4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 #include "cds/cdsConfig.hpp"
25 #include "classfile/classFileParser.hpp"
26 #include "classfile/classFileStream.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/classLoadInfo.hpp"
30 #include "classfile/defaultMethods.hpp"
31 #include "classfile/fieldLayoutBuilder.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "jvm.h"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.hpp"
45 #include "memory/metadataFactory.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/annotations.hpp"
50 #include "oops/bsmAttribute.inline.hpp"
51 #include "oops/constantPool.inline.hpp"
52 #include "oops/fieldInfo.hpp"
53 #include "oops/fieldStreams.inline.hpp"
54 #include "oops/instanceKlass.inline.hpp"
55 #include "oops/instanceMirrorKlass.hpp"
56 #include "oops/klass.inline.hpp"
57 #include "oops/klassVtable.hpp"
58 #include "oops/metadata.hpp"
59 #include "oops/method.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/recordComponent.hpp"
62 #include "oops/symbol.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "prims/jvmtiThreadState.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/fieldDescriptor.inline.hpp"
67 #include "runtime/handles.inline.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/os.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/reflection.hpp"
72 #include "runtime/safepointVerifiers.hpp"
73 #include "runtime/signature.hpp"
74 #include "runtime/timer.hpp"
75 #include "services/classLoadingService.hpp"
76 #include "services/threadService.hpp"
77 #include "utilities/align.hpp"
78 #include "utilities/bitMap.inline.hpp"
79 #include "utilities/checkedCast.hpp"
80 #include "utilities/copy.hpp"
81 #include "utilities/exceptions.hpp"
82 #include "utilities/formatBuffer.hpp"
83 #include "utilities/globalDefinitions.hpp"
84 #include "utilities/growableArray.hpp"
85 #include "utilities/hashTable.hpp"
86 #include "utilities/macros.hpp"
87 #include "utilities/ostream.hpp"
88 #include "utilities/utf8.hpp"
89 #if INCLUDE_CDS
90 #include "classfile/systemDictionaryShared.hpp"
91 #endif
92
93 // We generally try to create the oops directly when parsing, rather than
94 // allocating temporary data structures and copying the bytes twice. A
95 // temporary area is only needed when parsing utf8 entries in the constant
96 // pool and when parsing line number tables.
97
98 // We add assert in debug mode when class format is not checked.
99
100 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
101 #define JAVA_MIN_SUPPORTED_VERSION 45
102 #define JAVA_PREVIEW_MINOR_VERSION 65535
103
104 // Used for two backward compatibility reasons:
105 // - to check for new additions to the class file format in JDK1.5
106 // - to check for bug fixes in the format checker in JDK1.5
107 #define JAVA_1_5_VERSION 49
481 guarantee_property(valid_symbol_at(name_ref_index),
482 "Invalid constant pool index %u in class file %s",
483 name_ref_index, CHECK);
484 guarantee_property(valid_symbol_at(signature_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 signature_ref_index, CHECK);
487 break;
488 }
489 case JVM_CONSTANT_Utf8:
490 break;
491 case JVM_CONSTANT_UnresolvedClass: // fall-through
492 case JVM_CONSTANT_UnresolvedClassInError: {
493 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
494 break;
495 }
496 case JVM_CONSTANT_ClassIndex: {
497 const int class_index = cp->klass_index_at(index);
498 guarantee_property(valid_symbol_at(class_index),
499 "Invalid constant pool index %u in class file %s",
500 class_index, CHECK);
501 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
502 break;
503 }
504 case JVM_CONSTANT_StringIndex: {
505 const int string_index = cp->string_index_at(index);
506 guarantee_property(valid_symbol_at(string_index),
507 "Invalid constant pool index %u in class file %s",
508 string_index, CHECK);
509 Symbol* const sym = cp->symbol_at(string_index);
510 cp->unresolved_string_at_put(index, sym);
511 break;
512 }
513 case JVM_CONSTANT_MethodHandle: {
514 const int ref_index = cp->method_handle_index_at(index);
515 guarantee_property(valid_cp_range(ref_index, length),
516 "Invalid constant pool index %u in class file %s",
517 ref_index, CHECK);
518 const constantTag tag = cp->tag_at(ref_index);
519 const int ref_kind = cp->method_handle_ref_kind_at(index);
520
922 class AnnotationCollector : public ResourceObj{
923 public:
924 enum Location { _in_field, _in_method, _in_class };
925 enum ID {
926 _unknown = 0,
927 _method_CallerSensitive,
928 _method_ForceInline,
929 _method_DontInline,
930 _method_ChangesCurrentThread,
931 _method_JvmtiHideEvents,
932 _method_JvmtiMountTransition,
933 _method_InjectedProfile,
934 _method_LambdaForm_Compiled,
935 _method_Hidden,
936 _method_Scoped,
937 _method_IntrinsicCandidate,
938 _jdk_internal_vm_annotation_Contended,
939 _field_Stable,
940 _jdk_internal_vm_annotation_ReservedStackAccess,
941 _jdk_internal_ValueBased,
942 _java_lang_Deprecated,
943 _java_lang_Deprecated_for_removal,
944 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
945 _method_AOTRuntimeSetup,
946 _jdk_internal_vm_annotation_TrustFinalFields,
947 _annotation_LIMIT
948 };
949 const Location _location;
950 int _annotations_present;
951 u2 _contended_group;
952
953 AnnotationCollector(Location location)
954 : _location(location), _annotations_present(0), _contended_group(0)
955 {
956 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
957 }
958 // If this annotation name has an ID, report it (or _none).
959 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
960 // Set the annotation name:
961 void set_annotation(ID id) {
1356 }
1357
1358 *constantvalue_index_addr = constantvalue_index;
1359 *is_synthetic_addr = is_synthetic;
1360 *generic_signature_index_addr = generic_signature_index;
1361 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1362 runtime_visible_annotations_length,
1363 CHECK);
1364 parsed_annotations->set_field_annotations(a);
1365 a = allocate_annotations(runtime_visible_type_annotations,
1366 runtime_visible_type_annotations_length,
1367 CHECK);
1368 parsed_annotations->set_field_type_annotations(a);
1369 return;
1370 }
1371
1372
1373 // Side-effects: populates the _fields, _fields_annotations,
1374 // _fields_type_annotations fields
1375 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1376 bool is_interface,
1377 ConstantPool* cp,
1378 const int cp_size,
1379 u2* const java_fields_count_ptr,
1380 TRAPS) {
1381
1382 assert(cfs != nullptr, "invariant");
1383 assert(cp != nullptr, "invariant");
1384 assert(java_fields_count_ptr != nullptr, "invariant");
1385
1386 assert(nullptr == _fields_annotations, "invariant");
1387 assert(nullptr == _fields_type_annotations, "invariant");
1388
1389 cfs->guarantee_more(2, CHECK); // length
1390 const u2 length = cfs->get_u2_fast();
1391 *java_fields_count_ptr = length;
1392
1393 int num_injected = 0;
1394 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1395 &num_injected);
1396 const int total_fields = length + num_injected;
1397
1398 // Allocate a temporary resource array to collect field data.
1399 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1400 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1401
1402 ResourceMark rm(THREAD);
1403 for (int n = 0; n < length; n++) {
1404 // access_flags, name_index, descriptor_index, attributes_count
1405 cfs->guarantee_more(8, CHECK);
1406
1407 AccessFlags access_flags;
1408 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1409 verify_legal_field_modifiers(flags, is_interface, CHECK);
1410 access_flags.set_flags(flags);
1411 FieldInfo::FieldFlags fieldFlags(0);
1412
1413 const u2 name_index = cfs->get_u2_fast();
1414 guarantee_property(valid_symbol_at(name_index),
1415 "Invalid constant pool index %u for field name in class file %s",
1416 name_index, CHECK);
1417 const Symbol* const name = cp->symbol_at(name_index);
1418 verify_legal_field_name(name, CHECK);
1419
1420 const u2 signature_index = cfs->get_u2_fast();
1421 guarantee_property(valid_symbol_at(signature_index),
1422 "Invalid constant pool index %u for field signature in class file %s",
1423 signature_index, CHECK);
1424 const Symbol* const sig = cp->symbol_at(signature_index);
1425 verify_legal_field_signature(name, sig, CHECK);
1426
1427 u2 constantvalue_index = 0;
1428 bool is_synthetic = false;
1429 u2 generic_signature_index = 0;
1430 const bool is_static = access_flags.is_static();
1431 FieldAnnotationCollector parsed_annotations(_loader_data);
1432
1433 const u2 attributes_count = cfs->get_u2_fast();
1434 if (attributes_count > 0) {
1435 parse_field_attributes(cfs,
1436 attributes_count,
1437 is_static,
1438 signature_index,
1439 &constantvalue_index,
1440 &is_synthetic,
1441 &generic_signature_index,
1442 &parsed_annotations,
1443 CHECK);
1444
1445 if (parsed_annotations.field_annotations() != nullptr) {
1446 if (_fields_annotations == nullptr) {
1447 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1448 _loader_data, length, nullptr,
1449 CHECK);
1450 }
1451 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1452 parsed_annotations.set_field_annotations(nullptr);
1453 }
1454 if (parsed_annotations.field_type_annotations() != nullptr) {
1455 if (_fields_type_annotations == nullptr) {
1456 _fields_type_annotations =
1457 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1458 length,
1459 nullptr,
1460 CHECK);
1461 }
1462 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1463 parsed_annotations.set_field_type_annotations(nullptr);
1464 }
1465
1466 if (is_synthetic) {
1467 access_flags.set_is_synthetic();
1468 }
1469 if (generic_signature_index != 0) {
1470 fieldFlags.update_generic(true);
1471 }
1472 }
1473
1474 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1475
1476 // Update number of static oop fields.
1477 if (is_static && is_reference_type(type)) {
1478 _static_oop_count++;
1479 }
1480
1481 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1482 fi.set_index(n);
1483 if (fieldFlags.is_generic()) {
1484 fi.set_generic_signature_index(generic_signature_index);
1485 }
1486 parsed_annotations.apply_to(&fi);
1487 if (fi.field_flags().is_contended()) {
1488 _has_contended_fields = true;
1489 }
1490 _temp_field_info->append(fi);
1491 }
1492 assert(_temp_field_info->length() == length, "Must be");
1493
1494 int index = length;
1495 if (num_injected != 0) {
1496 for (int n = 0; n < num_injected; n++) {
1497 // Check for duplicates
1498 if (injected[n].may_be_java) {
1499 const Symbol* const name = injected[n].name();
1500 const Symbol* const signature = injected[n].signature();
1501 bool duplicate = false;
1502 for (int i = 0; i < length; i++) {
1503 const FieldInfo* const f = _temp_field_info->adr_at(i);
1504 if (name == cp->symbol_at(f->name_index()) &&
1505 signature == cp->symbol_at(f->signature_index())) {
1506 // Symbol is desclared in Java so skip this one
1507 duplicate = true;
1508 break;
1509 }
1510 }
1511 if (duplicate) {
1512 // These will be removed from the field array at the end
1513 continue;
1514 }
1515 }
1516
1517 // Injected field
1518 FieldInfo::FieldFlags fflags(0);
1519 fflags.update_injected(true);
1520 AccessFlags aflags;
1521 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1522 fi.set_index(index);
1523 _temp_field_info->append(fi);
1524 index++;
1525 }
1526 }
1527
1528 assert(_temp_field_info->length() == index, "Must be");
1529
1530 if (_need_verify && length > 1) {
1531 // Check duplicated fields
1532 ResourceMark rm(THREAD);
1533 // Set containing name-signature pairs
1534 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1535 for (int i = 0; i < _temp_field_info->length(); i++) {
1536 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1537 _temp_field_info->adr_at(i)->signature(_cp));
1538 // If no duplicates, add name/signature in hashtable names_and_sigs.
1539 if(!names_and_sigs->put(name_and_sig, 0)) {
1540 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1541 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1542 return;
1543 }
1544 }
1545 }
1546 }
1547
1548
1893 }
1894 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1895 if (_location != _in_field && _location != _in_class) {
1896 break; // only allow for fields and classes
1897 }
1898 if (!EnableContended || (RestrictContended && !privileged)) {
1899 break; // honor privileges
1900 }
1901 return _jdk_internal_vm_annotation_Contended;
1902 }
1903 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1904 if (_location != _in_method) break; // only allow for methods
1905 if (RestrictReservedStack && !privileged) break; // honor privileges
1906 return _jdk_internal_vm_annotation_ReservedStackAccess;
1907 }
1908 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1909 if (_location != _in_class) break; // only allow for classes
1910 if (!privileged) break; // only allow in privileged code
1911 return _jdk_internal_ValueBased;
1912 }
1913 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1914 return _java_lang_Deprecated;
1915 }
1916 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1917 if (_location != _in_class) break; // only allow for classes
1918 if (!privileged) break; // only allow in privileged code
1919 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1920 }
1921 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1922 if (_location != _in_method) break; // only allow for methods
1923 if (!privileged) break; // only allow in privileged code
1924 return _method_AOTRuntimeSetup;
1925 }
1926 default: {
1927 break;
1928 }
1929 }
1930 return AnnotationCollector::_unknown;
1931 }
1932
2173
2174 const u2 signature_index = cfs->get_u2_fast();
2175 guarantee_property(
2176 valid_symbol_at(signature_index),
2177 "Illegal constant pool index %u for method signature in class file %s",
2178 signature_index, CHECK_NULL);
2179 const Symbol* const signature = cp->symbol_at(signature_index);
2180
2181 if (name == vmSymbols::class_initializer_name()) {
2182 // We ignore the other access flags for a valid class initializer.
2183 // (JVM Spec 2nd ed., chapter 4.6)
2184 if (_major_version < 51) { // backward compatibility
2185 flags = JVM_ACC_STATIC;
2186 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2187 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2188 } else {
2189 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2190 return nullptr;
2191 }
2192 } else {
2193 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2194 }
2195
2196 if (name == vmSymbols::object_initializer_name() && is_interface) {
2197 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2198 return nullptr;
2199 }
2200
2201 int args_size = -1; // only used when _need_verify is true
2202 if (_need_verify) {
2203 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2204 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2205 verify_legal_method_signature(name, signature, CHECK_NULL);
2206 if (args_size > MAX_ARGS_SIZE) {
2207 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2208 return nullptr;
2209 }
2210 }
2211
2212 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2213
2214 // Default values for code and exceptions attribute elements
2215 u2 max_stack = 0;
2216 u2 max_locals = 0;
2217 u4 code_length = 0;
2218 const u1* code_start = nullptr;
2219 u2 exception_table_length = 0;
2220 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
3004 valid_klass_reference_at(outer_class_info_index),
3005 "outer_class_info_index %u has bad constant type in class file %s",
3006 outer_class_info_index, CHECK_0);
3007
3008 if (outer_class_info_index != 0) {
3009 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3010 char* bytes = (char*)outer_class_name->bytes();
3011 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3012 "Outer class is an array class in class file %s", CHECK_0);
3013 }
3014 // Inner class name
3015 const u2 inner_name_index = cfs->get_u2_fast();
3016 guarantee_property(
3017 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3018 "inner_name_index %u has bad constant type in class file %s",
3019 inner_name_index, CHECK_0);
3020 if (_need_verify) {
3021 guarantee_property(inner_class_info_index != outer_class_info_index,
3022 "Class is both outer and inner class in class file %s", CHECK_0);
3023 }
3024 // Access flags
3025 u2 flags;
3026 // JVM_ACC_MODULE is defined in JDK-9 and later.
3027 if (_major_version >= JAVA_9_VERSION) {
3028 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3029 } else {
3030 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3031 }
3032 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3033 // Set abstract bit for old class files for backward compatibility
3034 flags |= JVM_ACC_ABSTRACT;
3035 }
3036
3037 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3038 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3039 AccessFlags inner_access_flags(flags);
3040
3041 inner_classes->at_put(index++, inner_class_info_index);
3042 inner_classes->at_put(index++, outer_class_info_index);
3043 inner_classes->at_put(index++, inner_name_index);
3044 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3045 }
3046
3047 // Check for circular and duplicate entries.
3048 bool has_circularity = false;
3049 if (_need_verify) {
3050 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3051 if (has_circularity) {
3052 // If circularity check failed then ignore InnerClasses attribute.
3053 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3054 index = 0;
3055 if (parsed_enclosingmethod_attribute) {
3056 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3122 if (length > 0) {
3123 int index = 0;
3124 cfs->guarantee_more(2 * length, CHECK_0);
3125 for (int n = 0; n < length; n++) {
3126 const u2 class_info_index = cfs->get_u2_fast();
3127 guarantee_property(
3128 valid_klass_reference_at(class_info_index),
3129 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3130 class_info_index, CHECK_0);
3131 permitted_subclasses->at_put(index++, class_info_index);
3132 }
3133 assert(index == size, "wrong size");
3134 }
3135
3136 // Restore buffer's current position.
