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/systemDictionaryShared.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/instanceKlass.inline.hpp"
56 #include "oops/instanceMirrorKlass.hpp"
57 #include "oops/klass.inline.hpp"
58 #include "oops/klassVtable.hpp"
59 #include "oops/metadata.hpp"
60 #include "oops/method.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/recordComponent.hpp"
63 #include "oops/symbol.hpp"
64 #include "prims/jvmtiExport.hpp"
65 #include "prims/jvmtiThreadState.hpp"
66 #include "runtime/arguments.hpp"
67 #include "runtime/fieldDescriptor.inline.hpp"
68 #include "runtime/handles.inline.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/os.hpp"
71 #include "runtime/perfData.hpp"
72 #include "runtime/reflection.hpp"
73 #include "runtime/safepointVerifiers.hpp"
74 #include "runtime/signature.hpp"
75 #include "runtime/timer.hpp"
76 #include "services/classLoadingService.hpp"
77 #include "services/threadService.hpp"
78 #include "utilities/align.hpp"
79 #include "utilities/bitMap.inline.hpp"
80 #include "utilities/checkedCast.hpp"
81 #include "utilities/copy.hpp"
82 #include "utilities/exceptions.hpp"
83 #include "utilities/formatBuffer.hpp"
84 #include "utilities/globalDefinitions.hpp"
85 #include "utilities/growableArray.hpp"
86 #include "utilities/hashTable.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/ostream.hpp"
89 #include "utilities/utf8.hpp"
90
91 // We generally try to create the oops directly when parsing, rather than
92 // allocating temporary data structures and copying the bytes twice. A
93 // temporary area is only needed when parsing utf8 entries in the constant
94 // pool and when parsing line number tables.
95
96 // We add assert in debug mode when class format is not checked.
97
98 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
99 #define JAVA_MIN_SUPPORTED_VERSION 45
100 #define JAVA_PREVIEW_MINOR_VERSION 65535
101
102 // Used for two backward compatibility reasons:
103 // - to check for new additions to the class file format in JDK1.5
104 // - to check for bug fixes in the format checker in JDK1.5
105 #define JAVA_1_5_VERSION 49
106
107 // Used for backward compatibility reasons:
108 // - to check for javac bug fixes that happened after 1.5
479 guarantee_property(valid_symbol_at(name_ref_index),
480 "Invalid constant pool index %u in class file %s",
481 name_ref_index, CHECK);
482 guarantee_property(valid_symbol_at(signature_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 signature_ref_index, CHECK);
485 break;
486 }
487 case JVM_CONSTANT_Utf8:
488 break;
489 case JVM_CONSTANT_UnresolvedClass: // fall-through
490 case JVM_CONSTANT_UnresolvedClassInError: {
491 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
492 break;
493 }
494 case JVM_CONSTANT_ClassIndex: {
495 const int class_index = cp->klass_index_at(index);
496 guarantee_property(valid_symbol_at(class_index),
497 "Invalid constant pool index %u in class file %s",
498 class_index, CHECK);
499 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
500 break;
501 }
502 case JVM_CONSTANT_StringIndex: {
503 const int string_index = cp->string_index_at(index);
504 guarantee_property(valid_symbol_at(string_index),
505 "Invalid constant pool index %u in class file %s",
506 string_index, CHECK);
507 Symbol* const sym = cp->symbol_at(string_index);
508 cp->unresolved_string_at_put(index, sym);
509 break;
510 }
511 case JVM_CONSTANT_MethodHandle: {
512 const int ref_index = cp->method_handle_index_at(index);
513 guarantee_property(valid_cp_range(ref_index, length),
514 "Invalid constant pool index %u in class file %s",
515 ref_index, CHECK);
516 const constantTag tag = cp->tag_at(ref_index);
517 const int ref_kind = cp->method_handle_ref_kind_at(index);
518
920 class AnnotationCollector : public ResourceObj{
921 public:
922 enum Location { _in_field, _in_method, _in_class };
923 enum ID {
924 _unknown = 0,
925 _method_CallerSensitive,
926 _method_ForceInline,
927 _method_DontInline,
928 _method_ChangesCurrentThread,
929 _method_JvmtiHideEvents,
930 _method_JvmtiMountTransition,
931 _method_InjectedProfile,
932 _method_LambdaForm_Compiled,
933 _method_Hidden,
934 _method_Scoped,
935 _method_IntrinsicCandidate,
936 _jdk_internal_vm_annotation_Contended,
937 _field_Stable,
938 _jdk_internal_vm_annotation_ReservedStackAccess,
939 _jdk_internal_ValueBased,
940 _java_lang_Deprecated,
941 _java_lang_Deprecated_for_removal,
942 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
943 _method_AOTRuntimeSetup,
944 _jdk_internal_vm_annotation_TrustFinalFields,
945 _annotation_LIMIT
946 };
947 const Location _location;
948 int _annotations_present;
949 u2 _contended_group;
950
951 AnnotationCollector(Location location)
952 : _location(location), _annotations_present(0), _contended_group(0)
953 {
954 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
955 }
956 // If this annotation name has an ID, report it (or _none).
957 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
958 // Set the annotation name:
959 void set_annotation(ID id) {
1354 }
1355
1356 *constantvalue_index_addr = constantvalue_index;
1357 *is_synthetic_addr = is_synthetic;
1358 *generic_signature_index_addr = generic_signature_index;
1359 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1360 runtime_visible_annotations_length,
1361 CHECK);
1362 parsed_annotations->set_field_annotations(a);
1363 a = allocate_annotations(runtime_visible_type_annotations,
1364 runtime_visible_type_annotations_length,
1365 CHECK);
1366 parsed_annotations->set_field_type_annotations(a);
1367 return;
1368 }
1369
1370
1371 // Side-effects: populates the _fields, _fields_annotations,
1372 // _fields_type_annotations fields
1373 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1374 bool is_interface,
1375 ConstantPool* cp,
1376 const int cp_size,
1377 u2* const java_fields_count_ptr,
1378 TRAPS) {
1379
1380 assert(cfs != nullptr, "invariant");
1381 assert(cp != nullptr, "invariant");
1382 assert(java_fields_count_ptr != nullptr, "invariant");
1383
1384 assert(nullptr == _fields_annotations, "invariant");
1385 assert(nullptr == _fields_type_annotations, "invariant");
1386
1387 cfs->guarantee_more(2, CHECK); // length
1388 const u2 length = cfs->get_u2_fast();
1389 *java_fields_count_ptr = length;
1390
1391 int num_injected = 0;
1392 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1393 &num_injected);
1394 const int total_fields = length + num_injected;
1395
1396 // Allocate a temporary resource array to collect field data.
1397 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1398 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1399
1400 ResourceMark rm(THREAD);
1401 for (int n = 0; n < length; n++) {
1402 // access_flags, name_index, descriptor_index, attributes_count
1403 cfs->guarantee_more(8, CHECK);
1404
1405 AccessFlags access_flags;
1406 const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1407 verify_legal_field_modifiers(flags, is_interface, CHECK);
1408 access_flags.set_flags(flags);
1409 FieldInfo::FieldFlags fieldFlags(0);
1410
1411 const u2 name_index = cfs->get_u2_fast();
1412 guarantee_property(valid_symbol_at(name_index),
1413 "Invalid constant pool index %u for field name in class file %s",
1414 name_index, CHECK);
1415 const Symbol* const name = cp->symbol_at(name_index);
1416 verify_legal_field_name(name, CHECK);
1417
1418 const u2 signature_index = cfs->get_u2_fast();
1419 guarantee_property(valid_symbol_at(signature_index),
1420 "Invalid constant pool index %u for field signature in class file %s",
1421 signature_index, CHECK);
1422 const Symbol* const sig = cp->symbol_at(signature_index);
1423 verify_legal_field_signature(name, sig, CHECK);
1424
1425 u2 constantvalue_index = 0;
1426 bool is_synthetic = false;
1427 u2 generic_signature_index = 0;
1428 const bool is_static = access_flags.is_static();
1429 FieldAnnotationCollector parsed_annotations(_loader_data);
1430
1431 const u2 attributes_count = cfs->get_u2_fast();
1432 if (attributes_count > 0) {
1433 parse_field_attributes(cfs,
1434 attributes_count,
1435 is_static,
1436 signature_index,
1437 &constantvalue_index,
1438 &is_synthetic,
1439 &generic_signature_index,
1440 &parsed_annotations,
1441 CHECK);
1442
1443 if (parsed_annotations.field_annotations() != nullptr) {
1444 if (_fields_annotations == nullptr) {
1445 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1446 _loader_data, length, nullptr,
1447 CHECK);
1448 }
1449 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1450 parsed_annotations.set_field_annotations(nullptr);
1451 }
1452 if (parsed_annotations.field_type_annotations() != nullptr) {
1453 if (_fields_type_annotations == nullptr) {
1454 _fields_type_annotations =
1455 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1456 length,
1457 nullptr,
1458 CHECK);
1459 }
1460 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1461 parsed_annotations.set_field_type_annotations(nullptr);
1462 }
1463
1464 if (is_synthetic) {
1465 access_flags.set_is_synthetic();
1466 }
1467 if (generic_signature_index != 0) {
1468 fieldFlags.update_generic(true);
1469 }
1470 }
1471
1472 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1473
1474 // Update number of static oop fields.
1475 if (is_static && is_reference_type(type)) {
1476 _static_oop_count++;
1477 }
1478
1479 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1480 fi.set_index(n);
1481 if (fieldFlags.is_generic()) {
1482 fi.set_generic_signature_index(generic_signature_index);
1483 }
1484 parsed_annotations.apply_to(&fi);
1485 if (fi.field_flags().is_contended()) {
1486 _has_contended_fields = true;
1487 }
1488 _temp_field_info->append(fi);
1489 }
1490 assert(_temp_field_info->length() == length, "Must be");
1491
1492 int index = length;
1493 if (num_injected != 0) {
1494 for (int n = 0; n < num_injected; n++) {
1495 // Check for duplicates
1496 if (injected[n].may_be_java) {
1497 const Symbol* const name = injected[n].name();
1498 const Symbol* const signature = injected[n].signature();
1499 bool duplicate = false;
1500 for (int i = 0; i < length; i++) {
1501 const FieldInfo* const f = _temp_field_info->adr_at(i);
1502 if (name == cp->symbol_at(f->name_index()) &&
1503 signature == cp->symbol_at(f->signature_index())) {
1504 // Symbol is desclared in Java so skip this one
1505 duplicate = true;
1506 break;
1507 }
1508 }
1509 if (duplicate) {
1510 // These will be removed from the field array at the end
1511 continue;
1512 }
1513 }
1514
1515 // Injected field
1516 FieldInfo::FieldFlags fflags(0);
1517 fflags.update_injected(true);
1518 AccessFlags aflags;
1519 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1520 fi.set_index(index);
1521 _temp_field_info->append(fi);
1522 index++;
1523 }
1524 }
1525
1526 assert(_temp_field_info->length() == index, "Must be");
1527
1528 if (_need_verify && length > 1) {
1529 // Check duplicated fields
1530 ResourceMark rm(THREAD);
1531 // Set containing name-signature pairs
1532 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1533 for (int i = 0; i < _temp_field_info->length(); i++) {
1534 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1535 _temp_field_info->adr_at(i)->signature(_cp));
1536 // If no duplicates, add name/signature in hashtable names_and_sigs.
1537 if(!names_and_sigs->put(name_and_sig, 0)) {
1538 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1539 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1540 return;
1541 }
1542 }
1543 }
1544 }
1545
1546
1891 }
1892 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1893 if (_location != _in_field && _location != _in_class) {
1894 break; // only allow for fields and classes
1895 }
1896 if (!EnableContended || (RestrictContended && !privileged)) {
1897 break; // honor privileges
1898 }
1899 return _jdk_internal_vm_annotation_Contended;
1900 }
1901 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1902 if (_location != _in_method) break; // only allow for methods
1903 if (RestrictReservedStack && !privileged) break; // honor privileges
1904 return _jdk_internal_vm_annotation_ReservedStackAccess;
1905 }
1906 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1907 if (_location != _in_class) break; // only allow for classes
1908 if (!privileged) break; // only allow in privileged code
1909 return _jdk_internal_ValueBased;
1910 }
1911 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1912 return _java_lang_Deprecated;
1913 }
1914 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1915 if (_location != _in_class) break; // only allow for classes
1916 if (!privileged) break; // only allow in privileged code
1917 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1918 }
1919 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1920 if (_location != _in_method) break; // only allow for methods
1921 if (!privileged) break; // only allow in privileged code
1922 return _method_AOTRuntimeSetup;
1923 }
1924 default: {
1925 break;
1926 }
1927 }
1928 return AnnotationCollector::_unknown;
1929 }
1930
2171
2172 const u2 signature_index = cfs->get_u2_fast();
2173 guarantee_property(
2174 valid_symbol_at(signature_index),
2175 "Illegal constant pool index %u for method signature in class file %s",
2176 signature_index, CHECK_NULL);
2177 const Symbol* const signature = cp->symbol_at(signature_index);
2178
2179 if (name == vmSymbols::class_initializer_name()) {
2180 // We ignore the other access flags for a valid class initializer.
2181 // (JVM Spec 2nd ed., chapter 4.6)
2182 if (_major_version < 51) { // backward compatibility
2183 flags = JVM_ACC_STATIC;
2184 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2185 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2186 } else {
2187 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2188 return nullptr;
2189 }
2190 } else {
2191 verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2192 }
2193
2194 if (name == vmSymbols::object_initializer_name() && is_interface) {
2195 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2196 return nullptr;
2197 }
2198
2199 int args_size = -1; // only used when _need_verify is true
2200 if (_need_verify) {
2201 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2202 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2203 verify_legal_method_signature(name, signature, CHECK_NULL);
2204 if (args_size > MAX_ARGS_SIZE) {
2205 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2206 return nullptr;
2207 }
2208 }
2209
2210 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2211
2212 // Default values for code and exceptions attribute elements
2213 u2 max_stack = 0;
2214 u2 max_locals = 0;
2215 u4 code_length = 0;
2216 const u1* code_start = nullptr;
2217 u2 exception_table_length = 0;
2218 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
3002 valid_klass_reference_at(outer_class_info_index),
3003 "outer_class_info_index %u has bad constant type in class file %s",
3004 outer_class_info_index, CHECK_0);
3005
3006 if (outer_class_info_index != 0) {
3007 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3008 char* bytes = (char*)outer_class_name->bytes();
3009 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3010 "Outer class is an array class in class file %s", CHECK_0);
3011 }
3012 // Inner class name
3013 const u2 inner_name_index = cfs->get_u2_fast();
3014 guarantee_property(
3015 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3016 "inner_name_index %u has bad constant type in class file %s",
3017 inner_name_index, CHECK_0);
3018 if (_need_verify) {
3019 guarantee_property(inner_class_info_index != outer_class_info_index,
3020 "Class is both outer and inner class in class file %s", CHECK_0);
3021 }
3022 // Access flags
3023 u2 flags;
3024 // JVM_ACC_MODULE is defined in JDK-9 and later.
