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/bsmAttribute.inline.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldInfo.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/instanceKlass.inline.hpp"
55 #include "oops/instanceMirrorKlass.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/klassVtable.hpp"
58 #include "oops/metadata.hpp"
59 #include "oops/method.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/recordComponent.hpp"
62 #include "oops/symbol.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "prims/jvmtiThreadState.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/fieldDescriptor.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/os.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/reflection.hpp"
72 #include "runtime/safepointVerifiers.hpp"
73 #include "runtime/signature.hpp"
74 #include "runtime/timer.hpp"
75 #include "services/classLoadingService.hpp"
76 #include "services/threadService.hpp"
77 #include "utilities/align.hpp"
78 #include "utilities/bitMap.inline.hpp"
79 #include "utilities/checkedCast.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/exceptions.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/globalDefinitions.hpp"
84 #include "utilities/growableArray.hpp"
85 #include "utilities/hashTable.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/ostream.hpp"
88 #include "utilities/utf8.hpp"
89 #if INCLUDE_CDS
90 #include "classfile/systemDictionaryShared.hpp"
91 #endif
92
93 // We generally try to create the oops directly when parsing, rather than
94 // allocating temporary data structures and copying the bytes twice. A
95 // temporary area is only needed when parsing utf8 entries in the constant
96 // pool and when parsing line number tables.
97
98 // We add assert in debug mode when class format is not checked.
99
100 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
101 #define JAVA_MIN_SUPPORTED_VERSION 45
102 #define JAVA_PREVIEW_MINOR_VERSION 65535
103
104 // Used for two backward compatibility reasons:
105 // - to check for new additions to the class file format in JDK1.5
106 // - to check for bug fixes in the format checker in JDK1.5
107 #define JAVA_1_5_VERSION 49
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 _jdk_internal_vm_annotation_TrustFinalFields,
947 _annotation_LIMIT
948 };
949 const Location _location;
950 int _annotations_present;
951 u2 _contended_group;
952
953 AnnotationCollector(Location location)
954 : _location(location), _annotations_present(0), _contended_group(0)
955 {
956 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
957 }
958 // If this annotation name has an ID, report it (or _none).
959 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
960 // Set the annotation name:
961 void set_annotation(ID id) {
1356 }
1357
1358 *constantvalue_index_addr = constantvalue_index;
1359 *is_synthetic_addr = is_synthetic;
1360 *generic_signature_index_addr = generic_signature_index;
1361 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1362 runtime_visible_annotations_length,
1363 CHECK);
1364 parsed_annotations->set_field_annotations(a);
1365 a = allocate_annotations(runtime_visible_type_annotations,
1366 runtime_visible_type_annotations_length,
1367 CHECK);
1368 parsed_annotations->set_field_type_annotations(a);
1369 return;
1370 }
1371
1372
1373 // Side-effects: populates the _fields, _fields_annotations,
1374 // _fields_type_annotations fields
1375 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1376 bool is_interface,
1377 ConstantPool* cp,
1378 const int cp_size,
1379 u2* const java_fields_count_ptr,
1380 TRAPS) {
1381
1382 assert(cfs != nullptr, "invariant");
1383 assert(cp != nullptr, "invariant");
1384 assert(java_fields_count_ptr != nullptr, "invariant");
1385
1386 assert(nullptr == _fields_annotations, "invariant");
1387 assert(nullptr == _fields_type_annotations, "invariant");
1388
1389 cfs->guarantee_more(2, CHECK); // length
1390 const u2 length = cfs->get_u2_fast();
1391 *java_fields_count_ptr = length;
1392
1393 int num_injected = 0;
1394 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1395 &num_injected);
1396 const int total_fields = length + num_injected;
1397
1398 // Allocate a temporary resource array to collect field data.
1399 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1400 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1401
1402 ResourceMark rm(THREAD);
1403 for (int n = 0; n < length; n++) {
1404 // access_flags, name_index, descriptor_index, attributes_count
1405 cfs->guarantee_more(8, CHECK);
1406
1407 AccessFlags access_flags;
1408 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1409 verify_legal_field_modifiers(flags, is_interface, CHECK);
1410 access_flags.set_flags(flags);
1411 FieldInfo::FieldFlags fieldFlags(0);
1412
1413 const u2 name_index = cfs->get_u2_fast();
1414 guarantee_property(valid_symbol_at(name_index),
1415 "Invalid constant pool index %u for field name in class file %s",
1416 name_index, CHECK);
1417 const Symbol* const name = cp->symbol_at(name_index);
1418 verify_legal_field_name(name, CHECK);
1419
1420 const u2 signature_index = cfs->get_u2_fast();
1421 guarantee_property(valid_symbol_at(signature_index),
1422 "Invalid constant pool index %u for field signature in class file %s",
1423 signature_index, CHECK);
1424 const Symbol* const sig = cp->symbol_at(signature_index);
1425 verify_legal_field_signature(name, sig, CHECK);
1426
1427 u2 constantvalue_index = 0;
1428 bool is_synthetic = false;
1429 u2 generic_signature_index = 0;
1430 const bool is_static = access_flags.is_static();
1431 FieldAnnotationCollector parsed_annotations(_loader_data);
1432
1433 const u2 attributes_count = cfs->get_u2_fast();
1434 if (attributes_count > 0) {
1435 parse_field_attributes(cfs,
1436 attributes_count,
1437 is_static,
1438 signature_index,
1439 &constantvalue_index,
1440 &is_synthetic,
1441 &generic_signature_index,
1442 &parsed_annotations,
1443 CHECK);
1444
1445 if (parsed_annotations.field_annotations() != nullptr) {
1446 if (_fields_annotations == nullptr) {
1447 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1448 _loader_data, length, nullptr,
1449 CHECK);
1450 }
1451 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1452 parsed_annotations.set_field_annotations(nullptr);
1453 }
1454 if (parsed_annotations.field_type_annotations() != nullptr) {
1455 if (_fields_type_annotations == nullptr) {
1456 _fields_type_annotations =
1457 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1458 length,
1459 nullptr,
1460 CHECK);
1461 }
1462 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1463 parsed_annotations.set_field_type_annotations(nullptr);
1464 }
1465
1466 if (is_synthetic) {
1467 access_flags.set_is_synthetic();
1468 }
1469 if (generic_signature_index != 0) {
1470 fieldFlags.update_generic(true);
1471 }
1472 }
1473
1474 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1475
1476 // Update number of static oop fields.
1477 if (is_static && is_reference_type(type)) {
1478 _static_oop_count++;
1479 }
1480
1481 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1482 fi.set_index(n);
1483 if (fieldFlags.is_generic()) {
1484 fi.set_generic_signature_index(generic_signature_index);
1485 }
1486 parsed_annotations.apply_to(&fi);
1487 if (fi.field_flags().is_contended()) {
1488 _has_contended_fields = true;
1489 }
1490 _temp_field_info->append(fi);
1491 }
1492 assert(_temp_field_info->length() == length, "Must be");
1493
1494 int index = length;
1495 if (num_injected != 0) {
1496 for (int n = 0; n < num_injected; n++) {
1497 // Check for duplicates
1498 if (injected[n].may_be_java) {
1499 const Symbol* const name = injected[n].name();
1500 const Symbol* const signature = injected[n].signature();
1501 bool duplicate = false;
1502 for (int i = 0; i < length; i++) {
1503 const FieldInfo* const f = _temp_field_info->adr_at(i);
1504 if (name == cp->symbol_at(f->name_index()) &&
1505 signature == cp->symbol_at(f->signature_index())) {
1506 // Symbol is desclared in Java so skip this one
1507 duplicate = true;
1508 break;
1509 }
1510 }
1511 if (duplicate) {
1512 // These will be removed from the field array at the end
1513 continue;
1514 }
1515 }
1516
1517 // Injected field
1518 FieldInfo::FieldFlags fflags(0);
1519 fflags.update_injected(true);
1520 AccessFlags aflags;
1521 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1522 fi.set_index(index);
1523 _temp_field_info->append(fi);
1524 index++;
1525 }
1526 }
1527
1528 assert(_temp_field_info->length() == index, "Must be");
1529
1530 if (_need_verify && length > 1) {
1531 // Check duplicated fields
1532 ResourceMark rm(THREAD);
1533 // Set containing name-signature pairs
1534 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1535 for (int i = 0; i < _temp_field_info->length(); i++) {
1536 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1537 _temp_field_info->adr_at(i)->signature(_cp));
1538 // If no duplicates, add name/signature in hashtable names_and_sigs.
1539 if(!names_and_sigs->put(name_and_sig, 0)) {
1540 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1541 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1542 return;
1543 }
1544 }
1545 }
1546 }
1547
1548
1893 }
1894 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1895 if (_location != _in_field && _location != _in_class) {
1896 break; // only allow for fields and classes
1897 }
1898 if (!EnableContended || (RestrictContended && !privileged)) {
1899 break; // honor privileges
1900 }
1901 return _jdk_internal_vm_annotation_Contended;
1902 }
1903 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1904 if (_location != _in_method) break; // only allow for methods
1905 if (RestrictReservedStack && !privileged) break; // honor privileges
1906 return _jdk_internal_vm_annotation_ReservedStackAccess;
1907 }
1908 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1909 if (_location != _in_class) break; // only allow for classes
1910 if (!privileged) break; // only allow in privileged code
1911 return _jdk_internal_ValueBased;
1912 }
1913 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1914 return _java_lang_Deprecated;
1915 }
1916 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1917 if (_location != _in_class) break; // only allow for classes
1918 if (!privileged) break; // only allow in privileged code
1919 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1920 }
1921 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1922 if (_location != _in_method) break; // only allow for methods
1923 if (!privileged) break; // only allow in privileged code
1924 return _method_AOTRuntimeSetup;
1925 }
1926 default: {
1927 break;
1928 }
1929 }
1930 return AnnotationCollector::_unknown;
1931 }
1932
2132 }
2133
2134 if (runtime_visible_type_annotations_length > 0) {
2135 a = allocate_annotations(runtime_visible_type_annotations,
2136 runtime_visible_type_annotations_length,
2137 CHECK);
2138 cm->set_type_annotations(a);
2139 }
2140 }
2141
2142
2143 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2144 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2145 // Method* to save footprint, so we only know the size of the resulting Method* when the
2146 // entire method attribute is parsed.
2147 //
2148 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2149
2150 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2151 bool is_interface,
2152 const ConstantPool* cp,
2153 bool* const has_localvariable_table,
2154 TRAPS) {
2155 assert(cfs != nullptr, "invariant");
2156 assert(cp != nullptr, "invariant");
2157 assert(has_localvariable_table != nullptr, "invariant");
2158
2159 ResourceMark rm(THREAD);
2160 // Parse fixed parts:
2161 // access_flags, name_index, descriptor_index, attributes_count
2162 cfs->guarantee_more(8, CHECK_NULL);
2163
2164 u2 flags = cfs->get_u2_fast();
2165 const u2 name_index = cfs->get_u2_fast();
2166 const int cp_size = cp->length();
2167 guarantee_property(
2168 valid_symbol_at(name_index),
2169 "Illegal constant pool index %u for method name in class file %s",
2170 name_index, CHECK_NULL);
2171 const Symbol* const name = cp->symbol_at(name_index);
2173
2174 const u2 signature_index = cfs->get_u2_fast();
2175 guarantee_property(
2176 valid_symbol_at(signature_index),
2177 "Illegal constant pool index %u for method signature in class file %s",
2178 signature_index, CHECK_NULL);
2179 const Symbol* const signature = cp->symbol_at(signature_index);
2180
2181 if (name == vmSymbols::class_initializer_name()) {
2182 // We ignore the other access flags for a valid class initializer.
2183 // (JVM Spec 2nd ed., chapter 4.6)
2184 if (_major_version < 51) { // backward compatibility
2185 flags = JVM_ACC_STATIC;
2186 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2187 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2188 } else {
2189 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2190 return nullptr;
2191 }
2192 } else {
2193 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2194 }
2195
2196 if (name == vmSymbols::object_initializer_name() && is_interface) {
2197 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2198 return nullptr;
2199 }
2200
2201 int args_size = -1; // only used when _need_verify is true
2202 if (_need_verify) {
2203 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2204 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2205 verify_legal_method_signature(name, signature, CHECK_NULL);
2206 if (args_size > MAX_ARGS_SIZE) {
2207 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2208 return nullptr;
2209 }
2210 }
2211
2212 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2213
2214 // Default values for code and exceptions attribute elements
2215 u2 max_stack = 0;
2216 u2 max_locals = 0;
2217 u4 code_length = 0;
2218 const u1* code_start = nullptr;
2219 u2 exception_table_length = 0;
2220 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2715 CHECK_NULL);
2716
2717 if (InstanceKlass::is_finalization_enabled() &&
2718 name == vmSymbols::finalize_method_name() &&
2719 signature == vmSymbols::void_method_signature()) {
2720 if (m->is_empty_method()) {
2721 _has_empty_finalizer = true;
2722 } else {
2723 _has_finalizer = true;
2724 }
2725 }
2726
2727 NOT_PRODUCT(m->verify());
2728 return m;
2729 }
2730
2731
2732 // Side-effects: populates the _methods field in the parser
2733 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2734 bool is_interface,
2735 bool* const has_localvariable_table,
2736 bool* has_final_method,
2737 bool* declares_nonstatic_concrete_methods,
2738 TRAPS) {
2739 assert(cfs != nullptr, "invariant");
2740 assert(has_localvariable_table != nullptr, "invariant");
2741 assert(has_final_method != nullptr, "invariant");
2742 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2743
2744 assert(nullptr == _methods, "invariant");
2745
2746 cfs->guarantee_more(2, CHECK); // length
2747 const u2 length = cfs->get_u2_fast();
2748 if (length == 0) {
2749 _methods = Universe::the_empty_method_array();
2750 } else {
2751 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2752 length,
2753 nullptr,
2754 CHECK);
2755
2756 for (int index = 0; index < length; index++) {
2757 Method* method = parse_method(cfs,
2758 is_interface,
2759 _cp,
2760 has_localvariable_table,
2761 CHECK);
2762
2763 if (method->is_final()) {
2764 *has_final_method = true;
2765 }
2766 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2767 // used for interface initialization, and default method inheritance analysis
2768 if (is_interface && !(*declares_nonstatic_concrete_methods)
2769 && !method->is_abstract() && !method->is_static()) {
2770 *declares_nonstatic_concrete_methods = true;
2771 }
2772 _methods->at_put(index, method);
2773 }
2774
2775 if (_need_verify && length > 1) {
2776 // Check duplicated methods
2777 ResourceMark rm(THREAD);
2778 // Set containing name-signature pairs
3004 valid_klass_reference_at(outer_class_info_index),
3005 "outer_class_info_index %u has bad constant type in class file %s",
3006 outer_class_info_index, CHECK_0);
3007
3008 if (outer_class_info_index != 0) {
3009 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3010 char* bytes = (char*)outer_class_name->bytes();
3011 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3012 "Outer class is an array class in class file %s", CHECK_0);
3013 }
3014 // Inner class name
3015 const u2 inner_name_index = cfs->get_u2_fast();
3016 guarantee_property(
3017 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3018 "inner_name_index %u has bad constant type in class file %s",
3019 inner_name_index, CHECK_0);
3020 if (_need_verify) {
3021 guarantee_property(inner_class_info_index != outer_class_info_index,
3022 "Class is both outer and inner class in class file %s", CHECK_0);
3023 }
3024 // Access flags
3025 u2 flags;
3026 // JVM_ACC_MODULE is defined in JDK-9 and later.
3027 if (_major_version >= JAVA_9_VERSION) {
3028 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3029 } else {
3030 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3031 }
3032 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3033 // Set abstract bit for old class files for backward compatibility
3034 flags |= JVM_ACC_ABSTRACT;
3035 }
3036
3037 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3038 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3039 AccessFlags inner_access_flags(flags);
3040
3041 inner_classes->at_put(index++, inner_class_info_index);
3042 inner_classes->at_put(index++, outer_class_info_index);
3043 inner_classes->at_put(index++, inner_name_index);
3044 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3045 }
3046
3047 // Check for circular and duplicate entries.
3048 bool has_circularity = false;
3049 if (_need_verify) {
3050 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3051 if (has_circularity) {
3052 // If circularity check failed then ignore InnerClasses attribute.
3053 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3054 index = 0;
3055 if (parsed_enclosingmethod_attribute) {
3056 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3122 if (length > 0) {
3123 int index = 0;
3124 cfs->guarantee_more(2 * length, CHECK_0);
3125 for (int n = 0; n < length; n++) {
3126 const u2 class_info_index = cfs->get_u2_fast();
3127 guarantee_property(
3128 valid_klass_reference_at(class_info_index),
3129 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3130 class_info_index, CHECK_0);
3131 permitted_subclasses->at_put(index++, class_info_index);
3132 }
3133 assert(index == size, "wrong size");
3134 }
3135
3136 // Restore buffer's current position.