3137 cfs->set_current(current_mark);
3138
3139 return length;
3140 }
3141
3142 // Record {
3143 // u2 attribute_name_index;
3144 // u4 attribute_length;
3145 // u2 components_count;
3146 // component_info components[components_count];
3147 // }
3148 // component_info {
3149 // u2 name_index;
3150 // u2 descriptor_index
3151 // u2 attributes_count;
3152 // attribute_info_attributes[attributes_count];
3153 // }
3154 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3155 const ConstantPool* cp,
3156 const u1* const record_attribute_start,
3157 TRAPS) {
3158 const u1* const current_mark = cfs->current();
3159 int components_count = 0;
3160 unsigned int calculate_attr_size = 0;
3161 if (record_attribute_start != nullptr) {
3372 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3373 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3374 "Bad length on BootstrapMethods in class file %s",
3375 CHECK);
3376 }
3377
3378 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3379 ConstantPool* cp,
3380 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3381 TRAPS) {
3382 assert(cfs != nullptr, "invariant");
3383 assert(cp != nullptr, "invariant");
3384 assert(parsed_annotations != nullptr, "invariant");
3385
3386 // Set inner classes attribute to default sentinel
3387 _inner_classes = Universe::the_empty_short_array();
3388 // Set nest members attribute to default sentinel
3389 _nest_members = Universe::the_empty_short_array();
3390 // Set _permitted_subclasses attribute to default sentinel
3391 _permitted_subclasses = Universe::the_empty_short_array();
3392 cfs->guarantee_more(2, CHECK); // attributes_count
3393 u2 attributes_count = cfs->get_u2_fast();
3394 bool parsed_sourcefile_attribute = false;
3395 bool parsed_innerclasses_attribute = false;
3396 bool parsed_nest_members_attribute = false;
3397 bool parsed_permitted_subclasses_attribute = false;
3398 bool parsed_nest_host_attribute = false;
3399 bool parsed_record_attribute = false;
3400 bool parsed_enclosingmethod_attribute = false;
3401 bool parsed_bootstrap_methods_attribute = false;
3402 const u1* runtime_visible_annotations = nullptr;
3403 int runtime_visible_annotations_length = 0;
3404 const u1* runtime_visible_type_annotations = nullptr;
3405 int runtime_visible_type_annotations_length = 0;
3406 bool runtime_invisible_type_annotations_exists = false;
3407 bool runtime_invisible_annotations_exists = false;
3408 bool parsed_source_debug_ext_annotations_exist = false;
3409 const u1* inner_classes_attribute_start = nullptr;
3410 u4 inner_classes_attribute_length = 0;
3411 u2 enclosing_method_class_index = 0;
3412 u2 enclosing_method_method_index = 0;
3413 const u1* nest_members_attribute_start = nullptr;
3414 u4 nest_members_attribute_length = 0;
3415 const u1* record_attribute_start = nullptr;
3416 u4 record_attribute_length = 0;
3417 const u1* permitted_subclasses_attribute_start = nullptr;
3418 u4 permitted_subclasses_attribute_length = 0;
3419
3420 // Iterate over attributes
3421 while (attributes_count--) {
3422 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3423 const u2 attribute_name_index = cfs->get_u2_fast();
3424 const u4 attribute_length = cfs->get_u4_fast();
3425 guarantee_property(
3426 valid_symbol_at(attribute_name_index),
3427 "Attribute name has bad constant pool index %u in class file %s",
3428 attribute_name_index, CHECK);
3429 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3430 if (tag == vmSymbols::tag_source_file()) {
3431 // Check for SourceFile tag
3432 if (_need_verify) {
3433 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3434 }
3435 if (parsed_sourcefile_attribute) {
3436 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3437 return;
3438 } else {
3614 return;
3615 }
3616 parsed_record_attribute = true;
3617 record_attribute_start = cfs->current();
3618 record_attribute_length = attribute_length;
3619 } else if (_major_version >= JAVA_17_VERSION) {
3620 if (tag == vmSymbols::tag_permitted_subclasses()) {
3621 if (parsed_permitted_subclasses_attribute) {
3622 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3623 return;
3624 }
3625 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3626 if (_access_flags.is_final()) {
3627 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3628 return;
3629 }
3630 parsed_permitted_subclasses_attribute = true;
3631 permitted_subclasses_attribute_start = cfs->current();
3632 permitted_subclasses_attribute_length = attribute_length;
3633 }
3634 }
3635 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3636 cfs->skip_u1(attribute_length, CHECK);
3637 } else {
3638 // Unknown attribute
3639 cfs->skip_u1(attribute_length, CHECK);
3640 }
3641 } else {
3642 // Unknown attribute
3643 cfs->skip_u1(attribute_length, CHECK);
3644 }
3645 } else {
3646 // Unknown attribute
3647 cfs->skip_u1(attribute_length, CHECK);
3648 }
3649 }
3650 _class_annotations = allocate_annotations(runtime_visible_annotations,
3651 runtime_visible_annotations_length,
3652 CHECK);
3653 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3690 CHECK);
3691 if (_need_verify) {
3692 guarantee_property(record_attribute_length == calculated_attr_length,
3693 "Record attribute has wrong length in class file %s",
3694 CHECK);
3695 }
3696 }
3697
3698 if (parsed_permitted_subclasses_attribute) {
3699 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3700 cfs,
3701 permitted_subclasses_attribute_start,
3702 CHECK);
3703 if (_need_verify) {
3704 guarantee_property(
3705 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3706 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3707 }
3708 }
3709
3710 if (_max_bootstrap_specifier_index >= 0) {
3711 guarantee_property(parsed_bootstrap_methods_attribute,
3712 "Missing BootstrapMethods attribute in class file %s", CHECK);
3713 }
3714 }
3715
3716 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3717 assert(k != nullptr, "invariant");
3718
3719 if (_synthetic_flag)
3720 k->set_is_synthetic();
3721 if (_sourcefile_index != 0) {
3722 k->set_source_file_name_index(_sourcefile_index);
3723 }
3724 if (_generic_signature_index != 0) {
3725 k->set_generic_signature_index(_generic_signature_index);
3726 }
3727 if (_sde_buffer != nullptr) {
3728 k->set_source_debug_extension(_sde_buffer, _sde_length);
3729 }
3756 _class_type_annotations = nullptr;
3757 _fields_annotations = nullptr;
3758 _fields_type_annotations = nullptr;
3759 }
3760
3761 // Transfer ownership of metadata allocated to the InstanceKlass.
3762 void ClassFileParser::apply_parsed_class_metadata(
3763 InstanceKlass* this_klass,
3764 int java_fields_count) {
3765 assert(this_klass != nullptr, "invariant");
3766
3767 _cp->set_pool_holder(this_klass);
3768 this_klass->set_constants(_cp);
3769 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3770 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3771 this_klass->set_fields_status(_fields_status);
3772 this_klass->set_methods(_methods);
3773 this_klass->set_inner_classes(_inner_classes);
3774 this_klass->set_nest_members(_nest_members);
3775 this_klass->set_nest_host_index(_nest_host);
3776 this_klass->set_annotations(_combined_annotations);
3777 this_klass->set_permitted_subclasses(_permitted_subclasses);
3778 this_klass->set_record_components(_record_components);
3779
3780 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3781
3782 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3783 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3784 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3785 // its _super. If an OOM occurs while loading the current klass, its _super field
3786 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3787 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3788 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3789
3790 // Clear out these fields so they don't get deallocated by the destructor
3791 clear_class_metadata();
3792 }
3793
3794 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3795 int anno_length,
3796 TRAPS) {
3797 AnnotationArray* annotations = nullptr;
3798 if (anno != nullptr) {
3799 annotations = MetadataFactory::new_array<u1>(_loader_data,
3800 anno_length,
3801 CHECK_(annotations));
3802 for (int i = 0; i < anno_length; i++) {
3803 annotations->at_put(i, anno[i]);
3804 }
3805 }
3806 return annotations;
3807 }
3808
3809 void ClassFileParser::check_super_class(ConstantPool* const cp,
3810 const int super_class_index,
3811 const bool need_verify,
3812 TRAPS) {
3813 assert(cp != nullptr, "invariant");
3814
3815 if (super_class_index == 0) {
3816 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3817 "Invalid superclass index %u in class file %s",
3818 super_class_index,
3819 CHECK);
3820 } else {
3821 guarantee_property(valid_klass_reference_at(super_class_index),
3822 "Invalid superclass index %u in class file %s",
3823 super_class_index,
3824 CHECK);
3825
3826 // The class name should be legal because it is checked when parsing constant pool.
3827 // However, make sure it is not an array type.
3828 if (need_verify) {
3829 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3830 "Bad superclass name in class file %s", CHECK);
3831 }
3832 }
3833 }
3834
3835 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3836 _max_nonstatic_oop_maps = max_blocks;
3837 _nonstatic_oop_map_count = 0;
3838 if (max_blocks == 0) {
3990 // See documentation of InstanceKlass::can_be_fastpath_allocated().
3991 assert(ik->size_helper() > 0, "layout_helper is initialized");
3992 if (ik->is_abstract() || ik->is_interface()
3993 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3994 || ik->size_helper() >= FastAllocateSizeLimit) {
3995 // Forbid fast-path allocation.
3996 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3997 ik->set_layout_helper(lh);
3998 }
3999
4000 // Propagate the AOT runtimeSetup method discovery
4001 if (_has_aot_runtime_setup_method) {
4002 ik->set_is_runtime_setup_required();
4003 if (log_is_enabled(Info, aot, init)) {
4004 ResourceMark rm;
4005 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4006 }
4007 }
4008 }
4009
4010 // utility methods for appending an array with check for duplicates
4011
4012 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4013 const Array<InstanceKlass*>* const ifs) {
4014 // iterate over new interfaces
4015 for (int i = 0; i < ifs->length(); i++) {
4016 InstanceKlass* const e = ifs->at(i);
4017 assert(e->is_klass() && e->is_interface(), "just checking");
4018 // add new interface
4019 result->append_if_missing(e);
4020 }
4021 }
4022
4023 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4024 Array<InstanceKlass*>* local_ifs,
4025 ClassLoaderData* loader_data,
4026 TRAPS) {
4027 assert(local_ifs != nullptr, "invariant");
4028 assert(loader_data != nullptr, "invariant");
4029
4056 } else {
4057 ResourceMark rm;
4058 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4059
4060 // Copy down from superclass
4061 if (super != nullptr) {
4062 append_interfaces(result, super->transitive_interfaces());
4063 }
4064
4065 // Copy down from local interfaces' superinterfaces
4066 for (int i = 0; i < local_size; i++) {
4067 InstanceKlass* const l = local_ifs->at(i);
4068 append_interfaces(result, l->transitive_interfaces());
4069 }
4070 // Finally add local interfaces
4071 append_interfaces(result, local_ifs);
4072
4073 // length will be less than the max_transitive_size if duplicates were removed
4074 const int length = result->length();
4075 assert(length <= max_transitive_size, "just checking");
4076 Array<InstanceKlass*>* const new_result =
4077 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4078 for (int i = 0; i < length; i++) {
4079 InstanceKlass* const e = result->at(i);
4080 assert(e != nullptr, "just checking");
4081 new_result->at_put(i, e);
4082 }
4083 return new_result;
4084 }
4085 }
4086
4087 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4088 assert(this_klass != nullptr, "invariant");
4089 const InstanceKlass* const super = this_klass->super();
4090
4091 if (super != nullptr) {
4092 if (super->is_final()) {
4093 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4094 return;
4095 }
4096
4097 if (super->is_sealed()) {
4098 stringStream ss;
4099 ResourceMark rm(THREAD);
4100 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4101 classfile_icce_error(ss.as_string(), THREAD);
4102 return;
4103 }
4104 }
4105
4106 Reflection::VerifyClassAccessResults vca_result =
4107 Reflection::verify_class_access(this_klass, super, false);
4108 if (vca_result != Reflection::ACCESS_OK) {
4109 ResourceMark rm(THREAD);
4110 char* msg = Reflection::verify_class_access_msg(this_klass,
4111 super,
4112 vca_result);
4113
4114 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4115 if (msg == nullptr) {
4116 bool same_module = (this_klass->module() == super->module());
4117 Exceptions::fthrow(
4118 THREAD_AND_LOCATION,
4119 vmSymbols::java_lang_IllegalAccessError(),
4120 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4121 this_klass->external_name(),
4122 super->is_abstract() ? "abstract " : "",
4123 super->external_name(),
4124 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4125 (same_module) ? "" : "; ",
4278 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4279 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4280 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4281 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4282 if (is_module) {
4283 ResourceMark rm(THREAD);
4284 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4285 Exceptions::fthrow(
4286 THREAD_AND_LOCATION,
4287 vmSymbols::java_lang_NoClassDefFoundError(),
4288 "%s is not a class because access_flag ACC_MODULE is set",
4289 _class_name->as_C_string());
4290 return;
4291 }
4292
4293 if (!_need_verify) { return; }
4294
4295 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4296 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4297 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4298 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4299 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4300 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4301 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4302
4303 if ((is_abstract && is_final) ||
4304 (is_interface && !is_abstract) ||
4305 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4306 (!is_interface && major_gte_1_5 && is_annotation)) {
4307 ResourceMark rm(THREAD);
4308 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4309 if (inner_name == nullptr && !is_anonymous_inner_class) {
4310 Exceptions::fthrow(
4311 THREAD_AND_LOCATION,
4312 vmSymbols::java_lang_ClassFormatError(),
4313 "Illegal class modifiers in class %s: 0x%X",
4314 _class_name->as_C_string(), flags
4315 );
4316 } else {
4317 if (is_anonymous_inner_class) {
4318 Exceptions::fthrow(
4319 THREAD_AND_LOCATION,
4320 vmSymbols::java_lang_ClassFormatError(),
4321 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4322 _class_name->as_C_string(), flags
4323 );
4324 } else {
4325 Exceptions::fthrow(
4326 THREAD_AND_LOCATION,
4381 THREAD_AND_LOCATION,
4382 vmSymbols::java_lang_UnsupportedClassVersionError(),
4383 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4384 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4385 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4386 return;
4387 }
4388
4389 if (!Arguments::enable_preview()) {
4390 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4391 class_name, major, minor, THREAD);
4392 return;
4393 }
4394
4395 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4396 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4397 class_name, major, minor, THREAD);
4398 }
4399 }
4400
4401 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4402 bool is_interface,
4403 TRAPS) const {
4404 if (!_need_verify) { return; }
4405
4406 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4407 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4408 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4409 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4410 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4411 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4412 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4413 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4414 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4415
4416 bool is_illegal = false;
4417
4418 if (is_interface) {
4419 if (!is_public || !is_static || !is_final || is_private ||
4420 is_protected || is_volatile || is_transient ||
4421 (major_gte_1_5 && is_enum)) {
4422 is_illegal = true;
4423 }
4424 } else { // not interface
4425 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4426 is_illegal = true;
4427 }
4428 }
4429
4430 if (is_illegal) {
4431 ResourceMark rm(THREAD);
4432 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4433 Exceptions::fthrow(
4434 THREAD_AND_LOCATION,
4435 vmSymbols::java_lang_ClassFormatError(),
4436 "Illegal field modifiers in class %s: 0x%X",
4437 _class_name->as_C_string(), flags);
4438 return;
4439 }
4440 }
4441
4442 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4443 bool is_interface,
4444 const Symbol* name,
4445 TRAPS) const {
4446 if (!_need_verify) { return; }
4447
4448 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4449 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4450 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4451 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4452 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4453 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4454 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4455 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4456 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4457 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4458 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4459 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4460 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4461 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4462
4463 bool is_illegal = false;
4464
4465 if (is_interface) {
4466 if (major_gte_8) {
4467 // Class file version is JAVA_8_VERSION or later Methods of
4468 // interfaces may set any of the flags except ACC_PROTECTED,
4469 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4470 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4471 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4472 (is_native || is_protected || is_final || is_synchronized) ||
4473 // If a specific method of a class or interface has its
4474 // ACC_ABSTRACT flag set, it must not have any of its
4475 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4476 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4477 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4478 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4479 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4480 is_illegal = true;
4481 }
4482 } else if (major_gte_1_5) {
4483 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4484 if (!is_public || is_private || is_protected || is_static || is_final ||
4485 is_synchronized || is_native || !is_abstract || is_strict) {
4486 is_illegal = true;
4487 }
4488 } else {
4489 // Class file version is pre-JAVA_1_5_VERSION
4490 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4491 is_illegal = true;
4492 }
4493 }
4494 } else { // not interface
4495 if (has_illegal_visibility(flags)) {
4496 is_illegal = true;
4497 } else {
4498 if (is_initializer) {
4499 if (is_static || is_final || is_synchronized || is_native ||
4500 is_abstract || (major_gte_1_5 && is_bridge)) {
4501 is_illegal = true;
4502 }
4503 } else { // not initializer
4504 if (is_abstract) {
4505 if ((is_final || is_native || is_private || is_static ||
4506 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4507 is_illegal = true;
4508 }
4509 }
4510 }
4511 }
4512 }
4513
4514 if (is_illegal) {
4515 ResourceMark rm(THREAD);
4516 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4517 Exceptions::fthrow(
4518 THREAD_AND_LOCATION,
4519 vmSymbols::java_lang_ClassFormatError(),
4520 "Method %s in class %s has illegal modifiers: 0x%X",
4521 name->as_C_string(), _class_name->as_C_string(), flags);
4522 return;
4523 }
4524 }
4525
4526 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4527 int length,
4528 TRAPS) const {
4529 assert(_need_verify, "only called when _need_verify is true");
4530 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4531 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4532 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4533 }
4534 }
4535
4536 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4537 // In class names, '/' separates unqualified names. This is verified in this function also.