3025 if (_major_version >= JAVA_9_VERSION) {
3026 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3027 } else {
3028 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3029 }
3030 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3031 // Set abstract bit for old class files for backward compatibility
3032 flags |= JVM_ACC_ABSTRACT;
3033 }
3034
3035 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3036 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3037 AccessFlags inner_access_flags(flags);
3038
3039 inner_classes->at_put(index++, inner_class_info_index);
3040 inner_classes->at_put(index++, outer_class_info_index);
3041 inner_classes->at_put(index++, inner_name_index);
3042 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3043 }
3044
3045 // Check for circular and duplicate entries.
3046 bool has_circularity = false;
3047 if (_need_verify) {
3048 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3049 if (has_circularity) {
3050 // If circularity check failed then ignore InnerClasses attribute.
3051 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3052 index = 0;
3053 if (parsed_enclosingmethod_attribute) {
3054 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3120 if (length > 0) {
3121 int index = 0;
3122 cfs->guarantee_more(2 * length, CHECK_0);
3123 for (int n = 0; n < length; n++) {
3124 const u2 class_info_index = cfs->get_u2_fast();
3125 guarantee_property(
3126 valid_klass_reference_at(class_info_index),
3127 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3128 class_info_index, CHECK_0);
3129 permitted_subclasses->at_put(index++, class_info_index);
3130 }
3131 assert(index == size, "wrong size");
3132 }
3133
3134 // Restore buffer's current position.
3135 cfs->set_current(current_mark);
3136
3137 return length;
3138 }
3139
3140 // Record {
3141 // u2 attribute_name_index;
3142 // u4 attribute_length;
3143 // u2 components_count;
3144 // component_info components[components_count];
3145 // }
3146 // component_info {
3147 // u2 name_index;
3148 // u2 descriptor_index
3149 // u2 attributes_count;
3150 // attribute_info_attributes[attributes_count];
3151 // }
3152 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3153 const ConstantPool* cp,
3154 const u1* const record_attribute_start,
3155 TRAPS) {
3156 const u1* const current_mark = cfs->current();
3157 int components_count = 0;
3158 unsigned int calculate_attr_size = 0;
3159 if (record_attribute_start != nullptr) {
3370 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3371 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3372 "Bad length on BootstrapMethods in class file %s",
3373 CHECK);
3374 }
3375
3376 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3377 ConstantPool* cp,
3378 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3379 TRAPS) {
3380 assert(cfs != nullptr, "invariant");
3381 assert(cp != nullptr, "invariant");
3382 assert(parsed_annotations != nullptr, "invariant");
3383
3384 // Set inner classes attribute to default sentinel
3385 _inner_classes = Universe::the_empty_short_array();
3386 // Set nest members attribute to default sentinel
3387 _nest_members = Universe::the_empty_short_array();
3388 // Set _permitted_subclasses attribute to default sentinel
3389 _permitted_subclasses = Universe::the_empty_short_array();
3390 cfs->guarantee_more(2, CHECK); // attributes_count
3391 u2 attributes_count = cfs->get_u2_fast();
3392 bool parsed_sourcefile_attribute = false;
3393 bool parsed_innerclasses_attribute = false;
3394 bool parsed_nest_members_attribute = false;
3395 bool parsed_permitted_subclasses_attribute = false;
3396 bool parsed_nest_host_attribute = false;
3397 bool parsed_record_attribute = false;
3398 bool parsed_enclosingmethod_attribute = false;
3399 bool parsed_bootstrap_methods_attribute = false;
3400 const u1* runtime_visible_annotations = nullptr;
3401 int runtime_visible_annotations_length = 0;
3402 const u1* runtime_visible_type_annotations = nullptr;
3403 int runtime_visible_type_annotations_length = 0;
3404 bool runtime_invisible_type_annotations_exists = false;
3405 bool runtime_invisible_annotations_exists = false;
3406 bool parsed_source_debug_ext_annotations_exist = false;
3407 const u1* inner_classes_attribute_start = nullptr;
3408 u4 inner_classes_attribute_length = 0;
3409 u2 enclosing_method_class_index = 0;
3410 u2 enclosing_method_method_index = 0;
3411 const u1* nest_members_attribute_start = nullptr;
3412 u4 nest_members_attribute_length = 0;
3413 const u1* record_attribute_start = nullptr;
3414 u4 record_attribute_length = 0;
3415 const u1* permitted_subclasses_attribute_start = nullptr;
3416 u4 permitted_subclasses_attribute_length = 0;
3417
3418 // Iterate over attributes
3419 while (attributes_count--) {
3420 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3421 const u2 attribute_name_index = cfs->get_u2_fast();
3422 const u4 attribute_length = cfs->get_u4_fast();
3423 guarantee_property(
3424 valid_symbol_at(attribute_name_index),
3425 "Attribute name has bad constant pool index %u in class file %s",
3426 attribute_name_index, CHECK);
3427 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3428 if (tag == vmSymbols::tag_source_file()) {
3429 // Check for SourceFile tag
3430 if (_need_verify) {
3431 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3432 }
3433 if (parsed_sourcefile_attribute) {
3434 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3435 return;
3436 } else {
3612 return;
3613 }
3614 parsed_record_attribute = true;
3615 record_attribute_start = cfs->current();
3616 record_attribute_length = attribute_length;
3617 } else if (_major_version >= JAVA_17_VERSION) {
3618 if (tag == vmSymbols::tag_permitted_subclasses()) {
3619 if (parsed_permitted_subclasses_attribute) {
3620 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3621 return;
3622 }
3623 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3624 if (_access_flags.is_final()) {
3625 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3626 return;
3627 }
3628 parsed_permitted_subclasses_attribute = true;
3629 permitted_subclasses_attribute_start = cfs->current();
3630 permitted_subclasses_attribute_length = attribute_length;
3631 }
3632 }
3633 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3634 cfs->skip_u1(attribute_length, CHECK);
3635 } else {
3636 // Unknown attribute
3637 cfs->skip_u1(attribute_length, CHECK);
3638 }
3639 } else {
3640 // Unknown attribute
3641 cfs->skip_u1(attribute_length, CHECK);
3642 }
3643 } else {
3644 // Unknown attribute
3645 cfs->skip_u1(attribute_length, CHECK);
3646 }
3647 }
3648 _class_annotations = allocate_annotations(runtime_visible_annotations,
3649 runtime_visible_annotations_length,
3650 CHECK);
3651 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3688 CHECK);
3689 if (_need_verify) {
3690 guarantee_property(record_attribute_length == calculated_attr_length,
3691 "Record attribute has wrong length in class file %s",
3692 CHECK);
3693 }
3694 }
3695
3696 if (parsed_permitted_subclasses_attribute) {
3697 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3698 cfs,
3699 permitted_subclasses_attribute_start,
3700 CHECK);
3701 if (_need_verify) {
3702 guarantee_property(
3703 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3704 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3705 }
3706 }
3707
3708 if (_max_bootstrap_specifier_index >= 0) {
3709 guarantee_property(parsed_bootstrap_methods_attribute,
3710 "Missing BootstrapMethods attribute in class file %s", CHECK);
3711 }
3712 }
3713
3714 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3715 assert(k != nullptr, "invariant");
3716
3717 if (_synthetic_flag)
3718 k->set_is_synthetic();
3719 if (_sourcefile_index != 0) {
3720 k->set_source_file_name_index(_sourcefile_index);
3721 }
3722 if (_generic_signature_index != 0) {
3723 k->set_generic_signature_index(_generic_signature_index);
3724 }
3725 if (_sde_buffer != nullptr) {
3726 k->set_source_debug_extension(_sde_buffer, _sde_length);
3727 }
3754 _class_type_annotations = nullptr;
3755 _fields_annotations = nullptr;
3756 _fields_type_annotations = nullptr;
3757 }
3758
3759 // Transfer ownership of metadata allocated to the InstanceKlass.
3760 void ClassFileParser::apply_parsed_class_metadata(
3761 InstanceKlass* this_klass,
3762 int java_fields_count) {
3763 assert(this_klass != nullptr, "invariant");
3764
3765 _cp->set_pool_holder(this_klass);
3766 this_klass->set_constants(_cp);
3767 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3768 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3769 this_klass->set_fields_status(_fields_status);
3770 this_klass->set_methods(_methods);
3771 this_klass->set_inner_classes(_inner_classes);
3772 this_klass->set_nest_members(_nest_members);
3773 this_klass->set_nest_host_index(_nest_host);
3774 this_klass->set_annotations(_combined_annotations);
3775 this_klass->set_permitted_subclasses(_permitted_subclasses);
3776 this_klass->set_record_components(_record_components);
3777
3778 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3779
3780 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3781 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3782 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3783 // its _super. If an OOM occurs while loading the current klass, its _super field
3784 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3785 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3786 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3787
3788 // Clear out these fields so they don't get deallocated by the destructor
3789 clear_class_metadata();
3790 }
3791
3792 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3793 int anno_length,
3794 TRAPS) {
3795 AnnotationArray* annotations = nullptr;
3796 if (anno != nullptr) {
3797 annotations = MetadataFactory::new_array<u1>(_loader_data,
3798 anno_length,
3799 CHECK_(annotations));
3800 for (int i = 0; i < anno_length; i++) {
3801 annotations->at_put(i, anno[i]);
3802 }
3803 }
3804 return annotations;
3805 }
3806
3807 void ClassFileParser::check_super_class(ConstantPool* const cp,
3808 const int super_class_index,
3809 const bool need_verify,
3810 TRAPS) {
3811 assert(cp != nullptr, "invariant");
3812
3813 if (super_class_index == 0) {
3814 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3815 "Invalid superclass index %u in class file %s",
3816 super_class_index,
3817 CHECK);
3818 } else {
3819 guarantee_property(valid_klass_reference_at(super_class_index),
3820 "Invalid superclass index %u in class file %s",
3821 super_class_index,
3822 CHECK);
3823
3824 // The class name should be legal because it is checked when parsing constant pool.
3825 // However, make sure it is not an array type.
3826 if (need_verify) {
3827 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3828 "Bad superclass name in class file %s", CHECK);
3829 }
3830 }
3831 }
3832
3833 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3834 _max_nonstatic_oop_maps = max_blocks;
3835 _nonstatic_oop_map_count = 0;
3836 if (max_blocks == 0) {
3988 // See documentation of InstanceKlass::can_be_fastpath_allocated().
3989 assert(ik->size_helper() > 0, "layout_helper is initialized");
3990 if (ik->is_abstract() || ik->is_interface()
3991 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
3992 || ik->size_helper() >= FastAllocateSizeLimit) {
3993 // Forbid fast-path allocation.