3137 cfs->set_current(current_mark);
3138
3139 return length;
3140 }
3141
3142 // Record {
3143 // u2 attribute_name_index;
3144 // u4 attribute_length;
3145 // u2 components_count;
3146 // component_info components[components_count];
3147 // }
3148 // component_info {
3149 // u2 name_index;
3150 // u2 descriptor_index
3151 // u2 attributes_count;
3152 // attribute_info_attributes[attributes_count];
3153 // }
3154 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3155 const ConstantPool* cp,
3156 const u1* const record_attribute_start,
3157 TRAPS) {
3158 const u1* const current_mark = cfs->current();
3159 int components_count = 0;
3160 unsigned int calculate_attr_size = 0;
3161 if (record_attribute_start != nullptr) {
3372 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3373 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3374 "Bad length on BootstrapMethods in class file %s",
3375 CHECK);
3376 }
3377
3378 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3379 ConstantPool* cp,
3380 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3381 TRAPS) {
3382 assert(cfs != nullptr, "invariant");
3383 assert(cp != nullptr, "invariant");
3384 assert(parsed_annotations != nullptr, "invariant");
3385
3386 // Set inner classes attribute to default sentinel
3387 _inner_classes = Universe::the_empty_short_array();
3388 // Set nest members attribute to default sentinel
3389 _nest_members = Universe::the_empty_short_array();
3390 // Set _permitted_subclasses attribute to default sentinel
3391 _permitted_subclasses = Universe::the_empty_short_array();
3392 cfs->guarantee_more(2, CHECK); // attributes_count
3393 u2 attributes_count = cfs->get_u2_fast();
3394 bool parsed_sourcefile_attribute = false;
3395 bool parsed_innerclasses_attribute = false;
3396 bool parsed_nest_members_attribute = false;
3397 bool parsed_permitted_subclasses_attribute = false;
3398 bool parsed_nest_host_attribute = false;
3399 bool parsed_record_attribute = false;
3400 bool parsed_enclosingmethod_attribute = false;
3401 bool parsed_bootstrap_methods_attribute = false;
3402 const u1* runtime_visible_annotations = nullptr;
3403 int runtime_visible_annotations_length = 0;
3404 const u1* runtime_visible_type_annotations = nullptr;
3405 int runtime_visible_type_annotations_length = 0;
3406 bool runtime_invisible_type_annotations_exists = false;
3407 bool runtime_invisible_annotations_exists = false;
3408 bool parsed_source_debug_ext_annotations_exist = false;
3409 const u1* inner_classes_attribute_start = nullptr;
3410 u4 inner_classes_attribute_length = 0;
3411 u2 enclosing_method_class_index = 0;
3412 u2 enclosing_method_method_index = 0;
3413 const u1* nest_members_attribute_start = nullptr;
3414 u4 nest_members_attribute_length = 0;
3415 const u1* record_attribute_start = nullptr;
3416 u4 record_attribute_length = 0;
3417 const u1* permitted_subclasses_attribute_start = nullptr;
3418 u4 permitted_subclasses_attribute_length = 0;
3419
3420 // Iterate over attributes
3421 while (attributes_count--) {
3422 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3423 const u2 attribute_name_index = cfs->get_u2_fast();
3424 const u4 attribute_length = cfs->get_u4_fast();
3425 guarantee_property(
3426 valid_symbol_at(attribute_name_index),
3427 "Attribute name has bad constant pool index %u in class file %s",
3428 attribute_name_index, CHECK);
3429 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3430 if (tag == vmSymbols::tag_source_file()) {
3431 // Check for SourceFile tag
3432 if (_need_verify) {
3433 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3434 }
3435 if (parsed_sourcefile_attribute) {
3436 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3437 return;
3438 } else {
3614 return;
3615 }
3616 parsed_record_attribute = true;
3617 record_attribute_start = cfs->current();
3618 record_attribute_length = attribute_length;
3619 } else if (_major_version >= JAVA_17_VERSION) {
3620 if (tag == vmSymbols::tag_permitted_subclasses()) {
3621 if (parsed_permitted_subclasses_attribute) {
3622 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3623 return;
3624 }
3625 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3626 if (_access_flags.is_final()) {
3627 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3628 return;
3629 }
3630 parsed_permitted_subclasses_attribute = true;
3631 permitted_subclasses_attribute_start = cfs->current();
3632 permitted_subclasses_attribute_length = attribute_length;
3633 }
3634 }
3635 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3636 cfs->skip_u1(attribute_length, CHECK);
3637 } else {
3638 // Unknown attribute
3639 cfs->skip_u1(attribute_length, CHECK);
3640 }
3641 } else {
3642 // Unknown attribute
3643 cfs->skip_u1(attribute_length, CHECK);
3644 }
3645 } else {
3646 // Unknown attribute
3647 cfs->skip_u1(attribute_length, CHECK);
3648 }
3649 }
3650 _class_annotations = allocate_annotations(runtime_visible_annotations,
3651 runtime_visible_annotations_length,
3652 CHECK);
3653 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3690 CHECK);
3691 if (_need_verify) {
3692 guarantee_property(record_attribute_length == calculated_attr_length,
3693 "Record attribute has wrong length in class file %s",
3694 CHECK);
3695 }
3696 }
3697
3698 if (parsed_permitted_subclasses_attribute) {
3699 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3700 cfs,
3701 permitted_subclasses_attribute_start,
3702 CHECK);
3703 if (_need_verify) {
3704 guarantee_property(
3705 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3706 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3707 }
3708 }
3709
3710 if (_max_bootstrap_specifier_index >= 0) {
3711 guarantee_property(parsed_bootstrap_methods_attribute,
3712 "Missing BootstrapMethods attribute in class file %s", CHECK);
3713 }
3714 }
3715
3716 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3717 assert(k != nullptr, "invariant");
3718
3719 if (_synthetic_flag)
3720 k->set_is_synthetic();
3721 if (_sourcefile_index != 0) {
3722 k->set_source_file_name_index(_sourcefile_index);
3723 }
3724 if (_generic_signature_index != 0) {
3725 k->set_generic_signature_index(_generic_signature_index);
3726 }
3727 if (_sde_buffer != nullptr) {
3728 k->set_source_debug_extension(_sde_buffer, _sde_length);
3729 }
3756 _class_type_annotations = nullptr;
3757 _fields_annotations = nullptr;
3758 _fields_type_annotations = nullptr;
3759 }
3760
3761 // Transfer ownership of metadata allocated to the InstanceKlass.
3762 void ClassFileParser::apply_parsed_class_metadata(
3763 InstanceKlass* this_klass,
3764 int java_fields_count) {
3765 assert(this_klass != nullptr, "invariant");
3766
3767 _cp->set_pool_holder(this_klass);
3768 this_klass->set_constants(_cp);
3769 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3770 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3771 this_klass->set_fields_status(_fields_status);
3772 this_klass->set_methods(_methods);
3773 this_klass->set_inner_classes(_inner_classes);
3774 this_klass->set_nest_members(_nest_members);
3775 this_klass->set_nest_host_index(_nest_host);
3776 this_klass->set_annotations(_combined_annotations);
3777 this_klass->set_permitted_subclasses(_permitted_subclasses);
3778 this_klass->set_record_components(_record_components);
3779
3780 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3781
3782 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3783 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3784 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3785 // its _super. If an OOM occurs while loading the current klass, its _super field
3786 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3787 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3788 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3789
3790 // Clear out these fields so they don't get deallocated by the destructor
3791 clear_class_metadata();
3792 }
3793
3794 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3795 int anno_length,
3796 TRAPS) {
3797 AnnotationArray* annotations = nullptr;
3798 if (anno != nullptr) {
3799 annotations = MetadataFactory::new_array<u1>(_loader_data,
3800 anno_length,
3801 CHECK_(annotations));
3802 for (int i = 0; i < anno_length; i++) {
3803 annotations->at_put(i, anno[i]);
3804 }
3805 }
3806 return annotations;
3807 }
3808
3809 void ClassFileParser::check_super_class(ConstantPool* const cp,
3810 const int super_class_index,
3811 const bool need_verify,
3812 TRAPS) {
3813 assert(cp != nullptr, "invariant");
3814
3815 if (super_class_index == 0) {
3816 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3817 "Invalid superclass index %u in class file %s",
3818 super_class_index,
3819 CHECK);
3820 } else {
3821 guarantee_property(valid_klass_reference_at(super_class_index),
3822 "Invalid superclass index %u in class file %s",
3823 super_class_index,
3824 CHECK);
3825
3826 // The class name should be legal because it is checked when parsing constant pool.
3827 // However, make sure it is not an array type.
3828 if (need_verify) {
3829 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3830 "Bad superclass name in class file %s", CHECK);
3831 }
3832 }
3833 }
3834
3835 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3836 _max_nonstatic_oop_maps = max_blocks;
3837 _nonstatic_oop_map_count = 0;
3838 if (max_blocks == 0) {
3990 // See documentation of InstanceKlass::can_be_fastpath_allocated().
3991 assert(ik->size_helper() > 0, "layout_helper is initialized");
3992 if (ik->is_abstract() || ik->is_interface()
3993 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3994 || ik->size_helper() >= FastAllocateSizeLimit) {
3995 // Forbid fast-path allocation.
3996 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3997 ik->set_layout_helper(lh);
3998 }
3999
4000 // Propagate the AOT runtimeSetup method discovery
4001 if (_has_aot_runtime_setup_method) {
4002 ik->set_is_runtime_setup_required();
4003 if (log_is_enabled(Info, aot, init)) {
4004 ResourceMark rm;
4005 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4006 }
4007 }
4008 }
4009
4010 // utility methods for appending an array with check for duplicates
4011
4012 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4013 const Array<InstanceKlass*>* const ifs) {
4014 // iterate over new interfaces
4015 for (int i = 0; i < ifs->length(); i++) {
4016 InstanceKlass* const e = ifs->at(i);
4017 assert(e->is_klass() && e->is_interface(), "just checking");
4018 // add new interface
4019 result->append_if_missing(e);
4020 }
4021 }
4022
4023 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4024 Array<InstanceKlass*>* local_ifs,
4025 ClassLoaderData* loader_data,
4026 TRAPS) {
4027 assert(local_ifs != nullptr, "invariant");
4028 assert(loader_data != nullptr, "invariant");
4029
4033 // Add superclass transitive interfaces size
4034 if (super != nullptr) {
4035 super_size = super->transitive_interfaces()->length();
4036 max_transitive_size += super_size;
4037 }
4038 // Add local interfaces' super interfaces
4039 const int local_size = local_ifs->length();
4040 for (int i = 0; i < local_size; i++) {
4041 InstanceKlass* const l = local_ifs->at(i);
4042 max_transitive_size += l->transitive_interfaces()->length();
4043 }
4044 // Finally add local interfaces
4045 max_transitive_size += local_size;
4046 // Construct array
4047 if (max_transitive_size == 0) {
4048 // no interfaces, use canonicalized array
4049 return Universe::the_empty_instance_klass_array();
4050 } else if (max_transitive_size == super_size) {
4051 // no new local interfaces added, share superklass' transitive interface array
4052 return super->transitive_interfaces();
4053 } else if (max_transitive_size == local_size) {
4054 // only local interfaces added, share local interface array
4055 return local_ifs;
4056 } else {
4057 ResourceMark rm;
4058 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4059
4060 // Copy down from superclass
4061 if (super != nullptr) {
4062 append_interfaces(result, super->transitive_interfaces());
4063 }
4064
4065 // Copy down from local interfaces' superinterfaces
4066 for (int i = 0; i < local_size; i++) {
4067 InstanceKlass* const l = local_ifs->at(i);
4068 append_interfaces(result, l->transitive_interfaces());
4069 }
4070 // Finally add local interfaces
4071 append_interfaces(result, local_ifs);
4072
4073 // length will be less than the max_transitive_size if duplicates were removed
4074 const int length = result->length();
4075 assert(length <= max_transitive_size, "just checking");
4076 Array<InstanceKlass*>* const new_result =
4077 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4078 for (int i = 0; i < length; i++) {
4079 InstanceKlass* const e = result->at(i);
4080 assert(e != nullptr, "just checking");
4081 new_result->at_put(i, e);
4082 }
4083 return new_result;
4084 }
4085 }
4086
4087 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4088 assert(this_klass != nullptr, "invariant");
4089 const InstanceKlass* const super = this_klass->super();
4090
4091 if (super != nullptr) {
4092 if (super->is_final()) {
4093 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4094 return;
4095 }
4096
4097 if (super->is_sealed()) {
4098 stringStream ss;
4099 ResourceMark rm(THREAD);
4100 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4101 classfile_icce_error(ss.as_string(), THREAD);
4102 return;
4103 }
4104 }
4105
4106 Reflection::VerifyClassAccessResults vca_result =
4107 Reflection::verify_class_access(this_klass, super, false);
4108 if (vca_result != Reflection::ACCESS_OK) {
4109 ResourceMark rm(THREAD);
4110 char* msg = Reflection::verify_class_access_msg(this_klass,
4111 super,
4112 vca_result);
4113
4114 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4115 if (msg == nullptr) {
4116 bool same_module = (this_klass->module() == super->module());
4117 Exceptions::fthrow(
4118 THREAD_AND_LOCATION,
4119 vmSymbols::java_lang_IllegalAccessError(),
4120 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4121 this_klass->external_name(),
4122 super->is_abstract() ? "abstract " : "",
4123 super->external_name(),
4124 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4125 (same_module) ? "" : "; ",
4278 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4279 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4280 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4281 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4282 if (is_module) {
4283 ResourceMark rm(THREAD);
4284 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4285 Exceptions::fthrow(
4286 THREAD_AND_LOCATION,
4287 vmSymbols::java_lang_NoClassDefFoundError(),
4288 "%s is not a class because access_flag ACC_MODULE is set",
4289 _class_name->as_C_string());
4290 return;
4291 }
4292
4293 if (!_need_verify) { return; }
4294
4295 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4296 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4297 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4298 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4299 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4300 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4301 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4302
4303 if ((is_abstract && is_final) ||
4304 (is_interface && !is_abstract) ||
4305 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4306 (!is_interface && major_gte_1_5 && is_annotation)) {
4307 ResourceMark rm(THREAD);
4308 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4309 if (inner_name == nullptr && !is_anonymous_inner_class) {
4310 Exceptions::fthrow(
4311 THREAD_AND_LOCATION,
4312 vmSymbols::java_lang_ClassFormatError(),
4313 "Illegal class modifiers in class %s: 0x%X",
4314 _class_name->as_C_string(), flags
4315 );
4316 } else {
4317 if (is_anonymous_inner_class) {
4318 Exceptions::fthrow(
4319 THREAD_AND_LOCATION,
4320 vmSymbols::java_lang_ClassFormatError(),
4321 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4322 _class_name->as_C_string(), flags
4323 );
4324 } else {
4325 Exceptions::fthrow(
4326 THREAD_AND_LOCATION,
4381 THREAD_AND_LOCATION,
4382 vmSymbols::java_lang_UnsupportedClassVersionError(),
4383 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4384 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4385 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4386 return;
4387 }
4388
4389 if (!Arguments::enable_preview()) {
4390 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4391 class_name, major, minor, THREAD);
4392 return;
4393 }
4394
4395 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4396 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4397 class_name, major, minor, THREAD);
4398 }
4399 }
4400
4401 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4402 bool is_interface,
4403 TRAPS) const {
4404 if (!_need_verify) { return; }
4405
4406 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4407 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4408 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4409 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4410 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4411 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4412 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4413 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4414 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4415
4416 bool is_illegal = false;
4417
4418 if (is_interface) {
4419 if (!is_public || !is_static || !is_final || is_private ||
4420 is_protected || is_volatile || is_transient ||
4421 (major_gte_1_5 && is_enum)) {
4422 is_illegal = true;
4423 }
4424 } else { // not interface
4425 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4426 is_illegal = true;
4427 }
4428 }
4429
4430 if (is_illegal) {
4431 ResourceMark rm(THREAD);
4432 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4433 Exceptions::fthrow(
4434 THREAD_AND_LOCATION,
4435 vmSymbols::java_lang_ClassFormatError(),
4436 "Illegal field modifiers in class %s: 0x%X",
4437 _class_name->as_C_string(), flags);
4438 return;
4439 }
4440 }
4441
4442 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4443 bool is_interface,
4444 const Symbol* name,
4445 TRAPS) const {
4446 if (!_need_verify) { return; }
4447
4448 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4449 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4450 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4451 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4452 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4453 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4454 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4455 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4456 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4457 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4458 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4459 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4460 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4461 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4462
4463 bool is_illegal = false;
4464
4465 if (is_interface) {
4466 if (major_gte_8) {
4467 // Class file version is JAVA_8_VERSION or later Methods of
4468 // interfaces may set any of the flags except ACC_PROTECTED,
4469 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4470 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4471 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4472 (is_native || is_protected || is_final || is_synchronized) ||
4473 // If a specific method of a class or interface has its
4474 // ACC_ABSTRACT flag set, it must not have any of its
4475 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4476 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4477 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4478 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4479 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4480 is_illegal = true;
4481 }
4482 } else if (major_gte_1_5) {
4483 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4484 if (!is_public || is_private || is_protected || is_static || is_final ||
4485 is_synchronized || is_native || !is_abstract || is_strict) {
4486 is_illegal = true;
4487 }
4488 } else {
4489 // Class file version is pre-JAVA_1_5_VERSION
4490 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4491 is_illegal = true;
4492 }
4493 }
4494 } else { // not interface
4495 if (has_illegal_visibility(flags)) {
4496 is_illegal = true;
4497 } else {
4498 if (is_initializer) {
4499 if (is_static || is_final || is_synchronized || is_native ||
4500 is_abstract || (major_gte_1_5 && is_bridge)) {
4501 is_illegal = true;
4502 }
4503 } else { // not initializer
4504 if (is_abstract) {
4505 if ((is_final || is_native || is_private || is_static ||
4506 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4507 is_illegal = true;
4508 }
4509 }
4510 }
4511 }
4512 }
4513
4514 if (is_illegal) {
4515 ResourceMark rm(THREAD);
4516 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4517 Exceptions::fthrow(
4518 THREAD_AND_LOCATION,
4519 vmSymbols::java_lang_ClassFormatError(),
4520 "Method %s in class %s has illegal modifiers: 0x%X",
4521 name->as_C_string(), _class_name->as_C_string(), flags);
4522 return;
4523 }
4524 }
4525
4526 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4527 int length,
4528 TRAPS) const {
4529 assert(_need_verify, "only called when _need_verify is true");
4530 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4531 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4532 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4533 }
4534 }
4535
4536 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4537 // In class names, '/' separates unqualified names. This is verified in this function also.
4538 // Method names also may not contain the characters '<' or '>', unless <init>
4539 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4540 // method. Because these names have been checked as special cases before
4541 // calling this method in verify_legal_method_name.