4538 // Method names also may not contain the characters '<' or '>', unless <init>
4539 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4540 // method. Because these names have been checked as special cases before
4541 // calling this method in verify_legal_method_name.
4559 if (type == ClassFileParser::LegalClass) {
4560 if (p == name || p+1 >= name+length ||
4561 *(p+1) == JVM_SIGNATURE_SLASH) {
4562 return false;
4563 }
4564 } else {
4565 return false; // do not permit '/' unless it's class name
4566 }
4567 break;
4568 case JVM_SIGNATURE_SPECIAL:
4569 case JVM_SIGNATURE_ENDSPECIAL:
4570 // do not permit '<' or '>' in method names
4571 if (type == ClassFileParser::LegalMethod) {
4572 return false;
4573 }
4574 }
4575 }
4576 return true;
4577 }
4578
4579 // Take pointer to a UTF8 byte string (not NUL-terminated).
4580 // Skip over the longest part of the string that could
4581 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4582 // Return a pointer to just past the fieldname.
4583 // Return null if no fieldname at all was found, or in the case of slash_ok
4584 // being true, we saw consecutive slashes (meaning we were looking for a
4585 // qualified path but found something that was badly-formed).
4586 static const char* skip_over_field_name(const char* const name,
4587 bool slash_ok,
4588 unsigned int length) {
4589 const char* p;
4590 jboolean last_is_slash = false;
4591 jboolean not_first_ch = false;
4592
4593 for (p = name; p != name + length; not_first_ch = true) {
4594 const char* old_p = p;
4595 jchar ch = *p;
4596 if (ch < 128) {
4597 p++;
4598 // quick check for ascii
4660 // be taken as a field signature. Allow "void" if void_ok.
4661 // Return a pointer to just past the signature.
4662 // Return null if no legal signature is found.
4663 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4664 bool void_ok,
4665 unsigned int length,
4666 TRAPS) const {
4667 unsigned int array_dim = 0;
4668 while (length > 0) {
4669 switch (signature[0]) {
4670 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4671 case JVM_SIGNATURE_BOOLEAN:
4672 case JVM_SIGNATURE_BYTE:
4673 case JVM_SIGNATURE_CHAR:
4674 case JVM_SIGNATURE_SHORT:
4675 case JVM_SIGNATURE_INT:
4676 case JVM_SIGNATURE_FLOAT:
4677 case JVM_SIGNATURE_LONG:
4678 case JVM_SIGNATURE_DOUBLE:
4679 return signature + 1;
4680 case JVM_SIGNATURE_CLASS: {
4681 if (_major_version < JAVA_1_5_VERSION) {
4682 signature++;
4683 length--;
4684 // Skip over the class name if one is there
4685 const char* const p = skip_over_field_name(signature, true, length);
4686 assert(p == nullptr || p > signature, "must parse one character at least");
4687 // The next character better be a semicolon
4688 if (p != nullptr && // Parse of field name succeeded.
4689 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4690 p[0] == JVM_SIGNATURE_ENDCLASS) {
4691 return p + 1;
4692 }
4693 }
4694 else {
4695 // Skip leading 'L' and ignore first appearance of ';'
4696 signature++;
4697 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4698 // Format check signature
4699 if (c != nullptr) {
4700 int newlen = pointer_delta_as_int(c, (char*) signature);
4825 } else {
4826 // 4881221: relax the constraints based on JSR202 spec
4827 legal = verify_unqualified_name(bytes, length, LegalMethod);
4828 }
4829 }
4830
4831 if (!legal) {
4832 ResourceMark rm(THREAD);
4833 assert(_class_name != nullptr, "invariant");
4834 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4835 Exceptions::fthrow(
4836 THREAD_AND_LOCATION,
4837 vmSymbols::java_lang_ClassFormatError(),
4838 "Illegal method name \"%.*s\" in class %s", length, bytes,
4839 _class_name->as_C_string()
4840 );
4841 return;
4842 }
4843 }
4844
4845
4846 // Checks if signature is a legal field signature.
4847 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4848 const Symbol* signature,
4849 TRAPS) const {
4850 if (!_need_verify) { return; }
4851
4852 const char* const bytes = (const char*)signature->bytes();
4853 const unsigned int length = signature->utf8_length();
4854 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4855
4856 if (p == nullptr || (p - bytes) != (int)length) {
4857 throwIllegalSignature("Field", name, signature, CHECK);
4858 }
4859 }
4860
4861 // Check that the signature is compatible with the method name. For example,
4862 // check that <init> has a void signature.
4863 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4864 const Symbol* signature,
4865 TRAPS) const {
4866 if (!_need_verify) {
4867 return;
4868 }
4869
4870 // Class initializers cannot have args for class format version >= 51.
4871 if (name == vmSymbols::class_initializer_name() &&
4872 signature != vmSymbols::void_method_signature() &&
4873 _major_version >= JAVA_7_VERSION) {
4874 throwIllegalSignature("Method", name, signature, THREAD);
4875 return;
4876 }
4913 length -= pointer_delta_as_int(nextp, p);
4914 p = nextp;
4915 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4916 }
4917 // The first non-signature thing better be a ')'
4918 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4919 length--;
4920 // Now we better just have a return value
4921 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4922 if (nextp && ((int)length == (nextp - p))) {
4923 return args_size;
4924 }
4925 }
4926 }
4927 // Report error
4928 throwIllegalSignature("Method", name, signature, THREAD);
4929 return 0;
4930 }
4931
4932 int ClassFileParser::static_field_size() const {
4933 assert(_field_info != nullptr, "invariant");
4934 return _field_info->_static_field_size;
4935 }
4936
4937 int ClassFileParser::total_oop_map_count() const {
4938 assert(_field_info != nullptr, "invariant");
4939 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4940 }
4941
4942 jint ClassFileParser::layout_size() const {
4943 assert(_field_info != nullptr, "invariant");
4944 return _field_info->_instance_size;
4945 }
4946
4947 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4948 const Array<Method*>* methods) {
4949 assert(ik != nullptr, "invariant");
4950 assert(methods != nullptr, "invariant");
4951
4952 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4953 // (We used to do this lazily, but now we query it in Rewriter,
4954 // which is eagerly done for every method, so we might as well do it now,
4955 // when everything is fresh in memory.)
4956 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4957
4958 if (klass_id != vmSymbolID::NO_SID) {
4959 for (int j = 0; j < methods->length(); ++j) {
4960 Method* method = methods->at(j);
4961 method->init_intrinsic_id(klass_id);
4962
4963 if (CheckIntrinsics) {
4964 // Check if an intrinsic is defined for method 'method',
5039 }
5040 }
5041
5042 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5043 const ClassInstanceInfo& cl_inst_info,
5044 TRAPS) {
5045 if (_klass != nullptr) {
5046 return _klass;
5047 }
5048
5049 InstanceKlass* const ik =
5050 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5051
5052 if (is_hidden()) {
5053 mangle_hidden_class_name(ik);
5054 }
5055
5056 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5057
5058 assert(_klass == ik, "invariant");
5059
5060 return ik;
5061 }
5062
5063 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5064 bool changed_by_loadhook,
5065 const ClassInstanceInfo& cl_inst_info,
5066 TRAPS) {
5067 assert(ik != nullptr, "invariant");
5068
5069 // Set name and CLD before adding to CLD
5070 ik->set_class_loader_data(_loader_data);
5071 ik->set_class_loader_type();
5072 ik->set_name(_class_name);
5073
5074 // Add all classes to our internal class loader list here,
5075 // including classes in the bootstrap (null) class loader.
5076 const bool publicize = !is_internal();
5077
5078 _loader_data->add_class(ik, publicize);
5079
5080 set_klass_to_deallocate(ik);
5081
5082 assert(_field_info != nullptr, "invariant");
5083 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5084 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5085 "sanity");
5086
5087 assert(ik->is_instance_klass(), "sanity");
5088 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5089
5090 // Fill in information already parsed
5091 ik->set_should_verify_class(_need_verify);
5092
5093 // Not yet: supers are done below to support the new subtype-checking fields
5094 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5095 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5096 ik->set_static_oop_field_count(_static_oop_count);
5097
5098 // this transfers ownership of a lot of arrays from
5099 // the parser onto the InstanceKlass*
5100 apply_parsed_class_metadata(ik, _java_fields_count);
5101
5102 // can only set dynamic nest-host after static nest information is set
5103 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5104 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5105 }
5106
5107 // note that is not safe to use the fields in the parser from this point on
5108 assert(nullptr == _cp, "invariant");
5109 assert(nullptr == _fieldinfo_stream, "invariant");
5110 assert(nullptr == _fieldinfo_search_table, "invariant");
5111 assert(nullptr == _fields_status, "invariant");
5112 assert(nullptr == _methods, "invariant");
5113 assert(nullptr == _inner_classes, "invariant");
5114 assert(nullptr == _nest_members, "invariant");
5115 assert(nullptr == _combined_annotations, "invariant");
5116 assert(nullptr == _record_components, "invariant");
5117 assert(nullptr == _permitted_subclasses, "invariant");
5118
5119 if (_has_localvariable_table) {
5120 ik->set_has_localvariable_table(true);
5121 }
5122
5123 if (_has_final_method) {
5124 ik->set_has_final_method();
5125 }
5126
5127 ik->copy_method_ordering(_method_ordering, CHECK);
5128 // The InstanceKlass::_methods_jmethod_ids cache
5129 // is managed on the assumption that the initial cache
5130 // size is equal to the number of methods in the class. If
5131 // that changes, then InstanceKlass::idnum_can_increment()
5132 // has to be changed accordingly.
5133 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5134
5135 ik->set_this_class_index(_this_class_index);
5136
5137 if (_is_hidden) {
5174 if ((_num_miranda_methods > 0) ||
5175 // if this class introduced new miranda methods or
5176 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5177 // super class exists and this class inherited miranda methods
5178 ) {
5179 ik->set_has_miranda_methods(); // then set a flag
5180 }
5181
5182 // Fill in information needed to compute superclasses.
5183 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5184 ik->set_transitive_interfaces(_transitive_interfaces);
5185 ik->set_local_interfaces(_local_interfaces);
5186 _transitive_interfaces = nullptr;
5187 _local_interfaces = nullptr;
5188
5189 // Initialize itable offset tables
5190 klassItable::setup_itable_offset_table(ik);
5191
5192 // Compute transitive closure of interfaces this class implements
5193 // Do final class setup
5194 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5195 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5196 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5197 }
5198
5199 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5200 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5201 ik->set_has_contended_annotations(true);
5202 }
5203
5204 // Fill in has_finalizer and layout_helper
5205 set_precomputed_flags(ik);
5206
5207 // check if this class can access its super class
5208 check_super_class_access(ik, CHECK);
5209
5210 // check if this class can access its superinterfaces
5211 check_super_interface_access(ik, CHECK);
5212
5213 // check if this class overrides any final method
5214 check_final_method_override(ik, CHECK);
5235
5236 assert(_all_mirandas != nullptr, "invariant");
5237
5238 // Generate any default methods - default methods are public interface methods
5239 // that have a default implementation. This is new with Java 8.
5240 if (_has_nonstatic_concrete_methods) {
5241 DefaultMethods::generate_default_methods(ik,
5242 _all_mirandas,
5243 CHECK);
5244 }
5245
5246 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5247 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5248 !module_entry->has_default_read_edges()) {
5249 if (!module_entry->set_has_default_read_edges()) {
5250 // We won a potential race
5251 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5252 }
5253 }
5254
5255 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5256
5257 if (!is_internal()) {
5258 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5259
5260 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5261 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5262 log_is_enabled(Info, class, preview)) {
5263 ResourceMark rm;
5264 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5265 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5266 }
5267
5268 if (log_is_enabled(Debug, class, resolve)) {
5269 ResourceMark rm;
5270 // print out the superclass.
5271 const char * from = ik->external_name();
5272 if (ik->super() != nullptr) {
5273 log_debug(class, resolve)("%s %s (super)",
5274 from,
5315 const ClassLoadInfo* cl_info,
5316 Publicity pub_level,
5317 TRAPS) :
5318 _stream(stream),
5319 _class_name(nullptr),
5320 _loader_data(loader_data),
5321 _is_hidden(cl_info->is_hidden()),
5322 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5323 _orig_cp_size(0),
5324 _static_oop_count(0),
5325 _super_klass(),
5326 _cp(nullptr),
5327 _fieldinfo_stream(nullptr),
5328 _fieldinfo_search_table(nullptr),
5329 _fields_status(nullptr),
5330 _methods(nullptr),
5331 _inner_classes(nullptr),
5332 _nest_members(nullptr),
5333 _nest_host(0),
5334 _permitted_subclasses(nullptr),
5335 _record_components(nullptr),
5336 _local_interfaces(nullptr),
5337 _transitive_interfaces(nullptr),
5338 _combined_annotations(nullptr),
5339 _class_annotations(nullptr),
5340 _class_type_annotations(nullptr),
5341 _fields_annotations(nullptr),
5342 _fields_type_annotations(nullptr),
5343 _klass(nullptr),
5344 _klass_to_deallocate(nullptr),
5345 _parsed_annotations(nullptr),
5346 _field_info(nullptr),
5347 _temp_field_info(nullptr),
5348 _method_ordering(nullptr),
5349 _all_mirandas(nullptr),
5350 _vtable_size(0),
5351 _itable_size(0),
5352 _num_miranda_methods(0),
5353 _protection_domain(cl_info->protection_domain()),
5354 _access_flags(),
5355 _pub_level(pub_level),
5356 _bad_constant_seen(0),
5357 _synthetic_flag(false),
5358 _sde_length(false),
5359 _sde_buffer(nullptr),
5360 _sourcefile_index(0),
5361 _generic_signature_index(0),
5362 _major_version(0),
5363 _minor_version(0),
5364 _this_class_index(0),
5365 _super_class_index(0),
5366 _itfs_len(0),
5367 _java_fields_count(0),
5368 _need_verify(false),
5369 _has_nonstatic_concrete_methods(false),
5370 _declares_nonstatic_concrete_methods(false),
5371 _has_localvariable_table(false),
5372 _has_final_method(false),
5373 _has_contended_fields(false),
5374 _has_aot_runtime_setup_method(false),
5375 _has_finalizer(false),
5376 _has_empty_finalizer(false),
5377 _max_bootstrap_specifier_index(-1) {
5378
5379 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5380 _class_name->increment_refcount();
5381
5382 assert(_loader_data != nullptr, "invariant");
5383 assert(stream != nullptr, "invariant");
5384 assert(_stream != nullptr, "invariant");
5385 assert(_stream->buffer() == _stream->current(), "invariant");
5386 assert(_class_name != nullptr, "invariant");
5387 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5388
5389 // Figure out whether we can skip format checking (matching classic VM behavior)
5390 // Always verify CFLH bytes from the user agents.
5391 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5392
5393 // synch back verification state to stream to check for truncation.
5394 stream->set_need_verify(_need_verify);
5395
5396 parse_stream(stream, CHECK);
5397
5398 post_process_parsed_stream(stream, _cp, CHECK);
5399 }
5400
5401 void ClassFileParser::clear_class_metadata() {
5402 // metadata created before the instance klass is created. Must be
5403 // deallocated if classfile parsing returns an error.