3994 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
3995 ik->set_layout_helper(lh);
3996 }
3997
3998 // Propagate the AOT runtimeSetup method discovery
3999 if (_has_aot_runtime_setup_method) {
4000 ik->set_is_runtime_setup_required();
4001 if (log_is_enabled(Info, aot, init)) {
4002 ResourceMark rm;
4003 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4004 }
4005 }
4006 }
4007
4008 // utility methods for appending an array with check for duplicates
4009
4010 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4011 const Array<InstanceKlass*>* const ifs) {
4012 // iterate over new interfaces
4013 for (int i = 0; i < ifs->length(); i++) {
4014 InstanceKlass* const e = ifs->at(i);
4015 assert(e->is_klass() && e->is_interface(), "just checking");
4016 // add new interface
4017 result->append_if_missing(e);
4018 }
4019 }
4020
4021 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4022 Array<InstanceKlass*>* local_ifs,
4023 ClassLoaderData* loader_data,
4024 TRAPS) {
4025 assert(local_ifs != nullptr, "invariant");
4026 assert(loader_data != nullptr, "invariant");
4027
4054 } else {
4055 ResourceMark rm;
4056 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4057
4058 // Copy down from superclass
4059 if (super != nullptr) {
4060 append_interfaces(result, super->transitive_interfaces());
4061 }
4062
4063 // Copy down from local interfaces' superinterfaces
4064 for (int i = 0; i < local_size; i++) {
4065 InstanceKlass* const l = local_ifs->at(i);
4066 append_interfaces(result, l->transitive_interfaces());
4067 }
4068 // Finally add local interfaces
4069 append_interfaces(result, local_ifs);
4070
4071 // length will be less than the max_transitive_size if duplicates were removed
4072 const int length = result->length();
4073 assert(length <= max_transitive_size, "just checking");
4074 Array<InstanceKlass*>* const new_result =
4075 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4076 for (int i = 0; i < length; i++) {
4077 InstanceKlass* const e = result->at(i);
4078 assert(e != nullptr, "just checking");
4079 new_result->at_put(i, e);
4080 }
4081 return new_result;
4082 }
4083 }
4084
4085 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4086 assert(this_klass != nullptr, "invariant");
4087 const InstanceKlass* const super = this_klass->super();
4088
4089 if (super != nullptr) {
4090 if (super->is_final()) {
4091 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4092 return;
4093 }
4094
4095 if (super->is_sealed()) {
4096 stringStream ss;
4097 ResourceMark rm(THREAD);
4098 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4099 classfile_icce_error(ss.as_string(), THREAD);
4100 return;
4101 }
4102 }
4103
4104 Reflection::VerifyClassAccessResults vca_result =
4105 Reflection::verify_class_access(this_klass, super, false);
4106 if (vca_result != Reflection::ACCESS_OK) {
4107 ResourceMark rm(THREAD);
4108 char* msg = Reflection::verify_class_access_msg(this_klass,
4109 super,
4110 vca_result);
4111
4112 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4113 if (msg == nullptr) {
4114 bool same_module = (this_klass->module() == super->module());
4115 Exceptions::fthrow(
4116 THREAD_AND_LOCATION,
4117 vmSymbols::java_lang_IllegalAccessError(),
4118 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4119 this_klass->external_name(),
4120 super->is_abstract() ? "abstract " : "",
4121 super->external_name(),
4122 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4123 (same_module) ? "" : "; ",
4276 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4277 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4278 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4279 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4280 if (is_module) {
4281 ResourceMark rm(THREAD);
4282 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4283 Exceptions::fthrow(
4284 THREAD_AND_LOCATION,
4285 vmSymbols::java_lang_NoClassDefFoundError(),
4286 "%s is not a class because access_flag ACC_MODULE is set",
4287 _class_name->as_C_string());
4288 return;
4289 }
4290
4291 if (!_need_verify) { return; }
4292
4293 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4294 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4295 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4296 const bool is_super = (flags & JVM_ACC_SUPER) != 0;
4297 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4298 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4299 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4300
4301 if ((is_abstract && is_final) ||
4302 (is_interface && !is_abstract) ||
4303 (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4304 (!is_interface && major_gte_1_5 && is_annotation)) {
4305 ResourceMark rm(THREAD);
4306 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4307 if (inner_name == nullptr && !is_anonymous_inner_class) {
4308 Exceptions::fthrow(
4309 THREAD_AND_LOCATION,
4310 vmSymbols::java_lang_ClassFormatError(),
4311 "Illegal class modifiers in class %s: 0x%X",
4312 _class_name->as_C_string(), flags
4313 );
4314 } else {
4315 if (is_anonymous_inner_class) {
4316 Exceptions::fthrow(
4317 THREAD_AND_LOCATION,
4318 vmSymbols::java_lang_ClassFormatError(),
4319 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4320 _class_name->as_C_string(), flags
4321 );
4322 } else {
4323 Exceptions::fthrow(
4324 THREAD_AND_LOCATION,
4379 THREAD_AND_LOCATION,
4380 vmSymbols::java_lang_UnsupportedClassVersionError(),
4381 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4382 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4383 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4384 return;
4385 }
4386
4387 if (!Arguments::enable_preview()) {
4388 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4389 class_name, major, minor, THREAD);
4390 return;
4391 }
4392
4393 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4394 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4395 class_name, major, minor, THREAD);
4396 }
4397 }
4398
4399 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4400 bool is_interface,
4401 TRAPS) const {
4402 if (!_need_verify) { return; }
4403
4404 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4405 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4406 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4407 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4408 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4409 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4410 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4411 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4412 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4413
4414 bool is_illegal = false;
4415
4416 if (is_interface) {
4417 if (!is_public || !is_static || !is_final || is_private ||
4418 is_protected || is_volatile || is_transient ||
4419 (major_gte_1_5 && is_enum)) {
4420 is_illegal = true;
4421 }
4422 } else { // not interface
4423 if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4424 is_illegal = true;
4425 }
4426 }
4427
4428 if (is_illegal) {
4429 ResourceMark rm(THREAD);
4430 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4431 Exceptions::fthrow(
4432 THREAD_AND_LOCATION,
4433 vmSymbols::java_lang_ClassFormatError(),
4434 "Illegal field modifiers in class %s: 0x%X",
4435 _class_name->as_C_string(), flags);
4436 return;
4437 }
4438 }
4439
4440 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4441 bool is_interface,
4442 const Symbol* name,
4443 TRAPS) const {
4444 if (!_need_verify) { return; }
4445
4446 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4447 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4448 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4449 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4450 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4451 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4452 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4453 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4454 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4455 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4456 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4457 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4458 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4459 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4460
4461 bool is_illegal = false;
4462
4463 if (is_interface) {
4464 if (major_gte_8) {
4465 // Class file version is JAVA_8_VERSION or later Methods of
4466 // interfaces may set any of the flags except ACC_PROTECTED,
4467 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4468 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4469 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4470 (is_native || is_protected || is_final || is_synchronized) ||
4471 // If a specific method of a class or interface has its
4472 // ACC_ABSTRACT flag set, it must not have any of its
4473 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4474 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4475 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4476 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4477 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4478 is_illegal = true;
4479 }
4480 } else if (major_gte_1_5) {
4481 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4482 if (!is_public || is_private || is_protected || is_static || is_final ||
4483 is_synchronized || is_native || !is_abstract || is_strict) {
4484 is_illegal = true;
4485 }
4486 } else {
4487 // Class file version is pre-JAVA_1_5_VERSION
4488 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4489 is_illegal = true;
4490 }
4491 }
4492 } else { // not interface
4493 if (has_illegal_visibility(flags)) {
4494 is_illegal = true;
4495 } else {
4496 if (is_initializer) {
4497 if (is_static || is_final || is_synchronized || is_native ||
4498 is_abstract || (major_gte_1_5 && is_bridge)) {
4499 is_illegal = true;
4500 }
4501 } else { // not initializer
4502 if (is_abstract) {
4503 if ((is_final || is_native || is_private || is_static ||
4504 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4505 is_illegal = true;
4506 }
4507 }
4508 }
4509 }
4510 }
4511
4512 if (is_illegal) {
4513 ResourceMark rm(THREAD);
4514 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4515 Exceptions::fthrow(
4516 THREAD_AND_LOCATION,
4517 vmSymbols::java_lang_ClassFormatError(),
4518 "Method %s in class %s has illegal modifiers: 0x%X",
4519 name->as_C_string(), _class_name->as_C_string(), flags);
4520 return;
4521 }
4522 }
4523
4524 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4525 int length,
4526 TRAPS) const {
4527 assert(_need_verify, "only called when _need_verify is true");
4528 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4529 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4530 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4531 }
4532 }
4533
4534 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4535 // In class names, '/' separates unqualified names. This is verified in this function also.
4536 // Method names also may not contain the characters '<' or '>', unless <init>
4537 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4538 // method. Because these names have been checked as special cases before
4539 // calling this method in verify_legal_method_name.
4557 if (type == ClassFileParser::LegalClass) {
4558 if (p == name || p+1 >= name+length ||
4559 *(p+1) == JVM_SIGNATURE_SLASH) {
4560 return false;
4561 }
4562 } else {
4563 return false; // do not permit '/' unless it's class name
4564 }
4565 break;
4566 case JVM_SIGNATURE_SPECIAL:
4567 case JVM_SIGNATURE_ENDSPECIAL:
4568 // do not permit '<' or '>' in method names
4569 if (type == ClassFileParser::LegalMethod) {
4570 return false;
4571 }
4572 }
4573 }
4574 return true;
4575 }
4576
4577 // Take pointer to a UTF8 byte string (not NUL-terminated).
4578 // Skip over the longest part of the string that could
4579 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4580 // Return a pointer to just past the fieldname.
4581 // Return null if no fieldname at all was found, or in the case of slash_ok
4582 // being true, we saw consecutive slashes (meaning we were looking for a
4583 // qualified path but found something that was badly-formed).
4584 static const char* skip_over_field_name(const char* const name,
4585 bool slash_ok,
4586 unsigned int length) {
4587 const char* p;
4588 jboolean last_is_slash = false;
4589 jboolean not_first_ch = false;
4590
4591 for (p = name; p != name + length; not_first_ch = true) {
4592 const char* old_p = p;
4593 jchar ch = *p;
4594 if (ch < 128) {
4595 p++;
4596 // quick check for ascii
4823 } else {
4824 // 4881221: relax the constraints based on JSR202 spec
4825 legal = verify_unqualified_name(bytes, length, LegalMethod);
4826 }
4827 }
4828
4829 if (!legal) {
4830 ResourceMark rm(THREAD);
4831 assert(_class_name != nullptr, "invariant");
4832 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4833 Exceptions::fthrow(
4834 THREAD_AND_LOCATION,
4835 vmSymbols::java_lang_ClassFormatError(),
4836 "Illegal method name \"%.*s\" in class %s", length, bytes,
4837 _class_name->as_C_string()
4838 );
4839 return;
4840 }
4841 }
4842
4843
4844 // Checks if signature is a legal field signature.
4845 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4846 const Symbol* signature,
4847 TRAPS) const {
4848 if (!_need_verify) { return; }
4849
4850 const char* const bytes = (const char*)signature->bytes();
4851 const unsigned int length = signature->utf8_length();
4852 const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4853
4854 if (p == nullptr || (p - bytes) != (int)length) {
4855 throwIllegalSignature("Field", name, signature, CHECK);
4856 }
4857 }
4858
4859 // Check that the signature is compatible with the method name. For example,
4860 // check that <init> has a void signature.
4861 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4862 const Symbol* signature,
4863 TRAPS) const {
4864 if (!_need_verify) {
4865 return;
4866 }
4867
4868 // Class initializers cannot have args for class format version >= 51.
4869 if (name == vmSymbols::class_initializer_name() &&
4870 signature != vmSymbols::void_method_signature() &&
4871 _major_version >= JAVA_7_VERSION) {
4872 throwIllegalSignature("Method", name, signature, THREAD);
4873 return;
4874 }
4911 length -= pointer_delta_as_int(nextp, p);
4912 p = nextp;
4913 nextp = skip_over_field_signature(p, false, length, CHECK_0);
4914 }
4915 // The first non-signature thing better be a ')'
4916 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
4917 length--;
4918 // Now we better just have a return value
4919 nextp = skip_over_field_signature(p, true, length, CHECK_0);
4920 if (nextp && ((int)length == (nextp - p))) {
4921 return args_size;
4922 }
4923 }
4924 }
4925 // Report error
4926 throwIllegalSignature("Method", name, signature, THREAD);
4927 return 0;
4928 }
4929
4930 int ClassFileParser::static_field_size() const {
4931 assert(_field_info != nullptr, "invariant");
4932 return _field_info->_static_field_size;
4933 }
4934
4935 int ClassFileParser::total_oop_map_count() const {
4936 assert(_field_info != nullptr, "invariant");
4937 return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
4938 }
4939
4940 jint ClassFileParser::layout_size() const {
4941 assert(_field_info != nullptr, "invariant");
4942 return _field_info->_instance_size;
4943 }
4944
4945 static void check_methods_for_intrinsics(const InstanceKlass* ik,
4946 const Array<Method*>* methods) {
4947 assert(ik != nullptr, "invariant");
4948 assert(methods != nullptr, "invariant");
4949
4950 // Set up Method*::intrinsic_id as soon as we know the names of methods.
4951 // (We used to do this lazily, but now we query it in Rewriter,
4952 // which is eagerly done for every method, so we might as well do it now,
4953 // when everything is fresh in memory.)
4954 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
4955
4956 if (klass_id != vmSymbolID::NO_SID) {
4957 for (int j = 0; j < methods->length(); ++j) {
4958 Method* method = methods->at(j);
4959 method->init_intrinsic_id(klass_id);
4960
4961 if (CheckIntrinsics) {
4962 // Check if an intrinsic is defined for method 'method',
5037 }
5038 }
5039
5040 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5041 const ClassInstanceInfo& cl_inst_info,
5042 TRAPS) {
5043 if (_klass != nullptr) {
5044 return _klass;
5045 }
5046
5047 InstanceKlass* const ik =
5048 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5049
5050 if (is_hidden()) {
5051 mangle_hidden_class_name(ik);
5052 }
5053
5054 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5055
5056 assert(_klass == ik, "invariant");
5057
5058 return ik;
5059 }
5060
5061 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5062 bool changed_by_loadhook,
5063 const ClassInstanceInfo& cl_inst_info,
5064 TRAPS) {
5065 assert(ik != nullptr, "invariant");
5066
5067 // Set name and CLD before adding to CLD
5068 ik->set_class_loader_data(_loader_data);
5069 ik->set_class_loader_type();
5070 ik->set_name(_class_name);
5071
5072 // Add all classes to our internal class loader list here,
5073 // including classes in the bootstrap (null) class loader.
5074 const bool publicize = !is_internal();
5075
5076 _loader_data->add_class(ik, publicize);
5077
5078 set_klass_to_deallocate(ik);
5079
5080 assert(_field_info != nullptr, "invariant");
5081 assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5082 assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5083 "sanity");
5084
5085 assert(ik->is_instance_klass(), "sanity");
5086 assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5087
5088 // Fill in information already parsed
5089 ik->set_should_verify_class(_need_verify);
5090
5091 // Not yet: supers are done below to support the new subtype-checking fields
5092 ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5093 ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5094 ik->set_static_oop_field_count(_static_oop_count);
5095
5096 // this transfers ownership of a lot of arrays from
5097 // the parser onto the InstanceKlass*
5098 apply_parsed_class_metadata(ik, _java_fields_count);
5099
5100 // can only set dynamic nest-host after static nest information is set
5101 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5102 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5103 }
5104
5105 // note that is not safe to use the fields in the parser from this point on
5106 assert(nullptr == _cp, "invariant");
5107 assert(nullptr == _fieldinfo_stream, "invariant");
5108 assert(nullptr == _fieldinfo_search_table, "invariant");
5109 assert(nullptr == _fields_status, "invariant");
5110 assert(nullptr == _methods, "invariant");
5111 assert(nullptr == _inner_classes, "invariant");
5112 assert(nullptr == _nest_members, "invariant");
5113 assert(nullptr == _combined_annotations, "invariant");
5114 assert(nullptr == _record_components, "invariant");
5115 assert(nullptr == _permitted_subclasses, "invariant");
5116
5117 if (_has_localvariable_table) {
5118 ik->set_has_localvariable_table(true);
5119 }
5120
5121 if (_has_final_method) {
5122 ik->set_has_final_method();
5123 }
5124
5125 ik->copy_method_ordering(_method_ordering, CHECK);
5126 // The InstanceKlass::_methods_jmethod_ids cache
5127 // is managed on the assumption that the initial cache
5128 // size is equal to the number of methods in the class. If
5129 // that changes, then InstanceKlass::idnum_can_increment()
5130 // has to be changed accordingly.
5131 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5132
5133 ik->set_this_class_index(_this_class_index);
5134
5135 if (_is_hidden) {
5172 if ((_num_miranda_methods > 0) ||
5173 // if this class introduced new miranda methods or
5174 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5175 // super class exists and this class inherited miranda methods
5176 ) {
5177 ik->set_has_miranda_methods(); // then set a flag
5178 }
5179
5180 // Fill in information needed to compute superclasses.
