4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "cds/cdsConfig.hpp"
25 #include "classfile/classFileParser.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoadInfo.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/fieldLayoutBuilder.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldInfo.hpp"
52 #include "oops/fieldStreams.inline.hpp"
53 #include "oops/instanceKlass.inline.hpp"
54 #include "oops/instanceMirrorKlass.hpp"
55 #include "oops/klass.inline.hpp"
56 #include "oops/klassVtable.hpp"
57 #include "oops/metadata.hpp"
58 #include "oops/method.inline.hpp"
59 #include "oops/oop.inline.hpp"
60 #include "oops/recordComponent.hpp"
61 #include "oops/symbol.hpp"
62 #include "prims/jvmtiExport.hpp"
63 #include "prims/jvmtiThreadState.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/fieldDescriptor.inline.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/os.hpp"
69 #include "runtime/perfData.hpp"
70 #include "runtime/reflection.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/signature.hpp"
73 #include "runtime/timer.hpp"
74 #include "services/classLoadingService.hpp"
75 #include "services/threadService.hpp"
76 #include "utilities/align.hpp"
77 #include "utilities/bitMap.inline.hpp"
78 #include "utilities/checkedCast.hpp"
79 #include "utilities/copy.hpp"
80 #include "utilities/formatBuffer.hpp"
81 #include "utilities/exceptions.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/growableArray.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/ostream.hpp"
86 #include "utilities/resourceHash.hpp"
87 #include "utilities/utf8.hpp"
88 #if INCLUDE_CDS
89 #include "classfile/systemDictionaryShared.hpp"
90 #endif
91 #if INCLUDE_JFR
92 #include "jfr/support/jfrTraceIdExtension.hpp"
93 #endif
94
95 // We generally try to create the oops directly when parsing, rather than
96 // allocating temporary data structures and copying the bytes twice. A
97 // temporary area is only needed when parsing utf8 entries in the constant
98 // pool and when parsing line number tables.
99
100 // We add assert in debug mode when class format is not checked.
101
102 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
103 #define JAVA_MIN_SUPPORTED_VERSION 45
104 #define JAVA_PREVIEW_MINOR_VERSION 65535
105
106 // Used for two backward compatibility reasons:
133 #define JAVA_14_VERSION 58
134
135 #define JAVA_15_VERSION 59
136
137 #define JAVA_16_VERSION 60
138
139 #define JAVA_17_VERSION 61
140
141 #define JAVA_18_VERSION 62
142
143 #define JAVA_19_VERSION 63
144
145 #define JAVA_20_VERSION 64
146
147 #define JAVA_21_VERSION 65
148
149 #define JAVA_22_VERSION 66
150
151 #define JAVA_23_VERSION 67
152
153 #define JAVA_24_VERSION 68
154
155 #define JAVA_25_VERSION 69
156
157 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
158 assert((bad_constant == JVM_CONSTANT_Module ||
159 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
160 "Unexpected bad constant pool entry");
161 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
162 }
163
164 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
165 ConstantPool* cp,
166 const int length,
167 TRAPS) {
168 assert(stream != nullptr, "invariant");
169 assert(cp != nullptr, "invariant");
170
171 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
172 // this function (_current can be allocated in a register, with scalar
175 // this method that uses stream().
176 const ClassFileStream cfs1 = *stream;
177 const ClassFileStream* const cfs = &cfs1;
178
179 DEBUG_ONLY(const u1* const old_current = stream->current();)
180
181 // Used for batching symbol allocations.
182 const char* names[SymbolTable::symbol_alloc_batch_size];
183 int lengths[SymbolTable::symbol_alloc_batch_size];
184 int indices[SymbolTable::symbol_alloc_batch_size];
185 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
186 int names_count = 0;
187
188 // parsing Index 0 is unused
189 for (int index = 1; index < length; index++) {
190 // Each of the following case guarantees one more byte in the stream
191 // for the following tag or the access_flags following constant pool,
192 // so we don't need bounds-check for reading tag.
193 const u1 tag = cfs->get_u1_fast();
194 switch (tag) {
195 case JVM_CONSTANT_Class : {
196 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
197 const u2 name_index = cfs->get_u2_fast();
198 cp->klass_index_at_put(index, name_index);
199 break;
200 }
201 case JVM_CONSTANT_Fieldref: {
202 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
203 const u2 class_index = cfs->get_u2_fast();
204 const u2 name_and_type_index = cfs->get_u2_fast();
205 cp->field_at_put(index, class_index, name_and_type_index);
206 break;
207 }
208 case JVM_CONSTANT_Methodref: {
209 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
210 const u2 class_index = cfs->get_u2_fast();
211 const u2 name_and_type_index = cfs->get_u2_fast();
212 cp->method_at_put(index, class_index, name_and_type_index);
213 break;
214 }
215 case JVM_CONSTANT_InterfaceMethodref: {
479 guarantee_property(valid_symbol_at(name_ref_index),
480 "Invalid constant pool index %u in class file %s",
481 name_ref_index, CHECK);
482 guarantee_property(valid_symbol_at(signature_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 signature_ref_index, CHECK);
485 break;
486 }
487 case JVM_CONSTANT_Utf8:
488 break;
489 case JVM_CONSTANT_UnresolvedClass: // fall-through
490 case JVM_CONSTANT_UnresolvedClassInError: {
491 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
492 break;
493 }
494 case JVM_CONSTANT_ClassIndex: {
495 const int class_index = cp->klass_index_at(index);
496 guarantee_property(valid_symbol_at(class_index),
497 "Invalid constant pool index %u in class file %s",
498 class_index, CHECK);
499 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
500 break;
501 }
502 case JVM_CONSTANT_StringIndex: {
503 const int string_index = cp->string_index_at(index);
504 guarantee_property(valid_symbol_at(string_index),
505 "Invalid constant pool index %u in class file %s",
506 string_index, CHECK);
507 Symbol* const sym = cp->symbol_at(string_index);
508 cp->unresolved_string_at_put(index, sym);
509 break;
510 }
511 case JVM_CONSTANT_MethodHandle: {
512 const int ref_index = cp->method_handle_index_at(index);
513 guarantee_property(valid_cp_range(ref_index, length),
514 "Invalid constant pool index %u in class file %s",
515 ref_index, CHECK);
516 const constantTag tag = cp->tag_at(ref_index);
517 const int ref_kind = cp->method_handle_ref_kind_at(index);
518
688 }
689 }
690 } else {
691 if (_need_verify) {
692 // Method name and signature are individually verified above, when iterating
693 // NameAndType_info. Need to check here that signature is non-zero length and
694 // the right type.
695 if (!Signature::is_method(signature)) {
696 throwIllegalSignature("Method", name, signature, CHECK);
697 }
698 }
699 // If a class method name begins with '<', it must be "<init>" and have void signature.
700 const unsigned int name_len = name->utf8_length();
701 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
702 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
703 if (name != vmSymbols::object_initializer_name()) {
704 classfile_parse_error(
705 "Bad method name at constant pool index %u in class file %s",
706 name_ref_index, THREAD);
707 return;
708 } else if (!Signature::is_void_method(signature)) { // must have void signature.
709 throwIllegalSignature("Method", name, signature, CHECK);
710 }
711 }
712 }
713 break;
714 }
715 case JVM_CONSTANT_MethodHandle: {
716 const int ref_index = cp->method_handle_index_at(index);
717 const int ref_kind = cp->method_handle_ref_kind_at(index);
718 switch (ref_kind) {
719 case JVM_REF_invokeVirtual:
720 case JVM_REF_invokeStatic:
721 case JVM_REF_invokeSpecial:
722 case JVM_REF_newInvokeSpecial: {
723 const int name_and_type_ref_index =
724 cp->uncached_name_and_type_ref_index_at(ref_index);
725 const int name_ref_index =
726 cp->name_ref_index_at(name_and_type_ref_index);
727 const Symbol* const name = cp->symbol_at(name_ref_index);
728 if (ref_kind == JVM_REF_newInvokeSpecial) {
729 if (name != vmSymbols::object_initializer_name()) {
730 classfile_parse_error(
731 "Bad constructor name at constant pool index %u in class file %s",
732 name_ref_index, THREAD);
733 return;
734 }
735 } else {
736 if (name == vmSymbols::object_initializer_name()) {
737 classfile_parse_error(
738 "Bad method name at constant pool index %u in class file %s",
739 name_ref_index, THREAD);
740 return;
741 }
742 }
743 break;
744 }
745 // Other ref_kinds are already fully checked in previous pass.
746 } // switch(ref_kind)
747 break;
748 }
749 case JVM_CONSTANT_MethodType: {
750 const Symbol* const no_name = vmSymbols::type_name(); // place holder
751 const Symbol* const signature = cp->method_type_signature_at(index);
752 verify_legal_method_signature(no_name, signature, CHECK);
753 break;
754 }
755 case JVM_CONSTANT_Utf8: {
756 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
768
769 NameSigHash(Symbol* name, Symbol* sig) :
770 _name(name),
771 _sig(sig) {}
772
773 static unsigned int hash(NameSigHash const& namesig) {
774 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
775 }
776
777 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
778 return (e0._name == e1._name) &&
779 (e0._sig == e1._sig);
780 }
781 };
782
783 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
784 NameSigHash::HASH_ROW_SIZE,
785 AnyObj::RESOURCE_AREA, mtInternal,
786 &NameSigHash::hash, &NameSigHash::equals>;
787
788 // Side-effects: populates the _local_interfaces field
789 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
790 const int itfs_len,
791 ConstantPool* const cp,
792 bool* const has_nonstatic_concrete_methods,
793 TRAPS) {
794 assert(stream != nullptr, "invariant");
795 assert(cp != nullptr, "invariant");
796 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
797
798 if (itfs_len == 0) {
799 _local_interfaces = Universe::the_empty_instance_klass_array();
800 } else {
801 assert(itfs_len > 0, "only called for len>0");
802 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
803
804 int index;
805 for (index = 0; index < itfs_len; index++) {
806 const u2 interface_index = stream->get_u2(CHECK);
807 Klass* interf;
808 guarantee_property(
809 valid_klass_reference_at(interface_index),
810 "Interface name has bad constant pool index %u in class file %s",
811 interface_index, CHECK);
812 if (cp->tag_at(interface_index).is_klass()) {
813 interf = cp->resolved_klass_at(interface_index);
814 } else {
815 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
816
817 // Don't need to check legal name because it's checked when parsing constant pool.
818 // But need to make sure it's not an array type.
819 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
820 "Bad interface name in class file %s", CHECK);
821
822 // Call resolve on the interface class name with class circularity checking
823 interf = SystemDictionary::resolve_super_or_fail(_class_name,
824 unresolved_klass,
825 Handle(THREAD, _loader_data->class_loader()),
826 false, CHECK);
827 }
828
829 if (!interf->is_interface()) {
830 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
831 err_msg("class %s can not implement %s, because it is not an interface (%s)",
832 _class_name->as_klass_external_name(),
833 interf->external_name(),
834 interf->class_in_module_of_loader()));
835 }
836
837 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
838 *has_nonstatic_concrete_methods = true;
839 }
840 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
841 }
842
843 if (!_need_verify || itfs_len <= 1) {
844 return;
845 }
846
847 // Check if there's any duplicates in interfaces
848 ResourceMark rm(THREAD);
849 // Set containing interface names
850 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
851 for (index = 0; index < itfs_len; index++) {
852 const InstanceKlass* const k = _local_interfaces->at(index);
853 Symbol* interface_name = k->name();
854 // If no duplicates, add (name, nullptr) in hashtable interface_names.
855 if (!interface_names->put(interface_name, 0)) {
856 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
857 interface_name->as_C_string(), THREAD);
858 return;
859 }
860 }
861 }
862 }
863
864 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
865 int constantvalue_index,
866 int signature_index,
867 TRAPS) const {
868 // Make sure the constant pool entry is of a type appropriate to this field
869 guarantee_property(
870 (constantvalue_index > 0 &&
871 constantvalue_index < cp->length()),
872 "Bad initial value index %u in ConstantValue attribute in class file %s",
873 constantvalue_index, CHECK);
920 class AnnotationCollector : public ResourceObj{
921 public:
922 enum Location { _in_field, _in_method, _in_class };
923 enum ID {
924 _unknown = 0,
925 _method_CallerSensitive,
926 _method_ForceInline,
927 _method_DontInline,
928 _method_ChangesCurrentThread,
929 _method_JvmtiHideEvents,
930 _method_JvmtiMountTransition,
931 _method_InjectedProfile,
932 _method_LambdaForm_Compiled,
933 _method_Hidden,
934 _method_Scoped,
935 _method_IntrinsicCandidate,
936 _jdk_internal_vm_annotation_Contended,
937 _field_Stable,
938 _jdk_internal_vm_annotation_ReservedStackAccess,
939 _jdk_internal_ValueBased,
940 _java_lang_Deprecated,
941 _java_lang_Deprecated_for_removal,
942 _annotation_LIMIT
943 };
944 const Location _location;
945 int _annotations_present;
946 u2 _contended_group;
947
948 AnnotationCollector(Location location)
949 : _location(location), _annotations_present(0), _contended_group(0)
950 {
951 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
952 }
953 // If this annotation name has an ID, report it (or _none).
954 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
955 // Set the annotation name:
956 void set_annotation(ID id) {
957 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
958 _annotations_present |= (int)nth_bit((int)id);
959 }
1342 }
1343
1344 *constantvalue_index_addr = constantvalue_index;
1345 *is_synthetic_addr = is_synthetic;
1346 *generic_signature_index_addr = generic_signature_index;
1347 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1348 runtime_visible_annotations_length,
1349 CHECK);
1350 parsed_annotations->set_field_annotations(a);
1351 a = allocate_annotations(runtime_visible_type_annotations,
1352 runtime_visible_type_annotations_length,
1353 CHECK);
1354 parsed_annotations->set_field_type_annotations(a);
1355 return;
1356 }
1357
1358
1359 // Side-effects: populates the _fields, _fields_annotations,
1360 // _fields_type_annotations fields
1361 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1362 bool is_interface,
1363 ConstantPool* cp,
1364 const int cp_size,
1365 u2* const java_fields_count_ptr,
1366 TRAPS) {
1367
1368 assert(cfs != nullptr, "invariant");
1369 assert(cp != nullptr, "invariant");
1370 assert(java_fields_count_ptr != nullptr, "invariant");
1371
1372 assert(nullptr == _fields_annotations, "invariant");
1373 assert(nullptr == _fields_type_annotations, "invariant");
1374
1375 cfs->guarantee_more(2, CHECK); // length
1376 const u2 length = cfs->get_u2_fast();
1377 *java_fields_count_ptr = length;
1378
1379 int num_injected = 0;
1380 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1381 &num_injected);
1382 const int total_fields = length + num_injected;
1383
1384 // Allocate a temporary resource array to collect field data.
1385 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1386 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1387
1388 ResourceMark rm(THREAD);
1389 for (int n = 0; n < length; n++) {
1390 // access_flags, name_index, descriptor_index, attributes_count
1391 cfs->guarantee_more(8, CHECK);
1392
1393 AccessFlags access_flags;
1394 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1395 verify_legal_field_modifiers(flags, is_interface, CHECK);
1396 access_flags.set_flags(flags);
1397 FieldInfo::FieldFlags fieldFlags(0);
1398
1399 const u2 name_index = cfs->get_u2_fast();
1400 guarantee_property(valid_symbol_at(name_index),
1401 "Invalid constant pool index %u for field name in class file %s",
1402 name_index, CHECK);
1403 const Symbol* const name = cp->symbol_at(name_index);
1404 verify_legal_field_name(name, CHECK);
1405
1406 const u2 signature_index = cfs->get_u2_fast();
1407 guarantee_property(valid_symbol_at(signature_index),
1408 "Invalid constant pool index %u for field signature in class file %s",
1409 signature_index, CHECK);
1410 const Symbol* const sig = cp->symbol_at(signature_index);
1411 verify_legal_field_signature(name, sig, CHECK);
1412
1413 u2 constantvalue_index = 0;
1414 bool is_synthetic = false;
1415 u2 generic_signature_index = 0;
1416 const bool is_static = access_flags.is_static();
1417 FieldAnnotationCollector parsed_annotations(_loader_data);
1418
1419 const u2 attributes_count = cfs->get_u2_fast();
1420 if (attributes_count > 0) {
1421 parse_field_attributes(cfs,
1422 attributes_count,
1423 is_static,
1424 signature_index,
1425 &constantvalue_index,
1426 &is_synthetic,
1427 &generic_signature_index,
1428 &parsed_annotations,
1429 CHECK);
1430
1431 if (parsed_annotations.field_annotations() != nullptr) {
1432 if (_fields_annotations == nullptr) {
1433 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1434 _loader_data, length, nullptr,
1435 CHECK);
1436 }
1437 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1438 parsed_annotations.set_field_annotations(nullptr);
1439 }
1440 if (parsed_annotations.field_type_annotations() != nullptr) {
1441 if (_fields_type_annotations == nullptr) {
1442 _fields_type_annotations =
1443 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1444 length,
1445 nullptr,
1446 CHECK);
1447 }
1448 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1449 parsed_annotations.set_field_type_annotations(nullptr);
1450 }
1451
1452 if (is_synthetic) {
1453 access_flags.set_is_synthetic();
1454 }
1455 if (generic_signature_index != 0) {
1456 fieldFlags.update_generic(true);
1457 }
1458 }
1459
1460 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1461
1462 // Update number of static oop fields.
1463 if (is_static && is_reference_type(type)) {
1464 _static_oop_count++;
1465 }
1466
1467 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1468 fi.set_index(n);
1469 if (fieldFlags.is_generic()) {
1470 fi.set_generic_signature_index(generic_signature_index);
1471 }
1472 parsed_annotations.apply_to(&fi);
1473 if (fi.field_flags().is_contended()) {
1474 _has_contended_fields = true;
1475 }
1476 _temp_field_info->append(fi);
1477 }
1478 assert(_temp_field_info->length() == length, "Must be");
1479
1480 int index = length;
1481 if (num_injected != 0) {
1482 for (int n = 0; n < num_injected; n++) {
1483 // Check for duplicates
1484 if (injected[n].may_be_java) {
1485 const Symbol* const name = injected[n].name();
1486 const Symbol* const signature = injected[n].signature();
1487 bool duplicate = false;
1488 for (int i = 0; i < length; i++) {
1489 const FieldInfo* const f = _temp_field_info->adr_at(i);
1490 if (name == cp->symbol_at(f->name_index()) &&
1491 signature == cp->symbol_at(f->signature_index())) {
1492 // Symbol is desclared in Java so skip this one
1493 duplicate = true;
1494 break;
1495 }
1496 }
1497 if (duplicate) {
1498 // These will be removed from the field array at the end
1499 continue;
1500 }
1501 }
1502
1503 // Injected field
1504 FieldInfo::FieldFlags fflags(0);
1505 fflags.update_injected(true);
1506 AccessFlags aflags;
1507 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1508 fi.set_index(index);
1509 _temp_field_info->append(fi);
1510 index++;
1511 }
1512 }
1513
1514 assert(_temp_field_info->length() == index, "Must be");
1515
1516 if (_need_verify && length > 1) {
1517 // Check duplicated fields
1518 ResourceMark rm(THREAD);
1519 // Set containing name-signature pairs
1520 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1521 for (int i = 0; i < _temp_field_info->length(); i++) {
1522 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1523 _temp_field_info->adr_at(i)->signature(_cp));
1524 // If no duplicates, add name/signature in hashtable names_and_sigs.
1525 if(!names_and_sigs->put(name_and_sig, 0)) {
1526 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1527 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1528 return;
1529 }
1530 }
1531 }
1532 }
1533
1534
1874 }
1875 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1876 if (_location != _in_field && _location != _in_class) {
1877 break; // only allow for fields and classes
1878 }
1879 if (!EnableContended || (RestrictContended && !privileged)) {
1880 break; // honor privileges
1881 }
1882 return _jdk_internal_vm_annotation_Contended;
1883 }
1884 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1885 if (_location != _in_method) break; // only allow for methods
1886 if (RestrictReservedStack && !privileged) break; // honor privileges
1887 return _jdk_internal_vm_annotation_ReservedStackAccess;
1888 }
1889 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1890 if (_location != _in_class) break; // only allow for classes
1891 if (!privileged) break; // only allow in privileged code
1892 return _jdk_internal_ValueBased;
1893 }
1894 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1895 return _java_lang_Deprecated;
1896 }
1897 default: {
1898 break;
1899 }
1900 }
1901 return AnnotationCollector::_unknown;
1902 }
1903
1904 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1905 if (is_contended())
1906 // Setting the contended group also sets the contended bit in field flags
1907 f->set_contended_group(contended_group());
1908 if (is_stable())
1909 (f->field_flags_addr())->update_stable(true);
1910 }
1911
1912 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1913 // If there's an error deallocate metadata for field annotations
2097 }
2098
2099 if (runtime_visible_type_annotations_length > 0) {
2100 a = allocate_annotations(runtime_visible_type_annotations,
2101 runtime_visible_type_annotations_length,
2102 CHECK);
2103 cm->set_type_annotations(a);
2104 }
2105 }
2106
2107
2108 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2109 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2110 // Method* to save footprint, so we only know the size of the resulting Method* when the
2111 // entire method attribute is parsed.