5404 _cp = nullptr;
5405 _fieldinfo_stream = nullptr;
5406 _fieldinfo_search_table = nullptr;
5407 _fields_status = nullptr;
5408 _methods = nullptr;
5409 _inner_classes = nullptr;
5410 _nest_members = nullptr;
5411 _permitted_subclasses = nullptr;
5412 _combined_annotations = nullptr;
5413 _class_annotations = _class_type_annotations = nullptr;
5414 _fields_annotations = _fields_type_annotations = nullptr;
5415 _record_components = nullptr;
5416 }
5417
5418 // Destructor to clean up
5419 ClassFileParser::~ClassFileParser() {
5420 _class_name->decrement_refcount();
5421
5422 if (_cp != nullptr) {
5423 MetadataFactory::free_metadata(_loader_data, _cp);
5424 }
5425
5426 if (_fieldinfo_stream != nullptr) {
5427 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5428 }
5429 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5430
5431 if (_fields_status != nullptr) {
5432 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5433 }
5434
5435 if (_methods != nullptr) {
5436 // Free methods
5437 InstanceKlass::deallocate_methods(_loader_data, _methods);
5438 }
5439
5440 // beware of the Universe::empty_blah_array!!
5441 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5442 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5443 }
5444
5445 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5446 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5447 }
5448
5449 if (_record_components != nullptr) {
5450 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5451 }
5452
5453 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5454 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5455 }
5456
5457 // Free interfaces
5458 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5459 _local_interfaces, _transitive_interfaces);
5460
5461 if (_combined_annotations != nullptr) {
5462 // After all annotations arrays have been created, they are installed into the
5463 // Annotations object that will be assigned to the InstanceKlass being created.
5464
5465 // Deallocate the Annotations object and the installed annotations arrays.
5466 _combined_annotations->deallocate_contents(_loader_data);
5467
5468 // If the _combined_annotations pointer is non-null,
5469 // then the other annotations fields should have been cleared.
5470 assert(_class_annotations == nullptr, "Should have been cleared");
5471 assert(_class_type_annotations == nullptr, "Should have been cleared");
5472 assert(_fields_annotations == nullptr, "Should have been cleared");
5473 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5474 } else {
5475 // If the annotations arrays were not installed into the Annotations object,
5476 // then they have to be deallocated explicitly.
5536
5537 assert(cp_size == (u2)cp->length(), "invariant");
5538
5539 // ACCESS FLAGS
5540 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5541
5542 // Access flags
5543 u2 flags;
5544 // JVM_ACC_MODULE is defined in JDK-9 and later.
5545 if (_major_version >= JAVA_9_VERSION) {
5546 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5547 } else {
5548 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5549 }
5550
5551 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5552 // Set abstract bit for old class files for backward compatibility
5553 flags |= JVM_ACC_ABSTRACT;
5554 }
5555
5556 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5557
5558 short bad_constant = class_bad_constant_seen();
5559 if (bad_constant != 0) {
5560 // Do not throw CFE until after the access_flags are checked because if
5561 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5562 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5563 return;
5564 }
5565
5566 _access_flags.set_flags(flags);
5567
5568 // This class and superclass
5569 _this_class_index = stream->get_u2_fast();
5570 guarantee_property(
5571 valid_cp_range(_this_class_index, cp_size) &&
5572 cp->tag_at(_this_class_index).is_unresolved_klass(),
5573 "Invalid this class index %u in constant pool in class file %s",
5574 _this_class_index, CHECK);
5575
5643
5644 // SUPERKLASS
5645 _super_class_index = stream->get_u2_fast();
5646 check_super_class(cp,
5647 _super_class_index,
5648 _need_verify,
5649 CHECK);
5650
5651 // Interfaces
5652 _itfs_len = stream->get_u2_fast();
5653 parse_interfaces(stream,
5654 _itfs_len,
5655 cp,
5656 &_has_nonstatic_concrete_methods,
5657 CHECK);
5658
5659 assert(_local_interfaces != nullptr, "invariant");
5660
5661 // Fields (offsets are filled in later)
5662 parse_fields(stream,
5663 _access_flags.is_interface(),
5664 cp,
5665 cp_size,
5666 &_java_fields_count,
5667 CHECK);
5668
5669 assert(_temp_field_info != nullptr, "invariant");
5670
5671 // Methods
5672 parse_methods(stream,
5673 _access_flags.is_interface(),
5674 &_has_localvariable_table,
5675 &_has_final_method,
5676 &_declares_nonstatic_concrete_methods,
5677 CHECK);
5678
5679 assert(_methods != nullptr, "invariant");
5680
5681 if (_declares_nonstatic_concrete_methods) {
5682 _has_nonstatic_concrete_methods = true;
5683 }
5763 // errors not checked yet.
5764 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5765 "Interfaces must have java.lang.Object as superclass in class file %s",
5766 CHECK);
5767 }
5768 Handle loader(THREAD, _loader_data->class_loader());
5769 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5770 // fast path to avoid lookup
5771 _super_klass = vmClasses::Object_klass();
5772 } else {
5773 _super_klass = (const InstanceKlass*)
5774 SystemDictionary::resolve_super_or_fail(_class_name,
5775 super_class_name,
5776 loader,
5777 true,
5778 CHECK);
5779 }
5780 }
5781
5782 if (_super_klass != nullptr) {
5783 if (_super_klass->has_nonstatic_concrete_methods()) {
5784 _has_nonstatic_concrete_methods = true;
5785 }
5786
5787 if (_super_klass->is_interface()) {
5788 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5789 return;
5790 }
5791 }
5792
5793 // Compute the transitive list of all unique interfaces implemented by this class
5794 _transitive_interfaces =
5795 compute_transitive_interfaces(_super_klass,
5796 _local_interfaces,
5797 _loader_data,
5798 CHECK);
5799
5800 assert(_transitive_interfaces != nullptr, "invariant");
5801
5802 // sort methods
5803 _method_ordering = sort_methods(_methods);
5804
5805 _all_mirandas = new GrowableArray<Method*>(20);
5806
5807 Handle loader(THREAD, _loader_data->class_loader());
5808 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5809 &_num_miranda_methods,
5810 _all_mirandas,
5811 _super_klass,
5812 _methods,
5813 _access_flags,
5814 _major_version,
5815 loader,
5816 _class_name,
5817 _local_interfaces);
5818
5819 // Size of Java itable (in words)
5820 _itable_size = _access_flags.is_interface() ? 0 :
5821 klassItable::compute_itable_size(_transitive_interfaces);
5822
5823 assert(_parsed_annotations != nullptr, "invariant");
5824
5825 _field_info = new FieldLayoutInfo();
5826 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5827 _parsed_annotations->is_contended(), _field_info);
5828 lb.build_layout();
5829
5830 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5831 _fieldinfo_stream =
5832 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5833 injected_fields_count, loader_data(), CHECK);
5834 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
5835 _fields_status =
5836 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5837 FieldStatus(0), CHECK);
5838 }
5839
5840 void ClassFileParser::set_klass(InstanceKlass* klass) {
5841
5842 #ifdef ASSERT
5843 if (klass != nullptr) {
5844 assert(nullptr == _klass, "leaking?");
5845 }
5846 #endif
5847
5848 _klass = klass;
5849 }
5850
5851 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5852
5853 #ifdef ASSERT
5854 if (klass != nullptr) {
5855 assert(nullptr == _klass_to_deallocate, "leaking?");
5856 }
5857 #endif
5858
5859 _klass_to_deallocate = klass;
5860 }
5861
5862 // Caller responsible for ResourceMark
5863 // clone stream with rewound position
5864 const ClassFileStream* ClassFileParser::clone_stream() const {
5865 assert(_stream != nullptr, "invariant");
5866
5867 return _stream->clone();
5868 }
5869
5870 ReferenceType ClassFileParser::super_reference_type() const {
|
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cdsConfig.hpp"
26 #include "classfile/classFileParser.hpp"
27 #include "classfile/classFileStream.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/classLoadInfo.hpp"
31 #include "classfile/defaultMethods.hpp"
32 #include "classfile/fieldLayoutBuilder.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/verificationType.hpp"
39 #include "classfile/verifier.hpp"
40 #include "classfile/vmClasses.hpp"
41 #include "classfile/vmSymbols.hpp"
42 #include "jvm.h"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.hpp"
46 #include "memory/metadataFactory.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/annotations.hpp"
51 #include "oops/bsmAttribute.inline.hpp"
52 #include "oops/constantPool.inline.hpp"
53 #include "oops/fieldInfo.hpp"
54 #include "oops/fieldStreams.inline.hpp"
55 #include "oops/inlineKlass.inline.hpp"
56 #include "oops/instanceKlass.inline.hpp"
57 #include "oops/instanceMirrorKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/klassVtable.hpp"
60 #include "oops/metadata.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/recordComponent.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiThreadState.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/fieldDescriptor.inline.hpp"
69 #include "runtime/handles.inline.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.hpp"
73 #include "runtime/reflection.hpp"
74 #include "runtime/safepointVerifiers.hpp"
75 #include "runtime/signature.hpp"
76 #include "runtime/timer.hpp"
77 #include "services/classLoadingService.hpp"
78 #include "services/threadService.hpp"
79 #include "utilities/align.hpp"
80 #include "utilities/bitMap.inline.hpp"
81 #include "utilities/checkedCast.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/exceptions.hpp"
84 #include "utilities/formatBuffer.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/growableArray.hpp"
87 #include "utilities/hashTable.hpp"
88 #include "utilities/macros.hpp"
89 #include "utilities/ostream.hpp"
90 #include "utilities/stringUtils.hpp"
91 #include "utilities/utf8.hpp"
92 #if INCLUDE_CDS
93 #include "classfile/systemDictionaryShared.hpp"
94 #endif
95
96 // We generally try to create the oops directly when parsing, rather than
97 // allocating temporary data structures and copying the bytes twice. A
98 // temporary area is only needed when parsing utf8 entries in the constant
99 // pool and when parsing line number tables.
100
101 // We add assert in debug mode when class format is not checked.
102
103 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
104 #define JAVA_MIN_SUPPORTED_VERSION 45
105 #define JAVA_PREVIEW_MINOR_VERSION 65535
106
107 // Used for two backward compatibility reasons:
108 // - to check for new additions to the class file format in JDK1.5
109 // - to check for bug fixes in the format checker in JDK1.5
110 #define JAVA_1_5_VERSION 49
484 guarantee_property(valid_symbol_at(name_ref_index),
485 "Invalid constant pool index %u in class file %s",
486 name_ref_index, CHECK);
487 guarantee_property(valid_symbol_at(signature_ref_index),
488 "Invalid constant pool index %u in class file %s",
489 signature_ref_index, CHECK);
490 break;
491 }
492 case JVM_CONSTANT_Utf8:
493 break;
494 case JVM_CONSTANT_UnresolvedClass: // fall-through
495 case JVM_CONSTANT_UnresolvedClassInError: {
496 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
497 break;
498 }
499 case JVM_CONSTANT_ClassIndex: {
500 const int class_index = cp->klass_index_at(index);
501 guarantee_property(valid_symbol_at(class_index),
502 "Invalid constant pool index %u in class file %s",
503 class_index, CHECK);
504
505 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
506 break;
507 }
508 case JVM_CONSTANT_StringIndex: {
509 const int string_index = cp->string_index_at(index);
510 guarantee_property(valid_symbol_at(string_index),
511 "Invalid constant pool index %u in class file %s",
512 string_index, CHECK);
513 Symbol* const sym = cp->symbol_at(string_index);
514 cp->unresolved_string_at_put(index, sym);
515 break;
516 }
517 case JVM_CONSTANT_MethodHandle: {
518 const int ref_index = cp->method_handle_index_at(index);
519 guarantee_property(valid_cp_range(ref_index, length),
520 "Invalid constant pool index %u in class file %s",
521 ref_index, CHECK);
522 const constantTag tag = cp->tag_at(ref_index);
523 const int ref_kind = cp->method_handle_ref_kind_at(index);
524
926 class AnnotationCollector : public ResourceObj{
927 public:
928 enum Location { _in_field, _in_method, _in_class };
929 enum ID {
930 _unknown = 0,
931 _method_CallerSensitive,
932 _method_ForceInline,
933 _method_DontInline,
934 _method_ChangesCurrentThread,
935 _method_JvmtiHideEvents,
936 _method_JvmtiMountTransition,
937 _method_InjectedProfile,
938 _method_LambdaForm_Compiled,
939 _method_Hidden,
940 _method_Scoped,
941 _method_IntrinsicCandidate,
942 _jdk_internal_vm_annotation_Contended,
943 _field_Stable,
944 _jdk_internal_vm_annotation_ReservedStackAccess,
945 _jdk_internal_ValueBased,
946 _jdk_internal_LooselyConsistentValue,
947 _jdk_internal_NullRestricted,
948 _java_lang_Deprecated,
949 _java_lang_Deprecated_for_removal,
950 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
951 _method_AOTRuntimeSetup,
952 _jdk_internal_vm_annotation_TrustFinalFields,
953 _annotation_LIMIT
954 };
955 const Location _location;
956 int _annotations_present;
957 u2 _contended_group;
958
959 AnnotationCollector(Location location)
960 : _location(location), _annotations_present(0), _contended_group(0)
961 {
962 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
963 }
964 // If this annotation name has an ID, report it (or _none).
965 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
966 // Set the annotation name:
967 void set_annotation(ID id) {
1362 }
1363
1364 *constantvalue_index_addr = constantvalue_index;
1365 *is_synthetic_addr = is_synthetic;
1366 *generic_signature_index_addr = generic_signature_index;
1367 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1368 runtime_visible_annotations_length,
1369 CHECK);
1370 parsed_annotations->set_field_annotations(a);
1371 a = allocate_annotations(runtime_visible_type_annotations,
1372 runtime_visible_type_annotations_length,
1373 CHECK);
1374 parsed_annotations->set_field_type_annotations(a);
1375 return;
1376 }
1377
1378
1379 // Side-effects: populates the _fields, _fields_annotations,
1380 // _fields_type_annotations fields
1381 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1382 AccessFlags class_access_flags,
1383 ConstantPool* cp,
1384 const int cp_size,
1385 u2* const java_fields_count_ptr,
1386 TRAPS) {
1387
1388 assert(cfs != nullptr, "invariant");
1389 assert(cp != nullptr, "invariant");
1390 assert(java_fields_count_ptr != nullptr, "invariant");
1391
1392 assert(nullptr == _fields_annotations, "invariant");
1393 assert(nullptr == _fields_type_annotations, "invariant");
1394
1395 // "inline type" means concrete value class
1396 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1397 // "value class" can be either abstract or concrete value class
1398 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1399 cfs->guarantee_more(2, CHECK); // length
1400 const u2 length = cfs->get_u2_fast();
1401 *java_fields_count_ptr = length;
1402
1403 int num_injected = 0;
1404 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1405 &num_injected);
1406
1407 // Two more slots are required for inline classes:
1408 // - The static field ".null_reset" which carries the nullable flat layout
1409 // representation of null, added below
1410 // - The nonstatic field ".empty" the JVM injects when detecting an empty
1411 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout
1412 // One more slot is required for both abstract value class and inline classes:
1413 // - The static field ".acmp_maps" for acmp and identity hash, tracks
1414 // nonstatic fields both inherited or declared, added below
1415 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1416 + (is_value_class ? 1 : 0);
1417
1418 // Allocate a temporary resource array to collect field data.