5181 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5182 ik->set_transitive_interfaces(_transitive_interfaces);
5183 ik->set_local_interfaces(_local_interfaces);
5184 _transitive_interfaces = nullptr;
5185 _local_interfaces = nullptr;
5186
5187 // Initialize itable offset tables
5188 klassItable::setup_itable_offset_table(ik);
5189
5190 // Compute transitive closure of interfaces this class implements
5191 // Do final class setup
5192 OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5193 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5194 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5195 }
5196
5197 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5198 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5199 ik->set_has_contended_annotations(true);
5200 }
5201
5202 // Fill in has_finalizer and layout_helper
5203 set_precomputed_flags(ik);
5204
5205 // check if this class can access its super class
5206 check_super_class_access(ik, CHECK);
5207
5208 // check if this class can access its superinterfaces
5209 check_super_interface_access(ik, CHECK);
5210
5211 // check if this class overrides any final method
5212 check_final_method_override(ik, CHECK);
5233
5234 assert(_all_mirandas != nullptr, "invariant");
5235
5236 // Generate any default methods - default methods are public interface methods
5237 // that have a default implementation. This is new with Java 8.
5238 if (_has_nonstatic_concrete_methods) {
5239 DefaultMethods::generate_default_methods(ik,
5240 _all_mirandas,
5241 CHECK);
5242 }
5243
5244 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5245 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5246 !module_entry->has_default_read_edges()) {
5247 if (!module_entry->set_has_default_read_edges()) {
5248 // We won a potential race
5249 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5250 }
5251 }
5252
5253 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5254
5255 if (!is_internal()) {
5256 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5257 if (CDSConfig::is_dumping_archive()) {
5258 SystemDictionaryShared::check_code_source(ik, _stream);
5259 }
5260
5261 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5262 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5263 log_is_enabled(Info, class, preview)) {
5264 ResourceMark rm;
5265 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5266 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5267 }
5268
5269 if (log_is_enabled(Debug, class, resolve)) {
5270 ResourceMark rm;
5271 // print out the superclass.
5272 const char * from = ik->external_name();
5316 const ClassLoadInfo* cl_info,
5317 Publicity pub_level,
5318 TRAPS) :
5319 _stream(stream),
5320 _class_name(nullptr),
5321 _loader_data(loader_data),
5322 _is_hidden(cl_info->is_hidden()),
5323 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5324 _orig_cp_size(0),
5325 _static_oop_count(0),
5326 _super_klass(),
5327 _cp(nullptr),
5328 _fieldinfo_stream(nullptr),
5329 _fieldinfo_search_table(nullptr),
5330 _fields_status(nullptr),
5331 _methods(nullptr),
5332 _inner_classes(nullptr),
5333 _nest_members(nullptr),
5334 _nest_host(0),
5335 _permitted_subclasses(nullptr),
5336 _record_components(nullptr),
5337 _local_interfaces(nullptr),
5338 _transitive_interfaces(nullptr),
5339 _combined_annotations(nullptr),
5340 _class_annotations(nullptr),
5341 _class_type_annotations(nullptr),
5342 _fields_annotations(nullptr),
5343 _fields_type_annotations(nullptr),
5344 _klass(nullptr),
5345 _klass_to_deallocate(nullptr),
5346 _parsed_annotations(nullptr),
5347 _field_info(nullptr),
5348 _temp_field_info(nullptr),
5349 _method_ordering(nullptr),
5350 _all_mirandas(nullptr),
5351 _vtable_size(0),
5352 _itable_size(0),
5353 _num_miranda_methods(0),
5354 _protection_domain(cl_info->protection_domain()),
5355 _access_flags(),
5356 _pub_level(pub_level),
5357 _bad_constant_seen(0),
5358 _synthetic_flag(false),
5359 _sde_length(false),
5360 _sde_buffer(nullptr),
5361 _sourcefile_index(0),
5362 _generic_signature_index(0),
5363 _major_version(0),
5364 _minor_version(0),
5365 _this_class_index(0),
5366 _super_class_index(0),
5367 _itfs_len(0),
5368 _java_fields_count(0),
5369 _need_verify(false),
5370 _has_nonstatic_concrete_methods(false),
5371 _declares_nonstatic_concrete_methods(false),
5372 _has_localvariable_table(false),
5373 _has_final_method(false),
5374 _has_contended_fields(false),
5375 _has_aot_runtime_setup_method(false),
5376 _has_finalizer(false),
5377 _has_empty_finalizer(false),
5378 _max_bootstrap_specifier_index(-1) {
5379
5380 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5381 _class_name->increment_refcount();
5382
5383 assert(_loader_data != nullptr, "invariant");
5384 assert(stream != nullptr, "invariant");
5385 assert(_stream != nullptr, "invariant");
5386 assert(_stream->buffer() == _stream->current(), "invariant");
5387 assert(_class_name != nullptr, "invariant");
5388 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5389
5390 // Figure out whether we can skip format checking (matching classic VM behavior)
5391 // Always verify CFLH bytes from the user agents.
5392 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5393
5394 // synch back verification state to stream to check for truncation.
5395 stream->set_need_verify(_need_verify);
5396
5397 parse_stream(stream, CHECK);
5398
5399 post_process_parsed_stream(stream, _cp, CHECK);
5400 }
5401
5402 void ClassFileParser::clear_class_metadata() {
5403 // metadata created before the instance klass is created. Must be
5404 // deallocated if classfile parsing returns an error.
5405 _cp = nullptr;
5406 _fieldinfo_stream = nullptr;
5407 _fieldinfo_search_table = nullptr;
5408 _fields_status = nullptr;
5409 _methods = nullptr;
5410 _inner_classes = nullptr;
5411 _nest_members = nullptr;
5412 _permitted_subclasses = nullptr;
5413 _combined_annotations = nullptr;
5414 _class_annotations = _class_type_annotations = nullptr;
5415 _fields_annotations = _fields_type_annotations = nullptr;
5416 _record_components = nullptr;
5417 }
5418
5419 // Destructor to clean up
5420 ClassFileParser::~ClassFileParser() {
5421 _class_name->decrement_refcount();
5422
5423 if (_cp != nullptr) {
5424 MetadataFactory::free_metadata(_loader_data, _cp);
5425 }
5426
5427 if (_fieldinfo_stream != nullptr) {
5428 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5429 }
5430 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5431
5432 if (_fields_status != nullptr) {
5433 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5434 }
5435
5436 if (_methods != nullptr) {
5437 // Free methods
5438 InstanceKlass::deallocate_methods(_loader_data, _methods);
5439 }
5440
5441 // beware of the Universe::empty_blah_array!!
5442 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5443 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5444 }
5445
5446 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5447 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5448 }
5449
5450 if (_record_components != nullptr) {
5451 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5452 }
5453
5454 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5455 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5456 }
5457
5458 // Free interfaces
5459 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5460 _local_interfaces, _transitive_interfaces);
5461
5462 if (_combined_annotations != nullptr) {
5463 // After all annotations arrays have been created, they are installed into the
5464 // Annotations object that will be assigned to the InstanceKlass being created.
5465
5466 // Deallocate the Annotations object and the installed annotations arrays.
5467 _combined_annotations->deallocate_contents(_loader_data);
5468
5469 // If the _combined_annotations pointer is non-null,
5470 // then the other annotations fields should have been cleared.
5471 assert(_class_annotations == nullptr, "Should have been cleared");
5472 assert(_class_type_annotations == nullptr, "Should have been cleared");
5473 assert(_fields_annotations == nullptr, "Should have been cleared");
5474 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5475 } else {
5476 // If the annotations arrays were not installed into the Annotations object,
5477 // then they have to be deallocated explicitly.
5537
5538 assert(cp_size == (u2)cp->length(), "invariant");
5539
5540 // ACCESS FLAGS
5541 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5542
5543 // Access flags
5544 u2 flags;
5545 // JVM_ACC_MODULE is defined in JDK-9 and later.
5546 if (_major_version >= JAVA_9_VERSION) {
5547 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5548 } else {
5549 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5550 }
5551
5552 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5553 // Set abstract bit for old class files for backward compatibility
5554 flags |= JVM_ACC_ABSTRACT;
5555 }
5556
5557 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5558
5559 short bad_constant = class_bad_constant_seen();
5560 if (bad_constant != 0) {
5561 // Do not throw CFE until after the access_flags are checked because if
5562 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5563 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5564 return;
5565 }
5566
5567 _access_flags.set_flags(flags);
5568
5569 // This class and superclass
5570 _this_class_index = stream->get_u2_fast();
5571 guarantee_property(
5572 valid_cp_range(_this_class_index, cp_size) &&
5573 cp->tag_at(_this_class_index).is_unresolved_klass(),
5574 "Invalid this class index %u in constant pool in class file %s",
5575 _this_class_index, CHECK);
5576
5644
5645 // SUPERKLASS
5646 _super_class_index = stream->get_u2_fast();
5647 check_super_class(cp,
5648 _super_class_index,
5649 _need_verify,
5650 CHECK);
5651
5652 // Interfaces
5653 _itfs_len = stream->get_u2_fast();
5654 parse_interfaces(stream,
5655 _itfs_len,
5656 cp,
5657 &_has_nonstatic_concrete_methods,
5658 CHECK);
5659
5660 assert(_local_interfaces != nullptr, "invariant");
5661
5662 // Fields (offsets are filled in later)
5663 parse_fields(stream,
5664 _access_flags.is_interface(),
5665 cp,
5666 cp_size,
5667 &_java_fields_count,
5668 CHECK);
5669
5670 assert(_temp_field_info != nullptr, "invariant");
5671
5672 // Methods
5673 parse_methods(stream,
5674 _access_flags.is_interface(),
5675 &_has_localvariable_table,
5676 &_has_final_method,
5677 &_declares_nonstatic_concrete_methods,
5678 CHECK);
5679
5680 assert(_methods != nullptr, "invariant");
5681
5682 if (_declares_nonstatic_concrete_methods) {
5683 _has_nonstatic_concrete_methods = true;
5684 }
5764 // errors not checked yet.
5765 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5766 "Interfaces must have java.lang.Object as superclass in class file %s",
5767 CHECK);
5768 }
5769 Handle loader(THREAD, _loader_data->class_loader());
5770 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5771 // fast path to avoid lookup
5772 _super_klass = vmClasses::Object_klass();
5773 } else {
5774 _super_klass = (const InstanceKlass*)
5775 SystemDictionary::resolve_super_or_fail(_class_name,
5776 super_class_name,
5777 loader,
5778 true,
5779 CHECK);
5780 }
5781 }
5782
5783 if (_super_klass != nullptr) {
5784 if (_super_klass->has_nonstatic_concrete_methods()) {
5785 _has_nonstatic_concrete_methods = true;
5786 }
5787
5788 if (_super_klass->is_interface()) {
5789 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5790 return;
5791 }
5792 }
5793
5794 // Compute the transitive list of all unique interfaces implemented by this class
5795 _transitive_interfaces =
5796 compute_transitive_interfaces(_super_klass,
5797 _local_interfaces,
5798 _loader_data,
5799 CHECK);
5800
5801 assert(_transitive_interfaces != nullptr, "invariant");
5802
5803 // sort methods
5804 _method_ordering = sort_methods(_methods);
5805
5806 _all_mirandas = new GrowableArray<Method*>(20);
5807
5808 Handle loader(THREAD, _loader_data->class_loader());
5809 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5810 &_num_miranda_methods,
5811 _all_mirandas,
5812 _super_klass,
5813 _methods,
5814 _access_flags,
5815 _major_version,
5816 loader,
5817 _class_name,
5818 _local_interfaces);
5819
5820 // Size of Java itable (in words)
5821 _itable_size = _access_flags.is_interface() ? 0 :
5822 klassItable::compute_itable_size(_transitive_interfaces);
5823
5824 assert(_parsed_annotations != nullptr, "invariant");
5825
5826 _field_info = new FieldLayoutInfo();
5827 FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5828 _parsed_annotations->is_contended(), _field_info);
5829 lb.build_layout();
5830
5831 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5832 _fieldinfo_stream =
5833 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5834 injected_fields_count, loader_data(), CHECK);
5835 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
5836 _fields_status =
5837 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5838 FieldStatus(0), CHECK);
5839 }
5840
5841 void ClassFileParser::set_klass(InstanceKlass* klass) {
5842
5843 #ifdef ASSERT
5844 if (klass != nullptr) {
5845 assert(nullptr == _klass, "leaking?");
5846 }
5847 #endif
5848
5849 _klass = klass;
5850 }
5851
5852 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5853
5854 #ifdef ASSERT
5855 if (klass != nullptr) {
5856 assert(nullptr == _klass_to_deallocate, "leaking?");
5857 }
5858 #endif
5859
5860 _klass_to_deallocate = klass;
5861 }
5862
5863 // Caller responsible for ResourceMark
5864 // clone stream with rewound position
5865 const ClassFileStream* ClassFileParser::clone_stream() const {
5866 assert(_stream != nullptr, "invariant");
5867
5868 return _stream->clone();
5869 }
5870
5871 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/systemDictionaryShared.hpp"
39 #include "classfile/verificationType.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.hpp"
47 #include "memory/metadataFactory.hpp"
48 #include "memory/oopFactory.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/annotations.hpp"
52 #include "oops/bsmAttribute.inline.hpp"
53 #include "oops/constantPool.inline.hpp"
54 #include "oops/fieldInfo.hpp"
55 #include "oops/fieldStreams.inline.hpp"
56 #include "oops/inlineKlass.inline.hpp"
57 #include "oops/instanceKlass.inline.hpp"
58 #include "oops/instanceMirrorKlass.hpp"
59 #include "oops/klass.inline.hpp"
60 #include "oops/klassVtable.hpp"
61 #include "oops/metadata.hpp"
62 #include "oops/method.inline.hpp"
63 #include "oops/oop.inline.hpp"
64 #include "oops/recordComponent.hpp"
65 #include "oops/symbol.hpp"
66 #include "prims/jvmtiExport.hpp"
67 #include "prims/jvmtiThreadState.hpp"
68 #include "runtime/arguments.hpp"
69 #include "runtime/fieldDescriptor.inline.hpp"
70 #include "runtime/handles.inline.hpp"
71 #include "runtime/javaCalls.hpp"
72 #include "runtime/os.hpp"
73 #include "runtime/perfData.hpp"
74 #include "runtime/reflection.hpp"
75 #include "runtime/safepointVerifiers.hpp"
76 #include "runtime/signature.hpp"
77 #include "runtime/timer.hpp"
78 #include "services/classLoadingService.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/align.hpp"
81 #include "utilities/bitMap.inline.hpp"
82 #include "utilities/checkedCast.hpp"
83 #include "utilities/copy.hpp"
84 #include "utilities/exceptions.hpp"
85 #include "utilities/formatBuffer.hpp"
86 #include "utilities/globalDefinitions.hpp"
87 #include "utilities/growableArray.hpp"
88 #include "utilities/hashTable.hpp"
89 #include "utilities/macros.hpp"
90 #include "utilities/ostream.hpp"
91 #include "utilities/stringUtils.hpp"
92 #include "utilities/utf8.hpp"
93
94 // We generally try to create the oops directly when parsing, rather than
95 // allocating temporary data structures and copying the bytes twice. A
96 // temporary area is only needed when parsing utf8 entries in the constant
97 // pool and when parsing line number tables.