2112 //
2113 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2114
2115 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2116 bool is_interface,
2117 const ConstantPool* cp,
2118 bool* const has_localvariable_table,
2119 TRAPS) {
2120 assert(cfs != nullptr, "invariant");
2121 assert(cp != nullptr, "invariant");
2122 assert(has_localvariable_table != nullptr, "invariant");
2123
2124 ResourceMark rm(THREAD);
2125 // Parse fixed parts:
2126 // access_flags, name_index, descriptor_index, attributes_count
2127 cfs->guarantee_more(8, CHECK_NULL);
2128
2129 u2 flags = cfs->get_u2_fast();
2130 const u2 name_index = cfs->get_u2_fast();
2131 const int cp_size = cp->length();
2132 guarantee_property(
2133 valid_symbol_at(name_index),
2134 "Illegal constant pool index %u for method name in class file %s",
2135 name_index, CHECK_NULL);
2136 const Symbol* const name = cp->symbol_at(name_index);
2138
2139 const u2 signature_index = cfs->get_u2_fast();
2140 guarantee_property(
2141 valid_symbol_at(signature_index),
2142 "Illegal constant pool index %u for method signature in class file %s",
2143 signature_index, CHECK_NULL);
2144 const Symbol* const signature = cp->symbol_at(signature_index);
2145
2146 if (name == vmSymbols::class_initializer_name()) {
2147 // We ignore the other access flags for a valid class initializer.
2148 // (JVM Spec 2nd ed., chapter 4.6)
2149 if (_major_version < 51) { // backward compatibility
2150 flags = JVM_ACC_STATIC;
2151 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2152 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2153 } else {
2154 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2155 return nullptr;
2156 }
2157 } else {
2158 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2159 }
2160
2161 if (name == vmSymbols::object_initializer_name() && is_interface) {
2162 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2163 return nullptr;
2164 }
2165
2166 int args_size = -1; // only used when _need_verify is true
2167 if (_need_verify) {
2168 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2169 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2170 verify_legal_method_signature(name, signature, CHECK_NULL);
2171 if (args_size > MAX_ARGS_SIZE) {
2172 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2173 return nullptr;
2174 }
2175 }
2176
2177 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2178
2179 // Default values for code and exceptions attribute elements
2180 u2 max_stack = 0;
2181 u2 max_locals = 0;
2182 u4 code_length = 0;
2183 const u1* code_start = nullptr;
2184 u2 exception_table_length = 0;
2185 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2673 CHECK_NULL);
2674
2675 if (InstanceKlass::is_finalization_enabled() &&
2676 name == vmSymbols::finalize_method_name() &&
2677 signature == vmSymbols::void_method_signature()) {
2678 if (m->is_empty_method()) {
2679 _has_empty_finalizer = true;
2680 } else {
2681 _has_finalizer = true;
2682 }
2683 }
2684
2685 NOT_PRODUCT(m->verify());
2686 return m;
2687 }
2688
2689
2690 // Side-effects: populates the _methods field in the parser
2691 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2692 bool is_interface,
2693 bool* const has_localvariable_table,
2694 bool* has_final_method,
2695 bool* declares_nonstatic_concrete_methods,
2696 TRAPS) {
2697 assert(cfs != nullptr, "invariant");
2698 assert(has_localvariable_table != nullptr, "invariant");
2699 assert(has_final_method != nullptr, "invariant");
2700 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2701
2702 assert(nullptr == _methods, "invariant");
2703
2704 cfs->guarantee_more(2, CHECK); // length
2705 const u2 length = cfs->get_u2_fast();
2706 if (length == 0) {
2707 _methods = Universe::the_empty_method_array();
2708 } else {
2709 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2710 length,
2711 nullptr,
2712 CHECK);
2713
2714 for (int index = 0; index < length; index++) {
2715 Method* method = parse_method(cfs,
2716 is_interface,
2717 _cp,
2718 has_localvariable_table,
2719 CHECK);
2720
2721 if (method->is_final()) {
2722 *has_final_method = true;
2723 }
2724 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2725 // used for interface initialization, and default method inheritance analysis
2726 if (is_interface && !(*declares_nonstatic_concrete_methods)
2727 && !method->is_abstract() && !method->is_static()) {
2728 *declares_nonstatic_concrete_methods = true;
2729 }
2730 _methods->at_put(index, method);
2731 }
2732
2733 if (_need_verify && length > 1) {
2734 // Check duplicated methods
2735 ResourceMark rm(THREAD);
2736 // Set containing name-signature pairs
2962 valid_klass_reference_at(outer_class_info_index),
2963 "outer_class_info_index %u has bad constant type in class file %s",
2964 outer_class_info_index, CHECK_0);
2965
2966 if (outer_class_info_index != 0) {
2967 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
2968 char* bytes = (char*)outer_class_name->bytes();
2969 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
2970 "Outer class is an array class in class file %s", CHECK_0);
2971 }
2972 // Inner class name
2973 const u2 inner_name_index = cfs->get_u2_fast();
2974 guarantee_property(
2975 inner_name_index == 0 || valid_symbol_at(inner_name_index),
2976 "inner_name_index %u has bad constant type in class file %s",
2977 inner_name_index, CHECK_0);
2978 if (_need_verify) {
2979 guarantee_property(inner_class_info_index != outer_class_info_index,
2980 "Class is both outer and inner class in class file %s", CHECK_0);
2981 }
2982 // Access flags
2983 u2 flags;
2984 // JVM_ACC_MODULE is defined in JDK-9 and later.
2985 if (_major_version >= JAVA_9_VERSION) {
2986 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
2987 } else {
2988 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
2989 }
2990 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
2991 // Set abstract bit for old class files for backward compatibility
2992 flags |= JVM_ACC_ABSTRACT;
2993 }
2994 verify_legal_class_modifiers(flags, CHECK_0);
2995 AccessFlags inner_access_flags(flags);
2996
2997 inner_classes->at_put(index++, inner_class_info_index);
2998 inner_classes->at_put(index++, outer_class_info_index);
2999 inner_classes->at_put(index++, inner_name_index);
3000 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3001 }
3002
3003 // Check for circular and duplicate entries.
3004 bool has_circularity = false;
3005 if (_need_verify) {
3006 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3007 if (has_circularity) {
3008 // If circularity check failed then ignore InnerClasses attribute.
3009 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3010 index = 0;
3011 if (parsed_enclosingmethod_attribute) {
3012 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3013 _inner_classes = inner_classes;
3014 } else {
3078 if (length > 0) {
3079 int index = 0;
3080 cfs->guarantee_more(2 * length, CHECK_0);
3081 for (int n = 0; n < length; n++) {
3082 const u2 class_info_index = cfs->get_u2_fast();
3083 guarantee_property(
3084 valid_klass_reference_at(class_info_index),
3085 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3086 class_info_index, CHECK_0);
3087 permitted_subclasses->at_put(index++, class_info_index);
3088 }
3089 assert(index == size, "wrong size");
3090 }
3091
3092 // Restore buffer's current position.
3093 cfs->set_current(current_mark);
3094
3095 return length;
3096 }
3097
3098 // Record {
3099 // u2 attribute_name_index;
3100 // u4 attribute_length;
3101 // u2 components_count;
3102 // component_info components[components_count];
3103 // }
3104 // component_info {
3105 // u2 name_index;
3106 // u2 descriptor_index
3107 // u2 attributes_count;
3108 // attribute_info_attributes[attributes_count];
3109 // }
3110 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3111 const ConstantPool* cp,
3112 const u1* const record_attribute_start,
3113 TRAPS) {
3114 const u1* const current_mark = cfs->current();
3115 int components_count = 0;
3116 unsigned int calculate_attr_size = 0;
3117 if (record_attribute_start != nullptr) {
3343 }
3344 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3345 "Bad length on BootstrapMethods in class file %s",
3346 CHECK);
3347 }
3348
3349 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3350 ConstantPool* cp,
3351 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3352 TRAPS) {
3353 assert(cfs != nullptr, "invariant");
3354 assert(cp != nullptr, "invariant");
3355 assert(parsed_annotations != nullptr, "invariant");
3356
3357 // Set inner classes attribute to default sentinel
3358 _inner_classes = Universe::the_empty_short_array();
3359 // Set nest members attribute to default sentinel
3360 _nest_members = Universe::the_empty_short_array();
3361 // Set _permitted_subclasses attribute to default sentinel
3362 _permitted_subclasses = Universe::the_empty_short_array();
3363 cfs->guarantee_more(2, CHECK); // attributes_count
3364 u2 attributes_count = cfs->get_u2_fast();
3365 bool parsed_sourcefile_attribute = false;
3366 bool parsed_innerclasses_attribute = false;
3367 bool parsed_nest_members_attribute = false;
3368 bool parsed_permitted_subclasses_attribute = false;
3369 bool parsed_nest_host_attribute = false;
3370 bool parsed_record_attribute = false;
3371 bool parsed_enclosingmethod_attribute = false;
3372 bool parsed_bootstrap_methods_attribute = false;
3373 const u1* runtime_visible_annotations = nullptr;
3374 int runtime_visible_annotations_length = 0;
3375 const u1* runtime_visible_type_annotations = nullptr;
3376 int runtime_visible_type_annotations_length = 0;
3377 bool runtime_invisible_type_annotations_exists = false;
3378 bool runtime_invisible_annotations_exists = false;
3379 bool parsed_source_debug_ext_annotations_exist = false;
3380 const u1* inner_classes_attribute_start = nullptr;
3381 u4 inner_classes_attribute_length = 0;
3382 u2 enclosing_method_class_index = 0;
3383 u2 enclosing_method_method_index = 0;
3384 const u1* nest_members_attribute_start = nullptr;
3385 u4 nest_members_attribute_length = 0;
3386 const u1* record_attribute_start = nullptr;
3387 u4 record_attribute_length = 0;
3388 const u1* permitted_subclasses_attribute_start = nullptr;
3389 u4 permitted_subclasses_attribute_length = 0;
3390
3391 // Iterate over attributes
3392 while (attributes_count--) {
3393 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3394 const u2 attribute_name_index = cfs->get_u2_fast();
3395 const u4 attribute_length = cfs->get_u4_fast();
3396 guarantee_property(
3397 valid_symbol_at(attribute_name_index),
3398 "Attribute name has bad constant pool index %u in class file %s",
3399 attribute_name_index, CHECK);
3400 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3401 if (tag == vmSymbols::tag_source_file()) {
3402 // Check for SourceFile tag
3403 if (_need_verify) {
3404 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3405 }
3406 if (parsed_sourcefile_attribute) {
3407 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3408 return;
3409 } else {
3585 return;
3586 }
3587 parsed_record_attribute = true;
3588 record_attribute_start = cfs->current();
3589 record_attribute_length = attribute_length;
3590 } else if (_major_version >= JAVA_17_VERSION) {
3591 if (tag == vmSymbols::tag_permitted_subclasses()) {
3592 if (parsed_permitted_subclasses_attribute) {
3593 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3594 return;
3595 }
3596 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3597 if (_access_flags.is_final()) {
3598 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3599 return;
3600 }
3601 parsed_permitted_subclasses_attribute = true;
3602 permitted_subclasses_attribute_start = cfs->current();
3603 permitted_subclasses_attribute_length = attribute_length;
3604 }
3605 }
3606 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3607 cfs->skip_u1(attribute_length, CHECK);
3608 } else {
3609 // Unknown attribute
3610 cfs->skip_u1(attribute_length, CHECK);
3611 }
3612 } else {
3613 // Unknown attribute
3614 cfs->skip_u1(attribute_length, CHECK);
3615 }
3616 } else {
3617 // Unknown attribute
3618 cfs->skip_u1(attribute_length, CHECK);
3619 }
3620 }
3621 _class_annotations = allocate_annotations(runtime_visible_annotations,
3622 runtime_visible_annotations_length,
3623 CHECK);
3624 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3661 CHECK);
3662 if (_need_verify) {
3663 guarantee_property(record_attribute_length == calculated_attr_length,
3664 "Record attribute has wrong length in class file %s",
3665 CHECK);
3666 }
3667 }
3668
3669 if (parsed_permitted_subclasses_attribute) {
3670 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3671 cfs,
3672 permitted_subclasses_attribute_start,
3673 CHECK);
3674 if (_need_verify) {
3675 guarantee_property(
3676 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3677 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3678 }
3679 }
3680
3681 if (_max_bootstrap_specifier_index >= 0) {
3682 guarantee_property(parsed_bootstrap_methods_attribute,
3683 "Missing BootstrapMethods attribute in class file %s", CHECK);
3684 }
3685 }
3686
3687 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3688 assert(k != nullptr, "invariant");
3689
3690 if (_synthetic_flag)
3691 k->set_is_synthetic();
3692 if (_sourcefile_index != 0) {
3693 k->set_source_file_name_index(_sourcefile_index);
3694 }
3695 if (_generic_signature_index != 0) {
3696 k->set_generic_signature_index(_generic_signature_index);
3697 }
3698 if (_sde_buffer != nullptr) {
3699 k->set_source_debug_extension(_sde_buffer, _sde_length);
3700 }
3726 _class_annotations = nullptr;
3727 _class_type_annotations = nullptr;
3728 _fields_annotations = nullptr;
3729 _fields_type_annotations = nullptr;
3730 }
3731
3732 // Transfer ownership of metadata allocated to the InstanceKlass.
3733 void ClassFileParser::apply_parsed_class_metadata(
3734 InstanceKlass* this_klass,
3735 int java_fields_count) {
3736 assert(this_klass != nullptr, "invariant");
3737
3738 _cp->set_pool_holder(this_klass);
3739 this_klass->set_constants(_cp);
3740 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3741 this_klass->set_fields_status(_fields_status);
3742 this_klass->set_methods(_methods);
3743 this_klass->set_inner_classes(_inner_classes);
3744 this_klass->set_nest_members(_nest_members);
3745 this_klass->set_nest_host_index(_nest_host);
3746 this_klass->set_annotations(_combined_annotations);
3747 this_klass->set_permitted_subclasses(_permitted_subclasses);
3748 this_klass->set_record_components(_record_components);
3749
3750 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3751 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3752 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3753 // its _super. If an OOM occurs while loading the current klass, its _super field
3754 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3755 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3756 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3757
3758 // Clear out these fields so they don't get deallocated by the destructor
3759 clear_class_metadata();
3760 }
3761
3762 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3763 int anno_length,
3764 TRAPS) {
3765 AnnotationArray* annotations = nullptr;
3766 if (anno != nullptr) {
3767 annotations = MetadataFactory::new_array<u1>(_loader_data,
3768 anno_length,
3769 CHECK_(annotations));
3770 for (int i = 0; i < anno_length; i++) {
3771 annotations->at_put(i, anno[i]);
3772 }
3773 }
3774 return annotations;
3775 }
3776
3777 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3778 const int super_class_index,
3779 const bool need_verify,
3780 TRAPS) {
3781 assert(cp != nullptr, "invariant");
3782 const InstanceKlass* super_klass = nullptr;
3783
3784 if (super_class_index == 0) {
3785 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3786 "Invalid superclass index %u in class file %s",
3787 super_class_index,
3788 CHECK_NULL);
3789 } else {
3790 guarantee_property(valid_klass_reference_at(super_class_index),
3791 "Invalid superclass index %u in class file %s",
3792 super_class_index,
3793 CHECK_NULL);
3794 // The class name should be legal because it is checked when parsing constant pool.
3795 // However, make sure it is not an array type.
3796 bool is_array = false;
3797 if (cp->tag_at(super_class_index).is_klass()) {
3798 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3799 if (need_verify)
3800 is_array = super_klass->is_array_klass();
3801 } else if (need_verify) {
3802 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3803 }
3804 if (need_verify) {
3805 guarantee_property(!is_array,
3806 "Bad superclass name in class file %s", CHECK_NULL);
3807 }
3808 }
3809 return super_klass;
3810 }
3811
3812 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3813 _max_nonstatic_oop_maps = max_blocks;
3814 _nonstatic_oop_map_count = 0;
3815 if (max_blocks == 0) {
3816 _nonstatic_oop_maps = nullptr;
3817 } else {
3818 _nonstatic_oop_maps =
3819 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3820 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3821 }
3822 }
3823
3824 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3958
3959 // Check if this klass supports the java.lang.Cloneable interface
3960 if (vmClasses::Cloneable_klass_loaded()) {
3961 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
3962 ik->set_is_cloneable();
3963 }
3964 }
3965
3966 // If it cannot be fast-path allocated, set a bit in the layout helper.
3967 // See documentation of InstanceKlass::can_be_fastpath_allocated().
3968 assert(ik->size_helper() > 0, "layout_helper is initialized");
3969 if (ik->is_abstract() || ik->is_interface()
3970 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3971 || ik->size_helper() >= FastAllocateSizeLimit) {
3972 // Forbid fast-path allocation.
3973 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3974 ik->set_layout_helper(lh);
3975 }
3976 }
3977
3978 // utility methods for appending an array with check for duplicates
3979
3980 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
3981 const Array<InstanceKlass*>* const ifs) {
3982 // iterate over new interfaces
3983 for (int i = 0; i < ifs->length(); i++) {
3984 InstanceKlass* const e = ifs->at(i);
3985 assert(e->is_klass() && e->is_interface(), "just checking");
3986 // add new interface
3987 result->append_if_missing(e);
3988 }
3989 }
3990
3991 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
3992 Array<InstanceKlass*>* local_ifs,
3993 ClassLoaderData* loader_data,
3994 TRAPS) {
3995 assert(local_ifs != nullptr, "invariant");
3996 assert(loader_data != nullptr, "invariant");
3997
4001 // Add superclass transitive interfaces size
4002 if (super != nullptr) {
4003 super_size = super->transitive_interfaces()->length();
4004 max_transitive_size += super_size;
4005 }
4006 // Add local interfaces' super interfaces
4007 const int local_size = local_ifs->length();
4008 for (int i = 0; i < local_size; i++) {
4009 InstanceKlass* const l = local_ifs->at(i);
4010 max_transitive_size += l->transitive_interfaces()->length();
4011 }
4012 // Finally add local interfaces
4013 max_transitive_size += local_size;
4014 // Construct array
4015 if (max_transitive_size == 0) {
4016 // no interfaces, use canonicalized array
4017 return Universe::the_empty_instance_klass_array();
4018 } else if (max_transitive_size == super_size) {
4019 // no new local interfaces added, share superklass' transitive interface array
4020 return super->transitive_interfaces();
4021 } else if (max_transitive_size == local_size) {
4022 // only local interfaces added, share local interface array
4023 return local_ifs;
4024 } else {
4025 ResourceMark rm;
4026 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4027
4028 // Copy down from superclass
4029 if (super != nullptr) {
4030 append_interfaces(result, super->transitive_interfaces());
4031 }
4032
4033 // Copy down from local interfaces' superinterfaces
4034 for (int i = 0; i < local_size; i++) {
4035 InstanceKlass* const l = local_ifs->at(i);
4036 append_interfaces(result, l->transitive_interfaces());
4037 }
4038 // Finally add local interfaces
4039 append_interfaces(result, local_ifs);
4040
4041 // length will be less than the max_transitive_size if duplicates were removed
4042 const int length = result->length();
4043 assert(length <= max_transitive_size, "just checking");
4044 Array<InstanceKlass*>* const new_result =
4045 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4046 for (int i = 0; i < length; i++) {
4047 InstanceKlass* const e = result->at(i);
4048 assert(e != nullptr, "just checking");
4049 new_result->at_put(i, e);
4050 }
4051 return new_result;
4052 }
4053 }
4054
4055 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4056 assert(this_klass != nullptr, "invariant");
4057 const Klass* const super = this_klass->super();
4058
4059 if (super != nullptr) {
4060 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4061
4062 if (super->is_final()) {
4063 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4064 return;
4065 }
4066
4067 if (super_ik->is_sealed()) {
4068 stringStream ss;
4069 ResourceMark rm(THREAD);
4070 if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
4071 classfile_icce_error(ss.as_string(), THREAD);
4072 return;
4073 }
4074 }
4075
4076 Reflection::VerifyClassAccessResults vca_result =
4077 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4078 if (vca_result != Reflection::ACCESS_OK) {
4079 ResourceMark rm(THREAD);
4080 char* msg = Reflection::verify_class_access_msg(this_klass,
4081 InstanceKlass::cast(super),
4082 vca_result);
4083
4084 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4085 if (msg == nullptr) {
4086 bool same_module = (this_klass->module() == super->module());
4087 Exceptions::fthrow(
4088 THREAD_AND_LOCATION,
4089 vmSymbols::java_lang_IllegalAccessError(),
4090 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4091 this_klass->external_name(),
4092 super->is_abstract() ? "abstract " : "",
4093 super->external_name(),
4094 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4095 (same_module) ? "" : "; ",
4228 const Method* const m = methods->at(index);
4229 // if m is static and not the init method, throw a verify error
4230 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4231 ResourceMark rm(THREAD);
4232
4233 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4234 Exceptions::fthrow(
4235 THREAD_AND_LOCATION,
4236 vmSymbols::java_lang_VerifyError(),
4237 "Illegal static method %s in interface %s",
4238 m->name()->as_C_string(),
4239 this_klass->external_name()
4240 );
4241 return;
4242 }
4243 }
4244 }
4245
4246 // utility methods for format checking
4247
4248 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4249 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4250 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4251 if (is_module) {
4252 ResourceMark rm(THREAD);
4253 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4254 Exceptions::fthrow(
4255 THREAD_AND_LOCATION,
4256 vmSymbols::java_lang_NoClassDefFoundError(),
4257 "%s is not a class because access_flag ACC_MODULE is set",
4258 _class_name->as_C_string());
4259 return;
4260 }
4261
4262 if (!_need_verify) { return; }
4263
4264 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4265 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4266 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4267 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4268 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4269 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4270 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4271
4272 if ((is_abstract && is_final) ||
4273 (is_interface && !is_abstract) ||
4274 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4275 (!is_interface && major_gte_1_5 && is_annotation)) {
4276 ResourceMark rm(THREAD);
4277 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4278 Exceptions::fthrow(
4279 THREAD_AND_LOCATION,
4280 vmSymbols::java_lang_ClassFormatError(),
4281 "Illegal class modifiers in class %s: 0x%X",
4282 _class_name->as_C_string(), flags
4283 );
4284 return;
4285 }
4286 }
4287
4288 static bool has_illegal_visibility(jint flags) {
4289 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4290 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4291 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4292
4293 return ((is_public && is_protected) ||
4294 (is_public && is_private) ||
4295 (is_protected && is_private));
4296 }
4297
4298 // A legal major_version.minor_version must be one of the following:
4299 //
4300 // Major_version >= 45 and major_version < 56, any minor_version.
