1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "cds/cdsConfig.hpp"
25 #include "classfile/classFileParser.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoadInfo.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/fieldLayoutBuilder.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/bsmAttribute.inline.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldInfo.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/instanceKlass.inline.hpp"
55 #include "oops/instanceMirrorKlass.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/klassVtable.hpp"
58 #include "oops/metadata.hpp"
59 #include "oops/method.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/recordComponent.hpp"
62 #include "oops/symbol.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "prims/jvmtiThreadState.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/fieldDescriptor.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/os.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/reflection.hpp"
72 #include "runtime/safepointVerifiers.hpp"
73 #include "runtime/signature.hpp"
74 #include "runtime/timer.hpp"
75 #include "services/classLoadingService.hpp"
76 #include "services/threadService.hpp"
77 #include "utilities/align.hpp"
78 #include "utilities/bitMap.inline.hpp"
79 #include "utilities/checkedCast.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/exceptions.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/globalDefinitions.hpp"
84 #include "utilities/growableArray.hpp"
85 #include "utilities/hashTable.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/ostream.hpp"
88 #include "utilities/utf8.hpp"
89 #if INCLUDE_CDS
90 #include "classfile/systemDictionaryShared.hpp"
91 #endif
92
93 // We generally try to create the oops directly when parsing, rather than
94 // allocating temporary data structures and copying the bytes twice. A
95 // temporary area is only needed when parsing utf8 entries in the constant
96 // pool and when parsing line number tables.
97
98 // We add assert in debug mode when class format is not checked.
99
100 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
101 #define JAVA_MIN_SUPPORTED_VERSION 45
102 #define JAVA_PREVIEW_MINOR_VERSION 65535
103
104 // Used for two backward compatibility reasons:
105 // - to check for new additions to the class file format in JDK1.5
106 // - to check for bug fixes in the format checker in JDK1.5
107 #define JAVA_1_5_VERSION 49
139 #define JAVA_18_VERSION 62
140
141 #define JAVA_19_VERSION 63
142
143 #define JAVA_20_VERSION 64
144
145 #define JAVA_21_VERSION 65
146
147 #define JAVA_22_VERSION 66
148
149 #define JAVA_23_VERSION 67
150
151 #define JAVA_24_VERSION 68
152
153 #define JAVA_25_VERSION 69
154
155 #define JAVA_26_VERSION 70
156
157 #define JAVA_27_VERSION 71
158
159 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
160 assert((bad_constant == JVM_CONSTANT_Module ||
161 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
162 "Unexpected bad constant pool entry");
163 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
164 }
165
166 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
167 ConstantPool* cp,
168 const int length,
169 TRAPS) {
170 assert(stream != nullptr, "invariant");
171 assert(cp != nullptr, "invariant");
172
173 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
174 // this function (_current can be allocated in a register, with scalar
175 // replacement of aggregates). The _current pointer is copied back to
176 // stream() when this function returns. DON'T call another method within
177 // this method that uses stream().
178 const ClassFileStream cfs1 = *stream;
179 const ClassFileStream* const cfs = &cfs1;
180
181 DEBUG_ONLY(const u1* const old_current = stream->current();)
182
183 // Used for batching symbol allocations.
184 const char* names[SymbolTable::symbol_alloc_batch_size];
185 int lengths[SymbolTable::symbol_alloc_batch_size];
186 int indices[SymbolTable::symbol_alloc_batch_size];
187 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
188 int names_count = 0;
189
190 // parsing Index 0 is unused
191 for (int index = 1; index < length; index++) {
192 // Each of the following case guarantees one more byte in the stream
193 // for the following tag or the access_flags following constant pool,
194 // so we don't need bounds-check for reading tag.
195 const u1 tag = cfs->get_u1_fast();
196 switch (tag) {
197 case JVM_CONSTANT_Class : {
198 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
199 const u2 name_index = cfs->get_u2_fast();
200 cp->klass_index_at_put(index, name_index);
201 break;
202 }
203 case JVM_CONSTANT_Fieldref: {
204 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
205 const u2 class_index = cfs->get_u2_fast();
206 const u2 name_and_type_index = cfs->get_u2_fast();
207 cp->field_at_put(index, class_index, name_and_type_index);
208 break;
209 }
210 case JVM_CONSTANT_Methodref: {
211 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
212 const u2 class_index = cfs->get_u2_fast();
213 const u2 name_and_type_index = cfs->get_u2_fast();
214 cp->method_at_put(index, class_index, name_and_type_index);
215 break;
216 }
217 case JVM_CONSTANT_InterfaceMethodref: {
481 guarantee_property(valid_symbol_at(name_ref_index),
482 "Invalid constant pool index %u in class file %s",
483 name_ref_index, CHECK);
484 guarantee_property(valid_symbol_at(signature_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 signature_ref_index, CHECK);
487 break;
488 }
489 case JVM_CONSTANT_Utf8:
490 break;
491 case JVM_CONSTANT_UnresolvedClass: // fall-through
492 case JVM_CONSTANT_UnresolvedClassInError: {
493 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
494 break;
495 }
496 case JVM_CONSTANT_ClassIndex: {
497 const int class_index = cp->klass_index_at(index);
498 guarantee_property(valid_symbol_at(class_index),
499 "Invalid constant pool index %u in class file %s",
500 class_index, CHECK);
501 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
502 break;
503 }
504 case JVM_CONSTANT_StringIndex: {
505 const int string_index = cp->string_index_at(index);
506 guarantee_property(valid_symbol_at(string_index),
507 "Invalid constant pool index %u in class file %s",
508 string_index, CHECK);
509 Symbol* const sym = cp->symbol_at(string_index);
510 cp->unresolved_string_at_put(index, sym);
511 break;
512 }
513 case JVM_CONSTANT_MethodHandle: {
514 const int ref_index = cp->method_handle_index_at(index);
515 guarantee_property(valid_cp_range(ref_index, length),
516 "Invalid constant pool index %u in class file %s",
517 ref_index, CHECK);
518 const constantTag tag = cp->tag_at(ref_index);
519 const int ref_kind = cp->method_handle_ref_kind_at(index);
520
690 }
691 }
692 } else {
693 if (_need_verify) {
694 // Method name and signature are individually verified above, when iterating
695 // NameAndType_info. Need to check here that signature is non-zero length and
696 // the right type.
697 if (!Signature::is_method(signature)) {
698 throwIllegalSignature("Method", name, signature, CHECK);
699 }
700 }
701 // If a class method name begins with '<', it must be "<init>" and have void signature.
702 const unsigned int name_len = name->utf8_length();
703 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
704 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
705 if (name != vmSymbols::object_initializer_name()) {
706 classfile_parse_error(
707 "Bad method name at constant pool index %u in class file %s",
708 name_ref_index, THREAD);
709 return;
710 } else if (!Signature::is_void_method(signature)) { // must have void signature.
711 throwIllegalSignature("Method", name, signature, CHECK);
712 }
713 }
714 }
715 break;
716 }
717 case JVM_CONSTANT_MethodHandle: {
718 const int ref_index = cp->method_handle_index_at(index);
719 const int ref_kind = cp->method_handle_ref_kind_at(index);
720 switch (ref_kind) {
721 case JVM_REF_invokeVirtual:
722 case JVM_REF_invokeStatic:
723 case JVM_REF_invokeSpecial:
724 case JVM_REF_newInvokeSpecial: {
725 const int name_and_type_ref_index =
726 cp->uncached_name_and_type_ref_index_at(ref_index);
727 const int name_ref_index =
728 cp->name_ref_index_at(name_and_type_ref_index);
729 const Symbol* const name = cp->symbol_at(name_ref_index);
730 if (ref_kind == JVM_REF_newInvokeSpecial) {
731 if (name != vmSymbols::object_initializer_name()) {
732 classfile_parse_error(
733 "Bad constructor name at constant pool index %u in class file %s",
734 name_ref_index, THREAD);
735 return;
736 }
737 } else {
738 if (name == vmSymbols::object_initializer_name()) {
739 classfile_parse_error(
740 "Bad method name at constant pool index %u in class file %s",
741 name_ref_index, THREAD);
742 return;
743 }
744 }
745 break;
746 }
747 // Other ref_kinds are already fully checked in previous pass.
748 } // switch(ref_kind)
749 break;
750 }
751 case JVM_CONSTANT_MethodType: {
752 const Symbol* const no_name = vmSymbols::type_name(); // place holder
753 const Symbol* const signature = cp->method_type_signature_at(index);
754 verify_legal_method_signature(no_name, signature, CHECK);
755 break;
756 }
757 case JVM_CONSTANT_Utf8: {
758 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
770
771 NameSigHash(Symbol* name, Symbol* sig) :
772 _name(name),
773 _sig(sig) {}
774
775 static unsigned int hash(NameSigHash const& namesig) {
776 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
777 }
778
779 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
780 return (e0._name == e1._name) &&
781 (e0._sig == e1._sig);
782 }
783 };
784
785 using NameSigHashtable = HashTable<NameSigHash, int,
786 NameSigHash::HASH_ROW_SIZE,
787 AnyObj::RESOURCE_AREA, mtInternal,
788 &NameSigHash::hash, &NameSigHash::equals>;
789
790 // Side-effects: populates the _local_interfaces field
791 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
792 const int itfs_len,
793 ConstantPool* const cp,
794 bool* const has_nonstatic_concrete_methods,
795 TRAPS) {
796 assert(stream != nullptr, "invariant");
797 assert(cp != nullptr, "invariant");
798 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
799
800 if (itfs_len == 0) {
801 _local_interfaces = Universe::the_empty_instance_klass_array();
802 } else {
803 assert(itfs_len > 0, "only called for len>0");
804 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
805
806 int index;
807 for (index = 0; index < itfs_len; index++) {
808 const u2 interface_index = stream->get_u2(CHECK);
809 Klass* interf;
810 guarantee_property(
811 valid_klass_reference_at(interface_index),
812 "Interface name has bad constant pool index %u in class file %s",
813 interface_index, CHECK);
814 if (cp->tag_at(interface_index).is_klass()) {
815 interf = cp->resolved_klass_at(interface_index);
816 } else {
817 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
818
819 // Don't need to check legal name because it's checked when parsing constant pool.
820 // But need to make sure it's not an array type.
821 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
822 "Bad interface name in class file %s", CHECK);
823
824 // Call resolve on the interface class name with class circularity checking
825 interf = SystemDictionary::resolve_super_or_fail(_class_name,
826 unresolved_klass,
827 Handle(THREAD, _loader_data->class_loader()),
828 false, CHECK);
829 }
830
831 if (!interf->is_interface()) {
832 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
833 err_msg("class %s can not implement %s, because it is not an interface (%s)",
834 _class_name->as_klass_external_name(),
835 interf->external_name(),
836 interf->class_in_module_of_loader()));
837 }
838
839 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
840 *has_nonstatic_concrete_methods = true;
841 }
842 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
843 }
844
845 if (!_need_verify || itfs_len <= 1) {
846 return;
847 }
848
849 // Check if there's any duplicates in interfaces
850 ResourceMark rm(THREAD);
851 // Set containing interface names
852 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
853 for (index = 0; index < itfs_len; index++) {
854 const InstanceKlass* const k = _local_interfaces->at(index);
855 Symbol* interface_name = k->name();
856 // If no duplicates, add (name, nullptr) in hashtable interface_names.
857 if (!interface_names->put(interface_name, 0)) {
858 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
859 interface_name->as_C_string(), THREAD);
860 return;
861 }
862 }
863 }
864 }
865
866 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
867 int constantvalue_index,
868 int signature_index,
869 TRAPS) const {
870 // Make sure the constant pool entry is of a type appropriate to this field
871 guarantee_property(
872 (constantvalue_index > 0 &&
873 constantvalue_index < cp->length()),
874 "Bad initial value index %u in ConstantValue attribute in class file %s",
875 constantvalue_index, CHECK);
922 class AnnotationCollector : public ResourceObj{
923 public:
924 enum Location { _in_field, _in_method, _in_class };
925 enum ID {
926 _unknown = 0,
927 _method_CallerSensitive,
928 _method_ForceInline,
929 _method_DontInline,
930 _method_ChangesCurrentThread,
931 _method_JvmtiHideEvents,
932 _method_JvmtiMountTransition,
933 _method_InjectedProfile,
934 _method_LambdaForm_Compiled,
935 _method_Hidden,
936 _method_Scoped,
937 _method_IntrinsicCandidate,
938 _jdk_internal_vm_annotation_Contended,
939 _field_Stable,
940 _jdk_internal_vm_annotation_ReservedStackAccess,
941 _jdk_internal_ValueBased,
942 _java_lang_Deprecated,
943 _java_lang_Deprecated_for_removal,
944 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
945 _method_AOTRuntimeSetup,
946 _annotation_LIMIT
947 };
948 const Location _location;
949 int _annotations_present;
950 u2 _contended_group;
951
952 AnnotationCollector(Location location)
953 : _location(location), _annotations_present(0), _contended_group(0)
954 {
955 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
956 }
957 // If this annotation name has an ID, report it (or _none).
958 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
959 // Set the annotation name:
960 void set_annotation(ID id) {
961 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1348 }
1349
1350 *constantvalue_index_addr = constantvalue_index;
1351 *is_synthetic_addr = is_synthetic;
1352 *generic_signature_index_addr = generic_signature_index;
1353 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1354 runtime_visible_annotations_length,
1355 CHECK);
1356 parsed_annotations->set_field_annotations(a);
1357 a = allocate_annotations(runtime_visible_type_annotations,
1358 runtime_visible_type_annotations_length,
1359 CHECK);
1360 parsed_annotations->set_field_type_annotations(a);
1361 return;
1362 }
1363
1364
1365 // Side-effects: populates the _fields, _fields_annotations,
1366 // _fields_type_annotations fields
1367 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1368 bool is_interface,
1369 ConstantPool* cp,
1370 const int cp_size,
1371 u2* const java_fields_count_ptr,
1372 TRAPS) {
1373
1374 assert(cfs != nullptr, "invariant");
1375 assert(cp != nullptr, "invariant");
1376 assert(java_fields_count_ptr != nullptr, "invariant");
1377
1378 assert(nullptr == _fields_annotations, "invariant");
1379 assert(nullptr == _fields_type_annotations, "invariant");
1380
1381 cfs->guarantee_more(2, CHECK); // length
1382 const u2 length = cfs->get_u2_fast();
1383 *java_fields_count_ptr = length;
1384
1385 int num_injected = 0;
1386 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1387 &num_injected);
1388 const int total_fields = length + num_injected;
1389
1390 // Allocate a temporary resource array to collect field data.
1391 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1392 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1393
1394 ResourceMark rm(THREAD);
1395 for (int n = 0; n < length; n++) {
1396 // access_flags, name_index, descriptor_index, attributes_count
1397 cfs->guarantee_more(8, CHECK);
1398
1399 AccessFlags access_flags;
1400 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1401 verify_legal_field_modifiers(flags, is_interface, CHECK);
1402 access_flags.set_flags(flags);
1403 FieldInfo::FieldFlags fieldFlags(0);
1404
1405 const u2 name_index = cfs->get_u2_fast();
1406 guarantee_property(valid_symbol_at(name_index),
1407 "Invalid constant pool index %u for field name in class file %s",
1408 name_index, CHECK);
1409 const Symbol* const name = cp->symbol_at(name_index);
1410 verify_legal_field_name(name, CHECK);
1411
1412 const u2 signature_index = cfs->get_u2_fast();
1413 guarantee_property(valid_symbol_at(signature_index),
1414 "Invalid constant pool index %u for field signature in class file %s",
1415 signature_index, CHECK);
1416 const Symbol* const sig = cp->symbol_at(signature_index);
1417 verify_legal_field_signature(name, sig, CHECK);
1418
1419 u2 constantvalue_index = 0;
1420 bool is_synthetic = false;
1421 u2 generic_signature_index = 0;
1422 const bool is_static = access_flags.is_static();
1423 FieldAnnotationCollector parsed_annotations(_loader_data);
1424
1425 const u2 attributes_count = cfs->get_u2_fast();
1426 if (attributes_count > 0) {
1427 parse_field_attributes(cfs,
1428 attributes_count,
1429 is_static,
1430 signature_index,
1431 &constantvalue_index,
1432 &is_synthetic,
1433 &generic_signature_index,
1434 &parsed_annotations,
1435 CHECK);
1436
1437 if (parsed_annotations.field_annotations() != nullptr) {
1438 if (_fields_annotations == nullptr) {
1439 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1440 _loader_data, length, nullptr,
1441 CHECK);
1442 }
1443 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1444 parsed_annotations.set_field_annotations(nullptr);
1445 }
1446 if (parsed_annotations.field_type_annotations() != nullptr) {
1447 if (_fields_type_annotations == nullptr) {
1448 _fields_type_annotations =
1449 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1450 length,
1451 nullptr,
1452 CHECK);
1453 }
1454 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1455 parsed_annotations.set_field_type_annotations(nullptr);
1456 }
1457
1458 if (is_synthetic) {
1459 access_flags.set_is_synthetic();
1460 }
1461 if (generic_signature_index != 0) {
1462 fieldFlags.update_generic(true);
1463 }
1464 }
1465
1466 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1467
1468 // Update number of static oop fields.
1469 if (is_static && is_reference_type(type)) {
1470 _static_oop_count++;
1471 }
1472
1473 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1474 fi.set_index(n);
1475 if (fieldFlags.is_generic()) {
1476 fi.set_generic_signature_index(generic_signature_index);
1477 }
1478 parsed_annotations.apply_to(&fi);
1479 if (fi.field_flags().is_contended()) {
1480 _has_contended_fields = true;
1481 }
1482 _temp_field_info->append(fi);
1483 }
1484 assert(_temp_field_info->length() == length, "Must be");
1485
1486 int index = length;
1487 if (num_injected != 0) {
1488 for (int n = 0; n < num_injected; n++) {
1489 // Check for duplicates
1490 if (injected[n].may_be_java) {
1491 const Symbol* const name = injected[n].name();
1492 const Symbol* const signature = injected[n].signature();
1493 bool duplicate = false;
1494 for (int i = 0; i < length; i++) {
1495 const FieldInfo* const f = _temp_field_info->adr_at(i);
1496 if (name == cp->symbol_at(f->name_index()) &&
1497 signature == cp->symbol_at(f->signature_index())) {
1498 // Symbol is desclared in Java so skip this one
1499 duplicate = true;
1500 break;
1501 }
1502 }
1503 if (duplicate) {
1504 // These will be removed from the field array at the end
1505 continue;
1506 }
1507 }
1508
1509 // Injected field
1510 FieldInfo::FieldFlags fflags(0);
1511 fflags.update_injected(true);
1512 AccessFlags aflags;
1513 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1514 fi.set_index(index);
1515 _temp_field_info->append(fi);
1516 index++;
1517 }
1518 }
1519
1520 assert(_temp_field_info->length() == index, "Must be");
1521
1522 if (_need_verify && length > 1) {
1523 // Check duplicated fields
1524 ResourceMark rm(THREAD);
1525 // Set containing name-signature pairs
1526 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1527 for (int i = 0; i < _temp_field_info->length(); i++) {
1528 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1529 _temp_field_info->adr_at(i)->signature(_cp));
1530 // If no duplicates, add name/signature in hashtable names_and_sigs.
1531 if(!names_and_sigs->put(name_and_sig, 0)) {
1532 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1533 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1534 return;
1535 }
1536 }
1537 }
1538 }
1539
1540
1880 }
1881 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1882 if (_location != _in_field && _location != _in_class) {
1883 break; // only allow for fields and classes
1884 }
1885 if (!EnableContended || (RestrictContended && !privileged)) {
1886 break; // honor privileges
1887 }
1888 return _jdk_internal_vm_annotation_Contended;
1889 }
1890 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1891 if (_location != _in_method) break; // only allow for methods
1892 if (RestrictReservedStack && !privileged) break; // honor privileges
1893 return _jdk_internal_vm_annotation_ReservedStackAccess;
1894 }
1895 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1896 if (_location != _in_class) break; // only allow for classes
1897 if (!privileged) break; // only allow in privileged code
1898 return _jdk_internal_ValueBased;
1899 }
1900 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1901 return _java_lang_Deprecated;
1902 }
1903 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1904 if (_location != _in_class) break; // only allow for classes
1905 if (!privileged) break; // only allow in privileged code
1906 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1907 }
1908 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1909 if (_location != _in_method) break; // only allow for methods
1910 if (!privileged) break; // only allow in privileged code
1911 return _method_AOTRuntimeSetup;
1912 }
1913 default: {
1914 break;
1915 }
1916 }
1917 return AnnotationCollector::_unknown;
1918 }
1919
2116 }
2117
2118 if (runtime_visible_type_annotations_length > 0) {
2119 a = allocate_annotations(runtime_visible_type_annotations,
2120 runtime_visible_type_annotations_length,
2121 CHECK);
2122 cm->set_type_annotations(a);
2123 }
2124 }
2125
2126
2127 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2128 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2129 // Method* to save footprint, so we only know the size of the resulting Method* when the
2130 // entire method attribute is parsed.