98
99 // We add assert in debug mode when class format is not checked.
100
101 #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE
102 #define JAVA_MIN_SUPPORTED_VERSION 45
103 #define JAVA_PREVIEW_MINOR_VERSION 65535
104
105 // Used for two backward compatibility reasons:
106 // - to check for new additions to the class file format in JDK1.5
107 // - to check for bug fixes in the format checker in JDK1.5
108 #define JAVA_1_5_VERSION 49
109
110 // Used for backward compatibility reasons:
111 // - to check for javac bug fixes that happened after 1.5
482 guarantee_property(valid_symbol_at(name_ref_index),
483 "Invalid constant pool index %u in class file %s",
484 name_ref_index, CHECK);
485 guarantee_property(valid_symbol_at(signature_ref_index),
486 "Invalid constant pool index %u in class file %s",
487 signature_ref_index, CHECK);
488 break;
489 }
490 case JVM_CONSTANT_Utf8:
491 break;
492 case JVM_CONSTANT_UnresolvedClass: // fall-through
493 case JVM_CONSTANT_UnresolvedClassInError: {
494 ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present
495 break;
496 }
497 case JVM_CONSTANT_ClassIndex: {
498 const int class_index = cp->klass_index_at(index);
499 guarantee_property(valid_symbol_at(class_index),
500 "Invalid constant pool index %u in class file %s",
501 class_index, CHECK);
502
503 cp->unresolved_klass_at_put(index, class_index, num_klasses++);
504 break;
505 }
506 case JVM_CONSTANT_StringIndex: {
507 const int string_index = cp->string_index_at(index);
508 guarantee_property(valid_symbol_at(string_index),
509 "Invalid constant pool index %u in class file %s",
510 string_index, CHECK);
511 Symbol* const sym = cp->symbol_at(string_index);
512 cp->unresolved_string_at_put(index, sym);
513 break;
514 }
515 case JVM_CONSTANT_MethodHandle: {
516 const int ref_index = cp->method_handle_index_at(index);
517 guarantee_property(valid_cp_range(ref_index, length),
518 "Invalid constant pool index %u in class file %s",
519 ref_index, CHECK);
520 const constantTag tag = cp->tag_at(ref_index);
521 const int ref_kind = cp->method_handle_ref_kind_at(index);
522
924 class AnnotationCollector : public ResourceObj{
925 public:
926 enum Location { _in_field, _in_method, _in_class };
927 enum ID {
928 _unknown = 0,
929 _method_CallerSensitive,
930 _method_ForceInline,
931 _method_DontInline,
932 _method_ChangesCurrentThread,
933 _method_JvmtiHideEvents,
934 _method_JvmtiMountTransition,
935 _method_InjectedProfile,
936 _method_LambdaForm_Compiled,
937 _method_Hidden,
938 _method_Scoped,
939 _method_IntrinsicCandidate,
940 _jdk_internal_vm_annotation_Contended,
941 _field_Stable,
942 _jdk_internal_vm_annotation_ReservedStackAccess,
943 _jdk_internal_ValueBased,
944 _jdk_internal_LooselyConsistentValue,
945 _jdk_internal_NullRestricted,
946 _java_lang_Deprecated,
947 _java_lang_Deprecated_for_removal,
948 _jdk_internal_vm_annotation_AOTSafeClassInitializer,
949 _method_AOTRuntimeSetup,
950 _jdk_internal_vm_annotation_TrustFinalFields,
951 _annotation_LIMIT
952 };
953 const Location _location;
954 int _annotations_present;
955 u2 _contended_group;
956
957 AnnotationCollector(Location location)
958 : _location(location), _annotations_present(0), _contended_group(0)
959 {
960 assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
961 }
962 // If this annotation name has an ID, report it (or _none).
963 ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
964 // Set the annotation name:
965 void set_annotation(ID id) {
1360 }
1361
1362 *constantvalue_index_addr = constantvalue_index;
1363 *is_synthetic_addr = is_synthetic;
1364 *generic_signature_index_addr = generic_signature_index;
1365 AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1366 runtime_visible_annotations_length,
1367 CHECK);
1368 parsed_annotations->set_field_annotations(a);
1369 a = allocate_annotations(runtime_visible_type_annotations,
1370 runtime_visible_type_annotations_length,
1371 CHECK);
1372 parsed_annotations->set_field_type_annotations(a);
1373 return;
1374 }
1375
1376
1377 // Side-effects: populates the _fields, _fields_annotations,
1378 // _fields_type_annotations fields
1379 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1380 AccessFlags class_access_flags,
1381 ConstantPool* cp,
1382 const int cp_size,
1383 u2* const java_fields_count_ptr,
1384 TRAPS) {
1385
1386 assert(cfs != nullptr, "invariant");
1387 assert(cp != nullptr, "invariant");
1388 assert(java_fields_count_ptr != nullptr, "invariant");
1389
1390 assert(nullptr == _fields_annotations, "invariant");
1391 assert(nullptr == _fields_type_annotations, "invariant");
1392
1393 // "inline type" means concrete value class
1394 bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1395 // "value class" can be either abstract or concrete value class
1396 bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1397 cfs->guarantee_more(2, CHECK); // length
1398 const u2 length = cfs->get_u2_fast();
1399 *java_fields_count_ptr = length;
1400
1401 int num_injected = 0;
1402 const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1403 &num_injected);
1404
1405 // Two more slots are required for inline classes:
1406 // - The static field ".null_reset" which carries the nullable flat layout
1407 // representation of null, added below
1408 // - The nonstatic field ".empty" the JVM injects when detecting an empty
1409 // inline class, added in FieldLayoutBuilder::compute_inline_class_layout
1410 // One more slot is required for both abstract value class and inline classes:
1411 // - The static field ".acmp_maps" for acmp and identity hash, tracks
1412 // nonstatic fields both inherited or declared, added below
1413 const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1414 + (is_value_class ? 1 : 0);
1415
1416 // Allocate a temporary resource array to collect field data.
1417 // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1418 _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1419
1420 ResourceMark rm(THREAD);
1421 for (int n = 0; n < length; n++) {
1422 // access_flags, name_index, descriptor_index, attributes_count
1423 cfs->guarantee_more(8, CHECK);
1424
1425 jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1426 if (!supports_inline_types()) {
1427 recognized_modifiers &= ~JVM_ACC_STRICT_INIT;
1428 }
1429
1430 const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1431 verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1432 AccessFlags access_flags;
1433 access_flags.set_flags(flags);
1434 FieldInfo::FieldFlags fieldFlags(0);
1435
1436 const u2 name_index = cfs->get_u2_fast();
1437 guarantee_property(valid_symbol_at(name_index),
1438 "Invalid constant pool index %u for field name in class file %s",
1439 name_index, CHECK);
1440 const Symbol* const name = cp->symbol_at(name_index);
1441 verify_legal_field_name(name, CHECK);
1442
1443 const u2 signature_index = cfs->get_u2_fast();
1444 guarantee_property(valid_symbol_at(signature_index),
1445 "Invalid constant pool index %u for field signature in class file %s",
1446 signature_index, CHECK);
1447 const Symbol* const sig = cp->symbol_at(signature_index);
1448 verify_legal_field_signature(name, sig, CHECK);
1449
1450 u2 constantvalue_index = 0;
1451 bool is_synthetic = false;
1452 u2 generic_signature_index = 0;
1453 const bool is_static = access_flags.is_static();
1454 FieldAnnotationCollector parsed_annotations(_loader_data);
1455
1456 bool is_null_restricted = false;
1457
1458 const u2 attributes_count = cfs->get_u2_fast();
1459 if (attributes_count > 0) {
1460 parse_field_attributes(cfs,
1461 attributes_count,
1462 is_static,
1463 signature_index,
1464 &constantvalue_index,
1465 &is_synthetic,
1466 &generic_signature_index,
1467 &parsed_annotations,
1468 CHECK);
1469
1470 if (parsed_annotations.field_annotations() != nullptr) {
1471 if (_fields_annotations == nullptr) {
1472 _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1473 _loader_data, length, nullptr,
1474 CHECK);
1475 }
1476 _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1477 parsed_annotations.set_field_annotations(nullptr);
1478 if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1479 if (!Signature::has_envelope(sig)) {
1480 Exceptions::fthrow(
1481 THREAD_AND_LOCATION,
1482 vmSymbols::java_lang_ClassFormatError(),
1483 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1484 class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1485 return;
1486 }
1487 if (!supports_inline_types()) {
1488 Exceptions::fthrow(
1489 THREAD_AND_LOCATION,
1490 vmSymbols::java_lang_ClassFormatError(),
1491 "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s in non-preview class file",
1492 class_name()->as_C_string(), name->as_C_string());
1493 return;
1494 }
1495
1496 if ((flags & JVM_ACC_STRICT_INIT) == 0) {
1497 // Inject STRICT_INIT and validate in context
1498 const jint patched_flags = flags | JVM_ACC_STRICT_INIT;
1499 verify_legal_field_modifiers(patched_flags, class_access_flags, CHECK);
1500 access_flags.set_flags(patched_flags);
1501 }
1502 is_null_restricted = true;
1503 }
1504 }
1505 if (parsed_annotations.field_type_annotations() != nullptr) {
1506 if (_fields_type_annotations == nullptr) {
1507 _fields_type_annotations =
1508 MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1509 length,
1510 nullptr,
1511 CHECK);
1512 }
1513 _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1514 parsed_annotations.set_field_type_annotations(nullptr);
1515 }
1516
1517 if (is_synthetic) {
1518 access_flags.set_is_synthetic();
1519 }
1520 if (generic_signature_index != 0) {
1521 fieldFlags.update_generic(true);
1522 }
1523 }
1524
1525 if (is_null_restricted) {
1526 fieldFlags.update_null_free_inline_type(true);
1527 if (is_static) {
1528 _has_null_restricted_static_fields = true;
1529 }
1530 }
1531
1532 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1533
1534 // Update number of static oop fields.
1535 if (is_static && is_reference_type(type)) {
1536 _static_oop_count++;
1537 }
1538
1539 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1540 fi.set_index(n);
1541 if (fieldFlags.is_generic()) {
1542 fi.set_generic_signature_index(generic_signature_index);
1543 }
1544 parsed_annotations.apply_to(&fi);
1545 if (fi.field_flags().is_contended()) {
1546 _has_contended_fields = true;
1547 }
1548 if (access_flags.is_strict() && access_flags.is_static()) {
1549 _has_strict_static_fields = true;
1550 }
1551 _temp_field_info->append(fi);
1552 }
1553 assert(_temp_field_info->length() == length, "Must be");
1554
1555 if (num_injected != 0) {
1556 for (int n = 0; n < num_injected; n++) {
1557 // Check for duplicates
1558 if (injected[n].may_be_java) {
1559 const Symbol* const name = injected[n].name();
1560 const Symbol* const signature = injected[n].signature();
1561 bool duplicate = false;
1562 for (int i = 0; i < length; i++) {
1563 const FieldInfo* const f = _temp_field_info->adr_at(i);
1564 if (name == cp->symbol_at(f->name_index()) &&
1565 signature == cp->symbol_at(f->signature_index())) {
1566 // Symbol is desclared in Java so skip this one
1567 duplicate = true;
1568 break;
1569 }
1570 }
1571 if (duplicate) {
1572 // These will be removed from the field array at the end
1573 continue;
1574 }
1575 }
1576
1577 // Injected field
1578 FieldInfo::FieldFlags fflags(0);
1579 fflags.update_injected(true);
1580 AccessFlags aflags;
1581 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1582 int idx = _temp_field_info->append(fi);
1583 _temp_field_info->adr_at(idx)->set_index(idx);
1584 }
1585 }
1586
1587 if (is_inline_type) {
1588 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1589 // It should never be seen by user code, it is used when writing "null" to a nullable flat field
1590 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1591 // alive.
1592 FieldInfo::FieldFlags fflags2(0);
1593 fflags2.update_injected(true);
1594 AccessFlags aflags2(JVM_ACC_STATIC);
1595 FieldInfo fi2(aflags2,
1596 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1597 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1598 0,
1599 fflags2);
1600 int idx2 = _temp_field_info->append(fi2);
1601 _temp_field_info->adr_at(idx2)->set_index(idx2);
1602 _static_oop_count++;
1603 }
1604 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1605 && _class_name != vmSymbols::java_lang_Object()) {
1606 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1607 FieldInfo::FieldFlags fflags2(0);
1608 fflags2.update_injected(true);
1609 fflags2.update_stable(true);
1610 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1611 FieldInfo fi3(aflags2,
1612 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1613 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1614 0,
1615 fflags2);
1616 int idx2 = _temp_field_info->append(fi3);
1617 _temp_field_info->adr_at(idx2)->set_index(idx2);
1618 _static_oop_count++;
1619 }
1620
1621 if (_need_verify && length > 1) {
1622 // Check duplicated fields
1623 ResourceMark rm(THREAD);
1624 // Set containing name-signature pairs
1625 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1626 for (int i = 0; i < _temp_field_info->length(); i++) {
1627 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1628 _temp_field_info->adr_at(i)->signature(_cp));
1629 // If no duplicates, add name/signature in hashtable names_and_sigs.
