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 "precompiled.hpp"
25 #include "jvm.h"
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 "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/constantPool.inline.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/instanceKlass.inline.hpp"
53 #include "oops/instanceMirrorKlass.hpp"
54 #include "oops/klass.inline.hpp"
55 #include "oops/klassVtable.hpp"
56 #include "oops/metadata.hpp"
57 #include "oops/method.inline.hpp"
58 #include "oops/oop.inline.hpp"
59 #include "oops/recordComponent.hpp"
60 #include "oops/symbol.hpp"
61 #include "prims/jvmtiExport.hpp"
62 #include "prims/jvmtiThreadState.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/fieldDescriptor.inline.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/javaCalls.hpp"
67 #include "runtime/os.hpp"
68 #include "runtime/perfData.hpp"
69 #include "runtime/reflection.hpp"
70 #include "runtime/safepointVerifiers.hpp"
71 #include "runtime/signature.hpp"
72 #include "runtime/timer.hpp"
73 #include "services/classLoadingService.hpp"
74 #include "services/threadService.hpp"
75 #include "utilities/align.hpp"
76 #include "utilities/bitMap.inline.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/formatBuffer.hpp"
79 #include "utilities/exceptions.hpp"
80 #include "utilities/globalDefinitions.hpp"
81 #include "utilities/growableArray.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/ostream.hpp"
84 #include "utilities/resourceHash.hpp"
85 #include "utilities/utf8.hpp"
86
87 #if INCLUDE_CDS
88 #include "classfile/systemDictionaryShared.hpp"
89 #endif
90 #if INCLUDE_JFR
91 #include "jfr/support/jfrTraceIdExtension.hpp"
92 #endif
93
94 // We generally try to create the oops directly when parsing, rather than
95 // allocating temporary data structures and copying the bytes twice. A
96 // temporary area is only needed when parsing utf8 entries in the constant
97 // pool and when parsing line number tables.
98
99 // We add assert in debug mode when class format is not checked.
100
101 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
102 #define JAVA_MIN_SUPPORTED_VERSION 45
103 #define JAVA_PREVIEW_MINOR_VERSION 65535
104
122 #define JAVA_9_VERSION 53
123
124 #define JAVA_10_VERSION 54
125
126 #define JAVA_11_VERSION 55
127
128 #define JAVA_12_VERSION 56
129
130 #define JAVA_13_VERSION 57
131
132 #define JAVA_14_VERSION 58
133
134 #define JAVA_15_VERSION 59
135
136 #define JAVA_16_VERSION 60
137
138 #define JAVA_17_VERSION 61
139
140 #define JAVA_18_VERSION 62
141
142 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
143 assert((bad_constant == JVM_CONSTANT_Module ||
144 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
145 "Unexpected bad constant pool entry");
146 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
147 }
148
149 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
150 ConstantPool* cp,
151 const int length,
152 TRAPS) {
153 assert(stream != NULL, "invariant");
154 assert(cp != NULL, "invariant");
155
156 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
157 // this function (_current can be allocated in a register, with scalar
158 // replacement of aggregates). The _current pointer is copied back to
159 // stream() when this function returns. DON'T call another method within
160 // this method that uses stream().
161 const ClassFileStream cfs1 = *stream;
162 const ClassFileStream* const cfs = &cfs1;
163
164 assert(cfs->allocated_on_stack(), "should be local");
165 debug_only(const u1* const old_current = stream->current();)
166
167 // Used for batching symbol allocations.
168 const char* names[SymbolTable::symbol_alloc_batch_size];
169 int lengths[SymbolTable::symbol_alloc_batch_size];
170 int indices[SymbolTable::symbol_alloc_batch_size];
171 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
172 int names_count = 0;
173
174 // parsing Index 0 is unused
175 for (int index = 1; index < length; index++) {
176 // Each of the following case guarantees one more byte in the stream
177 // for the following tag or the access_flags following constant pool,
178 // so we don't need bounds-check for reading tag.
179 const u1 tag = cfs->get_u1_fast();
180 switch (tag) {
181 case JVM_CONSTANT_Class : {
182 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
183 const u2 name_index = cfs->get_u2_fast();
184 cp->klass_index_at_put(index, name_index);
185 break;
186 }
187 case JVM_CONSTANT_Fieldref: {
188 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
189 const u2 class_index = cfs->get_u2_fast();
190 const u2 name_and_type_index = cfs->get_u2_fast();
191 cp->field_at_put(index, class_index, name_and_type_index);
192 break;
193 }
194 case JVM_CONSTANT_Methodref: {
195 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
196 const u2 class_index = cfs->get_u2_fast();
197 const u2 name_and_type_index = cfs->get_u2_fast();
198 cp->method_at_put(index, class_index, name_and_type_index);
199 break;
200 }
201 case JVM_CONSTANT_InterfaceMethodref: {
482 check_property(valid_symbol_at(name_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 name_ref_index, CHECK);
485 check_property(valid_symbol_at(signature_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 signature_ref_index, CHECK);
488 break;
489 }
490 case JVM_CONSTANT_Utf8:
491 break;
492 case JVM_CONSTANT_UnresolvedClass: // fall-through
493 case JVM_CONSTANT_UnresolvedClassInError: {
494 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
495 break;
496 }
497 case JVM_CONSTANT_ClassIndex: {
498 const int class_index = cp->klass_index_at(index);
499 check_property(valid_symbol_at(class_index),
500 "Invalid constant pool index %u in class file %s",
501 class_index, CHECK);
502 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
503 break;
504 }
505 case JVM_CONSTANT_StringIndex: {
506 const int string_index = cp->string_index_at(index);
507 check_property(valid_symbol_at(string_index),
508 "Invalid constant pool index %u in class file %s",
509 string_index, CHECK);
510 Symbol* const sym = cp->symbol_at(string_index);
511 cp->unresolved_string_at_put(index, sym);
512 break;
513 }
514 case JVM_CONSTANT_MethodHandle: {
515 const int ref_index = cp->method_handle_index_at(index);
516 check_property(valid_cp_range(ref_index, length),
517 "Invalid constant pool index %u in class file %s",
518 ref_index, CHECK);
519 const constantTag tag = cp->tag_at(ref_index);
520 const int ref_kind = cp->method_handle_ref_kind_at(index);
521
522 switch (ref_kind) {
682 cp->signature_ref_index_at(name_and_type_ref_index);
683 const Symbol* const name = cp->symbol_at(name_ref_index);
684 const Symbol* const signature = cp->symbol_at(signature_ref_index);
685 if (tag == JVM_CONSTANT_Fieldref) {
686 if (_need_verify) {
687 // Field name and signature are verified above, when iterating NameAndType_info.
688 // Need only to be sure signature is non-zero length and the right type.
689 if (Signature::is_method(signature)) {
690 throwIllegalSignature("Field", name, signature, CHECK);
691 }
692 }
693 } else {
694 if (_need_verify) {
695 // Method name and signature are individually verified above, when iterating
696 // NameAndType_info. Need to check here that signature is non-zero length and
697 // the right type.
698 if (!Signature::is_method(signature)) {
699 throwIllegalSignature("Method", name, signature, CHECK);
700 }
701 }
702 // If a class method name begins with '<', it must be "<init>" and have void signature.
703 const unsigned int name_len = name->utf8_length();
704 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
705 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
706 if (name != vmSymbols::object_initializer_name()) {
707 classfile_parse_error(
708 "Bad method name at constant pool index %u in class file %s",
709 name_ref_index, THREAD);
710 return;
711 } else if (!Signature::is_void_method(signature)) { // must have void signature.
712 throwIllegalSignature("Method", name, signature, CHECK);
713 }
714 }
715 }
716 break;
717 }
718 case JVM_CONSTANT_MethodHandle: {
719 const int ref_index = cp->method_handle_index_at(index);
720 const int ref_kind = cp->method_handle_ref_kind_at(index);
721 switch (ref_kind) {
722 case JVM_REF_invokeVirtual:
723 case JVM_REF_invokeStatic:
724 case JVM_REF_invokeSpecial:
725 case JVM_REF_newInvokeSpecial: {
726 const int name_and_type_ref_index =
727 cp->name_and_type_ref_index_at(ref_index);
728 const int name_ref_index =
729 cp->name_ref_index_at(name_and_type_ref_index);
730 const Symbol* const name = cp->symbol_at(name_ref_index);
731 if (ref_kind == JVM_REF_newInvokeSpecial) {
732 if (name != vmSymbols::object_initializer_name()) {
733 classfile_parse_error(
734 "Bad constructor name at constant pool index %u in class file %s",
735 name_ref_index, THREAD);
736 return;
737 }
738 } else {
739 if (name == vmSymbols::object_initializer_name()) {
740 classfile_parse_error(
741 "Bad method name at constant pool index %u in class file %s",
742 name_ref_index, THREAD);
743 return;
744 }
745 }
746 break;
747 }
748 // Other ref_kinds are already fully checked in previous pass.
749 } // switch(ref_kind)
750 break;
751 }
752 case JVM_CONSTANT_MethodType: {
753 const Symbol* const no_name = vmSymbols::type_name(); // place holder
754 const Symbol* const signature = cp->method_type_signature_at(index);
755 verify_legal_method_signature(no_name, signature, CHECK);
756 break;
757 }
758 case JVM_CONSTANT_Utf8: {
759 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
797 while (entry != NULL) {
798 if (entry->_name == name && entry->_sig == sig) {
799 return false;
800 }
801 entry = entry->_next;
802 }
803
804 // No duplicate is found, allocate a new entry and fill it.
805 entry = new NameSigHash();
806 entry->_name = name;
807 entry->_sig = sig;
808
809 // Insert into hash table
810 entry->_next = table[index];
811 table[index] = entry;
812
813 return true;
814 }
815
816 // Side-effects: populates the _local_interfaces field
817 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
818 const int itfs_len,
819 ConstantPool* const cp,
820 bool* const has_nonstatic_concrete_methods,
821 TRAPS) {
822 assert(stream != NULL, "invariant");
823 assert(cp != NULL, "invariant");
824 assert(has_nonstatic_concrete_methods != NULL, "invariant");
825
826 if (itfs_len == 0) {
827 _local_interfaces = Universe::the_empty_instance_klass_array();
828 } else {
829 assert(itfs_len > 0, "only called for len>0");
830 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
831
832 int index;
833 for (index = 0; index < itfs_len; index++) {
834 const u2 interface_index = stream->get_u2(CHECK);
835 Klass* interf;
836 check_property(
837 valid_klass_reference_at(interface_index),
838 "Interface name has bad constant pool index %u in class file %s",
839 interface_index, CHECK);
840 if (cp->tag_at(interface_index).is_klass()) {
841 interf = cp->resolved_klass_at(interface_index);
842 } else {
843 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
844
845 // Don't need to check legal name because it's checked when parsing constant pool.
846 // But need to make sure it's not an array type.
847 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
848 "Bad interface name in class file %s", CHECK);
849
850 // Call resolve_super so class circularity is checked
851 interf = SystemDictionary::resolve_super_or_fail(
852 _class_name,
853 unresolved_klass,
854 Handle(THREAD, _loader_data->class_loader()),
855 _protection_domain,
856 false,
857 CHECK);
858 }
859
860 if (!interf->is_interface()) {
861 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
862 err_msg("class %s can not implement %s, because it is not an interface (%s)",
863 _class_name->as_klass_external_name(),
864 interf->external_name(),
865 interf->class_in_module_of_loader()));
866 }
867
868 if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
869 *has_nonstatic_concrete_methods = true;
870 }
871 _local_interfaces->at_put(index, InstanceKlass::cast(interf));
872 }
873
874 if (!_need_verify || itfs_len <= 1) {
875 return;
876 }
877
878 // Check if there's any duplicates in interfaces
879 ResourceMark rm(THREAD);
880 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
881 NameSigHash*,
882 HASH_ROW_SIZE);
883 initialize_hashtable(interface_names);
884 bool dup = false;
885 const Symbol* name = NULL;
886 {
887 debug_only(NoSafepointVerifier nsv;)
888 for (index = 0; index < itfs_len; index++) {
889 const InstanceKlass* const k = _local_interfaces->at(index);
890 name = k->name();
891 // If no duplicates, add (name, NULL) in hashtable interface_names.
892 if (!put_after_lookup(name, NULL, interface_names)) {
893 dup = true;
894 break;
895 }
896 }
897 }
898 if (dup) {
899 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
900 name->as_C_string(), THREAD);
901 }
902 }
903 }
904
905 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
906 int constantvalue_index,
907 int signature_index,
908 TRAPS) const {
909 // Make sure the constant pool entry is of a type appropriate to this field
1354 CHECK);
1355 parsed_annotations->set_field_annotations(a);
1356 a = assemble_annotations(runtime_visible_type_annotations,
1357 runtime_visible_type_annotations_length,
1358 runtime_invisible_type_annotations,
1359 runtime_invisible_type_annotations_length,
1360 CHECK);
1361 parsed_annotations->set_field_type_annotations(a);
1362 return;
1363 }
1364
1365
1366 // Field allocation types. Used for computing field offsets.
1367
1368 enum FieldAllocationType {
1369 STATIC_OOP, // Oops
1370 STATIC_BYTE, // Boolean, Byte, char
1371 STATIC_SHORT, // shorts
1372 STATIC_WORD, // ints
1373 STATIC_DOUBLE, // aligned long or double
1374 NONSTATIC_OOP,
1375 NONSTATIC_BYTE,
1376 NONSTATIC_SHORT,
1377 NONSTATIC_WORD,
1378 NONSTATIC_DOUBLE,
1379 MAX_FIELD_ALLOCATION_TYPE,
1380 BAD_ALLOCATION_TYPE = -1
1381 };
1382
1383 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1384 BAD_ALLOCATION_TYPE, // 0
1385 BAD_ALLOCATION_TYPE, // 1
1386 BAD_ALLOCATION_TYPE, // 2
1387 BAD_ALLOCATION_TYPE, // 3
1388 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1389 NONSTATIC_SHORT, // T_CHAR = 5,
1390 NONSTATIC_WORD, // T_FLOAT = 6,
1391 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1392 NONSTATIC_BYTE, // T_BYTE = 8,
1393 NONSTATIC_SHORT, // T_SHORT = 9,
1394 NONSTATIC_WORD, // T_INT = 10,
1395 NONSTATIC_DOUBLE, // T_LONG = 11,
1396 NONSTATIC_OOP, // T_OBJECT = 12,
1397 NONSTATIC_OOP, // T_ARRAY = 13,
1398 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1399 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1400 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1401 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1402 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1403 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1404 BAD_ALLOCATION_TYPE, // 0
1405 BAD_ALLOCATION_TYPE, // 1
1406 BAD_ALLOCATION_TYPE, // 2
1407 BAD_ALLOCATION_TYPE, // 3
1408 STATIC_BYTE , // T_BOOLEAN = 4,
1409 STATIC_SHORT, // T_CHAR = 5,
1410 STATIC_WORD, // T_FLOAT = 6,
1411 STATIC_DOUBLE, // T_DOUBLE = 7,
1412 STATIC_BYTE, // T_BYTE = 8,
1413 STATIC_SHORT, // T_SHORT = 9,
1414 STATIC_WORD, // T_INT = 10,
1415 STATIC_DOUBLE, // T_LONG = 11,
1416 STATIC_OOP, // T_OBJECT = 12,
1417 STATIC_OOP, // T_ARRAY = 13,
1418 BAD_ALLOCATION_TYPE, // T_VOID = 14,
1419 BAD_ALLOCATION_TYPE, // T_ADDRESS = 15,
1420 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 16,
1421 BAD_ALLOCATION_TYPE, // T_METADATA = 17,
1422 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1423 BAD_ALLOCATION_TYPE, // T_CONFLICT = 19,
1424 };
1425
1426 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1427 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1428 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1429 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1430 return result;
1431 }
1432
1433 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1434 public:
1435 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1436
1437 FieldAllocationCount() {
1438 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1439 count[i] = 0;
1440 }
1441 }
1442
1443 void update(bool is_static, BasicType type) {
1444 FieldAllocationType atype = basic_type_to_atype(is_static, type);
1445 if (atype != BAD_ALLOCATION_TYPE) {
1446 // Make sure there is no overflow with injected fields.
1447 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1448 count[atype]++;
1449 }
1450 }
1451 };
1452
1453 // Side-effects: populates the _fields, _fields_annotations,
1454 // _fields_type_annotations fields
1455 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1456 bool is_interface,
1457 FieldAllocationCount* const fac,
1458 ConstantPool* cp,
1459 const int cp_size,
1460 u2* const java_fields_count_ptr,
1461 TRAPS) {
1462
1463 assert(cfs != NULL, "invariant");
1464 assert(fac != NULL, "invariant");
1465 assert(cp != NULL, "invariant");
1466 assert(java_fields_count_ptr != NULL, "invariant");
1467
1468 assert(NULL == _fields, "invariant");
1469 assert(NULL == _fields_annotations, "invariant");
1470 assert(NULL == _fields_type_annotations, "invariant");
1471
1472 cfs->guarantee_more(2, CHECK); // length
1473 const u2 length = cfs->get_u2_fast();
1474 *java_fields_count_ptr = length;
1475
1476 int num_injected = 0;
1477 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1478 &num_injected);
1479 const int total_fields = length + num_injected;
1480
1481 // The field array starts with tuples of shorts
1482 // [access, name index, sig index, initial value index, byte offset].
1483 // A generic signature slot only exists for field with generic
1484 // signature attribute. And the access flag is set with
1485 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1486 // signature slots are at the end of the field array and after all
1487 // other fields data.
1488 //
1489 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1490 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1491 // ...
1492 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1493 // [generic signature index]
1494 // [generic signature index]
1495 // ...
1496 //
1497 // Allocate a temporary resource array for field data. For each field,
1498 // a slot is reserved in the temporary array for the generic signature
1499 // index. After parsing all fields, the data are copied to a permanent
1500 // array and any unused slots will be discarded.
1501 ResourceMark rm(THREAD);
1502 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1503 u2,
1504 total_fields * (FieldInfo::field_slots + 1));
1505
1506 // The generic signature slots start after all other fields' data.