2131 //
2132 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2133
2134 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2135 bool is_interface,
2136 const ConstantPool* cp,
2137 bool* const has_localvariable_table,
2138 TRAPS) {
2139 assert(cfs != nullptr, "invariant");
2140 assert(cp != nullptr, "invariant");
2141 assert(has_localvariable_table != nullptr, "invariant");
2142
2143 ResourceMark rm(THREAD);
2144 // Parse fixed parts:
2145 // access_flags, name_index, descriptor_index, attributes_count
2146 cfs->guarantee_more(8, CHECK_NULL);
2147
2148 u2 flags = cfs->get_u2_fast();
2149 const u2 name_index = cfs->get_u2_fast();
2150 const int cp_size = cp->length();
2151 guarantee_property(
2152 valid_symbol_at(name_index),
2153 "Illegal constant pool index %u for method name in class file %s",
2154 name_index, CHECK_NULL);
2155 const Symbol* const name = cp->symbol_at(name_index);
2157
2158 const u2 signature_index = cfs->get_u2_fast();
2159 guarantee_property(
2160 valid_symbol_at(signature_index),
2161 "Illegal constant pool index %u for method signature in class file %s",
2162 signature_index, CHECK_NULL);
2163 const Symbol* const signature = cp->symbol_at(signature_index);
2164
2165 if (name == vmSymbols::class_initializer_name()) {
2166 // We ignore the other access flags for a valid class initializer.
2167 // (JVM Spec 2nd ed., chapter 4.6)
2168 if (_major_version < 51) { // backward compatibility
2169 flags = JVM_ACC_STATIC;
2170 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2171 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2172 } else {
2173 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2174 return nullptr;
2175 }
2176 } else {
2177 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2178 }
2179
2180 if (name == vmSymbols::object_initializer_name() && is_interface) {
2181 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2182 return nullptr;
2183 }
2184
2185 int args_size = -1; // only used when _need_verify is true
2186 if (_need_verify) {
2187 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2188 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2189 verify_legal_method_signature(name, signature, CHECK_NULL);
2190 if (args_size > MAX_ARGS_SIZE) {
2191 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2192 return nullptr;
2193 }
2194 }
2195
2196 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2197
2198 // Default values for code and exceptions attribute elements
2199 u2 max_stack = 0;
2200 u2 max_locals = 0;
2201 u4 code_length = 0;
2202 const u1* code_start = nullptr;
2203 u2 exception_table_length = 0;
2204 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2699 CHECK_NULL);
2700
2701 if (InstanceKlass::is_finalization_enabled() &&
2702 name == vmSymbols::finalize_method_name() &&
2703 signature == vmSymbols::void_method_signature()) {
2704 if (m->is_empty_method()) {
2705 _has_empty_finalizer = true;
2706 } else {
2707 _has_finalizer = true;
2708 }
2709 }
2710
2711 NOT_PRODUCT(m->verify());
2712 return m;
2713 }
2714
2715
2716 // Side-effects: populates the _methods field in the parser
2717 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2718 bool is_interface,
2719 bool* const has_localvariable_table,
2720 bool* has_final_method,
2721 bool* declares_nonstatic_concrete_methods,
2722 TRAPS) {
2723 assert(cfs != nullptr, "invariant");
2724 assert(has_localvariable_table != nullptr, "invariant");
2725 assert(has_final_method != nullptr, "invariant");
2726 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2727
2728 assert(nullptr == _methods, "invariant");
2729
2730 cfs->guarantee_more(2, CHECK); // length
2731 const u2 length = cfs->get_u2_fast();
2732 if (length == 0) {
2733 _methods = Universe::the_empty_method_array();
2734 } else {
2735 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2736 length,
2737 nullptr,
2738 CHECK);
2739
2740 for (int index = 0; index < length; index++) {
2741 Method* method = parse_method(cfs,
2742 is_interface,
2743 _cp,
2744 has_localvariable_table,
2745 CHECK);
2746
2747 if (method->is_final()) {
2748 *has_final_method = true;
2749 }
2750 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2751 // used for interface initialization, and default method inheritance analysis
2752 if (is_interface && !(*declares_nonstatic_concrete_methods)
2753 && !method->is_abstract() && !method->is_static()) {
2754 *declares_nonstatic_concrete_methods = true;
2755 }
2756 _methods->at_put(index, method);
2757 }
2758
2759 if (_need_verify && length > 1) {
2760 // Check duplicated methods
2761 ResourceMark rm(THREAD);
2762 // Set containing name-signature pairs
2988 valid_klass_reference_at(outer_class_info_index),
2989 "outer_class_info_index %u has bad constant type in class file %s",
2990 outer_class_info_index, CHECK_0);
2991
2992 if (outer_class_info_index != 0) {
2993 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
2994 char* bytes = (char*)outer_class_name->bytes();
2995 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
2996 "Outer class is an array class in class file %s", CHECK_0);
2997 }
2998 // Inner class name
2999 const u2 inner_name_index = cfs->get_u2_fast();
3000 guarantee_property(
3001 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3002 "inner_name_index %u has bad constant type in class file %s",
3003 inner_name_index, CHECK_0);
3004 if (_need_verify) {
3005 guarantee_property(inner_class_info_index != outer_class_info_index,
3006 "Class is both outer and inner class in class file %s", CHECK_0);
3007 }
3008 // Access flags
3009 u2 flags;
3010 // JVM_ACC_MODULE is defined in JDK-9 and later.
3011 if (_major_version >= JAVA_9_VERSION) {
3012 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3013 } else {
3014 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3015 }
3016 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3017 // Set abstract bit for old class files for backward compatibility
3018 flags |= JVM_ACC_ABSTRACT;
3019 }
3020
3021 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3022 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3023 AccessFlags inner_access_flags(flags);
3024
3025 inner_classes->at_put(index++, inner_class_info_index);
3026 inner_classes->at_put(index++, outer_class_info_index);
3027 inner_classes->at_put(index++, inner_name_index);
3028 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3029 }
3030
3031 // Check for circular and duplicate entries.
3032 bool has_circularity = false;
3033 if (_need_verify) {
3034 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3035 if (has_circularity) {
3036 // If circularity check failed then ignore InnerClasses attribute.
3037 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3038 index = 0;
3039 if (parsed_enclosingmethod_attribute) {
3040 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3106 if (length > 0) {
3107 int index = 0;
3108 cfs->guarantee_more(2 * length, CHECK_0);
3109 for (int n = 0; n < length; n++) {
3110 const u2 class_info_index = cfs->get_u2_fast();
3111 guarantee_property(
3112 valid_klass_reference_at(class_info_index),
3113 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3114 class_info_index, CHECK_0);
3115 permitted_subclasses->at_put(index++, class_info_index);
3116 }
3117 assert(index == size, "wrong size");
3118 }
3119
3120 // Restore buffer's current position.
3121 cfs->set_current(current_mark);
3122
3123 return length;
3124 }
3125
3126 // Record {
3127 // u2 attribute_name_index;
3128 // u4 attribute_length;
3129 // u2 components_count;
3130 // component_info components[components_count];
3131 // }
3132 // component_info {
3133 // u2 name_index;
3134 // u2 descriptor_index
3135 // u2 attributes_count;
3136 // attribute_info_attributes[attributes_count];
3137 // }
3138 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3139 const ConstantPool* cp,
3140 const u1* const record_attribute_start,
3141 TRAPS) {
3142 const u1* const current_mark = cfs->current();
3143 int components_count = 0;
3144 unsigned int calculate_attr_size = 0;
3145 if (record_attribute_start != nullptr) {
3356 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3357 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3358 "Bad length on BootstrapMethods in class file %s",
3359 CHECK);
3360 }
3361
3362 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3363 ConstantPool* cp,
3364 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3365 TRAPS) {
3366 assert(cfs != nullptr, "invariant");
3367 assert(cp != nullptr, "invariant");
3368 assert(parsed_annotations != nullptr, "invariant");
3369
3370 // Set inner classes attribute to default sentinel
3371 _inner_classes = Universe::the_empty_short_array();
3372 // Set nest members attribute to default sentinel
3373 _nest_members = Universe::the_empty_short_array();
3374 // Set _permitted_subclasses attribute to default sentinel
3375 _permitted_subclasses = Universe::the_empty_short_array();
3376 cfs->guarantee_more(2, CHECK); // attributes_count
3377 u2 attributes_count = cfs->get_u2_fast();
3378 bool parsed_sourcefile_attribute = false;
3379 bool parsed_innerclasses_attribute = false;
3380 bool parsed_nest_members_attribute = false;
3381 bool parsed_permitted_subclasses_attribute = false;
3382 bool parsed_nest_host_attribute = false;
3383 bool parsed_record_attribute = false;
3384 bool parsed_enclosingmethod_attribute = false;
3385 bool parsed_bootstrap_methods_attribute = false;
3386 const u1* runtime_visible_annotations = nullptr;
3387 int runtime_visible_annotations_length = 0;
3388 const u1* runtime_visible_type_annotations = nullptr;
3389 int runtime_visible_type_annotations_length = 0;
3390 bool runtime_invisible_type_annotations_exists = false;
3391 bool runtime_invisible_annotations_exists = false;
3392 bool parsed_source_debug_ext_annotations_exist = false;
3393 const u1* inner_classes_attribute_start = nullptr;
3394 u4 inner_classes_attribute_length = 0;
3395 u2 enclosing_method_class_index = 0;
3396 u2 enclosing_method_method_index = 0;
3397 const u1* nest_members_attribute_start = nullptr;
3398 u4 nest_members_attribute_length = 0;
3399 const u1* record_attribute_start = nullptr;
3400 u4 record_attribute_length = 0;
3401 const u1* permitted_subclasses_attribute_start = nullptr;
3402 u4 permitted_subclasses_attribute_length = 0;
3403
3404 // Iterate over attributes
3405 while (attributes_count--) {
3406 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3407 const u2 attribute_name_index = cfs->get_u2_fast();
3408 const u4 attribute_length = cfs->get_u4_fast();
3409 guarantee_property(
3410 valid_symbol_at(attribute_name_index),
3411 "Attribute name has bad constant pool index %u in class file %s",
3412 attribute_name_index, CHECK);
3413 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3414 if (tag == vmSymbols::tag_source_file()) {
3415 // Check for SourceFile tag
3416 if (_need_verify) {
3417 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3418 }
3419 if (parsed_sourcefile_attribute) {
3420 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3421 return;
3422 } else {
3598 return;
3599 }
3600 parsed_record_attribute = true;
3601 record_attribute_start = cfs->current();
3602 record_attribute_length = attribute_length;
3603 } else if (_major_version >= JAVA_17_VERSION) {
3604 if (tag == vmSymbols::tag_permitted_subclasses()) {
3605 if (parsed_permitted_subclasses_attribute) {
3606 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3607 return;
3608 }
3609 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3610 if (_access_flags.is_final()) {
3611 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3612 return;
3613 }
3614 parsed_permitted_subclasses_attribute = true;
3615 permitted_subclasses_attribute_start = cfs->current();
3616 permitted_subclasses_attribute_length = attribute_length;
3617 }
3618 }
3619 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3620 cfs->skip_u1(attribute_length, CHECK);
3621 } else {
3622 // Unknown attribute
3623 cfs->skip_u1(attribute_length, CHECK);
3624 }
3625 } else {
3626 // Unknown attribute
3627 cfs->skip_u1(attribute_length, CHECK);
3628 }
3629 } else {
3630 // Unknown attribute
3631 cfs->skip_u1(attribute_length, CHECK);
3632 }
3633 }
3634 _class_annotations = allocate_annotations(runtime_visible_annotations,
3635 runtime_visible_annotations_length,
3636 CHECK);
3637 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3674 CHECK);
3675 if (_need_verify) {
3676 guarantee_property(record_attribute_length == calculated_attr_length,
3677 "Record attribute has wrong length in class file %s",
3678 CHECK);
3679 }
3680 }
3681
3682 if (parsed_permitted_subclasses_attribute) {
3683 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3684 cfs,
3685 permitted_subclasses_attribute_start,
3686 CHECK);
3687 if (_need_verify) {
3688 guarantee_property(
3689 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3690 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3691 }
3692 }
3693
3694 if (_max_bootstrap_specifier_index >= 0) {
3695 guarantee_property(parsed_bootstrap_methods_attribute,
3696 "Missing BootstrapMethods attribute in class file %s", CHECK);
3697 }
3698 }
3699
3700 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3701 assert(k != nullptr, "invariant");
3702
3703 if (_synthetic_flag)
3704 k->set_is_synthetic();
3705 if (_sourcefile_index != 0) {
3706 k->set_source_file_name_index(_sourcefile_index);
3707 }
3708 if (_generic_signature_index != 0) {
3709 k->set_generic_signature_index(_generic_signature_index);
3710 }
3711 if (_sde_buffer != nullptr) {
3712 k->set_source_debug_extension(_sde_buffer, _sde_length);
3713 }
3740 _class_type_annotations = nullptr;
3741 _fields_annotations = nullptr;
3742 _fields_type_annotations = nullptr;
3743 }
3744
3745 // Transfer ownership of metadata allocated to the InstanceKlass.
3746 void ClassFileParser::apply_parsed_class_metadata(
3747 InstanceKlass* this_klass,
3748 int java_fields_count) {
3749 assert(this_klass != nullptr, "invariant");
3750
3751 _cp->set_pool_holder(this_klass);
3752 this_klass->set_constants(_cp);
3753 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3754 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3755 this_klass->set_fields_status(_fields_status);
3756 this_klass->set_methods(_methods);
3757 this_klass->set_inner_classes(_inner_classes);
3758 this_klass->set_nest_members(_nest_members);
3759 this_klass->set_nest_host_index(_nest_host);
3760 this_klass->set_annotations(_combined_annotations);
3761 this_klass->set_permitted_subclasses(_permitted_subclasses);
3762 this_klass->set_record_components(_record_components);
3763
3764 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3765
3766 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3767 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3768 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3769 // its _super. If an OOM occurs while loading the current klass, its _super field
3770 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3771 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3772 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3773
3774 // Clear out these fields so they don't get deallocated by the destructor
3775 clear_class_metadata();
3776 }
3777
3778 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3779 int anno_length,
3780 TRAPS) {
3781 AnnotationArray* annotations = nullptr;
3782 if (anno != nullptr) {
3783 annotations = MetadataFactory::new_array<u1>(_loader_data,
3784 anno_length,
3785 CHECK_(annotations));
3786 for (int i = 0; i < anno_length; i++) {
3787 annotations->at_put(i, anno[i]);
3788 }
3789 }
3790 return annotations;
3791 }
3792
3793 void ClassFileParser::check_super_class(ConstantPool* const cp,
3794 const int super_class_index,
3795 const bool need_verify,
3796 TRAPS) {
3797 assert(cp != nullptr, "invariant");
3798
3799 if (super_class_index == 0) {
3800 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3801 "Invalid superclass index %u in class file %s",
3802 super_class_index,
3803 CHECK);
3804 } else {
3805 guarantee_property(valid_klass_reference_at(super_class_index),
3806 "Invalid superclass index %u in class file %s",
3807 super_class_index,
3808 CHECK);
3809
3810 // The class name should be legal because it is checked when parsing constant pool.
3811 // However, make sure it is not an array type.
3812 if (need_verify) {
3813 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3814 "Bad superclass name in class file %s", CHECK);
3815 }
3816 }
3817 }
3818
3819 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3820 _max_nonstatic_oop_maps = max_blocks;
3821 _nonstatic_oop_map_count = 0;
3822 if (max_blocks == 0) {
3974 // See documentation of InstanceKlass::can_be_fastpath_allocated().
3975 assert(ik->size_helper() > 0, "layout_helper is initialized");
3976 if (ik->is_abstract() || ik->is_interface()
3977 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3978 || ik->size_helper() >= FastAllocateSizeLimit) {
3979 // Forbid fast-path allocation.