1630 if(!names_and_sigs->put(name_and_sig, 0)) {
1631 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1632 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1633 return;
1634 }
1635 }
1636 }
1637 }
1638
1639
1984 }
1985 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1986 if (_location != _in_field && _location != _in_class) {
1987 break; // only allow for fields and classes
1988 }
1989 if (!EnableContended || (RestrictContended && !privileged)) {
1990 break; // honor privileges
1991 }
1992 return _jdk_internal_vm_annotation_Contended;
1993 }
1994 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1995 if (_location != _in_method) break; // only allow for methods
1996 if (RestrictReservedStack && !privileged) break; // honor privileges
1997 return _jdk_internal_vm_annotation_ReservedStackAccess;
1998 }
1999 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
2000 if (_location != _in_class) break; // only allow for classes
2001 if (!privileged) break; // only allow in privileged code
2002 return _jdk_internal_ValueBased;
2003 }
2004 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2005 if (_location != _in_class) break; // only allow for classes
2006 return _jdk_internal_LooselyConsistentValue;
2007 }
2008 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2009 if (_location != _in_field) break; // only allow for fields
2010 return _jdk_internal_NullRestricted;
2011 }
2012 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2013 return _java_lang_Deprecated;
2014 }
2015 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2016 if (_location != _in_class) break; // only allow for classes
2017 if (!privileged) break; // only allow in privileged code
2018 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2019 }
2020 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2021 if (_location != _in_method) break; // only allow for methods
2022 if (!privileged) break; // only allow in privileged code
2023 return _method_AOTRuntimeSetup;
2024 }
2025 default: {
2026 break;
2027 }
2028 }
2029 return AnnotationCollector::_unknown;
2030 }
2031
2272
2273 const u2 signature_index = cfs->get_u2_fast();
2274 guarantee_property(
2275 valid_symbol_at(signature_index),
2276 "Illegal constant pool index %u for method signature in class file %s",
2277 signature_index, CHECK_NULL);
2278 const Symbol* const signature = cp->symbol_at(signature_index);
2279
2280 if (name == vmSymbols::class_initializer_name()) {
2281 // We ignore the other access flags for a valid class initializer.
2282 // (JVM Spec 2nd ed., chapter 4.6)
2283 if (_major_version < 51) { // backward compatibility
2284 flags = JVM_ACC_STATIC;
2285 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2286 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2287 } else {
2288 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2289 return nullptr;
2290 }
2291 } else {
2292 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL);
2293 }
2294
2295 if (name == vmSymbols::object_initializer_name() && is_interface) {
2296 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2297 return nullptr;
2298 }
2299
2300 if (Arguments::is_valhalla_enabled()) {
2301 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2302 && ((flags & JVM_ACC_STATIC) == 0 )
2303 && !_access_flags.is_identity_class()) {
2304 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2305 return nullptr;
2306 }
2307 }
2308
2309 int args_size = -1; // only used when _need_verify is true
2310 if (_need_verify) {
2311 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2312 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2313 verify_legal_method_signature(name, signature, CHECK_NULL);
2314 if (args_size > MAX_ARGS_SIZE) {
2315 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2316 return nullptr;
2317 }
2318 }
2319
2320 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2321
2322 // Default values for code and exceptions attribute elements
2323 u2 max_stack = 0;
2324 u2 max_locals = 0;
2325 u4 code_length = 0;
2326 const u1* code_start = nullptr;
2327 u2 exception_table_length = 0;
2328 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
3112 valid_klass_reference_at(outer_class_info_index),
3113 "outer_class_info_index %u has bad constant type in class file %s",
3114 outer_class_info_index, CHECK_0);
3115
3116 if (outer_class_info_index != 0) {
3117 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3118 char* bytes = (char*)outer_class_name->bytes();
3119 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3120 "Outer class is an array class in class file %s", CHECK_0);
3121 }
3122 // Inner class name
3123 const u2 inner_name_index = cfs->get_u2_fast();
3124 guarantee_property(
3125 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3126 "inner_name_index %u has bad constant type in class file %s",
3127 inner_name_index, CHECK_0);
3128 if (_need_verify) {
3129 guarantee_property(inner_class_info_index != outer_class_info_index,
3130 "Class is both outer and inner class in class file %s", CHECK_0);
3131 }
3132
3133 // Access flags
3134 u2 flags;
3135 // JVM_ACC_MODULE is defined in JDK-9 and later.
3136 if (_major_version >= JAVA_9_VERSION) {
3137 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3138 } else {
3139 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3140 }
3141
3142 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3143 // Set abstract bit for old class files for backward compatibility
3144 flags |= JVM_ACC_ABSTRACT;
3145 }
3146
3147 if (!supports_inline_types()) {
3148 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3149 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3150 if (!is_module && !is_interface) {
3151 flags |= JVM_ACC_IDENTITY;
3152 }
3153 }
3154
3155 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3156 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3157 AccessFlags inner_access_flags(flags);
3158
3159 inner_classes->at_put(index++, inner_class_info_index);
3160 inner_classes->at_put(index++, outer_class_info_index);
3161 inner_classes->at_put(index++, inner_name_index);
3162 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3163 }
3164
3165 // Check for circular and duplicate entries.
3166 bool has_circularity = false;
3167 if (_need_verify) {
3168 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3169 if (has_circularity) {
3170 // If circularity check failed then ignore InnerClasses attribute.
3171 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3172 index = 0;
3173 if (parsed_enclosingmethod_attribute) {
3174 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3240 if (length > 0) {
3241 int index = 0;
3242 cfs->guarantee_more(2 * length, CHECK_0);
3243 for (int n = 0; n < length; n++) {
3244 const u2 class_info_index = cfs->get_u2_fast();
3245 guarantee_property(
3246 valid_klass_reference_at(class_info_index),
3247 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3248 class_info_index, CHECK_0);
3249 permitted_subclasses->at_put(index++, class_info_index);
3250 }
3251 assert(index == size, "wrong size");
3252 }
3253
3254 // Restore buffer's current position.
3255 cfs->set_current(current_mark);
3256
3257 return length;
3258 }
3259
3260 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3261 const u1* const loadable_descriptors_attribute_start,
3262 TRAPS) {
3263 const u1* const current_mark = cfs->current();
3264 u2 length = 0;
3265 if (loadable_descriptors_attribute_start != nullptr) {
3266 cfs->set_current(loadable_descriptors_attribute_start);
3267 cfs->guarantee_more(2, CHECK_0); // length
3268 length = cfs->get_u2_fast();
3269 }
3270 const int size = length;
3271 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3272 _loadable_descriptors = loadable_descriptors;
3273 if (length > 0) {
3274 int index = 0;
3275 cfs->guarantee_more(2 * length, CHECK_0);
3276 for (int n = 0; n < length; n++) {
3277 const u2 descriptor_index = cfs->get_u2_fast();
3278 guarantee_property(
3279 valid_symbol_at(descriptor_index),
3280 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3281 descriptor_index, CHECK_0);
3282 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3283 bool valid = legal_field_signature(descriptor, CHECK_0);
3284 if(!valid) {
3285 ResourceMark rm(THREAD);
3286 Exceptions::fthrow(THREAD_AND_LOCATION,
3287 vmSymbols::java_lang_ClassFormatError(),
3288 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3289 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3290 return 0;
3291 }
3292 loadable_descriptors->at_put(index++, descriptor_index);
3293 }
3294 assert(index == size, "wrong size");
3295 }
3296
3297 // Restore buffer's current position.
3298 cfs->set_current(current_mark);
3299
3300 return length;
3301 }
3302
3303 // Record {
3304 // u2 attribute_name_index;
3305 // u4 attribute_length;
3306 // u2 components_count;
3307 // component_info components[components_count];
3308 // }
3309 // component_info {
3310 // u2 name_index;
3311 // u2 descriptor_index
3312 // u2 attributes_count;
3313 // attribute_info_attributes[attributes_count];
3314 // }
3315 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3316 const ConstantPool* cp,
3317 const u1* const record_attribute_start,
3318 TRAPS) {
3319 const u1* const current_mark = cfs->current();
3320 int components_count = 0;
3321 unsigned int calculate_attr_size = 0;
3322 if (record_attribute_start != nullptr) {
3533 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3534 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3535 "Bad length on BootstrapMethods in class file %s",
3536 CHECK);
3537 }
3538
3539 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3540 ConstantPool* cp,
3541 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3542 TRAPS) {
3543 assert(cfs != nullptr, "invariant");
3544 assert(cp != nullptr, "invariant");
3545 assert(parsed_annotations != nullptr, "invariant");
3546
3547 // Set inner classes attribute to default sentinel
3548 _inner_classes = Universe::the_empty_short_array();
3549 // Set nest members attribute to default sentinel
3550 _nest_members = Universe::the_empty_short_array();
3551 // Set _permitted_subclasses attribute to default sentinel
3552 _permitted_subclasses = Universe::the_empty_short_array();
3553 // Set _loadable_descriptors attribute to default sentinel
3554 _loadable_descriptors = Universe::the_empty_short_array();
3555 cfs->guarantee_more(2, CHECK); // attributes_count
3556 u2 attributes_count = cfs->get_u2_fast();
3557 bool parsed_sourcefile_attribute = false;
3558 bool parsed_innerclasses_attribute = false;
3559 bool parsed_nest_members_attribute = false;
3560 bool parsed_permitted_subclasses_attribute = false;
3561 bool parsed_loadable_descriptors_attribute = false;
3562 bool parsed_nest_host_attribute = false;
3563 bool parsed_record_attribute = false;
3564 bool parsed_enclosingmethod_attribute = false;
3565 bool parsed_bootstrap_methods_attribute = false;
3566 const u1* runtime_visible_annotations = nullptr;
3567 int runtime_visible_annotations_length = 0;
3568 const u1* runtime_visible_type_annotations = nullptr;
3569 int runtime_visible_type_annotations_length = 0;
3570 bool runtime_invisible_type_annotations_exists = false;
3571 bool runtime_invisible_annotations_exists = false;
3572 bool parsed_source_debug_ext_annotations_exist = false;
3573 const u1* inner_classes_attribute_start = nullptr;
3574 u4 inner_classes_attribute_length = 0;
3575 u2 enclosing_method_class_index = 0;
3576 u2 enclosing_method_method_index = 0;
3577 const u1* nest_members_attribute_start = nullptr;
3578 u4 nest_members_attribute_length = 0;
3579 const u1* record_attribute_start = nullptr;
3580 u4 record_attribute_length = 0;
3581 const u1* permitted_subclasses_attribute_start = nullptr;
3582 u4 permitted_subclasses_attribute_length = 0;
3583 const u1* loadable_descriptors_attribute_start = nullptr;
3584 u4 loadable_descriptors_attribute_length = 0;
3585
3586 // Iterate over attributes
3587 while (attributes_count--) {
3588 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3589 const u2 attribute_name_index = cfs->get_u2_fast();
3590 const u4 attribute_length = cfs->get_u4_fast();
3591 guarantee_property(
3592 valid_symbol_at(attribute_name_index),
3593 "Attribute name has bad constant pool index %u in class file %s",
3594 attribute_name_index, CHECK);
3595 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3596 if (tag == vmSymbols::tag_source_file()) {
3597 // Check for SourceFile tag
3598 if (_need_verify) {
3599 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3600 }
3601 if (parsed_sourcefile_attribute) {
3602 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3603 return;
3604 } else {
3780 return;
3781 }
3782 parsed_record_attribute = true;
3783 record_attribute_start = cfs->current();
3784 record_attribute_length = attribute_length;
3785 } else if (_major_version >= JAVA_17_VERSION) {
3786 if (tag == vmSymbols::tag_permitted_subclasses()) {
3787 if (parsed_permitted_subclasses_attribute) {
3788 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3789 return;
3790 }
3791 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3792 if (_access_flags.is_final()) {
3793 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3794 return;
3795 }
3796 parsed_permitted_subclasses_attribute = true;
3797 permitted_subclasses_attribute_start = cfs->current();
3798 permitted_subclasses_attribute_length = attribute_length;
3799 }
3800 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3801 if (parsed_loadable_descriptors_attribute) {
3802 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3803 return;
3804 }
3805 parsed_loadable_descriptors_attribute = true;
3806 loadable_descriptors_attribute_start = cfs->current();
3807 loadable_descriptors_attribute_length = attribute_length;
3808 }
3809 }
3810 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3811 cfs->skip_u1(attribute_length, CHECK);
3812 } else {
3813 // Unknown attribute
3814 cfs->skip_u1(attribute_length, CHECK);
3815 }
3816 } else {
3817 // Unknown attribute
3818 cfs->skip_u1(attribute_length, CHECK);
3819 }
3820 } else {
3821 // Unknown attribute
3822 cfs->skip_u1(attribute_length, CHECK);
3823 }
3824 }
3825 _class_annotations = allocate_annotations(runtime_visible_annotations,
3826 runtime_visible_annotations_length,
3827 CHECK);
3828 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3865 CHECK);
3866 if (_need_verify) {
3867 guarantee_property(record_attribute_length == calculated_attr_length,
3868 "Record attribute has wrong length in class file %s",
3869 CHECK);
3870 }
3871 }
3872
3873 if (parsed_permitted_subclasses_attribute) {
3874 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3875 cfs,
3876 permitted_subclasses_attribute_start,
3877 CHECK);
3878 if (_need_verify) {
3879 guarantee_property(
3880 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3881 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3882 }
3883 }
3884
3885 if (parsed_loadable_descriptors_attribute) {
3886 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3887 cfs,
3888 loadable_descriptors_attribute_start,
3889 CHECK);
3890 if (_need_verify) {
3891 guarantee_property(
3892 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3893 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3894 }
3895 }
3896
3897 if (_max_bootstrap_specifier_index >= 0) {
3898 guarantee_property(parsed_bootstrap_methods_attribute,
3899 "Missing BootstrapMethods attribute in class file %s", CHECK);
3900 }
3901 }
3902
3903 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3904 assert(k != nullptr, "invariant");
3905
3906 if (_synthetic_flag)
3907 k->set_is_synthetic();
3908 if (_sourcefile_index != 0) {
3909 k->set_source_file_name_index(_sourcefile_index);
3910 }
3911 if (_generic_signature_index != 0) {
3912 k->set_generic_signature_index(_generic_signature_index);
3913 }
3914 if (_sde_buffer != nullptr) {
3915 k->set_source_debug_extension(_sde_buffer, _sde_length);
3916 }
3943 _class_type_annotations = nullptr;
3944 _fields_annotations = nullptr;
3945 _fields_type_annotations = nullptr;
3946 }
3947
3948 // Transfer ownership of metadata allocated to the InstanceKlass.