1507 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1508 int num_generic_signature = 0;
1509 for (int n = 0; n < length; n++) {
1510 // access_flags, name_index, descriptor_index, attributes_count
1511 cfs->guarantee_more(8, CHECK);
1512
1513 AccessFlags access_flags;
1514 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1515 verify_legal_field_modifiers(flags, is_interface, CHECK);
1516 access_flags.set_flags(flags);
1517
1518 const u2 name_index = cfs->get_u2_fast();
1519 check_property(valid_symbol_at(name_index),
1520 "Invalid constant pool index %u for field name in class file %s",
1521 name_index, CHECK);
1522 const Symbol* const name = cp->symbol_at(name_index);
1523 verify_legal_field_name(name, CHECK);
1524
1525 const u2 signature_index = cfs->get_u2_fast();
1526 check_property(valid_symbol_at(signature_index),
1527 "Invalid constant pool index %u for field signature in class file %s",
1528 signature_index, CHECK);
1529 const Symbol* const sig = cp->symbol_at(signature_index);
1530 verify_legal_field_signature(name, sig, CHECK);
1531
1532 u2 constantvalue_index = 0;
1533 bool is_synthetic = false;
1534 u2 generic_signature_index = 0;
1535 const bool is_static = access_flags.is_static();
1536 FieldAnnotationCollector parsed_annotations(_loader_data);
1537
1538 const u2 attributes_count = cfs->get_u2_fast();
1539 if (attributes_count > 0) {
1540 parse_field_attributes(cfs,
1541 attributes_count,
1542 is_static,
1543 signature_index,
1544 &constantvalue_index,
1545 &is_synthetic,
1546 &generic_signature_index,
1547 &parsed_annotations,
1548 CHECK);
1549
1550 if (parsed_annotations.field_annotations() != NULL) {
1570
1571 if (is_synthetic) {
1572 access_flags.set_is_synthetic();
1573 }
1574 if (generic_signature_index != 0) {
1575 access_flags.set_field_has_generic_signature();
1576 fa[generic_signature_slot] = generic_signature_index;
1577 generic_signature_slot ++;
1578 num_generic_signature ++;
1579 }
1580 }
1581
1582 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1583 field->initialize(access_flags.as_short(),
1584 name_index,
1585 signature_index,
1586 constantvalue_index);
1587 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1588
1589 // Update FieldAllocationCount for this kind of field
1590 fac->update(is_static, type);
1591
1592 // After field is initialized with type, we can augment it with aux info
1593 if (parsed_annotations.has_any_annotations()) {
1594 parsed_annotations.apply_to(field);
1595 if (field->is_contended()) {
1596 _has_contended_fields = true;
1597 }
1598 }
1599 }
1600
1601 int index = length;
1602 if (num_injected != 0) {
1603 for (int n = 0; n < num_injected; n++) {
1604 // Check for duplicates
1605 if (injected[n].may_be_java) {
1606 const Symbol* const name = injected[n].name();
1607 const Symbol* const signature = injected[n].signature();
1608 bool duplicate = false;
1609 for (int i = 0; i < length; i++) {
1610 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1614 duplicate = true;
1615 break;
1616 }
1617 }
1618 if (duplicate) {
1619 // These will be removed from the field array at the end
1620 continue;
1621 }
1622 }
1623
1624 // Injected field
1625 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1626 field->initialize((u2)JVM_ACC_FIELD_INTERNAL,
1627 (u2)(injected[n].name_index),
1628 (u2)(injected[n].signature_index),
1629 0);
1630
1631 const BasicType type = Signature::basic_type(injected[n].signature());
1632
1633 // Update FieldAllocationCount for this kind of field
1634 fac->update(false, type);
1635 index++;
1636 }
1637 }
1638
1639 assert(NULL == _fields, "invariant");
1640
1641 _fields =
1642 MetadataFactory::new_array<u2>(_loader_data,
1643 index * FieldInfo::field_slots + num_generic_signature,
1644 CHECK);
1645 // Sometimes injected fields already exist in the Java source so
1646 // the fields array could be too long. In that case the
1647 // fields array is trimed. Also unused slots that were reserved
1648 // for generic signature indexes are discarded.
1649 {
1650 int i = 0;
1651 for (; i < index * FieldInfo::field_slots; i++) {
1652 _fields->at_put(i, fa[i]);
1653 }
1654 for (int j = total_fields * FieldInfo::field_slots;
1655 j < generic_signature_slot; j++) {
1656 _fields->at_put(i++, fa[j]);
1657 }
1658 assert(_fields->length() == i, "");
1936 "Exception name has bad type at constant pool %u in class file %s",
1937 checked_exception, CHECK_NULL);
1938 }
1939 }
1940 // check exceptions attribute length
1941 if (_need_verify) {
1942 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1943 sizeof(u2) * size),
1944 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1945 }
1946 return checked_exceptions_start;
1947 }
1948
1949 void ClassFileParser::throwIllegalSignature(const char* type,
1950 const Symbol* name,
1951 const Symbol* sig,
1952 TRAPS) const {
1953 assert(name != NULL, "invariant");
1954 assert(sig != NULL, "invariant");
1955
1956 ResourceMark rm(THREAD);
1957 Exceptions::fthrow(THREAD_AND_LOCATION,
1958 vmSymbols::java_lang_ClassFormatError(),
1959 "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1960 name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1961 }
1962
1963 AnnotationCollector::ID
1964 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1965 const Symbol* name,
1966 const bool can_access_vm_annotations) {
1967 const vmSymbolID sid = vmSymbols::find_sid(name);
1968 // Privileged code can use all annotations. Other code silently drops some.
1969 const bool privileged = loader_data->is_boot_class_loader_data() ||
1970 loader_data->is_platform_class_loader_data() ||
1971 can_access_vm_annotations;
1972 switch (sid) {
1973 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1974 if (_location != _in_method) break; // only allow for methods
1975 if (!privileged) break; // only allow in privileged code
1976 return _method_CallerSensitive;
1977 }
1978 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1979 if (_location != _in_method) break; // only allow for methods
1980 if (!privileged) break; // only allow in privileged code
2229 runtime_visible_type_annotations_length,
2230 runtime_invisible_type_annotations,
2231 runtime_invisible_type_annotations_length,
2232 CHECK);
2233 cm->set_type_annotations(a);
2234 }
2235 }
2236
2237
2238 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2239 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2240 // Method* to save footprint, so we only know the size of the resulting Method* when the
2241 // entire method attribute is parsed.
2242 //
2243 // The promoted_flags parameter is used to pass relevant access_flags
2244 // from the method back up to the containing klass. These flag values
2245 // are added to klass's access_flags.
2246
2247 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2248 bool is_interface,
2249 const ConstantPool* cp,
2250 AccessFlags* const promoted_flags,
2251 TRAPS) {
2252 assert(cfs != NULL, "invariant");
2253 assert(cp != NULL, "invariant");
2254 assert(promoted_flags != NULL, "invariant");
2255
2256 ResourceMark rm(THREAD);
2257 // Parse fixed parts:
2258 // access_flags, name_index, descriptor_index, attributes_count
2259 cfs->guarantee_more(8, CHECK_NULL);
2260
2261 int flags = cfs->get_u2_fast();
2262 const u2 name_index = cfs->get_u2_fast();
2263 const int cp_size = cp->length();
2264 check_property(
2265 valid_symbol_at(name_index),
2266 "Illegal constant pool index %u for method name in class file %s",
2267 name_index, CHECK_NULL);
2268 const Symbol* const name = cp->symbol_at(name_index);
2270
2271 const u2 signature_index = cfs->get_u2_fast();
2272 guarantee_property(
2273 valid_symbol_at(signature_index),
2274 "Illegal constant pool index %u for method signature in class file %s",
2275 signature_index, CHECK_NULL);
2276 const Symbol* const signature = cp->symbol_at(signature_index);
2277
2278 if (name == vmSymbols::class_initializer_name()) {
2279 // We ignore the other access flags for a valid class initializer.
2280 // (JVM Spec 2nd ed., chapter 4.6)
2281 if (_major_version < 51) { // backward compatibility
2282 flags = JVM_ACC_STATIC;
2283 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2284 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2285 } else {
2286 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2287 return NULL;
2288 }
2289 } else {
2290 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2291 }
2292
2293 if (name == vmSymbols::object_initializer_name() && is_interface) {
2294 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2295 return NULL;
2296 }
2297
2298 int args_size = -1; // only used when _need_verify is true
2299 if (_need_verify) {
2300 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2301 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2302 verify_legal_method_signature(name, signature, CHECK_NULL);
2303 if (args_size > MAX_ARGS_SIZE) {
2304 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2305 return NULL;
2306 }
2307 }
2308
2309 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2310
2311 // Default values for code and exceptions attribute elements
2312 u2 max_stack = 0;
2313 u2 max_locals = 0;
2314 u4 code_length = 0;
2315 const u1* code_start = 0;
2843 _has_finalizer = true;
2844 }
2845 }
2846 if (name == vmSymbols::object_initializer_name() &&
2847 signature == vmSymbols::void_method_signature() &&
2848 m->is_vanilla_constructor()) {
2849 _has_vanilla_constructor = true;
2850 }
2851
2852 NOT_PRODUCT(m->verify());
2853 return m;
2854 }
2855
2856
2857 // The promoted_flags parameter is used to pass relevant access_flags
2858 // from the methods back up to the containing klass. These flag values
2859 // are added to klass's access_flags.
2860 // Side-effects: populates the _methods field in the parser
2861 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2862 bool is_interface,
2863 AccessFlags* promoted_flags,
2864 bool* has_final_method,
2865 bool* declares_nonstatic_concrete_methods,
2866 TRAPS) {
2867 assert(cfs != NULL, "invariant");
2868 assert(promoted_flags != NULL, "invariant");
2869 assert(has_final_method != NULL, "invariant");
2870 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2871
2872 assert(NULL == _methods, "invariant");
2873
2874 cfs->guarantee_more(2, CHECK); // length
2875 const u2 length = cfs->get_u2_fast();
2876 if (length == 0) {
2877 _methods = Universe::the_empty_method_array();
2878 } else {
2879 _methods = MetadataFactory::new_array<Method*>(_loader_data,
2880 length,
2881 NULL,
2882 CHECK);
2883
2884 for (int index = 0; index < length; index++) {
2885 Method* method = parse_method(cfs,
2886 is_interface,
2887 _cp,
2888 promoted_flags,
2889 CHECK);
2890
2891 if (method->is_final()) {
2892 *has_final_method = true;
2893 }
2894 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2895 // used for interface initialization, and default method inheritance analysis
2896 if (is_interface && !(*declares_nonstatic_concrete_methods)
2897 && !method->is_abstract() && !method->is_static()) {
2898 *declares_nonstatic_concrete_methods = true;
2899 }
2900 _methods->at_put(index, method);
2901 }
2902
2903 if (_need_verify && length > 1) {
2904 // Check duplicated methods
2905 ResourceMark rm(THREAD);
2906 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3134 valid_klass_reference_at(inner_class_info_index),
3135 "inner_class_info_index %u has bad constant type in class file %s",
3136 inner_class_info_index, CHECK_0);
3137 // Outer class index
3138 const u2 outer_class_info_index = cfs->get_u2_fast();
3139 check_property(
3140 outer_class_info_index == 0 ||
3141 valid_klass_reference_at(outer_class_info_index),
3142 "outer_class_info_index %u has bad constant type in class file %s",
3143 outer_class_info_index, CHECK_0);
3144 // Inner class name
3145 const u2 inner_name_index = cfs->get_u2_fast();
3146 check_property(
3147 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3148 "inner_name_index %u has bad constant type in class file %s",
3149 inner_name_index, CHECK_0);
3150 if (_need_verify) {
3151 guarantee_property(inner_class_info_index != outer_class_info_index,
3152 "Class is both outer and inner class in class file %s", CHECK_0);
3153 }
3154 // Access flags
3155 jint flags;
3156 // JVM_ACC_MODULE is defined in JDK-9 and later.
3157 if (_major_version >= JAVA_9_VERSION) {
3158 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3159 } else {
3160 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3161 }
3162 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3163 // Set abstract bit for old class files for backward compatibility
3164 flags |= JVM_ACC_ABSTRACT;
3165 }
3166 verify_legal_class_modifiers(flags, CHECK_0);
3167 AccessFlags inner_access_flags(flags);
3168
3169 inner_classes->at_put(index++, inner_class_info_index);
3170 inner_classes->at_put(index++, outer_class_info_index);
3171 inner_classes->at_put(index++, inner_name_index);
3172 inner_classes->at_put(index++, inner_access_flags.as_short());
3173 }
3174
3175 // 4347400: make sure there's no duplicate entry in the classes array
3176 // Also, check for circular entries.
3177 bool has_circularity = false;
3178 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3179 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3180 if (has_circularity) {
3181 // If circularity check failed then ignore InnerClasses attribute.
3987 }
3988 if (runtime_invisible_annotations != NULL) {
3989 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3990 int append = runtime_visible_annotations_length+i;
3991 annotations->at_put(append, runtime_invisible_annotations[i]);
3992 }
3993 }
3994 }
3995 return annotations;
3996 }
3997
3998 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3999 const int super_class_index,
4000 const bool need_verify,
4001 TRAPS) {
4002 assert(cp != NULL, "invariant");
4003 const InstanceKlass* super_klass = NULL;
4004
4005 if (super_class_index == 0) {
4006 check_property(_class_name == vmSymbols::java_lang_Object(),
4007 "Invalid superclass index %u in class file %s",
4008 super_class_index,
4009 CHECK_NULL);
4010 } else {
4011 check_property(valid_klass_reference_at(super_class_index),
4012 "Invalid superclass index %u in class file %s",
4013 super_class_index,
4014 CHECK_NULL);
4015 // The class name should be legal because it is checked when parsing constant pool.
4016 // However, make sure it is not an array type.
4017 bool is_array = false;
4018 if (cp->tag_at(super_class_index).is_klass()) {
4019 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4020 if (need_verify)
4021 is_array = super_klass->is_array_klass();
4022 } else if (need_verify) {
4023 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4024 }
4025 if (need_verify) {
4026 guarantee_property(!is_array,
4027 "Bad superclass name in class file %s", CHECK_NULL);
4028 }
4129 }
4130
4131 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4132 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4133 if (_nonstatic_oop_map_count > 0) {
4134 OopMapBlock* map = _nonstatic_oop_maps;
4135 OopMapBlock* last_map = last_oop_map();
4136 assert(map <= last_map, "Last less than first");
4137 while (map <= last_map) {
4138 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4139 map->offset() + map->offset_span() - heapOopSize, map->count());
4140 map++;
4141 }
4142 }
4143 }
4144
4145 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4146 print_on(st);
4147 }
4148
4149 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4150 assert(ik != NULL, "invariant");
4151
4152 const Klass* const super = ik->super();
4153
4154 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4155 // in which case we don't have to register objects as finalizable
4156 if (!_has_empty_finalizer) {
4157 if (_has_finalizer ||
4158 (super != NULL && super->has_finalizer())) {
4159 ik->set_has_finalizer();
4160 }
4161 }
4162
4163 #ifdef ASSERT
4164 bool f = false;
4165 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4166 vmSymbols::void_method_signature());
4167 if (m != NULL && !m->is_empty_method()) {
4168 f = true;
4169 }
4170
4171 // Spec doesn't prevent agent from redefinition of empty finalizer.
4172 // Despite the fact that it's generally bad idea and redefined finalizer
4173 // will not work as expected we shouldn't abort vm in this case
4174 if (!ik->has_redefined_this_or_super()) {
4175 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4176 }
4177 #endif
4178
4179 // Check if this klass supports the java.lang.Cloneable interface
4180 if (vmClasses::Cloneable_klass_loaded()) {
4181 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4182 ik->set_is_cloneable();
4183 }
4184 }
4185
4186 // Check if this klass has a vanilla default constructor
4187 if (super == NULL) {
4188 // java.lang.Object has empty default constructor
4189 ik->set_has_vanilla_constructor();
4190 } else {
4191 if (super->has_vanilla_constructor() &&
4192 _has_vanilla_constructor) {
4193 ik->set_has_vanilla_constructor();
4194 }
4195 #ifdef ASSERT
4196 bool v = false;
4197 if (super->has_vanilla_constructor()) {
4198 const Method* const constructor =
4199 ik->find_method(vmSymbols::object_initializer_name(),
4200 vmSymbols::void_method_signature());
4201 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4202 v = true;
4203 }
4204 }
4205 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4206 #endif
4207 }
4208
4209 // If it cannot be fast-path allocated, set a bit in the layout helper.
4210 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4211 assert(ik->size_helper() > 0, "layout_helper is initialized");
4212 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4213 || ik->is_abstract() || ik->is_interface()
4214 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4215 || ik->size_helper() >= FastAllocateSizeLimit) {
4216 // Forbid fast-path allocation.
4217 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4218 ik->set_layout_helper(lh);
4219 }
4220 }
4221
4222 // utility methods for appending an array with check for duplicates
4223
4224 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4225 const Array<InstanceKlass*>* const ifs) {
4226 // iterate over new interfaces
4227 for (int i = 0; i < ifs->length(); i++) {
4228 InstanceKlass* const e = ifs->at(i);
4229 assert(e->is_klass() && e->is_interface(), "just checking");
4230 // add new interface
4231 result->append_if_missing(e);
4232 }
4233 }
4234
4235 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4236 Array<InstanceKlass*>* local_ifs,
4237 ClassLoaderData* loader_data,
4238 TRAPS) {
4239 assert(local_ifs != NULL, "invariant");
4240 assert(loader_data != NULL, "invariant");
4241
4245 // Add superclass transitive interfaces size
4246 if (super != NULL) {
4247 super_size = super->transitive_interfaces()->length();
4248 max_transitive_size += super_size;
4249 }
4250 // Add local interfaces' super interfaces
4251 const int local_size = local_ifs->length();
4252 for (int i = 0; i < local_size; i++) {
4253 InstanceKlass* const l = local_ifs->at(i);
4254 max_transitive_size += l->transitive_interfaces()->length();
4255 }
4256 // Finally add local interfaces
4257 max_transitive_size += local_size;
4258 // Construct array
4259 if (max_transitive_size == 0) {
4260 // no interfaces, use canonicalized array
4261 return Universe::the_empty_instance_klass_array();
4262 } else if (max_transitive_size == super_size) {
4263 // no new local interfaces added, share superklass' transitive interface array
4264 return super->transitive_interfaces();
4265 } else if (max_transitive_size == local_size) {
4266 // only local interfaces added, share local interface array
4267 return local_ifs;
4268 } else {
4269 ResourceMark rm;
4270 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4271
4272 // Copy down from superclass
4273 if (super != NULL) {
4274 append_interfaces(result, super->transitive_interfaces());
4275 }
4276
4277 // Copy down from local interfaces' superinterfaces
4278 for (int i = 0; i < local_size; i++) {
4279 InstanceKlass* const l = local_ifs->at(i);
4280 append_interfaces(result, l->transitive_interfaces());
4281 }
4282 // Finally add local interfaces
4283 append_interfaces(result, local_ifs);
4284
4285 // length will be less than the max_transitive_size if duplicates were removed
4286 const int length = result->length();
4287 assert(length <= max_transitive_size, "just checking");
4288 Array<InstanceKlass*>* const new_result =
4289 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4290 for (int i = 0; i < length; i++) {
4291 InstanceKlass* const e = result->at(i);
4292 assert(e != NULL, "just checking");
4293 new_result->at_put(i, e);
4294 }
4295 return new_result;
4296 }
4297 }
4298
4299 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4300 assert(this_klass != NULL, "invariant");
4301 const Klass* const super = this_klass->super();
4302
4303 if (super != NULL) {
4304 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4305
4306 if (super->is_final()) {
4307 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4481 const Method* const m = methods->at(index);
4482 // if m is static and not the init method, throw a verify error
4483 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4484 ResourceMark rm(THREAD);
4485 Exceptions::fthrow(
4486 THREAD_AND_LOCATION,
4487 vmSymbols::java_lang_VerifyError(),
4488 "Illegal static method %s in interface %s",
4489 m->name()->as_C_string(),
4490 this_klass->external_name()
4491 );
4492 return;
4493 }
4494 }
4495 }
4496
4497 // utility methods for format checking
4498
4499 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4500 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4501 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4502 if (is_module) {
4503 ResourceMark rm(THREAD);
4504 Exceptions::fthrow(
4505 THREAD_AND_LOCATION,
4506 vmSymbols::java_lang_NoClassDefFoundError(),
4507 "%s is not a class because access_flag ACC_MODULE is set",
4508 _class_name->as_C_string());
4509 return;
4510 }
4511
4512 if (!_need_verify) { return; }
4513
4514 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4515 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4516 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4517 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4518 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4519 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4520 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4521 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
4522
4523 if ((is_abstract && is_final) ||
4524 (is_interface && !is_abstract) ||
4525 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4526 (!is_interface && major_gte_1_5 && is_annotation)) {
4527 ResourceMark rm(THREAD);
4528 Exceptions::fthrow(
4529 THREAD_AND_LOCATION,
4530 vmSymbols::java_lang_ClassFormatError(),
4531 "Illegal class modifiers in class %s: 0x%X",
4532 _class_name->as_C_string(), flags
4533 );
4534 return;
4535 }
4536 }
4537
4538 static bool has_illegal_visibility(jint flags) {
4539 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4540 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4541 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4542
4543 return ((is_public && is_protected) ||
4544 (is_public && is_private) ||
4545 (is_protected && is_private));
4546 }
4547
4548 // A legal major_version.minor_version must be one of the following:
4549 //
4550 // Major_version >= 45 and major_version < 56, any minor_version.
