methods,
6192 _all_mirandas,
6193 _super_klass,
6194 _methods,
6195 _access_flags,
6196 _major_version,
6197 loader,
6198 _class_name,
6199 _local_interfaces);
6200
6201 // Size of Java itable (in words)
6202 _itable_size = is_interface() ? 0 :
6203 klassItable::compute_itable_size(_transitive_interfaces);
6204
6205 assert(_parsed_annotations != nullptr, "invariant");
6206
6207 if (EnableValhalla) {
6208 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6209 java_fields_count(),
6210 CHECK);
6211 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6212 FieldInfo fieldinfo = *it;
6213 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6214 Symbol* sig = fieldinfo.signature(cp);
6215 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6216 // Pre-load classes of null-free fields that are candidate for flattening
6217 TempNewSymbol s = Signature::strip_envelope(sig);
6218 if (s == _class_name) {
6219 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6220 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6221 }
6222 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6223 "Cause: a null-free non-static field is declared with this type",
6224 s->as_C_string(), _class_name->as_C_string());
6225 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection(_class_name, s,
6226 Handle(THREAD,
6227 _loader_data->class_loader()),
6228 false, THREAD);
6229 if (HAS_PENDING_EXCEPTION) {
6230 log_warning(class, preload)("Preloading of class %s during loading of class %s "
6231 "(cause: null-free non-static field) failed: %s",
6232 s->as_C_string(), _class_name->as_C_string(),
6233 PENDING_EXCEPTION->klass()->name()->as_C_string());
6234 return; // Exception is still pending
6235 }
6236 assert(klass != nullptr, "Sanity check");
6237 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6238 InlineKlass* vk = InlineKlass::cast(klass);
6239 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6240 log_info(class, preload)("Preloading of class %s during loading of class %s "
6241 "(cause: null-free non-static field) succeeded",
6242 s->as_C_string(), _class_name->as_C_string());
6243 } else if (Signature::has_envelope(sig) && PreloadClasses) {
6244 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6245 // Those classes would be required later for the flattening of nullable inline type fields
6246 TempNewSymbol name = Signature::strip_envelope(sig);
6247 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6248 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6249 "Cause: field type in LoadableDescriptors attribute",
6250 name->as_C_string(), _class_name->as_C_string());
6251 oop loader = loader_data()->class_loader();
6252 Klass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6253 Handle(THREAD, loader),
6254 false, THREAD);
6255 if (klass != nullptr) {
6256 if (klass->is_inline_klass()) {
6257 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6258 log_info(class, preload)("Preloading of class %s during loading of class %s "
6259 "(cause: field type in LoadableDescriptors attribute) succeeded",
6260 name->as_C_string(), _class_name->as_C_string());
6261 } else {
6262 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6263 log_warning(class, preload)("Preloading of class %s during loading of class %s "
6264 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6265 name->as_C_string(), _class_name->as_C_string());
6266 }
6267 } else {
6268 log_warning(class, preload)("Preloading of class %s during loading of class %s "
6269 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6270 name->as_C_string(), _class_name->as_C_string(),
6271 PENDING_EXCEPTION->klass()->name()->as_C_string());
6272 }
6273 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6274 if (HAS_PENDING_EXCEPTION) {
6275 CLEAR_PENDING_EXCEPTION;
6276 }
6277 } else {
6278 // Just poking the system dictionary to see if the class has already be loaded. Looking for migrated classes
6279 // used when --enable-preview when jdk isn't compiled with --enable-preview so doesn't include LoadableDescriptors.
6280 // This is temporary.
6281 oop loader = loader_data()->class_loader();
6282 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6283 if (klass != nullptr && klass->is_inline_klass()) {
6284 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6285 log_info(class, preload)("Preloading of class %s during loading of class %s "
6286 "(cause: field type not in LoadableDescriptors attribute) succeeded",
6287 name->as_C_string(), _class_name->as_C_string());
6288 }
6289 }
6290 }
6291 }
6292 }
6293
6294 _layout_info = new FieldLayoutInfo();
6295 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6296 _parsed_annotations->is_contended(), is_inline_type(),
6297 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6298 _must_be_atomic, _layout_info, _inline_layout_info_array);
6299 lb.build_layout();
6300 _has_inline_type_fields = _layout_info->_has_inline_fields;
6301
6302 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6303 _fieldinfo_stream =
6304 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6305 injected_fields_count, loader_data(), CHECK);
6306 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6307 _fields_status =
6308 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6309 FieldStatus(0), CHECK);
6310
6311 // Strict static fields track initialization status from the beginning of time.
6312 // After this class runs <clinit>, they will be verified as being "not unset".
6313 // See Step 8 of InstanceKlass::initialize_impl.
6314 if (_has_strict_static_fields) {
6315 bool found_one = false;
6316 for (int i = 0; i < _temp_field_info->length(); i++) {
6317 FieldInfo& fi = *_temp_field_info->adr_at(i);
6318 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6319 found_one = true;
6320 if (fi.initializer_index() != 0) {
6321 // skip strict static fields with ConstantValue attributes
6322 } else {
6323 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6324 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6325 }
6326 }
6327 }
6328 assert(found_one == _has_strict_static_fields,
6329 "correct prediction = %d", (int)_has_strict_static_fields);
6330 }
6331 }
6332
6333 void ClassFileParser::set_klass(InstanceKlass* klass) {
6334
6335 #ifdef ASSERT
6336 if (klass != nullptr) {
6337 assert(nullptr == _klass, "leaking?");
6338 }
6339 #endif
6340
6341 _klass = klass;
6342 }
6343
6344 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6345
6346 #ifdef ASSERT
6347 if (klass != nullptr) {
6348 assert(nullptr == _klass_to_deallocate, "leaking?");
6349 }
6350 #endif
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