4301 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4302 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4303 //
4304 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4332 THREAD_AND_LOCATION,
4333 vmSymbols::java_lang_UnsupportedClassVersionError(),
4334 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4335 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4336 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4337 return;
4338 }
4339
4340 if (!Arguments::enable_preview()) {
4341 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4342 class_name, major, minor, THREAD);
4343 return;
4344 }
4345
4346 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4347 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4348 class_name, major, minor, THREAD);
4349 }
4350 }
4351
4352 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4353 bool is_interface,
4354 TRAPS) const {
4355 if (!_need_verify) { return; }
4356
4357 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4358 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4359 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4360 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4361 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4362 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4363 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4364 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4365 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4366
4367 bool is_illegal = false;
4368
4369 if (is_interface) {
4370 if (!is_public || !is_static || !is_final || is_private ||
4371 is_protected || is_volatile || is_transient ||
4372 (major_gte_1_5 && is_enum)) {
4373 is_illegal = true;
4374 }
4375 } else { // not interface
4376 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4377 is_illegal = true;
4378 }
4379 }
4380
4381 if (is_illegal) {
4382 ResourceMark rm(THREAD);
4383 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4384 Exceptions::fthrow(
4385 THREAD_AND_LOCATION,
4386 vmSymbols::java_lang_ClassFormatError(),
4387 "Illegal field modifiers in class %s: 0x%X",
4388 _class_name->as_C_string(), flags);
4389 return;
4390 }
4391 }
4392
4393 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4394 bool is_interface,
4395 const Symbol* name,
4396 TRAPS) const {
4397 if (!_need_verify) { return; }
4398
4399 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4400 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4401 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4402 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4403 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4404 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4405 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4406 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4407 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4408 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4409 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4410 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4411 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4412 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4413
4414 bool is_illegal = false;
4415
4416 if (is_interface) {
4417 if (major_gte_8) {
4418 // Class file version is JAVA_8_VERSION or later Methods of
4419 // interfaces may set any of the flags except ACC_PROTECTED,
4420 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4421 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4422 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4423 (is_native || is_protected || is_final || is_synchronized) ||
4424 // If a specific method of a class or interface has its
4425 // ACC_ABSTRACT flag set, it must not have any of its
4426 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4427 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4428 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4429 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4430 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4431 is_illegal = true;
4432 }
4433 } else if (major_gte_1_5) {
4434 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4435 if (!is_public || is_private || is_protected || is_static || is_final ||
4436 is_synchronized || is_native || !is_abstract || is_strict) {
4437 is_illegal = true;
4438 }
4439 } else {
4440 // Class file version is pre-JAVA_1_5_VERSION
4441 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4442 is_illegal = true;
4443 }
4444 }
4445 } else { // not interface
4446 if (has_illegal_visibility(flags)) {
4447 is_illegal = true;
4448 } else {
4449 if (is_initializer) {
4450 if (is_static || is_final || is_synchronized || is_native ||
4451 is_abstract || (major_gte_1_5 && is_bridge)) {
4452 is_illegal = true;
4453 }
4454 } else { // not initializer
4455 if (is_abstract) {
4456 if ((is_final || is_native || is_private || is_static ||
4457 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4458 is_illegal = true;
4459 }
4460 }
4461 }
4462 }
4463 }
4464
4465 if (is_illegal) {
4466 ResourceMark rm(THREAD);
4467 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4468 Exceptions::fthrow(
4469 THREAD_AND_LOCATION,
4470 vmSymbols::java_lang_ClassFormatError(),
4471 "Method %s in class %s has illegal modifiers: 0x%X",
4472 name->as_C_string(), _class_name->as_C_string(), flags);
4473 return;
4474 }
4475 }
4476
4477 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4478 int length,
4479 TRAPS) const {
4480 assert(_need_verify, "only called when _need_verify is true");
4481 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4482 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4483 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4484 }
4485 }
4486
4487 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4488 // In class names, '/' separates unqualified names. This is verified in this function also.
4489 // Method names also may not contain the characters '<' or '>', unless <init>
4490 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4491 // method. Because these names have been checked as special cases before
4492 // calling this method in verify_legal_method_name.
4510 if (type == ClassFileParser::LegalClass) {
4511 if (p == name || p+1 >= name+length ||
4512 *(p+1) == JVM_SIGNATURE_SLASH) {
4513 return false;
4514 }
4515 } else {
4516 return false; // do not permit '/' unless it's class name
4517 }
4518 break;
4519 case JVM_SIGNATURE_SPECIAL:
4520 case JVM_SIGNATURE_ENDSPECIAL:
4521 // do not permit '<' or '>' in method names
4522 if (type == ClassFileParser::LegalMethod) {
4523 return false;
4524 }
4525 }
4526 }
4527 return true;
4528 }
4529
4530 // Take pointer to a UTF8 byte string (not NUL-terminated).
4531 // Skip over the longest part of the string that could
4532 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4533 // Return a pointer to just past the fieldname.
4534 // Return null if no fieldname at all was found, or in the case of slash_ok
4535 // being true, we saw consecutive slashes (meaning we were looking for a
4536 // qualified path but found something that was badly-formed).
4537 static const char* skip_over_field_name(const char* const name,
4538 bool slash_ok,
4539 unsigned int length) {
4540 const char* p;
4541 jboolean last_is_slash = false;
4542 jboolean not_first_ch = false;
4543
4544 for (p = name; p != name + length; not_first_ch = true) {
4545 const char* old_p = p;
4546 jchar ch = *p;
4547 if (ch < 128) {
4548 p++;
4549 // quick check for ascii
4611 // be taken as a field signature. Allow "void" if void_ok.
4612 // Return a pointer to just past the signature.
4613 // Return null if no legal signature is found.
4614 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4615 bool void_ok,
4616 unsigned int length,
4617 TRAPS) const {
4618 unsigned int array_dim = 0;
4619 while (length > 0) {
4620 switch (signature[0]) {
4621 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4622 case JVM_SIGNATURE_BOOLEAN:
4623 case JVM_SIGNATURE_BYTE:
4624 case JVM_SIGNATURE_CHAR:
4625 case JVM_SIGNATURE_SHORT:
4626 case JVM_SIGNATURE_INT:
4627 case JVM_SIGNATURE_FLOAT:
4628 case JVM_SIGNATURE_LONG:
4629 case JVM_SIGNATURE_DOUBLE:
4630 return signature + 1;
4631 case JVM_SIGNATURE_CLASS: {
4632 if (_major_version < JAVA_1_5_VERSION) {
4633 // Skip over the class name if one is there
4634 const char* const p = skip_over_field_name(signature + 1, true, --length);
4635
4636 // The next character better be a semicolon
4637 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4638 return p + 1;
4639 }
4640 }
4641 else {
4642 // Skip leading 'L' and ignore first appearance of ';'
4643 signature++;
4644 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4645 // Format check signature
4646 if (c != nullptr) {
4647 int newlen = pointer_delta_as_int(c, (char*) signature);
4648 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4649 if (!legal) {
4650 classfile_parse_error("Class name is empty or contains illegal character "
4651 "in descriptor in class file %s",
4652 THREAD);
4653 return nullptr;
4654 }
4655 return signature + newlen + 1;
4656 }
4657 }
4658 return nullptr;
4659 }
4660 case JVM_SIGNATURE_ARRAY:
4661 array_dim++;
4662 if (array_dim > 255) {
4678
4679 // Checks if name is a legal class name.
4680 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4681 if (!_need_verify) { return; }
4682
4683 assert(name->refcount() > 0, "symbol must be kept alive");
4684 char* bytes = (char*)name->bytes();
4685 unsigned int length = name->utf8_length();
4686 bool legal = false;
4687
4688 if (length > 0) {
4689 const char* p;
4690 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4691 p = skip_over_field_signature(bytes, false, length, CHECK);
4692 legal = (p != nullptr) && ((p - bytes) == (int)length);
4693 } else if (_major_version < JAVA_1_5_VERSION) {
4694 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4695 p = skip_over_field_name(bytes, true, length);
4696 legal = (p != nullptr) && ((p - bytes) == (int)length);
4697 }
4698 } else {
4699 // 4900761: relax the constraints based on JSR202 spec
4700 // Class names may be drawn from the entire Unicode character set.
4701 // Identifiers between '/' must be unqualified names.
4702 // The utf8 string has been verified when parsing cpool entries.
4703 legal = verify_unqualified_name(bytes, length, LegalClass);
4704 }
4705 }
4706 if (!legal) {
4707 ResourceMark rm(THREAD);
4708 assert(_class_name != nullptr, "invariant");
4709 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4710 Exceptions::fthrow(
4711 THREAD_AND_LOCATION,
4712 vmSymbols::java_lang_ClassFormatError(),
4713 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4714 _class_name->as_C_string()
4715 );
4716 return;
4717 }
4745 THREAD_AND_LOCATION,
4746 vmSymbols::java_lang_ClassFormatError(),
4747 "Illegal field name \"%.*s\" in class %s", length, bytes,
4748 _class_name->as_C_string()
4749 );
4750 return;
4751 }
4752 }
4753
4754 // Checks if name is a legal method name.
4755 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4756 if (!_need_verify) { return; }
4757
4758 assert(name != nullptr, "method name is null");
4759 char* bytes = (char*)name->bytes();
4760 unsigned int length = name->utf8_length();
4761 bool legal = false;
4762
4763 if (length > 0) {
4764 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4765 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4766 legal = true;
4767 }
4768 } else if (_major_version < JAVA_1_5_VERSION) {
4769 const char* p;
4770 p = skip_over_field_name(bytes, false, length);
4771 legal = (p != nullptr) && ((p - bytes) == (int)length);
4772 } else {
4773 // 4881221: relax the constraints based on JSR202 spec
4774 legal = verify_unqualified_name(bytes, length, LegalMethod);
4775 }
4776 }
4777
4778 if (!legal) {
4779 ResourceMark rm(THREAD);
4780 assert(_class_name != nullptr, "invariant");
4781 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4782 Exceptions::fthrow(
4783 THREAD_AND_LOCATION,
4784 vmSymbols::java_lang_ClassFormatError(),
4785 "Illegal method name \"%.*s\" in class %s", length, bytes,
4786 _class_name->as_C_string()
4787 );
4788 return;
4789 }
4790 }
4791
4792
4793 // Checks if signature is a legal field signature.
4794 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4795 const Symbol* signature,
4796 TRAPS) const {
4797 if (!_need_verify) { return; }
4798
4799 const char* const bytes = (const char*)signature->bytes();
4800 const unsigned int length = signature->utf8_length();
4801 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4802
4803 if (p == nullptr || (p - bytes) != (int)length) {
4804 throwIllegalSignature("Field", name, signature, CHECK);
4805 }
4806 }
4807
4808 // Check that the signature is compatible with the method name. For example,
4809 // check that <init> has a void signature.
4810 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4811 const Symbol* signature,
4812 TRAPS) const {
4813 if (!_need_verify) {
4814 return;
4815 }
4816
4817 // Class initializers cannot have args for class format version >= 51.
4818 if (name == vmSymbols::class_initializer_name() &&
4819 signature != vmSymbols::void_method_signature() &&
4820 _major_version >= JAVA_7_VERSION) {
4821 throwIllegalSignature("Method", name, signature, THREAD);
4822 return;
4823 }
4824
4825 int sig_length = signature->utf8_length();
4826 if (name->utf8_length() > 0 &&
4827 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4828 sig_length > 0 &&
4829 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4830 throwIllegalSignature("Method", name, signature, THREAD);
4831 }
4832 }
4833
4834 // Checks if signature is a legal method signature.
4835 // Returns number of parameters
4836 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
4837 const Symbol* signature,
4838 TRAPS) const {
4839 if (!_need_verify) {
4840 // make sure caller's args_size will be less than 0 even for non-static
4841 // method so it will be recomputed in compute_size_of_parameters().
4842 return -2;
4843 }
4844
4845 unsigned int args_size = 0;
4846 const char* p = (const char*)signature->bytes();
4847 unsigned int length = signature->utf8_length();
4848 const char* nextp;
4849
4860 length -= pointer_delta_as_int(nextp, p);
4861 p = nextp;
4862 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4863 }
4864 // The first non-signature thing better be a ')'
4865 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4866 length--;
4867 // Now we better just have a return value
4868 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4869 if (nextp && ((int)length == (nextp - p))) {
4870 return args_size;
4871 }
4872 }
4873 }
4874 // Report error
4875 throwIllegalSignature("Method", name, signature, THREAD);
4876 return 0;
4877 }
4878
4879 int ClassFileParser::static_field_size() const {
4880 assert(_field_info != nullptr, "invariant");
4881 return _field_info->_static_field_size;
4882 }
4883
4884 int ClassFileParser::total_oop_map_count() const {
4885 assert(_field_info != nullptr, "invariant");
4886 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4887 }
4888
4889 jint ClassFileParser::layout_size() const {
4890 assert(_field_info != nullptr, "invariant");
4891 return _field_info->_instance_size;
4892 }
4893
4894 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4895 const Array<Method*>* methods) {
4896 assert(ik != nullptr, "invariant");
4897 assert(methods != nullptr, "invariant");
4898
4899 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4900 // (We used to do this lazily, but now we query it in Rewriter,
4901 // which is eagerly done for every method, so we might as well do it now,
4902 // when everything is fresh in memory.)
4903 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4904
4905 if (klass_id != vmSymbolID::NO_SID) {
4906 for (int j = 0; j < methods->length(); ++j) {
4907 Method* method = methods->at(j);
4908 method->init_intrinsic_id(klass_id);
4909
4910 if (CheckIntrinsics) {
4911 // Check if an intrinsic is defined for method 'method',
4986 }
4987 }
4988
4989 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
4990 const ClassInstanceInfo& cl_inst_info,
4991 TRAPS) {
4992 if (_klass != nullptr) {
4993 return _klass;
4994 }
4995
4996 InstanceKlass* const ik =
4997 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
4998
4999 if (is_hidden()) {
5000 mangle_hidden_class_name(ik);
5001 }
5002
5003 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5004
5005 assert(_klass == ik, "invariant");
5006
5007 return ik;
5008 }
5009
5010 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5011 bool changed_by_loadhook,
5012 const ClassInstanceInfo& cl_inst_info,
5013 TRAPS) {
5014 assert(ik != nullptr, "invariant");
5015
5016 // Set name and CLD before adding to CLD
5017 ik->set_class_loader_data(_loader_data);
5018 ik->set_name(_class_name);
5019
5020 // Add all classes to our internal class loader list here,
5021 // including classes in the bootstrap (null) class loader.
5022 const bool publicize = !is_internal();
5023
5024 _loader_data->add_class(ik, publicize);
5025
5026 set_klass_to_deallocate(ik);
5027
5028 assert(_field_info != nullptr, "invariant");
5029 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5030 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5031 "sanity");
5032
5033 assert(ik->is_instance_klass(), "sanity");
5034 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5035
5036 // Fill in information already parsed
5037 ik->set_should_verify_class(_need_verify);
5038
5039 // Not yet: supers are done below to support the new subtype-checking fields
5040 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5041 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5042 ik->set_static_oop_field_count(_static_oop_count);
5043
5044 // this transfers ownership of a lot of arrays from
5045 // the parser onto the InstanceKlass*
5046 apply_parsed_class_metadata(ik, _java_fields_count);
5047
5048 // can only set dynamic nest-host after static nest information is set
5049 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5050 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5051 }
5052
5053 // note that is not safe to use the fields in the parser from this point on
5054 assert(nullptr == _cp, "invariant");
5055 assert(nullptr == _fieldinfo_stream, "invariant");
5056 assert(nullptr == _fields_status, "invariant");
5057 assert(nullptr == _methods, "invariant");
5058 assert(nullptr == _inner_classes, "invariant");
5059 assert(nullptr == _nest_members, "invariant");
5060 assert(nullptr == _combined_annotations, "invariant");
5061 assert(nullptr == _record_components, "invariant");
5062 assert(nullptr == _permitted_subclasses, "invariant");
5063
5064 if (_has_localvariable_table) {
5065 ik->set_has_localvariable_table(true);
5066 }
5067
5068 if (_has_final_method) {
5069 ik->set_has_final_method();
5070 }
5071
5072 ik->copy_method_ordering(_method_ordering, CHECK);
5073 // The InstanceKlass::_methods_jmethod_ids cache
5074 // is managed on the assumption that the initial cache
5075 // size is equal to the number of methods in the class. If
5076 // that changes, then InstanceKlass::idnum_can_increment()
5077 // has to be changed accordingly.
5078 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5079
5080 ik->set_this_class_index(_this_class_index);
5081
5082 if (_is_hidden) {
5120 if ((_num_miranda_methods > 0) ||
5121 // if this class introduced new miranda methods or
5122 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5123 // super class exists and this class inherited miranda methods
5124 ) {
5125 ik->set_has_miranda_methods(); // then set a flag
5126 }
5127
5128 // Fill in information needed to compute superclasses.
5129 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5130 ik->set_transitive_interfaces(_transitive_interfaces);
5131 ik->set_local_interfaces(_local_interfaces);
5132 _transitive_interfaces = nullptr;
5133 _local_interfaces = nullptr;
5134
5135 // Initialize itable offset tables
5136 klassItable::setup_itable_offset_table(ik);
5137
5138 // Compute transitive closure of interfaces this class implements
5139 // Do final class setup
5140 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5141 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5142 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5143 }
5144
5145 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5146 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5147 ik->set_has_contended_annotations(true);
5148 }
5149
5150 // Fill in has_finalizer and layout_helper
5151 set_precomputed_flags(ik);
5152
5153 // check if this class can access its super class
5154 check_super_class_access(ik, CHECK);
5155
5156 // check if this class can access its superinterfaces
5157 check_super_interface_access(ik, CHECK);
5158
5159 // check if this class overrides any final method
5160 check_final_method_override(ik, CHECK);
5181
5182 assert(_all_mirandas != nullptr, "invariant");
5183
5184 // Generate any default methods - default methods are public interface methods
5185 // that have a default implementation. This is new with Java 8.