4551 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4552 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4582 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4583 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4584 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4585 return;
4586 }
4587
4588 if (!Arguments::enable_preview()) {
4589 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4590 class_name, major, minor, THREAD);
4591 return;
4592 }
4593
4594 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4595 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4596 class_name, major, minor, THREAD);
4597 }
4598 }
4599
4600 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4601 bool is_interface,
4602 TRAPS) const {
4603 if (!_need_verify) { return; }
4604
4605 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4606 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4607 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4608 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4609 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4610 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4611 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4612 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4613 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4614
4615 bool is_illegal = false;
4616
4617 if (is_interface) {
4618 if (!is_public || !is_static || !is_final || is_private ||
4619 is_protected || is_volatile || is_transient ||
4620 (major_gte_1_5 && is_enum)) {
4621 is_illegal = true;
4622 }
4623 } else { // not interface
4624 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4625 is_illegal = true;
4626 }
4627 }
4628
4629 if (is_illegal) {
4630 ResourceMark rm(THREAD);
4631 Exceptions::fthrow(
4632 THREAD_AND_LOCATION,
4633 vmSymbols::java_lang_ClassFormatError(),
4634 "Illegal field modifiers in class %s: 0x%X",
4635 _class_name->as_C_string(), flags);
4636 return;
4637 }
4638 }
4639
4640 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4641 bool is_interface,
4642 const Symbol* name,
4643 TRAPS) const {
4644 if (!_need_verify) { return; }
4645
4646 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4647 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4648 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4649 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4650 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4651 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4652 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4653 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4654 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4655 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4656 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4657 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4658 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4659 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4660
4661 bool is_illegal = false;
4662
4663 if (is_interface) {
4664 if (major_gte_8) {
4665 // Class file version is JAVA_8_VERSION or later Methods of
4666 // interfaces may set any of the flags except ACC_PROTECTED,
4667 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4668 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4669 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4670 (is_native || is_protected || is_final || is_synchronized) ||
4671 // If a specific method of a class or interface has its
4672 // ACC_ABSTRACT flag set, it must not have any of its
4673 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4674 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4675 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4676 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4677 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4678 is_illegal = true;
4679 }
4680 } else if (major_gte_1_5) {
4681 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4682 if (!is_public || is_private || is_protected || is_static || is_final ||
4683 is_synchronized || is_native || !is_abstract || is_strict) {
4684 is_illegal = true;
4685 }
4686 } else {
4687 // Class file version is pre-JAVA_1_5_VERSION
4688 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4689 is_illegal = true;
4690 }
4691 }
4692 } else { // not interface
4693 if (has_illegal_visibility(flags)) {
4694 is_illegal = true;
4695 } else {
4696 if (is_initializer) {
4697 if (is_static || is_final || is_synchronized || is_native ||
4698 is_abstract || (major_gte_1_5 && is_bridge)) {
4699 is_illegal = true;
4700 }
4701 } else { // not initializer
4702 if (is_abstract) {
4703 if ((is_final || is_native || is_private || is_static ||
4704 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4705 is_illegal = true;
4706 }
4707 }
4708 }
4709 }
4710 }
4711
4712 if (is_illegal) {
4713 ResourceMark rm(THREAD);
4714 Exceptions::fthrow(
4715 THREAD_AND_LOCATION,
4716 vmSymbols::java_lang_ClassFormatError(),
4717 "Method %s in class %s has illegal modifiers: 0x%X",
4718 name->as_C_string(), _class_name->as_C_string(), flags);
4719 return;
4720 }
4721 }
4722
4723 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4724 int length,
4725 TRAPS) const {
4726 assert(_need_verify, "only called when _need_verify is true");
4727 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4728 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4729 }
4730 }
4731
4732 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4733 // In class names, '/' separates unqualified names. This is verified in this function also.
4734 // Method names also may not contain the characters '<' or '>', unless <init>
4735 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4736 // method. Because these names have been checked as special cases before
4737 // calling this method in verify_legal_method_name.
4738 //
4856 // be taken as a field signature. Allow "void" if void_ok.
4857 // Return a pointer to just past the signature.
4858 // Return NULL if no legal signature is found.
4859 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4860 bool void_ok,
4861 unsigned int length,
4862 TRAPS) const {
4863 unsigned int array_dim = 0;
4864 while (length > 0) {
4865 switch (signature[0]) {
4866 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4867 case JVM_SIGNATURE_BOOLEAN:
4868 case JVM_SIGNATURE_BYTE:
4869 case JVM_SIGNATURE_CHAR:
4870 case JVM_SIGNATURE_SHORT:
4871 case JVM_SIGNATURE_INT:
4872 case JVM_SIGNATURE_FLOAT:
4873 case JVM_SIGNATURE_LONG:
4874 case JVM_SIGNATURE_DOUBLE:
4875 return signature + 1;
4876 case JVM_SIGNATURE_CLASS: {
4877 if (_major_version < JAVA_1_5_VERSION) {
4878 // Skip over the class name if one is there
4879 const char* const p = skip_over_field_name(signature + 1, true, --length);
4880
4881 // The next character better be a semicolon
4882 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4883 return p + 1;
4884 }
4885 }
4886 else {
4887 // Skip leading 'L' and ignore first appearance of ';'
4888 signature++;
4889 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4890 // Format check signature
4891 if (c != NULL) {
4892 int newlen = c - (char*) signature;
4893 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4894 if (!legal) {
4895 classfile_parse_error("Class name is empty or contains illegal character "
4896 "in descriptor in class file %s",
4897 THREAD);
4898 return NULL;
4899 }
4900 return signature + newlen + 1;
4901 }
4902 }
4903 return NULL;
4904 }
4905 case JVM_SIGNATURE_ARRAY:
4906 array_dim++;
4907 if (array_dim > 255) {
4923
4924 // Checks if name is a legal class name.
4925 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4926 if (!_need_verify || _relax_verify) { return; }
4927
4928 assert(name->refcount() > 0, "symbol must be kept alive");
4929 char* bytes = (char*)name->bytes();
4930 unsigned int length = name->utf8_length();
4931 bool legal = false;
4932
4933 if (length > 0) {
4934 const char* p;
4935 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4936 p = skip_over_field_signature(bytes, false, length, CHECK);
4937 legal = (p != NULL) && ((p - bytes) == (int)length);
4938 } else if (_major_version < JAVA_1_5_VERSION) {
4939 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4940 p = skip_over_field_name(bytes, true, length);
4941 legal = (p != NULL) && ((p - bytes) == (int)length);
4942 }
4943 } else {
4944 // 4900761: relax the constraints based on JSR202 spec
4945 // Class names may be drawn from the entire Unicode character set.
4946 // Identifiers between '/' must be unqualified names.
4947 // The utf8 string has been verified when parsing cpool entries.
4948 legal = verify_unqualified_name(bytes, length, LegalClass);
4949 }
4950 }
4951 if (!legal) {
4952 ResourceMark rm(THREAD);
4953 assert(_class_name != NULL, "invariant");
4954 Exceptions::fthrow(
4955 THREAD_AND_LOCATION,
4956 vmSymbols::java_lang_ClassFormatError(),
4957 "Illegal class name \"%.*s\" in class file %s", length, bytes,
4958 _class_name->as_C_string()
4959 );
4960 return;
4961 }
4962 }
5020
5021 if (!legal) {
5022 ResourceMark rm(THREAD);
5023 assert(_class_name != NULL, "invariant");
5024 Exceptions::fthrow(
5025 THREAD_AND_LOCATION,
5026 vmSymbols::java_lang_ClassFormatError(),
5027 "Illegal method name \"%.*s\" in class %s", length, bytes,
5028 _class_name->as_C_string()
5029 );
5030 return;
5031 }
5032 }
5033
5034
5035 // Checks if signature is a legal field signature.
5036 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5037 const Symbol* signature,
5038 TRAPS) const {
5039 if (!_need_verify) { return; }
5040
5041 const char* const bytes = (const char* const)signature->bytes();
5042 const unsigned int length = signature->utf8_length();
5043 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5044
5045 if (p == NULL || (p - bytes) != (int)length) {
5046 throwIllegalSignature("Field", name, signature, CHECK);
5047 }
5048 }
5049
5050 // Check that the signature is compatible with the method name. For example,
5051 // check that <init> has a void signature.
5052 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5053 const Symbol* signature,
5054 TRAPS) const {
5055 if (!_need_verify) {
5056 return;
5057 }
5058
5059 // Class initializers cannot have args for class format version >= 51.
5060 if (name == vmSymbols::class_initializer_name() &&
5061 signature != vmSymbols::void_method_signature() &&
5062 _major_version >= JAVA_7_VERSION) {
5063 throwIllegalSignature("Method", name, signature, THREAD);
5064 return;
5065 }
5066
5067 int sig_length = signature->utf8_length();
5068 if (name->utf8_length() > 0 &&
5069 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5070 sig_length > 0 &&
5071 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5072 throwIllegalSignature("Method", name, signature, THREAD);
5073 }
5074 }
5075
5076 // Checks if signature is a legal method signature.
5077 // Returns number of parameters
5078 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5079 const Symbol* signature,
5080 TRAPS) const {
5081 if (!_need_verify) {
5082 // make sure caller's args_size will be less than 0 even for non-static
5083 // method so it will be recomputed in compute_size_of_parameters().
5084 return -2;
5085 }
5086
5087 unsigned int args_size = 0;
5088 const char* p = (const char*)signature->bytes();
5089 unsigned int length = signature->utf8_length();
5090 const char* nextp;
5091
5092 // The first character must be a '('
5229 }
5230
5231 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5232 const ClassInstanceInfo& cl_inst_info,
5233 TRAPS) {
5234 if (_klass != NULL) {
5235 return _klass;
5236 }
5237
5238 InstanceKlass* const ik =
5239 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5240
5241 if (is_hidden()) {
5242 mangle_hidden_class_name(ik);
5243 }
5244
5245 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5246
5247 assert(_klass == ik, "invariant");
5248
5249 return ik;
5250 }
5251
5252 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5253 bool changed_by_loadhook,
5254 const ClassInstanceInfo& cl_inst_info,
5255 TRAPS) {
5256 assert(ik != NULL, "invariant");
5257
5258 // Set name and CLD before adding to CLD
5259 ik->set_class_loader_data(_loader_data);
5260 ik->set_name(_class_name);
5261
5262 // Add all classes to our internal class loader list here,
5263 // including classes in the bootstrap (NULL) class loader.
5264 const bool publicize = !is_internal();
5265
5266 _loader_data->add_class(ik, publicize);
5267
5268 set_klass_to_deallocate(ik);
5269
5270 assert(_field_info != NULL, "invariant");
5271 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5272 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5273 "sanity");
5274
5275 assert(ik->is_instance_klass(), "sanity");
5276 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5277
5278 // Fill in information already parsed
5279 ik->set_should_verify_class(_need_verify);
5280
5281 // Not yet: supers are done below to support the new subtype-checking fields
5282 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5283 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5284 assert(_fac != NULL, "invariant");
5285 ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5286
5287 // this transfers ownership of a lot of arrays from
5288 // the parser onto the InstanceKlass*
5289 apply_parsed_class_metadata(ik, _java_fields_count);
5290
5291 // can only set dynamic nest-host after static nest information is set
5292 if (cl_inst_info.dynamic_nest_host() != NULL) {
5293 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5294 }
5295
5296 // note that is not safe to use the fields in the parser from this point on
5297 assert(NULL == _cp, "invariant");
5298 assert(NULL == _fields, "invariant");
5299 assert(NULL == _methods, "invariant");
5300 assert(NULL == _inner_classes, "invariant");
5301 assert(NULL == _nest_members, "invariant");
5302 assert(NULL == _combined_annotations, "invariant");
5303 assert(NULL == _record_components, "invariant");
5304 assert(NULL == _permitted_subclasses, "invariant");
5305
5315 // has to be changed accordingly.
5316 ik->set_initial_method_idnum(ik->methods()->length());
5317
5318 ik->set_this_class_index(_this_class_index);
5319
5320 if (_is_hidden) {
5321 // _this_class_index is a CONSTANT_Class entry that refers to this
5322 // hidden class itself. If this class needs to refer to its own methods
5323 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5324 // _this_class_index. However, because this class is hidden (it's
5325 // not stored in SystemDictionary), _this_class_index cannot be resolved
5326 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5327 // Therefore, we must eagerly resolve _this_class_index now.
5328 ik->constants()->klass_at_put(_this_class_index, ik);
5329 }
5330
5331 ik->set_minor_version(_minor_version);
5332 ik->set_major_version(_major_version);
5333 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5334 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5335
5336 if (_is_hidden) {
5337 ik->set_is_hidden();
5338 }
5339
5340 // Set PackageEntry for this_klass
5341 oop cl = ik->class_loader();
5342 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5343 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5344 ik->set_package(cld, NULL, CHECK);
5345
5346 const Array<Method*>* const methods = ik->methods();
5347 assert(methods != NULL, "invariant");
5348 const int methods_len = methods->length();
5349
5350 check_methods_for_intrinsics(ik, methods);
5351
5352 // Fill in field values obtained by parse_classfile_attributes
5353 if (_parsed_annotations->has_any_annotations()) {
5354 _parsed_annotations->apply_to(ik);
5422
5423 assert(_all_mirandas != NULL, "invariant");
5424
5425 // Generate any default methods - default methods are public interface methods
5426 // that have a default implementation. This is new with Java 8.
5427 if (_has_nonstatic_concrete_methods) {
5428 DefaultMethods::generate_default_methods(ik,
5429 _all_mirandas,
5430 CHECK);
5431 }
5432
5433 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5434 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5435 !module_entry->has_default_read_edges()) {
5436 if (!module_entry->set_has_default_read_edges()) {
5437 // We won a potential race
5438 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5439 }
5440 }
5441
5442 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5443
5444 if (!is_internal()) {
5445 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5446
5447 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5448 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5449 log_is_enabled(Info, class, preview)) {
5450 ResourceMark rm;
5451 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5452 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5453 }
5454
5455 if (log_is_enabled(Debug, class, resolve)) {
5456 ResourceMark rm;
5457 // print out the superclass.
5458 const char * from = ik->external_name();
5459 if (ik->java_super() != NULL) {
5460 log_debug(class, resolve)("%s %s (super)",
5461 from,
5467 const int length = local_interfaces->length();
5468 for (int i = 0; i < length; i++) {
5469 const InstanceKlass* const k = local_interfaces->at(i);
5470 const char * to = k->external_name();
5471 log_debug(class, resolve)("%s %s (interface)", from, to);
5472 }
5473 }
5474 }
5475 }
5476
5477 JFR_ONLY(INIT_ID(ik);)
5478
5479 // If we reach here, all is well.
5480 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5481 // in order for it to not be destroyed in the ClassFileParser destructor.
5482 set_klass_to_deallocate(NULL);
5483
5484 // it's official
5485 set_klass(ik);
5486
5487 debug_only(ik->verify();)
5488 }
5489
5490 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5491 // Decrement the refcount in the old name, since we're clobbering it.
5492 _class_name->decrement_refcount();
5493
5494 _class_name = new_class_name;
5495 // Increment the refcount of the new name.
5496 // Now the ClassFileParser owns this name and will decrement in
5497 // the destructor.
5498 _class_name->increment_refcount();
5499 }
5500
5501 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5502 bool trusted = loader_data->is_boot_class_loader_data() ||
5503 loader_data->is_platform_class_loader_data();
5504 bool need_verify =
5505 // verifyAll
5506 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5513 Symbol* name,
5514 ClassLoaderData* loader_data,
5515 const ClassLoadInfo* cl_info,
5516 Publicity pub_level,
5517 TRAPS) :
5518 _stream(stream),
5519 _class_name(NULL),
5520 _loader_data(loader_data),
5521 _is_hidden(cl_info->is_hidden()),
5522 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5523 _orig_cp_size(0),
5524 _super_klass(),
5525 _cp(NULL),
5526 _fields(NULL),
5527 _methods(NULL),
5528 _inner_classes(NULL),
5529 _nest_members(NULL),
5530 _nest_host(0),
5531 _permitted_subclasses(NULL),
5532 _record_components(NULL),
5533 _local_interfaces(NULL),
5534 _transitive_interfaces(NULL),
5535 _combined_annotations(NULL),
5536 _class_annotations(NULL),
5537 _class_type_annotations(NULL),
5538 _fields_annotations(NULL),
5539 _fields_type_annotations(NULL),
5540 _klass(NULL),
5541 _klass_to_deallocate(NULL),
5542 _parsed_annotations(NULL),
5543 _fac(NULL),
5544 _field_info(NULL),
5545 _method_ordering(NULL),
5546 _all_mirandas(NULL),
5547 _vtable_size(0),
5548 _itable_size(0),
5549 _num_miranda_methods(0),
5550 _rt(REF_NONE),
5551 _protection_domain(cl_info->protection_domain()),
5552 _access_flags(),
5553 _pub_level(pub_level),
5554 _bad_constant_seen(0),
5555 _synthetic_flag(false),
5556 _sde_length(false),
5557 _sde_buffer(NULL),
5558 _sourcefile_index(0),
5559 _generic_signature_index(0),
5560 _major_version(0),
5561 _minor_version(0),
5562 _this_class_index(0),
5563 _super_class_index(0),
5564 _itfs_len(0),
5565 _java_fields_count(0),
5566 _need_verify(false),
5567 _relax_verify(false),
5568 _has_nonstatic_concrete_methods(false),
5569 _declares_nonstatic_concrete_methods(false),
5570 _has_final_method(false),
5571 _has_contended_fields(false),
5572 _has_finalizer(false),
5573 _has_empty_finalizer(false),
5574 _has_vanilla_constructor(false),
5575 _max_bootstrap_specifier_index(-1) {
5576
5577 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5578 _class_name->increment_refcount();
5579
5580 assert(_loader_data != NULL, "invariant");
5581 assert(stream != NULL, "invariant");
5582 assert(_stream != NULL, "invariant");
5583 assert(_stream->buffer() == _stream->current(), "invariant");
5584 assert(_class_name != NULL, "invariant");
5585 assert(0 == _access_flags.as_int(), "invariant");
5586
5587 // Figure out whether we can skip format checking (matching classic VM behavior)
5588 if (DumpSharedSpaces) {
5589 // verify == true means it's a 'remote' class (i.e., non-boot class)
5590 // Verification decision is based on BytecodeVerificationRemote flag
5591 // for those classes.