1419 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1420 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1421
1422 ResourceMark rm(THREAD);
1423 for (int n = 0; n < length; n++) {
1424 // access_flags, name_index, descriptor_index, attributes_count
1425 cfs->guarantee_more(8, CHECK);
1426
1427 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1428 if (!supports_inline_types()) {
1429 recognized_modifiers &= ~JVM_ACC_STRICT_INIT;
1430 }
1431
1432 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1433 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1434 AccessFlags access_flags;
1435 access_flags.set_flags(flags);
1436 FieldInfo::FieldFlags fieldFlags(0);
1437
1438 const u2 name_index = cfs->get_u2_fast();
1439 guarantee_property(valid_symbol_at(name_index),
1440 "Invalid constant pool index %u for field name in class file %s",
1441 name_index, CHECK);
1442 const Symbol* const name = cp->symbol_at(name_index);
1443 verify_legal_field_name(name, CHECK);
1444
1445 const u2 signature_index = cfs->get_u2_fast();
1446 guarantee_property(valid_symbol_at(signature_index),
1447 "Invalid constant pool index %u for field signature in class file %s",
1448 signature_index, CHECK);
1449 const Symbol* const sig = cp->symbol_at(signature_index);
1450 verify_legal_field_signature(name, sig, CHECK);
1451
1452 u2 constantvalue_index = 0;
1453 bool is_synthetic = false;
1454 u2 generic_signature_index = 0;
1455 const bool is_static = access_flags.is_static();
1456 FieldAnnotationCollector parsed_annotations(_loader_data);
1457
1458 bool is_null_restricted = false;
1459
1460 const u2 attributes_count = cfs->get_u2_fast();
1461 if (attributes_count > 0) {
1462 parse_field_attributes(cfs,
1463 attributes_count,
1464 is_static,
1465 signature_index,
1466 &constantvalue_index,
1467 &is_synthetic,
1468 &generic_signature_index,
1469 &parsed_annotations,
1470 CHECK);
1471
1472 if (parsed_annotations.field_annotations() != nullptr) {
1473 if (_fields_annotations == nullptr) {
1474 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1475 _loader_data, length, nullptr,
1476 CHECK);
1477 }
1478 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1479 parsed_annotations.set_field_annotations(nullptr);
1480 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1481 if (!Signature::has_envelope(sig)) {
1482 Exceptions::fthrow(
1483 THREAD_AND_LOCATION,
1484 vmSymbols::java_lang_ClassFormatError(),
1485 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1486 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1487 return;
1488 }
1489 if (!supports_inline_types()) {
1490 Exceptions::fthrow(
1491 THREAD_AND_LOCATION,
1492 vmSymbols::java_lang_ClassFormatError(),
1493 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file",
1494 class_name()->as_C_string(), name->as_C_string());
1495 return;
1496 }
1497
1498 if ((flags & JVM_ACC_STRICT_INIT) == 0) {
1499 // Inject STRICT_INIT and validate in context
1500 const jint patched_flags = flags | JVM_ACC_STRICT_INIT;
1501 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK);
1502 access_flags.set_flags(patched_flags);
1503 }
1504 is_null_restricted = true;
1505 }
1506 }
1507 if (parsed_annotations.field_type_annotations() != nullptr) {
1508 if (_fields_type_annotations == nullptr) {
1509 _fields_type_annotations =
1510 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1511 length,
1512 nullptr,
1513 CHECK);
1514 }
1515 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1516 parsed_annotations.set_field_type_annotations(nullptr);
1517 }
1518
1519 if (is_synthetic) {
1520 access_flags.set_is_synthetic();
1521 }
1522 if (generic_signature_index != 0) {
1523 fieldFlags.update_generic(true);
1524 }
1525 }
1526
1527 if (is_null_restricted) {
1528 fieldFlags.update_null_free_inline_type(true);
1529 }
1530
1531 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1532
1533 // Update number of static oop fields.
1534 if (is_static && is_reference_type(type)) {
1535 _static_oop_count++;
1536 }
1537
1538 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1539 fi.set_index(n);
1540 if (fieldFlags.is_generic()) {
1541 fi.set_generic_signature_index(generic_signature_index);
1542 }
1543 parsed_annotations.apply_to(&fi);
1544 if (fi.field_flags().is_contended()) {
1545 _has_contended_fields = true;
1546 }
1547 if (access_flags.is_strict() && access_flags.is_static()) {
1548 _has_strict_static_fields = true;
1549 }
1550 _temp_field_info->append(fi);
1551 }
1552 assert(_temp_field_info->length() == length, "Must be");
1553
1554 if (num_injected != 0) {
1555 for (int n = 0; n < num_injected; n++) {
1556 // Check for duplicates
1557 if (injected[n].may_be_java) {
1558 const Symbol* const name = injected[n].name();
1559 const Symbol* const signature = injected[n].signature();
1560 bool duplicate = false;
1561 for (int i = 0; i < length; i++) {
1562 const FieldInfo* const f = _temp_field_info->adr_at(i);
1563 if (name == cp->symbol_at(f->name_index()) &&
1564 signature == cp->symbol_at(f->signature_index())) {
1565 // Symbol is desclared in Java so skip this one
1566 duplicate = true;
1567 break;
1568 }
1569 }
1570 if (duplicate) {
1571 // These will be removed from the field array at the end
1572 continue;
1573 }
1574 }
1575
1576 // Injected field
1577 FieldInfo::FieldFlags fflags(0);
1578 fflags.update_injected(true);
1579 AccessFlags aflags;
1580 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1581 int idx = _temp_field_info->append(fi);
1582 _temp_field_info->adr_at(idx)->set_index(idx);
1583 }
1584 }
1585
1586 if (is_inline_type) {
1587 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1588 // It should never be seen by user code, it is used when writing "null" to a nullable flat field
1589 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1590 // alive.
1591 FieldInfo::FieldFlags fflags2(0);
1592 fflags2.update_injected(true);
1593 AccessFlags aflags2(JVM_ACC_STATIC);
1594 FieldInfo fi2(aflags2,
1595 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1596 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1597 0,
1598 fflags2);
1599 int idx2 = _temp_field_info->append(fi2);
1600 _temp_field_info->adr_at(idx2)->set_index(idx2);
1601 _static_oop_count++;
1602 }
1603 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1604 && _class_name != vmSymbols::java_lang_Object()) {
1605 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1606 FieldInfo::FieldFlags fflags2(0);
1607 fflags2.update_injected(true);
1608 fflags2.update_stable(true);
1609 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1610 FieldInfo fi3(aflags2,
1611 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1612 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1613 0,
1614 fflags2);
1615 int idx2 = _temp_field_info->append(fi3);
1616 _temp_field_info->adr_at(idx2)->set_index(idx2);
1617 _static_oop_count++;
1618 }
1619
1620 if (_need_verify && length > 1) {
1621 // Check duplicated fields
1622 ResourceMark rm(THREAD);
1623 // Set containing name-signature pairs
1624 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1625 for (int i = 0; i < _temp_field_info->length(); i++) {
1626 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1627 _temp_field_info->adr_at(i)->signature(_cp));
1628 // If no duplicates, add name/signature in hashtable names_and_sigs.
1629 if(!names_and_sigs->put(name_and_sig, 0)) {
1630 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1631 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1632 return;
1633 }
1634 }
1635 }
1636 }
1637
1638
1983 }
1984 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1985 if (_location != _in_field && _location != _in_class) {
1986 break; // only allow for fields and classes
1987 }
1988 if (!EnableContended || (RestrictContended && !privileged)) {
1989 break; // honor privileges
1990 }
1991 return _jdk_internal_vm_annotation_Contended;
1992 }
1993 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1994 if (_location != _in_method) break; // only allow for methods
1995 if (RestrictReservedStack && !privileged) break; // honor privileges
1996 return _jdk_internal_vm_annotation_ReservedStackAccess;
1997 }
1998 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1999 if (_location != _in_class) break; // only allow for classes
2000 if (!privileged) break; // only allow in privileged code
2001 return _jdk_internal_ValueBased;
2002 }
2003 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2004 if (_location != _in_class) break; // only allow for classes
2005 return _jdk_internal_LooselyConsistentValue;
2006 }
2007 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2008 if (_location != _in_field) break; // only allow for fields
2009 return _jdk_internal_NullRestricted;
2010 }
2011 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2012 return _java_lang_Deprecated;
2013 }
2014 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2015 if (_location != _in_class) break; // only allow for classes
2016 if (!privileged) break; // only allow in privileged code
2017 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2018 }
2019 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2020 if (_location != _in_method) break; // only allow for methods
2021 if (!privileged) break; // only allow in privileged code
2022 return _method_AOTRuntimeSetup;
2023 }
2024 default: {
2025 break;
2026 }
2027 }
2028 return AnnotationCollector::_unknown;
2029 }
2030
2271
2272 const u2 signature_index = cfs->get_u2_fast();
2273 guarantee_property(
2274 valid_symbol_at(signature_index),
2275 "Illegal constant pool index %u for method signature in class file %s",
2276 signature_index, CHECK_NULL);
2277 const Symbol* const signature = cp->symbol_at(signature_index);
2278
2279 if (name == vmSymbols::class_initializer_name()) {
2280 // We ignore the other access flags for a valid class initializer.
2281 // (JVM Spec 2nd ed., chapter 4.6)
2282 if (_major_version < 51) { // backward compatibility
2283 flags = JVM_ACC_STATIC;
2284 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2285 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2286 } else {
2287 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2288 return nullptr;
2289 }
2290 } else {
2291 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL);
2292 }
2293
2294 if (name == vmSymbols::object_initializer_name() && is_interface) {
2295 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2296 return nullptr;
2297 }
2298
2299 if (Arguments::is_valhalla_enabled()) {
2300 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2301 && ((flags & JVM_ACC_STATIC) == 0 )
2302 && !_access_flags.is_identity_class()) {
2303 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2304 return nullptr;
2305 }
2306 }
2307
2308 int args_size = -1; // only used when _need_verify is true
2309 if (_need_verify) {
2310 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2311 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2312 verify_legal_method_signature(name, signature, CHECK_NULL);
2313 if (args_size > MAX_ARGS_SIZE) {
2314 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2315 return nullptr;
2316 }
2317 }
2318
2319 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2320
2321 // Default values for code and exceptions attribute elements
2322 u2 max_stack = 0;
2323 u2 max_locals = 0;
2324 u4 code_length = 0;
2325 const u1* code_start = nullptr;
2326 u2 exception_table_length = 0;
2327 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
3111 valid_klass_reference_at(outer_class_info_index),
3112 "outer_class_info_index %u has bad constant type in class file %s",
3113 outer_class_info_index, CHECK_0);
3114
3115 if (outer_class_info_index != 0) {
3116 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3117 char* bytes = (char*)outer_class_name->bytes();
3118 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3119 "Outer class is an array class in class file %s", CHECK_0);
3120 }
3121 // Inner class name
3122 const u2 inner_name_index = cfs->get_u2_fast();
3123 guarantee_property(
3124 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3125 "inner_name_index %u has bad constant type in class file %s",
3126 inner_name_index, CHECK_0);
3127 if (_need_verify) {
3128 guarantee_property(inner_class_info_index != outer_class_info_index,
3129 "Class is both outer and inner class in class file %s", CHECK_0);
3130 }
3131
3132 // Access flags
3133 u2 flags;
3134 // JVM_ACC_MODULE is defined in JDK-9 and later.
3135 if (_major_version >= JAVA_9_VERSION) {
3136 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3137 } else {
3138 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3139 }
3140
3141 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3142 // Set abstract bit for old class files for backward compatibility
3143 flags |= JVM_ACC_ABSTRACT;
3144 }
3145
3146 if (!supports_inline_types()) {
3147 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3148 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3149 if (!is_module && !is_interface) {
3150 flags |= JVM_ACC_IDENTITY;
3151 }
3152 }
3153
3154 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3155 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3156 AccessFlags inner_access_flags(flags);
3157
3158 inner_classes->at_put(index++, inner_class_info_index);
3159 inner_classes->at_put(index++, outer_class_info_index);
3160 inner_classes->at_put(index++, inner_name_index);
3161 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3162 }
3163
3164 // Check for circular and duplicate entries.
3165 bool has_circularity = false;
3166 if (_need_verify) {
3167 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3168 if (has_circularity) {
3169 // If circularity check failed then ignore InnerClasses attribute.
3170 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3171 index = 0;
3172 if (parsed_enclosingmethod_attribute) {
3173 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3239 if (length > 0) {
3240 int index = 0;
3241 cfs->guarantee_more(2 * length, CHECK_0);
3242 for (int n = 0; n < length; n++) {
3243 const u2 class_info_index = cfs->get_u2_fast();
3244 guarantee_property(
3245 valid_klass_reference_at(class_info_index),
3246 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3247 class_info_index, CHECK_0);
3248 permitted_subclasses->at_put(index++, class_info_index);
3249 }
3250 assert(index == size, "wrong size");
3251 }
3252
3253 // Restore buffer's current position.
3254 cfs->set_current(current_mark);
3255
3256 return length;
3257 }
3258
3259 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3260 const u1* const loadable_descriptors_attribute_start,
3261 TRAPS) {
3262 const u1* const current_mark = cfs->current();
3263 u2 length = 0;
3264 if (loadable_descriptors_attribute_start != nullptr) {
3265 cfs->set_current(loadable_descriptors_attribute_start);
3266 cfs->guarantee_more(2, CHECK_0); // length
3267 length = cfs->get_u2_fast();
3268 }
3269 const int size = length;
3270 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3271 _loadable_descriptors = loadable_descriptors;
3272 if (length > 0) {
3273 int index = 0;
3274 cfs->guarantee_more(2 * length, CHECK_0);
3275 for (int n = 0; n < length; n++) {
3276 const u2 descriptor_index = cfs->get_u2_fast();
3277 guarantee_property(
3278 valid_symbol_at(descriptor_index),
3279 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3280 descriptor_index, CHECK_0);
3281 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3282 bool valid = legal_field_signature(descriptor, CHECK_0);
3283 if(!valid) {
3284 ResourceMark rm(THREAD);
3285 Exceptions::fthrow(THREAD_AND_LOCATION,
3286 vmSymbols::java_lang_ClassFormatError(),
3287 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3288 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3289 return 0;
3290 }
3291 loadable_descriptors->at_put(index++, descriptor_index);
3292 }
3293 assert(index == size, "wrong size");
3294 }
3295
3296 // Restore buffer's current position.