4559 if (type == ClassFileParser::LegalClass) {
4560 if (p == name || p+1 >= name+length ||
4561 *(p+1) == JVM_SIGNATURE_SLASH) {
4562 return false;
4563 }
4564 } else {
4565 return false; // do not permit '/' unless it's class name
4566 }
4567 break;
4568 case JVM_SIGNATURE_SPECIAL:
4569 case JVM_SIGNATURE_ENDSPECIAL:
4570 // do not permit '<' or '>' in method names
4571 if (type == ClassFileParser::LegalMethod) {
4572 return false;
4573 }
4574 }
4575 }
4576 return true;
4577 }
4578
4579 // Take pointer to a UTF8 byte string (not NUL-terminated).
4580 // Skip over the longest part of the string that could
4581 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4582 // Return a pointer to just past the fieldname.
4583 // Return null if no fieldname at all was found, or in the case of slash_ok
4584 // being true, we saw consecutive slashes (meaning we were looking for a
4585 // qualified path but found something that was badly-formed).
4586 static const char* skip_over_field_name(const char* const name,
4587 bool slash_ok,
4588 unsigned int length) {
4589 const char* p;
4590 jboolean last_is_slash = false;
4591 jboolean not_first_ch = false;
4592
4593 for (p = name; p != name + length; not_first_ch = true) {
4594 const char* old_p = p;
4595 jchar ch = *p;
4596 if (ch < 128) {
4597 p++;
4598 // quick check for ascii
4660 // be taken as a field signature. Allow "void" if void_ok.
4661 // Return a pointer to just past the signature.
4662 // Return null if no legal signature is found.
4663 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4664 bool void_ok,
4665 unsigned int length,
4666 TRAPS) const {
4667 unsigned int array_dim = 0;
4668 while (length > 0) {
4669 switch (signature[0]) {
4670 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4671 case JVM_SIGNATURE_BOOLEAN:
4672 case JVM_SIGNATURE_BYTE:
4673 case JVM_SIGNATURE_CHAR:
4674 case JVM_SIGNATURE_SHORT:
4675 case JVM_SIGNATURE_INT:
4676 case JVM_SIGNATURE_FLOAT:
4677 case JVM_SIGNATURE_LONG:
4678 case JVM_SIGNATURE_DOUBLE:
4679 return signature + 1;
4680 case JVM_SIGNATURE_CLASS: {
4681 if (_major_version < JAVA_1_5_VERSION) {
4682 signature++;
4683 length--;
4684 // Skip over the class name if one is there
4685 const char* const p = skip_over_field_name(signature, true, length);
4686 assert(p == nullptr || p > signature, "must parse one character at least");
4687 // The next character better be a semicolon
4688 if (p != nullptr && // Parse of field name succeeded.
4689 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4690 p[0] == JVM_SIGNATURE_ENDCLASS) {
4691 return p + 1;
4692 }
4693 }
4694 else {
4695 // Skip leading 'L' and ignore first appearance of ';'
4696 signature++;
4697 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4698 // Format check signature
4699 if (c != nullptr) {
4700 int newlen = pointer_delta_as_int(c, (char*) signature);
4701 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4702 if (!legal) {
4703 classfile_parse_error("Class name is empty or contains illegal character "
4704 "in descriptor in class file %s",
4705 THREAD);
4706 return nullptr;
4707 }
4708 return signature + newlen + 1;
4709 }
4710 }
4711 return nullptr;
4712 }
4713 case JVM_SIGNATURE_ARRAY:
4714 array_dim++;
4715 if (array_dim > 255) {
4798 THREAD_AND_LOCATION,
4799 vmSymbols::java_lang_ClassFormatError(),
4800 "Illegal field name \"%.*s\" in class %s", length, bytes,
4801 _class_name->as_C_string()
4802 );
4803 return;
4804 }
4805 }
4806
4807 // Checks if name is a legal method name.
4808 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4809 if (!_need_verify) { return; }
4810
4811 assert(name != nullptr, "method name is null");
4812 char* bytes = (char*)name->bytes();
4813 unsigned int length = name->utf8_length();
4814 bool legal = false;
4815
4816 if (length > 0) {
4817 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4818 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4819 legal = true;
4820 }
4821 } else if (_major_version < JAVA_1_5_VERSION) {
4822 const char* p;
4823 p = skip_over_field_name(bytes, false, length);
4824 legal = (p != nullptr) && ((p - bytes) == (int)length);
4825 } else {
4826 // 4881221: relax the constraints based on JSR202 spec
4827 legal = verify_unqualified_name(bytes, length, LegalMethod);
4828 }
4829 }
4830
4831 if (!legal) {
4832 ResourceMark rm(THREAD);
4833 assert(_class_name != nullptr, "invariant");
4834 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4835 Exceptions::fthrow(
4836 THREAD_AND_LOCATION,
4837 vmSymbols::java_lang_ClassFormatError(),
4838 "Illegal method name \"%.*s\" in class %s", length, bytes,
4839 _class_name->as_C_string()
4840 );
4841 return;
4842 }
4843 }
4844
4845
4846 // Checks if signature is a legal field signature.
4847 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4848 const Symbol* signature,
4849 TRAPS) const {
4850 if (!_need_verify) { return; }
4851
4852 const char* const bytes = (const char*)signature->bytes();
4853 const unsigned int length = signature->utf8_length();
4854 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4855
4856 if (p == nullptr || (p - bytes) != (int)length) {
4857 throwIllegalSignature("Field", name, signature, CHECK);
4858 }
4859 }
4860
4861 // Check that the signature is compatible with the method name. For example,
4862 // check that <init> has a void signature.
4863 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4864 const Symbol* signature,
4865 TRAPS) const {
4866 if (!_need_verify) {
4867 return;
4868 }
4869
4870 // Class initializers cannot have args for class format version >= 51.
4871 if (name == vmSymbols::class_initializer_name() &&
4872 signature != vmSymbols::void_method_signature() &&
4873 _major_version >= JAVA_7_VERSION) {
4874 throwIllegalSignature("Method", name, signature, THREAD);
4875 return;
4876 }
4877
4878 int sig_length = signature->utf8_length();
4879 if (name->utf8_length() > 0 &&
4880 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4881 sig_length > 0 &&
4882 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4883 throwIllegalSignature("Method", name, signature, THREAD);
4884 }
4885 }
4886
4887 // Checks if signature is a legal method signature.
4888 // Returns number of parameters
4889 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
4890 const Symbol* signature,
4891 TRAPS) const {
4892 if (!_need_verify) {
4893 // make sure caller's args_size will be less than 0 even for non-static
4894 // method so it will be recomputed in compute_size_of_parameters().
4895 return -2;
4896 }
4897
4898 unsigned int args_size = 0;
4899 const char* p = (const char*)signature->bytes();
4900 unsigned int length = signature->utf8_length();
4901 const char* nextp;
4902
4913 length -= pointer_delta_as_int(nextp, p);
4914 p = nextp;
4915 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4916 }
4917 // The first non-signature thing better be a ')'
4918 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4919 length--;
4920 // Now we better just have a return value
4921 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4922 if (nextp && ((int)length == (nextp - p))) {
4923 return args_size;
4924 }
4925 }
4926 }
4927 // Report error
4928 throwIllegalSignature("Method", name, signature, THREAD);
4929 return 0;
4930 }
4931
4932 int ClassFileParser::static_field_size() const {
4933 assert(_field_info != nullptr, "invariant");
4934 return _field_info->_static_field_size;
4935 }
4936
4937 int ClassFileParser::total_oop_map_count() const {
4938 assert(_field_info != nullptr, "invariant");
4939 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4940 }
4941
4942 jint ClassFileParser::layout_size() const {
4943 assert(_field_info != nullptr, "invariant");
4944 return _field_info->_instance_size;
4945 }
4946
4947 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4948 const Array<Method*>* methods) {
4949 assert(ik != nullptr, "invariant");
4950 assert(methods != nullptr, "invariant");
4951
4952 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4953 // (We used to do this lazily, but now we query it in Rewriter,
4954 // which is eagerly done for every method, so we might as well do it now,
4955 // when everything is fresh in memory.)
4956 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4957
4958 if (klass_id != vmSymbolID::NO_SID) {
4959 for (int j = 0; j < methods->length(); ++j) {
4960 Method* method = methods->at(j);
4961 method->init_intrinsic_id(klass_id);
4962
4963 if (CheckIntrinsics) {
4964 // Check if an intrinsic is defined for method 'method',
5039 }
5040 }
5041
5042 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5043 const ClassInstanceInfo& cl_inst_info,
5044 TRAPS) {
5045 if (_klass != nullptr) {
5046 return _klass;
5047 }
5048
5049 InstanceKlass* const ik =
5050 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5051
5052 if (is_hidden()) {
5053 mangle_hidden_class_name(ik);
5054 }
5055
5056 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5057
5058 assert(_klass == ik, "invariant");
5059
5060 return ik;
5061 }
5062
5063 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5064 bool changed_by_loadhook,
5065 const ClassInstanceInfo& cl_inst_info,
5066 TRAPS) {
5067 assert(ik != nullptr, "invariant");
5068
5069 // Set name and CLD before adding to CLD
5070 ik->set_class_loader_data(_loader_data);
5071 ik->set_class_loader_type();
5072 ik->set_name(_class_name);
5073
5074 // Add all classes to our internal class loader list here,
5075 // including classes in the bootstrap (null) class loader.
5076 const bool publicize = !is_internal();
5077
5078 _loader_data->add_class(ik, publicize);
5079
5080 set_klass_to_deallocate(ik);
5081
5082 assert(_field_info != nullptr, "invariant");
5083 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5084 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5085 "sanity");
5086
5087 assert(ik->is_instance_klass(), "sanity");
5088 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5089
5090 // Fill in information already parsed
5091 ik->set_should_verify_class(_need_verify);
5092
5093 // Not yet: supers are done below to support the new subtype-checking fields
5094 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5095 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5096 ik->set_static_oop_field_count(_static_oop_count);
5097
5098 // this transfers ownership of a lot of arrays from
5099 // the parser onto the InstanceKlass*
5100 apply_parsed_class_metadata(ik, _java_fields_count);
5101
5102 // can only set dynamic nest-host after static nest information is set
5103 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5104 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5105 }
5106
5107 // note that is not safe to use the fields in the parser from this point on
5108 assert(nullptr == _cp, "invariant");
5109 assert(nullptr == _fieldinfo_stream, "invariant");
5110 assert(nullptr == _fieldinfo_search_table, "invariant");
5111 assert(nullptr == _fields_status, "invariant");
5112 assert(nullptr == _methods, "invariant");
5113 assert(nullptr == _inner_classes, "invariant");
5114 assert(nullptr == _nest_members, "invariant");
5115 assert(nullptr == _combined_annotations, "invariant");
5116 assert(nullptr == _record_components, "invariant");
5117 assert(nullptr == _permitted_subclasses, "invariant");
5118
5119 if (_has_localvariable_table) {
5120 ik->set_has_localvariable_table(true);
5121 }
5122
5123 if (_has_final_method) {
5124 ik->set_has_final_method();
5125 }
5126
5127 ik->copy_method_ordering(_method_ordering, CHECK);
5128 // The InstanceKlass::_methods_jmethod_ids cache
5129 // is managed on the assumption that the initial cache
5130 // size is equal to the number of methods in the class. If
5131 // that changes, then InstanceKlass::idnum_can_increment()
5132 // has to be changed accordingly.
5133 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5134
5135 ik->set_this_class_index(_this_class_index);
5136
5137 if (_is_hidden) {
5174 if ((_num_miranda_methods > 0) ||
5175 // if this class introduced new miranda methods or
5176 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5177 // super class exists and this class inherited miranda methods
5178 ) {
5179 ik->set_has_miranda_methods(); // then set a flag
5180 }
5181
5182 // Fill in information needed to compute superclasses.
5183 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5184 ik->set_transitive_interfaces(_transitive_interfaces);
5185 ik->set_local_interfaces(_local_interfaces);
5186 _transitive_interfaces = nullptr;
5187 _local_interfaces = nullptr;
5188
5189 // Initialize itable offset tables
5190 klassItable::setup_itable_offset_table(ik);
5191
5192 // Compute transitive closure of interfaces this class implements
5193 // Do final class setup
5194 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5195 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5196 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5197 }
5198
5199 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5200 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5201 ik->set_has_contended_annotations(true);
5202 }
5203
5204 // Fill in has_finalizer and layout_helper
5205 set_precomputed_flags(ik);
5206
5207 // check if this class can access its super class
5208 check_super_class_access(ik, CHECK);
5209
5210 // check if this class can access its superinterfaces
5211 check_super_interface_access(ik, CHECK);
5212
5213 // check if this class overrides any final method
5214 check_final_method_override(ik, CHECK);
5235
5236 assert(_all_mirandas != nullptr, "invariant");
5237
5238 // Generate any default methods - default methods are public interface methods
5239 // that have a default implementation. This is new with Java 8.
5240 if (_has_nonstatic_concrete_methods) {
5241 DefaultMethods::generate_default_methods(ik,
5242 _all_mirandas,
5243 CHECK);
5244 }
5245
5246 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5247 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5248 !module_entry->has_default_read_edges()) {
5249 if (!module_entry->set_has_default_read_edges()) {
5250 // We won a potential race
5251 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5252 }
5253 }
5254
5255 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5256
5257 if (!is_internal()) {
5258 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5259
5260 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5261 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5262 log_is_enabled(Info, class, preview)) {
5263 ResourceMark rm;
5264 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5265 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5266 }
5267
5268 if (log_is_enabled(Debug, class, resolve)) {
5269 ResourceMark rm;
5270 // print out the superclass.
5271 const char * from = ik->external_name();
5272 if (ik->super() != nullptr) {
5273 log_debug(class, resolve)("%s %s (super)",
5274 from,
5315 const ClassLoadInfo* cl_info,
5316 Publicity pub_level,
5317 TRAPS) :
5318 _stream(stream),
5319 _class_name(nullptr),
5320 _loader_data(loader_data),
5321 _is_hidden(cl_info->is_hidden()),
5322 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5323 _orig_cp_size(0),
5324 _static_oop_count(0),
5325 _super_klass(),
5326 _cp(nullptr),
5327 _fieldinfo_stream(nullptr),
5328 _fieldinfo_search_table(nullptr),
5329 _fields_status(nullptr),
5330 _methods(nullptr),
5331 _inner_classes(nullptr),
5332 _nest_members(nullptr),
5333 _nest_host(0),
5334 _permitted_subclasses(nullptr),
5335 _record_components(nullptr),
5336 _local_interfaces(nullptr),
5337 _transitive_interfaces(nullptr),
5338 _combined_annotations(nullptr),
5339 _class_annotations(nullptr),
5340 _class_type_annotations(nullptr),
5341 _fields_annotations(nullptr),
5342 _fields_type_annotations(nullptr),
5343 _klass(nullptr),
5344 _klass_to_deallocate(nullptr),
5345 _parsed_annotations(nullptr),
5346 _field_info(nullptr),
5347 _temp_field_info(nullptr),
5348 _method_ordering(nullptr),
5349 _all_mirandas(nullptr),
5350 _vtable_size(0),
5351 _itable_size(0),
5352 _num_miranda_methods(0),
5353 _protection_domain(cl_info->protection_domain()),
5354 _access_flags(),
5355 _pub_level(pub_level),
5356 _bad_constant_seen(0),
5357 _synthetic_flag(false),
5358 _sde_length(false),
5359 _sde_buffer(nullptr),
5360 _sourcefile_index(0),
5361 _generic_signature_index(0),
5362 _major_version(0),
5363 _minor_version(0),
5364 _this_class_index(0),
5365 _super_class_index(0),
5366 _itfs_len(0),
5367 _java_fields_count(0),
5368 _need_verify(false),
5369 _has_nonstatic_concrete_methods(false),
5370 _declares_nonstatic_concrete_methods(false),
5371 _has_localvariable_table(false),
5372 _has_final_method(false),
5373 _has_contended_fields(false),
5374 _has_aot_runtime_setup_method(false),
5375 _has_finalizer(false),
5376 _has_empty_finalizer(false),
5377 _max_bootstrap_specifier_index(-1) {
5378
5379 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5380 _class_name->increment_refcount();
5381
5382 assert(_loader_data != nullptr, "invariant");
5383 assert(stream != nullptr, "invariant");
5384 assert(_stream != nullptr, "invariant");
5385 assert(_stream->buffer() == _stream->current(), "invariant");
5386 assert(_class_name != nullptr, "invariant");
5387 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5388
5389 // Figure out whether we can skip format checking (matching classic VM behavior)
5390 // Always verify CFLH bytes from the user agents.
5391 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5392
5393 // synch back verification state to stream to check for truncation.
5394 stream->set_need_verify(_need_verify);
5395
5396 parse_stream(stream, CHECK);
5397
5398 post_process_parsed_stream(stream, _cp, CHECK);
5399 }
5400
5401 void ClassFileParser::clear_class_metadata() {
5402 // metadata created before the instance klass is created. Must be
5403 // deallocated if classfile parsing returns an error.
5404 _cp = nullptr;
5405 _fieldinfo_stream = nullptr;
5406 _fieldinfo_search_table = nullptr;
5407 _fields_status = nullptr;
5408 _methods = nullptr;
5409 _inner_classes = nullptr;
5410 _nest_members = nullptr;
5411 _permitted_subclasses = nullptr;
5412 _combined_annotations = nullptr;
5413 _class_annotations = _class_type_annotations = nullptr;
5414 _fields_annotations = _fields_type_annotations = nullptr;
5415 _record_components = nullptr;
5416 }
5417
5418 // Destructor to clean up
5419 ClassFileParser::~ClassFileParser() {
5420 _class_name->decrement_refcount();
5421
5422 if (_cp != nullptr) {
5423 MetadataFactory::free_metadata(_loader_data, _cp);
5424 }
5425
5426 if (_fieldinfo_stream != nullptr) {
5427 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5428 }
5429 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5430
5431 if (_fields_status != nullptr) {
5432 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5433 }
5434
5435 if (_methods != nullptr) {
5436 // Free methods
5437 InstanceKlass::deallocate_methods(_loader_data, _methods);
5438 }
5439
5440 // beware of the Universe::empty_blah_array!!