5724 cp_size, CHECK);
5725
5726 _orig_cp_size = cp_size;
5727 if (is_hidden()) { // Add a slot for hidden class name.
5728 cp_size++;
5729 }
5730
5731 _cp = ConstantPool::allocate(_loader_data,
5732 cp_size,
5733 CHECK);
5734
5735 ConstantPool* const cp = _cp;
5736
5737 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5738
5739 assert(cp_size == (const u2)cp->length(), "invariant");
5740
5741 // ACCESS FLAGS
5742 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5743
5744 // Access flags
5745 jint flags;
5746 // JVM_ACC_MODULE is defined in JDK-9 and later.
5747 if (_major_version >= JAVA_9_VERSION) {
5748 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5749 } else {
5750 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5751 }
5752
5753 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5754 // Set abstract bit for old class files for backward compatibility
5755 flags |= JVM_ACC_ABSTRACT;
5756 }
5757
5758 verify_legal_class_modifiers(flags, CHECK);
5759
5760 short bad_constant = class_bad_constant_seen();
5761 if (bad_constant != 0) {
5762 // Do not throw CFE until after the access_flags are checked because if
5763 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5764 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5765 return;
5766 }
5767
5768 _access_flags.set_flags(flags);
5769
5770 // This class and superclass
5771 _this_class_index = stream->get_u2_fast();
5838 if (stream->source() != NULL) {
5839 ls.print(" source: %s", stream->source());
5840 }
5841 ls.cr();
5842 }
5843 }
5844
5845 // SUPERKLASS
5846 _super_class_index = stream->get_u2_fast();
5847 _super_klass = parse_super_class(cp,
5848 _super_class_index,
5849 _need_verify,
5850 CHECK);
5851
5852 // Interfaces
5853 _itfs_len = stream->get_u2_fast();
5854 parse_interfaces(stream,
5855 _itfs_len,
5856 cp,
5857 &_has_nonstatic_concrete_methods,
5858 CHECK);
5859
5860 assert(_local_interfaces != NULL, "invariant");
5861
5862 // Fields (offsets are filled in later)
5863 _fac = new FieldAllocationCount();
5864 parse_fields(stream,
5865 _access_flags.is_interface(),
5866 _fac,
5867 cp,
5868 cp_size,
5869 &_java_fields_count,
5870 CHECK);
5871
5872 assert(_fields != NULL, "invariant");
5873
5874 // Methods
5875 AccessFlags promoted_flags;
5876 parse_methods(stream,
5877 _access_flags.is_interface(),
5878 &promoted_flags,
5879 &_has_final_method,
5880 &_declares_nonstatic_concrete_methods,
5881 CHECK);
5882
5883 assert(_methods != NULL, "invariant");
5884
5885 // promote flags from parse_methods() to the klass' flags
5886 _access_flags.add_promoted_flags(promoted_flags.as_int());
5887
5888 if (_declares_nonstatic_concrete_methods) {
5889 _has_nonstatic_concrete_methods = true;
5890 }
5891
5892 // Additional attributes/annotations
5893 _parsed_annotations = new ClassAnnotationCollector();
5894 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5895
5896 assert(_inner_classes != NULL, "invariant");
5897
5939
5940 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5941 // We have to update the resolved_klass_index and the name_index together
5942 // so extract the existing resolved_klass_index first.
5943 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5944 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5945 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5946 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5947 "Bad name_index");
5948 }
5949
5950 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5951 ConstantPool* cp,
5952 TRAPS) {
5953 assert(stream != NULL, "invariant");
5954 assert(stream->at_eos(), "invariant");
5955 assert(cp != NULL, "invariant");
5956 assert(_loader_data != NULL, "invariant");
5957
5958 if (_class_name == vmSymbols::java_lang_Object()) {
5959 check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5960 "java.lang.Object cannot implement an interface in class file %s",
5961 CHECK);
5962 }
5963 // We check super class after class file is parsed and format is checked
5964 if (_super_class_index > 0 && NULL == _super_klass) {
5965 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5966 if (_access_flags.is_interface()) {
5967 // Before attempting to resolve the superclass, check for class format
5968 // errors not checked yet.
5969 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5970 "Interfaces must have java.lang.Object as superclass in class file %s",
5971 CHECK);
5972 }
5973 Handle loader(THREAD, _loader_data->class_loader());
5974 _super_klass = (const InstanceKlass*)
5975 SystemDictionary::resolve_super_or_fail(_class_name,
5976 super_class_name,
5977 loader,
5978 _protection_domain,
5979 true,
5980 CHECK);
5981 }
5982
5983 if (_super_klass != NULL) {
5984 if (_super_klass->has_nonstatic_concrete_methods()) {
5985 _has_nonstatic_concrete_methods = true;
5986 }
5987
5988 if (_super_klass->is_interface()) {
5989 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5990 return;
5991 }
5992 }
5993
5994 // Compute the transitive list of all unique interfaces implemented by this class
5995 _transitive_interfaces =
5996 compute_transitive_interfaces(_super_klass,
5997 _local_interfaces,
5998 _loader_data,
5999 CHECK);
6000
6001 assert(_transitive_interfaces != NULL, "invariant");
6002
6003 // sort methods
6004 _method_ordering = sort_methods(_methods);
6005
6006 _all_mirandas = new GrowableArray<Method*>(20);
6007
6008 Handle loader(THREAD, _loader_data->class_loader());
6009 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6010 &_num_miranda_methods,
6011 _all_mirandas,
6012 _super_klass,
6013 _methods,
6014 _access_flags,
6015 _major_version,
6016 loader,
6017 _class_name,
6018 _local_interfaces);
6019
6020 // Size of Java itable (in words)
6021 _itable_size = _access_flags.is_interface() ? 0 :
6022 klassItable::compute_itable_size(_transitive_interfaces);
6023
6024 assert(_fac != NULL, "invariant");
6025 assert(_parsed_annotations != NULL, "invariant");
6026
6027 _field_info = new FieldLayoutInfo();
6028 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6029 _parsed_annotations->is_contended(), _field_info);
6030 lb.build_layout();
6031
6032 // Compute reference typ
6033 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6034
6035 }
6036
6037 void ClassFileParser::set_klass(InstanceKlass* klass) {
6038
6039 #ifdef ASSERT
6040 if (klass != NULL) {
6041 assert(NULL == _klass, "leaking?");
6042 }
6043 #endif
6044
6045 _klass = klass;
6046 }
6047
6048 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6049
6050 #ifdef ASSERT
6051 if (klass != NULL) {
6052 assert(NULL == _klass_to_deallocate, "leaking?");
6053 }
6054 #endif
6055
6056 _klass_to_deallocate = klass;
6057 }
6058
6059 // Caller responsible for ResourceMark
6060 // clone stream with rewound position
6061 const ClassFileStream* ClassFileParser::clone_stream() const {
6062 assert(_stream != NULL, "invariant");
6063
6064 return _stream->clone();
6065 }
6066 // ----------------------------------------------------------------------------
6067 // debugging
6068
6069 #ifdef ASSERT
6070
6071 // return true if class_name contains no '.' (internal format is '/')
6072 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6073 if (class_name != NULL) {
6074 ResourceMark rm;
6075 char* name = class_name->as_C_string();
6076 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6077 } else {
6078 return true;
6079 }
6080 }
6081
6082 #endif
|
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoadInfo.hpp"
32 #include "classfile/defaultMethods.hpp"
33 #include "classfile/fieldLayoutBuilder.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldStreams.inline.hpp"
53 #include "oops/inlineKlass.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/copy.hpp"
80 #include "utilities/formatBuffer.hpp"
81 #include "utilities/exceptions.hpp"
82 #include "utilities/globalDefinitions.hpp"
83 #include "utilities/growableArray.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/ostream.hpp"
86 #include "utilities/resourceHash.hpp"
87 #include "utilities/stringUtils.hpp"
88 #include "utilities/utf8.hpp"
89
90 #if INCLUDE_CDS
91 #include "classfile/systemDictionaryShared.hpp"
92 #endif
93 #if INCLUDE_JFR
94 #include "jfr/support/jfrTraceIdExtension.hpp"
95 #endif
96
97 // We generally try to create the oops directly when parsing, rather than
98 // allocating temporary data structures and copying the bytes twice. A
99 // temporary area is only needed when parsing utf8 entries in the constant
100 // pool and when parsing line number tables.
101
102 // We add assert in debug mode when class format is not checked.
103
104 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
105 #define JAVA_MIN_SUPPORTED_VERSION 45
106 #define JAVA_PREVIEW_MINOR_VERSION 65535
107
125 #define JAVA_9_VERSION 53
126
127 #define JAVA_10_VERSION 54
128
129 #define JAVA_11_VERSION 55
130
131 #define JAVA_12_VERSION 56
132
133 #define JAVA_13_VERSION 57
134
135 #define JAVA_14_VERSION 58
136
137 #define JAVA_15_VERSION 59
138
139 #define JAVA_16_VERSION 60
140
141 #define JAVA_17_VERSION 61
142
143 #define JAVA_18_VERSION 62
144
145 #define CONSTANT_CLASS_DESCRIPTORS 62
146
147
148 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
149 assert((bad_constant == JVM_CONSTANT_Module ||
150 bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
151 "Unexpected bad constant pool entry");
152 if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
153 }
154
155 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
156 ConstantPool* cp,
157 const int length,
158 TRAPS) {
159 assert(stream != NULL, "invariant");
160 assert(cp != NULL, "invariant");
161
162 // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
163 // this function (_current can be allocated in a register, with scalar
164 // replacement of aggregates). The _current pointer is copied back to
165 // stream() when this function returns. DON'T call another method within
166 // this method that uses stream().
167 const ClassFileStream cfs1 = *stream;
168 const ClassFileStream* const cfs = &cfs1;
169
170 assert(cfs->allocated_on_stack(), "should be local");
171 debug_only(const u1* const old_current = stream->current();)
172
173 // Used for batching symbol allocations.
174 const char* names[SymbolTable::symbol_alloc_batch_size];
175 int lengths[SymbolTable::symbol_alloc_batch_size];
176 int indices[SymbolTable::symbol_alloc_batch_size];
177 unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
178 int names_count = 0;
179
180 // parsing Index 0 is unused
181 for (int index = 1; index < length; index++) {
182 // Each of the following case guarantees one more byte in the stream
183 // for the following tag or the access_flags following constant pool,
184 // so we don't need bounds-check for reading tag.
185 const u1 tag = cfs->get_u1_fast();
186 switch (tag) {
187 case JVM_CONSTANT_Class: {
188 cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags
189 const u2 name_index = cfs->get_u2_fast();
190 cp->klass_index_at_put(index, name_index);
191 break;
192 }
193 case JVM_CONSTANT_Fieldref: {
194 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
195 const u2 class_index = cfs->get_u2_fast();
196 const u2 name_and_type_index = cfs->get_u2_fast();
197 cp->field_at_put(index, class_index, name_and_type_index);
198 break;
199 }
200 case JVM_CONSTANT_Methodref: {
201 cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags
202 const u2 class_index = cfs->get_u2_fast();
203 const u2 name_and_type_index = cfs->get_u2_fast();
204 cp->method_at_put(index, class_index, name_and_type_index);
205 break;
206 }
207 case JVM_CONSTANT_InterfaceMethodref: {
488 check_property(valid_symbol_at(name_ref_index),
489 "Invalid constant pool index %u in class file %s",
490 name_ref_index, CHECK);
491 check_property(valid_symbol_at(signature_ref_index),
492 "Invalid constant pool index %u in class file %s",
493 signature_ref_index, CHECK);
494 break;
495 }
496 case JVM_CONSTANT_Utf8:
497 break;
498 case JVM_CONSTANT_UnresolvedClass: // fall-through
499 case JVM_CONSTANT_UnresolvedClassInError: {
500 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
501 break;
502 }
503 case JVM_CONSTANT_ClassIndex: {
504 const int class_index = cp->klass_index_at(index);
505 check_property(valid_symbol_at(class_index),
506 "Invalid constant pool index %u in class file %s",
507 class_index, CHECK);
508
509 Symbol* const name = cp->symbol_at(class_index);
510 const unsigned int name_len = name->utf8_length();
511 if (name->is_Q_signature()) {
512 cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
513 } else {
514 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
515 }
516 break;
517 }
518 case JVM_CONSTANT_StringIndex: {
519 const int string_index = cp->string_index_at(index);
520 check_property(valid_symbol_at(string_index),
521 "Invalid constant pool index %u in class file %s",
522 string_index, CHECK);
523 Symbol* const sym = cp->symbol_at(string_index);
524 cp->unresolved_string_at_put(index, sym);
525 break;
526 }
527 case JVM_CONSTANT_MethodHandle: {
528 const int ref_index = cp->method_handle_index_at(index);
529 check_property(valid_cp_range(ref_index, length),
530 "Invalid constant pool index %u in class file %s",
531 ref_index, CHECK);
532 const constantTag tag = cp->tag_at(ref_index);
533 const int ref_kind = cp->method_handle_ref_kind_at(index);
534
535 switch (ref_kind) {
695 cp->signature_ref_index_at(name_and_type_ref_index);
696 const Symbol* const name = cp->symbol_at(name_ref_index);
697 const Symbol* const signature = cp->symbol_at(signature_ref_index);
698 if (tag == JVM_CONSTANT_Fieldref) {
699 if (_need_verify) {
700 // Field name and signature are verified above, when iterating NameAndType_info.
701 // Need only to be sure signature is non-zero length and the right type.
702 if (Signature::is_method(signature)) {
703 throwIllegalSignature("Field", name, signature, CHECK);
704 }
705 }
706 } else {
707 if (_need_verify) {
708 // Method name and signature are individually verified above, when iterating
709 // NameAndType_info. Need to check here that signature is non-zero length and
710 // the right type.
711 if (!Signature::is_method(signature)) {
712 throwIllegalSignature("Method", name, signature, CHECK);
713 }
714 }
715 // If a class method name begins with '<', it must be "<init>" and have void signature
716 // unless it's an inline type.
717 const unsigned int name_len = name->utf8_length();
718 if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
719 name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
720 if (name != vmSymbols::object_initializer_name()) {
721 classfile_parse_error(
722 "Bad method name at constant pool index %u in class file %s",
723 name_ref_index, THREAD);
724 return;
725 } else if (!Signature::is_void_method(signature)) {
726 // if return type is non-void then it cannot be a basic primitive
727 // and primitve types must be supported.
728 if (!signature->ends_with(JVM_SIGNATURE_ENDCLASS) || !EnableValhalla) {
729 throwIllegalSignature("Method", name, signature, CHECK);
730 }
731 }
732 }
733 }
734 break;
735 }
736 case JVM_CONSTANT_MethodHandle: {
737 const int ref_index = cp->method_handle_index_at(index);
738 const int ref_kind = cp->method_handle_ref_kind_at(index);
739 switch (ref_kind) {
740 case JVM_REF_invokeVirtual:
741 case JVM_REF_invokeStatic:
742 case JVM_REF_invokeSpecial:
743 case JVM_REF_newInvokeSpecial: {
744 const int name_and_type_ref_index =
745 cp->name_and_type_ref_index_at(ref_index);
746 const int name_ref_index =
747 cp->name_ref_index_at(name_and_type_ref_index);
748 const Symbol* const name = cp->symbol_at(name_ref_index);
749 if (name != vmSymbols::object_initializer_name()) {
750 if (ref_kind == JVM_REF_newInvokeSpecial) {
751 classfile_parse_error(
752 "Bad constructor name at constant pool index %u in class file %s",
753 name_ref_index, THREAD);
754 return;
755 }
756 } else {
757 // The allowed invocation mode of <init> depends on its signature.
758 // This test corresponds to verify_invoke_instructions in the verifier.
759 const int signature_ref_index =
760 cp->signature_ref_index_at(name_and_type_ref_index);
761 const Symbol* const signature = cp->symbol_at(signature_ref_index);
762 if (signature->is_void_method_signature()
763 && ref_kind == JVM_REF_newInvokeSpecial) {
764 // OK, could be a constructor call
765 } else if (!signature->is_void_method_signature()
766 && ref_kind == JVM_REF_invokeStatic) {
767 // also OK, could be a static factory call
768 } else {
769 classfile_parse_error(
770 "Bad method name at constant pool index %u in class file %s",
771 name_ref_index, THREAD);
772 return;
773 }
774 }
775 break;
776 }
777 // Other ref_kinds are already fully checked in previous pass.
778 } // switch(ref_kind)
779 break;
780 }
781 case JVM_CONSTANT_MethodType: {
782 const Symbol* const no_name = vmSymbols::type_name(); // place holder
783 const Symbol* const signature = cp->method_type_signature_at(index);
784 verify_legal_method_signature(no_name, signature, CHECK);
785 break;
786 }
787 case JVM_CONSTANT_Utf8: {
788 assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
826 while (entry != NULL) {
827 if (entry->_name == name && entry->_sig == sig) {
828 return false;
829 }
830 entry = entry->_next;
831 }
832
833 // No duplicate is found, allocate a new entry and fill it.
834 entry = new NameSigHash();
835 entry->_name = name;
836 entry->_sig = sig;
837
838 // Insert into hash table
839 entry->_next = table[index];
840 table[index] = entry;
841
842 return true;
843 }
844
845 // Side-effects: populates the _local_interfaces field
846 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
847 int itfs_len,
848 ConstantPool* cp,
849 bool* const has_nonstatic_concrete_methods,
850 // FIXME: lots of these functions
851 // declare their parameters as const,
852 // which adds only noise to the code.
853 // Remove the spurious const modifiers.
854 // Many are of the form "const int x"
855 // or "T* const x".