3297 cfs->set_current(current_mark);
3298
3299 return length;
3300 }
3301
3302 // Record {
3303 // u2 attribute_name_index;
3304 // u4 attribute_length;
3305 // u2 components_count;
3306 // component_info components[components_count];
3307 // }
3308 // component_info {
3309 // u2 name_index;
3310 // u2 descriptor_index
3311 // u2 attributes_count;
3312 // attribute_info_attributes[attributes_count];
3313 // }
3314 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3315 const ConstantPool* cp,
3316 const u1* const record_attribute_start,
3317 TRAPS) {
3318 const u1* const current_mark = cfs->current();
3319 int components_count = 0;
3320 unsigned int calculate_attr_size = 0;
3321 if (record_attribute_start != nullptr) {
3532 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3533 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3534 "Bad length on BootstrapMethods in class file %s",
3535 CHECK);
3536 }
3537
3538 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3539 ConstantPool* cp,
3540 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3541 TRAPS) {
3542 assert(cfs != nullptr, "invariant");
3543 assert(cp != nullptr, "invariant");
3544 assert(parsed_annotations != nullptr, "invariant");
3545
3546 // Set inner classes attribute to default sentinel
3547 _inner_classes = Universe::the_empty_short_array();
3548 // Set nest members attribute to default sentinel
3549 _nest_members = Universe::the_empty_short_array();
3550 // Set _permitted_subclasses attribute to default sentinel
3551 _permitted_subclasses = Universe::the_empty_short_array();
3552 // Set _loadable_descriptors attribute to default sentinel
3553 _loadable_descriptors = Universe::the_empty_short_array();
3554 cfs->guarantee_more(2, CHECK); // attributes_count
3555 u2 attributes_count = cfs->get_u2_fast();
3556 bool parsed_sourcefile_attribute = false;
3557 bool parsed_innerclasses_attribute = false;
3558 bool parsed_nest_members_attribute = false;
3559 bool parsed_permitted_subclasses_attribute = false;
3560 bool parsed_loadable_descriptors_attribute = false;
3561 bool parsed_nest_host_attribute = false;
3562 bool parsed_record_attribute = false;
3563 bool parsed_enclosingmethod_attribute = false;
3564 bool parsed_bootstrap_methods_attribute = false;
3565 const u1* runtime_visible_annotations = nullptr;
3566 int runtime_visible_annotations_length = 0;
3567 const u1* runtime_visible_type_annotations = nullptr;
3568 int runtime_visible_type_annotations_length = 0;
3569 bool runtime_invisible_type_annotations_exists = false;
3570 bool runtime_invisible_annotations_exists = false;
3571 bool parsed_source_debug_ext_annotations_exist = false;
3572 const u1* inner_classes_attribute_start = nullptr;
3573 u4 inner_classes_attribute_length = 0;
3574 u2 enclosing_method_class_index = 0;
3575 u2 enclosing_method_method_index = 0;
3576 const u1* nest_members_attribute_start = nullptr;
3577 u4 nest_members_attribute_length = 0;
3578 const u1* record_attribute_start = nullptr;
3579 u4 record_attribute_length = 0;
3580 const u1* permitted_subclasses_attribute_start = nullptr;
3581 u4 permitted_subclasses_attribute_length = 0;
3582 const u1* loadable_descriptors_attribute_start = nullptr;
3583 u4 loadable_descriptors_attribute_length = 0;
3584
3585 // Iterate over attributes
3586 while (attributes_count--) {
3587 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3588 const u2 attribute_name_index = cfs->get_u2_fast();
3589 const u4 attribute_length = cfs->get_u4_fast();
3590 guarantee_property(
3591 valid_symbol_at(attribute_name_index),
3592 "Attribute name has bad constant pool index %u in class file %s",
3593 attribute_name_index, CHECK);
3594 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3595 if (tag == vmSymbols::tag_source_file()) {
3596 // Check for SourceFile tag
3597 if (_need_verify) {
3598 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3599 }
3600 if (parsed_sourcefile_attribute) {
3601 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3602 return;
3603 } else {
3779 return;
3780 }
3781 parsed_record_attribute = true;
3782 record_attribute_start = cfs->current();
3783 record_attribute_length = attribute_length;
3784 } else if (_major_version >= JAVA_17_VERSION) {
3785 if (tag == vmSymbols::tag_permitted_subclasses()) {
3786 if (parsed_permitted_subclasses_attribute) {
3787 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3788 return;
3789 }
3790 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3791 if (_access_flags.is_final()) {
3792 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3793 return;
3794 }
3795 parsed_permitted_subclasses_attribute = true;
3796 permitted_subclasses_attribute_start = cfs->current();
3797 permitted_subclasses_attribute_length = attribute_length;
3798 }
3799 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3800 if (parsed_loadable_descriptors_attribute) {
3801 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3802 return;
3803 }
3804 parsed_loadable_descriptors_attribute = true;
3805 loadable_descriptors_attribute_start = cfs->current();
3806 loadable_descriptors_attribute_length = attribute_length;
3807 }
3808 }
3809 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3810 cfs->skip_u1(attribute_length, CHECK);
3811 } else {
3812 // Unknown attribute
3813 cfs->skip_u1(attribute_length, CHECK);
3814 }
3815 } else {
3816 // Unknown attribute
3817 cfs->skip_u1(attribute_length, CHECK);
3818 }
3819 } else {
3820 // Unknown attribute
3821 cfs->skip_u1(attribute_length, CHECK);
3822 }
3823 }
3824 _class_annotations = allocate_annotations(runtime_visible_annotations,
3825 runtime_visible_annotations_length,
3826 CHECK);
3827 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3864 CHECK);
3865 if (_need_verify) {
3866 guarantee_property(record_attribute_length == calculated_attr_length,
3867 "Record attribute has wrong length in class file %s",
3868 CHECK);
3869 }
3870 }
3871
3872 if (parsed_permitted_subclasses_attribute) {
3873 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3874 cfs,
3875 permitted_subclasses_attribute_start,
3876 CHECK);
3877 if (_need_verify) {
3878 guarantee_property(
3879 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3880 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3881 }
3882 }
3883
3884 if (parsed_loadable_descriptors_attribute) {
3885 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3886 cfs,
3887 loadable_descriptors_attribute_start,
3888 CHECK);
3889 if (_need_verify) {
3890 guarantee_property(
3891 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3892 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3893 }
3894 }
3895
3896 if (_max_bootstrap_specifier_index >= 0) {
3897 guarantee_property(parsed_bootstrap_methods_attribute,
3898 "Missing BootstrapMethods attribute in class file %s", CHECK);
3899 }
3900 }
3901
3902 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3903 assert(k != nullptr, "invariant");
3904
3905 if (_synthetic_flag)
3906 k->set_is_synthetic();
3907 if (_sourcefile_index != 0) {
3908 k->set_source_file_name_index(_sourcefile_index);
3909 }
3910 if (_generic_signature_index != 0) {
3911 k->set_generic_signature_index(_generic_signature_index);
3912 }
3913 if (_sde_buffer != nullptr) {
3914 k->set_source_debug_extension(_sde_buffer, _sde_length);
3915 }
3942 _class_type_annotations = nullptr;
3943 _fields_annotations = nullptr;
3944 _fields_type_annotations = nullptr;
3945 }
3946
3947 // Transfer ownership of metadata allocated to the InstanceKlass.
3948 void ClassFileParser::apply_parsed_class_metadata(
3949 InstanceKlass* this_klass,
3950 int java_fields_count) {
3951 assert(this_klass != nullptr, "invariant");
3952
3953 _cp->set_pool_holder(this_klass);
3954 this_klass->set_constants(_cp);
3955 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3956 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3957 this_klass->set_fields_status(_fields_status);
3958 this_klass->set_methods(_methods);
3959 this_klass->set_inner_classes(_inner_classes);
3960 this_klass->set_nest_members(_nest_members);
3961 this_klass->set_nest_host_index(_nest_host);
3962 this_klass->set_loadable_descriptors(_loadable_descriptors);
3963 this_klass->set_annotations(_combined_annotations);
3964 this_klass->set_permitted_subclasses(_permitted_subclasses);
3965 this_klass->set_record_components(_record_components);
3966 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3967
3968 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3969
3970 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3971 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3972 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3973 // its _super. If an OOM occurs while loading the current klass, its _super field
3974 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3975 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3976 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3977
3978 // Clear out these fields so they don't get deallocated by the destructor
3979 clear_class_metadata();
3980 }
3981
3982 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3983 int anno_length,
3984 TRAPS) {
3985 AnnotationArray* annotations = nullptr;
3986 if (anno != nullptr) {
3987 annotations = MetadataFactory::new_array<u1>(_loader_data,
3988 anno_length,
3989 CHECK_(annotations));
3990 for (int i = 0; i < anno_length; i++) {
3991 annotations->at_put(i, anno[i]);
3992 }
3993 }
3994 return annotations;
3995 }
3996
3997 void ClassFileParser::check_super_class(ConstantPool* const cp,
3998 const int super_class_index,
3999 const bool need_verify,
4000 TRAPS) {
4001 assert(cp != nullptr, "invariant");
4002
4003 if (super_class_index == 0) {
4004 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
4005 "Invalid superclass index 0 in class file %s",
4006 CHECK);
4007 } else {
4008 guarantee_property(valid_klass_reference_at(super_class_index),
4009 "Invalid superclass index %u in class file %s",
4010 super_class_index,
4011 CHECK);
4012
4013 // The class name should be legal because it is checked when parsing constant pool.
4014 // However, make sure it is not an array type.
4015 if (need_verify) {
4016 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4017 "Bad superclass name in class file %s", CHECK);
4018 }
4019 }
4020 }
4021
4022 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4023 _max_nonstatic_oop_maps = max_blocks;
4024 _nonstatic_oop_map_count = 0;
4025 if (max_blocks == 0) {
4177 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4178 assert(ik->size_helper() > 0, "layout_helper is initialized");
4179 if (ik->is_abstract() || ik->is_interface()
4180 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4181 || ik->size_helper() >= FastAllocateSizeLimit) {
4182 // Forbid fast-path allocation.
4183 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4184 ik->set_layout_helper(lh);
4185 }
4186
4187 // Propagate the AOT runtimeSetup method discovery
4188 if (_has_aot_runtime_setup_method) {
4189 ik->set_is_runtime_setup_required();
4190 if (log_is_enabled(Info, aot, init)) {
4191 ResourceMark rm;
4192 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4193 }
4194 }
4195 }
4196
4197 bool ClassFileParser::supports_inline_types() const {
4198 // Inline types are only supported by class file version 71.65535 and later
4199 return _major_version > JAVA_27_VERSION ||
4200 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4201 }
4202
4203 // utility methods for appending an array with check for duplicates
4204
4205 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4206 const Array<InstanceKlass*>* const ifs) {
4207 // iterate over new interfaces
4208 for (int i = 0; i < ifs->length(); i++) {
4209 InstanceKlass* const e = ifs->at(i);
4210 assert(e->is_klass() && e->is_interface(), "just checking");
4211 // add new interface
4212 result->append_if_missing(e);
4213 }
4214 }
4215
4216 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4217 Array<InstanceKlass*>* local_ifs,
4218 ClassLoaderData* loader_data,
4219 TRAPS) {
4220 assert(local_ifs != nullptr, "invariant");
4221 assert(loader_data != nullptr, "invariant");
4222
4249 } else {
4250 ResourceMark rm;
4251 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4252
4253 // Copy down from superclass
4254 if (super != nullptr) {
4255 append_interfaces(result, super->transitive_interfaces());
4256 }
4257
4258 // Copy down from local interfaces' superinterfaces
4259 for (int i = 0; i < local_size; i++) {
4260 InstanceKlass* const l = local_ifs->at(i);
4261 append_interfaces(result, l->transitive_interfaces());
4262 }
4263 // Finally add local interfaces
4264 append_interfaces(result, local_ifs);
4265
4266 // length will be less than the max_transitive_size if duplicates were removed
4267 const int length = result->length();
4268 assert(length <= max_transitive_size, "just checking");
4269
4270 Array<InstanceKlass*>* const new_result =
4271 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4272 for (int i = 0; i < length; i++) {
4273 InstanceKlass* const e = result->at(i);
4274 assert(e != nullptr, "just checking");
4275 new_result->at_put(i, e);
4276 }
4277 return new_result;
4278 }
4279 }
4280
4281 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4282 assert(this_klass != nullptr, "invariant");
4283 const InstanceKlass* const super = this_klass->super();
4284
4285 if (super != nullptr) {
4286 if (super->is_final()) {
4287 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4288 return;
4289 }
4290
4291 if (super->is_sealed()) {
4292 stringStream ss;
4293 ResourceMark rm(THREAD);
4294 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4295 classfile_icce_error(ss.as_string(), THREAD);
4296 return;
4297 }
4298 }
4299
4300 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4301 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4302 // for a value classes. So, it is treated as a special case for now.
4303 if (!this_klass->access_flags().is_identity_class() &&
4304 super->name() != vmSymbols::java_lang_Object() &&
4305 super->is_identity_class()) {
4306 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4307 return;
4308 }
4309
4310 Reflection::VerifyClassAccessResults vca_result =
4311 Reflection::verify_class_access(this_klass, super, false);
4312 if (vca_result != Reflection::ACCESS_OK) {
4313 ResourceMark rm(THREAD);
4314 char* msg = Reflection::verify_class_access_msg(this_klass,
4315 super,
4316 vca_result);
4317
4318 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4319 if (msg == nullptr) {
4320 bool same_module = (this_klass->module() == super->module());
4321 Exceptions::fthrow(
4322 THREAD_AND_LOCATION,
4323 vmSymbols::java_lang_IllegalAccessError(),
4324 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4325 this_klass->external_name(),
4326 super->is_abstract() ? "abstract " : "",
4327 super->external_name(),
4328 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4329 (same_module) ? "" : "; ",
4482 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4483 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4484 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4485 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4486 if (is_module) {
4487 ResourceMark rm(THREAD);
4488 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4489 Exceptions::fthrow(
4490 THREAD_AND_LOCATION,
4491 vmSymbols::java_lang_NoClassDefFoundError(),
4492 "%s is not a class because access_flag ACC_MODULE is set",
4493 _class_name->as_C_string());
4494 return;
4495 }
4496
4497 if (!_need_verify) { return; }
4498
4499 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4500 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4501 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4502 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4503 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4504 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4505 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4506 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final));
4507
4508 if ((is_abstract && is_final) ||
4509 (is_interface && !is_abstract) ||
4510 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4511 (!is_interface && major_gte_1_5 && is_annotation) ||
4512 (!valid_value_class)) {
4513 ResourceMark rm(THREAD);
4514 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4515 if (inner_name == nullptr && !is_anonymous_inner_class) {
4516 Exceptions::fthrow(
4517 THREAD_AND_LOCATION,
4518 vmSymbols::java_lang_ClassFormatError(),
4519 "Illegal class modifiers in class %s: 0x%X",
4520 _class_name->as_C_string(), flags
4521 );
4522 } else {
4523 if (is_anonymous_inner_class) {
4524 Exceptions::fthrow(
4525 THREAD_AND_LOCATION,
4526 vmSymbols::java_lang_ClassFormatError(),
4527 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4528 _class_name->as_C_string(), flags
4529 );
4530 } else {
4531 Exceptions::fthrow(
4532 THREAD_AND_LOCATION,
4587 THREAD_AND_LOCATION,
4588 vmSymbols::java_lang_UnsupportedClassVersionError(),
4589 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4590 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4591 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4592 return;
4593 }
4594
4595 if (!Arguments::enable_preview()) {
4596 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4597 class_name, major, minor, THREAD);
4598 return;
4599 }
4600
4601 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4602 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4603 class_name, major, minor, THREAD);
4604 }
4605 }
4606
4607 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4608 AccessFlags class_access_flags,
4609 TRAPS) const {
4610 if (!_need_verify) { return; }
4611
4612 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4613 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4614 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4615 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4616 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4617 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4618 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4619 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4620 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4621 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4622
4623 const bool is_interface = class_access_flags.is_interface();
4624 const bool is_identity_class = class_access_flags.is_identity_class();
4625
4626 bool is_illegal = false;
4627 const char* error_msg = "";
4628
4629 // There is some overlap in the checks that apply, for example interface fields
4630 // must be static, static fields can't be strict, and therefore interfaces can't
4631 // have strict fields. So we don't have to check every possible invalid combination
4632 // individually as long as all are covered. Once we have found an illegal combination
4633 // we can stop checking.
4634
4635 if (!is_illegal) {
4636 if (is_interface) {
4637 if (!is_public || !is_static || !is_final || is_private ||
4638 is_protected || is_volatile || is_transient ||
4639 (major_gte_1_5 && is_enum)) {
4640 is_illegal = true;
4641 error_msg = "interface fields must be public, static and final, and may be synthetic";
4642 }
4643 } else { // not interface
4644 if (has_illegal_visibility(flags)) {
4645 is_illegal = true;
4646 error_msg = "invalid visibility flags for class field";
4647 } else if (is_final && is_volatile) {
4648 is_illegal = true;
4649 error_msg = "fields cannot be final and volatile";
4650 } else if (supports_inline_types()) {
4651 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4652 is_illegal = true;
4653 error_msg = "value class fields must be either non-static final and strict, or static";
4654 }
4655 }
4656 }
4657 }
4658
4659 if (is_illegal) {
4660 ResourceMark rm(THREAD);
4661 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4662 Exceptions::fthrow(
4663 THREAD_AND_LOCATION,
4664 vmSymbols::java_lang_ClassFormatError(),
4665 "Illegal field modifiers (%s) in class %s: 0x%X",
4666 error_msg, _class_name->as_C_string(), flags);
4667 return;
4668 }
4669 }
4670
4671 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4672 AccessFlags class_access_flags,
4673 const Symbol* name,
4674 TRAPS) const {
4675 if (!_need_verify) { return; }
4676
4677 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4678 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4679 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4680 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4681 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4682 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4683 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4684 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4685 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4686 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4687 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4688 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4689 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4690 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4691 const bool is_interface = class_access_flags.is_interface();
4692 const bool is_identity_class = class_access_flags.is_identity_class();
4693
4694 bool is_illegal = false;
4695 const char* class_note = "";
4696
4697 if (is_interface) {
4698 if (major_gte_8) {
4699 // Class file version is JAVA_8_VERSION or later Methods of
4700 // interfaces may set any of the flags except ACC_PROTECTED,
4701 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4702 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4703 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4704 (is_native || is_protected || is_final || is_synchronized) ||
4705 // If a specific method of a class or interface has its
4706 // ACC_ABSTRACT flag set, it must not have any of its
4707 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4708 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4709 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4710 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4711 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4712 is_illegal = true;
4713 }
4714 } else if (major_gte_1_5) {
4715 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4716 if (!is_public || is_private || is_protected || is_static || is_final ||
4717 is_synchronized || is_native || !is_abstract || is_strict) {
4718 is_illegal = true;
4719 }
4720 } else {
4721 // Class file version is pre-JAVA_1_5_VERSION
4722 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4723 is_illegal = true;
4724 }
4725 }
4726 } else { // not interface
4727 if (has_illegal_visibility(flags)) {
4728 is_illegal = true;
4729 } else {
4730 if (is_initializer) {
4731 if (is_static || is_final || is_synchronized || is_native ||
4732 is_abstract || (major_gte_1_5 && is_bridge)) {
4733 is_illegal = true;
4734 }
4735 } else { // not initializer
4736 if (!is_identity_class && is_synchronized && !is_static) {
4737 is_illegal = true;
4738 class_note = " (not an identity class)";
4739 } else {
4740 if (is_abstract) {
4741 if ((is_final || is_native || is_private || is_static ||
4742 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4743 is_illegal = true;
4744 }
4745 }
4746 }
4747 }
4748 }
4749 }
4750
4751 if (is_illegal) {
4752 ResourceMark rm(THREAD);
4753 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4754 Exceptions::fthrow(
4755 THREAD_AND_LOCATION,
4756 vmSymbols::java_lang_ClassFormatError(),
4757 "Method %s in class %s%s has illegal modifiers: 0x%X",
4758 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
4759 return;
4760 }
4761 }
4762
4763 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4764 int length,
4765 TRAPS) const {
4766 assert(_need_verify, "only called when _need_verify is true");
4767 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4768 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4769 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4770 }
4771 }
4772
4773 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4774 // In class names, '/' separates unqualified names. This is verified in this function also.