5441 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5442 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5443 }
5444
5445 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5446 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5447 }
5448
5449 if (_record_components != nullptr) {
5450 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5451 }
5452
5453 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5454 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5455 }
5456
5457 // Free interfaces
5458 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5459 _local_interfaces, _transitive_interfaces);
5460
5461 if (_combined_annotations != nullptr) {
5462 // After all annotations arrays have been created, they are installed into the
5463 // Annotations object that will be assigned to the InstanceKlass being created.
5464
5465 // Deallocate the Annotations object and the installed annotations arrays.
5466 _combined_annotations->deallocate_contents(_loader_data);
5467
5468 // If the _combined_annotations pointer is non-null,
5469 // then the other annotations fields should have been cleared.
5470 assert(_class_annotations == nullptr, "Should have been cleared");
5471 assert(_class_type_annotations == nullptr, "Should have been cleared");
5472 assert(_fields_annotations == nullptr, "Should have been cleared");
5473 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5474 } else {
5475 // If the annotations arrays were not installed into the Annotations object,
5476 // 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
5858
5859 _klass_to_deallocate = klass;
5860 }
5861
5862 // Caller responsible for ResourceMark
5863 // clone stream with rewound position
5864 const ClassFileStream* ClassFileParser::clone_stream() const {
5865 assert(_stream != nullptr, "invariant");
5866
5867 return _stream->clone();
5868 }
5869
5870 ReferenceType ClassFileParser::super_reference_type() const {
|
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/bsmAttribute.inline.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/inlineKlass.inline.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/klassVtable.hpp"
60 #include "oops/metadata.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiThreadState.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/fieldDescriptor.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/safepointVerifiers.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/timer.hpp"
77 #include "services/classLoadingService.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/bitMap.inline.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/exceptions.hpp"
84 #include "utilities/formatBuffer.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/hashTable.hpp"
88 #include "utilities/macros.hpp"
89 #include "utilities/ostream.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95
96 // We generally try to create the oops directly when parsing, rather than
97 // allocating temporary data structures and copying the bytes twice. A
98 // temporary area is only needed when parsing utf8 entries in the constant
99 // pool and when parsing line number tables.
100
101 // We add assert in debug mode when class format is not checked.
102
103 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
104 #define JAVA_MIN_SUPPORTED_VERSION 45
105 #define JAVA_PREVIEW_MINOR_VERSION 65535
106
107 // Used for two backward compatibility reasons:
108 // - to check for new additions to the class file format in JDK1.5
109 // - to check for bug fixes in the format checker in JDK1.5
110 #define JAVA_1_5_VERSION 49
180 // this method that uses stream().
181 const ClassFileStream cfs1 = *stream;
182 const ClassFileStream* const cfs = &cfs1;
183
184 DEBUG_ONLY(const u1* const old_current = stream->current();)
185
186 // Used for batching symbol allocations.
187 const char* names[SymbolTable::symbol_alloc_batch_size];
188 int lengths[SymbolTable::symbol_alloc_batch_size];
189 int indices[SymbolTable::symbol_alloc_batch_size];
190 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
191 int names_count = 0;
192
193 // parsing Index 0 is unused
194 for (int index = 1; index < length; index++) {
195 // Each of the following case guarantees one more byte in the stream
196 // for the following tag or the access_flags following constant pool,
197 // so we don't need bounds-check for reading tag.
198 const u1 tag = cfs->get_u1_fast();
199 switch (tag) {
200 case JVM_CONSTANT_Class: {
201 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
202 const u2 name_index = cfs->get_u2_fast();
203 cp->klass_index_at_put(index, name_index);
204 break;
205 }
206 case JVM_CONSTANT_Fieldref: {
207 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
208 const u2 class_index = cfs->get_u2_fast();
209 const u2 name_and_type_index = cfs->get_u2_fast();
210 cp->field_at_put(index, class_index, name_and_type_index);
211 break;
212 }
213 case JVM_CONSTANT_Methodref: {
214 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
215 const u2 class_index = cfs->get_u2_fast();
216 const u2 name_and_type_index = cfs->get_u2_fast();
217 cp->method_at_put(index, class_index, name_and_type_index);
218 break;
219 }
220 case JVM_CONSTANT_InterfaceMethodref: {
484 guarantee_property(valid_symbol_at(name_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 name_ref_index, CHECK);
487 guarantee_property(valid_symbol_at(signature_ref_index),
488 "Invalid constant pool index %u in class file %s",
489 signature_ref_index, CHECK);
490 break;
491 }
492 case JVM_CONSTANT_Utf8:
493 break;
494 case JVM_CONSTANT_UnresolvedClass: // fall-through
495 case JVM_CONSTANT_UnresolvedClassInError: {
496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
497 break;
498 }
499 case JVM_CONSTANT_ClassIndex: {
500 const int class_index = cp->klass_index_at(index);
501 guarantee_property(valid_symbol_at(class_index),
502 "Invalid constant pool index %u in class file %s",
503 class_index, CHECK);
504
505 Symbol* const name = cp->symbol_at(class_index);
506 const unsigned int name_len = name->utf8_length();
507 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
508 break;
509 }
510 case JVM_CONSTANT_StringIndex: {
511 const int string_index = cp->string_index_at(index);
512 guarantee_property(valid_symbol_at(string_index),
513 "Invalid constant pool index %u in class file %s",
514 string_index, CHECK);
515 Symbol* const sym = cp->symbol_at(string_index);
516 cp->unresolved_string_at_put(index, sym);
517 break;
518 }
519 case JVM_CONSTANT_MethodHandle: {
520 const int ref_index = cp->method_handle_index_at(index);
521 guarantee_property(valid_cp_range(ref_index, length),
522 "Invalid constant pool index %u in class file %s",
523 ref_index, CHECK);
524 const constantTag tag = cp->tag_at(ref_index);
525 const int ref_kind = cp->method_handle_ref_kind_at(index);
526
696 }
697 }
698 } else {
699 if (_need_verify) {
700 // Method name and signature are individually verified above, when iterating
701 // NameAndType_info. Need to check here that signature is non-zero length and
702 // the right type.
703 if (!Signature::is_method(signature)) {
704 throwIllegalSignature("Method", name, signature, CHECK);
705 }
706 }
707 // If a class method name begins with '<', it must be "<init>" and have void signature.
708 const unsigned int name_len = name->utf8_length();
709 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
710 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
711 if (name != vmSymbols::object_initializer_name()) {
712 classfile_parse_error(
713 "Bad method name at constant pool index %u in class file %s",
714 name_ref_index, THREAD);
715 return;
716 } else if (!Signature::is_void_method(signature)) { // must have void signature.
717 throwIllegalSignature("Method", name, signature, CHECK);
718 }
719 }
720 }
721 break;
722 }
723 case JVM_CONSTANT_MethodHandle: {
724 const int ref_index = cp->method_handle_index_at(index);
725 const int ref_kind = cp->method_handle_ref_kind_at(index);
726 switch (ref_kind) {
727 case JVM_REF_invokeVirtual:
728 case JVM_REF_invokeStatic:
729 case JVM_REF_invokeSpecial:
730 case JVM_REF_newInvokeSpecial: {
731 const int name_and_type_ref_index =
732 cp->uncached_name_and_type_ref_index_at(ref_index);
733 const int name_ref_index =
734 cp->name_ref_index_at(name_and_type_ref_index);
735 const Symbol* const name = cp->symbol_at(name_ref_index);
736
737 if (name != vmSymbols::object_initializer_name()) { // !<init>
738 if (ref_kind == JVM_REF_newInvokeSpecial) {
739 classfile_parse_error(
740 "Bad constructor name at constant pool index %u in class file %s",
741 name_ref_index, THREAD);
742 return;
743 }
744 } else { // <init>
745 // The allowed invocation mode of <init> depends on its signature.
746 // This test corresponds to verify_invoke_instructions in the verifier.
747 const int signature_ref_index =
748 cp->signature_ref_index_at(name_and_type_ref_index);
749 const Symbol* const signature = cp->symbol_at(signature_ref_index);
750 if (signature->is_void_method_signature()
751 && ref_kind == JVM_REF_newInvokeSpecial) {
752 // OK, could be a constructor call
753 } else {
754 classfile_parse_error(
755 "Bad method name at constant pool index %u in class file %s",
756 name_ref_index, THREAD);
757 return;
758 }
759 }
760 break;
761 }
762 // Other ref_kinds are already fully checked in previous pass.
763 } // switch(ref_kind)
764 break;
765 }
766 case JVM_CONSTANT_MethodType: {
767 const Symbol* const no_name = vmSymbols::type_name(); // place holder
768 const Symbol* const signature = cp->method_type_signature_at(index);
769 verify_legal_method_signature(no_name, signature, CHECK);
770 break;
771 }
772 case JVM_CONSTANT_Utf8: {
773 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
785
786 NameSigHash(Symbol* name, Symbol* sig) :
787 _name(name),
788 _sig(sig) {}
789
790 static unsigned int hash(NameSigHash const& namesig) {
791 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
792 }
793
794 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
795 return (e0._name == e1._name) &&
796 (e0._sig == e1._sig);
797 }
798 };
799
800 using NameSigHashtable = HashTable<NameSigHash, int,
801 NameSigHash::HASH_ROW_SIZE,
802 AnyObj::RESOURCE_AREA, mtInternal,
803 &NameSigHash::hash, &NameSigHash::equals>;
804
805 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
806 assert(super_type != nullptr,"Method doesn't support null super type");
807 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
808 && super_type->name() != vmSymbols::java_lang_Object()) {
809 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
810 err_msg("Value type %s has an identity type as supertype",
811 current->class_name()->as_klass_external_name()));
812 }
813 }
814
815 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
816 int itfs_len,
817 ConstantPool* cp,
818 bool* const has_nonstatic_concrete_methods,
819 // FIXME: lots of these functions
820 // declare their parameters as const,
821 // which adds only noise to the code.
822 // Remove the spurious const modifiers.
823 // Many are of the form "const int x"
824 // or "T* const x".
825 TRAPS) {
826 assert(stream != nullptr, "invariant");
827 assert(cp != nullptr, "invariant");
828 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
829
830 if (itfs_len == 0) {
831 _local_interfaces = Universe::the_empty_instance_klass_array();
832
833 } else {
834 assert(itfs_len > 0, "only called for len>0");
835 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
836 int index = 0;
837 for (index = 0; index < itfs_len; index++) {
838 const u2 interface_index = stream->get_u2(CHECK);
839 guarantee_property(
840 valid_klass_reference_at(interface_index),
841 "Interface name has bad constant pool index %u in class file %s",
842 interface_index, CHECK);
843 _local_interface_indexes->at_put_grow(index, interface_index);
844 }
845
846 if (!_need_verify || itfs_len <= 1) {
847 return;
848 }
849
850 // Check if there's any duplicates in interfaces
851 ResourceMark rm(THREAD);
852 // Set containing interface names
853 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
854 for (index = 0; index < itfs_len; index++) {
855 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
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 _jdk_internal_LooselyConsistentValue,
943 _jdk_internal_NullRestricted,
944 _java_lang_Deprecated,
945 _java_lang_Deprecated_for_removal,
946 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
947 _method_AOTRuntimeSetup,
948 _jdk_internal_vm_annotation_TrustFinalFields,
949 _annotation_LIMIT
950 };
951 const Location _location;
952 int _annotations_present;
953 u2 _contended_group;
954
955 AnnotationCollector(Location location)
956 : _location(location), _annotations_present(0), _contended_group(0)
957 {
958 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
959 }
960 // If this annotation name has an ID, report it (or _none).
961 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
962 // Set the annotation name:
963 void set_annotation(ID id) {
1358 }
1359
1360 *constantvalue_index_addr = constantvalue_index;
1361 *is_synthetic_addr = is_synthetic;
1362 *generic_signature_index_addr = generic_signature_index;
1363 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1364 runtime_visible_annotations_length,
1365 CHECK);
1366 parsed_annotations->set_field_annotations(a);
1367 a = allocate_annotations(runtime_visible_type_annotations,
1368 runtime_visible_type_annotations_length,
1369 CHECK);
1370 parsed_annotations->set_field_type_annotations(a);
1371 return;
1372 }
1373
1374
1375 // Side-effects: populates the _fields, _fields_annotations,
1376 // _fields_type_annotations fields
1377 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1378 AccessFlags class_access_flags,
1379 ConstantPool* cp,
1380 const int cp_size,
1381 u2* const java_fields_count_ptr,
1382 TRAPS) {
1383
1384 assert(cfs != nullptr, "invariant");
1385 assert(cp != nullptr, "invariant");
1386 assert(java_fields_count_ptr != nullptr, "invariant");
1387
1388 assert(nullptr == _fields_annotations, "invariant");
1389 assert(nullptr == _fields_type_annotations, "invariant");
1390
1391 // "inline type" means concrete value class
1392 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1393 // "value class" can be either abstract or concrete value class
1394 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1395 cfs->guarantee_more(2, CHECK); // length
1396 const u2 length = cfs->get_u2_fast();
1397 *java_fields_count_ptr = length;
1398
1399 int num_injected = 0;
1400 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1401 &num_injected);
1402
1403 // Two more slots are required for inline classes:
1404 // - The static field ".null_reset" which carries the nullable flat layout
1405 // representation of null, added below
1406 // - The nonstatic field ".empty" the JVM injects when detecting an empty
1407 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout
1408 // One more slot is required for both abstract value class and inline classes:
1409 // - The static field ".acmp_maps" for acmp and identity hash, tracks
1410 // nonstatic fields both inherited or declared, added below
1411 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1412 + (is_value_class ? 1 : 0);
1413
1414 // Allocate a temporary resource array to collect field data.
1415 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1416 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1417
1418 ResourceMark rm(THREAD);
1419 for (int n = 0; n < length; n++) {
1420 // access_flags, name_index, descriptor_index, attributes_count
1421 cfs->guarantee_more(8, CHECK);
1422
1423 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1424 if (!supports_inline_types()) {
1425 recognized_modifiers &= ~JVM_ACC_STRICT_INIT;
1426 }
1427
1428 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1429 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1430 AccessFlags access_flags;
1431 access_flags.set_flags(flags);
1432 FieldInfo::FieldFlags fieldFlags(0);
1433
1434 const u2 name_index = cfs->get_u2_fast();
1435 guarantee_property(valid_symbol_at(name_index),
1436 "Invalid constant pool index %u for field name in class file %s",
1437 name_index, CHECK);
1438 const Symbol* const name = cp->symbol_at(name_index);
1439 verify_legal_field_name(name, CHECK);
1440
1441 const u2 signature_index = cfs->get_u2_fast();
1442 guarantee_property(valid_symbol_at(signature_index),
1443 "Invalid constant pool index %u for field signature in class file %s",
1444 signature_index, CHECK);
1445 const Symbol* const sig = cp->symbol_at(signature_index);
1446 verify_legal_field_signature(name, sig, CHECK);
1447
1448 u2 constantvalue_index = 0;
1449 bool is_synthetic = false;
1450 u2 generic_signature_index = 0;
1451 const bool is_static = access_flags.is_static();
1452 FieldAnnotationCollector parsed_annotations(_loader_data);
1453
1454 bool is_null_restricted = false;
1455
1456 const u2 attributes_count = cfs->get_u2_fast();
1457 if (attributes_count > 0) {
1458 parse_field_attributes(cfs,
1459 attributes_count,
1460 is_static,
1461 signature_index,
1462 &constantvalue_index,
1463 &is_synthetic,
1464 &generic_signature_index,
1465 &parsed_annotations,
1466 CHECK);
1467
1468 if (parsed_annotations.field_annotations() != nullptr) {
1469 if (_fields_annotations == nullptr) {
1470 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1471 _loader_data, length, nullptr,
1472 CHECK);
1473 }
1474 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1475 parsed_annotations.set_field_annotations(nullptr);
1476 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1477 if (!Signature::has_envelope(sig)) {
1478 Exceptions::fthrow(
1479 THREAD_AND_LOCATION,
1480 vmSymbols::java_lang_ClassFormatError(),
1481 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1482 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1483 return;
1484 }
1485 if (!supports_inline_types()) {
1486 Exceptions::fthrow(
1487 THREAD_AND_LOCATION,
1488 vmSymbols::java_lang_ClassFormatError(),
1489 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file",
1490 class_name()->as_C_string(), name->as_C_string());
1491 return;
1492 }
1493
1494 if ((flags & JVM_ACC_STRICT_INIT) == 0) {
1495 // Inject STRICT_INIT and validate in context
1496 const jint patched_flags = flags | JVM_ACC_STRICT_INIT;
1497 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK);
1498 access_flags.set_flags(patched_flags);
1499 }
1500 is_null_restricted = true;
1501 }
1502 parsed_annotations.set_field_annotations(nullptr);
1503 }
1504 if (parsed_annotations.field_type_annotations() != nullptr) {
1505 if (_fields_type_annotations == nullptr) {
1506 _fields_type_annotations =
1507 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1508 length,
1509 nullptr,
1510 CHECK);
1511 }
1512 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1513 parsed_annotations.set_field_type_annotations(nullptr);
1514 }
1515
1516 if (is_synthetic) {
1517 access_flags.set_is_synthetic();
1518 }
1519 if (generic_signature_index != 0) {
1520 fieldFlags.update_generic(true);
1521 }
1522 }
1523
1524 if (is_null_restricted) {
1525 fieldFlags.update_null_free_inline_type(true);
1526 }
1527
1528 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1529
1530 // Update number of static oop fields.