3980 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3981 ik->set_layout_helper(lh);
3982 }
3983
3984 // Propagate the AOT runtimeSetup method discovery
3985 if (_has_aot_runtime_setup_method) {
3986 ik->set_is_runtime_setup_required();
3987 if (log_is_enabled(Info, aot, init)) {
3988 ResourceMark rm;
3989 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
3990 }
3991 }
3992 }
3993
3994 // utility methods for appending an array with check for duplicates
3995
3996 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
3997 const Array<InstanceKlass*>* const ifs) {
3998 // iterate over new interfaces
3999 for (int i = 0; i < ifs->length(); i++) {
4000 InstanceKlass* const e = ifs->at(i);
4001 assert(e->is_klass() && e->is_interface(), "just checking");
4002 // add new interface
4003 result->append_if_missing(e);
4004 }
4005 }
4006
4007 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4008 Array<InstanceKlass*>* local_ifs,
4009 ClassLoaderData* loader_data,
4010 TRAPS) {
4011 assert(local_ifs != nullptr, "invariant");
4012 assert(loader_data != nullptr, "invariant");
4013
4017 // Add superclass transitive interfaces size
4018 if (super != nullptr) {
4019 super_size = super->transitive_interfaces()->length();
4020 max_transitive_size += super_size;
4021 }
4022 // Add local interfaces' super interfaces
4023 const int local_size = local_ifs->length();
4024 for (int i = 0; i < local_size; i++) {
4025 InstanceKlass* const l = local_ifs->at(i);
4026 max_transitive_size += l->transitive_interfaces()->length();
4027 }
4028 // Finally add local interfaces
4029 max_transitive_size += local_size;
4030 // Construct array
4031 if (max_transitive_size == 0) {
4032 // no interfaces, use canonicalized array
4033 return Universe::the_empty_instance_klass_array();
4034 } else if (max_transitive_size == super_size) {
4035 // no new local interfaces added, share superklass' transitive interface array
4036 return super->transitive_interfaces();
4037 } else if (max_transitive_size == local_size) {
4038 // only local interfaces added, share local interface array
4039 return local_ifs;
4040 } else {
4041 ResourceMark rm;
4042 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4043
4044 // Copy down from superclass
4045 if (super != nullptr) {
4046 append_interfaces(result, super->transitive_interfaces());
4047 }
4048
4049 // Copy down from local interfaces' superinterfaces
4050 for (int i = 0; i < local_size; i++) {
4051 InstanceKlass* const l = local_ifs->at(i);
4052 append_interfaces(result, l->transitive_interfaces());
4053 }
4054 // Finally add local interfaces
4055 append_interfaces(result, local_ifs);
4056
4057 // length will be less than the max_transitive_size if duplicates were removed
4058 const int length = result->length();
4059 assert(length <= max_transitive_size, "just checking");
4060 Array<InstanceKlass*>* const new_result =
4061 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4062 for (int i = 0; i < length; i++) {
4063 InstanceKlass* const e = result->at(i);
4064 assert(e != nullptr, "just checking");
4065 new_result->at_put(i, e);
4066 }
4067 return new_result;
4068 }
4069 }
4070
4071 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4072 assert(this_klass != nullptr, "invariant");
4073 const InstanceKlass* const super = this_klass->super();
4074
4075 if (super != nullptr) {
4076 if (super->is_final()) {
4077 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4078 return;
4079 }
4080
4081 if (super->is_sealed()) {
4082 stringStream ss;
4083 ResourceMark rm(THREAD);
4084 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4085 classfile_icce_error(ss.as_string(), THREAD);
4086 return;
4087 }
4088 }
4089
4090 Reflection::VerifyClassAccessResults vca_result =
4091 Reflection::verify_class_access(this_klass, super, false);
4092 if (vca_result != Reflection::ACCESS_OK) {
4093 ResourceMark rm(THREAD);
4094 char* msg = Reflection::verify_class_access_msg(this_klass,
4095 super,
4096 vca_result);
4097
4098 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4099 if (msg == nullptr) {
4100 bool same_module = (this_klass->module() == super->module());
4101 Exceptions::fthrow(
4102 THREAD_AND_LOCATION,
4103 vmSymbols::java_lang_IllegalAccessError(),
4104 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4105 this_klass->external_name(),
4106 super->is_abstract() ? "abstract " : "",
4107 super->external_name(),
4108 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4109 (same_module) ? "" : "; ",
4262 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4263 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4264 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4265 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4266 if (is_module) {
4267 ResourceMark rm(THREAD);
4268 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4269 Exceptions::fthrow(
4270 THREAD_AND_LOCATION,
4271 vmSymbols::java_lang_NoClassDefFoundError(),
4272 "%s is not a class because access_flag ACC_MODULE is set",
4273 _class_name->as_C_string());
4274 return;
4275 }
4276
4277 if (!_need_verify) { return; }
4278
4279 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4280 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4281 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4282 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4283 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4284 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4285 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4286
4287 if ((is_abstract && is_final) ||
4288 (is_interface && !is_abstract) ||
4289 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4290 (!is_interface && major_gte_1_5 && is_annotation)) {
4291 ResourceMark rm(THREAD);
4292 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4293 if (inner_name == nullptr && !is_anonymous_inner_class) {
4294 Exceptions::fthrow(
4295 THREAD_AND_LOCATION,
4296 vmSymbols::java_lang_ClassFormatError(),
4297 "Illegal class modifiers in class %s: 0x%X",
4298 _class_name->as_C_string(), flags
4299 );
4300 } else {
4301 if (is_anonymous_inner_class) {
4302 Exceptions::fthrow(
4303 THREAD_AND_LOCATION,
4304 vmSymbols::java_lang_ClassFormatError(),
4305 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4306 _class_name->as_C_string(), flags
4307 );
4308 } else {
4309 Exceptions::fthrow(
4310 THREAD_AND_LOCATION,
4311 vmSymbols::java_lang_ClassFormatError(),
4365 THREAD_AND_LOCATION,
4366 vmSymbols::java_lang_UnsupportedClassVersionError(),
4367 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4368 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4369 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4370 return;
4371 }
4372
4373 if (!Arguments::enable_preview()) {
4374 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4375 class_name, major, minor, THREAD);
4376 return;
4377 }
4378
4379 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4380 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4381 class_name, major, minor, THREAD);
4382 }
4383 }
4384
4385 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4386 bool is_interface,
4387 TRAPS) const {
4388 if (!_need_verify) { return; }
4389
4390 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4391 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4392 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4393 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4394 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4395 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4396 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4397 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4398 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4399
4400 bool is_illegal = false;
4401
4402 if (is_interface) {
4403 if (!is_public || !is_static || !is_final || is_private ||
4404 is_protected || is_volatile || is_transient ||
4405 (major_gte_1_5 && is_enum)) {
4406 is_illegal = true;
4407 }
4408 } else { // not interface
4409 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4410 is_illegal = true;
4411 }
4412 }
4413
4414 if (is_illegal) {
4415 ResourceMark rm(THREAD);
4416 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4417 Exceptions::fthrow(
4418 THREAD_AND_LOCATION,
4419 vmSymbols::java_lang_ClassFormatError(),
4420 "Illegal field modifiers in class %s: 0x%X",
4421 _class_name->as_C_string(), flags);
4422 return;
4423 }
4424 }
4425
4426 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4427 bool is_interface,
4428 const Symbol* name,
4429 TRAPS) const {
4430 if (!_need_verify) { return; }
4431
4432 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4433 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4434 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4435 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4436 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4437 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4438 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4439 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4440 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4441 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4442 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4443 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4444 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4445 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4446
4447 bool is_illegal = false;
4448
4449 if (is_interface) {
4450 if (major_gte_8) {
4451 // Class file version is JAVA_8_VERSION or later Methods of
4452 // interfaces may set any of the flags except ACC_PROTECTED,
4453 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4454 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4455 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4456 (is_native || is_protected || is_final || is_synchronized) ||
4457 // If a specific method of a class or interface has its
4458 // ACC_ABSTRACT flag set, it must not have any of its
4459 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4460 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4461 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4462 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4463 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4464 is_illegal = true;
4465 }
4466 } else if (major_gte_1_5) {
4467 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4468 if (!is_public || is_private || is_protected || is_static || is_final ||
4469 is_synchronized || is_native || !is_abstract || is_strict) {
4470 is_illegal = true;
4471 }
4472 } else {
4473 // Class file version is pre-JAVA_1_5_VERSION
4474 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4475 is_illegal = true;
4476 }
4477 }
4478 } else { // not interface
4479 if (has_illegal_visibility(flags)) {
4480 is_illegal = true;
4481 } else {
4482 if (is_initializer) {
4483 if (is_static || is_final || is_synchronized || is_native ||
4484 is_abstract || (major_gte_1_5 && is_bridge)) {
4485 is_illegal = true;
4486 }
4487 } else { // not initializer
4488 if (is_abstract) {
4489 if ((is_final || is_native || is_private || is_static ||
4490 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4491 is_illegal = true;
4492 }
4493 }
4494 }
4495 }
4496 }
4497
4498 if (is_illegal) {
4499 ResourceMark rm(THREAD);
4500 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4501 Exceptions::fthrow(
4502 THREAD_AND_LOCATION,
4503 vmSymbols::java_lang_ClassFormatError(),
4504 "Method %s in class %s has illegal modifiers: 0x%X",
4505 name->as_C_string(), _class_name->as_C_string(), flags);
4506 return;
4507 }
4508 }
4509
4510 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4511 int length,
4512 TRAPS) const {
4513 assert(_need_verify, "only called when _need_verify is true");
4514 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4515 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4516 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4517 }
4518 }
4519
4520 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4521 // In class names, '/' separates unqualified names. This is verified in this function also.
4522 // Method names also may not contain the characters '<' or '>', unless <init>
4523 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4524 // method. Because these names have been checked as special cases before
4525 // calling this method in verify_legal_method_name.
4543 if (type == ClassFileParser::LegalClass) {
4544 if (p == name || p+1 >= name+length ||
4545 *(p+1) == JVM_SIGNATURE_SLASH) {
4546 return false;
4547 }
4548 } else {
4549 return false; // do not permit '/' unless it's class name
4550 }
4551 break;
4552 case JVM_SIGNATURE_SPECIAL:
4553 case JVM_SIGNATURE_ENDSPECIAL:
4554 // do not permit '<' or '>' in method names
4555 if (type == ClassFileParser::LegalMethod) {
4556 return false;
4557 }
4558 }
4559 }
4560 return true;
4561 }
4562
4563 // Take pointer to a UTF8 byte string (not NUL-terminated).
4564 // Skip over the longest part of the string that could
4565 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4566 // Return a pointer to just past the fieldname.
4567 // Return null if no fieldname at all was found, or in the case of slash_ok
4568 // being true, we saw consecutive slashes (meaning we were looking for a
4569 // qualified path but found something that was badly-formed).
4570 static const char* skip_over_field_name(const char* const name,
4571 bool slash_ok,
4572 unsigned int length) {
4573 const char* p;
4574 jboolean last_is_slash = false;
4575 jboolean not_first_ch = false;
4576
4577 for (p = name; p != name + length; not_first_ch = true) {
4578 const char* old_p = p;
4579 jchar ch = *p;
4580 if (ch < 128) {
4581 p++;
4582 // quick check for ascii
4644 // be taken as a field signature. Allow "void" if void_ok.
4645 // Return a pointer to just past the signature.
4646 // Return null if no legal signature is found.
4647 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4648 bool void_ok,
4649 unsigned int length,
4650 TRAPS) const {
4651 unsigned int array_dim = 0;
4652 while (length > 0) {
4653 switch (signature[0]) {
4654 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4655 case JVM_SIGNATURE_BOOLEAN:
4656 case JVM_SIGNATURE_BYTE:
4657 case JVM_SIGNATURE_CHAR:
4658 case JVM_SIGNATURE_SHORT:
4659 case JVM_SIGNATURE_INT:
4660 case JVM_SIGNATURE_FLOAT:
4661 case JVM_SIGNATURE_LONG:
4662 case JVM_SIGNATURE_DOUBLE:
4663 return signature + 1;
4664 case JVM_SIGNATURE_CLASS: {
4665 if (_major_version < JAVA_1_5_VERSION) {
4666 signature++;
4667 length--;
4668 // Skip over the class name if one is there
4669 const char* const p = skip_over_field_name(signature, true, length);
4670 assert(p == nullptr || p > signature, "must parse one character at least");
4671 // The next character better be a semicolon
4672 if (p != nullptr && // Parse of field name succeeded.
4673 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4674 p[0] == JVM_SIGNATURE_ENDCLASS) {
4675 return p + 1;
4676 }
4677 }
4678 else {
4679 // Skip leading 'L' and ignore first appearance of ';'
4680 signature++;
4681 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4682 // Format check signature
4683 if (c != nullptr) {
4684 int newlen = pointer_delta_as_int(c, (char*) signature);
4685 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4686 if (!legal) {
4687 classfile_parse_error("Class name is empty or contains illegal character "
4688 "in descriptor in class file %s",
4689 THREAD);
4690 return nullptr;
4691 }
4692 return signature + newlen + 1;
4693 }
4694 }
4695 return nullptr;
4696 }
4697 case JVM_SIGNATURE_ARRAY:
4698 array_dim++;
4699 if (array_dim > 255) {
4715
4716 // Checks if name is a legal class name.
4717 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4718 if (!_need_verify) { return; }
4719
4720 assert(name->refcount() > 0, "symbol must be kept alive");
4721 char* bytes = (char*)name->bytes();
4722 unsigned int length = name->utf8_length();
4723 bool legal = false;
4724
4725 if (length > 0) {
4726 const char* p;
4727 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4728 p = skip_over_field_signature(bytes, false, length, CHECK);
4729 legal = (p != nullptr) && ((p - bytes) == (int)length);
4730 } else if (_major_version < JAVA_1_5_VERSION) {
4731 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4732 p = skip_over_field_name(bytes, true, length);
4733 legal = (p != nullptr) && ((p - bytes) == (int)length);
4734 }
4735 } else {
4736 // 4900761: relax the constraints based on JSR202 spec
4737 // Class names may be drawn from the entire Unicode character set.
4738 // Identifiers between '/' must be unqualified names.
4739 // The utf8 string has been verified when parsing cpool entries.
4740 legal = verify_unqualified_name(bytes, length, LegalClass);
4741 }
4742 }
4743 if (!legal) {
4744 ResourceMark rm(THREAD);
4745 assert(_class_name != nullptr, "invariant");
4746 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4747 Exceptions::fthrow(
4748 THREAD_AND_LOCATION,
4749 vmSymbols::java_lang_ClassFormatError(),
4750 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4751 _class_name->as_C_string()
4752 );
4753 return;
4754 }
4782 THREAD_AND_LOCATION,
4783 vmSymbols::java_lang_ClassFormatError(),
4784 "Illegal field name \"%.*s\" in class %s", length, bytes,
4785 _class_name->as_C_string()
4786 );
4787 return;
4788 }
4789 }
4790
4791 // Checks if name is a legal method name.
4792 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4793 if (!_need_verify) { return; }
4794
4795 assert(name != nullptr, "method name is null");
4796 char* bytes = (char*)name->bytes();
4797 unsigned int length = name->utf8_length();
4798 bool legal = false;
4799
4800 if (length > 0) {
4801 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4802 if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4803 legal = true;
4804 }
4805 } else if (_major_version < JAVA_1_5_VERSION) {
4806 const char* p;
4807 p = skip_over_field_name(bytes, false, length);
4808 legal = (p != nullptr) && ((p - bytes) == (int)length);
4809 } else {
4810 // 4881221: relax the constraints based on JSR202 spec
4811 legal = verify_unqualified_name(bytes, length, LegalMethod);
4812 }
4813 }
4814
4815 if (!legal) {
4816 ResourceMark rm(THREAD);
4817 assert(_class_name != nullptr, "invariant");
4818 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4819 Exceptions::fthrow(
4820 THREAD_AND_LOCATION,
4821 vmSymbols::java_lang_ClassFormatError(),
4822 "Illegal method name \"%.*s\" in class %s", length, bytes,
4823 _class_name->as_C_string()
4824 );
4825 return;
4826 }
4827 }
4828
4829
4830 // Checks if signature is a legal field signature.
4831 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4832 const Symbol* signature,
4833 TRAPS) const {
4834 if (!_need_verify) { return; }
4835
4836 const char* const bytes = (const char*)signature->bytes();
4837 const unsigned int length = signature->utf8_length();
4838 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4839
4840 if (p == nullptr || (p - bytes) != (int)length) {
4841 throwIllegalSignature("Field", name, signature, CHECK);
4842 }
4843 }
4844
4845 // Check that the signature is compatible with the method name. For example,
4846 // check that <init> has a void signature.
4847 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4848 const Symbol* signature,
4849 TRAPS) const {
4850 if (!_need_verify) {
4851 return;
4852 }
4853
4854 // Class initializers cannot have args for class format version >= 51.
4855 if (name == vmSymbols::class_initializer_name() &&
4856 signature != vmSymbols::void_method_signature() &&
4857 _major_version >= JAVA_7_VERSION) {
4858 throwIllegalSignature("Method", name, signature, THREAD);
4859 return;
4860 }
4861
4862 int sig_length = signature->utf8_length();
4863 if (name->utf8_length() > 0 &&
4864 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4865 sig_length > 0 &&
4866 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4867 throwIllegalSignature("Method", name, signature, THREAD);
4868 }
4869 }
4870
4871 // Checks if signature is a legal method signature.
4872 // Returns number of parameters
4873 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
4874 const Symbol* signature,
4875 TRAPS) const {
4876 if (!_need_verify) {
4877 // make sure caller's args_size will be less than 0 even for non-static
4878 // method so it will be recomputed in compute_size_of_parameters().
4879 return -2;
4880 }
4881
4882 unsigned int args_size = 0;
4883 const char* p = (const char*)signature->bytes();
4884 unsigned int length = signature->utf8_length();
4885 const char* nextp;
4886
4897 length -= pointer_delta_as_int(nextp, p);
4898 p = nextp;
4899 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4900 }
4901 // The first non-signature thing better be a ')'
4902 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4903 length--;
4904 // Now we better just have a return value
4905 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4906 if (nextp && ((int)length == (nextp - p))) {
4907 return args_size;
4908 }
4909 }
4910 }
4911 // Report error
4912 throwIllegalSignature("Method", name, signature, THREAD);
4913 return 0;
4914 }
4915
4916 int ClassFileParser::static_field_size() const {
4917 assert(_field_info != nullptr, "invariant");
4918 return _field_info->_static_field_size;
4919 }
4920
4921 int ClassFileParser::total_oop_map_count() const {
4922 assert(_field_info != nullptr, "invariant");
4923 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4924 }
4925
4926 jint ClassFileParser::layout_size() const {
4927 assert(_field_info != nullptr, "invariant");
4928 return _field_info->_instance_size;
4929 }
4930
4931 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4932 const Array<Method*>* methods) {
4933 assert(ik != nullptr, "invariant");
4934 assert(methods != nullptr, "invariant");
4935
4936 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4937 // (We used to do this lazily, but now we query it in Rewriter,
4938 // which is eagerly done for every method, so we might as well do it now,
4939 // when everything is fresh in memory.)
4940 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4941
4942 if (klass_id != vmSymbolID::NO_SID) {
4943 for (int j = 0; j < methods->length(); ++j) {
4944 Method* method = methods->at(j);
4945 method->init_intrinsic_id(klass_id);
4946
4947 if (CheckIntrinsics) {
4948 // Check if an intrinsic is defined for method 'method',
5023 }
5024 }
5025
5026 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5027 const ClassInstanceInfo& cl_inst_info,
5028 TRAPS) {
5029 if (_klass != nullptr) {
5030 return _klass;
5031 }
5032
5033 InstanceKlass* const ik =
5034 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5035
5036 if (is_hidden()) {
5037 mangle_hidden_class_name(ik);
5038 }
5039
5040 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5041
5042 assert(_klass == ik, "invariant");
5043
5044 return ik;
5045 }
5046
5047 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5048 bool changed_by_loadhook,
5049 const ClassInstanceInfo& cl_inst_info,
5050 TRAPS) {
5051 assert(ik != nullptr, "invariant");
5052
5053 // Set name and CLD before adding to CLD
5054 ik->set_class_loader_data(_loader_data);
5055 ik->set_class_loader_type();
5056 ik->set_name(_class_name);
5057
5058 // Add all classes to our internal class loader list here,
5059 // including classes in the bootstrap (null) class loader.
5060 const bool publicize = !is_internal();
5061
5062 _loader_data->add_class(ik, publicize);
5063
5064 set_klass_to_deallocate(ik);
5065
5066 assert(_field_info != nullptr, "invariant");
5067 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5068 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5069 "sanity");
5070
5071 assert(ik->is_instance_klass(), "sanity");
5072 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5073
5074 // Fill in information already parsed
5075 ik->set_should_verify_class(_need_verify);
5076
5077 // Not yet: supers are done below to support the new subtype-checking fields
5078 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5079 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5080 ik->set_static_oop_field_count(_static_oop_count);
5081
5082 // this transfers ownership of a lot of arrays from
5083 // the parser onto the InstanceKlass*
5084 apply_parsed_class_metadata(ik, _java_fields_count);
5085
5086 // can only set dynamic nest-host after static nest information is set
5087 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5088 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5089 }
5090
5091 // note that is not safe to use the fields in the parser from this point on
5092 assert(nullptr == _cp, "invariant");
5093 assert(nullptr == _fieldinfo_stream, "invariant");
5094 assert(nullptr == _fieldinfo_search_table, "invariant");
5095 assert(nullptr == _fields_status, "invariant");
5096 assert(nullptr == _methods, "invariant");
5097 assert(nullptr == _inner_classes, "invariant");
5098 assert(nullptr == _nest_members, "invariant");
5099 assert(nullptr == _combined_annotations, "invariant");
5100 assert(nullptr == _record_components, "invariant");
5101 assert(nullptr == _permitted_subclasses, "invariant");
5102
5103 if (_has_localvariable_table) {
5104 ik->set_has_localvariable_table(true);
5105 }
5106
5107 if (_has_final_method) {
5108 ik->set_has_final_method();
5109 }
5110
5111 ik->copy_method_ordering(_method_ordering, CHECK);
5112 // The InstanceKlass::_methods_jmethod_ids cache
5113 // is managed on the assumption that the initial cache
5114 // size is equal to the number of methods in the class. If
5115 // that changes, then InstanceKlass::idnum_can_increment()
5116 // has to be changed accordingly.
5117 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5118
5119 ik->set_this_class_index(_this_class_index);
5120
5121 if (_is_hidden) {
5158 if ((_num_miranda_methods > 0) ||
5159 // if this class introduced new miranda methods or
5160 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5161 // super class exists and this class inherited miranda methods
5162 ) {
5163 ik->set_has_miranda_methods(); // then set a flag
5164 }
5165
5166 // Fill in information needed to compute superclasses.
5167 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5168 ik->set_transitive_interfaces(_transitive_interfaces);
5169 ik->set_local_interfaces(_local_interfaces);
5170 _transitive_interfaces = nullptr;
5171 _local_interfaces = nullptr;
5172
5173 // Initialize itable offset tables
5174 klassItable::setup_itable_offset_table(ik);
5175
5176 // Compute transitive closure of interfaces this class implements
5177 // Do final class setup
5178 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5179 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5180 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5181 }
5182
5183 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5184 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5185 ik->set_has_contended_annotations(true);
5186 }
5187
5188 // Fill in has_finalizer and layout_helper
5189 set_precomputed_flags(ik);
5190
5191 // check if this class can access its super class
5192 check_super_class_access(ik, CHECK);
5193
5194 // check if this class can access its superinterfaces
5195 check_super_interface_access(ik, CHECK);
5196
5197 // check if this class overrides any final method
5198 check_final_method_override(ik, CHECK);
5219
5220 assert(_all_mirandas != nullptr, "invariant");
5221
5222 // Generate any default methods - default methods are public interface methods
5223 // that have a default implementation. This is new with Java 8.
5224 if (_has_nonstatic_concrete_methods) {
5225 DefaultMethods::generate_default_methods(ik,
5226 _all_mirandas,
5227 CHECK);
5228 }
5229
5230 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5231 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5232 !module_entry->has_default_read_edges()) {
5233 if (!module_entry->set_has_default_read_edges()) {
5234 // We won a potential race
5235 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5236 }
5237 }
5238
5239 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5240
5241 if (!is_internal()) {
5242 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5243
5244 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5245 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5246 log_is_enabled(Info, class, preview)) {
5247 ResourceMark rm;
5248 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5249 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5250 }
5251
5252 if (log_is_enabled(Debug, class, resolve)) {
5253 ResourceMark rm;
5254 // print out the superclass.