4775 // Method names also may not contain the characters '<' or '>', unless <init>
4776 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4777 // method. Because these names have been checked as special cases before
4778 // calling this method in verify_legal_method_name.
4796 if (type == ClassFileParser::LegalClass) {
4797 if (p == name || p+1 >= name+length ||
4798 *(p+1) == JVM_SIGNATURE_SLASH) {
4799 return false;
4800 }
4801 } else {
4802 return false; // do not permit '/' unless it's class name
4803 }
4804 break;
4805 case JVM_SIGNATURE_SPECIAL:
4806 case JVM_SIGNATURE_ENDSPECIAL:
4807 // do not permit '<' or '>' in method names
4808 if (type == ClassFileParser::LegalMethod) {
4809 return false;
4810 }
4811 }
4812 }
4813 return true;
4814 }
4815
4816 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4817 if (_loadable_descriptors == nullptr) return false;
4818 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4819 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4820 if (class_name == klass) return true;
4821 }
4822 return false;
4823 }
4824
4825 // Take pointer to a UTF8 byte string (not NUL-terminated).
4826 // Skip over the longest part of the string that could
4827 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4828 // Return a pointer to just past the fieldname.
4829 // Return null if no fieldname at all was found, or in the case of slash_ok
4830 // being true, we saw consecutive slashes (meaning we were looking for a
4831 // qualified path but found something that was badly-formed).
4832 static const char* skip_over_field_name(const char* const name,
4833 bool slash_ok,
4834 unsigned int length) {
4835 const char* p;
4836 jboolean last_is_slash = false;
4837 jboolean not_first_ch = false;
4838
4839 for (p = name; p != name + length; not_first_ch = true) {
4840 const char* old_p = p;
4841 jchar ch = *p;
4842 if (ch < 128) {
4843 p++;
4844 // quick check for ascii
4906 // be taken as a field signature. Allow "void" if void_ok.
4907 // Return a pointer to just past the signature.
4908 // Return null if no legal signature is found.
4909 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4910 bool void_ok,
4911 unsigned int length,
4912 TRAPS) const {
4913 unsigned int array_dim = 0;
4914 while (length > 0) {
4915 switch (signature[0]) {
4916 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4917 case JVM_SIGNATURE_BOOLEAN:
4918 case JVM_SIGNATURE_BYTE:
4919 case JVM_SIGNATURE_CHAR:
4920 case JVM_SIGNATURE_SHORT:
4921 case JVM_SIGNATURE_INT:
4922 case JVM_SIGNATURE_FLOAT:
4923 case JVM_SIGNATURE_LONG:
4924 case JVM_SIGNATURE_DOUBLE:
4925 return signature + 1;
4926 case JVM_SIGNATURE_CLASS:
4927 {
4928 if (_major_version < JAVA_1_5_VERSION) {
4929 signature++;
4930 length--;
4931 // Skip over the class name if one is there
4932 const char* const p = skip_over_field_name(signature, true, length);
4933 assert(p == nullptr || p > signature, "must parse one character at least");
4934 // The next character better be a semicolon
4935 if (p != nullptr && // Parse of field name succeeded.
4936 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4937 p[0] == JVM_SIGNATURE_ENDCLASS) {
4938 return p + 1;
4939 }
4940 }
4941 else {
4942 // Skip leading 'L' and ignore first appearance of ';'
4943 signature++;
4944 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4945 // Format check signature
4946 if (c != nullptr) {
4947 int newlen = pointer_delta_as_int(c, (char*) signature);
5072 } else {
5073 // 4881221: relax the constraints based on JSR202 spec
5074 legal = verify_unqualified_name(bytes, length, LegalMethod);
5075 }
5076 }
5077
5078 if (!legal) {
5079 ResourceMark rm(THREAD);
5080 assert(_class_name != nullptr, "invariant");
5081 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5082 Exceptions::fthrow(
5083 THREAD_AND_LOCATION,
5084 vmSymbols::java_lang_ClassFormatError(),
5085 "Illegal method name \"%.*s\" in class %s", length, bytes,
5086 _class_name->as_C_string()
5087 );
5088 return;
5089 }
5090 }
5091
5092 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5093 const char* const bytes = (const char*)signature->bytes();
5094 const unsigned int length = signature->utf8_length();
5095 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5096
5097 if (p == nullptr || (p - bytes) != (int)length) {
5098 return false;
5099 }
5100 return true;
5101 }
5102
5103 // Checks if signature is a legal field signature.
5104 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5105 const Symbol* signature,
5106 TRAPS) const {
5107 if (!_need_verify) { return; }
5108
5109 if (!legal_field_signature(signature, THREAD)) {
5110 CLEAR_PENDING_EXCEPTION; // throw this exception instead
5111 throwIllegalSignature("Field", name, signature, CHECK);
5112 }
5113 }
5114
5115 // Check that the signature is compatible with the method name. For example,
5116 // check that <init> has a void signature.
5117 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5118 const Symbol* signature,
5119 TRAPS) const {
5120 if (!_need_verify) {
5121 return;
5122 }
5123
5124 // Class initializers cannot have args for class format version >= 51.
5125 if (name == vmSymbols::class_initializer_name() &&
5126 signature != vmSymbols::void_method_signature() &&
5127 _major_version >= JAVA_7_VERSION) {
5128 throwIllegalSignature("Method", name, signature, THREAD);
5129 return;
5130 }
5167 length -= pointer_delta_as_int(nextp, p);
5168 p = nextp;
5169 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5170 }
5171 // The first non-signature thing better be a ')'
5172 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5173 length--;
5174 // Now we better just have a return value
5175 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5176 if (nextp && ((int)length == (nextp - p))) {
5177 return args_size;
5178 }
5179 }
5180 }
5181 // Report error
5182 throwIllegalSignature("Method", name, signature, THREAD);
5183 return 0;
5184 }
5185
5186 int ClassFileParser::static_field_size() const {
5187 assert(_layout_info != nullptr, "invariant");
5188 return _layout_info->_static_field_size;
5189 }
5190
5191 int ClassFileParser::total_oop_map_count() const {
5192 assert(_layout_info != nullptr, "invariant");
5193 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5194 }
5195
5196 jint ClassFileParser::layout_size() const {
5197 assert(_layout_info != nullptr, "invariant");
5198 return _layout_info->_instance_size;
5199 }
5200
5201 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5202 const Array<Method*>* methods) {
5203 assert(ik != nullptr, "invariant");
5204 assert(methods != nullptr, "invariant");
5205
5206 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5207 // (We used to do this lazily, but now we query it in Rewriter,
5208 // which is eagerly done for every method, so we might as well do it now,
5209 // when everything is fresh in memory.)
5210 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5211
5212 if (klass_id != vmSymbolID::NO_SID) {
5213 for (int j = 0; j < methods->length(); ++j) {
5214 Method* method = methods->at(j);
5215 method->init_intrinsic_id(klass_id);
5216
5217 if (CheckIntrinsics) {
5218 // Check if an intrinsic is defined for method 'method',
5293 }
5294 }
5295
5296 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5297 const ClassInstanceInfo& cl_inst_info,
5298 TRAPS) {
5299 if (_klass != nullptr) {
5300 return _klass;
5301 }
5302
5303 InstanceKlass* const ik =
5304 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5305
5306 if (is_hidden()) {
5307 mangle_hidden_class_name(ik);
5308 }
5309
5310 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5311
5312 assert(_klass == ik, "invariant");
5313 return ik;
5314 }
5315
5316 void ClassFileParser::create_acmp_maps(InstanceKlass* ik, TRAPS) {
5317 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5318 // Current format of acmp maps:
5319 // All maps are stored contiguously in a single int array because it might
5320 // be too early to instantiate an Object array (to be investigated)
5321 // Format is:
5322 // [number_of_nonoop_entries][offset0][size0][offset1][size1]...[oop_offset0][oop_offset1]...
5323 // ^ ^
5324 // | |
5325 // --------------------- Pair of integer describing a segment of
5326 // contiguous non-oop fields
5327 // First element is the number of segment of contiguous non-oop fields
5328 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5329 // the offset then the size.
5330 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5331 // per oop field, containing the offset of the field.
5332 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5333 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5334 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1;
5335
5336 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK);
5337 typeArrayHandle map_h(THREAD, map);
5338 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK);
5339
5340 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5341 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length());
5342 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5343 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5344 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5345
5346 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data.
5347 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5348 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5349 }
5350 int oop_map_start = nonoop_acmp_map_size + 1;
5351 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5352 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5353 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5354 }
5355 assert(acmp_maps_array->length() == map_h->length(), "sanity");
5356 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5357 ik->set_acmp_maps_array(acmp_maps_array);
5358 }
5359
5360 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5361 bool changed_by_loadhook,
5362 const ClassInstanceInfo& cl_inst_info,
5363 TRAPS) {
5364 assert(ik != nullptr, "invariant");
5365
5366 // Set name and CLD before adding to CLD
5367 ik->set_class_loader_data(_loader_data);
5368 ik->set_class_loader_type();
5369 ik->set_name(_class_name);
5370
5371 // Add all classes to our internal class loader list here,
5372 // including classes in the bootstrap (null) class loader.
5373 const bool publicize = !is_internal();
5374
5375 _loader_data->add_class(ik, publicize);
5376
5377 set_klass_to_deallocate(ik);
5378
5379 assert(_layout_info != nullptr, "invariant");
5380 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5381 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5382 "sanity");
5383
5384 assert(ik->is_instance_klass(), "sanity");
5385 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5386
5387 // Fill in information already parsed
5388 ik->set_should_verify_class(_need_verify);
5389
5390 // Not yet: supers are done below to support the new subtype-checking fields
5391 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5392 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5393 ik->set_has_strict_static_fields(_has_strict_static_fields);
5394
5395 if (_layout_info->_is_naturally_atomic) {
5396 ik->set_is_naturally_atomic();
5397 }
5398
5399 if (_layout_info->_must_be_atomic) {
5400 ik->set_must_be_atomic();
5401 }
5402
5403 ik->set_static_oop_field_count(_static_oop_count);
5404
5405 // this transfers ownership of a lot of arrays from
5406 // the parser onto the InstanceKlass*
5407 apply_parsed_class_metadata(ik, _java_fields_count);
5408
5409 // can only set dynamic nest-host after static nest information is set
5410 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5411 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5412 }
5413
5414 // note that is not safe to use the fields in the parser from this point on
5415 assert(nullptr == _cp, "invariant");
5416 assert(nullptr == _fieldinfo_stream, "invariant");
5417 assert(nullptr == _fieldinfo_search_table, "invariant");
5418 assert(nullptr == _fields_status, "invariant");
5419 assert(nullptr == _methods, "invariant");
5420 assert(nullptr == _inner_classes, "invariant");
5421 assert(nullptr == _nest_members, "invariant");
5422 assert(nullptr == _loadable_descriptors, "invariant");
5423 assert(nullptr == _combined_annotations, "invariant");
5424 assert(nullptr == _record_components, "invariant");
5425 assert(nullptr == _permitted_subclasses, "invariant");
5426 assert(nullptr == _inline_layout_info_array, "invariant");
5427
5428 if (_has_localvariable_table) {
5429 ik->set_has_localvariable_table(true);
5430 }
5431
5432 if (_has_final_method) {
5433 ik->set_has_final_method();
5434 }
5435
5436 ik->copy_method_ordering(_method_ordering, CHECK);
5437 // The InstanceKlass::_methods_jmethod_ids cache
5438 // is managed on the assumption that the initial cache
5439 // size is equal to the number of methods in the class. If
5440 // that changes, then InstanceKlass::idnum_can_increment()
5441 // has to be changed accordingly.
5442 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5443
5444 ik->set_this_class_index(_this_class_index);
5445
5446 if (_is_hidden) {
5483 if ((_num_miranda_methods > 0) ||
5484 // if this class introduced new miranda methods or
5485 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5486 // super class exists and this class inherited miranda methods
5487 ) {
5488 ik->set_has_miranda_methods(); // then set a flag
5489 }
5490
5491 // Fill in information needed to compute superclasses.
5492 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5493 ik->set_transitive_interfaces(_transitive_interfaces);
5494 ik->set_local_interfaces(_local_interfaces);
5495 _transitive_interfaces = nullptr;
5496 _local_interfaces = nullptr;
5497
5498 // Initialize itable offset tables
5499 klassItable::setup_itable_offset_table(ik);
5500
5501 // Compute transitive closure of interfaces this class implements
5502 // Do final class setup
5503 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5504 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5505 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5506 }
5507
5508 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5509 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5510 ik->set_has_contended_annotations(true);
5511 }
5512
5513 // Fill in has_finalizer and layout_helper
5514 set_precomputed_flags(ik);
5515
5516 // check if this class can access its super class
5517 check_super_class_access(ik, CHECK);
5518
5519 // check if this class can access its superinterfaces
5520 check_super_interface_access(ik, CHECK);
5521
5522 // check if this class overrides any final method
5523 check_final_method_override(ik, CHECK);
5544
5545 assert(_all_mirandas != nullptr, "invariant");
5546
5547 // Generate any default methods - default methods are public interface methods
5548 // that have a default implementation. This is new with Java 8.
5549 if (_has_nonstatic_concrete_methods) {
5550 DefaultMethods::generate_default_methods(ik,
5551 _all_mirandas,
5552 CHECK);
5553 }
5554
5555 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5556 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5557 !module_entry->has_default_read_edges()) {
5558 if (!module_entry->set_has_default_read_edges()) {
5559 // We won a potential race
5560 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5561 }
5562 }
5563
5564 if (is_inline_type()) {
5565 InlineKlass* vk = InlineKlass::cast(ik);
5566 vk->set_payload_alignment(_layout_info->_payload_alignment);
5567 vk->set_payload_offset(_layout_info->_payload_offset);
5568 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5569 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5570 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5571 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5572 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5573 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5574 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5575 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5576 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5577 vk->initialize_calling_convention(CHECK);
5578 }
5579
5580 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5581 && _class_name != vmSymbols::java_lang_Object()) {
5582 // Both abstract and concrete value classes need a field map for acmp
5583 create_acmp_maps(ik, CHECK);
5584 }
5585
5586 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5587
5588 if (!is_internal()) {
5589 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5590
5591 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5592 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5593 log_is_enabled(Info, class, preview)) {
5594 ResourceMark rm;
5595 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5596 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5597 }
5598
5599 if (log_is_enabled(Debug, class, resolve)) {
5600 ResourceMark rm;
5601 // print out the superclass.
5602 const char * from = ik->external_name();
5603 if (ik->super() != nullptr) {
5604 log_debug(class, resolve)("%s %s (super)",
5605 from,
5646 const ClassLoadInfo* cl_info,
5647 Publicity pub_level,
5648 TRAPS) :
5649 _stream(stream),
5650 _class_name(nullptr),
5651 _loader_data(loader_data),
5652 _is_hidden(cl_info->is_hidden()),
5653 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5654 _orig_cp_size(0),
5655 _static_oop_count(0),
5656 _super_klass(),
5657 _cp(nullptr),
5658 _fieldinfo_stream(nullptr),
5659 _fieldinfo_search_table(nullptr),
5660 _fields_status(nullptr),
5661 _methods(nullptr),
5662 _inner_classes(nullptr),
5663 _nest_members(nullptr),
5664 _nest_host(0),
5665 _permitted_subclasses(nullptr),
5666 _loadable_descriptors(nullptr),
5667 _record_components(nullptr),
5668 _local_interfaces(nullptr),
5669 _transitive_interfaces(nullptr),
5670 _combined_annotations(nullptr),
5671 _class_annotations(nullptr),
5672 _class_type_annotations(nullptr),
5673 _fields_annotations(nullptr),
5674 _fields_type_annotations(nullptr),
5675 _klass(nullptr),
5676 _klass_to_deallocate(nullptr),
5677 _parsed_annotations(nullptr),
5678 _layout_info(nullptr),
5679 _inline_layout_info_array(nullptr),
5680 _temp_field_info(nullptr),
5681 _method_ordering(nullptr),
5682 _all_mirandas(nullptr),
5683 _vtable_size(0),
5684 _itable_size(0),
5685 _num_miranda_methods(0),
5686 _protection_domain(cl_info->protection_domain()),
5687 _access_flags(),
5688 _pub_level(pub_level),
5689 _bad_constant_seen(0),
5690 _synthetic_flag(false),
5691 _sde_length(false),
5692 _sde_buffer(nullptr),
5693 _sourcefile_index(0),
5694 _generic_signature_index(0),
5695 _major_version(0),
5696 _minor_version(0),
5697 _this_class_index(0),
5698 _super_class_index(0),
5699 _itfs_len(0),
5700 _java_fields_count(0),
5701 _need_verify(false),
5702 _has_nonstatic_concrete_methods(false),
5703 _declares_nonstatic_concrete_methods(false),
5704 _has_localvariable_table(false),
5705 _has_final_method(false),
5706 _has_contended_fields(false),
5707 _has_aot_runtime_setup_method(false),
5708 _has_strict_static_fields(false),
5709 _is_naturally_atomic(false),
5710 _must_be_atomic(true),
5711 _has_loosely_consistent_annotation(false),
5712 _has_finalizer(false),
5713 _has_empty_finalizer(false),
5714 _max_bootstrap_specifier_index(-1) {
5715
5716 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5717 _class_name->increment_refcount();
5718
5719 assert(_loader_data != nullptr, "invariant");
5720 assert(stream != nullptr, "invariant");
5721 assert(_stream != nullptr, "invariant");
5722 assert(_stream->buffer() == _stream->current(), "invariant");
5723 assert(_class_name != nullptr, "invariant");
5724 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5725
5726 // Figure out whether we can skip format checking (matching classic VM behavior)
5727 // Always verify CFLH bytes from the user agents.