1531 if (is_static && is_reference_type(type)) {
1532 _static_oop_count++;
1533 }
1534
1535 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1536 fi.set_index(n);
1537 if (fieldFlags.is_generic()) {
1538 fi.set_generic_signature_index(generic_signature_index);
1539 }
1540 parsed_annotations.apply_to(&fi);
1541 if (fi.field_flags().is_contended()) {
1542 _has_contended_fields = true;
1543 }
1544 if (access_flags.is_strict() && access_flags.is_static()) {
1545 _has_strict_static_fields = true;
1546 }
1547 _temp_field_info->append(fi);
1548 }
1549 assert(_temp_field_info->length() == length, "Must be");
1550
1551 if (num_injected != 0) {
1552 for (int n = 0; n < num_injected; n++) {
1553 // Check for duplicates
1554 if (injected[n].may_be_java) {
1555 const Symbol* const name = injected[n].name();
1556 const Symbol* const signature = injected[n].signature();
1557 bool duplicate = false;
1558 for (int i = 0; i < length; i++) {
1559 const FieldInfo* const f = _temp_field_info->adr_at(i);
1560 if (name == cp->symbol_at(f->name_index()) &&
1561 signature == cp->symbol_at(f->signature_index())) {
1562 // Symbol is desclared in Java so skip this one
1563 duplicate = true;
1564 break;
1565 }
1566 }
1567 if (duplicate) {
1568 // These will be removed from the field array at the end
1569 continue;
1570 }
1571 }
1572
1573 // Injected field
1574 FieldInfo::FieldFlags fflags(0);
1575 fflags.update_injected(true);
1576 AccessFlags aflags;
1577 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1578 int idx = _temp_field_info->append(fi);
1579 _temp_field_info->adr_at(idx)->set_index(idx);
1580 }
1581 }
1582
1583 if (is_inline_type) {
1584 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1585 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1586 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1587 // alive.
1588 FieldInfo::FieldFlags fflags2(0);
1589 fflags2.update_injected(true);
1590 AccessFlags aflags2(JVM_ACC_STATIC);
1591 FieldInfo fi2(aflags2,
1592 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1593 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1594 0,
1595 fflags2);
1596 int idx2 = _temp_field_info->append(fi2);
1597 _temp_field_info->adr_at(idx2)->set_index(idx2);
1598 _static_oop_count++;
1599 }
1600 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1601 && _class_name != vmSymbols::java_lang_Object()) {
1602 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1603 FieldInfo::FieldFlags fflags2(0);
1604 fflags2.update_injected(true);
1605 fflags2.update_stable(true);
1606 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1607 FieldInfo fi3(aflags2,
1608 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1609 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1610 0,
1611 fflags2);
1612 int idx2 = _temp_field_info->append(fi3);
1613 _temp_field_info->adr_at(idx2)->set_index(idx2);
1614 _static_oop_count++;
1615 }
1616
1617 if (_need_verify && length > 1) {
1618 // Check duplicated fields
1619 ResourceMark rm(THREAD);
1620 // Set containing name-signature pairs
1621 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1622 for (int i = 0; i < _temp_field_info->length(); i++) {
1623 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1624 _temp_field_info->adr_at(i)->signature(_cp));
1625 // If no duplicates, add name/signature in hashtable names_and_sigs.
1626 if(!names_and_sigs->put(name_and_sig, 0)) {
1627 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1628 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1629 return;
1630 }
1631 }
1632 }
1633 }
1634
1635
1980 }
1981 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1982 if (_location != _in_field && _location != _in_class) {
1983 break; // only allow for fields and classes
1984 }
1985 if (!EnableContended || (RestrictContended && !privileged)) {
1986 break; // honor privileges
1987 }
1988 return _jdk_internal_vm_annotation_Contended;
1989 }
1990 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1991 if (_location != _in_method) break; // only allow for methods
1992 if (RestrictReservedStack && !privileged) break; // honor privileges
1993 return _jdk_internal_vm_annotation_ReservedStackAccess;
1994 }
1995 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1996 if (_location != _in_class) break; // only allow for classes
1997 if (!privileged) break; // only allow in privileged code
1998 return _jdk_internal_ValueBased;
1999 }
2000 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2001 if (_location != _in_class) break; // only allow for classes
2002 return _jdk_internal_LooselyConsistentValue;
2003 }
2004 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2005 if (_location != _in_field) break; // only allow for fields
2006 return _jdk_internal_NullRestricted;
2007 }
2008 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2009 return _java_lang_Deprecated;
2010 }
2011 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2012 if (_location != _in_class) break; // only allow for classes
2013 if (!privileged) break; // only allow in privileged code
2014 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2015 }
2016 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2017 if (_location != _in_method) break; // only allow for methods
2018 if (!privileged) break; // only allow in privileged code
2019 return _method_AOTRuntimeSetup;
2020 }
2021 default: {
2022 break;
2023 }
2024 }
2025 return AnnotationCollector::_unknown;
2026 }
2027
2227 }
2228
2229 if (runtime_visible_type_annotations_length > 0) {
2230 a = allocate_annotations(runtime_visible_type_annotations,
2231 runtime_visible_type_annotations_length,
2232 CHECK);
2233 cm->set_type_annotations(a);
2234 }
2235 }
2236
2237
2238 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2239 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2240 // Method* to save footprint, so we only know the size of the resulting Method* when the
2241 // entire method attribute is parsed.
2242 //
2243 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2244
2245 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2246 bool is_interface,
2247 bool is_value_class,
2248 bool is_abstract_class,
2249 const ConstantPool* cp,
2250 bool* const has_localvariable_table,
2251 TRAPS) {
2252 assert(cfs != nullptr, "invariant");
2253 assert(cp != nullptr, "invariant");
2254 assert(has_localvariable_table != nullptr, "invariant");
2255
2256 ResourceMark rm(THREAD);
2257 // Parse fixed parts:
2258 // access_flags, name_index, descriptor_index, attributes_count
2259 cfs->guarantee_more(8, CHECK_NULL);
2260
2261 u2 flags = cfs->get_u2_fast();
2262 const u2 name_index = cfs->get_u2_fast();
2263 const int cp_size = cp->length();
2264 guarantee_property(
2265 valid_symbol_at(name_index),
2266 "Illegal constant pool index %u for method name in class file %s",
2267 name_index, CHECK_NULL);
2268 const Symbol* const name = cp->symbol_at(name_index);
2270
2271 const u2 signature_index = cfs->get_u2_fast();
2272 guarantee_property(
2273 valid_symbol_at(signature_index),
2274 "Illegal constant pool index %u for method signature in class file %s",
2275 signature_index, CHECK_NULL);
2276 const Symbol* const signature = cp->symbol_at(signature_index);
2277
2278 if (name == vmSymbols::class_initializer_name()) {
2279 // We ignore the other access flags for a valid class initializer.
2280 // (JVM Spec 2nd ed., chapter 4.6)
2281 if (_major_version < 51) { // backward compatibility
2282 flags = JVM_ACC_STATIC;
2283 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2284 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2285 } else {
2286 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2287 return nullptr;
2288 }
2289 } else {
2290 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2291 }
2292
2293 if (name == vmSymbols::object_initializer_name() && is_interface) {
2294 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2295 return nullptr;
2296 }
2297
2298 if (Arguments::is_valhalla_enabled()) {
2299 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2300 && ((flags & JVM_ACC_STATIC) == 0 )
2301 && !_access_flags.is_identity_class()) {
2302 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2303 return nullptr;
2304 }
2305 }
2306
2307 int args_size = -1; // only used when _need_verify is true
2308 if (_need_verify) {
2309 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2310 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2311 verify_legal_method_signature(name, signature, CHECK_NULL);
2312 if (args_size > MAX_ARGS_SIZE) {
2313 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2314 return nullptr;
2315 }
2316 }
2317
2318 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2319
2320 // Default values for code and exceptions attribute elements
2321 u2 max_stack = 0;
2322 u2 max_locals = 0;
2323 u4 code_length = 0;
2324 const u1* code_start = nullptr;
2325 u2 exception_table_length = 0;
2326 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2821 CHECK_NULL);
2822
2823 if (InstanceKlass::is_finalization_enabled() &&
2824 name == vmSymbols::finalize_method_name() &&
2825 signature == vmSymbols::void_method_signature()) {
2826 if (m->is_empty_method()) {
2827 _has_empty_finalizer = true;
2828 } else {
2829 _has_finalizer = true;
2830 }
2831 }
2832
2833 NOT_PRODUCT(m->verify());
2834 return m;
2835 }
2836
2837
2838 // Side-effects: populates the _methods field in the parser
2839 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2840 bool is_interface,
2841 bool is_value_class,
2842 bool is_abstract_type,
2843 bool* const has_localvariable_table,
2844 bool* has_final_method,
2845 bool* declares_nonstatic_concrete_methods,
2846 TRAPS) {
2847 assert(cfs != nullptr, "invariant");
2848 assert(has_localvariable_table != nullptr, "invariant");
2849 assert(has_final_method != nullptr, "invariant");
2850 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2851
2852 assert(nullptr == _methods, "invariant");
2853
2854 cfs->guarantee_more(2, CHECK); // length
2855 const u2 length = cfs->get_u2_fast();
2856 if (length == 0) {
2857 _methods = Universe::the_empty_method_array();
2858 } else {
2859 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2860 length,
2861 nullptr,
2862 CHECK);
2863
2864 for (int index = 0; index < length; index++) {
2865 Method* method = parse_method(cfs,
2866 is_interface,
2867 is_value_class,
2868 is_abstract_type,
2869 _cp,
2870 has_localvariable_table,
2871 CHECK);
2872
2873 if (method->is_final()) {
2874 *has_final_method = true;
2875 }
2876 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2877 // used for interface initialization, and default method inheritance analysis
2878 if (is_interface && !(*declares_nonstatic_concrete_methods)
2879 && !method->is_abstract() && !method->is_static()) {
2880 *declares_nonstatic_concrete_methods = true;
2881 }
2882 _methods->at_put(index, method);
2883 }
2884
2885 if (_need_verify && length > 1) {
2886 // Check duplicated methods
2887 ResourceMark rm(THREAD);
2888 // Set containing name-signature pairs
3114 valid_klass_reference_at(outer_class_info_index),
3115 "outer_class_info_index %u has bad constant type in class file %s",
3116 outer_class_info_index, CHECK_0);
3117
3118 if (outer_class_info_index != 0) {
3119 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3120 char* bytes = (char*)outer_class_name->bytes();
3121 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3122 "Outer class is an array class in class file %s", CHECK_0);
3123 }
3124 // Inner class name
3125 const u2 inner_name_index = cfs->get_u2_fast();
3126 guarantee_property(
3127 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3128 "inner_name_index %u has bad constant type in class file %s",
3129 inner_name_index, CHECK_0);
3130 if (_need_verify) {
3131 guarantee_property(inner_class_info_index != outer_class_info_index,
3132 "Class is both outer and inner class in class file %s", CHECK_0);
3133 }
3134
3135 // Access flags
3136 u2 flags;
3137 // JVM_ACC_MODULE is defined in JDK-9 and later.
3138 if (_major_version >= JAVA_9_VERSION) {
3139 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3140 } else {
3141 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3142 }
3143
3144 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3145 // Set abstract bit for old class files for backward compatibility
3146 flags |= JVM_ACC_ABSTRACT;
3147 }
3148
3149 if (!supports_inline_types()) {
3150 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3151 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3152 if (!is_module && !is_interface) {
3153 flags |= JVM_ACC_IDENTITY;
3154 }
3155 }
3156
3157 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3158 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3159 AccessFlags inner_access_flags(flags);
3160
3161 inner_classes->at_put(index++, inner_class_info_index);
3162 inner_classes->at_put(index++, outer_class_info_index);
3163 inner_classes->at_put(index++, inner_name_index);
3164 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3165 }
3166
3167 // Check for circular and duplicate entries.
3168 bool has_circularity = false;
3169 if (_need_verify) {
3170 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3171 if (has_circularity) {
3172 // If circularity check failed then ignore InnerClasses attribute.
3173 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3174 index = 0;
3175 if (parsed_enclosingmethod_attribute) {
3176 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3242 if (length > 0) {
3243 int index = 0;
3244 cfs->guarantee_more(2 * length, CHECK_0);
3245 for (int n = 0; n < length; n++) {
3246 const u2 class_info_index = cfs->get_u2_fast();
3247 guarantee_property(
3248 valid_klass_reference_at(class_info_index),
3249 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3250 class_info_index, CHECK_0);
3251 permitted_subclasses->at_put(index++, class_info_index);
3252 }
3253 assert(index == size, "wrong size");
3254 }
3255
3256 // Restore buffer's current position.
3257 cfs->set_current(current_mark);
3258
3259 return length;
3260 }
3261
3262 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3263 const u1* const loadable_descriptors_attribute_start,
3264 TRAPS) {
3265 const u1* const current_mark = cfs->current();
3266 u2 length = 0;
3267 if (loadable_descriptors_attribute_start != nullptr) {
3268 cfs->set_current(loadable_descriptors_attribute_start);
3269 cfs->guarantee_more(2, CHECK_0); // length
3270 length = cfs->get_u2_fast();
3271 }
3272 const int size = length;
3273 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3274 _loadable_descriptors = loadable_descriptors;
3275 if (length > 0) {
3276 int index = 0;
3277 cfs->guarantee_more(2 * length, CHECK_0);
3278 for (int n = 0; n < length; n++) {
3279 const u2 descriptor_index = cfs->get_u2_fast();
3280 guarantee_property(
3281 valid_symbol_at(descriptor_index),
3282 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3283 descriptor_index, CHECK_0);
3284 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3285 bool valid = legal_field_signature(descriptor, CHECK_0);
3286 if(!valid) {
3287 ResourceMark rm(THREAD);
3288 Exceptions::fthrow(THREAD_AND_LOCATION,
3289 vmSymbols::java_lang_ClassFormatError(),
3290 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3291 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3292 return 0;
3293 }
3294 loadable_descriptors->at_put(index++, descriptor_index);
3295 }
3296 assert(index == size, "wrong size");
3297 }
3298
3299 // Restore buffer's current position.
3300 cfs->set_current(current_mark);
3301
3302 return length;
3303 }
3304
3305 // Record {
3306 // u2 attribute_name_index;
3307 // u4 attribute_length;
3308 // u2 components_count;
3309 // component_info components[components_count];
3310 // }
3311 // component_info {
3312 // u2 name_index;
3313 // u2 descriptor_index
3314 // u2 attributes_count;
3315 // attribute_info_attributes[attributes_count];
3316 // }
3317 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3318 const ConstantPool* cp,
3319 const u1* const record_attribute_start,
3320 TRAPS) {
3321 const u1* const current_mark = cfs->current();
3322 int components_count = 0;
3323 unsigned int calculate_attr_size = 0;
3324 if (record_attribute_start != nullptr) {
3535 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3536 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3537 "Bad length on BootstrapMethods in class file %s",
3538 CHECK);
3539 }
3540
3541 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3542 ConstantPool* cp,
3543 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3544 TRAPS) {
3545 assert(cfs != nullptr, "invariant");
3546 assert(cp != nullptr, "invariant");
3547 assert(parsed_annotations != nullptr, "invariant");
3548
3549 // Set inner classes attribute to default sentinel
3550 _inner_classes = Universe::the_empty_short_array();
3551 // Set nest members attribute to default sentinel
3552 _nest_members = Universe::the_empty_short_array();
3553 // Set _permitted_subclasses attribute to default sentinel
3554 _permitted_subclasses = Universe::the_empty_short_array();
3555 // Set _loadable_descriptors attribute to default sentinel
3556 _loadable_descriptors = Universe::the_empty_short_array();
3557 cfs->guarantee_more(2, CHECK); // attributes_count
3558 u2 attributes_count = cfs->get_u2_fast();
3559 bool parsed_sourcefile_attribute = false;
3560 bool parsed_innerclasses_attribute = false;
3561 bool parsed_nest_members_attribute = false;
3562 bool parsed_permitted_subclasses_attribute = false;
3563 bool parsed_loadable_descriptors_attribute = false;
3564 bool parsed_nest_host_attribute = false;
3565 bool parsed_record_attribute = false;
3566 bool parsed_enclosingmethod_attribute = false;
3567 bool parsed_bootstrap_methods_attribute = false;
3568 const u1* runtime_visible_annotations = nullptr;
3569 int runtime_visible_annotations_length = 0;
3570 const u1* runtime_visible_type_annotations = nullptr;
3571 int runtime_visible_type_annotations_length = 0;
3572 bool runtime_invisible_type_annotations_exists = false;
3573 bool runtime_invisible_annotations_exists = false;
3574 bool parsed_source_debug_ext_annotations_exist = false;
3575 const u1* inner_classes_attribute_start = nullptr;
3576 u4 inner_classes_attribute_length = 0;
3577 u2 enclosing_method_class_index = 0;
3578 u2 enclosing_method_method_index = 0;
3579 const u1* nest_members_attribute_start = nullptr;
3580 u4 nest_members_attribute_length = 0;
3581 const u1* record_attribute_start = nullptr;
3582 u4 record_attribute_length = 0;
3583 const u1* permitted_subclasses_attribute_start = nullptr;
3584 u4 permitted_subclasses_attribute_length = 0;
3585 const u1* loadable_descriptors_attribute_start = nullptr;
3586 u4 loadable_descriptors_attribute_length = 0;
3587
3588 // Iterate over attributes
3589 while (attributes_count--) {
3590 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3591 const u2 attribute_name_index = cfs->get_u2_fast();
3592 const u4 attribute_length = cfs->get_u4_fast();
3593 guarantee_property(
3594 valid_symbol_at(attribute_name_index),
3595 "Attribute name has bad constant pool index %u in class file %s",
3596 attribute_name_index, CHECK);
3597 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3598 if (tag == vmSymbols::tag_source_file()) {
3599 // Check for SourceFile tag
3600 if (_need_verify) {
3601 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3602 }
3603 if (parsed_sourcefile_attribute) {
3604 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3605 return;
3606 } else {
3782 return;
3783 }
3784 parsed_record_attribute = true;
3785 record_attribute_start = cfs->current();
3786 record_attribute_length = attribute_length;
3787 } else if (_major_version >= JAVA_17_VERSION) {
3788 if (tag == vmSymbols::tag_permitted_subclasses()) {
3789 if (parsed_permitted_subclasses_attribute) {
3790 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3791 return;
3792 }
3793 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3794 if (_access_flags.is_final()) {
3795 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3796 return;
3797 }
3798 parsed_permitted_subclasses_attribute = true;
3799 permitted_subclasses_attribute_start = cfs->current();
3800 permitted_subclasses_attribute_length = attribute_length;
3801 }
3802 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3803 if (parsed_loadable_descriptors_attribute) {
3804 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3805 return;
3806 }
3807 parsed_loadable_descriptors_attribute = true;
3808 loadable_descriptors_attribute_start = cfs->current();
3809 loadable_descriptors_attribute_length = attribute_length;
3810 }
3811 }
3812 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3813 cfs->skip_u1(attribute_length, CHECK);
3814 } else {
3815 // Unknown attribute
3816 cfs->skip_u1(attribute_length, CHECK);
3817 }
3818 } else {
3819 // Unknown attribute
3820 cfs->skip_u1(attribute_length, CHECK);
3821 }
3822 } else {
3823 // Unknown attribute
3824 cfs->skip_u1(attribute_length, CHECK);
3825 }
3826 }
3827 _class_annotations = allocate_annotations(runtime_visible_annotations,
3828 runtime_visible_annotations_length,
3829 CHECK);
3830 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3867 CHECK);
3868 if (_need_verify) {
3869 guarantee_property(record_attribute_length == calculated_attr_length,
3870 "Record attribute has wrong length in class file %s",
3871 CHECK);
3872 }
3873 }
3874
3875 if (parsed_permitted_subclasses_attribute) {
3876 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3877 cfs,
3878 permitted_subclasses_attribute_start,
3879 CHECK);
3880 if (_need_verify) {
3881 guarantee_property(
3882 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3883 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3884 }
3885 }
3886
3887 if (parsed_loadable_descriptors_attribute) {
3888 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3889 cfs,
3890 loadable_descriptors_attribute_start,
3891 CHECK);
3892 if (_need_verify) {
3893 guarantee_property(
3894 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3895 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3896 }
3897 }
3898
3899 if (_max_bootstrap_specifier_index >= 0) {
3900 guarantee_property(parsed_bootstrap_methods_attribute,
3901 "Missing BootstrapMethods attribute in class file %s", CHECK);
3902 }
3903 }
3904
3905 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3906 assert(k != nullptr, "invariant");
3907
3908 if (_synthetic_flag)
3909 k->set_is_synthetic();
3910 if (_sourcefile_index != 0) {
3911 k->set_source_file_name_index(_sourcefile_index);
3912 }
3913 if (_generic_signature_index != 0) {
3914 k->set_generic_signature_index(_generic_signature_index);
3915 }
3916 if (_sde_buffer != nullptr) {
3917 k->set_source_debug_extension(_sde_buffer, _sde_length);
3918 }
3945 _class_type_annotations = nullptr;
3946 _fields_annotations = nullptr;
3947 _fields_type_annotations = nullptr;
3948 }
3949
3950 // Transfer ownership of metadata allocated to the InstanceKlass.