3949 void ClassFileParser::apply_parsed_class_metadata(
3950 InstanceKlass* this_klass,
3951 int java_fields_count) {
3952 assert(this_klass != nullptr, "invariant");
3953
3954 _cp->set_pool_holder(this_klass);
3955 this_klass->set_constants(_cp);
3956 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3957 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3958 this_klass->set_fields_status(_fields_status);
3959 this_klass->set_methods(_methods);
3960 this_klass->set_inner_classes(_inner_classes);
3961 this_klass->set_nest_members(_nest_members);
3962 this_klass->set_nest_host_index(_nest_host);
3963 this_klass->set_loadable_descriptors(_loadable_descriptors);
3964 this_klass->set_annotations(_combined_annotations);
3965 this_klass->set_permitted_subclasses(_permitted_subclasses);
3966 this_klass->set_record_components(_record_components);
3967 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3968
3969 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3970
3971 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3972 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3973 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3974 // its _super. If an OOM occurs while loading the current klass, its _super field
3975 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3976 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3977 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3978
3979 // Clear out these fields so they don't get deallocated by the destructor
3980 clear_class_metadata();
3981 }
3982
3983 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3984 int anno_length,
3985 TRAPS) {
3986 AnnotationArray* annotations = nullptr;
3987 if (anno != nullptr) {
3988 annotations = MetadataFactory::new_array<u1>(_loader_data,
3989 anno_length,
3990 CHECK_(annotations));
3991 for (int i = 0; i < anno_length; i++) {
3992 annotations->at_put(i, anno[i]);
3993 }
3994 }
3995 return annotations;
3996 }
3997
3998 void ClassFileParser::check_super_class(ConstantPool* const cp,
3999 const int super_class_index,
4000 const bool need_verify,
4001 TRAPS) {
4002 assert(cp != nullptr, "invariant");
4003
4004 if (super_class_index == 0) {
4005 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
4006 "Invalid superclass index 0 in class file %s",
4007 CHECK);
4008 } else {
4009 guarantee_property(valid_klass_reference_at(super_class_index),
4010 "Invalid superclass index %u in class file %s",
4011 super_class_index,
4012 CHECK);
4013
4014 // The class name should be legal because it is checked when parsing constant pool.
4015 // However, make sure it is not an array type.
4016 if (need_verify) {
4017 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4018 "Bad superclass name in class file %s", CHECK);
4019 }
4020 }
4021 }
4022
4023 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4024 _max_nonstatic_oop_maps = max_blocks;
4025 _nonstatic_oop_map_count = 0;
4026 if (max_blocks == 0) {
4178 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4179 assert(ik->size_helper() > 0, "layout_helper is initialized");
4180 if (ik->is_abstract() || ik->is_interface()
4181 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4182 || ik->size_helper() >= FastAllocateSizeLimit) {
4183 // Forbid fast-path allocation.
4184 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4185 ik->set_layout_helper(lh);
4186 }
4187
4188 // Propagate the AOT runtimeSetup method discovery
4189 if (_has_aot_runtime_setup_method) {
4190 ik->set_is_runtime_setup_required();
4191 if (log_is_enabled(Info, aot, init)) {
4192 ResourceMark rm;
4193 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4194 }
4195 }
4196 }
4197
4198 bool ClassFileParser::supports_inline_types() const {
4199 // Inline types are only supported by class file version 71.65535 and later
4200 return _major_version > JAVA_27_VERSION ||
4201 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4202 }
4203
4204 // utility methods for appending an array with check for duplicates
4205
4206 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4207 const Array<InstanceKlass*>* const ifs) {
4208 // iterate over new interfaces
4209 for (int i = 0; i < ifs->length(); i++) {
4210 InstanceKlass* const e = ifs->at(i);
4211 assert(e->is_klass() && e->is_interface(), "just checking");
4212 // add new interface
4213 result->append_if_missing(e);
4214 }
4215 }
4216
4217 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4218 Array<InstanceKlass*>* local_ifs,
4219 ClassLoaderData* loader_data,
4220 TRAPS) {
4221 assert(local_ifs != nullptr, "invariant");
4222 assert(loader_data != nullptr, "invariant");
4223
4250 } else {
4251 ResourceMark rm;
4252 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4253
4254 // Copy down from superclass
4255 if (super != nullptr) {
4256 append_interfaces(result, super->transitive_interfaces());
4257 }
4258
4259 // Copy down from local interfaces' superinterfaces
4260 for (int i = 0; i < local_size; i++) {
4261 InstanceKlass* const l = local_ifs->at(i);
4262 append_interfaces(result, l->transitive_interfaces());
4263 }
4264 // Finally add local interfaces
4265 append_interfaces(result, local_ifs);
4266
4267 // length will be less than the max_transitive_size if duplicates were removed
4268 const int length = result->length();
4269 assert(length <= max_transitive_size, "just checking");
4270
4271 Array<InstanceKlass*>* const new_result =
4272 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4273 for (int i = 0; i < length; i++) {
4274 InstanceKlass* const e = result->at(i);
4275 assert(e != nullptr, "just checking");
4276 new_result->at_put(i, e);
4277 }
4278 return new_result;
4279 }
4280 }
4281
4282 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4283 assert(this_klass != nullptr, "invariant");
4284 const InstanceKlass* const super = this_klass->super();
4285
4286 if (super != nullptr) {
4287 if (super->is_final()) {
4288 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4289 return;
4290 }
4291
4292 if (super->is_sealed()) {
4293 stringStream ss;
4294 ResourceMark rm(THREAD);
4295 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4296 classfile_icce_error(ss.as_string(), THREAD);
4297 return;
4298 }
4299 }
4300
4301 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4302 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4303 // for value classes. So, it is treated as a special case for now.
4304 if (!this_klass->access_flags().is_identity_class() &&
4305 super->name() != vmSymbols::java_lang_Object() &&
4306 super->is_identity_class()) {
4307 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4308 return;
4309 }
4310
4311 Reflection::VerifyClassAccessResults vca_result =
4312 Reflection::verify_class_access(this_klass, super, false);
4313 if (vca_result != Reflection::ACCESS_OK) {
4314 ResourceMark rm(THREAD);
4315 char* msg = Reflection::verify_class_access_msg(this_klass,
4316 super,
4317 vca_result);
4318
4319 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4320 if (msg == nullptr) {
4321 bool same_module = (this_klass->module() == super->module());
4322 Exceptions::fthrow(
4323 THREAD_AND_LOCATION,
4324 vmSymbols::java_lang_IllegalAccessError(),
4325 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4326 this_klass->external_name(),
4327 super->is_abstract() ? "abstract " : "",
4328 super->external_name(),
4329 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4330 (same_module) ? "" : "; ",
4483 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4484 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4485 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4486 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4487 if (is_module) {
4488 ResourceMark rm(THREAD);
4489 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4490 Exceptions::fthrow(
4491 THREAD_AND_LOCATION,
4492 vmSymbols::java_lang_NoClassDefFoundError(),
4493 "%s is not a class because access_flag ACC_MODULE is set",
4494 _class_name->as_C_string());
4495 return;
4496 }
4497
4498 if (!_need_verify) { return; }
4499
4500 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4501 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4502 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4503 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4504 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4505 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4506 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4507 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final));
4508
4509 if ((is_abstract && is_final) ||
4510 (is_interface && !is_abstract) ||
4511 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4512 (!is_interface && major_gte_1_5 && is_annotation) ||
4513 (!valid_value_class)) {
4514 ResourceMark rm(THREAD);
4515 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4516 if (inner_name == nullptr && !is_anonymous_inner_class) {
4517 Exceptions::fthrow(
4518 THREAD_AND_LOCATION,
4519 vmSymbols::java_lang_ClassFormatError(),
4520 "Illegal class modifiers in class %s: 0x%X",
4521 _class_name->as_C_string(), flags
4522 );
4523 } else {
4524 if (is_anonymous_inner_class) {
4525 Exceptions::fthrow(
4526 THREAD_AND_LOCATION,
4527 vmSymbols::java_lang_ClassFormatError(),
4528 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4529 _class_name->as_C_string(), flags
4530 );
4531 } else {
4532 Exceptions::fthrow(
4533 THREAD_AND_LOCATION,
4588 THREAD_AND_LOCATION,
4589 vmSymbols::java_lang_UnsupportedClassVersionError(),
4590 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4591 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4592 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4593 return;
4594 }
4595
4596 if (!Arguments::enable_preview()) {
4597 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4598 class_name, major, minor, THREAD);
4599 return;
4600 }
4601
4602 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4603 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4604 class_name, major, minor, THREAD);
4605 }
4606 }
4607
4608 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4609 AccessFlags class_access_flags,
4610 TRAPS) const {
4611 if (!_need_verify) { return; }
4612
4613 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4614 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4615 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4616 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4617 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4618 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4619 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4620 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4621 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4622 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4623
4624 const bool is_interface = class_access_flags.is_interface();
4625 const bool is_identity_class = class_access_flags.is_identity_class();
4626
4627 bool is_illegal = false;
4628 const char* error_msg = "";
4629
4630 // There is some overlap in the checks that apply, for example interface fields
4631 // must be static, static fields can't be strict, and therefore interfaces can't
4632 // have strict fields. So we don't have to check every possible invalid combination
4633 // individually as long as all are covered. Once we have found an illegal combination
4634 // we can stop checking.
4635
4636 if (!is_illegal) {
4637 if (is_interface) {
4638 if (!is_public || !is_static || !is_final || is_private ||
4639 is_protected || is_volatile || is_transient ||
4640 (major_gte_1_5 && is_enum)) {
4641 is_illegal = true;
4642 error_msg = "interface fields must be public, static and final, and may be synthetic";
4643 }
4644 } else { // not interface
4645 if (has_illegal_visibility(flags)) {
4646 is_illegal = true;
4647 error_msg = "invalid visibility flags for class field";
4648 } else if (is_final && is_volatile) {
4649 is_illegal = true;
4650 error_msg = "fields cannot be final and volatile";
4651 } else if (supports_inline_types()) {
4652 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4653 is_illegal = true;
4654 error_msg = "value class fields must be either non-static final and strict, or static";
4655 }
4656 }
4657 }
4658 }
4659
4660 if (is_illegal) {
4661 ResourceMark rm(THREAD);
4662 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4663 Exceptions::fthrow(
4664 THREAD_AND_LOCATION,
4665 vmSymbols::java_lang_ClassFormatError(),
4666 "Illegal field modifiers (%s) in class %s: 0x%X",
4667 error_msg, _class_name->as_C_string(), flags);
4668 return;
4669 }
4670 }
4671
4672 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4673 AccessFlags class_access_flags,
4674 const Symbol* name,
4675 TRAPS) const {
4676 if (!_need_verify) { return; }
4677
4678 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4679 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4680 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4681 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4682 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4683 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4684 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4685 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4686 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4687 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4688 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4689 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4690 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4691 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4692 const bool is_interface = class_access_flags.is_interface();
4693 const bool is_identity_class = class_access_flags.is_identity_class();
4694
4695 bool is_illegal = false;
4696 const char* class_note = "";
4697
4698 if (is_interface) {
4699 if (major_gte_8) {
4700 // Class file version is JAVA_8_VERSION or later Methods of
4701 // interfaces may set any of the flags except ACC_PROTECTED,
4702 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4703 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4704 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4705 (is_native || is_protected || is_final || is_synchronized) ||
4706 // If a specific method of a class or interface has its
4707 // ACC_ABSTRACT flag set, it must not have any of its
4708 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4709 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4710 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4711 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4712 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4713 is_illegal = true;
4714 }
4715 } else if (major_gte_1_5) {
4716 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4717 if (!is_public || is_private || is_protected || is_static || is_final ||
4718 is_synchronized || is_native || !is_abstract || is_strict) {
4719 is_illegal = true;
4720 }
4721 } else {
4722 // Class file version is pre-JAVA_1_5_VERSION
4723 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4724 is_illegal = true;
4725 }
4726 }
4727 } else { // not interface
4728 if (has_illegal_visibility(flags)) {
4729 is_illegal = true;
4730 } else {
4731 if (is_initializer) {
4732 if (is_static || is_final || is_synchronized || is_native ||
4733 is_abstract || (major_gte_1_5 && is_bridge)) {
4734 is_illegal = true;
4735 }
4736 } else { // not initializer
4737 if (!is_identity_class && is_synchronized && !is_static) {
4738 is_illegal = true;
4739 class_note = " (not an identity class)";
4740 } else {
4741 if (is_abstract) {
4742 if ((is_final || is_native || is_private || is_static ||
4743 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4744 is_illegal = true;
4745 }
4746 }
4747 }
4748 }
4749 }
4750 }
4751
4752 if (is_illegal) {
4753 ResourceMark rm(THREAD);
4754 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4755 Exceptions::fthrow(
4756 THREAD_AND_LOCATION,
4757 vmSymbols::java_lang_ClassFormatError(),
4758 "Method %s in class %s%s has illegal modifiers: 0x%X",
4759 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
4760 return;
4761 }
4762 }
4763
4764 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4765 int length,
4766 TRAPS) const {
4767 assert(_need_verify, "only called when _need_verify is true");
4768 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4769 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4770 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4771 }
4772 }
4773
4774 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4775 // In class names, '/' separates unqualified names. This is verified in this function also.
4776 // Method names also may not contain the characters '<' or '>', unless <init>
4777 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4778 // method. Because these names have been checked as special cases before
4779 // calling this method in verify_legal_method_name.
4797 if (type == ClassFileParser::LegalClass) {
4798 if (p == name || p+1 >= name+length ||
4799 *(p+1) == JVM_SIGNATURE_SLASH) {
4800 return false;
4801 }
4802 } else {
4803 return false; // do not permit '/' unless it's class name
4804 }
4805 break;
4806 case JVM_SIGNATURE_SPECIAL:
4807 case JVM_SIGNATURE_ENDSPECIAL:
4808 // do not permit '<' or '>' in method names
4809 if (type == ClassFileParser::LegalMethod) {
4810 return false;
4811 }
4812 }
4813 }
4814 return true;
4815 }
4816
4817 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4818 if (_loadable_descriptors == nullptr) return false;
4819 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4820 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4821 if (class_name == klass) return true;
4822 }
4823 return false;
4824 }
4825
4826 // Take pointer to a UTF8 byte string (not NUL-terminated).