856 bool* const is_declared_atomic,
857 TRAPS) {
858 assert(stream != NULL, "invariant");
859 assert(cp != NULL, "invariant");
860 assert(has_nonstatic_concrete_methods != NULL, "invariant");
861
862 if (itfs_len == 0) {
863 _temp_local_interfaces = new GrowableArray<InstanceKlass*>(0);
864 } else {
865 assert(itfs_len > 0, "only called for len>0");
866 _temp_local_interfaces = new GrowableArray<InstanceKlass*>(itfs_len);
867 int index = 0;
868 for (index = 0; index < itfs_len; index++) {
869 const u2 interface_index = stream->get_u2(CHECK);
870 Klass* interf;
871 check_property(
872 valid_klass_reference_at(interface_index),
873 "Interface name has bad constant pool index %u in class file %s",
874 interface_index, CHECK);
875 if (cp->tag_at(interface_index).is_klass()) {
876 interf = cp->resolved_klass_at(interface_index);
877 } else {
878 Symbol* const unresolved_klass = cp->klass_name_at(interface_index);
879
880 // Don't need to check legal name because it's checked when parsing constant pool.
881 // But need to make sure it's not an array type.
882 guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
883 "Bad interface name in class file %s", CHECK);
884
885 // Call resolve_super so class circularity is checked
886 interf = SystemDictionary::resolve_super_or_fail(
887 _class_name,
888 unresolved_klass,
889 Handle(THREAD, _loader_data->class_loader()),
890 _protection_domain,
891 false,
892 CHECK);
893 }
894
895 if (!interf->is_interface()) {
896 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
897 err_msg("class %s can not implement %s, because it is not an interface (%s)",
898 _class_name->as_klass_external_name(),
899 interf->external_name(),
900 interf->class_in_module_of_loader()));
901 }
902
903 InstanceKlass* ik = InstanceKlass::cast(interf);
904 if (is_inline_type() && ik->invalid_inline_super()) {
905 ResourceMark rm(THREAD);
906 Exceptions::fthrow(
907 THREAD_AND_LOCATION,
908 vmSymbols::java_lang_IncompatibleClassChangeError(),
909 "Inline type %s attempts to implement interface java.lang.IdentityObject",
910 _class_name->as_klass_external_name());
911 return;
912 }
913 if (ik->invalid_inline_super()) {
914 set_invalid_inline_super();
915 }
916 if (ik->has_nonstatic_concrete_methods()) {
917 *has_nonstatic_concrete_methods = true;
918 }
919 if (ik->is_declared_atomic()) {
920 *is_declared_atomic = true;
921 }
922 if (ik->name() == vmSymbols::java_lang_IdentityObject()) {
923 _implements_identityObject = true;
924 }
925 if (ik->name() == vmSymbols::java_lang_PrimitiveObject()) {
926 // further checks for "is_invalid_super_for_inline_type()" needed later
927 // needs field parsing, delay unitl post_process_parse_stream()
928 _implements_primitiveObject = true;
929 }
930 _temp_local_interfaces->append(ik);
931 }
932
933 if (!_need_verify || itfs_len <= 1) {
934 return;
935 }
936
937 // Check if there's any duplicates in interfaces
938 ResourceMark rm(THREAD);
939 NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
940 NameSigHash*,
941 HASH_ROW_SIZE);
942 initialize_hashtable(interface_names);
943 bool dup = false;
944 const Symbol* name = NULL;
945 {
946 debug_only(NoSafepointVerifier nsv;)
947 for (index = 0; index < itfs_len; index++) {
948 const InstanceKlass* const k = _temp_local_interfaces->at(index);
949 name = k->name();
950 // If no duplicates, add (name, NULL) in hashtable interface_names.
951 if (!put_after_lookup(name, NULL, interface_names)) {
952 dup = true;
953 break;
954 }
955 }
956 }
957 if (dup) {
958 classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
959 name->as_C_string(), THREAD);
960 }
961 }
962 }
963
964 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
965 int constantvalue_index,
966 int signature_index,
967 TRAPS) const {
968 // Make sure the constant pool entry is of a type appropriate to this field
1413 CHECK);
1414 parsed_annotations->set_field_annotations(a);
1415 a = assemble_annotations(runtime_visible_type_annotations,
1416 runtime_visible_type_annotations_length,
1417 runtime_invisible_type_annotations,
1418 runtime_invisible_type_annotations_length,
1419 CHECK);
1420 parsed_annotations->set_field_type_annotations(a);
1421 return;
1422 }
1423
1424
1425 // Field allocation types. Used for computing field offsets.
1426
1427 enum FieldAllocationType {
1428 STATIC_OOP, // Oops
1429 STATIC_BYTE, // Boolean, Byte, char
1430 STATIC_SHORT, // shorts
1431 STATIC_WORD, // ints
1432 STATIC_DOUBLE, // aligned long or double
1433 STATIC_INLINE, // inline type field
1434 NONSTATIC_OOP,
1435 NONSTATIC_BYTE,
1436 NONSTATIC_SHORT,
1437 NONSTATIC_WORD,
1438 NONSTATIC_DOUBLE,
1439 NONSTATIC_INLINE,
1440 MAX_FIELD_ALLOCATION_TYPE,
1441 BAD_ALLOCATION_TYPE = -1
1442 };
1443
1444 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1445 BAD_ALLOCATION_TYPE, // 0
1446 BAD_ALLOCATION_TYPE, // 1
1447 BAD_ALLOCATION_TYPE, // 2
1448 BAD_ALLOCATION_TYPE, // 3
1449 NONSTATIC_BYTE , // T_BOOLEAN = 4,
1450 NONSTATIC_SHORT, // T_CHAR = 5,
1451 NONSTATIC_WORD, // T_FLOAT = 6,
1452 NONSTATIC_DOUBLE, // T_DOUBLE = 7,
1453 NONSTATIC_BYTE, // T_BYTE = 8,
1454 NONSTATIC_SHORT, // T_SHORT = 9,
1455 NONSTATIC_WORD, // T_INT = 10,
1456 NONSTATIC_DOUBLE, // T_LONG = 11,
1457 NONSTATIC_OOP, // T_OBJECT = 12,
1458 NONSTATIC_OOP, // T_ARRAY = 13,
1459 NONSTATIC_OOP, // T_INLINE_TYPE = 14,
1460 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1461 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1462 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1463 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1464 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1465 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20,
1466 BAD_ALLOCATION_TYPE, // 0
1467 BAD_ALLOCATION_TYPE, // 1
1468 BAD_ALLOCATION_TYPE, // 2
1469 BAD_ALLOCATION_TYPE, // 3
1470 STATIC_BYTE , // T_BOOLEAN = 4,
1471 STATIC_SHORT, // T_CHAR = 5,
1472 STATIC_WORD, // T_FLOAT = 6,
1473 STATIC_DOUBLE, // T_DOUBLE = 7,
1474 STATIC_BYTE, // T_BYTE = 8,
1475 STATIC_SHORT, // T_SHORT = 9,
1476 STATIC_WORD, // T_INT = 10,
1477 STATIC_DOUBLE, // T_LONG = 11,
1478 STATIC_OOP, // T_OBJECT = 12,
1479 STATIC_OOP, // T_ARRAY = 13,
1480 STATIC_OOP, // T_INLINE_TYPE = 14,
1481 BAD_ALLOCATION_TYPE, // T_VOID = 15,
1482 BAD_ALLOCATION_TYPE, // T_ADDRESS = 16,
1483 BAD_ALLOCATION_TYPE, // T_NARROWOOP = 17,
1484 BAD_ALLOCATION_TYPE, // T_METADATA = 18,
1485 BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1486 BAD_ALLOCATION_TYPE, // T_CONFLICT = 20
1487 };
1488
1489 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_inline_type) {
1490 assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1491 FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1492 assert(result != BAD_ALLOCATION_TYPE, "bad type");
1493 if (is_inline_type) {
1494 result = is_static ? STATIC_INLINE : NONSTATIC_INLINE;
1495 }
1496 return result;
1497 }
1498
1499 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1500 public:
1501 u2 count[MAX_FIELD_ALLOCATION_TYPE];
1502
1503 FieldAllocationCount() {
1504 for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1505 count[i] = 0;
1506 }
1507 }
1508
1509 void update(bool is_static, BasicType type, bool is_inline_type) {
1510 FieldAllocationType atype = basic_type_to_atype(is_static, type, is_inline_type);
1511 if (atype != BAD_ALLOCATION_TYPE) {
1512 // Make sure there is no overflow with injected fields.
1513 assert(count[atype] < 0xFFFF, "More than 65535 fields");
1514 count[atype]++;
1515 }
1516 }
1517 };
1518
1519 // Side-effects: populates the _fields, _fields_annotations,
1520 // _fields_type_annotations fields
1521 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1522 bool is_interface,
1523 bool is_inline_type,
1524 FieldAllocationCount* const fac,
1525 ConstantPool* cp,
1526 const int cp_size,
1527 u2* const java_fields_count_ptr,
1528 TRAPS) {
1529
1530 assert(cfs != NULL, "invariant");
1531 assert(fac != NULL, "invariant");
1532 assert(cp != NULL, "invariant");
1533 assert(java_fields_count_ptr != NULL, "invariant");
1534
1535 assert(NULL == _fields, "invariant");
1536 assert(NULL == _fields_annotations, "invariant");
1537 assert(NULL == _fields_type_annotations, "invariant");
1538
1539 cfs->guarantee_more(2, CHECK); // length
1540 const u2 length = cfs->get_u2_fast();
1541 *java_fields_count_ptr = length;
1542
1543 int num_injected = 0;
1544 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1545 &num_injected);
1546
1547 // two more slots are required for inline classes:
1548 // one for the static field with a reference to the pre-allocated default value
1549 // one for the field the JVM injects when detecting an empty inline class
1550 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1551
1552 // The field array starts with tuples of shorts
1553 // [access, name index, sig index, initial value index, byte offset].
1554 // A generic signature slot only exists for field with generic
1555 // signature attribute. And the access flag is set with
1556 // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1557 // signature slots are at the end of the field array and after all
1558 // other fields data.
1559 //
1560 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1561 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1562 // ...
1563 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1564 // [generic signature index]
1565 // [generic signature index]
1566 // ...
1567 //
1568 // Allocate a temporary resource array for field data. For each field,
1569 // a slot is reserved in the temporary array for the generic signature
1570 // index. After parsing all fields, the data are copied to a permanent
1571 // array and any unused slots will be discarded.
1572 ResourceMark rm(THREAD);
1573 u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1574 u2,
1575 total_fields * (FieldInfo::field_slots + 1));
1576
1577 // The generic signature slots start after all other fields' data.
1578 int generic_signature_slot = total_fields * FieldInfo::field_slots;
1579 int num_generic_signature = 0;
1580 int instance_fields_count = 0;
1581 for (int n = 0; n < length; n++) {
1582 // access_flags, name_index, descriptor_index, attributes_count
1583 cfs->guarantee_more(8, CHECK);
1584
1585 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1586
1587 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1588 verify_legal_field_modifiers(flags, is_interface, is_inline_type, CHECK);
1589 AccessFlags access_flags;
1590 access_flags.set_flags(flags);
1591
1592 const u2 name_index = cfs->get_u2_fast();
1593 check_property(valid_symbol_at(name_index),
1594 "Invalid constant pool index %u for field name in class file %s",
1595 name_index, CHECK);
1596 const Symbol* const name = cp->symbol_at(name_index);
1597 verify_legal_field_name(name, CHECK);
1598
1599 const u2 signature_index = cfs->get_u2_fast();
1600 check_property(valid_symbol_at(signature_index),
1601 "Invalid constant pool index %u for field signature in class file %s",
1602 signature_index, CHECK);
1603 const Symbol* const sig = cp->symbol_at(signature_index);
1604 verify_legal_field_signature(name, sig, CHECK);
1605 if (!access_flags.is_static()) instance_fields_count++;
1606
1607 u2 constantvalue_index = 0;
1608 bool is_synthetic = false;
1609 u2 generic_signature_index = 0;
1610 const bool is_static = access_flags.is_static();
1611 FieldAnnotationCollector parsed_annotations(_loader_data);
1612
1613 const u2 attributes_count = cfs->get_u2_fast();
1614 if (attributes_count > 0) {
1615 parse_field_attributes(cfs,
1616 attributes_count,
1617 is_static,
1618 signature_index,
1619 &constantvalue_index,
1620 &is_synthetic,
1621 &generic_signature_index,
1622 &parsed_annotations,
1623 CHECK);
1624
1625 if (parsed_annotations.field_annotations() != NULL) {
1645
1646 if (is_synthetic) {
1647 access_flags.set_is_synthetic();
1648 }
1649 if (generic_signature_index != 0) {
1650 access_flags.set_field_has_generic_signature();
1651 fa[generic_signature_slot] = generic_signature_index;
1652 generic_signature_slot ++;
1653 num_generic_signature ++;
1654 }
1655 }
1656
1657 FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1658 field->initialize(access_flags.as_short(),
1659 name_index,
1660 signature_index,
1661 constantvalue_index);
1662 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1663
1664 // Update FieldAllocationCount for this kind of field
1665 fac->update(is_static, type, type == T_INLINE_TYPE);
1666
1667 // After field is initialized with type, we can augment it with aux info
1668 if (parsed_annotations.has_any_annotations()) {
1669 parsed_annotations.apply_to(field);
1670 if (field->is_contended()) {
1671 _has_contended_fields = true;
1672 }
1673 }
1674 }
1675
1676 int index = length;
1677 if (num_injected != 0) {
1678 for (int n = 0; n < num_injected; n++) {
1679 // Check for duplicates
1680 if (injected[n].may_be_java) {
1681 const Symbol* const name = injected[n].name();
1682 const Symbol* const signature = injected[n].signature();
1683 bool duplicate = false;
1684 for (int i = 0; i < length; i++) {
1685 const FieldInfo* const f = FieldInfo::from_field_array(fa, i);
1689 duplicate = true;
1690 break;
1691 }
1692 }
1693 if (duplicate) {
1694 // These will be removed from the field array at the end
1695 continue;
1696 }
1697 }
1698
1699 // Injected field
1700 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1701 field->initialize((u2)JVM_ACC_FIELD_INTERNAL,
1702 (u2)(injected[n].name_index),
1703 (u2)(injected[n].signature_index),
1704 0);
1705
1706 const BasicType type = Signature::basic_type(injected[n].signature());
1707
1708 // Update FieldAllocationCount for this kind of field
1709 fac->update(false, type, false);
1710 index++;
1711 }
1712 }
1713
1714 if (is_inline_type) {
1715 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1716 field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1717 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1718 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1719 0);
1720 const BasicType type = Signature::basic_type(vmSymbols::object_signature());
1721 fac->update(true, type, false);
1722 index++;
1723 }
1724
1725 if (is_inline_type && instance_fields_count == 0) {
1726 _is_empty_inline_type = true;
1727 FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1728 field->initialize(JVM_ACC_FIELD_INTERNAL,
1729 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(empty_marker_name)),
1730 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(byte_signature)),
1731 0);
1732 const BasicType type = Signature::basic_type(vmSymbols::byte_signature());
1733 fac->update(false, type, false);
1734 index++;
1735 }
1736
1737 if (instance_fields_count > 0) {
1738 _has_nonstatic_fields = true;
1739 }
1740
1741 assert(NULL == _fields, "invariant");
1742
1743 _fields =
1744 MetadataFactory::new_array<u2>(_loader_data,
1745 index * FieldInfo::field_slots + num_generic_signature,
1746 CHECK);
1747 // Sometimes injected fields already exist in the Java source so
1748 // the fields array could be too long. In that case the
1749 // fields array is trimed. Also unused slots that were reserved
1750 // for generic signature indexes are discarded.
1751 {
1752 int i = 0;
1753 for (; i < index * FieldInfo::field_slots; i++) {
1754 _fields->at_put(i, fa[i]);
1755 }
1756 for (int j = total_fields * FieldInfo::field_slots;
1757 j < generic_signature_slot; j++) {
1758 _fields->at_put(i++, fa[j]);
1759 }
1760 assert(_fields->length() == i, "");
2038 "Exception name has bad type at constant pool %u in class file %s",
2039 checked_exception, CHECK_NULL);
2040 }
2041 }
2042 // check exceptions attribute length
2043 if (_need_verify) {
2044 guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2045 sizeof(u2) * size),
2046 "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2047 }
2048 return checked_exceptions_start;
2049 }
2050
2051 void ClassFileParser::throwIllegalSignature(const char* type,
2052 const Symbol* name,
2053 const Symbol* sig,
2054 TRAPS) const {
2055 assert(name != NULL, "invariant");
2056 assert(sig != NULL, "invariant");
2057
2058 const char* class_note = "";
2059 if (is_inline_type() && name == vmSymbols::object_initializer_name()) {
2060 class_note = " (an inline class)";
2061 }
2062
2063 ResourceMark rm(THREAD);
2064 Exceptions::fthrow(THREAD_AND_LOCATION,
2065 vmSymbols::java_lang_ClassFormatError(),
2066 "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2067 name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2068 }
2069
2070 AnnotationCollector::ID
2071 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2072 const Symbol* name,
2073 const bool can_access_vm_annotations) {
2074 const vmSymbolID sid = vmSymbols::find_sid(name);
2075 // Privileged code can use all annotations. Other code silently drops some.
2076 const bool privileged = loader_data->is_boot_class_loader_data() ||
2077 loader_data->is_platform_class_loader_data() ||
2078 can_access_vm_annotations;
2079 switch (sid) {
2080 case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2081 if (_location != _in_method) break; // only allow for methods
2082 if (!privileged) break; // only allow in privileged code
2083 return _method_CallerSensitive;
2084 }
2085 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2086 if (_location != _in_method) break; // only allow for methods
2087 if (!privileged) break; // only allow in privileged code
2336 runtime_visible_type_annotations_length,
2337 runtime_invisible_type_annotations,
2338 runtime_invisible_type_annotations_length,
2339 CHECK);
2340 cm->set_type_annotations(a);
2341 }
2342 }
2343
2344
2345 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2346 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2347 // Method* to save footprint, so we only know the size of the resulting Method* when the
2348 // entire method attribute is parsed.
2349 //
2350 // The promoted_flags parameter is used to pass relevant access_flags
2351 // from the method back up to the containing klass. These flag values
2352 // are added to klass's access_flags.
2353
2354 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2355 bool is_interface,
2356 bool is_inline_type,
2357 const ConstantPool* cp,
2358 AccessFlags* const promoted_flags,
2359 TRAPS) {
2360 assert(cfs != NULL, "invariant");
2361 assert(cp != NULL, "invariant");
2362 assert(promoted_flags != NULL, "invariant");
2363
2364 ResourceMark rm(THREAD);
2365 // Parse fixed parts:
2366 // access_flags, name_index, descriptor_index, attributes_count
2367 cfs->guarantee_more(8, CHECK_NULL);
2368
2369 int flags = cfs->get_u2_fast();
2370 const u2 name_index = cfs->get_u2_fast();
2371 const int cp_size = cp->length();
2372 check_property(
2373 valid_symbol_at(name_index),
2374 "Illegal constant pool index %u for method name in class file %s",
2375 name_index, CHECK_NULL);
2376 const Symbol* const name = cp->symbol_at(name_index);
2378
2379 const u2 signature_index = cfs->get_u2_fast();
2380 guarantee_property(
2381 valid_symbol_at(signature_index),
2382 "Illegal constant pool index %u for method signature in class file %s",
2383 signature_index, CHECK_NULL);
2384 const Symbol* const signature = cp->symbol_at(signature_index);
2385
2386 if (name == vmSymbols::class_initializer_name()) {
2387 // We ignore the other access flags for a valid class initializer.