5255 const char * from = ik->external_name();
5256 if (ik->super() != nullptr) {
5257 log_debug(class, resolve)("%s %s (super)",
5258 from,
5299 const ClassLoadInfo* cl_info,
5300 Publicity pub_level,
5301 TRAPS) :
5302 _stream(stream),
5303 _class_name(nullptr),
5304 _loader_data(loader_data),
5305 _is_hidden(cl_info->is_hidden()),
5306 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5307 _orig_cp_size(0),
5308 _static_oop_count(0),
5309 _super_klass(),
5310 _cp(nullptr),
5311 _fieldinfo_stream(nullptr),
5312 _fieldinfo_search_table(nullptr),
5313 _fields_status(nullptr),
5314 _methods(nullptr),
5315 _inner_classes(nullptr),
5316 _nest_members(nullptr),
5317 _nest_host(0),
5318 _permitted_subclasses(nullptr),
5319 _record_components(nullptr),
5320 _local_interfaces(nullptr),
5321 _transitive_interfaces(nullptr),
5322 _combined_annotations(nullptr),
5323 _class_annotations(nullptr),
5324 _class_type_annotations(nullptr),
5325 _fields_annotations(nullptr),
5326 _fields_type_annotations(nullptr),
5327 _klass(nullptr),
5328 _klass_to_deallocate(nullptr),
5329 _parsed_annotations(nullptr),
5330 _field_info(nullptr),
5331 _temp_field_info(nullptr),
5332 _method_ordering(nullptr),
5333 _all_mirandas(nullptr),
5334 _vtable_size(0),
5335 _itable_size(0),
5336 _num_miranda_methods(0),
5337 _protection_domain(cl_info->protection_domain()),
5338 _access_flags(),
5339 _pub_level(pub_level),
5340 _bad_constant_seen(0),
5341 _synthetic_flag(false),
5342 _sde_length(false),
5343 _sde_buffer(nullptr),
5344 _sourcefile_index(0),
5345 _generic_signature_index(0),
5346 _major_version(0),
5347 _minor_version(0),
5348 _this_class_index(0),
5349 _super_class_index(0),
5350 _itfs_len(0),
5351 _java_fields_count(0),
5352 _need_verify(false),
5353 _has_nonstatic_concrete_methods(false),
5354 _declares_nonstatic_concrete_methods(false),
5355 _has_localvariable_table(false),
5356 _has_final_method(false),
5357 _has_contended_fields(false),
5358 _has_aot_runtime_setup_method(false),
5359 _has_finalizer(false),
5360 _has_empty_finalizer(false),
5361 _max_bootstrap_specifier_index(-1) {
5362
5363 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5364 _class_name->increment_refcount();
5365
5366 assert(_loader_data != nullptr, "invariant");
5367 assert(stream != nullptr, "invariant");
5368 assert(_stream != nullptr, "invariant");
5369 assert(_stream->buffer() == _stream->current(), "invariant");
5370 assert(_class_name != nullptr, "invariant");
5371 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5372
5373 // Figure out whether we can skip format checking (matching classic VM behavior)
5374 // Always verify CFLH bytes from the user agents.
5375 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5376
5377 // synch back verification state to stream to check for truncation.
5378 stream->set_need_verify(_need_verify);
5379
5380 parse_stream(stream, CHECK);
5381
5382 post_process_parsed_stream(stream, _cp, CHECK);
5383 }
5384
5385 void ClassFileParser::clear_class_metadata() {
5386 // metadata created before the instance klass is created. Must be
5387 // deallocated if classfile parsing returns an error.
5388 _cp = nullptr;
5389 _fieldinfo_stream = nullptr;
5390 _fieldinfo_search_table = nullptr;
5391 _fields_status = nullptr;
5392 _methods = nullptr;
5393 _inner_classes = nullptr;
5394 _nest_members = nullptr;
5395 _permitted_subclasses = nullptr;
5396 _combined_annotations = nullptr;
5397 _class_annotations = _class_type_annotations = nullptr;
5398 _fields_annotations = _fields_type_annotations = nullptr;
5399 _record_components = nullptr;
5400 }
5401
5402 // Destructor to clean up
5403 ClassFileParser::~ClassFileParser() {
5404 _class_name->decrement_refcount();
5405
5406 if (_cp != nullptr) {
5407 MetadataFactory::free_metadata(_loader_data, _cp);
5408 }
5409
5410 if (_fieldinfo_stream != nullptr) {
5411 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5412 }
5413 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5414
5415 if (_fields_status != nullptr) {
5416 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5417 }
5418
5419 if (_methods != nullptr) {
5420 // Free methods
5421 InstanceKlass::deallocate_methods(_loader_data, _methods);
5422 }
5423
5424 // beware of the Universe::empty_blah_array!!
5425 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5426 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5427 }
5428
5429 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5430 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5431 }
5432
5433 if (_record_components != nullptr) {
5434 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5435 }
5436
5437 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5438 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5439 }
5440
5441 // Free interfaces
5442 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5443 _local_interfaces, _transitive_interfaces);
5444
5445 if (_combined_annotations != nullptr) {
5446 // After all annotations arrays have been created, they are installed into the
5447 // Annotations object that will be assigned to the InstanceKlass being created.
5448
5449 // Deallocate the Annotations object and the installed annotations arrays.
5450 _combined_annotations->deallocate_contents(_loader_data);
5451
5452 // If the _combined_annotations pointer is non-null,
5453 // then the other annotations fields should have been cleared.
5454 assert(_class_annotations == nullptr, "Should have been cleared");
5455 assert(_class_type_annotations == nullptr, "Should have been cleared");
5456 assert(_fields_annotations == nullptr, "Should have been cleared");
5457 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5458 } else {
5459 // If the annotations arrays were not installed into the Annotations object,
5460 // then they have to be deallocated explicitly.
5520
5521 assert(cp_size == (u2)cp->length(), "invariant");
5522
5523 // ACCESS FLAGS
5524 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5525
5526 // Access flags
5527 u2 flags;
5528 // JVM_ACC_MODULE is defined in JDK-9 and later.
5529 if (_major_version >= JAVA_9_VERSION) {
5530 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5531 } else {
5532 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5533 }
5534
5535 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5536 // Set abstract bit for old class files for backward compatibility
5537 flags |= JVM_ACC_ABSTRACT;
5538 }
5539
5540 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5541
5542 short bad_constant = class_bad_constant_seen();
5543 if (bad_constant != 0) {
5544 // Do not throw CFE until after the access_flags are checked because if
5545 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5546 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5547 return;
5548 }
5549
5550 _access_flags.set_flags(flags);
5551
5552 // This class and superclass
5553 _this_class_index = stream->get_u2_fast();
5554 guarantee_property(
5555 valid_cp_range(_this_class_index, cp_size) &&
5556 cp->tag_at(_this_class_index).is_unresolved_klass(),
5557 "Invalid this class index %u in constant pool in class file %s",
5558 _this_class_index, CHECK);
5559
5623 }
5624 ls.cr();
5625 }
5626 }
5627
5628 // SUPERKLASS
5629 _super_class_index = stream->get_u2_fast();
5630 check_super_class(cp,
5631 _super_class_index,
5632 _need_verify,
5633 CHECK);
5634
5635 // Interfaces
5636 _itfs_len = stream->get_u2_fast();
5637 parse_interfaces(stream,
5638 _itfs_len,
5639 cp,
5640 &_has_nonstatic_concrete_methods,
5641 CHECK);
5642
5643 assert(_local_interfaces != nullptr, "invariant");
5644
5645 // Fields (offsets are filled in later)
5646 parse_fields(stream,
5647 _access_flags.is_interface(),
5648 cp,
5649 cp_size,
5650 &_java_fields_count,
5651 CHECK);
5652
5653 assert(_temp_field_info != nullptr, "invariant");
5654
5655 // Methods
5656 parse_methods(stream,
5657 _access_flags.is_interface(),
5658 &_has_localvariable_table,
5659 &_has_final_method,
5660 &_declares_nonstatic_concrete_methods,
5661 CHECK);
5662
5663 assert(_methods != nullptr, "invariant");
5664
5665 if (_declares_nonstatic_concrete_methods) {
5666 _has_nonstatic_concrete_methods = true;
5667 }
5668
5669 // Additional attributes/annotations
5670 _parsed_annotations = new ClassAnnotationCollector();
5671 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5672
5673 assert(_inner_classes != nullptr, "invariant");
5674
5675 // Finalize the Annotations metadata object,
5676 // now that all annotation arrays have been created.
5677 create_combined_annotations(CHECK);
5725 }
5726
5727 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5728 ConstantPool* cp,
5729 TRAPS) {
5730 assert(stream != nullptr, "invariant");
5731 assert(stream->at_eos(), "invariant");
5732 assert(cp != nullptr, "invariant");
5733 assert(_loader_data != nullptr, "invariant");
5734
5735 if (_class_name == vmSymbols::java_lang_Object()) {
5736 precond(_super_class_index == 0);
5737 precond(_super_klass == nullptr);
5738 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5739 "java.lang.Object cannot implement an interface in class file %s",
5740 CHECK);
5741 } else {
5742 // Set _super_klass after class file is parsed and format is checked
5743 assert(_super_class_index > 0, "any class other than Object must have a super class");
5744 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5745 if (_access_flags.is_interface()) {
5746 // Before attempting to resolve the superclass, check for class format
5747 // errors not checked yet.
5748 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5749 "Interfaces must have java.lang.Object as superclass in class file %s",
5750 CHECK);
5751 }
5752 Handle loader(THREAD, _loader_data->class_loader());
5753 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5754 // fast path to avoid lookup
5755 _super_klass = vmClasses::Object_klass();
5756 } else {
5757 _super_klass = (const InstanceKlass*)
5758 SystemDictionary::resolve_super_or_fail(_class_name,
5759 super_class_name,
5760 loader,
5761 true,
5762 CHECK);
5763 }
5764 }
5765
5766 if (_super_klass != nullptr) {
5767 if (_super_klass->has_nonstatic_concrete_methods()) {
5768 _has_nonstatic_concrete_methods = true;
5769 }
5770
5771 if (_super_klass->is_interface()) {
5772 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5773 return;
5774 }
5775 }
5776
5777 // Compute the transitive list of all unique interfaces implemented by this class
5778 _transitive_interfaces =
5779 compute_transitive_interfaces(_super_klass,
5780 _local_interfaces,
5781 _loader_data,
5782 CHECK);
5783
5784 assert(_transitive_interfaces != nullptr, "invariant");
5785
5786 // sort methods
5787 _method_ordering = sort_methods(_methods);
5788
5789 _all_mirandas = new GrowableArray<Method*>(20);
5790
5791 Handle loader(THREAD, _loader_data->class_loader());
5792 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5793 &_num_miranda_methods,
5794 _all_mirandas,
5795 _super_klass,
5796 _methods,
5797 _access_flags,
5798 _major_version,
5799 loader,
5800 _class_name,
5801 _local_interfaces);
5802
5803 // Size of Java itable (in words)
5804 _itable_size = _access_flags.is_interface() ? 0 :
5805 klassItable::compute_itable_size(_transitive_interfaces);
5806
5807 assert(_parsed_annotations != nullptr, "invariant");
5808
5809 _field_info = new FieldLayoutInfo();
5810 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5811 _parsed_annotations->is_contended(), _field_info);
5812 lb.build_layout();
5813
5814 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5815 _fieldinfo_stream =
5816 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5817 injected_fields_count, loader_data(), CHECK);
5818 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
5819 _fields_status =
5820 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5821 FieldStatus(0), CHECK);
5822 }
5823
5824 void ClassFileParser::set_klass(InstanceKlass* klass) {
5825
5826 #ifdef ASSERT
5827 if (klass != nullptr) {
5828 assert(nullptr == _klass, "leaking?");
5829 }
5830 #endif
5831
5832 _klass = klass;
5833 }
5834
5835 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5836
5837 #ifdef ASSERT
5838 if (klass != nullptr) {
5839 assert(nullptr == _klass_to_deallocate, "leaking?");
5840 }
5841 #endif
5842
5843 _klass_to_deallocate = klass;
5844 }
5845
5846 // Caller responsible for ResourceMark
5847 // clone stream with rewound position
5848 const ClassFileStream* ClassFileParser::clone_stream() const {
5849 assert(_stream != nullptr, "invariant");
5850
5851 return _stream->clone();
5852 }
5853
5854 ReferenceType ClassFileParser::super_reference_type() const {
|
1 /*
2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cdsConfig.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/classLoadInfo.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/fieldLayoutBuilder.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "jvm.h"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/bsmAttribute.inline.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/inlineKlass.inline.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/klassVtable.hpp"
60 #include "oops/metadata.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiThreadState.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/fieldDescriptor.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/safepointVerifiers.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/timer.hpp"
77 #include "services/classLoadingService.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/bitMap.inline.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/exceptions.hpp"
84 #include "utilities/formatBuffer.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/hashTable.hpp"
88 #include "utilities/macros.hpp"
89 #include "utilities/ostream.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95
96 // We generally try to create the oops directly when parsing, rather than
97 // allocating temporary data structures and copying the bytes twice. A
98 // temporary area is only needed when parsing utf8 entries in the constant
99 // pool and when parsing line number tables.
100
101 // We add assert in debug mode when class format is not checked.
102
103 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
104 #define JAVA_MIN_SUPPORTED_VERSION 45
105 #define JAVA_PREVIEW_MINOR_VERSION 65535
106
107 // Used for two backward compatibility reasons:
108 // - to check for new additions to the class file format in JDK1.5
109 // - to check for bug fixes in the format checker in JDK1.5
110 #define JAVA_1_5_VERSION 49
142 #define JAVA_18_VERSION 62
143
144 #define JAVA_19_VERSION 63
145
146 #define JAVA_20_VERSION 64
147
148 #define JAVA_21_VERSION 65
149
150 #define JAVA_22_VERSION 66
151
152 #define JAVA_23_VERSION 67
153
154 #define JAVA_24_VERSION 68
155
156 #define JAVA_25_VERSION 69
157
158 #define JAVA_26_VERSION 70
159
160 #define JAVA_27_VERSION 71
161
162 #define CONSTANT_CLASS_DESCRIPTORS 71
163
164 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
165 assert((bad_constant == JVM_CONSTANT_Module ||
166 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
167 "Unexpected bad constant pool entry");
168 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
169 }
170
171 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
172 ConstantPool* cp,
173 const int length,
174 TRAPS) {
175 assert(stream != nullptr, "invariant");
176 assert(cp != nullptr, "invariant");
177
178 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
179 // this function (_current can be allocated in a register, with scalar
180 // replacement of aggregates). The _current pointer is copied back to
181 // stream() when this function returns. DON'T call another method within
182 // this method that uses stream().
183 const ClassFileStream cfs1 = *stream;
184 const ClassFileStream* const cfs = &cfs1;
185
186 DEBUG_ONLY(const u1* const old_current = stream->current();)
187
188 // Used for batching symbol allocations.
189 const char* names[SymbolTable::symbol_alloc_batch_size];
190 int lengths[SymbolTable::symbol_alloc_batch_size];
191 int indices[SymbolTable::symbol_alloc_batch_size];
192 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
193 int names_count = 0;
194
195 // parsing Index 0 is unused
196 for (int index = 1; index < length; index++) {
197 // Each of the following case guarantees one more byte in the stream
198 // for the following tag or the access_flags following constant pool,
199 // so we don't need bounds-check for reading tag.
200 const u1 tag = cfs->get_u1_fast();
201 switch (tag) {
202 case JVM_CONSTANT_Class: {
203 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
204 const u2 name_index = cfs->get_u2_fast();
205 cp->klass_index_at_put(index, name_index);
206 break;
207 }
208 case JVM_CONSTANT_Fieldref: {
209 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
210 const u2 class_index = cfs->get_u2_fast();
211 const u2 name_and_type_index = cfs->get_u2_fast();
212 cp->field_at_put(index, class_index, name_and_type_index);
213 break;
214 }
215 case JVM_CONSTANT_Methodref: {
216 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
217 const u2 class_index = cfs->get_u2_fast();
218 const u2 name_and_type_index = cfs->get_u2_fast();
219 cp->method_at_put(index, class_index, name_and_type_index);
220 break;
221 }
222 case JVM_CONSTANT_InterfaceMethodref: {
486 guarantee_property(valid_symbol_at(name_ref_index),
487 "Invalid constant pool index %u in class file %s",
488 name_ref_index, CHECK);
489 guarantee_property(valid_symbol_at(signature_ref_index),
490 "Invalid constant pool index %u in class file %s",
491 signature_ref_index, CHECK);
492 break;
493 }
494 case JVM_CONSTANT_Utf8:
495 break;
496 case JVM_CONSTANT_UnresolvedClass: // fall-through
497 case JVM_CONSTANT_UnresolvedClassInError: {
498 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
499 break;
500 }
501 case JVM_CONSTANT_ClassIndex: {
502 const int class_index = cp->klass_index_at(index);
503 guarantee_property(valid_symbol_at(class_index),
504 "Invalid constant pool index %u in class file %s",
505 class_index, CHECK);
506
507 Symbol* const name = cp->symbol_at(class_index);
508 const unsigned int name_len = name->utf8_length();
509 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
510 break;
511 }
512 case JVM_CONSTANT_StringIndex: {
513 const int string_index = cp->string_index_at(index);
514 guarantee_property(valid_symbol_at(string_index),
515 "Invalid constant pool index %u in class file %s",
516 string_index, CHECK);
517 Symbol* const sym = cp->symbol_at(string_index);
518 cp->unresolved_string_at_put(index, sym);
519 break;
520 }
521 case JVM_CONSTANT_MethodHandle: {
522 const int ref_index = cp->method_handle_index_at(index);
523 guarantee_property(valid_cp_range(ref_index, length),
524 "Invalid constant pool index %u in class file %s",
525 ref_index, CHECK);
526 const constantTag tag = cp->tag_at(ref_index);
527 const int ref_kind = cp->method_handle_ref_kind_at(index);
528
698 }
699 }
700 } else {
701 if (_need_verify) {
702 // Method name and signature are individually verified above, when iterating
703 // NameAndType_info. Need to check here that signature is non-zero length and
704 // the right type.
705 if (!Signature::is_method(signature)) {
706 throwIllegalSignature("Method", name, signature, CHECK);
707 }
708 }
709 // If a class method name begins with '<', it must be "<init>" and have void signature.
710 const unsigned int name_len = name->utf8_length();
711 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
712 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
713 if (name != vmSymbols::object_initializer_name()) {
714 classfile_parse_error(
715 "Bad method name at constant pool index %u in class file %s",
716 name_ref_index, THREAD);
717 return;
718 } else if (!Signature::is_void_method(signature)) { // must have void signature.
719 throwIllegalSignature("Method", name, signature, CHECK);
720 }
721 }
722 }
723 break;
724 }
725 case JVM_CONSTANT_MethodHandle: {
726 const int ref_index = cp->method_handle_index_at(index);
727 const int ref_kind = cp->method_handle_ref_kind_at(index);
728 switch (ref_kind) {
729 case JVM_REF_invokeVirtual:
730 case JVM_REF_invokeStatic:
731 case JVM_REF_invokeSpecial:
732 case JVM_REF_newInvokeSpecial: {
733 const int name_and_type_ref_index =
734 cp->uncached_name_and_type_ref_index_at(ref_index);
735 const int name_ref_index =
736 cp->name_ref_index_at(name_and_type_ref_index);
737 const Symbol* const name = cp->symbol_at(name_ref_index);
738
739 if (name != vmSymbols::object_initializer_name()) { // !<init>
740 if (ref_kind == JVM_REF_newInvokeSpecial) {
741 classfile_parse_error(
742 "Bad constructor name at constant pool index %u in class file %s",
743 name_ref_index, THREAD);
744 return;
745 }
746 } else { // <init>
747 // The allowed invocation mode of <init> depends on its signature.
748 // This test corresponds to verify_invoke_instructions in the verifier.
749 const int signature_ref_index =
750 cp->signature_ref_index_at(name_and_type_ref_index);
751 const Symbol* const signature = cp->symbol_at(signature_ref_index);
752 if (signature->is_void_method_signature()
753 && ref_kind == JVM_REF_newInvokeSpecial) {
754 // OK, could be a constructor call
755 } else {
756 classfile_parse_error(
757 "Bad method name at constant pool index %u in class file %s",
758 name_ref_index, THREAD);
759 return;
760 }
761 }
762 break;
763 }
764 // Other ref_kinds are already fully checked in previous pass.
765 } // switch(ref_kind)
766 break;
767 }
768 case JVM_CONSTANT_MethodType: {
769 const Symbol* const no_name = vmSymbols::type_name(); // place holder
770 const Symbol* const signature = cp->method_type_signature_at(index);
771 verify_legal_method_signature(no_name, signature, CHECK);
772 break;
773 }
774 case JVM_CONSTANT_Utf8: {
775 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
787
788 NameSigHash(Symbol* name, Symbol* sig) :
789 _name(name),
790 _sig(sig) {}
791
792 static unsigned int hash(NameSigHash const& namesig) {
793 return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
794 }
795
796 static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
797 return (e0._name == e1._name) &&
798 (e0._sig == e1._sig);
799 }
800 };
801
802 using NameSigHashtable = HashTable<NameSigHash, int,
803 NameSigHash::HASH_ROW_SIZE,
804 AnyObj::RESOURCE_AREA, mtInternal,
805 &NameSigHash::hash, &NameSigHash::equals>;
806
807 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
808 assert(super_type != nullptr,"Method doesn't support null super type");
809 if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
810 && super_type->name() != vmSymbols::java_lang_Object()) {
811 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
812 err_msg("Value type %s has an identity type as supertype",
813 current->class_name()->as_klass_external_name()));
814 }
815 }
816
817 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
818 int itfs_len,
819 ConstantPool* cp,
820 bool* const has_nonstatic_concrete_methods,
821 // FIXME: lots of these functions
822 // declare their parameters as const,
823 // which adds only noise to the code.