3951 void ClassFileParser::apply_parsed_class_metadata(
3952 InstanceKlass* this_klass,
3953 int java_fields_count) {
3954 assert(this_klass != nullptr, "invariant");
3955
3956 _cp->set_pool_holder(this_klass);
3957 this_klass->set_constants(_cp);
3958 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3959 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3960 this_klass->set_fields_status(_fields_status);
3961 this_klass->set_methods(_methods);
3962 this_klass->set_inner_classes(_inner_classes);
3963 this_klass->set_nest_members(_nest_members);
3964 this_klass->set_nest_host_index(_nest_host);
3965 this_klass->set_loadable_descriptors(_loadable_descriptors);
3966 this_klass->set_annotations(_combined_annotations);
3967 this_klass->set_permitted_subclasses(_permitted_subclasses);
3968 this_klass->set_record_components(_record_components);
3969 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3970
3971 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3972
3973 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3974 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3975 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3976 // its _super. If an OOM occurs while loading the current klass, its _super field
3977 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3978 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3979 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3980
3981 // Clear out these fields so they don't get deallocated by the destructor
3982 clear_class_metadata();
3983 }
3984
3985 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3986 int anno_length,
3987 TRAPS) {
3988 AnnotationArray* annotations = nullptr;
3989 if (anno != nullptr) {
3990 annotations = MetadataFactory::new_array<u1>(_loader_data,
3991 anno_length,
3992 CHECK_(annotations));
3993 for (int i = 0; i < anno_length; i++) {
3994 annotations->at_put(i, anno[i]);
3995 }
3996 }
3997 return annotations;
3998 }
3999
4000 void ClassFileParser::check_super_class(ConstantPool* const cp,
4001 const int super_class_index,
4002 const bool need_verify,
4003 TRAPS) {
4004 assert(cp != nullptr, "invariant");
4005
4006 if (super_class_index == 0) {
4007 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
4008 "Invalid superclass index 0 in class file %s",
4009 CHECK);
4010 } else {
4011 guarantee_property(valid_klass_reference_at(super_class_index),
4012 "Invalid superclass index %u in class file %s",
4013 super_class_index,
4014 CHECK);
4015
4016 // The class name should be legal because it is checked when parsing constant pool.
4017 // However, make sure it is not an array type.
4018 if (need_verify) {
4019 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4020 "Bad superclass name in class file %s", CHECK);
4021 }
4022 }
4023 }
4024
4025 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4026 _max_nonstatic_oop_maps = max_blocks;
4027 _nonstatic_oop_map_count = 0;
4028 if (max_blocks == 0) {
4180 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4181 assert(ik->size_helper() > 0, "layout_helper is initialized");
4182 if (ik->is_abstract() || ik->is_interface()
4183 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4184 || ik->size_helper() >= FastAllocateSizeLimit) {
4185 // Forbid fast-path allocation.
4186 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4187 ik->set_layout_helper(lh);
4188 }
4189
4190 // Propagate the AOT runtimeSetup method discovery
4191 if (_has_aot_runtime_setup_method) {
4192 ik->set_is_runtime_setup_required();
4193 if (log_is_enabled(Info, aot, init)) {
4194 ResourceMark rm;
4195 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4196 }
4197 }
4198 }
4199
4200 bool ClassFileParser::supports_inline_types() const {
4201 // Inline types are only supported by class file version 71.65535 and later
4202 return _major_version > JAVA_27_VERSION ||
4203 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4204 }
4205
4206 // utility methods for appending an array with check for duplicates
4207
4208 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4209 const Array<InstanceKlass*>* const ifs) {
4210 // iterate over new interfaces
4211 for (int i = 0; i < ifs->length(); i++) {
4212 InstanceKlass* const e = ifs->at(i);
4213 assert(e->is_klass() && e->is_interface(), "just checking");
4214 // add new interface
4215 result->append_if_missing(e);
4216 }
4217 }
4218
4219 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4220 Array<InstanceKlass*>* local_ifs,
4221 ClassLoaderData* loader_data,
4222 TRAPS) {
4223 assert(local_ifs != nullptr, "invariant");
4224 assert(loader_data != nullptr, "invariant");
4225
4229 // Add superclass transitive interfaces size
4230 if (super != nullptr) {
4231 super_size = super->transitive_interfaces()->length();
4232 max_transitive_size += super_size;
4233 }
4234 // Add local interfaces' super interfaces
4235 const int local_size = local_ifs->length();
4236 for (int i = 0; i < local_size; i++) {
4237 InstanceKlass* const l = local_ifs->at(i);
4238 max_transitive_size += l->transitive_interfaces()->length();
4239 }
4240 // Finally add local interfaces
4241 max_transitive_size += local_size;
4242 // Construct array
4243 if (max_transitive_size == 0) {
4244 // no interfaces, use canonicalized array
4245 return Universe::the_empty_instance_klass_array();
4246 } else if (max_transitive_size == super_size) {
4247 // no new local interfaces added, share superklass' transitive interface array
4248 return super->transitive_interfaces();
4249 // The three lines below are commented to work around bug JDK-8245487
4250 // } else if (max_transitive_size == local_size) {
4251 // // only local interfaces added, share local interface array
4252 // return local_ifs;
4253 } else {
4254 ResourceMark rm;
4255 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4256
4257 // Copy down from superclass
4258 if (super != nullptr) {
4259 append_interfaces(result, super->transitive_interfaces());
4260 }
4261
4262 // Copy down from local interfaces' superinterfaces
4263 for (int i = 0; i < local_size; i++) {
4264 InstanceKlass* const l = local_ifs->at(i);
4265 append_interfaces(result, l->transitive_interfaces());
4266 }
4267 // Finally add local interfaces
4268 append_interfaces(result, local_ifs);
4269
4270 // length will be less than the max_transitive_size if duplicates were removed
4271 const int length = result->length();
4272 assert(length <= max_transitive_size, "just checking");
4273
4274 Array<InstanceKlass*>* const new_result =
4275 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4276 for (int i = 0; i < length; i++) {
4277 InstanceKlass* const e = result->at(i);
4278 assert(e != nullptr, "just checking");
4279 new_result->at_put(i, e);
4280 }
4281 return new_result;
4282 }
4283 }
4284
4285 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4286 assert(this_klass != nullptr, "invariant");
4287 const InstanceKlass* const super = this_klass->super();
4288
4289 if (super != nullptr) {
4290 if (super->is_final()) {
4291 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4292 return;
4293 }
4294
4295 if (super->is_sealed()) {
4296 stringStream ss;
4297 ResourceMark rm(THREAD);
4298 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4299 classfile_icce_error(ss.as_string(), THREAD);
4300 return;
4301 }
4302 }
4303
4304 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4305 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4306 // for a value classes. So, it is treated as a special case for now.
4307 if (!this_klass->access_flags().is_identity_class() &&
4308 super->name() != vmSymbols::java_lang_Object() &&
4309 super->is_identity_class()) {
4310 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4311 return;
4312 }
4313
4314 Reflection::VerifyClassAccessResults vca_result =
4315 Reflection::verify_class_access(this_klass, super, false);
4316 if (vca_result != Reflection::ACCESS_OK) {
4317 ResourceMark rm(THREAD);
4318 char* msg = Reflection::verify_class_access_msg(this_klass,
4319 super,
4320 vca_result);
4321
4322 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4323 if (msg == nullptr) {
4324 bool same_module = (this_klass->module() == super->module());
4325 Exceptions::fthrow(
4326 THREAD_AND_LOCATION,
4327 vmSymbols::java_lang_IllegalAccessError(),
4328 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4329 this_klass->external_name(),
4330 super->is_abstract() ? "abstract " : "",
4331 super->external_name(),
4332 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4333 (same_module) ? "" : "; ",
4486 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4487 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4488 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4489 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4490 if (is_module) {
4491 ResourceMark rm(THREAD);
4492 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4493 Exceptions::fthrow(
4494 THREAD_AND_LOCATION,
4495 vmSymbols::java_lang_NoClassDefFoundError(),
4496 "%s is not a class because access_flag ACC_MODULE is set",
4497 _class_name->as_C_string());
4498 return;
4499 }
4500
4501 if (!_need_verify) { return; }
4502
4503 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4504 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4505 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4506 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4507 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4508 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4509 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4510 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final));
4511
4512 if ((is_abstract && is_final) ||
4513 (is_interface && !is_abstract) ||
4514 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4515 (!is_interface && major_gte_1_5 && is_annotation) ||
4516 (!valid_value_class)) {
4517 ResourceMark rm(THREAD);
4518 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4519 if (inner_name == nullptr && !is_anonymous_inner_class) {
4520 Exceptions::fthrow(
4521 THREAD_AND_LOCATION,
4522 vmSymbols::java_lang_ClassFormatError(),
4523 "Illegal class modifiers in class %s: 0x%X",
4524 _class_name->as_C_string(), flags
4525 );
4526 } else {
4527 if (is_anonymous_inner_class) {
4528 Exceptions::fthrow(
4529 THREAD_AND_LOCATION,
4530 vmSymbols::java_lang_ClassFormatError(),
4531 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4532 _class_name->as_C_string(), flags
4533 );
4534 } else {
4535 Exceptions::fthrow(
4536 THREAD_AND_LOCATION,
4591 THREAD_AND_LOCATION,
4592 vmSymbols::java_lang_UnsupportedClassVersionError(),
4593 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4594 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4595 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4596 return;
4597 }
4598
4599 if (!Arguments::enable_preview()) {
4600 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4601 class_name, major, minor, THREAD);
4602 return;
4603 }
4604
4605 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4606 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4607 class_name, major, minor, THREAD);
4608 }
4609 }
4610
4611 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4612 AccessFlags class_access_flags,
4613 TRAPS) const {
4614 if (!_need_verify) { return; }
4615
4616 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4617 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4618 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4619 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4620 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4621 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4622 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4623 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4624 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4625 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4626
4627 const bool is_interface = class_access_flags.is_interface();
4628 const bool is_identity_class = class_access_flags.is_identity_class();
4629
4630 bool is_illegal = false;
4631 const char* error_msg = "";
4632
4633 // There is some overlap in the checks that apply, for example interface fields
4634 // must be static, static fields can't be strict, and therefore interfaces can't
4635 // have strict fields. So we don't have to check every possible invalid combination
4636 // individually as long as all are covered. Once we have found an illegal combination
4637 // we can stop checking.
4638
4639 if (!is_illegal) {
4640 if (is_interface) {
4641 if (!is_public || !is_static || !is_final || is_private ||
4642 is_protected || is_volatile || is_transient ||
4643 (major_gte_1_5 && is_enum)) {
4644 is_illegal = true;
4645 error_msg = "interface fields must be public, static and final, and may be synthetic";
4646 }
4647 } else { // not interface
4648 if (has_illegal_visibility(flags)) {
4649 is_illegal = true;
4650 error_msg = "invalid visibility flags for class field";
4651 } else if (is_final && is_volatile) {
4652 is_illegal = true;
4653 error_msg = "fields cannot be final and volatile";
4654 } else if (supports_inline_types()) {
4655 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4656 is_illegal = true;
4657 error_msg = "value class fields must be either non-static final and strict, or static";
4658 }
4659 }
4660 }
4661 }
4662
4663 if (is_illegal) {
4664 ResourceMark rm(THREAD);
4665 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4666 Exceptions::fthrow(
4667 THREAD_AND_LOCATION,
4668 vmSymbols::java_lang_ClassFormatError(),
4669 "Illegal field modifiers (%s) in class %s: 0x%X",
4670 error_msg, _class_name->as_C_string(), flags);
4671 return;
4672 }
4673 }
4674
4675 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4676 AccessFlags class_access_flags,
4677 const Symbol* name,
4678 TRAPS) const {
4679 if (!_need_verify) { return; }
4680
4681 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4682 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4683 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4684 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4685 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4686 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4687 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4688 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4689 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4690 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4691 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4692 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4693 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4694 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4695 // LW401 CR required: removal of value factories support
4696 const bool is_interface = class_access_flags.is_interface();
4697 const bool is_identity_class = class_access_flags.is_identity_class();
4698 const bool is_abstract_class = class_access_flags.is_abstract();
4699
4700 bool is_illegal = false;
4701
4702 const char* class_note = "";
4703 if (is_interface) {
4704 if (major_gte_8) {
4705 // Class file version is JAVA_8_VERSION or later Methods of
4706 // interfaces may set any of the flags except ACC_PROTECTED,
4707 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4708 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4709 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4710 (is_native || is_protected || is_final || is_synchronized) ||
4711 // If a specific method of a class or interface has its
4712 // ACC_ABSTRACT flag set, it must not have any of its
4713 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4714 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4715 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4716 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4717 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4718 is_illegal = true;
4719 }
4720 } else if (major_gte_1_5) {
4721 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4722 if (!is_public || is_private || is_protected || is_static || is_final ||
4723 is_synchronized || is_native || !is_abstract || is_strict) {
4724 is_illegal = true;
4725 }
4726 } else {
4727 // Class file version is pre-JAVA_1_5_VERSION
4728 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4729 is_illegal = true;
4730 }
4731 }
4732 } else { // not interface
4733 if (has_illegal_visibility(flags)) {
4734 is_illegal = true;
4735 } else {
4736 if (is_initializer) {
4737 if (is_static || is_final || is_synchronized || is_native ||
4738 is_abstract || (major_gte_1_5 && is_bridge)) {
4739 is_illegal = true;
4740 }
4741 } else { // not initializer
4742 if (!is_identity_class && is_synchronized && !is_static) {
4743 is_illegal = true;
4744 class_note = " (not an identity class)";
4745 } else {
4746 if (is_abstract) {
4747 if ((is_final || is_native || is_private || is_static ||
4748 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4749 is_illegal = true;
4750 }
4751 }
4752 }
4753 }
4754 }
4755 }
4756
4757 if (is_illegal) {
4758 ResourceMark rm(THREAD);
4759 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4760 Exceptions::fthrow(
4761 THREAD_AND_LOCATION,
4762 vmSymbols::java_lang_ClassFormatError(),
4763 "Method %s in class %s%s has illegal modifiers: 0x%X",
4764 name->as_C_string(), _class_name->as_C_string(),
4765 class_note, flags);
4766 return;
4767 }
4768 }
4769
4770 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4771 int length,
4772 TRAPS) const {
4773 assert(_need_verify, "only called when _need_verify is true");
4774 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4775 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4776 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4777 }
4778 }
4779
4780 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4781 // In class names, '/' separates unqualified names. This is verified in this function also.
4782 // Method names also may not contain the characters '<' or '>', unless <init>
4783 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4784 // method. Because these names have been checked as special cases before
4785 // calling this method in verify_legal_method_name.