5186 if (_has_nonstatic_concrete_methods) {
5187 DefaultMethods::generate_default_methods(ik,
5188 _all_mirandas,
5189 CHECK);
5190 }
5191
5192 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5193 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5194 !module_entry->has_default_read_edges()) {
5195 if (!module_entry->set_has_default_read_edges()) {
5196 // We won a potential race
5197 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5198 }
5199 }
5200
5201 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5202
5203 if (!is_internal()) {
5204 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5205
5206 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5207 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5208 log_is_enabled(Info, class, preview)) {
5209 ResourceMark rm;
5210 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5211 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5212 }
5213
5214 if (log_is_enabled(Debug, class, resolve)) {
5215 ResourceMark rm;
5216 // print out the superclass.
5217 const char * from = ik->external_name();
5218 if (ik->java_super() != nullptr) {
5219 log_debug(class, resolve)("%s %s (super)",
5220 from,
5262 ClassLoaderData* loader_data,
5263 const ClassLoadInfo* cl_info,
5264 Publicity pub_level,
5265 TRAPS) :
5266 _stream(stream),
5267 _class_name(nullptr),
5268 _loader_data(loader_data),
5269 _is_hidden(cl_info->is_hidden()),
5270 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5271 _orig_cp_size(0),
5272 _static_oop_count(0),
5273 _super_klass(),
5274 _cp(nullptr),
5275 _fieldinfo_stream(nullptr),
5276 _fields_status(nullptr),
5277 _methods(nullptr),
5278 _inner_classes(nullptr),
5279 _nest_members(nullptr),
5280 _nest_host(0),
5281 _permitted_subclasses(nullptr),
5282 _record_components(nullptr),
5283 _local_interfaces(nullptr),
5284 _transitive_interfaces(nullptr),
5285 _combined_annotations(nullptr),
5286 _class_annotations(nullptr),
5287 _class_type_annotations(nullptr),
5288 _fields_annotations(nullptr),
5289 _fields_type_annotations(nullptr),
5290 _klass(nullptr),
5291 _klass_to_deallocate(nullptr),
5292 _parsed_annotations(nullptr),
5293 _field_info(nullptr),
5294 _temp_field_info(nullptr),
5295 _method_ordering(nullptr),
5296 _all_mirandas(nullptr),
5297 _vtable_size(0),
5298 _itable_size(0),
5299 _num_miranda_methods(0),
5300 _protection_domain(cl_info->protection_domain()),
5301 _access_flags(),
5302 _pub_level(pub_level),
5303 _bad_constant_seen(0),
5304 _synthetic_flag(false),
5305 _sde_length(false),
5306 _sde_buffer(nullptr),
5307 _sourcefile_index(0),
5308 _generic_signature_index(0),
5309 _major_version(0),
5310 _minor_version(0),
5311 _this_class_index(0),
5312 _super_class_index(0),
5313 _itfs_len(0),
5314 _java_fields_count(0),
5315 _need_verify(false),
5316 _has_nonstatic_concrete_methods(false),
5317 _declares_nonstatic_concrete_methods(false),
5318 _has_localvariable_table(false),
5319 _has_final_method(false),
5320 _has_contended_fields(false),
5321 _has_finalizer(false),
5322 _has_empty_finalizer(false),
5323 _max_bootstrap_specifier_index(-1) {
5324
5325 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5326 _class_name->increment_refcount();
5327
5328 assert(_loader_data != nullptr, "invariant");
5329 assert(stream != nullptr, "invariant");
5330 assert(_stream != nullptr, "invariant");
5331 assert(_stream->buffer() == _stream->current(), "invariant");
5332 assert(_class_name != nullptr, "invariant");
5333 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5334
5335 // Figure out whether we can skip format checking (matching classic VM behavior)
5336 // Always verify CFLH bytes from the user agents.
5337 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5338
5339 // synch back verification state to stream to check for truncation.
5340 stream->set_need_verify(_need_verify);
5341
5342 parse_stream(stream, CHECK);
5343
5344 post_process_parsed_stream(stream, _cp, CHECK);
5345 }
5346
5347 void ClassFileParser::clear_class_metadata() {
5348 // metadata created before the instance klass is created. Must be
5349 // deallocated if classfile parsing returns an error.
5350 _cp = nullptr;
5351 _fieldinfo_stream = nullptr;
5352 _fields_status = nullptr;
5353 _methods = nullptr;
5354 _inner_classes = nullptr;
5355 _nest_members = nullptr;
5356 _permitted_subclasses = nullptr;
5357 _combined_annotations = nullptr;
5358 _class_annotations = _class_type_annotations = nullptr;
5359 _fields_annotations = _fields_type_annotations = nullptr;
5360 _record_components = nullptr;
5361 }
5362
5363 // Destructor to clean up
5364 ClassFileParser::~ClassFileParser() {
5365 _class_name->decrement_refcount();
5366
5367 if (_cp != nullptr) {
5368 MetadataFactory::free_metadata(_loader_data, _cp);
5369 }
5370
5371 if (_fieldinfo_stream != nullptr) {
5372 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5373 }
5374
5375 if (_fields_status != nullptr) {
5376 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5377 }
5378
5379 if (_methods != nullptr) {
5380 // Free methods
5381 InstanceKlass::deallocate_methods(_loader_data, _methods);
5382 }
5383
5384 // beware of the Universe::empty_blah_array!!
5385 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5386 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5387 }
5388
5389 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5390 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5391 }
5392
5393 if (_record_components != nullptr) {
5394 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5395 }
5396
5397 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5398 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5399 }
5400
5401 // Free interfaces
5402 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5403 _local_interfaces, _transitive_interfaces);
5404
5405 if (_combined_annotations != nullptr) {
5406 // After all annotations arrays have been created, they are installed into the
5407 // Annotations object that will be assigned to the InstanceKlass being created.
5408
5409 // Deallocate the Annotations object and the installed annotations arrays.
5410 _combined_annotations->deallocate_contents(_loader_data);
5411
5412 // If the _combined_annotations pointer is non-null,
5413 // then the other annotations fields should have been cleared.
5414 assert(_class_annotations == nullptr, "Should have been cleared");
5415 assert(_class_type_annotations == nullptr, "Should have been cleared");
5416 assert(_fields_annotations == nullptr, "Should have been cleared");
5417 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5418 } else {
5419 // If the annotations arrays were not installed into the Annotations object,
5420 // then they have to be deallocated explicitly.
5465 cp_size, CHECK);
5466
5467 _orig_cp_size = cp_size;
5468 if (is_hidden()) { // Add a slot for hidden class name.
5469 cp_size++;
5470 }
5471
5472 _cp = ConstantPool::allocate(_loader_data,
5473 cp_size,
5474 CHECK);
5475
5476 ConstantPool* const cp = _cp;
5477
5478 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5479
5480 assert(cp_size == (u2)cp->length(), "invariant");
5481
5482 // ACCESS FLAGS
5483 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5484
5485 // Access flags
5486 u2 flags;
5487 // JVM_ACC_MODULE is defined in JDK-9 and later.
5488 if (_major_version >= JAVA_9_VERSION) {
5489 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5490 } else {
5491 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5492 }
5493
5494 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5495 // Set abstract bit for old class files for backward compatibility
5496 flags |= JVM_ACC_ABSTRACT;
5497 }
5498
5499 verify_legal_class_modifiers(flags, CHECK);
5500
5501 short bad_constant = class_bad_constant_seen();
5502 if (bad_constant != 0) {
5503 // Do not throw CFE until after the access_flags are checked because if
5504 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5505 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5506 return;
5507 }
5508
5509 _access_flags.set_flags(flags);
5510
5511 // This class and superclass
5512 _this_class_index = stream->get_u2_fast();
5513 guarantee_property(
5514 valid_cp_range(_this_class_index, cp_size) &&
5515 cp->tag_at(_this_class_index).is_unresolved_klass(),
5516 "Invalid this class index %u in constant pool in class file %s",
5517 _this_class_index, CHECK);
5518
5519 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5520 assert(class_name_in_cp != nullptr, "class_name can't be null");
5521
5522 // Don't need to check whether this class name is legal or not.
5523 // It has been checked when constant pool is parsed.
5524 // However, make sure it is not an array type.
5525 if (_need_verify) {
5526 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5527 "Bad class name in class file %s",
5528 CHECK);
5529 }
5530
5531 #ifdef ASSERT
5532 // Basic sanity checks
5533 if (_is_hidden) {
5534 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5535 }
5536 #endif
5537
5538 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5539
5540 if (_is_hidden) {
5541 assert(_class_name != nullptr, "Unexpected null _class_name");
5582 }
5583 ls.cr();
5584 }
5585 }
5586
5587 // SUPERKLASS
5588 _super_class_index = stream->get_u2_fast();
5589 _super_klass = parse_super_class(cp,
5590 _super_class_index,
5591 _need_verify,
5592 CHECK);
5593
5594 // Interfaces
5595 _itfs_len = stream->get_u2_fast();
5596 parse_interfaces(stream,
5597 _itfs_len,
5598 cp,
5599 &_has_nonstatic_concrete_methods,
5600 CHECK);
5601
5602 assert(_local_interfaces != nullptr, "invariant");
5603
5604 // Fields (offsets are filled in later)
5605 parse_fields(stream,
5606 _access_flags.is_interface(),
5607 cp,
5608 cp_size,
5609 &_java_fields_count,
5610 CHECK);
5611
5612 assert(_temp_field_info != nullptr, "invariant");
5613
5614 // Methods
5615 parse_methods(stream,
5616 _access_flags.is_interface(),
5617 &_has_localvariable_table,
5618 &_has_final_method,
5619 &_declares_nonstatic_concrete_methods,
5620 CHECK);
5621
5622 assert(_methods != nullptr, "invariant");
5623
5624 if (_declares_nonstatic_concrete_methods) {
5625 _has_nonstatic_concrete_methods = true;
5626 }
5627
5628 // Additional attributes/annotations
5629 _parsed_annotations = new ClassAnnotationCollector();
5630 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5631
5632 assert(_inner_classes != nullptr, "invariant");
5633
5634 // Finalize the Annotations metadata object,
5635 // now that all annotation arrays have been created.
5636 create_combined_annotations(CHECK);
5676 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5677 // We have to update the resolved_klass_index and the name_index together
5678 // so extract the existing resolved_klass_index first.
5679 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5680 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5681 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5682 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5683 "Bad name_index");
5684 }
5685
5686 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5687 ConstantPool* cp,
5688 TRAPS) {
5689 assert(stream != nullptr, "invariant");
5690 assert(stream->at_eos(), "invariant");
5691 assert(cp != nullptr, "invariant");
5692 assert(_loader_data != nullptr, "invariant");
5693
5694 if (_class_name == vmSymbols::java_lang_Object()) {
5695 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5696 "java.lang.Object cannot implement an interface in class file %s",
5697 CHECK);
5698 }
5699 // We check super class after class file is parsed and format is checked
5700 if (_super_class_index > 0 && nullptr == _super_klass) {
5701 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5702 if (_access_flags.is_interface()) {
5703 // Before attempting to resolve the superclass, check for class format
5704 // errors not checked yet.
5705 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5706 "Interfaces must have java.lang.Object as superclass in class file %s",
5707 CHECK);
5708 }
5709 Handle loader(THREAD, _loader_data->class_loader());
5710 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5711 _super_klass = vmClasses::Object_klass();
5712 } else {
5713 _super_klass = (const InstanceKlass*)
5714 SystemDictionary::resolve_super_or_fail(_class_name,
5715 super_class_name,
5716 loader,
5717 true,
5718 CHECK);
5719 }
5720 }
5721
5722 if (_super_klass != nullptr) {
5723 if (_super_klass->has_nonstatic_concrete_methods()) {
5724 _has_nonstatic_concrete_methods = true;
5725 }
5726
5727 if (_super_klass->is_interface()) {
5728 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5729 return;
5730 }
5731 }
5732
5733 // Compute the transitive list of all unique interfaces implemented by this class
5734 _transitive_interfaces =
5735 compute_transitive_interfaces(_super_klass,
5736 _local_interfaces,
5737 _loader_data,
5738 CHECK);
5739
5740 assert(_transitive_interfaces != nullptr, "invariant");
5741
5742 // sort methods
5743 _method_ordering = sort_methods(_methods);
5744
5745 _all_mirandas = new GrowableArray<Method*>(20);
5746
5747 Handle loader(THREAD, _loader_data->class_loader());
5748 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5749 &_num_miranda_methods,
5750 _all_mirandas,
5751 _super_klass,
5752 _methods,
5753 _access_flags,
5754 _major_version,
5755 loader,
5756 _class_name,
5757 _local_interfaces);
5758
5759 // Size of Java itable (in words)
5760 _itable_size = _access_flags.is_interface() ? 0 :
5761 klassItable::compute_itable_size(_transitive_interfaces);
5762
5763 assert(_parsed_annotations != nullptr, "invariant");
5764
5765 _field_info = new FieldLayoutInfo();
5766 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5767 _parsed_annotations->is_contended(), _field_info);
5768 lb.build_layout();
5769
5770 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5771 _fieldinfo_stream =
5772 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5773 injected_fields_count, loader_data(), CHECK);
5774 _fields_status =
5775 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5776 FieldStatus(0), CHECK);
5777 }
5778
5779 void ClassFileParser::set_klass(InstanceKlass* klass) {
5780
5781 #ifdef ASSERT
5782 if (klass != nullptr) {
5783 assert(nullptr == _klass, "leaking?");
5784 }
5785 #endif
5786
5787 _klass = klass;
5788 }
5789
5790 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5791
5792 #ifdef ASSERT
5793 if (klass != nullptr) {
5794 assert(nullptr == _klass_to_deallocate, "leaking?");
5795 }
5796 #endif
|
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "oops/inlineKlass.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoadInfo.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.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/formatBuffer.hpp"
84 #include "utilities/exceptions.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/resourceHash.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95 #if INCLUDE_JFR
96 #include "jfr/support/jfrTraceIdExtension.hpp"
97 #endif
98
99 // We generally try to create the oops directly when parsing, rather than
100 // allocating temporary data structures and copying the bytes twice. A
101 // temporary area is only needed when parsing utf8 entries in the constant
102 // pool and when parsing line number tables.
103
104 // We add assert in debug mode when class format is not checked.
105
106 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
107 #define JAVA_MIN_SUPPORTED_VERSION 45
108 #define JAVA_PREVIEW_MINOR_VERSION 65535
109
110 // Used for two backward compatibility reasons:
137 #define JAVA_14_VERSION 58
138
139 #define JAVA_15_VERSION 59
140
141 #define JAVA_16_VERSION 60
142
143 #define JAVA_17_VERSION 61
144
145 #define JAVA_18_VERSION 62
146
147 #define JAVA_19_VERSION 63
148
149 #define JAVA_20_VERSION 64
150
151 #define JAVA_21_VERSION 65
152
153 #define JAVA_22_VERSION 66
154
155 #define JAVA_23_VERSION 67
156
157 #define CONSTANT_CLASS_DESCRIPTORS 69
158
159 #define JAVA_24_VERSION 68
160
161 #define JAVA_25_VERSION 69
162
163 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
164 assert((bad_constant == JVM_CONSTANT_Module ||
165 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
166 "Unexpected bad constant pool entry");
167 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
168 }
169
170 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
171 ConstantPool* cp,
172 const int length,
173 TRAPS) {
174 assert(stream != nullptr, "invariant");
175 assert(cp != nullptr, "invariant");
176
177 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
178 // this function (_current can be allocated in a register, with scalar
181 // this method that uses stream().
182 const ClassFileStream cfs1 = *stream;
183 const ClassFileStream* const cfs = &cfs1;
184
185 DEBUG_ONLY(const u1* const old_current = stream->current();)
186
187 // Used for batching symbol allocations.
188 const char* names[SymbolTable::symbol_alloc_batch_size];
189 int lengths[SymbolTable::symbol_alloc_batch_size];
190 int indices[SymbolTable::symbol_alloc_batch_size];
191 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
192 int names_count = 0;
193
194 // parsing Index 0 is unused
195 for (int index = 1; index < length; index++) {
196 // Each of the following case guarantees one more byte in the stream
197 // for the following tag or the access_flags following constant pool,
198 // so we don't need bounds-check for reading tag.
199 const u1 tag = cfs->get_u1_fast();
200 switch (tag) {
201 case JVM_CONSTANT_Class: {
202 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
203 const u2 name_index = cfs->get_u2_fast();
204 cp->klass_index_at_put(index, name_index);
205 break;
206 }
207 case JVM_CONSTANT_Fieldref: {
208 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
209 const u2 class_index = cfs->get_u2_fast();
210 const u2 name_and_type_index = cfs->get_u2_fast();
211 cp->field_at_put(index, class_index, name_and_type_index);
212 break;
213 }
214 case JVM_CONSTANT_Methodref: {
215 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
216 const u2 class_index = cfs->get_u2_fast();
217 const u2 name_and_type_index = cfs->get_u2_fast();
218 cp->method_at_put(index, class_index, name_and_type_index);
219 break;
220 }
221 case JVM_CONSTANT_InterfaceMethodref: {
485 guarantee_property(valid_symbol_at(name_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 name_ref_index, CHECK);
488 guarantee_property(valid_symbol_at(signature_ref_index),
489 "Invalid constant pool index %u in class file %s",
490 signature_ref_index, CHECK);
491 break;
492 }
493 case JVM_CONSTANT_Utf8:
494 break;
495 case JVM_CONSTANT_UnresolvedClass: // fall-through
496 case JVM_CONSTANT_UnresolvedClassInError: {
497 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
498 break;
499 }
500 case JVM_CONSTANT_ClassIndex: {
501 const int class_index = cp->klass_index_at(index);
502 guarantee_property(valid_symbol_at(class_index),
503 "Invalid constant pool index %u in class file %s",
504 class_index, CHECK);
505
506 Symbol* const name = cp->symbol_at(class_index);
507 const unsigned int name_len = name->utf8_length();
508 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
509 break;
510 }
511 case JVM_CONSTANT_StringIndex: {
512 const int string_index = cp->string_index_at(index);
513 guarantee_property(valid_symbol_at(string_index),
514 "Invalid constant pool index %u in class file %s",
515 string_index, CHECK);
516 Symbol* const sym = cp->symbol_at(string_index);
517 cp->unresolved_string_at_put(index, sym);
518 break;
519 }
520 case JVM_CONSTANT_MethodHandle: {
521 const int ref_index = cp->method_handle_index_at(index);
522 guarantee_property(valid_cp_range(ref_index, length),
523 "Invalid constant pool index %u in class file %s",
524 ref_index, CHECK);
525 const constantTag tag = cp->tag_at(ref_index);
526 const int ref_kind = cp->method_handle_ref_kind_at(index);
527
697 }
698 }
699 } else {
700 if (_need_verify) {
701 // Method name and signature are individually verified above, when iterating
702 // NameAndType_info. Need to check here that signature is non-zero length and
703 // the right type.
704 if (!Signature::is_method(signature)) {
705 throwIllegalSignature("Method", name, signature, CHECK);
706 }
707 }
708 // If a class method name begins with '<', it must be "<init>" and have void signature.
709 const unsigned int name_len = name->utf8_length();
710 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
711 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
712 if (name != vmSymbols::object_initializer_name()) {
713 classfile_parse_error(
714 "Bad method name at constant pool index %u in class file %s",
715 name_ref_index, THREAD);
716 return;
717 } else if (!Signature::is_void_method(signature)) { // must have void signature.
718 throwIllegalSignature("Method", name, signature, CHECK);
719 }
720 }
721 }
722 break;
723 }
724 case JVM_CONSTANT_MethodHandle: {
725 const int ref_index = cp->method_handle_index_at(index);
726 const int ref_kind = cp->method_handle_ref_kind_at(index);
727 switch (ref_kind) {
728 case JVM_REF_invokeVirtual:
729 case JVM_REF_invokeStatic:
730 case JVM_REF_invokeSpecial:
731 case JVM_REF_newInvokeSpecial: {
732 const int name_and_type_ref_index =
733 cp->uncached_name_and_type_ref_index_at(ref_index);
734 const int name_ref_index =
735 cp->name_ref_index_at(name_and_type_ref_index);
736 const Symbol* const name = cp->symbol_at(name_ref_index);
737
738 if (name != vmSymbols::object_initializer_name()) { // !<init>
739 if (ref_kind == JVM_REF_newInvokeSpecial) {
740 classfile_parse_error(
741 "Bad constructor name at constant pool index %u in class file %s",
742 name_ref_index, THREAD);
743 return;
744 }
745 } else { // <init>
746 // The allowed invocation mode of <init> depends on its signature.
747 // This test corresponds to verify_invoke_instructions in the verifier.
748 const int signature_ref_index =
749 cp->signature_ref_index_at(name_and_type_ref_index);
750 const Symbol* const signature = cp->symbol_at(signature_ref_index);
751 if (signature->is_void_method_signature()
752 && ref_kind == JVM_REF_newInvokeSpecial) {
753 // OK, could be a constructor call
754 } else {
755 classfile_parse_error(
756 "Bad method name at constant pool index %u in class file %s",
757 name_ref_index, THREAD);
758 return;
759 }
760 }
761 break;
762 }
763 // Other ref_kinds are already fully checked in previous pass.