824 // Remove the spurious const modifiers.
825 // Many are of the form "const int x"
826 // or "T* const x".
827 TRAPS) {
828 assert(stream != nullptr, "invariant");
829 assert(cp != nullptr, "invariant");
830 assert(has_nonstatic_concrete_methods != nullptr, "invariant");
831
832 if (itfs_len == 0) {
833 _local_interfaces = Universe::the_empty_instance_klass_array();
834
835 } else {
836 assert(itfs_len > 0, "only called for len>0");
837 _local_interface_indexes = new GrowableArray<u2>(itfs_len);
838 int index = 0;
839 for (index = 0; index < itfs_len; index++) {
840 const u2 interface_index = stream->get_u2(CHECK);
841 guarantee_property(
842 valid_klass_reference_at(interface_index),
843 "Interface name has bad constant pool index %u in class file %s",
844 interface_index, CHECK);
845 _local_interface_indexes->at_put_grow(index, interface_index);
846 }
847
848 if (!_need_verify || itfs_len <= 1) {
849 return;
850 }
851
852 // Check if there's any duplicates in interfaces
853 ResourceMark rm(THREAD);
854 // Set containing interface names
855 HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
856 for (index = 0; index < itfs_len; index++) {
857 Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
858 // If no duplicates, add (name, nullptr) in hashtable interface_names.
859 if (!interface_names->put(interface_name, 0)) {
860 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
861 interface_name->as_C_string(), THREAD);
862 return;
863 }
864 }
865 }
866 }
867
868 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
869 int constantvalue_index,
870 int signature_index,
871 TRAPS) const {
872 // Make sure the constant pool entry is of a type appropriate to this field
873 guarantee_property(
874 (constantvalue_index > 0 &&
875 constantvalue_index < cp->length()),
876 "Bad initial value index %u in ConstantValue attribute in class file %s",
877 constantvalue_index, CHECK);
924 class AnnotationCollector : public ResourceObj{
925 public:
926 enum Location { _in_field, _in_method, _in_class };
927 enum ID {
928 _unknown = 0,
929 _method_CallerSensitive,
930 _method_ForceInline,
931 _method_DontInline,
932 _method_ChangesCurrentThread,
933 _method_JvmtiHideEvents,
934 _method_JvmtiMountTransition,
935 _method_InjectedProfile,
936 _method_LambdaForm_Compiled,
937 _method_Hidden,
938 _method_Scoped,
939 _method_IntrinsicCandidate,
940 _jdk_internal_vm_annotation_Contended,
941 _field_Stable,
942 _jdk_internal_vm_annotation_ReservedStackAccess,
943 _jdk_internal_ValueBased,
944 _jdk_internal_LooselyConsistentValue,
945 _jdk_internal_NullRestricted,
946 _java_lang_Deprecated,
947 _java_lang_Deprecated_for_removal,
948 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
949 _method_AOTRuntimeSetup,
950 _annotation_LIMIT
951 };
952 const Location _location;
953 int _annotations_present;
954 u2 _contended_group;
955
956 AnnotationCollector(Location location)
957 : _location(location), _annotations_present(0), _contended_group(0)
958 {
959 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
960 }
961 // If this annotation name has an ID, report it (or _none).
962 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
963 // Set the annotation name:
964 void set_annotation(ID id) {
965 assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
1352 }
1353
1354 *constantvalue_index_addr = constantvalue_index;
1355 *is_synthetic_addr = is_synthetic;
1356 *generic_signature_index_addr = generic_signature_index;
1357 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1358 runtime_visible_annotations_length,
1359 CHECK);
1360 parsed_annotations->set_field_annotations(a);
1361 a = allocate_annotations(runtime_visible_type_annotations,
1362 runtime_visible_type_annotations_length,
1363 CHECK);
1364 parsed_annotations->set_field_type_annotations(a);
1365 return;
1366 }
1367
1368
1369 // Side-effects: populates the _fields, _fields_annotations,
1370 // _fields_type_annotations fields
1371 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1372 AccessFlags class_access_flags,
1373 ConstantPool* cp,
1374 const int cp_size,
1375 u2* const java_fields_count_ptr,
1376 TRAPS) {
1377
1378 assert(cfs != nullptr, "invariant");
1379 assert(cp != nullptr, "invariant");
1380 assert(java_fields_count_ptr != nullptr, "invariant");
1381
1382 assert(nullptr == _fields_annotations, "invariant");
1383 assert(nullptr == _fields_type_annotations, "invariant");
1384
1385 // "inline type" means concrete value class
1386 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1387 // "value class" can be either abstract or concrete value class
1388 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1389 cfs->guarantee_more(2, CHECK); // length
1390 const u2 length = cfs->get_u2_fast();
1391 *java_fields_count_ptr = length;
1392
1393 int num_injected = 0;
1394 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1395 &num_injected);
1396
1397 // Two more slots are required for inline classes:
1398 // - The static field ".null_reset" which carries the nullable flat layout
1399 // representation of null, added below
1400 // - The nonstatic field ".empty" the JVM injects when detecting an empty
1401 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout
1402 // One more slot is required for both abstract value class and inline classes:
1403 // - The static field ".acmp_maps" for acmp and identity hash, tracks
1404 // nonstatic fields both inherited or declared, added below
1405 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1406 + (is_value_class ? 1 : 0);
1407
1408 // Allocate a temporary resource array to collect field data.
1409 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1410 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1411
1412 ResourceMark rm(THREAD);
1413 for (int n = 0; n < length; n++) {
1414 // access_flags, name_index, descriptor_index, attributes_count
1415 cfs->guarantee_more(8, CHECK);
1416
1417 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1418 if (!supports_inline_types()) {
1419 recognized_modifiers &= ~JVM_ACC_STRICT_INIT;
1420 }
1421
1422 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1423 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1424 AccessFlags access_flags;
1425 access_flags.set_flags(flags);
1426 FieldInfo::FieldFlags fieldFlags(0);
1427
1428 const u2 name_index = cfs->get_u2_fast();
1429 guarantee_property(valid_symbol_at(name_index),
1430 "Invalid constant pool index %u for field name in class file %s",
1431 name_index, CHECK);
1432 const Symbol* const name = cp->symbol_at(name_index);
1433 verify_legal_field_name(name, CHECK);
1434
1435 const u2 signature_index = cfs->get_u2_fast();
1436 guarantee_property(valid_symbol_at(signature_index),
1437 "Invalid constant pool index %u for field signature in class file %s",
1438 signature_index, CHECK);
1439 const Symbol* const sig = cp->symbol_at(signature_index);
1440 verify_legal_field_signature(name, sig, CHECK);
1441
1442 u2 constantvalue_index = 0;
1443 bool is_synthetic = false;
1444 u2 generic_signature_index = 0;
1445 const bool is_static = access_flags.is_static();
1446 FieldAnnotationCollector parsed_annotations(_loader_data);
1447
1448 bool is_null_restricted = false;
1449
1450 const u2 attributes_count = cfs->get_u2_fast();
1451 if (attributes_count > 0) {
1452 parse_field_attributes(cfs,
1453 attributes_count,
1454 is_static,
1455 signature_index,
1456 &constantvalue_index,
1457 &is_synthetic,
1458 &generic_signature_index,
1459 &parsed_annotations,
1460 CHECK);
1461
1462 if (parsed_annotations.field_annotations() != nullptr) {
1463 if (_fields_annotations == nullptr) {
1464 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1465 _loader_data, length, nullptr,
1466 CHECK);
1467 }
1468 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1469 parsed_annotations.set_field_annotations(nullptr);
1470 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1471 if (!Signature::has_envelope(sig)) {
1472 Exceptions::fthrow(
1473 THREAD_AND_LOCATION,
1474 vmSymbols::java_lang_ClassFormatError(),
1475 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1476 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1477 return;
1478 }
1479 if (!supports_inline_types()) {
1480 Exceptions::fthrow(
1481 THREAD_AND_LOCATION,
1482 vmSymbols::java_lang_ClassFormatError(),
1483 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file",
1484 class_name()->as_C_string(), name->as_C_string());
1485 return;
1486 }
1487
1488 if ((flags & JVM_ACC_STRICT_INIT) == 0) {
1489 // Inject STRICT_INIT and validate in context
1490 const jint patched_flags = flags | JVM_ACC_STRICT_INIT;
1491 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK);
1492 access_flags.set_flags(patched_flags);
1493 }
1494 is_null_restricted = true;
1495 }
1496 parsed_annotations.set_field_annotations(nullptr);
1497 }
1498 if (parsed_annotations.field_type_annotations() != nullptr) {
1499 if (_fields_type_annotations == nullptr) {
1500 _fields_type_annotations =
1501 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1502 length,
1503 nullptr,
1504 CHECK);
1505 }
1506 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1507 parsed_annotations.set_field_type_annotations(nullptr);
1508 }
1509
1510 if (is_synthetic) {
1511 access_flags.set_is_synthetic();
1512 }
1513 if (generic_signature_index != 0) {
1514 fieldFlags.update_generic(true);
1515 }
1516 }
1517
1518 if (is_null_restricted) {
1519 fieldFlags.update_null_free_inline_type(true);
1520 }
1521
1522 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1523
1524 // Update number of static oop fields.
1525 if (is_static && is_reference_type(type)) {
1526 _static_oop_count++;
1527 }
1528
1529 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1530 fi.set_index(n);
1531 if (fieldFlags.is_generic()) {
1532 fi.set_generic_signature_index(generic_signature_index);
1533 }
1534 parsed_annotations.apply_to(&fi);
1535 if (fi.field_flags().is_contended()) {
1536 _has_contended_fields = true;
1537 }
1538 if (access_flags.is_strict() && access_flags.is_static()) {
1539 _has_strict_static_fields = true;
1540 }
1541 _temp_field_info->append(fi);
1542 }
1543 assert(_temp_field_info->length() == length, "Must be");
1544
1545 if (num_injected != 0) {
1546 for (int n = 0; n < num_injected; n++) {
1547 // Check for duplicates
1548 if (injected[n].may_be_java) {
1549 const Symbol* const name = injected[n].name();
1550 const Symbol* const signature = injected[n].signature();
1551 bool duplicate = false;
1552 for (int i = 0; i < length; i++) {
1553 const FieldInfo* const f = _temp_field_info->adr_at(i);
1554 if (name == cp->symbol_at(f->name_index()) &&
1555 signature == cp->symbol_at(f->signature_index())) {
1556 // Symbol is desclared in Java so skip this one
1557 duplicate = true;
1558 break;
1559 }
1560 }
1561 if (duplicate) {
1562 // These will be removed from the field array at the end
1563 continue;
1564 }
1565 }
1566
1567 // Injected field
1568 FieldInfo::FieldFlags fflags(0);
1569 fflags.update_injected(true);
1570 AccessFlags aflags;
1571 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1572 int idx = _temp_field_info->append(fi);
1573 _temp_field_info->adr_at(idx)->set_index(idx);
1574 }
1575 }
1576
1577 if (is_inline_type) {
1578 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1579 // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1580 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1581 // alive.
1582 FieldInfo::FieldFlags fflags2(0);
1583 fflags2.update_injected(true);
1584 AccessFlags aflags2(JVM_ACC_STATIC);
1585 FieldInfo fi2(aflags2,
1586 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1587 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1588 0,
1589 fflags2);
1590 int idx2 = _temp_field_info->append(fi2);
1591 _temp_field_info->adr_at(idx2)->set_index(idx2);
1592 _static_oop_count++;
1593 }
1594 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1595 && _class_name != vmSymbols::java_lang_Object()) {
1596 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1597 FieldInfo::FieldFlags fflags2(0);
1598 fflags2.update_injected(true);
1599 fflags2.update_stable(true);
1600 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1601 FieldInfo fi3(aflags2,
1602 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1603 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1604 0,
1605 fflags2);
1606 int idx2 = _temp_field_info->append(fi3);
1607 _temp_field_info->adr_at(idx2)->set_index(idx2);
1608 _static_oop_count++;
1609 }
1610
1611 if (_need_verify && length > 1) {
1612 // Check duplicated fields
1613 ResourceMark rm(THREAD);
1614 // Set containing name-signature pairs
1615 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1616 for (int i = 0; i < _temp_field_info->length(); i++) {
1617 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1618 _temp_field_info->adr_at(i)->signature(_cp));
1619 // If no duplicates, add name/signature in hashtable names_and_sigs.
1620 if(!names_and_sigs->put(name_and_sig, 0)) {
1621 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1622 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1623 return;
1624 }
1625 }
1626 }
1627 }
1628
1629
1969 }
1970 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1971 if (_location != _in_field && _location != _in_class) {
1972 break; // only allow for fields and classes
1973 }
1974 if (!EnableContended || (RestrictContended && !privileged)) {
1975 break; // honor privileges
1976 }
1977 return _jdk_internal_vm_annotation_Contended;
1978 }
1979 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1980 if (_location != _in_method) break; // only allow for methods
1981 if (RestrictReservedStack && !privileged) break; // honor privileges
1982 return _jdk_internal_vm_annotation_ReservedStackAccess;
1983 }
1984 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1985 if (_location != _in_class) break; // only allow for classes
1986 if (!privileged) break; // only allow in privileged code
1987 return _jdk_internal_ValueBased;
1988 }
1989 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1990 if (_location != _in_class) break; // only allow for classes
1991 return _jdk_internal_LooselyConsistentValue;
1992 }
1993 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1994 if (_location != _in_field) break; // only allow for fields
1995 return _jdk_internal_NullRestricted;
1996 }
1997 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1998 return _java_lang_Deprecated;
1999 }
2000 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2001 if (_location != _in_class) break; // only allow for classes
2002 if (!privileged) break; // only allow in privileged code
2003 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2004 }
2005 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2006 if (_location != _in_method) break; // only allow for methods
2007 if (!privileged) break; // only allow in privileged code
2008 return _method_AOTRuntimeSetup;
2009 }
2010 default: {
2011 break;
2012 }
2013 }
2014 return AnnotationCollector::_unknown;
2015 }
2016
2213 }
2214
2215 if (runtime_visible_type_annotations_length > 0) {
2216 a = allocate_annotations(runtime_visible_type_annotations,
2217 runtime_visible_type_annotations_length,
2218 CHECK);
2219 cm->set_type_annotations(a);
2220 }
2221 }
2222
2223
2224 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2225 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2226 // Method* to save footprint, so we only know the size of the resulting Method* when the
2227 // entire method attribute is parsed.
2228 //
2229 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2230
2231 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2232 bool is_interface,
2233 bool is_value_class,
2234 bool is_abstract_class,
2235 const ConstantPool* cp,
2236 bool* const has_localvariable_table,
2237 TRAPS) {
2238 assert(cfs != nullptr, "invariant");
2239 assert(cp != nullptr, "invariant");
2240 assert(has_localvariable_table != nullptr, "invariant");
2241
2242 ResourceMark rm(THREAD);
2243 // Parse fixed parts:
2244 // access_flags, name_index, descriptor_index, attributes_count
2245 cfs->guarantee_more(8, CHECK_NULL);
2246
2247 u2 flags = cfs->get_u2_fast();
2248 const u2 name_index = cfs->get_u2_fast();
2249 const int cp_size = cp->length();
2250 guarantee_property(
2251 valid_symbol_at(name_index),
2252 "Illegal constant pool index %u for method name in class file %s",
2253 name_index, CHECK_NULL);
2254 const Symbol* const name = cp->symbol_at(name_index);
2256
2257 const u2 signature_index = cfs->get_u2_fast();
2258 guarantee_property(
2259 valid_symbol_at(signature_index),
2260 "Illegal constant pool index %u for method signature in class file %s",
2261 signature_index, CHECK_NULL);
2262 const Symbol* const signature = cp->symbol_at(signature_index);
2263
2264 if (name == vmSymbols::class_initializer_name()) {
2265 // We ignore the other access flags for a valid class initializer.
2266 // (JVM Spec 2nd ed., chapter 4.6)
2267 if (_major_version < 51) { // backward compatibility
2268 flags = JVM_ACC_STATIC;
2269 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2270 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2271 } else {
2272 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2273 return nullptr;
2274 }
2275 } else {
2276 verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2277 }
2278
2279 if (name == vmSymbols::object_initializer_name() && is_interface) {
2280 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2281 return nullptr;
2282 }
2283
2284 if (Arguments::is_valhalla_enabled()) {
2285 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2286 && ((flags & JVM_ACC_STATIC) == 0 )
2287 && !_access_flags.is_identity_class()) {
2288 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2289 return nullptr;
2290 }
2291 }
2292
2293 int args_size = -1; // only used when _need_verify is true
2294 if (_need_verify) {
2295 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2296 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2297 verify_legal_method_signature(name, signature, CHECK_NULL);
2298 if (args_size > MAX_ARGS_SIZE) {
2299 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2300 return nullptr;
2301 }
2302 }
2303
2304 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2305
2306 // Default values for code and exceptions attribute elements
2307 u2 max_stack = 0;
2308 u2 max_locals = 0;
2309 u4 code_length = 0;
2310 const u1* code_start = nullptr;
2311 u2 exception_table_length = 0;
2312 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2807 CHECK_NULL);
2808
2809 if (InstanceKlass::is_finalization_enabled() &&
2810 name == vmSymbols::finalize_method_name() &&
2811 signature == vmSymbols::void_method_signature()) {
2812 if (m->is_empty_method()) {
2813 _has_empty_finalizer = true;
2814 } else {
2815 _has_finalizer = true;
2816 }
2817 }
2818
2819 NOT_PRODUCT(m->verify());
2820 return m;
2821 }
2822
2823
2824 // Side-effects: populates the _methods field in the parser
2825 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2826 bool is_interface,
2827 bool is_value_class,
2828 bool is_abstract_type,
2829 bool* const has_localvariable_table,
2830 bool* has_final_method,
2831 bool* declares_nonstatic_concrete_methods,
2832 TRAPS) {
2833 assert(cfs != nullptr, "invariant");
2834 assert(has_localvariable_table != nullptr, "invariant");
2835 assert(has_final_method != nullptr, "invariant");
2836 assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2837
2838 assert(nullptr == _methods, "invariant");
2839
2840 cfs->guarantee_more(2, CHECK); // length
2841 const u2 length = cfs->get_u2_fast();
2842 if (length == 0) {
2843 _methods = Universe::the_empty_method_array();
2844 } else {
2845 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2846 length,
2847 nullptr,
2848 CHECK);
2849
2850 for (int index = 0; index < length; index++) {
2851 Method* method = parse_method(cfs,
2852 is_interface,
2853 is_value_class,
2854 is_abstract_type,
2855 _cp,
2856 has_localvariable_table,
2857 CHECK);
2858
2859 if (method->is_final()) {
2860 *has_final_method = true;
2861 }
2862 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2863 // used for interface initialization, and default method inheritance analysis
2864 if (is_interface && !(*declares_nonstatic_concrete_methods)
2865 && !method->is_abstract() && !method->is_static()) {
2866 *declares_nonstatic_concrete_methods = true;
2867 }
2868 _methods->at_put(index, method);
2869 }
2870
2871 if (_need_verify && length > 1) {
2872 // Check duplicated methods
2873 ResourceMark rm(THREAD);
2874 // Set containing name-signature pairs
3100 valid_klass_reference_at(outer_class_info_index),
3101 "outer_class_info_index %u has bad constant type in class file %s",
3102 outer_class_info_index, CHECK_0);
3103
3104 if (outer_class_info_index != 0) {
3105 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3106 char* bytes = (char*)outer_class_name->bytes();
3107 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3108 "Outer class is an array class in class file %s", CHECK_0);
3109 }
3110 // Inner class name
3111 const u2 inner_name_index = cfs->get_u2_fast();
3112 guarantee_property(
3113 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3114 "inner_name_index %u has bad constant type in class file %s",
3115 inner_name_index, CHECK_0);
3116 if (_need_verify) {
3117 guarantee_property(inner_class_info_index != outer_class_info_index,
3118 "Class is both outer and inner class in class file %s", CHECK_0);
3119 }
3120
3121 // Access flags
3122 u2 flags;
3123 // JVM_ACC_MODULE is defined in JDK-9 and later.
3124 if (_major_version >= JAVA_9_VERSION) {
3125 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3126 } else {
3127 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3128 }
3129
3130 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3131 // Set abstract bit for old class files for backward compatibility
3132 flags |= JVM_ACC_ABSTRACT;
3133 }
3134
3135 if (!supports_inline_types()) {
3136 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3137 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3138 if (!is_module && !is_interface) {
3139 flags |= JVM_ACC_IDENTITY;
3140 }
3141 }
3142
3143 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3144 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3145 AccessFlags inner_access_flags(flags);
3146
3147 inner_classes->at_put(index++, inner_class_info_index);
3148 inner_classes->at_put(index++, outer_class_info_index);
3149 inner_classes->at_put(index++, inner_name_index);
3150 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3151 }
3152
3153 // Check for circular and duplicate entries.