4803 if (type == ClassFileParser::LegalClass) {
4804 if (p == name || p+1 >= name+length ||
4805 *(p+1) == JVM_SIGNATURE_SLASH) {
4806 return false;
4807 }
4808 } else {
4809 return false; // do not permit '/' unless it's class name
4810 }
4811 break;
4812 case JVM_SIGNATURE_SPECIAL:
4813 case JVM_SIGNATURE_ENDSPECIAL:
4814 // do not permit '<' or '>' in method names
4815 if (type == ClassFileParser::LegalMethod) {
4816 return false;
4817 }
4818 }
4819 }
4820 return true;
4821 }
4822
4823 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4824 if (_loadable_descriptors == nullptr) return false;
4825 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4826 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4827 if (class_name == klass) return true;
4828 }
4829 return false;
4830 }
4831
4832 // Take pointer to a UTF8 byte string (not NUL-terminated).
4833 // Skip over the longest part of the string that could
4834 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4835 // Return a pointer to just past the fieldname.
4836 // Return null if no fieldname at all was found, or in the case of slash_ok
4837 // being true, we saw consecutive slashes (meaning we were looking for a
4838 // qualified path but found something that was badly-formed).
4839 static const char* skip_over_field_name(const char* const name,
4840 bool slash_ok,
4841 unsigned int length) {
4842 const char* p;
4843 jboolean last_is_slash = false;
4844 jboolean not_first_ch = false;
4845
4846 for (p = name; p != name + length; not_first_ch = true) {
4847 const char* old_p = p;
4848 jchar ch = *p;
4849 if (ch < 128) {
4850 p++;
4851 // quick check for ascii
4913 // be taken as a field signature. Allow "void" if void_ok.
4914 // Return a pointer to just past the signature.
4915 // Return null if no legal signature is found.
4916 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4917 bool void_ok,
4918 unsigned int length,
4919 TRAPS) const {
4920 unsigned int array_dim = 0;
4921 while (length > 0) {
4922 switch (signature[0]) {
4923 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4924 case JVM_SIGNATURE_BOOLEAN:
4925 case JVM_SIGNATURE_BYTE:
4926 case JVM_SIGNATURE_CHAR:
4927 case JVM_SIGNATURE_SHORT:
4928 case JVM_SIGNATURE_INT:
4929 case JVM_SIGNATURE_FLOAT:
4930 case JVM_SIGNATURE_LONG:
4931 case JVM_SIGNATURE_DOUBLE:
4932 return signature + 1;
4933 case JVM_SIGNATURE_CLASS:
4934 {
4935 if (_major_version < JAVA_1_5_VERSION) {
4936 signature++;
4937 length--;
4938 // Skip over the class name if one is there
4939 const char* const p = skip_over_field_name(signature, true, length);
4940 assert(p == nullptr || p > signature, "must parse one character at least");
4941 // The next character better be a semicolon
4942 if (p != nullptr && // Parse of field name succeeded.
4943 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4944 p[0] == JVM_SIGNATURE_ENDCLASS) {
4945 return p + 1;
4946 }
4947 }
4948 else {
4949 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4950 signature++;
4951 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4952 // Format check signature
4953 if (c != nullptr) {
4954 int newlen = pointer_delta_as_int(c, (char*) signature);
4955 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4956 if (!legal) {
4957 classfile_parse_error("Class name is empty or contains illegal character "
4958 "in descriptor in class file %s",
4959 THREAD);
4960 return nullptr;
4961 }
4962 return signature + newlen + 1;
4963 }
4964 }
4965 return nullptr;
4966 }
4967 case JVM_SIGNATURE_ARRAY:
4968 array_dim++;
4969 if (array_dim > 255) {
5052 THREAD_AND_LOCATION,
5053 vmSymbols::java_lang_ClassFormatError(),
5054 "Illegal field name \"%.*s\" in class %s", length, bytes,
5055 _class_name->as_C_string()
5056 );
5057 return;
5058 }
5059 }
5060
5061 // Checks if name is a legal method name.
5062 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5063 if (!_need_verify) { return; }
5064
5065 assert(name != nullptr, "method name is null");
5066 char* bytes = (char*)name->bytes();
5067 unsigned int length = name->utf8_length();
5068 bool legal = false;
5069
5070 if (length > 0) {
5071 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5072 if (name == vmSymbols::object_initializer_name() ||
5073 name == vmSymbols::class_initializer_name()) {
5074 legal = true;
5075 }
5076 } else if (_major_version < JAVA_1_5_VERSION) {
5077 const char* p;
5078 p = skip_over_field_name(bytes, false, length);
5079 legal = (p != nullptr) && ((p - bytes) == (int)length);
5080 } else {
5081 // 4881221: relax the constraints based on JSR202 spec
5082 legal = verify_unqualified_name(bytes, length, LegalMethod);
5083 }
5084 }
5085
5086 if (!legal) {
5087 ResourceMark rm(THREAD);
5088 assert(_class_name != nullptr, "invariant");
5089 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5090 Exceptions::fthrow(
5091 THREAD_AND_LOCATION,
5092 vmSymbols::java_lang_ClassFormatError(),
5093 "Illegal method name \"%.*s\" in class %s", length, bytes,
5094 _class_name->as_C_string()
5095 );
5096 return;
5097 }
5098 }
5099
5100 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5101 const char* const bytes = (const char*)signature->bytes();
5102 const unsigned int length = signature->utf8_length();
5103 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5104
5105 if (p == nullptr || (p - bytes) != (int)length) {
5106 return false;
5107 }
5108 return true;
5109 }
5110
5111 // Checks if signature is a legal field signature.
5112 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5113 const Symbol* signature,
5114 TRAPS) const {
5115 if (!_need_verify) { return; }
5116
5117 const char* const bytes = (const char*)signature->bytes();
5118 const unsigned int length = signature->utf8_length();
5119 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5120
5121 if (p == nullptr || (p - bytes) != (int)length) {
5122 throwIllegalSignature("Field", name, signature, CHECK);
5123 }
5124 }
5125
5126 // Check that the signature is compatible with the method name. For example,
5127 // check that <init> has a void signature.
5128 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5129 const Symbol* signature,
5130 TRAPS) const {
5131 if (!_need_verify) {
5132 return;
5133 }
5134
5135 // Class initializers cannot have args for class format version >= 51.
5136 if (name == vmSymbols::class_initializer_name() &&
5137 signature != vmSymbols::void_method_signature() &&
5138 _major_version >= JAVA_7_VERSION) {
5139 throwIllegalSignature("Method", name, signature, THREAD);
5140 return;
5141 }
5142
5143 int sig_length = signature->utf8_length();
5144 if (name->utf8_length() > 0 &&
5145 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5146 sig_length > 0 &&
5147 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5148 throwIllegalSignature("Method", name, signature, THREAD);
5149 }
5150 }
5151
5152 // Checks if signature is a legal method signature.
5153 // Returns number of parameters
5154 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5155 const Symbol* signature,
5156 TRAPS) const {
5157 if (!_need_verify) {
5158 // make sure caller's args_size will be less than 0 even for non-static
5159 // method so it will be recomputed in compute_size_of_parameters().
5160 return -2;
5161 }
5162
5163 unsigned int args_size = 0;
5164 const char* p = (const char*)signature->bytes();
5165 unsigned int length = signature->utf8_length();
5166 const char* nextp;
5167
5178 length -= pointer_delta_as_int(nextp, p);
5179 p = nextp;
5180 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5181 }
5182 // The first non-signature thing better be a ')'
5183 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5184 length--;
5185 // Now we better just have a return value
5186 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5187 if (nextp && ((int)length == (nextp - p))) {
5188 return args_size;
5189 }
5190 }
5191 }
5192 // Report error
5193 throwIllegalSignature("Method", name, signature, THREAD);
5194 return 0;
5195 }
5196
5197 int ClassFileParser::static_field_size() const {
5198 assert(_layout_info != nullptr, "invariant");
5199 return _layout_info->_static_field_size;
5200 }
5201
5202 int ClassFileParser::total_oop_map_count() const {
5203 assert(_layout_info != nullptr, "invariant");
5204 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5205 }
5206
5207 jint ClassFileParser::layout_size() const {
5208 assert(_layout_info != nullptr, "invariant");
5209 return _layout_info->_instance_size;
5210 }
5211
5212 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5213 const Array<Method*>* methods) {
5214 assert(ik != nullptr, "invariant");
5215 assert(methods != nullptr, "invariant");
5216
5217 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5218 // (We used to do this lazily, but now we query it in Rewriter,
5219 // which is eagerly done for every method, so we might as well do it now,
5220 // when everything is fresh in memory.)
5221 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5222
5223 if (klass_id != vmSymbolID::NO_SID) {
5224 for (int j = 0; j < methods->length(); ++j) {
5225 Method* method = methods->at(j);
5226 method->init_intrinsic_id(klass_id);
5227
5228 if (CheckIntrinsics) {
5229 // Check if an intrinsic is defined for method 'method',
5304 }
5305 }
5306
5307 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5308 const ClassInstanceInfo& cl_inst_info,
5309 TRAPS) {
5310 if (_klass != nullptr) {
5311 return _klass;
5312 }
5313
5314 InstanceKlass* const ik =
5315 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5316
5317 if (is_hidden()) {
5318 mangle_hidden_class_name(ik);
5319 }
5320
5321 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5322
5323 assert(_klass == ik, "invariant");
5324 return ik;
5325 }
5326
5327 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5328 bool changed_by_loadhook,
5329 const ClassInstanceInfo& cl_inst_info,
5330 TRAPS) {
5331 assert(ik != nullptr, "invariant");
5332
5333 // Set name and CLD before adding to CLD
5334 ik->set_class_loader_data(_loader_data);
5335 ik->set_class_loader_type();
5336 ik->set_name(_class_name);
5337
5338 // Add all classes to our internal class loader list here,
5339 // including classes in the bootstrap (null) class loader.
5340 const bool publicize = !is_internal();
5341
5342 _loader_data->add_class(ik, publicize);
5343
5344 set_klass_to_deallocate(ik);
5345
5346 assert(_layout_info != nullptr, "invariant");
5347 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5348 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5349 "sanity");
5350
5351 assert(ik->is_instance_klass(), "sanity");
5352 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5353
5354 // Fill in information already parsed
5355 ik->set_should_verify_class(_need_verify);
5356
5357 // Not yet: supers are done below to support the new subtype-checking fields
5358 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5359 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5360 ik->set_has_strict_static_fields(_has_strict_static_fields);
5361
5362 if (_layout_info->_is_naturally_atomic) {
5363 ik->set_is_naturally_atomic();
5364 }
5365
5366 if (_layout_info->_must_be_atomic) {
5367 ik->set_must_be_atomic();
5368 }
5369
5370 ik->set_static_oop_field_count(_static_oop_count);
5371
5372 // this transfers ownership of a lot of arrays from
5373 // the parser onto the InstanceKlass*
5374 apply_parsed_class_metadata(ik, _java_fields_count);
5375
5376 // can only set dynamic nest-host after static nest information is set
5377 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5378 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5379 }
5380
5381 // note that is not safe to use the fields in the parser from this point on
5382 assert(nullptr == _cp, "invariant");
5383 assert(nullptr == _fieldinfo_stream, "invariant");
5384 assert(nullptr == _fieldinfo_search_table, "invariant");
5385 assert(nullptr == _fields_status, "invariant");
5386 assert(nullptr == _methods, "invariant");
5387 assert(nullptr == _inner_classes, "invariant");
5388 assert(nullptr == _nest_members, "invariant");
5389 assert(nullptr == _loadable_descriptors, "invariant");
5390 assert(nullptr == _combined_annotations, "invariant");
5391 assert(nullptr == _record_components, "invariant");
5392 assert(nullptr == _permitted_subclasses, "invariant");
5393 assert(nullptr == _inline_layout_info_array, "invariant");
5394
5395 if (_has_localvariable_table) {
5396 ik->set_has_localvariable_table(true);
5397 }
5398
5399 if (_has_final_method) {
5400 ik->set_has_final_method();
5401 }
5402
5403 ik->copy_method_ordering(_method_ordering, CHECK);
5404 // The InstanceKlass::_methods_jmethod_ids cache
5405 // is managed on the assumption that the initial cache
5406 // size is equal to the number of methods in the class. If
5407 // that changes, then InstanceKlass::idnum_can_increment()
5408 // has to be changed accordingly.
5409 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5410
5411 ik->set_this_class_index(_this_class_index);
5412
5413 if (_is_hidden) {
5450 if ((_num_miranda_methods > 0) ||
5451 // if this class introduced new miranda methods or
5452 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5453 // super class exists and this class inherited miranda methods
5454 ) {
5455 ik->set_has_miranda_methods(); // then set a flag
5456 }
5457
5458 // Fill in information needed to compute superclasses.
5459 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5460 ik->set_transitive_interfaces(_transitive_interfaces);
5461 ik->set_local_interfaces(_local_interfaces);
5462 _transitive_interfaces = nullptr;
5463 _local_interfaces = nullptr;
5464
5465 // Initialize itable offset tables
5466 klassItable::setup_itable_offset_table(ik);
5467
5468 // Compute transitive closure of interfaces this class implements
5469 // Do final class setup
5470 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5471 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5472 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5473 }
5474
5475 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5476 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5477 ik->set_has_contended_annotations(true);
5478 }
5479
5480 // Fill in has_finalizer and layout_helper
5481 set_precomputed_flags(ik);
5482
5483 // check if this class can access its super class
5484 check_super_class_access(ik, CHECK);
5485
5486 // check if this class can access its superinterfaces
5487 check_super_interface_access(ik, CHECK);
5488
5489 // check if this class overrides any final method
5490 check_final_method_override(ik, CHECK);
5511
5512 assert(_all_mirandas != nullptr, "invariant");
5513
5514 // Generate any default methods - default methods are public interface methods
5515 // that have a default implementation. This is new with Java 8.
5516 if (_has_nonstatic_concrete_methods) {
5517 DefaultMethods::generate_default_methods(ik,
5518 _all_mirandas,
5519 CHECK);
5520 }
5521
5522 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5523 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5524 !module_entry->has_default_read_edges()) {
5525 if (!module_entry->set_has_default_read_edges()) {
5526 // We won a potential race
5527 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5528 }
5529 }
5530
5531 if (is_inline_type()) {
5532 InlineKlass* vk = InlineKlass::cast(ik);
5533 vk->set_payload_alignment(_layout_info->_payload_alignment);
5534 vk->set_payload_offset(_layout_info->_payload_offset);
5535 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5536 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5537 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5538 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5539 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5540 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5541 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5542 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5543 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5544 vk->initialize_calling_convention(CHECK);
5545 }
5546
5547 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5548 && _class_name != vmSymbols::java_lang_Object()) {
5549 // Both abstract and concrete value classes need a field map for acmp
5550 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5551 // Current format of acmp maps:
5552 // All maps are stored contiguously in a single int array because it might
5553 // be too early to instantiate an Object array (to be investigated)
5554 // Format is:
5555 // [number_of_nonoop_entries][offset0][size[0][offset1][size1]...[oop_offset0][oop_offset1]...
5556 // ^ ^
5557 // | |
5558 // --------------------- Pair of integer describing a segment of
5559 // contiguous non-oop fields
5560 // First element is the number of segment of contiguous non-oop fields
5561 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5562 // the offset then the size.
5563 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5564 // per oop field, containing the offset of the field.
5565 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5566 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5567 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1;
5568
5569 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK);
5570 typeArrayHandle map_h(THREAD, map);
5571 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK);
5572
5573 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5574 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length());
5575 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5576 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first);
5577 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second);
5578
5579 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data.
5580 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first);
5581 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second);
5582 }
5583 int oop_map_start = nonoop_acmp_map_size + 1;
5584 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5585 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5586 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5587 }
5588 assert(acmp_maps_array->length() == map_h->length(), "sanity");
5589 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5590 ik->set_acmp_maps_array(acmp_maps_array);
5591 }
5592
5593 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5594
5595 if (!is_internal()) {
5596 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5597
5598 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5599 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5600 log_is_enabled(Info, class, preview)) {
5601 ResourceMark rm;
5602 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5603 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5604 }
5605
5606 if (log_is_enabled(Debug, class, resolve)) {
5607 ResourceMark rm;
5608 // print out the superclass.
5609 const char * from = ik->external_name();
5610 if (ik->super() != nullptr) {
5611 log_debug(class, resolve)("%s %s (super)",
5612 from,
5653 const ClassLoadInfo* cl_info,
5654 Publicity pub_level,
5655 TRAPS) :
5656 _stream(stream),
5657 _class_name(nullptr),
5658 _loader_data(loader_data),
5659 _is_hidden(cl_info->is_hidden()),
5660 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5661 _orig_cp_size(0),
5662 _static_oop_count(0),
5663 _super_klass(),
5664 _cp(nullptr),
5665 _fieldinfo_stream(nullptr),
5666 _fieldinfo_search_table(nullptr),
5667 _fields_status(nullptr),
5668 _methods(nullptr),
5669 _inner_classes(nullptr),
5670 _nest_members(nullptr),
5671 _nest_host(0),
5672 _permitted_subclasses(nullptr),
5673 _loadable_descriptors(nullptr),
5674 _record_components(nullptr),
5675 _local_interfaces(nullptr),
5676 _local_interface_indexes(nullptr),
5677 _transitive_interfaces(nullptr),
5678 _combined_annotations(nullptr),
5679 _class_annotations(nullptr),
5680 _class_type_annotations(nullptr),
5681 _fields_annotations(nullptr),
5682 _fields_type_annotations(nullptr),
5683 _klass(nullptr),
5684 _klass_to_deallocate(nullptr),
5685 _parsed_annotations(nullptr),
5686 _layout_info(nullptr),
5687 _inline_layout_info_array(nullptr),
5688 _temp_field_info(nullptr),
5689 _method_ordering(nullptr),
5690 _all_mirandas(nullptr),
5691 _vtable_size(0),
5692 _itable_size(0),
5693 _num_miranda_methods(0),
5694 _protection_domain(cl_info->protection_domain()),
5695 _access_flags(),
5696 _pub_level(pub_level),
5697 _bad_constant_seen(0),
5698 _synthetic_flag(false),
5699 _sde_length(false),
5700 _sde_buffer(nullptr),
5701 _sourcefile_index(0),
5702 _generic_signature_index(0),
5703 _major_version(0),
5704 _minor_version(0),
5705 _this_class_index(0),
5706 _super_class_index(0),
5707 _itfs_len(0),
5708 _java_fields_count(0),
5709 _need_verify(false),
5710 _has_nonstatic_concrete_methods(false),
5711 _declares_nonstatic_concrete_methods(false),
5712 _has_localvariable_table(false),
5713 _has_final_method(false),
5714 _has_contended_fields(false),
5715 _has_aot_runtime_setup_method(false),
5716 _has_strict_static_fields(false),
5717 _is_naturally_atomic(false),
5718 _must_be_atomic(true),
5719 _has_loosely_consistent_annotation(false),
5720 _has_finalizer(false),
5721 _has_empty_finalizer(false),
5722 _max_bootstrap_specifier_index(-1) {
5723
5724 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5725 _class_name->increment_refcount();
5726
5727 assert(_loader_data != nullptr, "invariant");
5728 assert(stream != nullptr, "invariant");
5729 assert(_stream != nullptr, "invariant");
5730 assert(_stream->buffer() == _stream->current(), "invariant");
5731 assert(_class_name != nullptr, "invariant");
5732 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5733
5734 // Figure out whether we can skip format checking (matching classic VM behavior)
5735 // Always verify CFLH bytes from the user agents.