2388 // (JVM Spec 2nd ed., chapter 4.6)
2389 if (_major_version < 51) { // backward compatibility
2390 flags = JVM_ACC_STATIC;
2391 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2392 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2393 } else {
2394 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2395 return NULL;
2396 }
2397 } else {
2398 verify_legal_method_modifiers(flags, is_interface, is_inline_type, name, CHECK_NULL);
2399 }
2400
2401 if (name == vmSymbols::object_initializer_name()) {
2402 if (is_interface) {
2403 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2404 return NULL;
2405 } else if (!is_inline_type && signature->is_void_method_signature()) {
2406 // OK, a constructor
2407 } else if (is_inline_type && !signature->is_void_method_signature()) {
2408 // also OK, a static factory, as long as the return value is good
2409 bool ok = false;
2410 SignatureStream ss((Symbol*) signature, true);
2411 while (!ss.at_return_type()) ss.next();
2412 if (ss.is_reference()) {
2413 Symbol* ret = ss.as_symbol();
2414 const Symbol* required = class_name();
2415 if (is_hidden()) {
2416 // The original class name in hidden classes gets changed. So using
2417 // the original name in the return type is no longer valid.
2418 // Note that expecting the return type for inline hidden class factory
2419 // methods to be java.lang.Object works around a JVM Spec issue for
2420 // hidden classes.
2421 required = vmSymbols::java_lang_Object();
2422 }
2423 ok = (ret == required);
2424 }
2425 if (!ok) {
2426 throwIllegalSignature("Method", name, signature, CHECK_0);
2427 }
2428 } else {
2429 // not OK, so throw the same error as in verify_legal_method_signature.
2430 throwIllegalSignature("Method", name, signature, CHECK_0);
2431 }
2432 // A declared <init> method must always be either a non-static
2433 // object constructor, with a void return, or else it must be a
2434 // static factory method, with a non-void return. No other
2435 // definition of <init> is possible.
2436 //
2437 // The verifier (in verify_invoke_instructions) will inspect the
2438 // signature of any attempt to invoke <init>, and ensures that it
2439 // returns non-void if and only if it is being invoked by
2440 // invokestatic, and void if and only if it is being invoked by
2441 // invokespecial.
2442 //
2443 // When a symbolic reference to <init> is resolved for a
2444 // particular invocation mode (special or static), the mode is
2445 // matched to the JVM_ACC_STATIC modifier of the <init> method.
2446 // Thus, it is impossible to statically invoke a constructor, and
2447 // impossible to "new + invokespecial" a static factory, either
2448 // through bytecode or through reflection.
2449 }
2450
2451 int args_size = -1; // only used when _need_verify is true
2452 if (_need_verify) {
2453 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2454 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2455 verify_legal_method_signature(name, signature, CHECK_NULL);
2456 if (args_size > MAX_ARGS_SIZE) {
2457 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2458 return NULL;
2459 }
2460 }
2461
2462 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2463
2464 // Default values for code and exceptions attribute elements
2465 u2 max_stack = 0;
2466 u2 max_locals = 0;
2467 u4 code_length = 0;
2468 const u1* code_start = 0;
2996 _has_finalizer = true;
2997 }
2998 }
2999 if (name == vmSymbols::object_initializer_name() &&
3000 signature == vmSymbols::void_method_signature() &&
3001 m->is_vanilla_constructor()) {
3002 _has_vanilla_constructor = true;
3003 }
3004
3005 NOT_PRODUCT(m->verify());
3006 return m;
3007 }
3008
3009
3010 // The promoted_flags parameter is used to pass relevant access_flags
3011 // from the methods back up to the containing klass. These flag values
3012 // are added to klass's access_flags.
3013 // Side-effects: populates the _methods field in the parser
3014 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3015 bool is_interface,
3016 bool is_inline_type,
3017 AccessFlags* promoted_flags,
3018 bool* has_final_method,
3019 bool* declares_nonstatic_concrete_methods,
3020 TRAPS) {
3021 assert(cfs != NULL, "invariant");
3022 assert(promoted_flags != NULL, "invariant");
3023 assert(has_final_method != NULL, "invariant");
3024 assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3025
3026 assert(NULL == _methods, "invariant");
3027
3028 cfs->guarantee_more(2, CHECK); // length
3029 const u2 length = cfs->get_u2_fast();
3030 if (length == 0) {
3031 _methods = Universe::the_empty_method_array();
3032 } else {
3033 _methods = MetadataFactory::new_array<Method*>(_loader_data,
3034 length,
3035 NULL,
3036 CHECK);
3037
3038 for (int index = 0; index < length; index++) {
3039 Method* method = parse_method(cfs,
3040 is_interface,
3041 is_inline_type,
3042 _cp,
3043 promoted_flags,
3044 CHECK);
3045
3046 if (method->is_final()) {
3047 *has_final_method = true;
3048 }
3049 // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3050 // used for interface initialization, and default method inheritance analysis
3051 if (is_interface && !(*declares_nonstatic_concrete_methods)
3052 && !method->is_abstract() && !method->is_static()) {
3053 *declares_nonstatic_concrete_methods = true;
3054 }
3055 _methods->at_put(index, method);
3056 }
3057
3058 if (_need_verify && length > 1) {
3059 // Check duplicated methods
3060 ResourceMark rm(THREAD);
3061 NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(
3289 valid_klass_reference_at(inner_class_info_index),
3290 "inner_class_info_index %u has bad constant type in class file %s",
3291 inner_class_info_index, CHECK_0);
3292 // Outer class index
3293 const u2 outer_class_info_index = cfs->get_u2_fast();
3294 check_property(
3295 outer_class_info_index == 0 ||
3296 valid_klass_reference_at(outer_class_info_index),
3297 "outer_class_info_index %u has bad constant type in class file %s",
3298 outer_class_info_index, CHECK_0);
3299 // Inner class name
3300 const u2 inner_name_index = cfs->get_u2_fast();
3301 check_property(
3302 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3303 "inner_name_index %u has bad constant type in class file %s",
3304 inner_name_index, CHECK_0);
3305 if (_need_verify) {
3306 guarantee_property(inner_class_info_index != outer_class_info_index,
3307 "Class is both outer and inner class in class file %s", CHECK_0);
3308 }
3309
3310 jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3311 // JVM_ACC_MODULE is defined in JDK-9 and later.
3312 if (_major_version >= JAVA_9_VERSION) {
3313 recognized_modifiers |= JVM_ACC_MODULE;
3314 }
3315 // JVM_ACC_INLINE is defined for class file version 55 and later
3316 if (supports_inline_types()) {
3317 recognized_modifiers |= JVM_ACC_INLINE;
3318 }
3319
3320 // Access flags
3321 jint flags = cfs->get_u2_fast() & recognized_modifiers;
3322
3323 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3324 // Set abstract bit for old class files for backward compatibility
3325 flags |= JVM_ACC_ABSTRACT;
3326 }
3327 verify_legal_class_modifiers(flags, CHECK_0);
3328 AccessFlags inner_access_flags(flags);
3329
3330 inner_classes->at_put(index++, inner_class_info_index);
3331 inner_classes->at_put(index++, outer_class_info_index);
3332 inner_classes->at_put(index++, inner_name_index);
3333 inner_classes->at_put(index++, inner_access_flags.as_short());
3334 }
3335
3336 // 4347400: make sure there's no duplicate entry in the classes array
3337 // Also, check for circular entries.
3338 bool has_circularity = false;
3339 if (_need_verify && _major_version >= JAVA_1_5_VERSION) {
3340 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3341 if (has_circularity) {
3342 // If circularity check failed then ignore InnerClasses attribute.
4148 }
4149 if (runtime_invisible_annotations != NULL) {
4150 for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4151 int append = runtime_visible_annotations_length+i;
4152 annotations->at_put(append, runtime_invisible_annotations[i]);
4153 }
4154 }
4155 }
4156 return annotations;
4157 }
4158
4159 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4160 const int super_class_index,
4161 const bool need_verify,
4162 TRAPS) {
4163 assert(cp != NULL, "invariant");
4164 const InstanceKlass* super_klass = NULL;
4165
4166 if (super_class_index == 0) {
4167 check_property(_class_name == vmSymbols::java_lang_Object(),
4168 "Invalid superclass index 0 in class file %s",
4169 CHECK_NULL);
4170 } else {
4171 check_property(valid_klass_reference_at(super_class_index),
4172 "Invalid superclass index %u in class file %s",
4173 super_class_index,
4174 CHECK_NULL);
4175 // The class name should be legal because it is checked when parsing constant pool.
4176 // However, make sure it is not an array type.
4177 bool is_array = false;
4178 if (cp->tag_at(super_class_index).is_klass()) {
4179 super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4180 if (need_verify)
4181 is_array = super_klass->is_array_klass();
4182 } else if (need_verify) {
4183 is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4184 }
4185 if (need_verify) {
4186 guarantee_property(!is_array,
4187 "Bad superclass name in class file %s", CHECK_NULL);
4188 }
4289 }
4290
4291 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4292 st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4293 if (_nonstatic_oop_map_count > 0) {
4294 OopMapBlock* map = _nonstatic_oop_maps;
4295 OopMapBlock* last_map = last_oop_map();
4296 assert(map <= last_map, "Last less than first");
4297 while (map <= last_map) {
4298 st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(),
4299 map->offset() + map->offset_span() - heapOopSize, map->count());
4300 map++;
4301 }
4302 }
4303 }
4304
4305 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4306 print_on(st);
4307 }
4308
4309 void ClassFileParser::throwInlineTypeLimitation(THREAD_AND_LOCATION_DECL,
4310 const char* msg,
4311 const Symbol* name,
4312 const Symbol* sig) const {
4313
4314 ResourceMark rm(THREAD);
4315 if (name == NULL || sig == NULL) {
4316 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4317 vmSymbols::java_lang_ClassFormatError(),
4318 "class: %s - %s", _class_name->as_C_string(), msg);
4319 }
4320 else {
4321 Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4322 vmSymbols::java_lang_ClassFormatError(),
4323 "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4324 _class_name->as_C_string(), msg);
4325 }
4326 }
4327
4328 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4329 assert(ik != NULL, "invariant");
4330
4331 const Klass* const super = ik->super();
4332
4333 // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4334 // in which case we don't have to register objects as finalizable
4335 if (!_has_empty_finalizer) {
4336 if (_has_finalizer ||
4337 (super != NULL && super->has_finalizer())) {
4338 ik->set_has_finalizer();
4339 }
4340 }
4341
4342 #ifdef ASSERT
4343 bool f = false;
4344 const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4345 vmSymbols::void_method_signature());
4346 if (m != NULL && !m->is_empty_method()) {
4347 f = true;
4348 }
4349
4350 // Spec doesn't prevent agent from redefinition of empty finalizer.
4351 // Despite the fact that it's generally bad idea and redefined finalizer
4352 // will not work as expected we shouldn't abort vm in this case
4353 if (!ik->has_redefined_this_or_super()) {
4354 assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4355 }
4356 #endif
4357
4358 // Check if this klass supports the java.lang.Cloneable interface
4359 if (vmClasses::Cloneable_klass_loaded()) {
4360 if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4361 if (ik->is_inline_klass()) {
4362 JavaThread *THREAD = JavaThread::current();
4363 throwInlineTypeLimitation(THREAD_AND_LOCATION, "Inline Types do not support Cloneable");
4364 return;
4365 }
4366 ik->set_is_cloneable();
4367 }
4368 }
4369
4370 // Check if this klass has a vanilla default constructor
4371 if (super == NULL) {
4372 // java.lang.Object has empty default constructor
4373 ik->set_has_vanilla_constructor();
4374 } else {
4375 if (super->has_vanilla_constructor() &&
4376 _has_vanilla_constructor) {
4377 ik->set_has_vanilla_constructor();
4378 }
4379 #ifdef ASSERT
4380 bool v = false;
4381 if (super->has_vanilla_constructor()) {
4382 const Method* const constructor =
4383 ik->find_method(vmSymbols::object_initializer_name(),
4384 vmSymbols::void_method_signature());
4385 if (constructor != NULL && constructor->is_vanilla_constructor()) {
4386 v = true;
4387 }
4388 }
4389 assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4390 #endif
4391 }
4392
4393 // If it cannot be fast-path allocated, set a bit in the layout helper.
4394 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4395 assert(ik->size_helper() > 0, "layout_helper is initialized");
4396 if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4397 || ik->is_abstract() || ik->is_interface()
4398 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4399 || ik->size_helper() >= FastAllocateSizeLimit) {
4400 // Forbid fast-path allocation.
4401 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4402 ik->set_layout_helper(lh);
4403 }
4404 }
4405
4406 bool ClassFileParser::supports_inline_types() const {
4407 // Inline types are only supported by class file version 55 and later
4408 return _major_version >= JAVA_11_VERSION;
4409 }
4410
4411 // utility methods for appending an array with check for duplicates
4412
4413 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4414 const Array<InstanceKlass*>* const ifs) {
4415 // iterate over new interfaces
4416 for (int i = 0; i < ifs->length(); i++) {
4417 InstanceKlass* const e = ifs->at(i);
4418 assert(e->is_klass() && e->is_interface(), "just checking");
4419 // add new interface
4420 result->append_if_missing(e);
4421 }
4422 }
4423
4424 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4425 Array<InstanceKlass*>* local_ifs,
4426 ClassLoaderData* loader_data,
4427 TRAPS) {
4428 assert(local_ifs != NULL, "invariant");
4429 assert(loader_data != NULL, "invariant");
4430
4434 // Add superclass transitive interfaces size
4435 if (super != NULL) {
4436 super_size = super->transitive_interfaces()->length();
4437 max_transitive_size += super_size;
4438 }
4439 // Add local interfaces' super interfaces
4440 const int local_size = local_ifs->length();
4441 for (int i = 0; i < local_size; i++) {
4442 InstanceKlass* const l = local_ifs->at(i);
4443 max_transitive_size += l->transitive_interfaces()->length();
4444 }
4445 // Finally add local interfaces
4446 max_transitive_size += local_size;
4447 // Construct array
4448 if (max_transitive_size == 0) {
4449 // no interfaces, use canonicalized array
4450 return Universe::the_empty_instance_klass_array();
4451 } else if (max_transitive_size == super_size) {
4452 // no new local interfaces added, share superklass' transitive interface array
4453 return super->transitive_interfaces();
4454 // The three lines below are commented to work around bug JDK-8245487
4455 // } else if (max_transitive_size == local_size) {
4456 // // only local interfaces added, share local interface array
4457 // return local_ifs;
4458 } else {
4459 ResourceMark rm;
4460 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4461
4462 // Copy down from superclass
4463 if (super != NULL) {
4464 append_interfaces(result, super->transitive_interfaces());
4465 }
4466
4467 // Copy down from local interfaces' superinterfaces
4468 for (int i = 0; i < local_size; i++) {
4469 InstanceKlass* const l = local_ifs->at(i);
4470 append_interfaces(result, l->transitive_interfaces());
4471 }
4472 // Finally add local interfaces
4473 append_interfaces(result, local_ifs);
4474
4475 // length will be less than the max_transitive_size if duplicates were removed
4476 const int length = result->length();
4477 assert(length <= max_transitive_size, "just checking");
4478
4479 if (length == 1 && result->at(0) == vmClasses::IdentityObject_klass()) {
4480 return Universe::the_single_IdentityObject_klass_array();
4481 }
4482 if (length == 1 && result->at(0) == vmClasses::PrimitiveObject_klass()) {
4483 return Universe::the_single_PrimitiveObject_klass_array();
4484 }
4485
4486 Array<InstanceKlass*>* const new_result =
4487 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4488 for (int i = 0; i < length; i++) {
4489 InstanceKlass* const e = result->at(i);
4490 assert(e != NULL, "just checking");
4491 new_result->at_put(i, e);
4492 }
4493 return new_result;
4494 }
4495 }
4496
4497 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4498 assert(this_klass != NULL, "invariant");
4499 const Klass* const super = this_klass->super();
4500
4501 if (super != NULL) {
4502 const InstanceKlass* super_ik = InstanceKlass::cast(super);
4503
4504 if (super->is_final()) {
4505 classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4679 const Method* const m = methods->at(index);
4680 // if m is static and not the init method, throw a verify error
4681 if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4682 ResourceMark rm(THREAD);
4683 Exceptions::fthrow(
4684 THREAD_AND_LOCATION,
4685 vmSymbols::java_lang_VerifyError(),
4686 "Illegal static method %s in interface %s",
4687 m->name()->as_C_string(),
4688 this_klass->external_name()
4689 );
4690 return;
4691 }
4692 }
4693 }
4694
4695 // utility methods for format checking
4696
4697 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4698 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4699 const bool is_inline_type = (flags & JVM_ACC_INLINE) != 0;
4700 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4701 assert(supports_inline_types() || !is_inline_type, "JVM_ACC_INLINE should not be set");
4702 if (is_module) {
4703 ResourceMark rm(THREAD);
4704 Exceptions::fthrow(
4705 THREAD_AND_LOCATION,
4706 vmSymbols::java_lang_NoClassDefFoundError(),
4707 "%s is not a class because access_flag ACC_MODULE is set",
4708 _class_name->as_C_string());
4709 return;
4710 }
4711
4712 if (is_inline_type && !EnableValhalla) {
4713 ResourceMark rm(THREAD);
4714 Exceptions::fthrow(
4715 THREAD_AND_LOCATION,
4716 vmSymbols::java_lang_ClassFormatError(),
4717 "Class modifier ACC_INLINE in class %s requires option -XX:+EnableValhalla",
4718 _class_name->as_C_string()
4719 );
4720 return;
4721 }
4722
4723 if (!_need_verify) { return; }
4724
4725 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4726 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4727 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4728 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4729 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4730 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4731 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4732 const bool major_gte_14 = _major_version >= JAVA_14_VERSION;
4733
4734 if ((is_abstract && is_final) ||
4735 (is_interface && !is_abstract) ||
4736 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4737 (!is_interface && major_gte_1_5 && is_annotation) ||
4738 (is_inline_type && (is_interface || is_abstract || is_enum || !is_final))) {
4739 ResourceMark rm(THREAD);
4740 const char* class_note = "";
4741 if (is_inline_type) class_note = " (an inline class)";
4742 Exceptions::fthrow(
4743 THREAD_AND_LOCATION,
4744 vmSymbols::java_lang_ClassFormatError(),
4745 "Illegal class modifiers in class %s%s: 0x%X",
4746 _class_name->as_C_string(), class_note, flags
4747 );
4748 return;
4749 }
4750 }
4751
4752 static bool has_illegal_visibility(jint flags) {
4753 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4754 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4755 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4756
4757 return ((is_public && is_protected) ||
4758 (is_public && is_private) ||
4759 (is_protected && is_private));
4760 }
4761
4762 // A legal major_version.minor_version must be one of the following:
4763 //
4764 // Major_version >= 45 and major_version < 56, any minor_version.