3154 bool has_circularity = false;
3155 if (_need_verify) {
3156 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3157 if (has_circularity) {
3158 // If circularity check failed then ignore InnerClasses attribute.
3159 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3160 index = 0;
3161 if (parsed_enclosingmethod_attribute) {
3162 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3228 if (length > 0) {
3229 int index = 0;
3230 cfs->guarantee_more(2 * length, CHECK_0);
3231 for (int n = 0; n < length; n++) {
3232 const u2 class_info_index = cfs->get_u2_fast();
3233 guarantee_property(
3234 valid_klass_reference_at(class_info_index),
3235 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3236 class_info_index, CHECK_0);
3237 permitted_subclasses->at_put(index++, class_info_index);
3238 }
3239 assert(index == size, "wrong size");
3240 }
3241
3242 // Restore buffer's current position.
3243 cfs->set_current(current_mark);
3244
3245 return length;
3246 }
3247
3248 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3249 const u1* const loadable_descriptors_attribute_start,
3250 TRAPS) {
3251 const u1* const current_mark = cfs->current();
3252 u2 length = 0;
3253 if (loadable_descriptors_attribute_start != nullptr) {
3254 cfs->set_current(loadable_descriptors_attribute_start);
3255 cfs->guarantee_more(2, CHECK_0); // length
3256 length = cfs->get_u2_fast();
3257 }
3258 const int size = length;
3259 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3260 _loadable_descriptors = loadable_descriptors;
3261 if (length > 0) {
3262 int index = 0;
3263 cfs->guarantee_more(2 * length, CHECK_0);
3264 for (int n = 0; n < length; n++) {
3265 const u2 descriptor_index = cfs->get_u2_fast();
3266 guarantee_property(
3267 valid_symbol_at(descriptor_index),
3268 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3269 descriptor_index, CHECK_0);
3270 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3271 bool valid = legal_field_signature(descriptor, CHECK_0);
3272 if(!valid) {
3273 ResourceMark rm(THREAD);
3274 Exceptions::fthrow(THREAD_AND_LOCATION,
3275 vmSymbols::java_lang_ClassFormatError(),
3276 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3277 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3278 return 0;
3279 }
3280 loadable_descriptors->at_put(index++, descriptor_index);
3281 }
3282 assert(index == size, "wrong size");
3283 }
3284
3285 // Restore buffer's current position.
3286 cfs->set_current(current_mark);
3287
3288 return length;
3289 }
3290
3291 // Record {
3292 // u2 attribute_name_index;
3293 // u4 attribute_length;
3294 // u2 components_count;
3295 // component_info components[components_count];
3296 // }
3297 // component_info {
3298 // u2 name_index;
3299 // u2 descriptor_index
3300 // u2 attributes_count;
3301 // attribute_info_attributes[attributes_count];
3302 // }
3303 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3304 const ConstantPool* cp,
3305 const u1* const record_attribute_start,
3306 TRAPS) {
3307 const u1* const current_mark = cfs->current();
3308 int components_count = 0;
3309 unsigned int calculate_attr_size = 0;
3310 if (record_attribute_start != nullptr) {
3521 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3522 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3523 "Bad length on BootstrapMethods in class file %s",
3524 CHECK);
3525 }
3526
3527 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3528 ConstantPool* cp,
3529 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3530 TRAPS) {
3531 assert(cfs != nullptr, "invariant");
3532 assert(cp != nullptr, "invariant");
3533 assert(parsed_annotations != nullptr, "invariant");
3534
3535 // Set inner classes attribute to default sentinel
3536 _inner_classes = Universe::the_empty_short_array();
3537 // Set nest members attribute to default sentinel
3538 _nest_members = Universe::the_empty_short_array();
3539 // Set _permitted_subclasses attribute to default sentinel
3540 _permitted_subclasses = Universe::the_empty_short_array();
3541 // Set _loadable_descriptors attribute to default sentinel
3542 _loadable_descriptors = Universe::the_empty_short_array();
3543 cfs->guarantee_more(2, CHECK); // attributes_count
3544 u2 attributes_count = cfs->get_u2_fast();
3545 bool parsed_sourcefile_attribute = false;
3546 bool parsed_innerclasses_attribute = false;
3547 bool parsed_nest_members_attribute = false;
3548 bool parsed_permitted_subclasses_attribute = false;
3549 bool parsed_loadable_descriptors_attribute = false;
3550 bool parsed_nest_host_attribute = false;
3551 bool parsed_record_attribute = false;
3552 bool parsed_enclosingmethod_attribute = false;
3553 bool parsed_bootstrap_methods_attribute = false;
3554 const u1* runtime_visible_annotations = nullptr;
3555 int runtime_visible_annotations_length = 0;
3556 const u1* runtime_visible_type_annotations = nullptr;
3557 int runtime_visible_type_annotations_length = 0;
3558 bool runtime_invisible_type_annotations_exists = false;
3559 bool runtime_invisible_annotations_exists = false;
3560 bool parsed_source_debug_ext_annotations_exist = false;
3561 const u1* inner_classes_attribute_start = nullptr;
3562 u4 inner_classes_attribute_length = 0;
3563 u2 enclosing_method_class_index = 0;
3564 u2 enclosing_method_method_index = 0;
3565 const u1* nest_members_attribute_start = nullptr;
3566 u4 nest_members_attribute_length = 0;
3567 const u1* record_attribute_start = nullptr;
3568 u4 record_attribute_length = 0;
3569 const u1* permitted_subclasses_attribute_start = nullptr;
3570 u4 permitted_subclasses_attribute_length = 0;
3571 const u1* loadable_descriptors_attribute_start = nullptr;
3572 u4 loadable_descriptors_attribute_length = 0;
3573
3574 // Iterate over attributes
3575 while (attributes_count--) {
3576 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3577 const u2 attribute_name_index = cfs->get_u2_fast();
3578 const u4 attribute_length = cfs->get_u4_fast();
3579 guarantee_property(
3580 valid_symbol_at(attribute_name_index),
3581 "Attribute name has bad constant pool index %u in class file %s",
3582 attribute_name_index, CHECK);
3583 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3584 if (tag == vmSymbols::tag_source_file()) {
3585 // Check for SourceFile tag
3586 if (_need_verify) {
3587 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3588 }
3589 if (parsed_sourcefile_attribute) {
3590 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3591 return;
3592 } else {
3768 return;
3769 }
3770 parsed_record_attribute = true;
3771 record_attribute_start = cfs->current();
3772 record_attribute_length = attribute_length;
3773 } else if (_major_version >= JAVA_17_VERSION) {
3774 if (tag == vmSymbols::tag_permitted_subclasses()) {
3775 if (parsed_permitted_subclasses_attribute) {
3776 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3777 return;
3778 }
3779 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3780 if (_access_flags.is_final()) {
3781 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3782 return;
3783 }
3784 parsed_permitted_subclasses_attribute = true;
3785 permitted_subclasses_attribute_start = cfs->current();
3786 permitted_subclasses_attribute_length = attribute_length;
3787 }
3788 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3789 if (parsed_loadable_descriptors_attribute) {
3790 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3791 return;
3792 }
3793 parsed_loadable_descriptors_attribute = true;
3794 loadable_descriptors_attribute_start = cfs->current();
3795 loadable_descriptors_attribute_length = attribute_length;
3796 }
3797 }
3798 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3799 cfs->skip_u1(attribute_length, CHECK);
3800 } else {
3801 // Unknown attribute
3802 cfs->skip_u1(attribute_length, CHECK);
3803 }
3804 } else {
3805 // Unknown attribute
3806 cfs->skip_u1(attribute_length, CHECK);
3807 }
3808 } else {
3809 // Unknown attribute
3810 cfs->skip_u1(attribute_length, CHECK);
3811 }
3812 }
3813 _class_annotations = allocate_annotations(runtime_visible_annotations,
3814 runtime_visible_annotations_length,
3815 CHECK);
3816 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3853 CHECK);
3854 if (_need_verify) {
3855 guarantee_property(record_attribute_length == calculated_attr_length,
3856 "Record attribute has wrong length in class file %s",
3857 CHECK);
3858 }
3859 }
3860
3861 if (parsed_permitted_subclasses_attribute) {
3862 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3863 cfs,
3864 permitted_subclasses_attribute_start,
3865 CHECK);
3866 if (_need_verify) {
3867 guarantee_property(
3868 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3869 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3870 }
3871 }
3872
3873 if (parsed_loadable_descriptors_attribute) {
3874 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3875 cfs,
3876 loadable_descriptors_attribute_start,
3877 CHECK);
3878 if (_need_verify) {
3879 guarantee_property(
3880 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3881 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3882 }
3883 }
3884
3885 if (_max_bootstrap_specifier_index >= 0) {
3886 guarantee_property(parsed_bootstrap_methods_attribute,
3887 "Missing BootstrapMethods attribute in class file %s", CHECK);
3888 }
3889 }
3890
3891 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3892 assert(k != nullptr, "invariant");
3893
3894 if (_synthetic_flag)
3895 k->set_is_synthetic();
3896 if (_sourcefile_index != 0) {
3897 k->set_source_file_name_index(_sourcefile_index);
3898 }
3899 if (_generic_signature_index != 0) {
3900 k->set_generic_signature_index(_generic_signature_index);
3901 }
3902 if (_sde_buffer != nullptr) {
3903 k->set_source_debug_extension(_sde_buffer, _sde_length);
3904 }
3931 _class_type_annotations = nullptr;
3932 _fields_annotations = nullptr;
3933 _fields_type_annotations = nullptr;
3934 }
3935
3936 // Transfer ownership of metadata allocated to the InstanceKlass.
3937 void ClassFileParser::apply_parsed_class_metadata(
3938 InstanceKlass* this_klass,
3939 int java_fields_count) {
3940 assert(this_klass != nullptr, "invariant");
3941
3942 _cp->set_pool_holder(this_klass);
3943 this_klass->set_constants(_cp);
3944 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3945 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3946 this_klass->set_fields_status(_fields_status);
3947 this_klass->set_methods(_methods);
3948 this_klass->set_inner_classes(_inner_classes);
3949 this_klass->set_nest_members(_nest_members);
3950 this_klass->set_nest_host_index(_nest_host);
3951 this_klass->set_loadable_descriptors(_loadable_descriptors);
3952 this_klass->set_annotations(_combined_annotations);
3953 this_klass->set_permitted_subclasses(_permitted_subclasses);
3954 this_klass->set_record_components(_record_components);
3955 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3956
3957 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3958
3959 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3960 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3961 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3962 // its _super. If an OOM occurs while loading the current klass, its _super field
3963 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3964 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3965 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3966
3967 // Clear out these fields so they don't get deallocated by the destructor
3968 clear_class_metadata();
3969 }
3970
3971 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3972 int anno_length,
3973 TRAPS) {
3974 AnnotationArray* annotations = nullptr;
3975 if (anno != nullptr) {
3976 annotations = MetadataFactory::new_array<u1>(_loader_data,
3977 anno_length,
3978 CHECK_(annotations));
3979 for (int i = 0; i < anno_length; i++) {
3980 annotations->at_put(i, anno[i]);
3981 }
3982 }
3983 return annotations;
3984 }
3985
3986 void ClassFileParser::check_super_class(ConstantPool* const cp,
3987 const int super_class_index,
3988 const bool need_verify,
3989 TRAPS) {
3990 assert(cp != nullptr, "invariant");
3991
3992 if (super_class_index == 0) {
3993 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3994 "Invalid superclass index 0 in class file %s",
3995 CHECK);
3996 } else {
3997 guarantee_property(valid_klass_reference_at(super_class_index),
3998 "Invalid superclass index %u in class file %s",
3999 super_class_index,
4000 CHECK);
4001
4002 // The class name should be legal because it is checked when parsing constant pool.
4003 // However, make sure it is not an array type.
4004 if (need_verify) {
4005 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4006 "Bad superclass name in class file %s", CHECK);
4007 }
4008 }
4009 }
4010
4011 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4012 _max_nonstatic_oop_maps = max_blocks;
4013 _nonstatic_oop_map_count = 0;
4014 if (max_blocks == 0) {
4166 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4167 assert(ik->size_helper() > 0, "layout_helper is initialized");
4168 if (ik->is_abstract() || ik->is_interface()
4169 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4170 || ik->size_helper() >= FastAllocateSizeLimit) {
4171 // Forbid fast-path allocation.
4172 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4173 ik->set_layout_helper(lh);
4174 }
4175
4176 // Propagate the AOT runtimeSetup method discovery
4177 if (_has_aot_runtime_setup_method) {
4178 ik->set_is_runtime_setup_required();
4179 if (log_is_enabled(Info, aot, init)) {
4180 ResourceMark rm;
4181 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4182 }
4183 }
4184 }
4185
4186 bool ClassFileParser::supports_inline_types() const {
4187 // Inline types are only supported by class file version 71.65535 and later
4188 return _major_version > JAVA_27_VERSION ||
4189 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4190 }
4191
4192 // utility methods for appending an array with check for duplicates
4193
4194 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4195 const Array<InstanceKlass*>* const ifs) {
4196 // iterate over new interfaces
4197 for (int i = 0; i < ifs->length(); i++) {
4198 InstanceKlass* const e = ifs->at(i);
4199 assert(e->is_klass() && e->is_interface(), "just checking");
4200 // add new interface
4201 result->append_if_missing(e);
4202 }
4203 }
4204
4205 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4206 Array<InstanceKlass*>* local_ifs,
4207 ClassLoaderData* loader_data,
4208 TRAPS) {
4209 assert(local_ifs != nullptr, "invariant");
4210 assert(loader_data != nullptr, "invariant");
4211
4215 // Add superclass transitive interfaces size
4216 if (super != nullptr) {
4217 super_size = super->transitive_interfaces()->length();
4218 max_transitive_size += super_size;
4219 }
4220 // Add local interfaces' super interfaces
4221 const int local_size = local_ifs->length();
4222 for (int i = 0; i < local_size; i++) {
4223 InstanceKlass* const l = local_ifs->at(i);
4224 max_transitive_size += l->transitive_interfaces()->length();
4225 }
4226 // Finally add local interfaces
4227 max_transitive_size += local_size;
4228 // Construct array
4229 if (max_transitive_size == 0) {
4230 // no interfaces, use canonicalized array
4231 return Universe::the_empty_instance_klass_array();
4232 } else if (max_transitive_size == super_size) {
4233 // no new local interfaces added, share superklass' transitive interface array
4234 return super->transitive_interfaces();
4235 // The three lines below are commented to work around bug JDK-8245487
4236 // } else if (max_transitive_size == local_size) {
4237 // // only local interfaces added, share local interface array
4238 // return local_ifs;
4239 } else {
4240 ResourceMark rm;
4241 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4242
4243 // Copy down from superclass
4244 if (super != nullptr) {
4245 append_interfaces(result, super->transitive_interfaces());
4246 }
4247
4248 // Copy down from local interfaces' superinterfaces
4249 for (int i = 0; i < local_size; i++) {
4250 InstanceKlass* const l = local_ifs->at(i);
4251 append_interfaces(result, l->transitive_interfaces());
4252 }
4253 // Finally add local interfaces
4254 append_interfaces(result, local_ifs);
4255
4256 // length will be less than the max_transitive_size if duplicates were removed
4257 const int length = result->length();
4258 assert(length <= max_transitive_size, "just checking");
4259
4260 Array<InstanceKlass*>* const new_result =
4261 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4262 for (int i = 0; i < length; i++) {
4263 InstanceKlass* const e = result->at(i);
4264 assert(e != nullptr, "just checking");
4265 new_result->at_put(i, e);
4266 }
4267 return new_result;
4268 }
4269 }
4270
4271 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4272 assert(this_klass != nullptr, "invariant");
4273 const InstanceKlass* const super = this_klass->super();
4274
4275 if (super != nullptr) {
4276 if (super->is_final()) {
4277 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4278 return;
4279 }
4280
4281 if (super->is_sealed()) {
4282 stringStream ss;
4283 ResourceMark rm(THREAD);
4284 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4285 classfile_icce_error(ss.as_string(), THREAD);
4286 return;
4287 }
4288 }
4289
4290 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4291 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4292 // for a value classes. So, it is treated as a special case for now.
4293 if (!this_klass->access_flags().is_identity_class() &&
4294 super->name() != vmSymbols::java_lang_Object() &&
4295 super->is_identity_class()) {
4296 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4297 return;
4298 }
4299
4300 Reflection::VerifyClassAccessResults vca_result =
4301 Reflection::verify_class_access(this_klass, super, false);
4302 if (vca_result != Reflection::ACCESS_OK) {
4303 ResourceMark rm(THREAD);
4304 char* msg = Reflection::verify_class_access_msg(this_klass,
4305 super,
4306 vca_result);
4307
4308 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4309 if (msg == nullptr) {
4310 bool same_module = (this_klass->module() == super->module());
4311 Exceptions::fthrow(
4312 THREAD_AND_LOCATION,
4313 vmSymbols::java_lang_IllegalAccessError(),
4314 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4315 this_klass->external_name(),
4316 super->is_abstract() ? "abstract " : "",
4317 super->external_name(),
4318 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4319 (same_module) ? "" : "; ",
4472 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4473 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4474 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4475 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4476 if (is_module) {
4477 ResourceMark rm(THREAD);
4478 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4479 Exceptions::fthrow(
4480 THREAD_AND_LOCATION,
4481 vmSymbols::java_lang_NoClassDefFoundError(),
4482 "%s is not a class because access_flag ACC_MODULE is set",
4483 _class_name->as_C_string());
4484 return;
4485 }
4486
4487 if (!_need_verify) { return; }
4488
4489 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4490 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4491 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4492 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4493 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4494 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4495 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4496 const bool valid_value_class = is_identity || is_interface ||
4497 (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4498
4499 if ((is_abstract && is_final) ||
4500 (is_interface && !is_abstract) ||
4501 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4502 (!is_interface && major_gte_1_5 && is_annotation) ||
4503 (!valid_value_class)) {
4504 ResourceMark rm(THREAD);
4505 const char* class_note = "";
4506 if (!valid_value_class) {
4507 class_note = " (a value class must be final or else abstract)";
4508 }
4509 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4510 if (inner_name == nullptr && !is_anonymous_inner_class) {
4511 Exceptions::fthrow(
4512 THREAD_AND_LOCATION,
4513 vmSymbols::java_lang_ClassFormatError(),
4514 "Illegal class modifiers in class %s: 0x%X",
4515 _class_name->as_C_string(), flags
4516 );
4517 } else {
4518 if (is_anonymous_inner_class) {
4519 Exceptions::fthrow(
4520 THREAD_AND_LOCATION,
4521 vmSymbols::java_lang_ClassFormatError(),
4522 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4523 _class_name->as_C_string(), flags
4524 );
4525 } else {
4526 Exceptions::fthrow(
4527 THREAD_AND_LOCATION,
4528 vmSymbols::java_lang_ClassFormatError(),
4582 THREAD_AND_LOCATION,
4583 vmSymbols::java_lang_UnsupportedClassVersionError(),
4584 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4585 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4586 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4587 return;
4588 }
4589
4590 if (!Arguments::enable_preview()) {
4591 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4592 class_name, major, minor, THREAD);
4593 return;
4594 }
4595
4596 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4597 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4598 class_name, major, minor, THREAD);
4599 }
4600 }
4601
4602 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4603 AccessFlags class_access_flags,
4604 TRAPS) const {
4605 if (!_need_verify) { return; }
4606
4607 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4608 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4609 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4610 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4611 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4612 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4613 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4614 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4615 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4616 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4617
4618 const bool is_interface = class_access_flags.is_interface();
4619 const bool is_identity_class = class_access_flags.is_identity_class();
4620
4621 bool is_illegal = false;
4622 const char* error_msg = "";
4623
4624 // There is some overlap in the checks that apply, for example interface fields
4625 // must be static, static fields can't be strict, and therefore interfaces can't
4626 // have strict fields. So we don't have to check every possible invalid combination
4627 // individually as long as all are covered. Once we have found an illegal combination
4628 // we can stop checking.