764 } // switch(ref_kind)
765 break;
766 }
767 case JVM_CONSTANT_MethodType: {
768 const Symbol* const no_name = vmSymbols::type_name(); // place holder
769 const Symbol* const signature = cp->method_type_signature_at(index);
770 verify_legal_method_signature(no_name, signature, CHECK);
771 break;
772 }
773 case JVM_CONSTANT_Utf8: {
774 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
786
787 NameSigHash(Symbol* name, Symbol* sig) :
788 _name(name),
789 _sig(sig) {}
790
791 static unsigned int hash(NameSigHash const& namesig) {
792 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
793 }
794
795 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
796 return (e0._name == e1._name) &&
797 (e0._sig == e1._sig);
798 }
799 };
800
801 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
802 NameSigHash::HASH_ROW_SIZE,
803 AnyObj::RESOURCE_AREA, mtInternal,
804 &NameSigHash::hash, &NameSigHash::equals>;
805
806 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
807 assert(super_type != nullptr,"Method doesn't support null super type");
808 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
809 && super_type->name() != vmSymbols::java_lang_Object()) {
810 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
811 err_msg("Value type %s has an identity type as supertype",
812 current->class_name()->as_klass_external_name()));
813 }
814 }
815
816 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
817 int itfs_len,
818 ConstantPool* cp,
819 bool* const has_nonstatic_concrete_methods,
820 // FIXME: lots of these functions
821 // declare their parameters as const,
822 // which adds only noise to the code.
823 // Remove the spurious const modifiers.
824 // Many are of the form "const int x"
825 // or "T* const x".
826 TRAPS) {
827 assert(stream != nullptr, "invariant");
828 assert(cp != nullptr, "invariant");
829 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
830
831 if (itfs_len == 0) {
832 _local_interfaces = Universe::the_empty_instance_klass_array();
833
834 } else {
835 assert(itfs_len > 0, "only called for len>0");
836 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
837 int index = 0;
838 for (index = 0; index < itfs_len; index++) {
839 const u2 interface_index = stream->get_u2(CHECK);
840 guarantee_property(
841 valid_klass_reference_at(interface_index),
842 "Interface name has bad constant pool index %u in class file %s",
843 interface_index, CHECK);
844 _local_interface_indexes->at_put_grow(index, interface_index);
845 }
846
847 if (!_need_verify || itfs_len <= 1) {
848 return;
849 }
850
851 // Check if there's any duplicates in interfaces
852 ResourceMark rm(THREAD);
853 // Set containing interface names
854 ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
855 for (index = 0; index < itfs_len; index++) {
856 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
857 // If no duplicates, add (name, nullptr) in hashtable interface_names.
858 if (!interface_names->put(interface_name, 0)) {
859 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
860 interface_name->as_C_string(), THREAD);
861 return;
862 }
863 }
864 }
865 }
866
867 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
868 int constantvalue_index,
869 int signature_index,
870 TRAPS) const {
871 // Make sure the constant pool entry is of a type appropriate to this field
872 guarantee_property(
873 (constantvalue_index > 0 &&
874 constantvalue_index < cp->length()),
875 "Bad initial value index %u in ConstantValue attribute in class file %s",
876 constantvalue_index, CHECK);
923 class AnnotationCollector : public ResourceObj{
924 public:
925 enum Location { _in_field, _in_method, _in_class };
926 enum ID {
927 _unknown = 0,
928 _method_CallerSensitive,
929 _method_ForceInline,
930 _method_DontInline,
931 _method_ChangesCurrentThread,
932 _method_JvmtiHideEvents,
933 _method_JvmtiMountTransition,
934 _method_InjectedProfile,
935 _method_LambdaForm_Compiled,
936 _method_Hidden,
937 _method_Scoped,
938 _method_IntrinsicCandidate,
939 _jdk_internal_vm_annotation_Contended,
940 _field_Stable,
941 _jdk_internal_vm_annotation_ReservedStackAccess,
942 _jdk_internal_ValueBased,
943 _jdk_internal_LooselyConsistentValue,
944 _jdk_internal_NullRestricted,
945 _java_lang_Deprecated,
946 _java_lang_Deprecated_for_removal,
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) {
962 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
963 _annotations_present |= (int)nth_bit((int)id);
964 }
1347 }
1348
1349 *constantvalue_index_addr = constantvalue_index;
1350 *is_synthetic_addr = is_synthetic;
1351 *generic_signature_index_addr = generic_signature_index;
1352 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1353 runtime_visible_annotations_length,
1354 CHECK);
1355 parsed_annotations->set_field_annotations(a);
1356 a = allocate_annotations(runtime_visible_type_annotations,
1357 runtime_visible_type_annotations_length,
1358 CHECK);
1359 parsed_annotations->set_field_type_annotations(a);
1360 return;
1361 }
1362
1363
1364 // Side-effects: populates the _fields, _fields_annotations,
1365 // _fields_type_annotations fields
1366 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1367 AccessFlags class_access_flags,
1368 ConstantPool* cp,
1369 const int cp_size,
1370 u2* const java_fields_count_ptr,
1371 TRAPS) {
1372
1373 assert(cfs != nullptr, "invariant");
1374 assert(cp != nullptr, "invariant");
1375 assert(java_fields_count_ptr != nullptr, "invariant");
1376
1377 assert(nullptr == _fields_annotations, "invariant");
1378 assert(nullptr == _fields_type_annotations, "invariant");
1379
1380 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1381 cfs->guarantee_more(2, CHECK); // length
1382 const u2 length = cfs->get_u2_fast();
1383 *java_fields_count_ptr = length;
1384
1385 int num_injected = 0;
1386 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1387 &num_injected);
1388
1389 // two more slots are required for inline classes:
1390 // one for the static field with a reference to the pre-allocated default value
1391 // one for the field the JVM injects when detecting an empty inline class
1392 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1393
1394 // Allocate a temporary resource array to collect field data.
1395 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1396 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1397
1398 int instance_fields_count = 0;
1399 ResourceMark rm(THREAD);
1400 for (int n = 0; n < length; n++) {
1401 // access_flags, name_index, descriptor_index, attributes_count
1402 cfs->guarantee_more(8, CHECK);
1403
1404 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1405 if (!supports_inline_types()) {
1406 recognized_modifiers &= ~JVM_ACC_STRICT;
1407 }
1408
1409 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1410 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1411 AccessFlags access_flags;
1412 access_flags.set_flags(flags);
1413 FieldInfo::FieldFlags fieldFlags(0);
1414
1415 const u2 name_index = cfs->get_u2_fast();
1416 guarantee_property(valid_symbol_at(name_index),
1417 "Invalid constant pool index %u for field name in class file %s",
1418 name_index, CHECK);
1419 const Symbol* const name = cp->symbol_at(name_index);
1420 verify_legal_field_name(name, CHECK);
1421
1422 const u2 signature_index = cfs->get_u2_fast();
1423 guarantee_property(valid_symbol_at(signature_index),
1424 "Invalid constant pool index %u for field signature in class file %s",
1425 signature_index, CHECK);
1426 const Symbol* const sig = cp->symbol_at(signature_index);
1427 verify_legal_field_signature(name, sig, CHECK);
1428 if (!access_flags.is_static()) instance_fields_count++;
1429
1430 u2 constantvalue_index = 0;
1431 bool is_synthetic = false;
1432 u2 generic_signature_index = 0;
1433 const bool is_static = access_flags.is_static();
1434 FieldAnnotationCollector parsed_annotations(_loader_data);
1435
1436 bool is_null_restricted = false;
1437
1438 const u2 attributes_count = cfs->get_u2_fast();
1439 if (attributes_count > 0) {
1440 parse_field_attributes(cfs,
1441 attributes_count,
1442 is_static,
1443 signature_index,
1444 &constantvalue_index,
1445 &is_synthetic,
1446 &generic_signature_index,
1447 &parsed_annotations,
1448 CHECK);
1449
1450 if (parsed_annotations.field_annotations() != nullptr) {
1451 if (_fields_annotations == nullptr) {
1452 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1453 _loader_data, length, nullptr,
1454 CHECK);
1455 }
1456 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1457 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1458 if (!Signature::has_envelope(sig)) {
1459 Exceptions::fthrow(
1460 THREAD_AND_LOCATION,
1461 vmSymbols::java_lang_ClassFormatError(),
1462 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1463 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1464 }
1465 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
1466 if (!is_strict) {
1467 Exceptions::fthrow(
1468 THREAD_AND_LOCATION,
1469 vmSymbols::java_lang_ClassFormatError(),
1470 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s which doesn't have the @jdk.internal.vm.annotation.Strict annotation",
1471 class_name()->as_C_string(), name->as_C_string());
1472 }
1473 is_null_restricted = true;
1474 }
1475 parsed_annotations.set_field_annotations(nullptr);
1476 }
1477 if (parsed_annotations.field_type_annotations() != nullptr) {
1478 if (_fields_type_annotations == nullptr) {
1479 _fields_type_annotations =
1480 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1481 length,
1482 nullptr,
1483 CHECK);
1484 }
1485 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1486 parsed_annotations.set_field_type_annotations(nullptr);
1487 }
1488
1489 if (is_synthetic) {
1490 access_flags.set_is_synthetic();
1491 }
1492 if (generic_signature_index != 0) {
1493 fieldFlags.update_generic(true);
1494 }
1495 }
1496
1497 if (is_null_restricted) {
1498 fieldFlags.update_null_free_inline_type(true);
1499 }
1500
1501 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1502
1503 // Update number of static oop fields.
1504 if (is_static && is_reference_type(type)) {
1505 _static_oop_count++;
1506 }
1507
1508 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1509 fi.set_index(n);
1510 if (fieldFlags.is_generic()) {
1511 fi.set_generic_signature_index(generic_signature_index);
1512 }
1513 parsed_annotations.apply_to(&fi);
1514 if (fi.field_flags().is_contended()) {
1515 _has_contended_fields = true;
1516 }
1517 if (access_flags.is_strict() && access_flags.is_static()) {
1518 _has_strict_static_fields = true;
1519 }
1520 _temp_field_info->append(fi);
1521 }
1522 assert(_temp_field_info->length() == length, "Must be");
1523
1524 if (num_injected != 0) {
1525 for (int n = 0; n < num_injected; n++) {
1526 // Check for duplicates
1527 if (injected[n].may_be_java) {
1528 const Symbol* const name = injected[n].name();
1529 const Symbol* const signature = injected[n].signature();
1530 bool duplicate = false;
1531 for (int i = 0; i < length; i++) {
1532 const FieldInfo* const f = _temp_field_info->adr_at(i);
1533 if (name == cp->symbol_at(f->name_index()) &&
1534 signature == cp->symbol_at(f->signature_index())) {
1535 // Symbol is desclared in Java so skip this one
1536 duplicate = true;
1537 break;
1538 }
1539 }
1540 if (duplicate) {
1541 // These will be removed from the field array at the end
1542 continue;
1543 }
1544 }
1545
1546 // Injected field
1547 FieldInfo::FieldFlags fflags(0);
1548 fflags.update_injected(true);
1549 AccessFlags aflags;
1550 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1551 int idx = _temp_field_info->append(fi);
1552 _temp_field_info->adr_at(idx)->set_index(idx);
1553 }
1554 }
1555
1556 if (is_inline_type) {
1557 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1558 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1559 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1560 // alive.
1561 FieldInfo::FieldFlags fflags2(0);
1562 fflags2.update_injected(true);
1563 AccessFlags aflags2(JVM_ACC_STATIC);
1564 FieldInfo fi2(aflags2,
1565 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1566 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1567 0,
1568 fflags2);
1569 int idx2 = _temp_field_info->append(fi2);
1570 _temp_field_info->adr_at(idx2)->set_index(idx2);
1571 _static_oop_count++;
1572 }
1573
1574 if (_need_verify && length > 1) {
1575 // Check duplicated fields
1576 ResourceMark rm(THREAD);
1577 // Set containing name-signature pairs
1578 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1579 for (int i = 0; i < _temp_field_info->length(); i++) {
1580 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1581 _temp_field_info->adr_at(i)->signature(_cp));
1582 // If no duplicates, add name/signature in hashtable names_and_sigs.
1583 if(!names_and_sigs->put(name_and_sig, 0)) {
1584 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1585 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1586 return;
1587 }
1588 }
1589 }
1590 }
1591
1592
1932 }
1933 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1934 if (_location != _in_field && _location != _in_class) {
1935 break; // only allow for fields and classes
1936 }
1937 if (!EnableContended || (RestrictContended && !privileged)) {
1938 break; // honor privileges
1939 }
1940 return _jdk_internal_vm_annotation_Contended;
1941 }
1942 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1943 if (_location != _in_method) break; // only allow for methods
1944 if (RestrictReservedStack && !privileged) break; // honor privileges
1945 return _jdk_internal_vm_annotation_ReservedStackAccess;
1946 }
1947 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1948 if (_location != _in_class) break; // only allow for classes
1949 if (!privileged) break; // only allow in privileged code
1950 return _jdk_internal_ValueBased;
1951 }
1952 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1953 if (_location != _in_class) break; // only allow for classes
1954 return _jdk_internal_LooselyConsistentValue;
1955 }
1956 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1957 if (_location != _in_field) break; // only allow for fields
1958 return _jdk_internal_NullRestricted;
1959 }
1960 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1961 return _java_lang_Deprecated;
1962 }
1963 default: {
1964 break;
1965 }
1966 }
1967 return AnnotationCollector::_unknown;
1968 }
1969
1970 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1971 if (is_contended())
1972 // Setting the contended group also sets the contended bit in field flags
1973 f->set_contended_group(contended_group());
1974 if (is_stable())
1975 (f->field_flags_addr())->update_stable(true);
1976 }
1977
1978 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1979 // If there's an error deallocate metadata for field annotations
2163 }
2164
2165 if (runtime_visible_type_annotations_length > 0) {
2166 a = allocate_annotations(runtime_visible_type_annotations,
2167 runtime_visible_type_annotations_length,
2168 CHECK);
2169 cm->set_type_annotations(a);
2170 }
2171 }
2172
2173
2174 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2175 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2176 // Method* to save footprint, so we only know the size of the resulting Method* when the
2177 // entire method attribute is parsed.
2178 //
2179 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2180
2181 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2182 bool is_interface,
2183 bool is_value_class,
2184 bool is_abstract_class,
2185 const ConstantPool* cp,
2186 bool* const has_localvariable_table,
2187 TRAPS) {
2188 assert(cfs != nullptr, "invariant");
2189 assert(cp != nullptr, "invariant");
2190 assert(has_localvariable_table != nullptr, "invariant");
2191
2192 ResourceMark rm(THREAD);
2193 // Parse fixed parts:
2194 // access_flags, name_index, descriptor_index, attributes_count
2195 cfs->guarantee_more(8, CHECK_NULL);
2196
2197 u2 flags = cfs->get_u2_fast();
2198 const u2 name_index = cfs->get_u2_fast();
2199 const int cp_size = cp->length();
2200 guarantee_property(
2201 valid_symbol_at(name_index),
2202 "Illegal constant pool index %u for method name in class file %s",
2203 name_index, CHECK_NULL);
2204 const Symbol* const name = cp->symbol_at(name_index);
2206
2207 const u2 signature_index = cfs->get_u2_fast();
2208 guarantee_property(
2209 valid_symbol_at(signature_index),
2210 "Illegal constant pool index %u for method signature in class file %s",
2211 signature_index, CHECK_NULL);
2212 const Symbol* const signature = cp->symbol_at(signature_index);
2213
2214 if (name == vmSymbols::class_initializer_name()) {
2215 // We ignore the other access flags for a valid class initializer.
2216 // (JVM Spec 2nd ed., chapter 4.6)
2217 if (_major_version < 51) { // backward compatibility
2218 flags = JVM_ACC_STATIC;
2219 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2220 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2221 } else {
2222 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2223 return nullptr;
2224 }
2225 } else {
2226 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2227 }
2228
2229 if (name == vmSymbols::object_initializer_name() && is_interface) {
2230 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2231 return nullptr;
2232 }
2233
2234 if (EnableValhalla) {
2235 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2236 && ((flags & JVM_ACC_STATIC) == 0 )
2237 && !_access_flags.is_identity_class()) {
2238 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2239 return nullptr;
2240 }
2241 }
2242
2243 int args_size = -1; // only used when _need_verify is true
2244 if (_need_verify) {
2245 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2246 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2247 verify_legal_method_signature(name, signature, CHECK_NULL);
2248 if (args_size > MAX_ARGS_SIZE) {
2249 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2250 return nullptr;
2251 }
2252 }
2253
2254 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2255
2256 // Default values for code and exceptions attribute elements
2257 u2 max_stack = 0;
2258 u2 max_locals = 0;
2259 u4 code_length = 0;
2260 const u1* code_start = nullptr;
2261 u2 exception_table_length = 0;
2262 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2750 CHECK_NULL);
2751
2752 if (InstanceKlass::is_finalization_enabled() &&
2753 name == vmSymbols::finalize_method_name() &&
2754 signature == vmSymbols::void_method_signature()) {
2755 if (m->is_empty_method()) {
2756 _has_empty_finalizer = true;
2757 } else {
2758 _has_finalizer = true;
2759 }
2760 }
2761
2762 NOT_PRODUCT(m->verify());
2763 return m;
2764 }
2765
2766
2767 // Side-effects: populates the _methods field in the parser
2768 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2769 bool is_interface,
2770 bool is_value_class,
2771 bool is_abstract_type,
2772 bool* const has_localvariable_table,
2773 bool* has_final_method,
2774 bool* declares_nonstatic_concrete_methods,
2775 TRAPS) {
2776 assert(cfs != nullptr, "invariant");
2777 assert(has_localvariable_table != nullptr, "invariant");
2778 assert(has_final_method != nullptr, "invariant");
2779 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2780
2781 assert(nullptr == _methods, "invariant");
2782
2783 cfs->guarantee_more(2, CHECK); // length
2784 const u2 length = cfs->get_u2_fast();
2785 if (length == 0) {
2786 _methods = Universe::the_empty_method_array();
2787 } else {
2788 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2789 length,
2790 nullptr,
2791 CHECK);
2792
2793 for (int index = 0; index < length; index++) {
2794 Method* method = parse_method(cfs,
2795 is_interface,
2796 is_value_class,
2797 is_abstract_type,
2798 _cp,
2799 has_localvariable_table,
2800 CHECK);
2801
2802 if (method->is_final()) {
2803 *has_final_method = true;
2804 }
2805 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2806 // used for interface initialization, and default method inheritance analysis
2807 if (is_interface && !(*declares_nonstatic_concrete_methods)
2808 && !method->is_abstract() && !method->is_static()) {
2809 *declares_nonstatic_concrete_methods = true;
2810 }
2811 _methods->at_put(index, method);
2812 }
2813
2814 if (_need_verify && length > 1) {
2815 // Check duplicated methods
2816 ResourceMark rm(THREAD);
2817 // Set containing name-signature pairs
3043 valid_klass_reference_at(outer_class_info_index),
3044 "outer_class_info_index %u has bad constant type in class file %s",
3045 outer_class_info_index, CHECK_0);
3046
3047 if (outer_class_info_index != 0) {
3048 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3049 char* bytes = (char*)outer_class_name->bytes();
3050 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3051 "Outer class is an array class in class file %s", CHECK_0);
3052 }
3053 // Inner class name
3054 const u2 inner_name_index = cfs->get_u2_fast();
3055 guarantee_property(
3056 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3057 "inner_name_index %u has bad constant type in class file %s",
3058 inner_name_index, CHECK_0);
3059 if (_need_verify) {
3060 guarantee_property(inner_class_info_index != outer_class_info_index,
3061 "Class is both outer and inner class in class file %s", CHECK_0);
3062 }
3063
3064 u2 recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3065 // JVM_ACC_MODULE is defined in JDK-9 and later.
3066 if (_major_version >= JAVA_9_VERSION) {
3067 recognized_modifiers |= JVM_ACC_MODULE;
3068 }
3069
3070 // Access flags
3071 u2 flags = cfs->get_u2_fast() & recognized_modifiers;
3072
3073 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3074 // Set abstract bit for old class files for backward compatibility
3075 flags |= JVM_ACC_ABSTRACT;
3076 }
3077
3078 if (!supports_inline_types()) {
3079 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3080 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3081 if (!is_module && !is_interface) {
3082 flags |= JVM_ACC_IDENTITY;
3083 }
3084 }
3085
3086 const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3087 verify_legal_class_modifiers(flags, name, false, CHECK_0);
3088 AccessFlags inner_access_flags(flags);
3089
3090 inner_classes->at_put(index++, inner_class_info_index);
3091 inner_classes->at_put(index++, outer_class_info_index);
3092 inner_classes->at_put(index++, inner_name_index);
3093 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3094 }
3095
3096 // Check for circular and duplicate entries.