4765 // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4766 // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4796 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4797 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4798 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4799 return;
4800 }
4801
4802 if (!Arguments::enable_preview()) {
4803 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4804 class_name, major, minor, THREAD);
4805 return;
4806 }
4807
4808 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4809 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4810 class_name, major, minor, THREAD);
4811 }
4812 }
4813
4814 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4815 bool is_interface,
4816 bool is_inline_type,
4817 TRAPS) const {
4818 if (!_need_verify) { return; }
4819
4820 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4821 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4822 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4823 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4824 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4825 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4826 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4827 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4828 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4829
4830 bool is_illegal = false;
4831
4832 if (is_interface) {
4833 if (!is_public || !is_static || !is_final || is_private ||
4834 is_protected || is_volatile || is_transient ||
4835 (major_gte_1_5 && is_enum)) {
4836 is_illegal = true;
4837 }
4838 } else { // not interface
4839 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4840 is_illegal = true;
4841 } else {
4842 if (is_inline_type && !is_static && !is_final) {
4843 is_illegal = true;
4844 }
4845 }
4846 }
4847
4848 if (is_illegal) {
4849 ResourceMark rm(THREAD);
4850 Exceptions::fthrow(
4851 THREAD_AND_LOCATION,
4852 vmSymbols::java_lang_ClassFormatError(),
4853 "Illegal field modifiers in class %s: 0x%X",
4854 _class_name->as_C_string(), flags);
4855 return;
4856 }
4857 }
4858
4859 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4860 bool is_interface,
4861 bool is_inline_type,
4862 const Symbol* name,
4863 TRAPS) const {
4864 if (!_need_verify) { return; }
4865
4866 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4867 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4868 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4869 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4870 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4871 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4872 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4873 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4874 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4875 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4876 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4877 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4878 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4879 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4880
4881 bool is_illegal = false;
4882
4883 const char* class_note = "";
4884 if (is_interface) {
4885 if (major_gte_8) {
4886 // Class file version is JAVA_8_VERSION or later Methods of
4887 // interfaces may set any of the flags except ACC_PROTECTED,
4888 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4889 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4890 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4891 (is_native || is_protected || is_final || is_synchronized) ||
4892 // If a specific method of a class or interface has its
4893 // ACC_ABSTRACT flag set, it must not have any of its
4894 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4895 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4896 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4897 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4898 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4899 is_illegal = true;
4900 }
4901 } else if (major_gte_1_5) {
4902 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4903 if (!is_public || is_private || is_protected || is_static || is_final ||
4904 is_synchronized || is_native || !is_abstract || is_strict) {
4905 is_illegal = true;
4906 }
4907 } else {
4908 // Class file version is pre-JAVA_1_5_VERSION
4909 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4910 is_illegal = true;
4911 }
4912 }
4913 } else { // not interface
4914 if (has_illegal_visibility(flags)) {
4915 is_illegal = true;
4916 } else {
4917 if (is_initializer) {
4918 if (is_final || is_synchronized || is_native ||
4919 is_abstract || (major_gte_1_5 && is_bridge)) {
4920 is_illegal = true;
4921 }
4922 if (!is_static && !is_inline_type) {
4923 // OK, an object constructor in a regular class
4924 } else if (is_static && is_inline_type) {
4925 // OK, a static init factory in an inline class
4926 } else {
4927 // but no other combinations are allowed
4928 is_illegal = true;
4929 class_note = (is_inline_type ? " (an inline class)" : " (not an inline class)");
4930 }
4931 } else { // not initializer
4932 if (is_inline_type && is_synchronized && !is_static) {
4933 is_illegal = true;
4934 class_note = " (an inline class)";
4935 } else {
4936 if (is_abstract) {
4937 if ((is_final || is_native || is_private || is_static ||
4938 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4939 is_illegal = true;
4940 }
4941 }
4942 }
4943 }
4944 }
4945 }
4946
4947 if (is_illegal) {
4948 ResourceMark rm(THREAD);
4949 Exceptions::fthrow(
4950 THREAD_AND_LOCATION,
4951 vmSymbols::java_lang_ClassFormatError(),
4952 "Method %s in class %s%s has illegal modifiers: 0x%X",
4953 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
4954 return;
4955 }
4956 }
4957
4958 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4959 int length,
4960 TRAPS) const {
4961 assert(_need_verify, "only called when _need_verify is true");
4962 if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4963 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4964 }
4965 }
4966
4967 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4968 // In class names, '/' separates unqualified names. This is verified in this function also.
4969 // Method names also may not contain the characters '<' or '>', unless <init>
4970 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4971 // method. Because these names have been checked as special cases before
4972 // calling this method in verify_legal_method_name.
4973 //
5091 // be taken as a field signature. Allow "void" if void_ok.
5092 // Return a pointer to just past the signature.
5093 // Return NULL if no legal signature is found.
5094 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5095 bool void_ok,
5096 unsigned int length,
5097 TRAPS) const {
5098 unsigned int array_dim = 0;
5099 while (length > 0) {
5100 switch (signature[0]) {
5101 case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5102 case JVM_SIGNATURE_BOOLEAN:
5103 case JVM_SIGNATURE_BYTE:
5104 case JVM_SIGNATURE_CHAR:
5105 case JVM_SIGNATURE_SHORT:
5106 case JVM_SIGNATURE_INT:
5107 case JVM_SIGNATURE_FLOAT:
5108 case JVM_SIGNATURE_LONG:
5109 case JVM_SIGNATURE_DOUBLE:
5110 return signature + 1;
5111 case JVM_SIGNATURE_INLINE_TYPE:
5112 // Can't enable this check until JDK upgrades the bytecode generators
5113 // if (_major_version < CONSTANT_CLASS_DESCRIPTORS ) {
5114 // classfile_parse_error("Class name contains illegal Q-signature "
5115 // "in descriptor in class file %s",
5116 // CHECK_0);
5117 // }
5118 // fall through
5119 case JVM_SIGNATURE_CLASS:
5120 {
5121 if (_major_version < JAVA_1_5_VERSION) {
5122 // Skip over the class name if one is there
5123 const char* const p = skip_over_field_name(signature + 1, true, --length);
5124
5125 // The next character better be a semicolon
5126 if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5127 return p + 1;
5128 }
5129 }
5130 else {
5131 // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5132 signature++;
5133 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5134 // Format check signature
5135 if (c != NULL) {
5136 int newlen = c - (char*) signature;
5137 bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5138 if (!legal) {
5139 classfile_parse_error("Class name is empty or contains illegal character "
5140 "in descriptor in class file %s",
5141 THREAD);
5142 return NULL;
5143 }
5144 return signature + newlen + 1;
5145 }
5146 }
5147 return NULL;
5148 }
5149 case JVM_SIGNATURE_ARRAY:
5150 array_dim++;
5151 if (array_dim > 255) {
5167
5168 // Checks if name is a legal class name.
5169 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5170 if (!_need_verify || _relax_verify) { return; }
5171
5172 assert(name->refcount() > 0, "symbol must be kept alive");
5173 char* bytes = (char*)name->bytes();
5174 unsigned int length = name->utf8_length();
5175 bool legal = false;
5176
5177 if (length > 0) {
5178 const char* p;
5179 if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5180 p = skip_over_field_signature(bytes, false, length, CHECK);
5181 legal = (p != NULL) && ((p - bytes) == (int)length);
5182 } else if (_major_version < JAVA_1_5_VERSION) {
5183 if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5184 p = skip_over_field_name(bytes, true, length);
5185 legal = (p != NULL) && ((p - bytes) == (int)length);
5186 }
5187 } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
5188 && bytes[length - 1] == ';' ) {
5189 // Support for L...; and Q...; descriptors
5190 legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5191 } else {
5192 // 4900761: relax the constraints based on JSR202 spec
5193 // Class names may be drawn from the entire Unicode character set.
5194 // Identifiers between '/' must be unqualified names.
5195 // The utf8 string has been verified when parsing cpool entries.
5196 legal = verify_unqualified_name(bytes, length, LegalClass);
5197 }
5198 }
5199 if (!legal) {
5200 ResourceMark rm(THREAD);
5201 assert(_class_name != NULL, "invariant");
5202 Exceptions::fthrow(
5203 THREAD_AND_LOCATION,
5204 vmSymbols::java_lang_ClassFormatError(),
5205 "Illegal class name \"%.*s\" in class file %s", length, bytes,
5206 _class_name->as_C_string()
5207 );
5208 return;
5209 }
5210 }
5268
5269 if (!legal) {
5270 ResourceMark rm(THREAD);
5271 assert(_class_name != NULL, "invariant");
5272 Exceptions::fthrow(
5273 THREAD_AND_LOCATION,
5274 vmSymbols::java_lang_ClassFormatError(),
5275 "Illegal method name \"%.*s\" in class %s", length, bytes,
5276 _class_name->as_C_string()
5277 );
5278 return;
5279 }
5280 }
5281
5282
5283 // Checks if signature is a legal field signature.
5284 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5285 const Symbol* signature,
5286 TRAPS) const {
5287 if (!_need_verify) { return; }
5288 if (!supports_inline_types() && (signature->is_Q_signature() || signature->is_Q_array_signature())) {
5289 throwIllegalSignature("Field", name, signature, CHECK);
5290 }
5291
5292 const char* const bytes = (const char* const)signature->bytes();
5293 const unsigned int length = signature->utf8_length();
5294 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5295
5296 if (p == NULL || (p - bytes) != (int)length) {
5297 throwIllegalSignature("Field", name, signature, CHECK);
5298 }
5299 }
5300
5301 // Check that the signature is compatible with the method name. For example,
5302 // check that <init> has a void signature.
5303 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5304 const Symbol* signature,
5305 TRAPS) const {
5306 if (!_need_verify) {
5307 return;
5308 }
5309
5310 // Class initializers cannot have args for class format version >= 51.
5311 if (name == vmSymbols::class_initializer_name() &&
5312 signature != vmSymbols::void_method_signature() &&
5313 _major_version >= JAVA_7_VERSION) {
5314 throwIllegalSignature("Method", name, signature, THREAD);
5315 return;
5316 }
5317
5318 if (!is_inline_type()) {
5319 int sig_length = signature->utf8_length();
5320 if (name->utf8_length() > 0 &&
5321 name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5322 sig_length > 0 &&
5323 signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5324 throwIllegalSignature("Method", name, signature, THREAD);
5325 }
5326 }
5327 }
5328
5329 // Checks if signature is a legal method signature.
5330 // Returns number of parameters
5331 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5332 const Symbol* signature,
5333 TRAPS) const {
5334 if (!_need_verify) {
5335 // make sure caller's args_size will be less than 0 even for non-static
5336 // method so it will be recomputed in compute_size_of_parameters().
5337 return -2;
5338 }
5339
5340 unsigned int args_size = 0;
5341 const char* p = (const char*)signature->bytes();
5342 unsigned int length = signature->utf8_length();
5343 const char* nextp;
5344
5345 // The first character must be a '('
5482 }
5483
5484 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5485 const ClassInstanceInfo& cl_inst_info,
5486 TRAPS) {
5487 if (_klass != NULL) {
5488 return _klass;
5489 }
5490
5491 InstanceKlass* const ik =
5492 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5493
5494 if (is_hidden()) {
5495 mangle_hidden_class_name(ik);
5496 }
5497
5498 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5499
5500 assert(_klass == ik, "invariant");
5501
5502 if (ik->is_inline_klass()) {
5503 InlineKlass* vk = InlineKlass::cast(ik);
5504 oop val = ik->allocate_instance(CHECK_NULL);
5505 vk->set_default_value(val);
5506 }
5507
5508 return ik;
5509 }
5510
5511 // Return true if the specified class is not a valid super class for an inline type.
5512 // A valid super class for an inline type is abstract, has no instance fields,
5513 // does not implement interface java.lang.IdentityObject (checked elsewhere), has
5514 // an empty body-less no-arg constructor, and no synchronized instance methods.
5515 // This function doesn't check if the class's super types are invalid. Those checks
5516 // are done elsewhere. The final determination of whether or not a class is an
5517 // invalid super type for an inline class is done in fill_instance_klass().
5518 bool ClassFileParser::is_invalid_super_for_inline_type() {
5519 if (class_name() == vmSymbols::java_lang_IdentityObject()) {
5520 return true;
5521 }
5522 if (is_interface() || class_name() == vmSymbols::java_lang_Object()) {
5523 return false;
5524 }
5525 if (!access_flags().is_abstract() || _has_nonstatic_fields) {
5526 return true;
5527 } else {
5528 // Look at each method
5529 for (int x = 0; x < _methods->length(); x++) {
5530 const Method* const method = _methods->at(x);
5531 if (method->is_synchronized() && !method->is_static()) {
5532 return true;
5533
5534 } else if (method->name() == vmSymbols::object_initializer_name()) {
5535 if (method->signature() != vmSymbols::void_method_signature() ||
5536 !method->is_vanilla_constructor()) {
5537 return true;
5538 }
5539 }
5540 }
5541 }
5542 return false;
5543 }
5544
5545 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5546 bool changed_by_loadhook,
5547 const ClassInstanceInfo& cl_inst_info,
5548 TRAPS) {
5549 assert(ik != NULL, "invariant");
5550
5551 // Set name and CLD before adding to CLD
5552 ik->set_class_loader_data(_loader_data);
5553 ik->set_name(_class_name);
5554
5555 // Add all classes to our internal class loader list here,
5556 // including classes in the bootstrap (NULL) class loader.
5557 const bool publicize = !is_internal();
5558
5559 _loader_data->add_class(ik, publicize);
5560
5561 set_klass_to_deallocate(ik);
5562
5563 assert(_field_info != NULL, "invariant");
5564 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5565 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5566 "sanity");
5567
5568 assert(ik->is_instance_klass(), "sanity");
5569 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5570
5571 // Fill in information already parsed
5572 ik->set_should_verify_class(_need_verify);
5573
5574 // Not yet: supers are done below to support the new subtype-checking fields
5575 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5576 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5577 if (_field_info->_is_naturally_atomic && ik->is_inline_klass()) {
5578 ik->set_is_naturally_atomic();
5579 }
5580
5581 if (this->_invalid_inline_super) {
5582 ik->set_invalid_inline_super();
5583 }
5584
5585 if (_has_injected_identityObject) {
5586 ik->set_has_injected_identityObject();
5587 }
5588 if (_has_injected_primitiveObject) {
5589 ik->set_has_injected_primitiveObject();
5590 }
5591
5592 assert(_fac != NULL, "invariant");
5593 ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_INLINE]);
5594
5595 // this transfers ownership of a lot of arrays from
5596 // the parser onto the InstanceKlass*
5597 apply_parsed_class_metadata(ik, _java_fields_count);
5598
5599 // can only set dynamic nest-host after static nest information is set
5600 if (cl_inst_info.dynamic_nest_host() != NULL) {
5601 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5602 }
5603
5604 // note that is not safe to use the fields in the parser from this point on
5605 assert(NULL == _cp, "invariant");
5606 assert(NULL == _fields, "invariant");
5607 assert(NULL == _methods, "invariant");
5608 assert(NULL == _inner_classes, "invariant");
5609 assert(NULL == _nest_members, "invariant");
5610 assert(NULL == _combined_annotations, "invariant");
5611 assert(NULL == _record_components, "invariant");
5612 assert(NULL == _permitted_subclasses, "invariant");
5613
5623 // has to be changed accordingly.
5624 ik->set_initial_method_idnum(ik->methods()->length());
5625
5626 ik->set_this_class_index(_this_class_index);
5627
5628 if (_is_hidden) {
5629 // _this_class_index is a CONSTANT_Class entry that refers to this
5630 // hidden class itself. If this class needs to refer to its own methods
5631 // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5632 // _this_class_index. However, because this class is hidden (it's
5633 // not stored in SystemDictionary), _this_class_index cannot be resolved
5634 // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5635 // Therefore, we must eagerly resolve _this_class_index now.
5636 ik->constants()->klass_at_put(_this_class_index, ik);
5637 }
5638
5639 ik->set_minor_version(_minor_version);
5640 ik->set_major_version(_major_version);
5641 ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5642 ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5643 if (_is_declared_atomic) {
5644 ik->set_is_declared_atomic();
5645 }
5646
5647 if (_is_hidden) {
5648 ik->set_is_hidden();
5649 }
5650
5651 // Set PackageEntry for this_klass
5652 oop cl = ik->class_loader();
5653 Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5654 ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5655 ik->set_package(cld, NULL, CHECK);
5656
5657 const Array<Method*>* const methods = ik->methods();
5658 assert(methods != NULL, "invariant");
5659 const int methods_len = methods->length();
5660
5661 check_methods_for_intrinsics(ik, methods);
5662
5663 // Fill in field values obtained by parse_classfile_attributes
5664 if (_parsed_annotations->has_any_annotations()) {
5665 _parsed_annotations->apply_to(ik);
5733
5734 assert(_all_mirandas != NULL, "invariant");
5735
5736 // Generate any default methods - default methods are public interface methods
5737 // that have a default implementation. This is new with Java 8.
5738 if (_has_nonstatic_concrete_methods) {
5739 DefaultMethods::generate_default_methods(ik,
5740 _all_mirandas,
5741 CHECK);
5742 }
5743
5744 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5745 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5746 !module_entry->has_default_read_edges()) {
5747 if (!module_entry->set_has_default_read_edges()) {
5748 // We won a potential race
5749 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5750 }
5751 }
5752
5753 bool all_fields_empty = true;
5754 int nfields = ik->java_fields_count();
5755 if (ik->is_inline_klass()) nfields++;
5756 for (int i = 0; i < nfields; i++) {
5757 if (((ik->field_access_flags(i) & JVM_ACC_STATIC) == 0)) {
5758 if (ik->field_is_null_free_inline_type(i)) {
5759 Symbol* klass_name = ik->field_signature(i)->fundamental_name(CHECK);
5760 // Inline classes for instance fields must have been pre-loaded
5761 // Inline classes for static fields might not have been loaded yet
5762 InstanceKlass* klass = SystemDictionary::find_instance_klass(klass_name,
5763 Handle(THREAD, ik->class_loader()),
5764 Handle(THREAD, ik->protection_domain()));
5765 assert(klass != NULL, "Just checking");
5766 assert(klass->access_flags().is_inline_type(), "Inline type expected");
5767 ik->set_inline_type_field_klass(i, klass);
5768 klass_name->decrement_refcount();
5769 if (!InlineKlass::cast(klass)->is_empty_inline_type()) { all_fields_empty = false; }
5770 } else {
5771 all_fields_empty = false;
5772 }
5773 } else if (is_inline_type() && ((ik->field_access_flags(i) & JVM_ACC_FIELD_INTERNAL) != 0)) {
5774 InlineKlass::cast(ik)->set_default_value_offset(ik->field_offset(i));
5775 }
5776 }
5777
5778 if (_is_empty_inline_type || (is_inline_type() && all_fields_empty)) {
5779 ik->set_is_empty_inline_type();
5780 }
5781
5782 if (is_inline_type()) {
5783 InlineKlass* vk = InlineKlass::cast(ik);
5784 vk->set_alignment(_alignment);
5785 vk->set_first_field_offset(_first_field_offset);
5786 vk->set_exact_size_in_bytes(_exact_size_in_bytes);
5787 InlineKlass::cast(ik)->initialize_calling_convention(CHECK);
5788 }
5789
5790 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5791
5792 if (!is_internal()) {
5793 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5794
5795 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5796 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5797 log_is_enabled(Info, class, preview)) {
5798 ResourceMark rm;
5799 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5800 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5801 }
5802
5803 if (log_is_enabled(Debug, class, resolve)) {
5804 ResourceMark rm;
5805 // print out the superclass.