4629
4630 if (!is_illegal) {
4631 if (is_interface) {
4632 if (!is_public || !is_static || !is_final || is_private ||
4633 is_protected || is_volatile || is_transient ||
4634 (major_gte_1_5 && is_enum)) {
4635 is_illegal = true;
4636 error_msg = "interface fields must be public, static and final, and may be synthetic";
4637 }
4638 } else { // not interface
4639 if (has_illegal_visibility(flags)) {
4640 is_illegal = true;
4641 error_msg = "invalid visibility flags for class field";
4642 } else if (is_final && is_volatile) {
4643 is_illegal = true;
4644 error_msg = "fields cannot be final and volatile";
4645 } else if (supports_inline_types()) {
4646 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4647 is_illegal = true;
4648 error_msg = "value class fields must be either non-static final and strict, or static";
4649 }
4650 }
4651 }
4652 }
4653
4654 if (is_illegal) {
4655 ResourceMark rm(THREAD);
4656 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4657 Exceptions::fthrow(
4658 THREAD_AND_LOCATION,
4659 vmSymbols::java_lang_ClassFormatError(),
4660 "Illegal field modifiers (%s) in class %s: 0x%X",
4661 error_msg, _class_name->as_C_string(), flags);
4662 return;
4663 }
4664 }
4665
4666 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4667 AccessFlags class_access_flags,
4668 const Symbol* name,
4669 TRAPS) const {
4670 if (!_need_verify) { return; }
4671
4672 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4673 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4674 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4675 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4676 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4677 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4678 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4679 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4680 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4681 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4682 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4683 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4684 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4685 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4686 // LW401 CR required: removal of value factories support
4687 const bool is_interface = class_access_flags.is_interface();
4688 const bool is_identity_class = class_access_flags.is_identity_class();
4689 const bool is_abstract_class = class_access_flags.is_abstract();
4690
4691 bool is_illegal = false;
4692
4693 const char* class_note = "";
4694 if (is_interface) {
4695 if (major_gte_8) {
4696 // Class file version is JAVA_8_VERSION or later Methods of
4697 // interfaces may set any of the flags except ACC_PROTECTED,
4698 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4699 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4700 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4701 (is_native || is_protected || is_final || is_synchronized) ||
4702 // If a specific method of a class or interface has its
4703 // ACC_ABSTRACT flag set, it must not have any of its
4704 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4705 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4706 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4707 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4708 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4709 is_illegal = true;
4710 }
4711 } else if (major_gte_1_5) {
4712 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4713 if (!is_public || is_private || is_protected || is_static || is_final ||
4714 is_synchronized || is_native || !is_abstract || is_strict) {
4715 is_illegal = true;
4716 }
4717 } else {
4718 // Class file version is pre-JAVA_1_5_VERSION
4719 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4720 is_illegal = true;
4721 }
4722 }
4723 } else { // not interface
4724 if (has_illegal_visibility(flags)) {
4725 is_illegal = true;
4726 } else {
4727 if (is_initializer) {
4728 if (is_static || is_final || is_synchronized || is_native ||
4729 is_abstract || (major_gte_1_5 && is_bridge)) {
4730 is_illegal = true;
4731 }
4732 } else { // not initializer
4733 if (!is_identity_class && is_synchronized && !is_static) {
4734 is_illegal = true;
4735 class_note = " (not an identity class)";
4736 } else {
4737 if (is_abstract) {
4738 if ((is_final || is_native || is_private || is_static ||
4739 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4740 is_illegal = true;
4741 }
4742 }
4743 }
4744 }
4745 }
4746 }
4747
4748 if (is_illegal) {
4749 ResourceMark rm(THREAD);
4750 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4751 Exceptions::fthrow(
4752 THREAD_AND_LOCATION,
4753 vmSymbols::java_lang_ClassFormatError(),
4754 "Method %s in class %s%s has illegal modifiers: 0x%X",
4755 name->as_C_string(), _class_name->as_C_string(),
4756 class_note, flags);
4757 return;
4758 }
4759 }
4760
4761 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4762 int length,
4763 TRAPS) const {
4764 assert(_need_verify, "only called when _need_verify is true");
4765 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4766 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4767 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4768 }
4769 }
4770
4771 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4772 // In class names, '/' separates unqualified names. This is verified in this function also.
4773 // Method names also may not contain the characters '<' or '>', unless <init>
4774 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4775 // method. Because these names have been checked as special cases before
4776 // calling this method in verify_legal_method_name.
4794 if (type == ClassFileParser::LegalClass) {
4795 if (p == name || p+1 >= name+length ||
4796 *(p+1) == JVM_SIGNATURE_SLASH) {
4797 return false;
4798 }
4799 } else {
4800 return false; // do not permit '/' unless it's class name
4801 }
4802 break;
4803 case JVM_SIGNATURE_SPECIAL:
4804 case JVM_SIGNATURE_ENDSPECIAL:
4805 // do not permit '<' or '>' in method names
4806 if (type == ClassFileParser::LegalMethod) {
4807 return false;
4808 }
4809 }
4810 }
4811 return true;
4812 }
4813
4814 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4815 if (_loadable_descriptors == nullptr) return false;
4816 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4817 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4818 if (class_name == klass) return true;
4819 }
4820 return false;
4821 }
4822
4823 // Take pointer to a UTF8 byte string (not NUL-terminated).
4824 // Skip over the longest part of the string that could
4825 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4826 // Return a pointer to just past the fieldname.
4827 // Return null if no fieldname at all was found, or in the case of slash_ok
4828 // being true, we saw consecutive slashes (meaning we were looking for a
4829 // qualified path but found something that was badly-formed).
4830 static const char* skip_over_field_name(const char* const name,
4831 bool slash_ok,
4832 unsigned int length) {
4833 const char* p;
4834 jboolean last_is_slash = false;
4835 jboolean not_first_ch = false;
4836
4837 for (p = name; p != name + length; not_first_ch = true) {
4838 const char* old_p = p;
4839 jchar ch = *p;
4840 if (ch < 128) {
4841 p++;
4842 // quick check for ascii
4904 // be taken as a field signature. Allow "void" if void_ok.
4905 // Return a pointer to just past the signature.
4906 // Return null if no legal signature is found.
4907 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4908 bool void_ok,
4909 unsigned int length,
4910 TRAPS) const {
4911 unsigned int array_dim = 0;
4912 while (length > 0) {
4913 switch (signature[0]) {
4914 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4915 case JVM_SIGNATURE_BOOLEAN:
4916 case JVM_SIGNATURE_BYTE:
4917 case JVM_SIGNATURE_CHAR:
4918 case JVM_SIGNATURE_SHORT:
4919 case JVM_SIGNATURE_INT:
4920 case JVM_SIGNATURE_FLOAT:
4921 case JVM_SIGNATURE_LONG:
4922 case JVM_SIGNATURE_DOUBLE:
4923 return signature + 1;
4924 case JVM_SIGNATURE_CLASS:
4925 {
4926 if (_major_version < JAVA_1_5_VERSION) {
4927 signature++;
4928 length--;
4929 // Skip over the class name if one is there
4930 const char* const p = skip_over_field_name(signature, true, length);
4931 assert(p == nullptr || p > signature, "must parse one character at least");
4932 // The next character better be a semicolon
4933 if (p != nullptr && // Parse of field name succeeded.
4934 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4935 p[0] == JVM_SIGNATURE_ENDCLASS) {
4936 return p + 1;
4937 }
4938 }
4939 else {
4940 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4941 signature++;
4942 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4943 // Format check signature
4944 if (c != nullptr) {
4945 int newlen = pointer_delta_as_int(c, (char*) signature);
4946 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4947 if (!legal) {
4948 classfile_parse_error("Class name is empty or contains illegal character "
4949 "in descriptor in class file %s",
4950 THREAD);
4951 return nullptr;
4952 }
4953 return signature + newlen + 1;
4954 }
4955 }
4956 return nullptr;
4957 }
4958 case JVM_SIGNATURE_ARRAY:
4959 array_dim++;
4960 if (array_dim > 255) {
4976
4977 // Checks if name is a legal class name.
4978 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4979 if (!_need_verify) { return; }
4980
4981 assert(name->refcount() > 0, "symbol must be kept alive");
4982 char* bytes = (char*)name->bytes();
4983 unsigned int length = name->utf8_length();
4984 bool legal = false;
4985
4986 if (length > 0) {
4987 const char* p;
4988 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4989 p = skip_over_field_signature(bytes, false, length, CHECK);
4990 legal = (p != nullptr) && ((p - bytes) == (int)length);
4991 } else if (_major_version < JAVA_1_5_VERSION) {
4992 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4993 p = skip_over_field_name(bytes, true, length);
4994 legal = (p != nullptr) && ((p - bytes) == (int)length);
4995 }
4996 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4997 && bytes[length - 1] == ';' ) {
4998 // Support for L...; descriptors
4999 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5000 } else {
5001 // 4900761: relax the constraints based on JSR202 spec
5002 // Class names may be drawn from the entire Unicode character set.
5003 // Identifiers between '/' must be unqualified names.
5004 // The utf8 string has been verified when parsing cpool entries.
5005 legal = verify_unqualified_name(bytes, length, LegalClass);
5006 }
5007 }
5008 if (!legal) {
5009 ResourceMark rm(THREAD);
5010 assert(_class_name != nullptr, "invariant");
5011 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5012 Exceptions::fthrow(
5013 THREAD_AND_LOCATION,
5014 vmSymbols::java_lang_ClassFormatError(),
5015 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5016 _class_name->as_C_string()
5017 );
5018 return;
5019 }
5047 THREAD_AND_LOCATION,
5048 vmSymbols::java_lang_ClassFormatError(),
5049 "Illegal field name \"%.*s\" in class %s", length, bytes,
5050 _class_name->as_C_string()
5051 );
5052 return;
5053 }
5054 }
5055
5056 // Checks if name is a legal method name.
5057 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5058 if (!_need_verify) { return; }
5059
5060 assert(name != nullptr, "method name is null");
5061 char* bytes = (char*)name->bytes();
5062 unsigned int length = name->utf8_length();
5063 bool legal = false;
5064
5065 if (length > 0) {
5066 if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5067 if (name == vmSymbols::object_initializer_name() ||
5068 name == vmSymbols::class_initializer_name()) {
5069 legal = true;
5070 }
5071 } else if (_major_version < JAVA_1_5_VERSION) {
5072 const char* p;
5073 p = skip_over_field_name(bytes, false, length);
5074 legal = (p != nullptr) && ((p - bytes) == (int)length);
5075 } else {
5076 // 4881221: relax the constraints based on JSR202 spec
5077 legal = verify_unqualified_name(bytes, length, LegalMethod);
5078 }
5079 }
5080
5081 if (!legal) {
5082 ResourceMark rm(THREAD);
5083 assert(_class_name != nullptr, "invariant");
5084 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5085 Exceptions::fthrow(
5086 THREAD_AND_LOCATION,
5087 vmSymbols::java_lang_ClassFormatError(),
5088 "Illegal method name \"%.*s\" in class %s", length, bytes,
5089 _class_name->as_C_string()
5090 );
5091 return;
5092 }
5093 }
5094
5095 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5096 const char* const bytes = (const char*)signature->bytes();
5097 const unsigned int length = signature->utf8_length();
5098 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5099
5100 if (p == nullptr || (p - bytes) != (int)length) {
5101 return false;
5102 }
5103 return true;
5104 }
5105
5106 // Checks if signature is a legal field signature.
5107 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5108 const Symbol* signature,
5109 TRAPS) const {
5110 if (!_need_verify) { return; }
5111
5112 const char* const bytes = (const char*)signature->bytes();
5113 const unsigned int length = signature->utf8_length();
5114 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5115
5116 if (p == nullptr || (p - bytes) != (int)length) {
5117 throwIllegalSignature("Field", name, signature, CHECK);
5118 }
5119 }
5120
5121 // Check that the signature is compatible with the method name. For example,
5122 // check that <init> has a void signature.
5123 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5124 const Symbol* signature,
5125 TRAPS) const {
5126 if (!_need_verify) {
5127 return;
5128 }
5129
5130 // Class initializers cannot have args for class format version >= 51.
5131 if (name == vmSymbols::class_initializer_name() &&
5132 signature != vmSymbols::void_method_signature() &&
5133 _major_version >= JAVA_7_VERSION) {
5134 throwIllegalSignature("Method", name, signature, THREAD);
5135 return;
5136 }
5137
5138 int sig_length = signature->utf8_length();
5139 if (name->utf8_length() > 0 &&
5140 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5141 sig_length > 0 &&
5142 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5143 throwIllegalSignature("Method", name, signature, THREAD);
5144 }
5145 }
5146
5147 // Checks if signature is a legal method signature.
5148 // Returns number of parameters
5149 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5150 const Symbol* signature,
5151 TRAPS) const {
5152 if (!_need_verify) {
5153 // make sure caller's args_size will be less than 0 even for non-static
5154 // method so it will be recomputed in compute_size_of_parameters().
5155 return -2;
5156 }
5157
5158 unsigned int args_size = 0;
5159 const char* p = (const char*)signature->bytes();
5160 unsigned int length = signature->utf8_length();
5161 const char* nextp;
5162
5173 length -= pointer_delta_as_int(nextp, p);
5174 p = nextp;
5175 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5176 }
5177 // The first non-signature thing better be a ')'
5178 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5179 length--;
5180 // Now we better just have a return value
5181 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5182 if (nextp && ((int)length == (nextp - p))) {
5183 return args_size;
5184 }
5185 }
5186 }
5187 // Report error
5188 throwIllegalSignature("Method", name, signature, THREAD);
5189 return 0;
5190 }
5191
5192 int ClassFileParser::static_field_size() const {
5193 assert(_layout_info != nullptr, "invariant");
5194 return _layout_info->_static_field_size;
5195 }
5196
5197 int ClassFileParser::total_oop_map_count() const {
5198 assert(_layout_info != nullptr, "invariant");
5199 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5200 }
5201
5202 jint ClassFileParser::layout_size() const {
5203 assert(_layout_info != nullptr, "invariant");
5204 return _layout_info->_instance_size;
5205 }
5206
5207 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5208 const Array<Method*>* methods) {
5209 assert(ik != nullptr, "invariant");
5210 assert(methods != nullptr, "invariant");
5211
5212 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5213 // (We used to do this lazily, but now we query it in Rewriter,
5214 // which is eagerly done for every method, so we might as well do it now,
5215 // when everything is fresh in memory.)
5216 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5217
5218 if (klass_id != vmSymbolID::NO_SID) {
5219 for (int j = 0; j < methods->length(); ++j) {
5220 Method* method = methods->at(j);
5221 method->init_intrinsic_id(klass_id);
5222
5223 if (CheckIntrinsics) {
5224 // Check if an intrinsic is defined for method 'method',
5299 }
5300 }
5301
5302 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5303 const ClassInstanceInfo& cl_inst_info,
5304 TRAPS) {
5305 if (_klass != nullptr) {
5306 return _klass;
5307 }
5308
5309 InstanceKlass* const ik =
5310 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5311
5312 if (is_hidden()) {
5313 mangle_hidden_class_name(ik);
5314 }
5315
5316 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5317
5318 assert(_klass == ik, "invariant");
5319 return ik;
5320 }
5321
5322 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5323 bool changed_by_loadhook,
5324 const ClassInstanceInfo& cl_inst_info,
5325 TRAPS) {
5326 assert(ik != nullptr, "invariant");
5327
5328 // Set name and CLD before adding to CLD
5329 ik->set_class_loader_data(_loader_data);
5330 ik->set_class_loader_type();
5331 ik->set_name(_class_name);
5332
5333 // Add all classes to our internal class loader list here,
5334 // including classes in the bootstrap (null) class loader.
5335 const bool publicize = !is_internal();
5336
5337 _loader_data->add_class(ik, publicize);
5338
5339 set_klass_to_deallocate(ik);
5340
5341 assert(_layout_info != nullptr, "invariant");
5342 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5343 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5344 "sanity");
5345
5346 assert(ik->is_instance_klass(), "sanity");
5347 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5348
5349 // Fill in information already parsed
5350 ik->set_should_verify_class(_need_verify);
5351
5352 // Not yet: supers are done below to support the new subtype-checking fields
5353 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5354 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5355 ik->set_has_strict_static_fields(_has_strict_static_fields);
5356
5357 if (_layout_info->_is_naturally_atomic) {
5358 ik->set_is_naturally_atomic();
5359 }
5360
5361 if (_layout_info->_must_be_atomic) {
5362 ik->set_must_be_atomic();
5363 }
5364
5365 ik->set_static_oop_field_count(_static_oop_count);
5366
5367 // this transfers ownership of a lot of arrays from
5368 // the parser onto the InstanceKlass*
5369 apply_parsed_class_metadata(ik, _java_fields_count);
5370
5371 // can only set dynamic nest-host after static nest information is set
5372 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5373 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5374 }
5375
5376 // note that is not safe to use the fields in the parser from this point on
5377 assert(nullptr == _cp, "invariant");
5378 assert(nullptr == _fieldinfo_stream, "invariant");
5379 assert(nullptr == _fieldinfo_search_table, "invariant");
5380 assert(nullptr == _fields_status, "invariant");
5381 assert(nullptr == _methods, "invariant");
5382 assert(nullptr == _inner_classes, "invariant");
5383 assert(nullptr == _nest_members, "invariant");
5384 assert(nullptr == _loadable_descriptors, "invariant");
5385 assert(nullptr == _combined_annotations, "invariant");
5386 assert(nullptr == _record_components, "invariant");
5387 assert(nullptr == _permitted_subclasses, "invariant");
5388 assert(nullptr == _inline_layout_info_array, "invariant");
5389
5390 if (_has_localvariable_table) {
5391 ik->set_has_localvariable_table(true);
5392 }
5393
5394 if (_has_final_method) {
5395 ik->set_has_final_method();
5396 }
5397
5398 ik->copy_method_ordering(_method_ordering, CHECK);
5399 // The InstanceKlass::_methods_jmethod_ids cache
5400 // is managed on the assumption that the initial cache
5401 // size is equal to the number of methods in the class. If
5402 // that changes, then InstanceKlass::idnum_can_increment()
5403 // has to be changed accordingly.
5404 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5405
5406 ik->set_this_class_index(_this_class_index);
5407
5408 if (_is_hidden) {
5445 if ((_num_miranda_methods > 0) ||
5446 // if this class introduced new miranda methods or
5447 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5448 // super class exists and this class inherited miranda methods
5449 ) {
5450 ik->set_has_miranda_methods(); // then set a flag
5451 }
5452
5453 // Fill in information needed to compute superclasses.
5454 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5455 ik->set_transitive_interfaces(_transitive_interfaces);
5456 ik->set_local_interfaces(_local_interfaces);
5457 _transitive_interfaces = nullptr;
5458 _local_interfaces = nullptr;
5459
5460 // Initialize itable offset tables
5461 klassItable::setup_itable_offset_table(ik);
5462
5463 // Compute transitive closure of interfaces this class implements
5464 // Do final class setup
5465 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5466 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5467 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5468 }
5469
5470 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5471 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5472 ik->set_has_contended_annotations(true);
5473 }
5474
5475 // Fill in has_finalizer and layout_helper
5476 set_precomputed_flags(ik);
5477
5478 // check if this class can access its super class
5479 check_super_class_access(ik, CHECK);
5480
5481 // check if this class can access its superinterfaces
5482 check_super_interface_access(ik, CHECK);
5483
5484 // check if this class overrides any final method
5485 check_final_method_override(ik, CHECK);
5506
5507 assert(_all_mirandas != nullptr, "invariant");
5508
5509 // Generate any default methods - default methods are public interface methods
5510 // that have a default implementation. This is new with Java 8.
5511 if (_has_nonstatic_concrete_methods) {
5512 DefaultMethods::generate_default_methods(ik,
5513 _all_mirandas,
5514 CHECK);
5515 }
5516
5517 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5518 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5519 !module_entry->has_default_read_edges()) {
5520 if (!module_entry->set_has_default_read_edges()) {
5521 // We won a potential race
5522 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5523 }
5524 }
5525
5526 if (is_inline_type()) {
5527 InlineKlass* vk = InlineKlass::cast(ik);
5528 vk->set_payload_alignment(_layout_info->_payload_alignment);
5529 vk->set_payload_offset(_layout_info->_payload_offset);
5530 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5531 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5532 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5533 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5534 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5535 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5536 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5537 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5538 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5539 vk->initialize_calling_convention(CHECK);
5540 }
5541
5542 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5543 && _class_name != vmSymbols::java_lang_Object()) {
5544 // Both abstract and concrete value classes need a field map for acmp
5545 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5546 // Current format of acmp maps:
5547 // All maps are stored contiguously in a single int array because it might
5548 // be too early to instantiate an Object array (to be investigated)
5549 // Format is:
5550 // [number_of_nonoop_entries][offset0][size[0][offset1][size1]...[oop_offset0][oop_offset1]...
5551 // ^ ^
5552 // | |
5553 // --------------------- Pair of integer describing a segment of
5554 // contiguous non-oop fields
5555 // First element is the number of segment of contiguous non-oop fields
5556 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5557 // the offset then the size.
5558 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5559 // per oop field, containing the offset of the field.
5560 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5561 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5562 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1;
5563
5564 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK);
5565 typeArrayHandle map_h(THREAD, map);
5566 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK);
5567
5568 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5569 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length());
5570 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5571 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first);
5572 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second);
5573
5574 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data.