3097 bool has_circularity = false;
3098 if (_need_verify) {
3099 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3100 if (has_circularity) {
3101 // If circularity check failed then ignore InnerClasses attribute.
3102 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3103 index = 0;
3104 if (parsed_enclosingmethod_attribute) {
3105 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3106 _inner_classes = inner_classes;
3107 } else {
3171 if (length > 0) {
3172 int index = 0;
3173 cfs->guarantee_more(2 * length, CHECK_0);
3174 for (int n = 0; n < length; n++) {
3175 const u2 class_info_index = cfs->get_u2_fast();
3176 guarantee_property(
3177 valid_klass_reference_at(class_info_index),
3178 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3179 class_info_index, CHECK_0);
3180 permitted_subclasses->at_put(index++, class_info_index);
3181 }
3182 assert(index == size, "wrong size");
3183 }
3184
3185 // Restore buffer's current position.
3186 cfs->set_current(current_mark);
3187
3188 return length;
3189 }
3190
3191 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3192 const u1* const loadable_descriptors_attribute_start,
3193 TRAPS) {
3194 const u1* const current_mark = cfs->current();
3195 u2 length = 0;
3196 if (loadable_descriptors_attribute_start != nullptr) {
3197 cfs->set_current(loadable_descriptors_attribute_start);
3198 cfs->guarantee_more(2, CHECK_0); // length
3199 length = cfs->get_u2_fast();
3200 }
3201 const int size = length;
3202 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3203 _loadable_descriptors = loadable_descriptors;
3204 if (length > 0) {
3205 int index = 0;
3206 cfs->guarantee_more(2 * length, CHECK_0);
3207 for (int n = 0; n < length; n++) {
3208 const u2 descriptor_index = cfs->get_u2_fast();
3209 guarantee_property(
3210 valid_symbol_at(descriptor_index),
3211 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3212 descriptor_index, CHECK_0);
3213 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3214 bool valid = legal_field_signature(descriptor, CHECK_0);
3215 if(!valid) {
3216 ResourceMark rm(THREAD);
3217 Exceptions::fthrow(THREAD_AND_LOCATION,
3218 vmSymbols::java_lang_ClassFormatError(),
3219 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3220 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3221 return 0;
3222 }
3223 loadable_descriptors->at_put(index++, descriptor_index);
3224 }
3225 assert(index == size, "wrong size");
3226 }
3227
3228 // Restore buffer's current position.
3229 cfs->set_current(current_mark);
3230
3231 return length;
3232 }
3233
3234 // Record {
3235 // u2 attribute_name_index;
3236 // u4 attribute_length;
3237 // u2 components_count;
3238 // component_info components[components_count];
3239 // }
3240 // component_info {
3241 // u2 name_index;
3242 // u2 descriptor_index
3243 // u2 attributes_count;
3244 // attribute_info_attributes[attributes_count];
3245 // }
3246 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3247 const ConstantPool* cp,
3248 const u1* const record_attribute_start,
3249 TRAPS) {
3250 const u1* const current_mark = cfs->current();
3251 int components_count = 0;
3252 unsigned int calculate_attr_size = 0;
3253 if (record_attribute_start != nullptr) {
3479 }
3480 guarantee_property(current_start + attribute_byte_length == cfs->current(),
3481 "Bad length on BootstrapMethods in class file %s",
3482 CHECK);
3483 }
3484
3485 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3486 ConstantPool* cp,
3487 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3488 TRAPS) {
3489 assert(cfs != nullptr, "invariant");
3490 assert(cp != nullptr, "invariant");
3491 assert(parsed_annotations != nullptr, "invariant");
3492
3493 // Set inner classes attribute to default sentinel
3494 _inner_classes = Universe::the_empty_short_array();
3495 // Set nest members attribute to default sentinel
3496 _nest_members = Universe::the_empty_short_array();
3497 // Set _permitted_subclasses attribute to default sentinel
3498 _permitted_subclasses = Universe::the_empty_short_array();
3499 // Set _loadable_descriptors attribute to default sentinel
3500 _loadable_descriptors = Universe::the_empty_short_array();
3501 cfs->guarantee_more(2, CHECK); // attributes_count
3502 u2 attributes_count = cfs->get_u2_fast();
3503 bool parsed_sourcefile_attribute = false;
3504 bool parsed_innerclasses_attribute = false;
3505 bool parsed_nest_members_attribute = false;
3506 bool parsed_permitted_subclasses_attribute = false;
3507 bool parsed_loadable_descriptors_attribute = false;
3508 bool parsed_nest_host_attribute = false;
3509 bool parsed_record_attribute = false;
3510 bool parsed_enclosingmethod_attribute = false;
3511 bool parsed_bootstrap_methods_attribute = false;
3512 const u1* runtime_visible_annotations = nullptr;
3513 int runtime_visible_annotations_length = 0;
3514 const u1* runtime_visible_type_annotations = nullptr;
3515 int runtime_visible_type_annotations_length = 0;
3516 bool runtime_invisible_type_annotations_exists = false;
3517 bool runtime_invisible_annotations_exists = false;
3518 bool parsed_source_debug_ext_annotations_exist = false;
3519 const u1* inner_classes_attribute_start = nullptr;
3520 u4 inner_classes_attribute_length = 0;
3521 u2 enclosing_method_class_index = 0;
3522 u2 enclosing_method_method_index = 0;
3523 const u1* nest_members_attribute_start = nullptr;
3524 u4 nest_members_attribute_length = 0;
3525 const u1* record_attribute_start = nullptr;
3526 u4 record_attribute_length = 0;
3527 const u1* permitted_subclasses_attribute_start = nullptr;
3528 u4 permitted_subclasses_attribute_length = 0;
3529 const u1* loadable_descriptors_attribute_start = nullptr;
3530 u4 loadable_descriptors_attribute_length = 0;
3531
3532 // Iterate over attributes
3533 while (attributes_count--) {
3534 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3535 const u2 attribute_name_index = cfs->get_u2_fast();
3536 const u4 attribute_length = cfs->get_u4_fast();
3537 guarantee_property(
3538 valid_symbol_at(attribute_name_index),
3539 "Attribute name has bad constant pool index %u in class file %s",
3540 attribute_name_index, CHECK);
3541 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3542 if (tag == vmSymbols::tag_source_file()) {
3543 // Check for SourceFile tag
3544 if (_need_verify) {
3545 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3546 }
3547 if (parsed_sourcefile_attribute) {
3548 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3549 return;
3550 } else {
3726 return;
3727 }
3728 parsed_record_attribute = true;
3729 record_attribute_start = cfs->current();
3730 record_attribute_length = attribute_length;
3731 } else if (_major_version >= JAVA_17_VERSION) {
3732 if (tag == vmSymbols::tag_permitted_subclasses()) {
3733 if (parsed_permitted_subclasses_attribute) {
3734 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3735 return;
3736 }
3737 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3738 if (_access_flags.is_final()) {
3739 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3740 return;
3741 }
3742 parsed_permitted_subclasses_attribute = true;
3743 permitted_subclasses_attribute_start = cfs->current();
3744 permitted_subclasses_attribute_length = attribute_length;
3745 }
3746 if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3747 if (parsed_loadable_descriptors_attribute) {
3748 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3749 return;
3750 }
3751 parsed_loadable_descriptors_attribute = true;
3752 loadable_descriptors_attribute_start = cfs->current();
3753 loadable_descriptors_attribute_length = attribute_length;
3754 }
3755 }
3756 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3757 cfs->skip_u1(attribute_length, CHECK);
3758 } else {
3759 // Unknown attribute
3760 cfs->skip_u1(attribute_length, CHECK);
3761 }
3762 } else {
3763 // Unknown attribute
3764 cfs->skip_u1(attribute_length, CHECK);
3765 }
3766 } else {
3767 // Unknown attribute
3768 cfs->skip_u1(attribute_length, CHECK);
3769 }
3770 }
3771 _class_annotations = allocate_annotations(runtime_visible_annotations,
3772 runtime_visible_annotations_length,
3773 CHECK);
3774 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3811 CHECK);
3812 if (_need_verify) {
3813 guarantee_property(record_attribute_length == calculated_attr_length,
3814 "Record attribute has wrong length in class file %s",
3815 CHECK);
3816 }
3817 }
3818
3819 if (parsed_permitted_subclasses_attribute) {
3820 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3821 cfs,
3822 permitted_subclasses_attribute_start,
3823 CHECK);
3824 if (_need_verify) {
3825 guarantee_property(
3826 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3827 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3828 }
3829 }
3830
3831 if (parsed_loadable_descriptors_attribute) {
3832 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3833 cfs,
3834 loadable_descriptors_attribute_start,
3835 CHECK);
3836 if (_need_verify) {
3837 guarantee_property(
3838 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3839 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3840 }
3841 }
3842
3843 if (_max_bootstrap_specifier_index >= 0) {
3844 guarantee_property(parsed_bootstrap_methods_attribute,
3845 "Missing BootstrapMethods attribute in class file %s", CHECK);
3846 }
3847 }
3848
3849 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3850 assert(k != nullptr, "invariant");
3851
3852 if (_synthetic_flag)
3853 k->set_is_synthetic();
3854 if (_sourcefile_index != 0) {
3855 k->set_source_file_name_index(_sourcefile_index);
3856 }
3857 if (_generic_signature_index != 0) {
3858 k->set_generic_signature_index(_generic_signature_index);
3859 }
3860 if (_sde_buffer != nullptr) {
3861 k->set_source_debug_extension(_sde_buffer, _sde_length);
3862 }
3888 _class_annotations = nullptr;
3889 _class_type_annotations = nullptr;
3890 _fields_annotations = nullptr;
3891 _fields_type_annotations = nullptr;
3892 }
3893
3894 // Transfer ownership of metadata allocated to the InstanceKlass.
3895 void ClassFileParser::apply_parsed_class_metadata(
3896 InstanceKlass* this_klass,
3897 int java_fields_count) {
3898 assert(this_klass != nullptr, "invariant");
3899
3900 _cp->set_pool_holder(this_klass);
3901 this_klass->set_constants(_cp);
3902 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3903 this_klass->set_fields_status(_fields_status);
3904 this_klass->set_methods(_methods);
3905 this_klass->set_inner_classes(_inner_classes);
3906 this_klass->set_nest_members(_nest_members);
3907 this_klass->set_nest_host_index(_nest_host);
3908 this_klass->set_loadable_descriptors(_loadable_descriptors);
3909 this_klass->set_annotations(_combined_annotations);
3910 this_klass->set_permitted_subclasses(_permitted_subclasses);
3911 this_klass->set_record_components(_record_components);
3912 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3913
3914 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3915 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3916 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3917 // its _super. If an OOM occurs while loading the current klass, its _super field
3918 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3919 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3920 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3921
3922 // Clear out these fields so they don't get deallocated by the destructor
3923 clear_class_metadata();
3924 }
3925
3926 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3927 int anno_length,
3928 TRAPS) {
3929 AnnotationArray* annotations = nullptr;
3930 if (anno != nullptr) {
3931 annotations = MetadataFactory::new_array<u1>(_loader_data,
3932 anno_length,
3933 CHECK_(annotations));
3934 for (int i = 0; i < anno_length; i++) {
3935 annotations->at_put(i, anno[i]);
3936 }
3937 }
3938 return annotations;
3939 }
3940
3941 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3942 const int super_class_index,
3943 const bool need_verify,
3944 TRAPS) {
3945 assert(cp != nullptr, "invariant");
3946 const InstanceKlass* super_klass = nullptr;
3947
3948 if (super_class_index == 0) {
3949 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3950 "Invalid superclass index 0 in class file %s",
3951 CHECK_NULL);
3952 } else {
3953 guarantee_property(valid_klass_reference_at(super_class_index),
3954 "Invalid superclass index %u in class file %s",
3955 super_class_index,
3956 CHECK_NULL);
3957 // The class name should be legal because it is checked when parsing constant pool.
3958 // However, make sure it is not an array type.
3959 if (cp->tag_at(super_class_index).is_klass()) {
3960 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3961 }
3962 if (need_verify) {
3963 bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3964 guarantee_property(!is_array,
3965 "Bad superclass name in class file %s", CHECK_NULL);
3966 }
3967 }
3968 return super_klass;
3969 }
3970
3971 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3972 _max_nonstatic_oop_maps = max_blocks;
3973 _nonstatic_oop_map_count = 0;
3974 if (max_blocks == 0) {
3975 _nonstatic_oop_maps = nullptr;
3976 } else {
3977 _nonstatic_oop_maps =
3978 NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3979 memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3980 }
3981 }
3982
3983 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4117
4118 // Check if this klass supports the java.lang.Cloneable interface
4119 if (vmClasses::Cloneable_klass_loaded()) {
4120 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4121 ik->set_is_cloneable();
4122 }
4123 }
4124
4125 // If it cannot be fast-path allocated, set a bit in the layout helper.
4126 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4127 assert(ik->size_helper() > 0, "layout_helper is initialized");
4128 if (ik->is_abstract() || ik->is_interface()
4129 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4130 || ik->size_helper() >= FastAllocateSizeLimit) {
4131 // Forbid fast-path allocation.
4132 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4133 ik->set_layout_helper(lh);
4134 }
4135 }
4136
4137 bool ClassFileParser::supports_inline_types() const {
4138 // Inline types are only supported by class file version 69.65535 and later
4139 return _major_version > JAVA_25_VERSION ||
4140 (_major_version == JAVA_25_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4141 }
4142
4143 // utility methods for appending an array with check for duplicates
4144
4145 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4146 const Array<InstanceKlass*>* const ifs) {
4147 // iterate over new interfaces
4148 for (int i = 0; i < ifs->length(); i++) {
4149 InstanceKlass* const e = ifs->at(i);
4150 assert(e->is_klass() && e->is_interface(), "just checking");
4151 // add new interface
4152 result->append_if_missing(e);
4153 }
4154 }
4155
4156 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4157 Array<InstanceKlass*>* local_ifs,
4158 ClassLoaderData* loader_data,
4159 TRAPS) {
4160 assert(local_ifs != nullptr, "invariant");
4161 assert(loader_data != nullptr, "invariant");
4162
4166 // Add superclass transitive interfaces size
4167 if (super != nullptr) {
4168 super_size = super->transitive_interfaces()->length();
4169 max_transitive_size += super_size;
4170 }
4171 // Add local interfaces' super interfaces
4172 const int local_size = local_ifs->length();
4173 for (int i = 0; i < local_size; i++) {
4174 InstanceKlass* const l = local_ifs->at(i);
4175 max_transitive_size += l->transitive_interfaces()->length();
4176 }
4177 // Finally add local interfaces
4178 max_transitive_size += local_size;
4179 // Construct array
4180 if (max_transitive_size == 0) {
4181 // no interfaces, use canonicalized array
4182 return Universe::the_empty_instance_klass_array();
4183 } else if (max_transitive_size == super_size) {
4184 // no new local interfaces added, share superklass' transitive interface array
4185 return super->transitive_interfaces();
4186 // The three lines below are commented to work around bug JDK-8245487
4187 // } else if (max_transitive_size == local_size) {
4188 // // only local interfaces added, share local interface array
4189 // return local_ifs;
4190 } else {
4191 ResourceMark rm;
4192 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4193
4194 // Copy down from superclass
4195 if (super != nullptr) {
4196 append_interfaces(result, super->transitive_interfaces());
4197 }
4198
4199 // Copy down from local interfaces' superinterfaces
4200 for (int i = 0; i < local_size; i++) {
4201 InstanceKlass* const l = local_ifs->at(i);
4202 append_interfaces(result, l->transitive_interfaces());
4203 }
4204 // Finally add local interfaces
4205 append_interfaces(result, local_ifs);
4206
4207 // length will be less than the max_transitive_size if duplicates were removed
4208 const int length = result->length();
4209 assert(length <= max_transitive_size, "just checking");
4210
4211 Array<InstanceKlass*>* const new_result =
4212 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4213 for (int i = 0; i < length; i++) {
4214 InstanceKlass* const e = result->at(i);
4215 assert(e != nullptr, "just checking");
4216 new_result->at_put(i, e);
4217 }
4218 return new_result;
4219 }
4220 }
4221
4222 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4223 assert(this_klass != nullptr, "invariant");
4224 const Klass* const super = this_klass->super();
4225
4226 if (super != nullptr) {
4227 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4228
4229 if (super->is_final()) {
4230 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4231 return;
4232 }
4233
4234 if (super_ik->is_sealed()) {
4235 stringStream ss;
4236 ResourceMark rm(THREAD);
4237 if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
4238 classfile_icce_error(ss.as_string(), THREAD);
4239 return;
4240 }
4241 }
4242
4243 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4244 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4245 // for a value classes. So, it is treated as a special case for now.
4246 if (!this_klass->access_flags().is_identity_class() &&
4247 super_ik->name() != vmSymbols::java_lang_Object() &&
4248 super_ik->is_identity_class()) {
4249 classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4250 return;
4251 }
4252
4253 Reflection::VerifyClassAccessResults vca_result =
4254 Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4255 if (vca_result != Reflection::ACCESS_OK) {
4256 ResourceMark rm(THREAD);
4257 char* msg = Reflection::verify_class_access_msg(this_klass,
4258 InstanceKlass::cast(super),
4259 vca_result);
4260
4261 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4262 if (msg == nullptr) {
4263 bool same_module = (this_klass->module() == super->module());
4264 Exceptions::fthrow(
4265 THREAD_AND_LOCATION,
4266 vmSymbols::java_lang_IllegalAccessError(),
4267 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4268 this_klass->external_name(),
4269 super->is_abstract() ? "abstract " : "",
4270 super->external_name(),
4271 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4272 (same_module) ? "" : "; ",
4405 const Method* const m = methods->at(index);
4406 // if m is static and not the init method, throw a verify error
4407 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4408 ResourceMark rm(THREAD);
4409
4410 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4411 Exceptions::fthrow(
4412 THREAD_AND_LOCATION,
4413 vmSymbols::java_lang_VerifyError(),
4414 "Illegal static method %s in interface %s",
4415 m->name()->as_C_string(),
4416 this_klass->external_name()
4417 );
4418 return;
4419 }
4420 }
4421 }
4422
4423 // utility methods for format checking
4424
4425 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4426 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4427 const bool is_inner_class = name != nullptr;
4428 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4429 if (is_module) {
4430 ResourceMark rm(THREAD);
4431 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4432 Exceptions::fthrow(
4433 THREAD_AND_LOCATION,
4434 vmSymbols::java_lang_NoClassDefFoundError(),
4435 "%s is not a class because access_flag ACC_MODULE is set",
4436 _class_name->as_C_string());
4437 return;
4438 }
4439
4440 if (!_need_verify) { return; }
4441
4442 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4443 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4444 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4445 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4446 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4447 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4448 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4449 const bool valid_value_class = is_identity || is_interface ||
4450 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4451
4452 if ((is_abstract && is_final) ||
4453 (is_interface && !is_abstract) ||
4454 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4455 (!is_interface && major_gte_1_5 && is_annotation) ||
4456 (!valid_value_class)) {
4457 ResourceMark rm(THREAD);
4458 const char* class_note = "";
4459 if (!valid_value_class) {
4460 class_note = " (a value class must be final or else abstract)";
4461 }
4462 if (name == nullptr) { // Not an inner class
4463 Exceptions::fthrow(
4464 THREAD_AND_LOCATION,
4465 vmSymbols::java_lang_ClassFormatError(),
4466 "Illegal class modifiers in class %s%s: 0x%X",
4467 _class_name->as_C_string(), class_note, flags
4468 );
4469 return;
4470 } else {
4471 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4472 Exceptions::fthrow(
4473 THREAD_AND_LOCATION,
4474 vmSymbols::java_lang_ClassFormatError(),
4475 "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4476 name, class_note, _class_name->as_C_string(), flags
4477 );
4478 return;
4479 }
4480 }
4481 }
4482
4483 static bool has_illegal_visibility(jint flags) {
4484 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4485 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4486 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4487
4488 return ((is_public && is_protected) ||
4489 (is_public && is_private) ||
4490 (is_protected && is_private));
4491 }
4492
4493 // A legal major_version.minor_version must be one of the following:
4494 //
4495 // Major_version >= 45 and major_version < 56, any minor_version.