5736 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5737
5738 // synch back verification state to stream to check for truncation.
5739 stream->set_need_verify(_need_verify);
5740
5741 parse_stream(stream, CHECK);
5742
5743 post_process_parsed_stream(stream, _cp, CHECK);
5744 }
5745
5746 void ClassFileParser::clear_class_metadata() {
5747 // metadata created before the instance klass is created. Must be
5748 // deallocated if classfile parsing returns an error.
5749 _cp = nullptr;
5750 _fieldinfo_stream = nullptr;
5751 _fieldinfo_search_table = nullptr;
5752 _fields_status = nullptr;
5753 _methods = nullptr;
5754 _inner_classes = nullptr;
5755 _nest_members = nullptr;
5756 _permitted_subclasses = nullptr;
5757 _loadable_descriptors = nullptr;
5758 _combined_annotations = nullptr;
5759 _class_annotations = _class_type_annotations = nullptr;
5760 _fields_annotations = _fields_type_annotations = nullptr;
5761 _record_components = nullptr;
5762 _inline_layout_info_array = nullptr;
5763 }
5764
5765 // Destructor to clean up
5766 ClassFileParser::~ClassFileParser() {
5767 _class_name->decrement_refcount();
5768
5769 if (_cp != nullptr) {
5770 MetadataFactory::free_metadata(_loader_data, _cp);
5771 }
5772
5773 if (_fieldinfo_stream != nullptr) {
5774 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5775 }
5776 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5777
5778 if (_fields_status != nullptr) {
5779 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5780 }
5781
5782 if (_inline_layout_info_array != nullptr) {
5783 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5784 }
5785
5786 if (_methods != nullptr) {
5787 // Free methods
5788 InstanceKlass::deallocate_methods(_loader_data, _methods);
5789 }
5790
5791 // beware of the Universe::empty_blah_array!!
5792 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5793 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5794 }
5795
5796 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5797 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5798 }
5799
5800 if (_record_components != nullptr) {
5801 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5802 }
5803
5804 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5805 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5806 }
5807
5808 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5809 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5810 }
5811
5812 // Free interfaces
5813 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5814 _local_interfaces, _transitive_interfaces);
5815
5816 if (_combined_annotations != nullptr) {
5817 // After all annotations arrays have been created, they are installed into the
5818 // Annotations object that will be assigned to the InstanceKlass being created.
5819
5820 // Deallocate the Annotations object and the installed annotations arrays.
5821 _combined_annotations->deallocate_contents(_loader_data);
5822
5823 // If the _combined_annotations pointer is non-null,
5824 // then the other annotations fields should have been cleared.
5825 assert(_class_annotations == nullptr, "Should have been cleared");
5826 assert(_class_type_annotations == nullptr, "Should have been cleared");
5827 assert(_fields_annotations == nullptr, "Should have been cleared");
5828 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5829 } else {
5830 // If the annotations arrays were not installed into the Annotations object,
5831 // then they have to be deallocated explicitly.
5891
5892 assert(cp_size == (u2)cp->length(), "invariant");
5893
5894 // ACCESS FLAGS
5895 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5896
5897 // Access flags
5898 u2 flags;
5899 // JVM_ACC_MODULE is defined in JDK-9 and later.
5900 if (_major_version >= JAVA_9_VERSION) {
5901 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5902 } else {
5903 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5904 }
5905
5906 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5907 // Set abstract bit for old class files for backward compatibility
5908 flags |= JVM_ACC_ABSTRACT;
5909 }
5910
5911 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5912 if (!supports_inline_types()) {
5913 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5914 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5915 if (!is_module && !is_interface) {
5916 flags |= JVM_ACC_IDENTITY;
5917 }
5918 }
5919
5920 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5921
5922 short bad_constant = class_bad_constant_seen();
5923 if (bad_constant != 0) {
5924 // Do not throw CFE until after the access_flags are checked because if
5925 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5926 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5927 return;
5928 }
5929
5930 _access_flags.set_flags(flags);
5931
5932 // This class and superclass
5933 _this_class_index = stream->get_u2_fast();
5934 guarantee_property(
5935 valid_cp_range(_this_class_index, cp_size) &&
5936 cp->tag_at(_this_class_index).is_unresolved_klass(),
5937 "Invalid this class index %u in constant pool in class file %s",
5938 _this_class_index, CHECK);
5939
6003 }
6004 ls.cr();
6005 }
6006 }
6007
6008 // SUPERKLASS
6009 _super_class_index = stream->get_u2_fast();
6010 check_super_class(cp,
6011 _super_class_index,
6012 _need_verify,
6013 CHECK);
6014
6015 // Interfaces
6016 _itfs_len = stream->get_u2_fast();
6017 parse_interfaces(stream,
6018 _itfs_len,
6019 cp,
6020 &_has_nonstatic_concrete_methods,
6021 CHECK);
6022
6023 // Fields (offsets are filled in later)
6024 parse_fields(stream,
6025 _access_flags,
6026 cp,
6027 cp_size,
6028 &_java_fields_count,
6029 CHECK);
6030
6031 assert(_temp_field_info != nullptr, "invariant");
6032
6033 // Methods
6034 parse_methods(stream,
6035 is_interface(),
6036 !is_identity_class(),
6037 is_abstract_class(),
6038 &_has_localvariable_table,
6039 &_has_final_method,
6040 &_declares_nonstatic_concrete_methods,
6041 CHECK);
6042
6043 assert(_methods != nullptr, "invariant");
6044
6045 if (_declares_nonstatic_concrete_methods) {
6046 _has_nonstatic_concrete_methods = true;
6047 }
6048
6049 // Additional attributes/annotations
6050 _parsed_annotations = new ClassAnnotationCollector();
6051 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6052
6053 assert(_inner_classes != nullptr, "invariant");
6054
6055 // Finalize the Annotations metadata object,
6056 // now that all annotation arrays have been created.
6057 create_combined_annotations(CHECK);
6105 }
6106
6107 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6108 ConstantPool* cp,
6109 TRAPS) {
6110 assert(stream != nullptr, "invariant");
6111 assert(stream->at_eos(), "invariant");
6112 assert(cp != nullptr, "invariant");
6113 assert(_loader_data != nullptr, "invariant");
6114
6115 if (_class_name == vmSymbols::java_lang_Object()) {
6116 precond(_super_class_index == 0);
6117 precond(_super_klass == nullptr);
6118 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6119 "java.lang.Object cannot implement an interface in class file %s",
6120 CHECK);
6121 } else {
6122 // Set _super_klass after class file is parsed and format is checked
6123 assert(_super_class_index > 0, "any class other than Object must have a super class");
6124 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6125 if (is_interface()) {
6126 // Before attempting to resolve the superclass, check for class format
6127 // errors not checked yet.
6128 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6129 "Interfaces must have java.lang.Object as superclass in class file %s",
6130 CHECK);
6131 }
6132 Handle loader(THREAD, _loader_data->class_loader());
6133 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6134 // fast path to avoid lookup
6135 _super_klass = vmClasses::Object_klass();
6136 } else {
6137 _super_klass = (const InstanceKlass*)
6138 SystemDictionary::resolve_super_or_fail(_class_name,
6139 super_class_name,
6140 loader,
6141 true,
6142 CHECK);
6143 }
6144 }
6145
6146 if (_super_klass != nullptr) {
6147 if (_super_klass->is_interface()) {
6148 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6149 return;
6150 }
6151
6152 if (_super_klass->is_final()) {
6153 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6154 return;
6155 }
6156
6157 if (Arguments::is_valhalla_enabled()) {
6158 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6159 }
6160
6161 if (_super_klass->has_nonstatic_concrete_methods()) {
6162 _has_nonstatic_concrete_methods = true;
6163 }
6164 }
6165
6166 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6167 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6168 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6169 _class_name->as_klass_external_name()));
6170 }
6171
6172 // Determining if the class allows tearing or not (default is not)
6173 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6174 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6175 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6176 // Conditions above are not sufficient to determine atomicity requirements,
6177 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6178 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6179 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6180 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6181 _must_be_atomic = false;
6182 }
6183 // Apply VM options override
6184 if (*ForceNonTearable != '\0') {
6185 // Allow a command line switch to force the same atomicity property:
6186 const char* class_name_str = _class_name->as_C_string();
6187 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6188 _must_be_atomic = true;
6189 }
6190 }
6191 }
6192
6193 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6194 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6195 if (_local_interface_indexes != nullptr) {
6196 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6197 u2 interface_index = _local_interface_indexes->at(i);
6198 Klass* interf;
6199 if (cp->tag_at(interface_index).is_klass()) {
6200 interf = cp->resolved_klass_at(interface_index);
6201 } else {
6202 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6203
6204 // Don't need to check legal name because it's checked when parsing constant pool.
6205 // But need to make sure it's not an array type.
6206 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6207 "Bad interface name in class file %s", CHECK);
6208
6209 // Call resolve on the interface class name with class circularity checking
6210 interf = SystemDictionary::resolve_super_or_fail(
6211 _class_name,
6212 unresolved_klass,
6213 Handle(THREAD, _loader_data->class_loader()),
6214 false,
6215 CHECK);
6216 }
6217
6218 if (!interf->is_interface()) {
6219 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6220 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6221 _class_name->as_klass_external_name(),
6222 interf->external_name(),
6223 interf->class_in_module_of_loader()));
6224 }
6225
6226 if (Arguments::is_valhalla_enabled()) {
6227 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6228 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6229 }
6230
6231 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6232 _has_nonstatic_concrete_methods = true;
6233 }
6234 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6235 }
6236 }
6237 assert(_local_interfaces != nullptr, "invariant");
6238
6239 // Compute the transitive list of all unique interfaces implemented by this class
6240 _transitive_interfaces =
6241 compute_transitive_interfaces(_super_klass,
6242 _local_interfaces,
6243 _loader_data,
6244 CHECK);
6245
6246 assert(_transitive_interfaces != nullptr, "invariant");
6247
6248 // sort methods
6249 _method_ordering = sort_methods(_methods);
6250
6251 _all_mirandas = new GrowableArray<Method*>(20);
6252
6253 Handle loader(THREAD, _loader_data->class_loader());
6254 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6255 &_num_miranda_methods,
6256 _all_mirandas,
6257 _super_klass,
6258 _methods,
6259 _access_flags,
6260 _major_version,
6261 loader,
6262 _class_name,
6263 _local_interfaces);
6264
6265 // Size of Java itable (in words)
6266 _itable_size = is_interface() ? 0 :
6267 klassItable::compute_itable_size(_transitive_interfaces);
6268
6269 assert(_parsed_annotations != nullptr, "invariant");
6270
6271 if (Arguments::is_valhalla_enabled()) {
6272 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6273 FieldInfo fieldinfo = *it;
6274 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6275 Symbol* sig = fieldinfo.signature(cp);
6276 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6277 // Pre-load classes of null-free fields that are candidate for flattening
6278 TempNewSymbol s = Signature::strip_envelope(sig);
6279 if (s == _class_name) {
6280 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6281 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6282 }
6283 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6284 "Cause: a null-free non-static field is declared with this type",
6285 s->as_C_string(), _class_name->as_C_string());
6286 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection(_class_name, s,
6287 Handle(THREAD,
6288 _loader_data->class_loader()),
6289 false, THREAD);
6290 if (HAS_PENDING_EXCEPTION) {
6291 log_info(class, preload)("Preloading of class %s during loading of class %s "
6292 "(cause: null-free non-static field) failed: %s",
6293 s->as_C_string(), _class_name->as_C_string(),
6294 PENDING_EXCEPTION->klass()->name()->as_C_string());
6295 return; // Exception is still pending
6296 }
6297 assert(klass != nullptr, "Sanity check");
6298 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6299 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6300 log_info(class, preload)("Preloading of class %s during loading of class %s "
6301 "(cause: null-free non-static field) succeeded",
6302 s->as_C_string(), _class_name->as_C_string());
6303 } else if (Signature::has_envelope(sig) && PreloadClasses) {
6304 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6305 // Those classes would be required later for the flattening of nullable inline type fields
6306 TempNewSymbol name = Signature::strip_envelope(sig);
6307 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6308 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6309 "Cause: field type in LoadableDescriptors attribute",
6310 name->as_C_string(), _class_name->as_C_string());
6311 oop loader = loader_data()->class_loader();
6312 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6313 Handle(THREAD, loader),
6314 false, THREAD);
6315
6316 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6317
6318 if (klass != nullptr) {
6319 if (klass->is_inline_klass()) {
6320 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6321 log_info(class, preload)("Preloading of class %s during loading of class %s "
6322 "(cause: field type in LoadableDescriptors attribute) succeeded",
6323 name->as_C_string(), _class_name->as_C_string());
6324 } else {
6325 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log this
6326 log_info(class, preload)("Preloading of class %s during loading of class %s "
6327 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6328 name->as_C_string(), _class_name->as_C_string());
6329 }
6330 } else {
6331 log_info(class, preload)("Preloading of class %s during loading of class %s "
6332 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6333 name->as_C_string(), _class_name->as_C_string(),
6334 PENDING_EXCEPTION->klass()->name()->as_C_string());
6335
6336 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6337 // impact loading of current class.
6338 CLEAR_PENDING_EXCEPTION;
6339 }
6340 } else {
6341 // Just poking the system dictionary to see if the class has already be loaded. Looking for migrated classes
6342 // used when --enable-preview when jdk isn't compiled with --enable-preview so doesn't include LoadableDescriptors.
6343 // This is temporary.
6344 oop loader = loader_data()->class_loader();
6345 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6346 if (klass != nullptr && klass->is_inline_klass()) {
6347 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6348 log_info(class, preload)("Preloading of class %s during loading of class %s "
6349 "(cause: field type not in LoadableDescriptors attribute) succeeded",
6350 name->as_C_string(), _class_name->as_C_string());
6351 }
6352 }
6353 }
6354 }
6355 }
6356
6357 _layout_info = new FieldLayoutInfo();
6358 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6359 _parsed_annotations->is_contended(), is_inline_type(),
6360 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6361 _must_be_atomic, _layout_info, _inline_layout_info_array);
6362 lb.build_layout();
6363
6364 // If it turned out that we didn't inline any of the fields, we deallocate
6365 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6366 // transferred to the allocated InstanceKlass.
6367 if (_inline_layout_info_array != nullptr && !_layout_info->_has_inlined_fields) {
6368 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6369 _inline_layout_info_array = nullptr;
6370 }
6371
6372 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6373 _fieldinfo_stream =
6374 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6375 injected_fields_count, loader_data(), CHECK);
6376 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6377 _fields_status =
6378 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6379 FieldStatus(0), CHECK);
6380
6381 // Strict static fields track initialization status from the beginning of time.
6382 // After this class runs <clinit>, they will be verified as being "not unset".
6383 // See Step 8 of InstanceKlass::initialize_impl.
6384 if (_has_strict_static_fields) {
6385 bool found_one = false;
6386 for (int i = 0; i < _temp_field_info->length(); i++) {
6387 FieldInfo& fi = *_temp_field_info->adr_at(i);
6388 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6389 found_one = true;
6390 if (fi.initializer_index() != 0) {
6391 // skip strict static fields with ConstantValue attributes
6392 } else {
6393 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6394 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6395 }
6396 }
6397 }
6398 assert(found_one == _has_strict_static_fields,
6399 "correct prediction = %d", (int)_has_strict_static_fields);
6400 }
6401 }
6402
6403 void ClassFileParser::set_klass(InstanceKlass* klass) {
6404
6405 #ifdef ASSERT
6406 if (klass != nullptr) {
6407 assert(nullptr == _klass, "leaking?");
6408 }
6409 #endif
6410
6411 _klass = klass;
6412 }
6413
6414 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6415 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6416
6417 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6418 // never allocated for an InstanceKlass which has no need for this information.
6419 if (_inline_layout_info_array == nullptr) {
6420 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6421 java_fields_count(),
6422 CHECK);
6423 }
6424
6425 // Set the Klass for the field's index
6426 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6427 }
6428
6429 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6430
6431 #ifdef ASSERT
6432 if (klass != nullptr) {
6433 assert(nullptr == _klass_to_deallocate, "leaking?");
6434 }
6435 #endif
6436
6437 _klass_to_deallocate = klass;
6438 }
6439
6440 // Caller responsible for ResourceMark
6441 // clone stream with rewound position
6442 const ClassFileStream* ClassFileParser::clone_stream() const {
6443 assert(_stream != nullptr, "invariant");
6444
6445 return _stream->clone();
6446 }
6447
6448 ReferenceType ClassFileParser::super_reference_type() const {
|