5806 const char * from = ik->external_name();
5807 if (ik->java_super() != NULL) {
5808 log_debug(class, resolve)("%s %s (super)",
5809 from,
5815 const int length = local_interfaces->length();
5816 for (int i = 0; i < length; i++) {
5817 const InstanceKlass* const k = local_interfaces->at(i);
5818 const char * to = k->external_name();
5819 log_debug(class, resolve)("%s %s (interface)", from, to);
5820 }
5821 }
5822 }
5823 }
5824
5825 JFR_ONLY(INIT_ID(ik);)
5826
5827 // If we reach here, all is well.
5828 // Now remove the InstanceKlass* from the _klass_to_deallocate field
5829 // in order for it to not be destroyed in the ClassFileParser destructor.
5830 set_klass_to_deallocate(NULL);
5831
5832 // it's official
5833 set_klass(ik);
5834
5835 // the common single interface arrays need setup here to provide the
5836 // correct answer to "compute_transitive_interfaces()", during
5837 // "SystemDictionary::initialize()"
5838 if (ik->name() == vmSymbols::java_lang_IdentityObject()) {
5839 Universe::initialize_the_single_IdentityObject_klass_array(ik, CHECK);
5840 }
5841 if (ik->name() == vmSymbols::java_lang_PrimitiveObject()) {
5842 Universe::initialize_the_single_PrimitiveObject_klass_array(ik, CHECK);
5843 }
5844
5845 debug_only(ik->verify();)
5846 }
5847
5848 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5849 // Decrement the refcount in the old name, since we're clobbering it.
5850 _class_name->decrement_refcount();
5851
5852 _class_name = new_class_name;
5853 // Increment the refcount of the new name.
5854 // Now the ClassFileParser owns this name and will decrement in
5855 // the destructor.
5856 _class_name->increment_refcount();
5857 }
5858
5859 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5860 bool trusted = loader_data->is_boot_class_loader_data() ||
5861 loader_data->is_platform_class_loader_data();
5862 bool need_verify =
5863 // verifyAll
5864 (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5871 Symbol* name,
5872 ClassLoaderData* loader_data,
5873 const ClassLoadInfo* cl_info,
5874 Publicity pub_level,
5875 TRAPS) :
5876 _stream(stream),
5877 _class_name(NULL),
5878 _loader_data(loader_data),
5879 _is_hidden(cl_info->is_hidden()),
5880 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5881 _orig_cp_size(0),
5882 _super_klass(),
5883 _cp(NULL),
5884 _fields(NULL),
5885 _methods(NULL),
5886 _inner_classes(NULL),
5887 _nest_members(NULL),
5888 _nest_host(0),
5889 _permitted_subclasses(NULL),
5890 _record_components(NULL),
5891 _temp_local_interfaces(NULL),
5892 _local_interfaces(NULL),
5893 _transitive_interfaces(NULL),
5894 _combined_annotations(NULL),
5895 _class_annotations(NULL),
5896 _class_type_annotations(NULL),
5897 _fields_annotations(NULL),
5898 _fields_type_annotations(NULL),
5899 _klass(NULL),
5900 _klass_to_deallocate(NULL),
5901 _parsed_annotations(NULL),
5902 _fac(NULL),
5903 _field_info(NULL),
5904 _method_ordering(NULL),
5905 _all_mirandas(NULL),
5906 _vtable_size(0),
5907 _itable_size(0),
5908 _num_miranda_methods(0),
5909 _rt(REF_NONE),
5910 _protection_domain(cl_info->protection_domain()),
5911 _access_flags(),
5912 _pub_level(pub_level),
5913 _bad_constant_seen(0),
5914 _synthetic_flag(false),
5915 _sde_length(false),
5916 _sde_buffer(NULL),
5917 _sourcefile_index(0),
5918 _generic_signature_index(0),
5919 _major_version(0),
5920 _minor_version(0),
5921 _this_class_index(0),
5922 _super_class_index(0),
5923 _itfs_len(0),
5924 _java_fields_count(0),
5925 _need_verify(false),
5926 _relax_verify(false),
5927 _has_nonstatic_concrete_methods(false),
5928 _declares_nonstatic_concrete_methods(false),
5929 _has_final_method(false),
5930 _has_contended_fields(false),
5931 _has_inline_type_fields(false),
5932 _has_nonstatic_fields(false),
5933 _is_empty_inline_type(false),
5934 _is_naturally_atomic(false),
5935 _is_declared_atomic(false),
5936 _invalid_inline_super(false),
5937 _invalid_identity_super(false),
5938 _implements_identityObject(false),
5939 _has_injected_identityObject(false),
5940 _implements_primitiveObject(false),
5941 _has_injected_primitiveObject(false),
5942 _has_finalizer(false),
5943 _has_empty_finalizer(false),
5944 _has_vanilla_constructor(false),
5945 _max_bootstrap_specifier_index(-1) {
5946
5947 _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5948 _class_name->increment_refcount();
5949
5950 assert(_loader_data != NULL, "invariant");
5951 assert(stream != NULL, "invariant");
5952 assert(_stream != NULL, "invariant");
5953 assert(_stream->buffer() == _stream->current(), "invariant");
5954 assert(_class_name != NULL, "invariant");
5955 assert(0 == _access_flags.as_int(), "invariant");
5956
5957 // Figure out whether we can skip format checking (matching classic VM behavior)
5958 if (DumpSharedSpaces) {
5959 // verify == true means it's a 'remote' class (i.e., non-boot class)
5960 // Verification decision is based on BytecodeVerificationRemote flag
5961 // for those classes.
6094 cp_size, CHECK);
6095
6096 _orig_cp_size = cp_size;
6097 if (is_hidden()) { // Add a slot for hidden class name.
6098 cp_size++;
6099 }
6100
6101 _cp = ConstantPool::allocate(_loader_data,
6102 cp_size,
6103 CHECK);
6104
6105 ConstantPool* const cp = _cp;
6106
6107 parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6108
6109 assert(cp_size == (const u2)cp->length(), "invariant");
6110
6111 // ACCESS FLAGS
6112 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
6113
6114 jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
6115 // JVM_ACC_MODULE is defined in JDK-9 and later.
6116 if (_major_version >= JAVA_9_VERSION) {
6117 recognized_modifiers |= JVM_ACC_MODULE;
6118 }
6119 // JVM_ACC_INLINE is defined for class file version 55 and later
6120 if (supports_inline_types()) {
6121 recognized_modifiers |= JVM_ACC_INLINE;
6122 }
6123
6124 // Access flags
6125 jint flags = stream->get_u2_fast() & recognized_modifiers;
6126
6127 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6128 // Set abstract bit for old class files for backward compatibility
6129 flags |= JVM_ACC_ABSTRACT;
6130 }
6131
6132 verify_legal_class_modifiers(flags, CHECK);
6133
6134 short bad_constant = class_bad_constant_seen();
6135 if (bad_constant != 0) {
6136 // Do not throw CFE until after the access_flags are checked because if
6137 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6138 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6139 return;
6140 }
6141
6142 _access_flags.set_flags(flags);
6143
6144 // This class and superclass
6145 _this_class_index = stream->get_u2_fast();
6212 if (stream->source() != NULL) {
6213 ls.print(" source: %s", stream->source());
6214 }
6215 ls.cr();
6216 }
6217 }
6218
6219 // SUPERKLASS
6220 _super_class_index = stream->get_u2_fast();
6221 _super_klass = parse_super_class(cp,
6222 _super_class_index,
6223 _need_verify,
6224 CHECK);
6225
6226 // Interfaces
6227 _itfs_len = stream->get_u2_fast();
6228 parse_interfaces(stream,
6229 _itfs_len,
6230 cp,
6231 &_has_nonstatic_concrete_methods,
6232 &_is_declared_atomic,
6233 CHECK);
6234
6235 assert(_temp_local_interfaces != NULL, "invariant");
6236
6237 // Fields (offsets are filled in later)
6238 _fac = new FieldAllocationCount();
6239 parse_fields(stream,
6240 is_interface(),
6241 is_inline_type(),
6242 _fac,
6243 cp,
6244 cp_size,
6245 &_java_fields_count,
6246 CHECK);
6247
6248 assert(_fields != NULL, "invariant");
6249
6250 // Methods
6251 AccessFlags promoted_flags;
6252 parse_methods(stream,
6253 is_interface(),
6254 is_inline_type(),
6255 &promoted_flags,
6256 &_has_final_method,
6257 &_declares_nonstatic_concrete_methods,
6258 CHECK);
6259
6260 assert(_methods != NULL, "invariant");
6261
6262 // promote flags from parse_methods() to the klass' flags
6263 _access_flags.add_promoted_flags(promoted_flags.as_int());
6264
6265 if (_declares_nonstatic_concrete_methods) {
6266 _has_nonstatic_concrete_methods = true;
6267 }
6268
6269 // Additional attributes/annotations
6270 _parsed_annotations = new ClassAnnotationCollector();
6271 parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6272
6273 assert(_inner_classes != NULL, "invariant");
6274
6316
6317 // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6318 // We have to update the resolved_klass_index and the name_index together
6319 // so extract the existing resolved_klass_index first.
6320 CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6321 int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6322 _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6323 assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6324 "Bad name_index");
6325 }
6326
6327 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6328 ConstantPool* cp,
6329 TRAPS) {
6330 assert(stream != NULL, "invariant");
6331 assert(stream->at_eos(), "invariant");
6332 assert(cp != NULL, "invariant");
6333 assert(_loader_data != NULL, "invariant");
6334
6335 if (_class_name == vmSymbols::java_lang_Object()) {
6336 check_property(_temp_local_interfaces->length() == 0,
6337 "java.lang.Object cannot implement an interface in class file %s",
6338 CHECK);
6339 }
6340 // We check super class after class file is parsed and format is checked
6341 if (_super_class_index > 0 && NULL == _super_klass) {
6342 Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6343 if (is_interface()) {
6344 // Before attempting to resolve the superclass, check for class format
6345 // errors not checked yet.
6346 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6347 "Interfaces must have java.lang.Object as superclass in class file %s",
6348 CHECK);
6349 }
6350 Handle loader(THREAD, _loader_data->class_loader());
6351 _super_klass = (const InstanceKlass*)
6352 SystemDictionary::resolve_super_or_fail(_class_name,
6353 super_class_name,
6354 loader,
6355 _protection_domain,
6356 true,
6357 CHECK);
6358 }
6359
6360 if (_super_klass != NULL) {
6361 if (_super_klass->has_nonstatic_concrete_methods()) {
6362 _has_nonstatic_concrete_methods = true;
6363 }
6364 if (_super_klass->is_declared_atomic()) {
6365 _is_declared_atomic = true;
6366 }
6367
6368 if (_super_klass->is_interface()) {
6369 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6370 return;
6371 }
6372
6373 // For an inline class, only java/lang/Object or special abstract classes
6374 // are acceptable super classes.
6375 if (is_inline_type()) {
6376 const InstanceKlass* super_ik = _super_klass;
6377 if (super_ik->invalid_inline_super()) {
6378 classfile_icce_error("inline class %s has an invalid super class %s", _super_klass, THREAD);
6379 return;
6380 }
6381 }
6382 }
6383
6384 if (_class_name == vmSymbols::java_lang_NonTearable() && _loader_data->class_loader() == NULL) {
6385 // This is the original source of this condition.
6386 // It propagates by inheritance, as if testing "instanceof NonTearable".
6387 _is_declared_atomic = true;
6388 } else if (*ForceNonTearable != '\0') {
6389 // Allow a command line switch to force the same atomicity property:
6390 const char* class_name_str = _class_name->as_C_string();
6391 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6392 _is_declared_atomic = true;
6393 }
6394 }
6395
6396 // Set ik->invalid_inline_super field to TRUE if already marked as invalid,
6397 // if super is marked invalid, or if is_invalid_super_for_inline_type()
6398 // returns true
6399 if (invalid_inline_super() ||
6400 (_super_klass != NULL && _super_klass->invalid_inline_super()) ||
6401 is_invalid_super_for_inline_type()) {
6402 set_invalid_inline_super();
6403 }
6404
6405 if (EnableValhalla && !is_inline_type() && invalid_inline_super() && (_super_klass == NULL || !_super_klass->invalid_inline_super())
6406 && !_implements_identityObject && class_name() != vmSymbols::java_lang_IdentityObject()) {
6407 _temp_local_interfaces->append(vmClasses::IdentityObject_klass());
6408 _has_injected_identityObject = true;
6409 }
6410 // Check if declared as PrimitiveObject...else add if needed
6411 if (_implements_primitiveObject) {
6412 if (!is_inline_type() && invalid_inline_super()) {
6413 classfile_icce_error("class %s can not implement %s, neither valid inline classes or valid supertype",
6414 vmClasses::PrimitiveObject_klass(), THREAD);
6415 return;
6416 }
6417 } else if (is_inline_type()) {
6418 _temp_local_interfaces->append(vmClasses::PrimitiveObject_klass());
6419 _has_injected_primitiveObject = true;
6420 }
6421
6422 int itfs_len = _temp_local_interfaces->length();
6423 if (itfs_len == 0) {
6424 _local_interfaces = Universe::the_empty_instance_klass_array();
6425 } else if (itfs_len == 1 && _temp_local_interfaces->at(0) == vmClasses::IdentityObject_klass()) {
6426 _local_interfaces = Universe::the_single_IdentityObject_klass_array();
6427 } else if (itfs_len == 1 && _temp_local_interfaces->at(0) == vmClasses::PrimitiveObject_klass()) {
6428 _local_interfaces = Universe::the_single_PrimitiveObject_klass_array();
6429 } else {
6430 _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
6431 for (int i = 0; i < itfs_len; i++) {
6432 _local_interfaces->at_put(i, _temp_local_interfaces->at(i));
6433 }
6434 }
6435 _temp_local_interfaces = NULL;
6436 assert(_local_interfaces != NULL, "invariant");
6437
6438 // Compute the transitive list of all unique interfaces implemented by this class
6439 _transitive_interfaces =
6440 compute_transitive_interfaces(_super_klass,
6441 _local_interfaces,
6442 _loader_data,
6443 CHECK);
6444
6445 assert(_transitive_interfaces != NULL, "invariant");
6446
6447 // sort methods
6448 _method_ordering = sort_methods(_methods);
6449
6450 _all_mirandas = new GrowableArray<Method*>(20);
6451
6452 Handle loader(THREAD, _loader_data->class_loader());
6453 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6454 &_num_miranda_methods,
6455 _all_mirandas,
6456 _super_klass,
6457 _methods,
6458 _access_flags,
6459 _major_version,
6460 loader,
6461 _class_name,
6462 _local_interfaces);
6463
6464 // Size of Java itable (in words)
6465 _itable_size = is_interface() ? 0 :
6466 klassItable::compute_itable_size(_transitive_interfaces);
6467
6468 assert(_fac != NULL, "invariant");
6469 assert(_parsed_annotations != NULL, "invariant");
6470
6471
6472 if (EnableValhalla) {
6473 for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6474 if (Signature::basic_type(fs.signature()) == T_INLINE_TYPE && !fs.access_flags().is_static()) {
6475 // Pre-load inline class
6476 Klass* klass = SystemDictionary::resolve_inline_type_field_or_fail(&fs,
6477 Handle(THREAD, _loader_data->class_loader()),
6478 _protection_domain, true, CHECK);
6479 assert(klass != NULL, "Sanity check");
6480 if (!klass->access_flags().is_inline_type()) {
6481 assert(klass->is_instance_klass(), "Sanity check");
6482 ResourceMark rm(THREAD);
6483 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6484 err_msg("Class %s expects class %s to be an inline type, but it is not",
6485 _class_name->as_C_string(),
6486 InstanceKlass::cast(klass)->external_name()));
6487 }
6488 }
6489 }
6490 }
6491
6492 _field_info = new FieldLayoutInfo();
6493 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6494 _parsed_annotations->is_contended(), is_inline_type(),
6495 loader_data(), _protection_domain, _field_info);
6496 lb.build_layout(CHECK);
6497 if (is_inline_type()) {
6498 _alignment = lb.get_alignment();
6499 _first_field_offset = lb.get_first_field_offset();
6500 _exact_size_in_bytes = lb.get_exact_size_in_byte();
6501 }
6502 _has_inline_type_fields = _field_info->_has_inline_fields;
6503
6504 // Compute reference type
6505 _rt = (NULL ==_super_klass) ? REF_NONE : _super_klass->reference_type();
6506 }
6507
6508 void ClassFileParser::set_klass(InstanceKlass* klass) {
6509
6510 #ifdef ASSERT
6511 if (klass != NULL) {
6512 assert(NULL == _klass, "leaking?");
6513 }
6514 #endif
6515
6516 _klass = klass;
6517 }
6518
6519 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6520
6521 #ifdef ASSERT
6522 if (klass != NULL) {
6523 assert(NULL == _klass_to_deallocate, "leaking?");
6524 }
6525 #endif
6526
6527 _klass_to_deallocate = klass;
6528 }
6529
6530 // Caller responsible for ResourceMark
6531 // clone stream with rewound position
6532 const ClassFileStream* ClassFileParser::clone_stream() const {
6533 assert(_stream != NULL, "invariant");
6534
6535 return _stream->clone();
6536 }
6537
6538 // ----------------------------------------------------------------------------
6539 // debugging
6540
6541 #ifdef ASSERT
6542
6543 // return true if class_name contains no '.' (internal format is '/')
6544 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6545 if (class_name != NULL) {
6546 ResourceMark rm;
6547 char* name = class_name->as_C_string();
6548 return strchr(name, JVM_SIGNATURE_DOT) == NULL;
6549 } else {
6550 return true;
6551 }
6552 }
6553
6554 #endif
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