4496 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4497 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4498 //
4499 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4527 THREAD_AND_LOCATION,
4528 vmSymbols::java_lang_UnsupportedClassVersionError(),
4529 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4530 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4531 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4532 return;
4533 }
4534
4535 if (!Arguments::enable_preview()) {
4536 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4537 class_name, major, minor, THREAD);
4538 return;
4539 }
4540
4541 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4542 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4543 class_name, major, minor, THREAD);
4544 }
4545 }
4546
4547 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4548 AccessFlags class_access_flags,
4549 TRAPS) const {
4550 if (!_need_verify) { return; }
4551
4552 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4553 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4554 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4555 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4556 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4557 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4558 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4559 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4560 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4561 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4562
4563 const bool is_interface = class_access_flags.is_interface();
4564 const bool is_identity_class = class_access_flags.is_identity_class();
4565
4566 bool is_illegal = false;
4567 const char* error_msg = "";
4568
4569 // There is some overlap in the checks that apply, for example interface fields
4570 // must be static, static fields can't be strict, and therefore interfaces can't
4571 // have strict fields. So we don't have to check every possible invalid combination
4572 // individually as long as all are covered. Once we have found an illegal combination
4573 // we can stop checking.
4574
4575 if (!is_illegal) {
4576 if (is_interface) {
4577 if (!is_public || !is_static || !is_final || is_private ||
4578 is_protected || is_volatile || is_transient ||
4579 (major_gte_1_5 && is_enum)) {
4580 is_illegal = true;
4581 error_msg = "interface fields must be public, static and final, and may be synthetic";
4582 }
4583 } else { // not interface
4584 if (has_illegal_visibility(flags)) {
4585 is_illegal = true;
4586 error_msg = "invalid visibility flags for class field";
4587 } else if (is_final && is_volatile) {
4588 is_illegal = true;
4589 error_msg = "fields cannot be final and volatile";
4590 } else if (supports_inline_types()) {
4591 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4592 is_illegal = true;
4593 error_msg = "value class fields must be either non-static final and strict, or static";
4594 }
4595 }
4596 }
4597 }
4598
4599 if (is_illegal) {
4600 ResourceMark rm(THREAD);
4601 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4602 Exceptions::fthrow(
4603 THREAD_AND_LOCATION,
4604 vmSymbols::java_lang_ClassFormatError(),
4605 "Illegal field modifiers (%s) in class %s: 0x%X",
4606 error_msg, _class_name->as_C_string(), flags);
4607 return;
4608 }
4609 }
4610
4611 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4612 AccessFlags class_access_flags,
4613 const Symbol* name,
4614 TRAPS) const {
4615 if (!_need_verify) { return; }
4616
4617 const bool is_public = (flags & JVM_ACC_PUBLIC) != 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_native = (flags & JVM_ACC_NATIVE) != 0;
4622 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4623 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4624 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4625 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4626 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4627 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4628 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4629 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4630 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4631 // LW401 CR required: removal of value factories support
4632 const bool is_interface = class_access_flags.is_interface();
4633 const bool is_identity_class = class_access_flags.is_identity_class();
4634 const bool is_abstract_class = class_access_flags.is_abstract();
4635
4636 bool is_illegal = false;
4637
4638 const char* class_note = "";
4639 if (is_interface) {
4640 if (major_gte_8) {
4641 // Class file version is JAVA_8_VERSION or later Methods of
4642 // interfaces may set any of the flags except ACC_PROTECTED,
4643 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4644 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4645 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4646 (is_native || is_protected || is_final || is_synchronized) ||
4647 // If a specific method of a class or interface has its
4648 // ACC_ABSTRACT flag set, it must not have any of its
4649 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4650 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4651 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4652 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4653 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4654 is_illegal = true;
4655 }
4656 } else if (major_gte_1_5) {
4657 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4658 if (!is_public || is_private || is_protected || is_static || is_final ||
4659 is_synchronized || is_native || !is_abstract || is_strict) {
4660 is_illegal = true;
4661 }
4662 } else {
4663 // Class file version is pre-JAVA_1_5_VERSION
4664 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4665 is_illegal = true;
4666 }
4667 }
4668 } else { // not interface
4669 if (has_illegal_visibility(flags)) {
4670 is_illegal = true;
4671 } else {
4672 if (is_initializer) {
4673 if (is_static || is_final || is_synchronized || is_native ||
4674 is_abstract || (major_gte_1_5 && is_bridge)) {
4675 is_illegal = true;
4676 }
4677 } else { // not initializer
4678 if (!is_identity_class && is_synchronized && !is_static) {
4679 is_illegal = true;
4680 class_note = " (not an identity class)";
4681 } else {
4682 if (is_abstract) {
4683 if ((is_final || is_native || is_private || is_static ||
4684 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4685 is_illegal = true;
4686 }
4687 }
4688 }
4689 }
4690 }
4691 }
4692
4693 if (is_illegal) {
4694 ResourceMark rm(THREAD);
4695 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4696 Exceptions::fthrow(
4697 THREAD_AND_LOCATION,
4698 vmSymbols::java_lang_ClassFormatError(),
4699 "Method %s in class %s%s has illegal modifiers: 0x%X",
4700 name->as_C_string(), _class_name->as_C_string(),
4701 class_note, flags);
4702 return;
4703 }
4704 }
4705
4706 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4707 int length,
4708 TRAPS) const {
4709 assert(_need_verify, "only called when _need_verify is true");
4710 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4711 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4712 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4713 }
4714 }
4715
4716 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4717 // In class names, '/' separates unqualified names. This is verified in this function also.
4718 // Method names also may not contain the characters '<' or '>', unless <init>
4719 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4720 // method. Because these names have been checked as special cases before
4721 // calling this method in verify_legal_method_name.
4739 if (type == ClassFileParser::LegalClass) {
4740 if (p == name || p+1 >= name+length ||
4741 *(p+1) == JVM_SIGNATURE_SLASH) {
4742 return false;
4743 }
4744 } else {
4745 return false; // do not permit '/' unless it's class name
4746 }
4747 break;
4748 case JVM_SIGNATURE_SPECIAL:
4749 case JVM_SIGNATURE_ENDSPECIAL:
4750 // do not permit '<' or '>' in method names
4751 if (type == ClassFileParser::LegalMethod) {
4752 return false;
4753 }
4754 }
4755 }
4756 return true;
4757 }
4758
4759 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4760 if (_loadable_descriptors == nullptr) return false;
4761 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4762 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4763 if (class_name == klass) return true;
4764 }
4765 return false;
4766 }
4767
4768 // Take pointer to a UTF8 byte string (not NUL-terminated).
4769 // Skip over the longest part of the string that could
4770 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4771 // Return a pointer to just past the fieldname.
4772 // Return null if no fieldname at all was found, or in the case of slash_ok
4773 // being true, we saw consecutive slashes (meaning we were looking for a
4774 // qualified path but found something that was badly-formed).
4775 static const char* skip_over_field_name(const char* const name,
4776 bool slash_ok,
4777 unsigned int length) {
4778 const char* p;
4779 jboolean last_is_slash = false;
4780 jboolean not_first_ch = false;
4781
4782 for (p = name; p != name + length; not_first_ch = true) {
4783 const char* old_p = p;
4784 jchar ch = *p;
4785 if (ch < 128) {
4786 p++;
4787 // quick check for ascii
4849 // be taken as a field signature. Allow "void" if void_ok.
4850 // Return a pointer to just past the signature.
4851 // Return null if no legal signature is found.
4852 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4853 bool void_ok,
4854 unsigned int length,
4855 TRAPS) const {
4856 unsigned int array_dim = 0;
4857 while (length > 0) {
4858 switch (signature[0]) {
4859 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4860 case JVM_SIGNATURE_BOOLEAN:
4861 case JVM_SIGNATURE_BYTE:
4862 case JVM_SIGNATURE_CHAR:
4863 case JVM_SIGNATURE_SHORT:
4864 case JVM_SIGNATURE_INT:
4865 case JVM_SIGNATURE_FLOAT:
4866 case JVM_SIGNATURE_LONG:
4867 case JVM_SIGNATURE_DOUBLE:
4868 return signature + 1;
4869 case JVM_SIGNATURE_CLASS:
4870 {
4871 if (_major_version < JAVA_1_5_VERSION) {
4872 // Skip over the class name if one is there
4873 const char* const p = skip_over_field_name(signature + 1, true, --length);
4874
4875 // The next character better be a semicolon
4876 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4877 return p + 1;
4878 }
4879 }
4880 else {
4881 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4882 signature++;
4883 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4884 // Format check signature
4885 if (c != nullptr) {
4886 int newlen = pointer_delta_as_int(c, (char*) signature);
4887 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4888 if (!legal) {
4889 classfile_parse_error("Class name is empty or contains illegal character "
4890 "in descriptor in class file %s",
4891 THREAD);
4892 return nullptr;
4893 }
4894 return signature + newlen + 1;
4895 }
4896 }
4897 return nullptr;
4898 }
4899 case JVM_SIGNATURE_ARRAY:
4900 array_dim++;
4901 if (array_dim > 255) {
4917
4918 // Checks if name is a legal class name.
4919 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4920 if (!_need_verify) { return; }
4921
4922 assert(name->refcount() > 0, "symbol must be kept alive");
4923 char* bytes = (char*)name->bytes();
4924 unsigned int length = name->utf8_length();
4925 bool legal = false;
4926
4927 if (length > 0) {
4928 const char* p;
4929 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4930 p = skip_over_field_signature(bytes, false, length, CHECK);
4931 legal = (p != nullptr) && ((p - bytes) == (int)length);
4932 } else if (_major_version < JAVA_1_5_VERSION) {
4933 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4934 p = skip_over_field_name(bytes, true, length);
4935 legal = (p != nullptr) && ((p - bytes) == (int)length);
4936 }
4937 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4938 && bytes[length - 1] == ';' ) {
4939 // Support for L...; descriptors
4940 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4941 } else {
4942 // 4900761: relax the constraints based on JSR202 spec
4943 // Class names may be drawn from the entire Unicode character set.
4944 // Identifiers between '/' must be unqualified names.
4945 // The utf8 string has been verified when parsing cpool entries.
4946 legal = verify_unqualified_name(bytes, length, LegalClass);
4947 }
4948 }
4949 if (!legal) {
4950 ResourceMark rm(THREAD);
4951 assert(_class_name != nullptr, "invariant");
4952 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4953 Exceptions::fthrow(
4954 THREAD_AND_LOCATION,
4955 vmSymbols::java_lang_ClassFormatError(),
4956 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4957 _class_name->as_C_string()
4958 );
4959 return;
4960 }
4988 THREAD_AND_LOCATION,
4989 vmSymbols::java_lang_ClassFormatError(),
4990 "Illegal field name \"%.*s\" in class %s", length, bytes,
4991 _class_name->as_C_string()
4992 );
4993 return;
4994 }
4995 }
4996
4997 // Checks if name is a legal method name.
4998 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4999 if (!_need_verify) { return; }
5000
5001 assert(name != nullptr, "method name is null");
5002 char* bytes = (char*)name->bytes();
5003 unsigned int length = name->utf8_length();
5004 bool legal = false;
5005
5006 if (length > 0) {
5007 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5008 if (name == vmSymbols::object_initializer_name() ||
5009 name == vmSymbols::class_initializer_name()) {
5010 legal = true;
5011 }
5012 } else if (_major_version < JAVA_1_5_VERSION) {
5013 const char* p;
5014 p = skip_over_field_name(bytes, false, length);
5015 legal = (p != nullptr) && ((p - bytes) == (int)length);
5016 } else {
5017 // 4881221: relax the constraints based on JSR202 spec
5018 legal = verify_unqualified_name(bytes, length, LegalMethod);
5019 }
5020 }
5021
5022 if (!legal) {
5023 ResourceMark rm(THREAD);
5024 assert(_class_name != nullptr, "invariant");
5025 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5026 Exceptions::fthrow(
5027 THREAD_AND_LOCATION,
5028 vmSymbols::java_lang_ClassFormatError(),
5029 "Illegal method name \"%.*s\" in class %s", length, bytes,
5030 _class_name->as_C_string()
5031 );
5032 return;
5033 }
5034 }
5035
5036 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5037 const char* const bytes = (const char*)signature->bytes();
5038 const unsigned int length = signature->utf8_length();
5039 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5040
5041 if (p == nullptr || (p - bytes) != (int)length) {
5042 return false;
5043 }
5044 return true;
5045 }
5046
5047 // Checks if signature is a legal field signature.
5048 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5049 const Symbol* signature,
5050 TRAPS) const {
5051 if (!_need_verify) { return; }
5052
5053 const char* const bytes = (const char*)signature->bytes();
5054 const unsigned int length = signature->utf8_length();
5055 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5056
5057 if (p == nullptr || (p - bytes) != (int)length) {
5058 throwIllegalSignature("Field", name, signature, CHECK);
5059 }
5060 }
5061
5062 // Check that the signature is compatible with the method name. For example,
5063 // check that <init> has a void signature.
5064 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5065 const Symbol* signature,
5066 TRAPS) const {
5067 if (!_need_verify) {
5068 return;
5069 }
5070
5071 // Class initializers cannot have args for class format version >= 51.
5072 if (name == vmSymbols::class_initializer_name() &&
5073 signature != vmSymbols::void_method_signature() &&
5074 _major_version >= JAVA_7_VERSION) {
5075 throwIllegalSignature("Method", name, signature, THREAD);
5076 return;
5077 }
5078
5079 int sig_length = signature->utf8_length();
5080 if (name->utf8_length() > 0 &&
5081 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5082 sig_length > 0 &&
5083 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5084 throwIllegalSignature("Method", name, signature, THREAD);
5085 }
5086 }
5087
5088 // Checks if signature is a legal method signature.
5089 // Returns number of parameters
5090 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5091 const Symbol* signature,
5092 TRAPS) const {
5093 if (!_need_verify) {
5094 // make sure caller's args_size will be less than 0 even for non-static
5095 // method so it will be recomputed in compute_size_of_parameters().
5096 return -2;
5097 }
5098
5099 unsigned int args_size = 0;
5100 const char* p = (const char*)signature->bytes();
5101 unsigned int length = signature->utf8_length();
5102 const char* nextp;
5103
5114 length -= pointer_delta_as_int(nextp, p);
5115 p = nextp;
5116 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5117 }
5118 // The first non-signature thing better be a ')'
5119 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5120 length--;
5121 // Now we better just have a return value
5122 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5123 if (nextp && ((int)length == (nextp - p))) {
5124 return args_size;
5125 }
5126 }
5127 }
5128 // Report error
5129 throwIllegalSignature("Method", name, signature, THREAD);
5130 return 0;
5131 }
5132
5133 int ClassFileParser::static_field_size() const {
5134 assert(_layout_info != nullptr, "invariant");
5135 return _layout_info->_static_field_size;
5136 }
5137
5138 int ClassFileParser::total_oop_map_count() const {
5139 assert(_layout_info != nullptr, "invariant");
5140 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5141 }
5142
5143 jint ClassFileParser::layout_size() const {
5144 assert(_layout_info != nullptr, "invariant");
5145 return _layout_info->_instance_size;
5146 }
5147
5148 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5149 const Array<Method*>* methods) {
5150 assert(ik != nullptr, "invariant");
5151 assert(methods != nullptr, "invariant");
5152
5153 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5154 // (We used to do this lazily, but now we query it in Rewriter,
5155 // which is eagerly done for every method, so we might as well do it now,
5156 // when everything is fresh in memory.)
5157 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5158
5159 if (klass_id != vmSymbolID::NO_SID) {
5160 for (int j = 0; j < methods->length(); ++j) {
5161 Method* method = methods->at(j);
5162 method->init_intrinsic_id(klass_id);
5163
5164 if (CheckIntrinsics) {
5165 // Check if an intrinsic is defined for method 'method',
5240 }
5241 }
5242
5243 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5244 const ClassInstanceInfo& cl_inst_info,
5245 TRAPS) {
5246 if (_klass != nullptr) {
5247 return _klass;
5248 }
5249
5250 InstanceKlass* const ik =
5251 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5252
5253 if (is_hidden()) {
5254 mangle_hidden_class_name(ik);
5255 }
5256
5257 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5258
5259 assert(_klass == ik, "invariant");
5260 return ik;
5261 }
5262
5263 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5264 bool changed_by_loadhook,
5265 const ClassInstanceInfo& cl_inst_info,
5266 TRAPS) {
5267 assert(ik != nullptr, "invariant");
5268
5269 // Set name and CLD before adding to CLD
5270 ik->set_class_loader_data(_loader_data);
5271 ik->set_name(_class_name);
5272
5273 // Add all classes to our internal class loader list here,
5274 // including classes in the bootstrap (null) class loader.
5275 const bool publicize = !is_internal();
5276
5277 _loader_data->add_class(ik, publicize);
5278
5279 set_klass_to_deallocate(ik);
5280
5281 assert(_layout_info != nullptr, "invariant");
5282 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5283 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5284 "sanity");
5285
5286 assert(ik->is_instance_klass(), "sanity");
5287 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5288
5289 // Fill in information already parsed
5290 ik->set_should_verify_class(_need_verify);
5291
5292 // Not yet: supers are done below to support the new subtype-checking fields
5293 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5294 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5295 ik->set_has_strict_static_fields(_has_strict_static_fields);
5296
5297 if (_layout_info->_is_naturally_atomic) {
5298 ik->set_is_naturally_atomic();
5299 }
5300
5301 if (_layout_info->_must_be_atomic) {
5302 ik->set_must_be_atomic();
5303 }
5304
5305 ik->set_static_oop_field_count(_static_oop_count);
5306
5307 // this transfers ownership of a lot of arrays from
5308 // the parser onto the InstanceKlass*
5309 apply_parsed_class_metadata(ik, _java_fields_count);
5310 if (ik->is_inline_klass()) {
5311 InlineKlass::cast(ik)->init_fixed_block();
5312 }
5313
5314 // can only set dynamic nest-host after static nest information is set
5315 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5316 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5317 }
5318
5319 // note that is not safe to use the fields in the parser from this point on
5320 assert(nullptr == _cp, "invariant");
5321 assert(nullptr == _fieldinfo_stream, "invariant");
5322 assert(nullptr == _fields_status, "invariant");
5323 assert(nullptr == _methods, "invariant");
5324 assert(nullptr == _inner_classes, "invariant");
5325 assert(nullptr == _nest_members, "invariant");
5326 assert(nullptr == _loadable_descriptors, "invariant");
5327 assert(nullptr == _combined_annotations, "invariant");
5328 assert(nullptr == _record_components, "invariant");
5329 assert(nullptr == _permitted_subclasses, "invariant");
5330 assert(nullptr == _inline_layout_info_array, "invariant");
5331
5332 if (_has_localvariable_table) {
5333 ik->set_has_localvariable_table(true);
5334 }
5335
5336 if (_has_final_method) {
5337 ik->set_has_final_method();
5338 }
5339
5340 ik->copy_method_ordering(_method_ordering, CHECK);
5341 // The InstanceKlass::_methods_jmethod_ids cache
5342 // is managed on the assumption that the initial cache
5343 // size is equal to the number of methods in the class. If
5344 // that changes, then InstanceKlass::idnum_can_increment()
5345 // has to be changed accordingly.
5346 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5347
5348 ik->set_this_class_index(_this_class_index);
5349
5350 if (_is_hidden) {
5388 if ((_num_miranda_methods > 0) ||
5389 // if this class introduced new miranda methods or
5390 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5391 // super class exists and this class inherited miranda methods
5392 ) {
5393 ik->set_has_miranda_methods(); // then set a flag
5394 }
5395
5396 // Fill in information needed to compute superclasses.
5397 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5398 ik->set_transitive_interfaces(_transitive_interfaces);
5399 ik->set_local_interfaces(_local_interfaces);
5400 _transitive_interfaces = nullptr;
5401 _local_interfaces = nullptr;
5402
5403 // Initialize itable offset tables
5404 klassItable::setup_itable_offset_table(ik);
5405
5406 // Compute transitive closure of interfaces this class implements
5407 // Do final class setup
5408 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5409 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5410 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5411 }
5412
5413 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5414 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5415 ik->set_has_contended_annotations(true);
5416 }
5417
5418 // Fill in has_finalizer and layout_helper
5419 set_precomputed_flags(ik);
5420
5421 // check if this class can access its super class
5422 check_super_class_access(ik, CHECK);
5423
5424 // check if this class can access its superinterfaces
5425 check_super_interface_access(ik, CHECK);
5426
5427 // check if this class overrides any final method
5428 check_final_method_override(ik, CHECK);
5449
5450 assert(_all_mirandas != nullptr, "invariant");
5451
5452 // Generate any default methods - default methods are public interface methods
5453 // that have a default implementation. This is new with Java 8.