5728 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5729
5730 // synch back verification state to stream to check for truncation.
5731 stream->set_need_verify(_need_verify);
5732
5733 parse_stream(stream, CHECK);
5734
5735 post_process_parsed_stream(stream, _cp, CHECK);
5736 }
5737
5738 void ClassFileParser::clear_class_metadata() {
5739 // metadata created before the instance klass is created. Must be
5740 // deallocated if classfile parsing returns an error.
5741 _cp = nullptr;
5742 _fieldinfo_stream = nullptr;
5743 _fieldinfo_search_table = nullptr;
5744 _fields_status = nullptr;
5745 _methods = nullptr;
5746 _inner_classes = nullptr;
5747 _nest_members = nullptr;
5748 _permitted_subclasses = nullptr;
5749 _loadable_descriptors = nullptr;
5750 _combined_annotations = nullptr;
5751 _class_annotations = _class_type_annotations = nullptr;
5752 _fields_annotations = _fields_type_annotations = nullptr;
5753 _record_components = nullptr;
5754 _inline_layout_info_array = nullptr;
5755 }
5756
5757 // Destructor to clean up
5758 ClassFileParser::~ClassFileParser() {
5759 _class_name->decrement_refcount();
5760
5761 if (_cp != nullptr) {
5762 MetadataFactory::free_metadata(_loader_data, _cp);
5763 }
5764
5765 if (_fieldinfo_stream != nullptr) {
5766 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5767 }
5768 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5769
5770 if (_fields_status != nullptr) {
5771 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5772 }
5773
5774 if (_inline_layout_info_array != nullptr) {
5775 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5776 }
5777
5778 if (_methods != nullptr) {
5779 // Free methods
5780 InstanceKlass::deallocate_methods(_loader_data, _methods);
5781 }
5782
5783 // beware of the Universe::empty_blah_array!!
5784 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5785 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5786 }
5787
5788 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5789 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5790 }
5791
5792 if (_record_components != nullptr) {
5793 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5794 }
5795
5796 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5797 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5798 }
5799
5800 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5801 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5802 }
5803
5804 // Free interfaces
5805 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5806 _local_interfaces, _transitive_interfaces);
5807
5808 if (_combined_annotations != nullptr) {
5809 // After all annotations arrays have been created, they are installed into the
5810 // Annotations object that will be assigned to the InstanceKlass being created.
5811
5812 // Deallocate the Annotations object and the installed annotations arrays.
5813 _combined_annotations->deallocate_contents(_loader_data);
5814
5815 // If the _combined_annotations pointer is non-null,
5816 // then the other annotations fields should have been cleared.
5817 assert(_class_annotations == nullptr, "Should have been cleared");
5818 assert(_class_type_annotations == nullptr, "Should have been cleared");
5819 assert(_fields_annotations == nullptr, "Should have been cleared");
5820 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5821 } else {
5822 // If the annotations arrays were not installed into the Annotations object,
5823 // then they have to be deallocated explicitly.
5883
5884 assert(cp_size == (u2)cp->length(), "invariant");
5885
5886 // ACCESS FLAGS
5887 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5888
5889 // Access flags
5890 u2 flags;
5891 // JVM_ACC_MODULE is defined in JDK-9 and later.
5892 if (_major_version >= JAVA_9_VERSION) {
5893 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5894 } else {
5895 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5896 }
5897
5898 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5899 // Set abstract bit for old class files for backward compatibility
5900 flags |= JVM_ACC_ABSTRACT;
5901 }
5902
5903 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5904 if (!supports_inline_types()) {
5905 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5906 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5907 if (!is_module && !is_interface) {
5908 flags |= JVM_ACC_IDENTITY;
5909 }
5910 }
5911
5912 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5913
5914 short bad_constant = class_bad_constant_seen();
5915 if (bad_constant != 0) {
5916 // Do not throw CFE until after the access_flags are checked because if
5917 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5918 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5919 return;
5920 }
5921
5922 _access_flags.set_flags(flags);
5923
5924 // This class and superclass
5925 _this_class_index = stream->get_u2_fast();
5926 guarantee_property(
5927 valid_cp_range(_this_class_index, cp_size) &&
5928 cp->tag_at(_this_class_index).is_unresolved_klass(),
5929 "Invalid this class index %u in constant pool in class file %s",
5930 _this_class_index, CHECK);
5931
5999
6000 // SUPERKLASS
6001 _super_class_index = stream->get_u2_fast();
6002 check_super_class(cp,
6003 _super_class_index,
6004 _need_verify,
6005 CHECK);
6006
6007 // Interfaces
6008 _itfs_len = stream->get_u2_fast();
6009 parse_interfaces(stream,
6010 _itfs_len,
6011 cp,
6012 &_has_nonstatic_concrete_methods,
6013 CHECK);
6014
6015 assert(_local_interfaces != nullptr, "invariant");
6016
6017 // Fields (offsets are filled in later)
6018 parse_fields(stream,
6019 _access_flags,
6020 cp,
6021 cp_size,
6022 &_java_fields_count,
6023 CHECK);
6024
6025 assert(_temp_field_info != nullptr, "invariant");
6026
6027 // Methods
6028 parse_methods(stream,
6029 _access_flags.is_interface(),
6030 &_has_localvariable_table,
6031 &_has_final_method,
6032 &_declares_nonstatic_concrete_methods,
6033 CHECK);
6034
6035 assert(_methods != nullptr, "invariant");
6036
6037 if (_declares_nonstatic_concrete_methods) {
6038 _has_nonstatic_concrete_methods = true;
6039 }
6119 // errors not checked yet.
6120 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6121 "Interfaces must have java.lang.Object as superclass in class file %s",
6122 CHECK);
6123 }
6124 Handle loader(THREAD, _loader_data->class_loader());
6125 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6126 // fast path to avoid lookup
6127 _super_klass = vmClasses::Object_klass();
6128 } else {
6129 _super_klass = (const InstanceKlass*)
6130 SystemDictionary::resolve_super_or_fail(_class_name,
6131 super_class_name,
6132 loader,
6133 true,
6134 CHECK);
6135 }
6136 }
6137
6138 if (_super_klass != nullptr) {
6139 if (_super_klass->is_interface()) {
6140 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6141 return;
6142 }
6143
6144 if (_super_klass->is_final()) {
6145 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6146 return;
6147 }
6148
6149 if (Arguments::is_valhalla_enabled()) {
6150 // If this class is an value class, its super class cannot be an identity class unless it is java.lang.Object.
6151 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() &&
6152 _super_klass != vmClasses::Object_klass()) {
6153 ResourceMark rm(THREAD);
6154 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6155 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string()));
6156 }
6157 }
6158
6159 if (_super_klass->has_nonstatic_concrete_methods()) {
6160 _has_nonstatic_concrete_methods = true;
6161 }
6162 }
6163
6164 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6165 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6166 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6167 _class_name->as_klass_external_name()));
6168 }
6169
6170 // Determining if the class allows tearing or not (default is not)
6171 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6172 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6173 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6174 // Conditions above are not sufficient to determine atomicity requirements,
6175 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6176 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6177 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6178 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6179 _must_be_atomic = false;
6180 }
6181 // Apply VM options override
6182 if (*ForceNonTearable != '\0') {
6183 // Allow a command line switch to force the same atomicity property:
6184 const char* class_name_str = _class_name->as_C_string();
6185 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6186 _must_be_atomic = true;
6187 }
6188 }
6189 }
6190
6191 // Compute the transitive list of all unique interfaces implemented by this class
6192 _transitive_interfaces =
6193 compute_transitive_interfaces(_super_klass,
6194 _local_interfaces,
6195 _loader_data,
6196 CHECK);
6197
6198 assert(_transitive_interfaces != nullptr, "invariant");
6199
6200 // sort methods
6201 _method_ordering = sort_methods(_methods);
6202
6203 _all_mirandas = new GrowableArray<Method*>(20);
6204
6205 Handle loader(THREAD, _loader_data->class_loader());
6206 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6207 &_num_miranda_methods,
6208 _all_mirandas,
6209 _super_klass,
6210 _methods,
6211 _access_flags,
6212 _major_version,
6213 loader,
6214 _class_name,
6215 _local_interfaces);
6216
6217 // Size of Java itable (in words)
6218 _itable_size = is_interface() ? 0 :
6219 klassItable::compute_itable_size(_transitive_interfaces);
6220
6221 assert(_parsed_annotations != nullptr, "invariant");
6222
6223 if (Arguments::is_valhalla_enabled()) {
6224 fetch_field_classes(cp, CHECK);
6225 }
6226
6227 _layout_info = new FieldLayoutInfo();
6228 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6229 _parsed_annotations->is_contended(), is_inline_type(),
6230 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6231 _must_be_atomic, _layout_info, _inline_layout_info_array);
6232 lb.build_layout();
6233
6234 // If it turned out that we didn't inline any of the fields, we deallocate
6235 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6236 // transferred to the allocated InstanceKlass.
6237 if (_inline_layout_info_array != nullptr && !_layout_info->_has_inlined_fields) {
6238 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6239 _inline_layout_info_array = nullptr;
6240 }
6241
6242 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6243 _fieldinfo_stream =
6244 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6245 injected_fields_count, loader_data(), CHECK);
6246 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6247 _fields_status =
6248 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6249 FieldStatus(0), CHECK);
6250
6251 // Strict static fields track initialization status from the beginning of time.
6252 // After this class runs <clinit>, they will be verified as being "not unset".
6253 // See Step 8 of InstanceKlass::initialize_impl.
6254 if (_has_strict_static_fields) {
6255 bool found_one = false;
6256 for (int i = 0; i < _temp_field_info->length(); i++) {
6257 FieldInfo& fi = *_temp_field_info->adr_at(i);
6258 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6259 found_one = true;
6260 if (fi.initializer_index() != 0) {
6261 // skip strict static fields with ConstantValue attributes
6262 } else {
6263 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6264 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6265 }
6266 }
6267 }
6268 assert(found_one == _has_strict_static_fields,
6269 "correct prediction = %d", (int)_has_strict_static_fields);
6270 }
6271 }
6272
6273 // In order to be able to optimize fields layouts by applying heap flattening,
6274 // the JVM needs to know the layout of the class of the fields, which implies
6275 // having these classes loaded. The strategy has two folds:
6276 // 1 - if the current class has a LoadableDescriptors attribute containing the
6277 // name of the class of the field and PreloadClasses is true, the JVM will
6278 // try to speculatively load this class. Failures to load the class are
6279 // silently discarded, and loadings resulting in a non-optimizable class
6280 // are ignored
6281 // 2 - if step 1 cannot be applied, the JVM will simply check if the class
6282 // loader of the current class already knows these classes (no class
6283 // loading triggered in this case). Note that the migrated value classes
6284 // of the JDK are automatically registered to all class loaders, and
6285 // are guaranteed to be found in this step even if the current class
6286 // has not been recompiled with JEP 401 features enabled
6287 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) {
6288 for (FieldInfo fieldinfo : *_temp_field_info) {
6289 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6290 Symbol* sig = fieldinfo.signature(cp);
6291 if (Signature::has_envelope(sig)) {
6292 TempNewSymbol name = Signature::strip_envelope(sig);
6293 if (name == _class_name) continue;
6294 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) {
6295 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6296 "Cause: field type in LoadableDescriptors attribute",
6297 name->as_C_string(), _class_name->as_C_string());
6298 oop loader = loader_data()->class_loader();
6299 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6300 Handle(THREAD, loader),
6301 false, THREAD);
6302
6303 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6304
6305 if (klass != nullptr) {
6306 if (klass->is_inline_klass()) {
6307 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6308 log_info(class, preload)("Preloading of class %s during loading of class %s "
6309 "(cause: field type in LoadableDescriptors attribute) succeeded",
6310 name->as_C_string(), _class_name->as_C_string());
6311 } else {
6312 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log this
6313 log_info(class, preload)("Preloading of class %s during loading of class %s "
6314 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6315 name->as_C_string(), _class_name->as_C_string());
6316 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6317 log_warning(class, preload)("After preloading of class %s during loading of class %s "
6318 "field was annotated with @NullRestricted but loaded class is not a value class, "
6319 "the annotation is ignored",
6320 name->as_C_string(), _class_name->as_C_string());
6321 fieldinfo.field_flags().update_null_free_inline_type(false);
6322 }
6323 }
6324 } else {
6325 log_info(class, preload)("Preloading of class %s during loading of class %s "
6326 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6327 name->as_C_string(), _class_name->as_C_string(),
6328 PENDING_EXCEPTION->klass()->name()->as_C_string());
6329 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6330 log_warning(class, preload)("After preloading of class %s during loading of class %s failed,"
6331 "field was annotated with @NullRestricted but class is unknown, "
6332 "the annotation is ignored",
6333 name->as_C_string(), _class_name->as_C_string());
6334 fieldinfo.field_flags().update_null_free_inline_type(false);
6335 }
6336
6337 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6338 // impact loading of current class.
6339 CLEAR_PENDING_EXCEPTION;
6340 }
6341 } else {
6342 oop loader = loader_data()->class_loader();
6343 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6344 if (klass != nullptr && klass->is_inline_klass()) {
6345 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6346 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary"
6347 "(field type not in LoadableDescriptors attribute)",
6348 _class_name->as_C_string(), name->as_C_string());
6349 } else if (fieldinfo.field_flags().is_null_free_inline_type()) {
6350 if (klass == nullptr) {
6351 log_warning(class, preload)("During loading of class %s, class %s is unknown, "
6352 "but a field of this type was annotated with @NullRestricted, "
6353 "the annotation is ignored",
6354 _class_name->as_C_string(), name->as_C_string());
6355 } else {
6356 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary "
6357 "and is not a concrete value class, but a field of this type was annotated with "
6358 "@NullRestricted, the annotation is ignored",
6359 _class_name->as_C_string(), name->as_C_string());
6360 }
6361 fieldinfo.field_flags().update_null_free_inline_type(false);
6362 }
6363 }
6364 }
6365 }
6366 }
6367
6368 void ClassFileParser::set_klass(InstanceKlass* klass) {
6369
6370 #ifdef ASSERT
6371 if (klass != nullptr) {
6372 assert(nullptr == _klass, "leaking?");
6373 }
6374 #endif
6375
6376 _klass = klass;
6377 }
6378
6379 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6380 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6381
6382 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6383 // never allocated for an InstanceKlass which has no need for this information.
6384 if (_inline_layout_info_array == nullptr) {
6385 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6386 java_fields_count(),
6387 CHECK);
6388 }
6389
6390 // Set the Klass for the field's index
6391 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6392 }
6393
6394 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6395
6396 #ifdef ASSERT
6397 if (klass != nullptr) {
6398 assert(nullptr == _klass_to_deallocate, "leaking?");
6399 }
6400 #endif
6401
6402 _klass_to_deallocate = klass;
6403 }
6404
6405 // Caller responsible for ResourceMark
6406 // clone stream with rewound position
6407 const ClassFileStream* ClassFileParser::clone_stream() const {
6408 assert(_stream != nullptr, "invariant");
6409
6410 return _stream->clone();
6411 }
6412
6413 ReferenceType ClassFileParser::super_reference_type() const {
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