5575 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first);
5576 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second);
5577 }
5578 int oop_map_start = nonoop_acmp_map_size + 1;
5579 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5580 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5581 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5582 }
5583 assert(acmp_maps_array->length() == map->length(), "sanity");
5584 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5585 ik->set_acmp_maps_array(acmp_maps_array);
5586 }
5587
5588 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5589
5590 if (!is_internal()) {
5591 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5592
5593 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5594 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5595 log_is_enabled(Info, class, preview)) {
5596 ResourceMark rm;
5597 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5598 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5599 }
5600
5601 if (log_is_enabled(Debug, class, resolve)) {
5602 ResourceMark rm;
5603 // print out the superclass.
5604 const char * from = ik->external_name();
5605 if (ik->super() != nullptr) {
5606 log_debug(class, resolve)("%s %s (super)",
5607 from,
5648 const ClassLoadInfo* cl_info,
5649 Publicity pub_level,
5650 TRAPS) :
5651 _stream(stream),
5652 _class_name(nullptr),
5653 _loader_data(loader_data),
5654 _is_hidden(cl_info->is_hidden()),
5655 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5656 _orig_cp_size(0),
5657 _static_oop_count(0),
5658 _super_klass(),
5659 _cp(nullptr),
5660 _fieldinfo_stream(nullptr),
5661 _fieldinfo_search_table(nullptr),
5662 _fields_status(nullptr),
5663 _methods(nullptr),
5664 _inner_classes(nullptr),
5665 _nest_members(nullptr),
5666 _nest_host(0),
5667 _permitted_subclasses(nullptr),
5668 _loadable_descriptors(nullptr),
5669 _record_components(nullptr),
5670 _local_interfaces(nullptr),
5671 _local_interface_indexes(nullptr),
5672 _transitive_interfaces(nullptr),
5673 _combined_annotations(nullptr),
5674 _class_annotations(nullptr),
5675 _class_type_annotations(nullptr),
5676 _fields_annotations(nullptr),
5677 _fields_type_annotations(nullptr),
5678 _klass(nullptr),
5679 _klass_to_deallocate(nullptr),
5680 _parsed_annotations(nullptr),
5681 _layout_info(nullptr),
5682 _inline_layout_info_array(nullptr),
5683 _temp_field_info(nullptr),
5684 _method_ordering(nullptr),
5685 _all_mirandas(nullptr),
5686 _vtable_size(0),
5687 _itable_size(0),
5688 _num_miranda_methods(0),
5689 _protection_domain(cl_info->protection_domain()),
5690 _access_flags(),
5691 _pub_level(pub_level),
5692 _bad_constant_seen(0),
5693 _synthetic_flag(false),
5694 _sde_length(false),
5695 _sde_buffer(nullptr),
5696 _sourcefile_index(0),
5697 _generic_signature_index(0),
5698 _major_version(0),
5699 _minor_version(0),
5700 _this_class_index(0),
5701 _super_class_index(0),
5702 _itfs_len(0),
5703 _java_fields_count(0),
5704 _need_verify(false),
5705 _has_nonstatic_concrete_methods(false),
5706 _declares_nonstatic_concrete_methods(false),
5707 _has_localvariable_table(false),
5708 _has_final_method(false),
5709 _has_contended_fields(false),
5710 _has_aot_runtime_setup_method(false),
5711 _has_strict_static_fields(false),
5712 _is_naturally_atomic(false),
5713 _must_be_atomic(true),
5714 _has_loosely_consistent_annotation(false),
5715 _has_finalizer(false),
5716 _has_empty_finalizer(false),
5717 _max_bootstrap_specifier_index(-1) {
5718
5719 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5720 _class_name->increment_refcount();
5721
5722 assert(_loader_data != nullptr, "invariant");
5723 assert(stream != nullptr, "invariant");
5724 assert(_stream != nullptr, "invariant");
5725 assert(_stream->buffer() == _stream->current(), "invariant");
5726 assert(_class_name != nullptr, "invariant");
5727 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5728
5729 // Figure out whether we can skip format checking (matching classic VM behavior)
5730 // Always verify CFLH bytes from the user agents.
5731 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5732
5733 // synch back verification state to stream to check for truncation.
5734 stream->set_need_verify(_need_verify);
5735
5736 parse_stream(stream, CHECK);
5737
5738 post_process_parsed_stream(stream, _cp, CHECK);
5739 }
5740
5741 void ClassFileParser::clear_class_metadata() {
5742 // metadata created before the instance klass is created. Must be
5743 // deallocated if classfile parsing returns an error.
5744 _cp = nullptr;
5745 _fieldinfo_stream = nullptr;
5746 _fieldinfo_search_table = nullptr;
5747 _fields_status = nullptr;
5748 _methods = nullptr;
5749 _inner_classes = nullptr;
5750 _nest_members = nullptr;
5751 _permitted_subclasses = nullptr;
5752 _loadable_descriptors = nullptr;
5753 _combined_annotations = nullptr;
5754 _class_annotations = _class_type_annotations = nullptr;
5755 _fields_annotations = _fields_type_annotations = nullptr;
5756 _record_components = nullptr;
5757 _inline_layout_info_array = nullptr;
5758 }
5759
5760 // Destructor to clean up
5761 ClassFileParser::~ClassFileParser() {
5762 _class_name->decrement_refcount();
5763
5764 if (_cp != nullptr) {
5765 MetadataFactory::free_metadata(_loader_data, _cp);
5766 }
5767
5768 if (_fieldinfo_stream != nullptr) {
5769 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5770 }
5771 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5772
5773 if (_fields_status != nullptr) {
5774 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5775 }
5776
5777 if (_inline_layout_info_array != nullptr) {
5778 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5779 }
5780
5781 if (_methods != nullptr) {
5782 // Free methods
5783 InstanceKlass::deallocate_methods(_loader_data, _methods);
5784 }
5785
5786 // beware of the Universe::empty_blah_array!!
5787 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5788 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5789 }
5790
5791 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5792 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5793 }
5794
5795 if (_record_components != nullptr) {
5796 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5797 }
5798
5799 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5800 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5801 }
5802
5803 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5804 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5805 }
5806
5807 // Free interfaces
5808 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5809 _local_interfaces, _transitive_interfaces);
5810
5811 if (_combined_annotations != nullptr) {
5812 // After all annotations arrays have been created, they are installed into the
5813 // Annotations object that will be assigned to the InstanceKlass being created.
5814
5815 // Deallocate the Annotations object and the installed annotations arrays.
5816 _combined_annotations->deallocate_contents(_loader_data);
5817
5818 // If the _combined_annotations pointer is non-null,
5819 // then the other annotations fields should have been cleared.
5820 assert(_class_annotations == nullptr, "Should have been cleared");
5821 assert(_class_type_annotations == nullptr, "Should have been cleared");
5822 assert(_fields_annotations == nullptr, "Should have been cleared");
5823 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5824 } else {
5825 // If the annotations arrays were not installed into the Annotations object,
5826 // then they have to be deallocated explicitly.
5886
5887 assert(cp_size == (u2)cp->length(), "invariant");
5888
5889 // ACCESS FLAGS
5890 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5891
5892 // Access flags
5893 u2 flags;
5894 // JVM_ACC_MODULE is defined in JDK-9 and later.
5895 if (_major_version >= JAVA_9_VERSION) {
5896 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5897 } else {
5898 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5899 }
5900
5901 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5902 // Set abstract bit for old class files for backward compatibility
5903 flags |= JVM_ACC_ABSTRACT;
5904 }
5905
5906 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5907 if (!supports_inline_types()) {
5908 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5909 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5910 if (!is_module && !is_interface) {
5911 flags |= JVM_ACC_IDENTITY;
5912 }
5913 }
5914
5915 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5916
5917 short bad_constant = class_bad_constant_seen();
5918 if (bad_constant != 0) {
5919 // Do not throw CFE until after the access_flags are checked because if
5920 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5921 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5922 return;
5923 }
5924
5925 _access_flags.set_flags(flags);
5926
5927 // This class and superclass
5928 _this_class_index = stream->get_u2_fast();
5929 guarantee_property(
5930 valid_cp_range(_this_class_index, cp_size) &&
5931 cp->tag_at(_this_class_index).is_unresolved_klass(),
5932 "Invalid this class index %u in constant pool in class file %s",
5933 _this_class_index, CHECK);
5934
5998 }
5999 ls.cr();
6000 }
6001 }
6002
6003 // SUPERKLASS
6004 _super_class_index = stream->get_u2_fast();
6005 check_super_class(cp,
6006 _super_class_index,
6007 _need_verify,
6008 CHECK);
6009
6010 // Interfaces
6011 _itfs_len = stream->get_u2_fast();
6012 parse_interfaces(stream,
6013 _itfs_len,
6014 cp,
6015 &_has_nonstatic_concrete_methods,
6016 CHECK);
6017
6018 // Fields (offsets are filled in later)
6019 parse_fields(stream,
6020 _access_flags,
6021 cp,
6022 cp_size,
6023 &_java_fields_count,
6024 CHECK);
6025
6026 assert(_temp_field_info != nullptr, "invariant");
6027
6028 // Methods
6029 parse_methods(stream,
6030 is_interface(),
6031 !is_identity_class(),
6032 is_abstract_class(),
6033 &_has_localvariable_table,
6034 &_has_final_method,
6035 &_declares_nonstatic_concrete_methods,
6036 CHECK);
6037
6038 assert(_methods != nullptr, "invariant");
6039
6040 if (_declares_nonstatic_concrete_methods) {
6041 _has_nonstatic_concrete_methods = true;
6042 }
6043
6044 // Additional attributes/annotations
6045 _parsed_annotations = new ClassAnnotationCollector();
6046 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6047
6048 assert(_inner_classes != nullptr, "invariant");
6049
6050 // Finalize the Annotations metadata object,
6051 // now that all annotation arrays have been created.
6052 create_combined_annotations(CHECK);
6100 }
6101
6102 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6103 ConstantPool* cp,
6104 TRAPS) {
6105 assert(stream != nullptr, "invariant");
6106 assert(stream->at_eos(), "invariant");
6107 assert(cp != nullptr, "invariant");
6108 assert(_loader_data != nullptr, "invariant");
6109
6110 if (_class_name == vmSymbols::java_lang_Object()) {
6111 precond(_super_class_index == 0);
6112 precond(_super_klass == nullptr);
6113 guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6114 "java.lang.Object cannot implement an interface in class file %s",
6115 CHECK);
6116 } else {
6117 // Set _super_klass after class file is parsed and format is checked
6118 assert(_super_class_index > 0, "any class other than Object must have a super class");
6119 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6120 if (is_interface()) {
6121 // Before attempting to resolve the superclass, check for class format
6122 // errors not checked yet.
6123 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6124 "Interfaces must have java.lang.Object as superclass in class file %s",
6125 CHECK);
6126 }
6127 Handle loader(THREAD, _loader_data->class_loader());
6128 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6129 // fast path to avoid lookup
6130 _super_klass = vmClasses::Object_klass();
6131 } else {
6132 _super_klass = (const InstanceKlass*)
6133 SystemDictionary::resolve_super_or_fail(_class_name,
6134 super_class_name,
6135 loader,
6136 true,
6137 CHECK);
6138 }
6139 }
6140
6141 if (_super_klass != nullptr) {
6142 if (_super_klass->is_interface()) {
6143 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6144 return;
6145 }
6146
6147 if (_super_klass->is_final()) {
6148 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6149 return;
6150 }
6151
6152 if (Arguments::is_valhalla_enabled()) {
6153 check_identity_and_value_modifiers(this, _super_klass, CHECK);
6154 }
6155
6156 if (_super_klass->has_nonstatic_concrete_methods()) {
6157 _has_nonstatic_concrete_methods = true;
6158 }
6159 }
6160
6161 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6162 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6163 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6164 _class_name->as_klass_external_name()));
6165 }
6166
6167 // Determining if the class allows tearing or not (default is not)
6168 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6169 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6170 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6171 // Conditions above are not sufficient to determine atomicity requirements,
6172 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6173 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6174 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6175 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6176 _must_be_atomic = false;
6177 }
6178 // Apply VM options override
6179 if (*ForceNonTearable != '\0') {
6180 // Allow a command line switch to force the same atomicity property:
6181 const char* class_name_str = _class_name->as_C_string();
6182 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6183 _must_be_atomic = true;
6184 }
6185 }
6186 }
6187
6188 int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6189 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6190 if (_local_interface_indexes != nullptr) {
6191 for (int i = 0; i < _local_interface_indexes->length(); i++) {
6192 u2 interface_index = _local_interface_indexes->at(i);
6193 Klass* interf;
6194 if (cp->tag_at(interface_index).is_klass()) {
6195 interf = cp->resolved_klass_at(interface_index);
6196 } else {
6197 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
6198
6199 // Don't need to check legal name because it's checked when parsing constant pool.
6200 // But need to make sure it's not an array type.
6201 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6202 "Bad interface name in class file %s", CHECK);
6203
6204 // Call resolve on the interface class name with class circularity checking
6205 interf = SystemDictionary::resolve_super_or_fail(
6206 _class_name,
6207 unresolved_klass,
6208 Handle(THREAD, _loader_data->class_loader()),
6209 false,
6210 CHECK);
6211 }
6212
6213 if (!interf->is_interface()) {
6214 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6215 err_msg("class %s can not implement %s, because it is not an interface (%s)",
6216 _class_name->as_klass_external_name(),
6217 interf->external_name(),
6218 interf->class_in_module_of_loader()));
6219 }
6220
6221 if (Arguments::is_valhalla_enabled()) {
6222 // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6223 check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6224 }
6225
6226 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6227 _has_nonstatic_concrete_methods = true;
6228 }
6229 _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6230 }
6231 }
6232 assert(_local_interfaces != nullptr, "invariant");
6233
6234 // Compute the transitive list of all unique interfaces implemented by this class
6235 _transitive_interfaces =
6236 compute_transitive_interfaces(_super_klass,
6237 _local_interfaces,
6238 _loader_data,
6239 CHECK);
6240
6241 assert(_transitive_interfaces != nullptr, "invariant");
6242
6243 // sort methods
6244 _method_ordering = sort_methods(_methods);
6245
6246 _all_mirandas = new GrowableArray<Method*>(20);
6247
6248 Handle loader(THREAD, _loader_data->class_loader());
6249 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6250 &_num_miranda_methods,
6251 _all_mirandas,
6252 _super_klass,
6253 _methods,
6254 _access_flags,
6255 _major_version,
6256 loader,
6257 _class_name,
6258 _local_interfaces);
6259
6260 // Size of Java itable (in words)
6261 _itable_size = is_interface() ? 0 :
6262 klassItable::compute_itable_size(_transitive_interfaces);
6263
6264 assert(_parsed_annotations != nullptr, "invariant");
6265
6266 if (Arguments::is_valhalla_enabled()) {
6267 for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6268 FieldInfo fieldinfo = *it;
6269 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6270 Symbol* sig = fieldinfo.signature(cp);
6271 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6272 // Pre-load classes of null-free fields that are candidate for flattening
6273 TempNewSymbol s = Signature::strip_envelope(sig);
6274 if (s == _class_name) {
6275 THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6276 err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6277 }
6278 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6279 "Cause: a null-free non-static field is declared with this type",
6280 s->as_C_string(), _class_name->as_C_string());
6281 InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection(_class_name, s,
6282 Handle(THREAD,
6283 _loader_data->class_loader()),
6284 false, THREAD);
6285 if (HAS_PENDING_EXCEPTION) {
6286 log_info(class, preload)("Preloading of class %s during loading of class %s "
6287 "(cause: null-free non-static field) failed: %s",
6288 s->as_C_string(), _class_name->as_C_string(),
6289 PENDING_EXCEPTION->klass()->name()->as_C_string());
6290 return; // Exception is still pending
6291 }
6292 assert(klass != nullptr, "Sanity check");
6293 InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6294 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6295 log_info(class, preload)("Preloading of class %s during loading of class %s "
6296 "(cause: null-free non-static field) succeeded",
6297 s->as_C_string(), _class_name->as_C_string());
6298 } else if (Signature::has_envelope(sig) && PreloadClasses) {
6299 // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6300 // Those classes would be required later for the flattening of nullable inline type fields
6301 TempNewSymbol name = Signature::strip_envelope(sig);
6302 if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6303 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6304 "Cause: field type in LoadableDescriptors attribute",
6305 name->as_C_string(), _class_name->as_C_string());
6306 oop loader = loader_data()->class_loader();
6307 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6308 Handle(THREAD, loader),
6309 false, THREAD);
6310
6311 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6312
6313 if (klass != nullptr) {
6314 if (klass->is_inline_klass()) {
6315 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6316 log_info(class, preload)("Preloading of class %s during loading of class %s "
6317 "(cause: field type in LoadableDescriptors attribute) succeeded",
6318 name->as_C_string(), _class_name->as_C_string());
6319 } else {
6320 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log this
6321 log_info(class, preload)("Preloading of class %s during loading of class %s "
6322 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6323 name->as_C_string(), _class_name->as_C_string());
6324 }
6325 } else {
6326 log_info(class, preload)("Preloading of class %s during loading of class %s "
6327 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6328 name->as_C_string(), _class_name->as_C_string(),
6329 PENDING_EXCEPTION->klass()->name()->as_C_string());
6330
6331 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6332 // impact loading of current class.
6333 CLEAR_PENDING_EXCEPTION;
6334 }
6335 } else {
6336 // Just poking the system dictionary to see if the class has already be loaded. Looking for migrated classes
6337 // used when --enable-preview when jdk isn't compiled with --enable-preview so doesn't include LoadableDescriptors.
6338 // This is temporary.
6339 oop loader = loader_data()->class_loader();
6340 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6341 if (klass != nullptr && klass->is_inline_klass()) {
6342 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6343 log_info(class, preload)("Preloading of class %s during loading of class %s "
6344 "(cause: field type not in LoadableDescriptors attribute) succeeded",
6345 name->as_C_string(), _class_name->as_C_string());
6346 }
6347 }
6348 }
6349 }
6350 }
6351
6352 _layout_info = new FieldLayoutInfo();
6353 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6354 _parsed_annotations->is_contended(), is_inline_type(),
6355 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6356 _must_be_atomic, _layout_info, _inline_layout_info_array);
6357 lb.build_layout();
6358
6359 // If it turned out that we didn't inline any of the fields, we deallocate
6360 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6361 // transferred to the allocated InstanceKlass.
6362 if (_inline_layout_info_array != nullptr && !_layout_info->_has_inlined_fields) {
6363 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6364 _inline_layout_info_array = nullptr;
6365 }
6366
6367 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6368 _fieldinfo_stream =
6369 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6370 injected_fields_count, loader_data(), CHECK);
6371 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6372 _fields_status =
6373 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6374 FieldStatus(0), CHECK);
6375
6376 // Strict static fields track initialization status from the beginning of time.
6377 // After this class runs <clinit>, they will be verified as being "not unset".
6378 // See Step 8 of InstanceKlass::initialize_impl.
6379 if (_has_strict_static_fields) {
6380 bool found_one = false;
6381 for (int i = 0; i < _temp_field_info->length(); i++) {
6382 FieldInfo& fi = *_temp_field_info->adr_at(i);
6383 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6384 found_one = true;
6385 if (fi.initializer_index() != 0) {
6386 // skip strict static fields with ConstantValue attributes
6387 } else {
6388 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6389 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6390 }
6391 }
6392 }
6393 assert(found_one == _has_strict_static_fields,
6394 "correct prediction = %d", (int)_has_strict_static_fields);
6395 }
6396 }
6397
6398 void ClassFileParser::set_klass(InstanceKlass* klass) {
6399
6400 #ifdef ASSERT
6401 if (klass != nullptr) {
6402 assert(nullptr == _klass, "leaking?");
6403 }
6404 #endif
6405
6406 _klass = klass;
6407 }
6408
6409 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6410 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6411
6412 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6413 // never allocated for an InstanceKlass which has no need for this information.
6414 if (_inline_layout_info_array == nullptr) {
6415 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6416 java_fields_count(),
6417 CHECK);
6418 }
6419
6420 // Set the Klass for the field's index
6421 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6422 }
6423
6424 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6425
6426 #ifdef ASSERT
6427 if (klass != nullptr) {
6428 assert(nullptr == _klass_to_deallocate, "leaking?");
6429 }
6430 #endif
6431
6432 _klass_to_deallocate = klass;
6433 }
6434
6435 // Caller responsible for ResourceMark
6436 // clone stream with rewound position
6437 const ClassFileStream* ClassFileParser::clone_stream() const {
6438 assert(_stream != nullptr, "invariant");
6439
6440 return _stream->clone();
6441 }
6442
6443 ReferenceType ClassFileParser::super_reference_type() const {
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