5454 if (_has_nonstatic_concrete_methods) {
5455 DefaultMethods::generate_default_methods(ik,
5456 _all_mirandas,
5457 CHECK);
5458 }
5459
5460 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5461 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5462 !module_entry->has_default_read_edges()) {
5463 if (!module_entry->set_has_default_read_edges()) {
5464 // We won a potential race
5465 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5466 }
5467 }
5468
5469 if (is_inline_type()) {
5470 InlineKlass* vk = InlineKlass::cast(ik);
5471 vk->set_payload_alignment(_layout_info->_payload_alignment);
5472 vk->set_payload_offset(_layout_info->_payload_offset);
5473 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5474 vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5475 vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5476 vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5477 vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5478 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5479 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5480 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5481 vk->initialize_calling_convention(CHECK);
5482 }
5483
5484 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5485
5486 if (!is_internal()) {
5487 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5488
5489 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5490 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5491 log_is_enabled(Info, class, preview)) {
5492 ResourceMark rm;
5493 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5494 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5495 }
5496
5497 if (log_is_enabled(Debug, class, resolve)) {
5498 ResourceMark rm;
5499 // print out the superclass.
5500 const char * from = ik->external_name();
5501 if (ik->java_super() != nullptr) {
5502 log_debug(class, resolve)("%s %s (super)",
5503 from,
5545 ClassLoaderData* loader_data,
5546 const ClassLoadInfo* cl_info,
5547 Publicity pub_level,
5548 TRAPS) :
5549 _stream(stream),
5550 _class_name(nullptr),
5551 _loader_data(loader_data),
5552 _is_hidden(cl_info->is_hidden()),
5553 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5554 _orig_cp_size(0),
5555 _static_oop_count(0),
5556 _super_klass(),
5557 _cp(nullptr),
5558 _fieldinfo_stream(nullptr),
5559 _fields_status(nullptr),
5560 _methods(nullptr),
5561 _inner_classes(nullptr),
5562 _nest_members(nullptr),
5563 _nest_host(0),
5564 _permitted_subclasses(nullptr),
5565 _loadable_descriptors(nullptr),
5566 _record_components(nullptr),
5567 _local_interfaces(nullptr),
5568 _local_interface_indexes(nullptr),
5569 _transitive_interfaces(nullptr),
5570 _combined_annotations(nullptr),
5571 _class_annotations(nullptr),
5572 _class_type_annotations(nullptr),
5573 _fields_annotations(nullptr),
5574 _fields_type_annotations(nullptr),
5575 _klass(nullptr),
5576 _klass_to_deallocate(nullptr),
5577 _parsed_annotations(nullptr),
5578 _layout_info(nullptr),
5579 _inline_layout_info_array(nullptr),
5580 _temp_field_info(nullptr),
5581 _method_ordering(nullptr),
5582 _all_mirandas(nullptr),
5583 _vtable_size(0),
5584 _itable_size(0),
5585 _num_miranda_methods(0),
5586 _protection_domain(cl_info->protection_domain()),
5587 _access_flags(),
5588 _pub_level(pub_level),
5589 _bad_constant_seen(0),
5590 _synthetic_flag(false),
5591 _sde_length(false),
5592 _sde_buffer(nullptr),
5593 _sourcefile_index(0),
5594 _generic_signature_index(0),
5595 _major_version(0),
5596 _minor_version(0),
5597 _this_class_index(0),
5598 _super_class_index(0),
5599 _itfs_len(0),
5600 _java_fields_count(0),
5601 _need_verify(false),
5602 _has_nonstatic_concrete_methods(false),
5603 _declares_nonstatic_concrete_methods(false),
5604 _has_localvariable_table(false),
5605 _has_final_method(false),
5606 _has_contended_fields(false),
5607 _has_strict_static_fields(false),
5608 _has_inline_type_fields(false),
5609 _is_naturally_atomic(false),
5610 _must_be_atomic(true),
5611 _has_loosely_consistent_annotation(false),
5612 _has_finalizer(false),
5613 _has_empty_finalizer(false),
5614 _max_bootstrap_specifier_index(-1) {
5615
5616 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5617 _class_name->increment_refcount();
5618
5619 assert(_loader_data != nullptr, "invariant");
5620 assert(stream != nullptr, "invariant");
5621 assert(_stream != nullptr, "invariant");
5622 assert(_stream->buffer() == _stream->current(), "invariant");
5623 assert(_class_name != nullptr, "invariant");
5624 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5625
5626 // Figure out whether we can skip format checking (matching classic VM behavior)
5627 // Always verify CFLH bytes from the user agents.
5628 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5629
5630 // synch back verification state to stream to check for truncation.
5631 stream->set_need_verify(_need_verify);
5632
5633 parse_stream(stream, CHECK);
5634
5635 post_process_parsed_stream(stream, _cp, CHECK);
5636 }
5637
5638 void ClassFileParser::clear_class_metadata() {
5639 // metadata created before the instance klass is created. Must be
5640 // deallocated if classfile parsing returns an error.
5641 _cp = nullptr;
5642 _fieldinfo_stream = nullptr;
5643 _fields_status = nullptr;
5644 _methods = nullptr;
5645 _inner_classes = nullptr;
5646 _nest_members = nullptr;
5647 _permitted_subclasses = nullptr;
5648 _loadable_descriptors = nullptr;
5649 _combined_annotations = nullptr;
5650 _class_annotations = _class_type_annotations = nullptr;
5651 _fields_annotations = _fields_type_annotations = nullptr;
5652 _record_components = nullptr;
5653 _inline_layout_info_array = nullptr;
5654 }
5655
5656 // Destructor to clean up
5657 ClassFileParser::~ClassFileParser() {
5658 _class_name->decrement_refcount();
5659
5660 if (_cp != nullptr) {
5661 MetadataFactory::free_metadata(_loader_data, _cp);
5662 }
5663
5664 if (_fieldinfo_stream != nullptr) {
5665 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5666 }
5667
5668 if (_fields_status != nullptr) {
5669 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5670 }
5671
5672 if (_inline_layout_info_array != nullptr) {
5673 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5674 }
5675
5676 if (_methods != nullptr) {
5677 // Free methods
5678 InstanceKlass::deallocate_methods(_loader_data, _methods);
5679 }
5680
5681 // beware of the Universe::empty_blah_array!!
5682 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5683 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5684 }
5685
5686 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5687 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5688 }
5689
5690 if (_record_components != nullptr) {
5691 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5692 }
5693
5694 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5695 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5696 }
5697
5698 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5699 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5700 }
5701
5702 // Free interfaces
5703 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5704 _local_interfaces, _transitive_interfaces);
5705
5706 if (_combined_annotations != nullptr) {
5707 // After all annotations arrays have been created, they are installed into the
5708 // Annotations object that will be assigned to the InstanceKlass being created.
5709
5710 // Deallocate the Annotations object and the installed annotations arrays.
5711 _combined_annotations->deallocate_contents(_loader_data);
5712
5713 // If the _combined_annotations pointer is non-null,
5714 // then the other annotations fields should have been cleared.
5715 assert(_class_annotations == nullptr, "Should have been cleared");
5716 assert(_class_type_annotations == nullptr, "Should have been cleared");
5717 assert(_fields_annotations == nullptr, "Should have been cleared");
5718 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5719 } else {
5720 // If the annotations arrays were not installed into the Annotations object,
5721 // then they have to be deallocated explicitly.
5766 cp_size, CHECK);
5767
5768 _orig_cp_size = cp_size;
5769 if (is_hidden()) { // Add a slot for hidden class name.
5770 cp_size++;
5771 }
5772
5773 _cp = ConstantPool::allocate(_loader_data,
5774 cp_size,
5775 CHECK);
5776
5777 ConstantPool* const cp = _cp;
5778
5779 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5780
5781 assert(cp_size == (u2)cp->length(), "invariant");
5782
5783 // ACCESS FLAGS
5784 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5785
5786 u2 recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
5787 // JVM_ACC_MODULE is defined in JDK-9 and later.
5788 if (_major_version >= JAVA_9_VERSION) {
5789 recognized_modifiers |= JVM_ACC_MODULE;
5790 }
5791
5792 // Access flags
5793 u2 flags = stream->get_u2_fast() & recognized_modifiers;
5794
5795 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5796 // Set abstract bit for old class files for backward compatibility
5797 flags |= JVM_ACC_ABSTRACT;
5798 }
5799
5800 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5801 if (!supports_inline_types()) {
5802 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5803 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5804 if (!is_module && !is_interface) {
5805 flags |= JVM_ACC_IDENTITY;
5806 }
5807 }
5808
5809
5810 // This class and superclass
5811 _this_class_index = stream->get_u2_fast();
5812 guarantee_property(
5813 valid_cp_range(_this_class_index, cp_size) &&
5814 cp->tag_at(_this_class_index).is_unresolved_klass(),
5815 "Invalid this class index %u in constant pool in class file %s",
5816 _this_class_index, CHECK);
5817
5818 Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5819 assert(class_name_in_cp != nullptr, "class_name can't be null");
5820
5821 bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
5822
5823 verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
5824
5825 _access_flags.set_flags(flags);
5826
5827 short bad_constant = class_bad_constant_seen();
5828 if (bad_constant != 0) {
5829 // Do not throw CFE until after the access_flags are checked because if
5830 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5831 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5832 return;
5833 }
5834
5835 // Don't need to check whether this class name is legal or not.
5836 // It has been checked when constant pool is parsed.
5837 // However, make sure it is not an array type.
5838 if (_need_verify) {
5839 guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5840 "Bad class name in class file %s",
5841 CHECK);
5842 }
5843
5844 #ifdef ASSERT
5845 // Basic sanity checks
5846 if (_is_hidden) {
5847 assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5848 }
5849 #endif
5850
5851 // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5852
5853 if (_is_hidden) {
5854 assert(_class_name != nullptr, "Unexpected null _class_name");
5895 }
5896 ls.cr();
5897 }
5898 }
5899
5900 // SUPERKLASS
5901 _super_class_index = stream->get_u2_fast();
5902 _super_klass = parse_super_class(cp,
5903 _super_class_index,
5904 _need_verify,
5905 CHECK);
5906
5907 // Interfaces
5908 _itfs_len = stream->get_u2_fast();
5909 parse_interfaces(stream,
5910 _itfs_len,
5911 cp,
5912 &_has_nonstatic_concrete_methods,
5913 CHECK);
5914
5915 // Fields (offsets are filled in later)
5916 parse_fields(stream,
5917 _access_flags,
5918 cp,
5919 cp_size,
5920 &_java_fields_count,
5921 CHECK);
5922
5923 assert(_temp_field_info != nullptr, "invariant");
5924
5925 // Methods
5926 parse_methods(stream,
5927 is_interface(),
5928 !is_identity_class(),
5929 is_abstract_class(),
5930 &_has_localvariable_table,
5931 &_has_final_method,
5932 &_declares_nonstatic_concrete_methods,
5933 CHECK);
5934
5935 assert(_methods != nullptr, "invariant");
5936
5937 if (_declares_nonstatic_concrete_methods) {
5938 _has_nonstatic_concrete_methods = true;
5939 }
5940
5941 // Additional attributes/annotations
5942 _parsed_annotations = new ClassAnnotationCollector();
5943 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5944
5945 assert(_inner_classes != nullptr, "invariant");
5946
5947 // Finalize the Annotations metadata object,
5948 // now that all annotation arrays have been created.
5949 create_combined_annotations(CHECK);
5989 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5990 // We have to update the resolved_klass_index and the name_index together
5991 // so extract the existing resolved_klass_index first.
5992 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5993 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5994 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5995 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5996 "Bad name_index");
5997 }
5998
5999 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6000 ConstantPool* cp,
6001 TRAPS) {
6002 assert(stream != nullptr, "invariant");
6003 assert(stream->at_eos(), "invariant");
6004 assert(cp != nullptr, "invariant");
6005 assert(_loader_data != nullptr, "invariant");
6006
6007 if (_class_name == vmSymbols::java_lang_Object()) {
6008 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6009 "java.lang.Object cannot implement an interface in class file %s",
6010 CHECK);
6011 }
6012 // We check super class after class file is parsed and format is checked
6013 if (_super_class_index > 0 && nullptr == _super_klass) {
6014 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6015 if (is_interface()) {
6016 // Before attempting to resolve the superclass, check for class format
6017 // errors not checked yet.
6018 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6019 "Interfaces must have java.lang.Object as superclass in class file %s",
6020 CHECK);
6021 }
6022 Handle loader(THREAD, _loader_data->class_loader());
6023 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6024 _super_klass = vmClasses::Object_klass();
6025 } else {
6026 _super_klass = (const InstanceKlass*)
6027 SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6028 super_class_name,
6029 loader,
6030 true,
6031 CHECK);
6032 }
6033 }
6034
6035 if (_super_klass != nullptr) {
6036 if (_super_klass->is_interface()) {
6037 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6038 return;
6039 }
6040
6041 if (_super_klass->is_final()) {
6042 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6043 return;
6044 }
6045
6046 if (EnableValhalla) {
6047 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6048 }
6049
6050 if (_super_klass->has_nonstatic_concrete_methods()) {
6051 _has_nonstatic_concrete_methods = true;
6052 }
6053 }
6054
6055 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6056 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6057 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6058 _class_name->as_klass_external_name()));
6059 }
6060
6061 // Determining is the class allows tearing or not (default is not)
6062 if (EnableValhalla && !_access_flags.is_identity_class()) {
6063 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6064 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6065 // Conditions above are not sufficient to determine atomicity requirements,
6066 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6067 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6068 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6069 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6070 _must_be_atomic = false;
6071 }
6072 // Apply VM options override
6073 if (*ForceNonTearable != '\0') {
6074 // Allow a command line switch to force the same atomicity property:
6075 const char* class_name_str = _class_name->as_C_string();
6076 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6077 _must_be_atomic = true;
6078 }
6079 }
6080 }
6081
6082 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6083 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6084 if (_local_interface_indexes != nullptr) {
6085 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6086 u2 interface_index = _local_interface_indexes->at(i);
6087 Klass* interf;
6088 if (cp->tag_at(interface_index).is_klass()) {
6089 interf = cp->resolved_klass_at(interface_index);
6090 } else {
6091 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6092
6093 // Don't need to check legal name because it's checked when parsing constant pool.
6094 // But need to make sure it's not an array type.
6095 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6096 "Bad interface name in class file %s", CHECK);
6097
6098 // Call resolve on the interface class name with class circularity checking
6099 interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6100 _class_name,
6101 unresolved_klass,
6102 Handle(THREAD, _loader_data->class_loader()),
6103 false,
6104 CHECK);
6105 }
6106
6107 if (!interf->is_interface()) {
6108 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6109 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6110 _class_name->as_klass_external_name(),
6111 interf->external_name(),
6112 interf->class_in_module_of_loader()));
6113 }
6114
6115 if (EnableValhalla) {
6116 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6117 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6118 }
6119
6120 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6121 _has_nonstatic_concrete_methods = true;
6122 }
6123 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6124 }
6125 }
6126 assert(_local_interfaces != nullptr, "invariant");
6127
6128 // Compute the transitive list of all unique interfaces implemented by this class
6129 _transitive_interfaces =
6130 compute_transitive_interfaces(_super_klass,
6131 _local_interfaces,
6132 _loader_data,
6133 CHECK);
6134
6135 assert(_transitive_interfaces != nullptr, "invariant");
6136
6137 // sort methods
6138 _method_ordering = sort_methods(_methods);
6139
6140 _all_mirandas = new GrowableArray<Method*>(20);
6141
6142 Handle loader(THREAD, _loader_data->class_loader());
6143 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6144 &_num_miranda_methods,
6145 _all_mirandas,
6146 _super_klass,
6147 _methods,
6148 _access_flags,
6149 _major_version,
6150 loader,
6151 _class_name,
6152 _local_interfaces);
6153
6154 // Size of Java itable (in words)
6155 _itable_size = is_interface() ? 0 :
6156 klassItable::compute_itable_size(_transitive_interfaces);
6157
6158 assert(_parsed_annotations != nullptr, "invariant");
6159
6160 if (EnableValhalla) {
6161 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6162 java_fields_count(),
6163 CHECK);
6164 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6165 FieldInfo fieldinfo = *it;
6166 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6167 Symbol* sig = fieldinfo.signature(cp);
6168 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6169 // Pre-load classes of null-free fields that are candidate for flattening
6170 TempNewSymbol s = Signature::strip_envelope(sig);
6171 if (s == _class_name) {
6172 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6173 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6174 }
6175 log_info(class, preload)("Preloading class %s during loading of class %s. "
6176 "Cause: a null-free non-static field is declared with this type",
6177 s->as_C_string(), _class_name->as_C_string());
6178 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s,
6179 Handle(THREAD,
6180 _loader_data->class_loader()),
6181 false, THREAD);
6182 if (HAS_PENDING_EXCEPTION) {
6183 log_warning(class, preload)("Preloading of class %s during loading of class %s "
6184 "(cause: null-free non-static field) failed: %s",
6185 s->as_C_string(), _class_name->as_C_string(),
6186 PENDING_EXCEPTION->klass()->name()->as_C_string());
6187 return; // Exception is still pending
6188 }
6189 assert(klass != nullptr, "Sanity check");
6190 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6191 InlineKlass* vk = InlineKlass::cast(klass);
6192 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6193 log_info(class, preload)("Preloading of class %s during loading of class %s "
6194 "(cause: null-free non-static field) succeeded",
6195 s->as_C_string(), _class_name->as_C_string());
6196 } else if (Signature::has_envelope(sig)) {
6197 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6198 // Those classes would be required later for the flattening of nullable inline type fields
6199 TempNewSymbol name = Signature::strip_envelope(sig);
6200 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6201 log_info(class, preload)("Preloading class %s during loading of class %s. "
6202 "Cause: field type in LoadableDescriptors attribute",
6203 name->as_C_string(), _class_name->as_C_string());
6204 oop loader = loader_data()->class_loader();
6205 Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name,
6206 Handle(THREAD, loader),
6207 false, THREAD);
6208 if (klass != nullptr) {
6209 if (klass->is_inline_klass()) {
6210 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6211 log_info(class, preload)("Preloading of class %s during loading of class %s "
6212 "(cause: field type in LoadableDescriptors attribute) succeeded",
6213 name->as_C_string(), _class_name->as_C_string());
6214 } else {
6215 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6216 log_warning(class, preload)("Preloading class %s during loading of class %s "
6217 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6218 name->as_C_string(), _class_name->as_C_string());
6219 }
6220 } else {
6221 log_warning(class, preload)("Preloading of class %s during loading of class %s "
6222 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6223 name->as_C_string(), _class_name->as_C_string(),
6224 PENDING_EXCEPTION->klass()->name()->as_C_string());
6225 }
6226 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6227 if (HAS_PENDING_EXCEPTION) {
6228 CLEAR_PENDING_EXCEPTION;
6229 }
6230 } else {
6231 // Just poking the system dictionary to see if the class has already be loaded
6232 oop loader = loader_data()->class_loader();
6233 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6234 if (klass != nullptr && klass->is_inline_klass()) {
6235 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6236 }
6237 }
6238 }
6239 }
6240 }
6241
6242 _layout_info = new FieldLayoutInfo();
6243 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6244 _parsed_annotations->is_contended(), is_inline_type(),
6245 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6246 _must_be_atomic, _layout_info, _inline_layout_info_array);
6247 lb.build_layout();
6248 _has_inline_type_fields = _layout_info->_has_inline_fields;
6249
6250 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6251 _fieldinfo_stream =
6252 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6253 injected_fields_count, loader_data(), CHECK);
6254
6255 _fields_status =
6256 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6257 FieldStatus(0), CHECK);
6258
6259 // Strict static fields track initialization status from the beginning of time.
6260 // After this class runs <clinit>, they will be verified as being "not unset".
6261 // See Step 8 of InstanceKlass::initialize_impl.
6262 if (_has_strict_static_fields) {
6263 bool found_one = false;
6264 for (int i = 0; i < _temp_field_info->length(); i++) {
6265 FieldInfo& fi = *_temp_field_info->adr_at(i);
6266 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6267 found_one = true;
6268 if (fi.initializer_index() != 0) {
6269 // skip strict static fields with ConstantValue attributes
6270 } else {
6271 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6272 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6273 }
6274 }
6275 }
6276 assert(found_one == _has_strict_static_fields,
6277 "correct prediction = %d", (int)_has_strict_static_fields);
6278 }
6279 }
6280
6281 void ClassFileParser::set_klass(InstanceKlass* klass) {
6282
6283 #ifdef ASSERT
6284 if (klass != nullptr) {
6285 assert(nullptr == _klass, "leaking?");
6286 }
6287 #endif
6288
6289 _klass = klass;
6290 }
6291
6292 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6293
6294 #ifdef ASSERT
6295 if (klass != nullptr) {
6296 assert(nullptr == _klass_to_deallocate, "leaking?");
6297 }
6298 #endif
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