4827 // Skip over the longest part of the string that could
4828 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4829 // Return a pointer to just past the fieldname.
4830 // Return null if no fieldname at all was found, or in the case of slash_ok
4831 // being true, we saw consecutive slashes (meaning we were looking for a
4832 // qualified path but found something that was badly-formed).
4833 static const char* skip_over_field_name(const char* const name,
4834 bool slash_ok,
4835 unsigned int length) {
4836 const char* p;
4837 jboolean last_is_slash = false;
4838 jboolean not_first_ch = false;
4839
4840 for (p = name; p != name + length; not_first_ch = true) {
4841 const char* old_p = p;
4842 jchar ch = *p;
4843 if (ch < 128) {
4844 p++;
4845 // quick check for ascii
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 // See the declarations of _fast_acmp_offset and _fast_acmp_mask in InlineKlass::Members
5361 // for details about the fast path logic, and the meaning of these values.
5362 void ClassFileParser::set_fast_acmp_members(InlineKlass* vk) const {
5363 if (_layout_info->_oop_acmp_map->length() > 0) { // Oops are not allowed in the fast path
5364 return;
5365 }
5366
5367 int64_t mask = 0;
5368 #ifndef VM_LITTLE_ENDIAN
5369 // Leaving the mask and offset to default values (that is just "return;") is a correct and easy way to implement
5370 // this for other endianness, but it will have a runtime cost in do_acmp, without the benefit. It is better, and
5371 // probably easy with access to such an architecture, to adapt the logic below
5372 // for big-endian architectures, but filling the mask from the other end. I prefer not to do it blindly.
5373 vk->set_fast_acmp_offset(0);
5374 vk->set_fast_acmp_mask(mask);
5375
5376 #else
5377
5378 // Compute the mask for a memory zone with offset "start" and of size "size", both in bytes,
5379 // assuming it won't overflow the long. In little endian, the byte with smallest address/smallest offset/closest from header
5380 // will be the least significant byte.
5381 // Value Memory layout
5382 // make_mask_piece(0, 1) = 0x0000 0000 0000 00ff => ff | 00 | 00 | 00 | 00 | 00 | 00 | 00
5383 // make_mask_piece(0, 1) = 0x0000 0000 0000 ffff => ff | ff | 00 | 00 | 00 | 00 | 00 | 00
5384 // make_mask_piece(1, 1) = 0x0000 0000 0000 ff00 => 00 | ff | 00 | 00 | 00 | 00 | 00 | 00
5385 // make_mask_piece(1, 3) = 0x0000 0000 ffff ff00 => 00 | ff | ff | ff | 00 | 00 | 00 | 00
5386 auto make_mask_piece = [](int start, int size) -> int64_t { return right_n_bits<int64_t>(size * BitsPerByte) << (start * BitsPerByte); };
5387
5388 // We build the mask for a 64-bit load from the start of the payload. For each contiguous piece of memory
5389 // we build the mask containing 1's where it would be in the loaded long: it must be as
5390 // long as the memory that is being accessed, but the placement depends on the endianness.
5391 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5392 int piece_start = _layout_info->_nonoop_acmp_map->at(i)._offset - _layout_info->_payload_offset;
5393 int piece_size = _layout_info->_nonoop_acmp_map->at(i)._size;
5394 int piece_end = piece_start + piece_size - 1;
5395 if (piece_end >= BytesPerLong) { // Too far! Can't fit in an 8-byte load, fast path will not be taken
5396 return;
5397 }
5398 int64_t mask_piece = make_mask_piece(piece_start, piece_size);
5399 mask |= mask_piece;
5400 }
5401
5402 // If the payload is smaller than 64 bits, reading a long after the header can lead to an over-read. To avoid that, we can move the
5403 // load to a lower offset (toward the beginning of the object), and adjust the mask accordingly, even if it means reading (part of)
5404 // the header: the mask will filter that out.
5405 // Since an object cannot be less than 8 bytes, it's surely safe.
5406 if (mask == 0) {
5407 // Special case: empty object. There is nothing to compare, and no payload. We can just read from the start
5408 // of the header to ensure we load within the object. We can't use the general case: count_leading_zeros/count_trailing_zeros doesn't
5409 // accept null argument. This case is endianness-agnostic.
5410 vk->set_fast_acmp_offset(0);
5411 vk->set_fast_acmp_mask(mask);
5412 } else {
5413 // In little endian, if the payload is not a full 64 bits, the mask will have leading 0s (most significant bytes are bytes with
5414 // higher addresses/higher offset/further from the header). We can shift the mask so that there aren't leading 0s anymore, and
5415 // decrease the offset by the same amount.
5416 // For instance, let's say _payload_offset is 16, and the mask is 0x0000 ffff ffff 00ff, we have 16 leading 0s
5417 // (the bubble at offset 1 is fine: it might be due to padding). Reading from the start of the payload might read 2 bytes
5418 // after the end of the payload. To avoid that, we are going to shift the payload by 16 bits, and remove 2 bytes
5419 // from the offset we should load from. At the end, fast_acmp_offset will be 14 and the mask 0xffff ffff 00ff 0000.
5420 // The lowest 16 0s introduced by the shift will filter out the 2 bytes we read from the header.
5421 // Big endian architectures probably need to look at count_trailing_zeros, and shift right until the last bit is 1.
5422 // The offset still needs to be decreased.
5423 int leading_zeroes = static_cast<int>(count_leading_zeros(mask));
5424 assert(leading_zeroes % BitsPerByte == 0, "we should mask full bytes");
5425 mask <<= leading_zeroes;
5426 assert(count_leading_zeros(mask) == 0, "fast acmp mask can be moved further!");
5427 int offset = _layout_info->_payload_offset - leading_zeroes / BitsPerByte;
5428 assert(offset >= 0, "fast acmp path shouldn't load before the object");
5429 vk->set_fast_acmp_offset(offset);
5430 vk->set_fast_acmp_mask(mask);
5431 }
5432 #endif // VM_LITTLE_ENDIAN
5433 }
5434
5435 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5436 bool changed_by_loadhook,
5437 const ClassInstanceInfo& cl_inst_info,
5438 TRAPS) {
5439 assert(ik != nullptr, "invariant");
5440
5441 // Set name and CLD before adding to CLD
5442 ik->set_class_loader_data(_loader_data);
5443 ik->set_class_loader_type();
5444 ik->set_name(_class_name);
5445
5446 // Add all classes to our internal class loader list here,
5447 // including classes in the bootstrap (null) class loader.
5448 const bool publicize = !is_internal();
5449
5450 _loader_data->add_class(ik, publicize);
5451
5452 set_klass_to_deallocate(ik);
5453
5454 assert(_layout_info != nullptr, "invariant");
5455 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5456 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5457 "sanity");
5458
5459 assert(ik->is_instance_klass(), "sanity");
5460 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5461
5462 // Fill in information already parsed
5463 ik->set_should_verify_class(_need_verify);
5464
5465 // Not yet: supers are done below to support the new subtype-checking fields
5466 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5467 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5468 ik->set_has_strict_static_fields(_has_strict_static_fields);
5469
5470 if (_layout_info->_is_naturally_atomic) {
5471 ik->set_is_naturally_atomic();
5472 }
5473
5474 if (_layout_info->_must_be_atomic) {
5475 ik->set_must_be_atomic();
5476 }
5477
5478 ik->set_static_oop_field_count(_static_oop_count);
5479
5480 if (_has_null_restricted_static_fields) {
5481 ik->set_has_null_restricted_static_fields();
5482 for (int i = 0; i < _temp_field_info->length(); i++) {
5483 FieldInfo& fieldinfo = _temp_field_info->at(i);
5484 if (fieldinfo.access_flags().is_static() && fieldinfo.field_flags().is_null_free_inline_type()) {
5485 Symbol* sig = fieldinfo.signature(_cp);
5486 assert(Signature::has_envelope(sig), "Must already have been checked");
5487 TempNewSymbol name = Signature::strip_envelope(sig);
5488 if (name == _class_name) {
5489 // Replace the nullptr previously stored now that we have the InstanceKlass for this klass.
5490 _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(ik));
5491 }
5492 assert(_inline_layout_info_array->adr_at(fieldinfo.index())->klass()->is_inline_klass(), "Must be");
5493 }
5494 }
5495 }
5496
5497 // this transfers ownership of a lot of arrays from
5498 // the parser onto the InstanceKlass*
5499 apply_parsed_class_metadata(ik, _java_fields_count);
5500
5501 // can only set dynamic nest-host after static nest information is set
5502 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5503 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5504 }
5505
5506 // note that is not safe to use the fields in the parser from this point on
5507 assert(nullptr == _cp, "invariant");
5508 assert(nullptr == _fieldinfo_stream, "invariant");
5509 assert(nullptr == _fieldinfo_search_table, "invariant");
5510 assert(nullptr == _fields_status, "invariant");
5511 assert(nullptr == _methods, "invariant");
5512 assert(nullptr == _inner_classes, "invariant");
5513 assert(nullptr == _nest_members, "invariant");
5514 assert(nullptr == _loadable_descriptors, "invariant");
5515 assert(nullptr == _combined_annotations, "invariant");
5516 assert(nullptr == _record_components, "invariant");
5517 assert(nullptr == _permitted_subclasses, "invariant");
5518 assert(nullptr == _inline_layout_info_array, "invariant");
5519
5520 if (_has_localvariable_table) {
5521 ik->set_has_localvariable_table(true);
5522 }
5523
5524 if (_has_final_method) {
5525 ik->set_has_final_method();
5526 }
5527
5528 ik->copy_method_ordering(_method_ordering, CHECK);
5529 // The InstanceKlass::_methods_jmethod_ids cache
5530 // is managed on the assumption that the initial cache
5531 // size is equal to the number of methods in the class. If
5532 // that changes, then InstanceKlass::idnum_can_increment()
5533 // has to be changed accordingly.
5534 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5535
5536 ik->set_this_class_index(_this_class_index);
5537
5538 if (_is_hidden) {
5575 if ((_num_miranda_methods > 0) ||
5576 // if this class introduced new miranda methods or
5577 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5578 // super class exists and this class inherited miranda methods
5579 ) {
5580 ik->set_has_miranda_methods(); // then set a flag
5581 }
5582
5583 // Fill in information needed to compute superclasses.
5584 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5585 ik->set_transitive_interfaces(_transitive_interfaces);
5586 ik->set_local_interfaces(_local_interfaces);
5587 _transitive_interfaces = nullptr;
5588 _local_interfaces = nullptr;
5589
5590 // Initialize itable offset tables
5591 klassItable::setup_itable_offset_table(ik);
5592
5593 // Compute transitive closure of interfaces this class implements
5594 // Do final class setup
5595 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5596 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5597 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5598 }
5599
5600 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5601 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5602 ik->set_has_contended_annotations(true);
5603 }
5604
5605 // Fill in has_finalizer and layout_helper
5606 set_precomputed_flags(ik);
5607
5608 // check if this class can access its super class
5609 check_super_class_access(ik, CHECK);
5610
5611 // check if this class can access its superinterfaces
5612 check_super_interface_access(ik, CHECK);
5613
5614 // check if this class overrides any final method
5615 check_final_method_override(ik, CHECK);
5636
5637 assert(_all_mirandas != nullptr, "invariant");
5638
5639 // Generate any default methods - default methods are public interface methods
5640 // that have a default implementation. This is new with Java 8.
5641 if (_has_nonstatic_concrete_methods) {
5642 DefaultMethods::generate_default_methods(ik,
5643 _all_mirandas,
5644 CHECK);
5645 }
5646
5647 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5648 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5649 !module_entry->has_default_read_edges()) {
5650 if (!module_entry->set_has_default_read_edges()) {
5651 // We won a potential race
5652 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5653 }
5654 }
5655
5656 if (is_inline_type()) {
5657 InlineKlass* vk = InlineKlass::cast(ik);
5658 vk->set_payload_alignment(_layout_info->_payload_alignment);
5659 vk->set_payload_offset(_layout_info->_payload_offset);
5660 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5661 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5662 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5663 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5664 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5665 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5666 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5667 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5668 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5669
5670 if (UseAcmpFastPath) {
5671 set_fast_acmp_members(vk);
5672 }
5673
5674 vk->initialize_calling_convention(CHECK);
5675 }
5676
5677 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5678 && _class_name != vmSymbols::java_lang_Object()) {
5679 // Both abstract and concrete value classes need a field map for acmp
5680 create_acmp_maps(ik, CHECK);
5681 }
5682
5683 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5684
5685 if (!is_internal()) {
5686 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5687 if (CDSConfig::is_dumping_archive()) {
5688 SystemDictionaryShared::check_code_source(ik, _stream);
5689 }
5690
5691 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5692 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5693 log_is_enabled(Info, class, preview)) {
5694 ResourceMark rm;
5695 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5696 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5697 }
5698
5699 if (log_is_enabled(Debug, class, resolve)) {
5700 ResourceMark rm;
5701 // print out the superclass.
5702 const char * from = ik->external_name();
5746 const ClassLoadInfo* cl_info,
5747 Publicity pub_level,
5748 TRAPS) :
5749 _stream(stream),
5750 _class_name(nullptr),
5751 _loader_data(loader_data),
5752 _is_hidden(cl_info->is_hidden()),
5753 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5754 _orig_cp_size(0),
5755 _static_oop_count(0),
5756 _super_klass(),
5757 _cp(nullptr),
5758 _fieldinfo_stream(nullptr),
5759 _fieldinfo_search_table(nullptr),
5760 _fields_status(nullptr),
5761 _methods(nullptr),
5762 _inner_classes(nullptr),
5763 _nest_members(nullptr),
5764 _nest_host(0),
5765 _permitted_subclasses(nullptr),
5766 _loadable_descriptors(nullptr),
5767 _record_components(nullptr),
5768 _local_interfaces(nullptr),
5769 _transitive_interfaces(nullptr),
5770 _combined_annotations(nullptr),
5771 _class_annotations(nullptr),
5772 _class_type_annotations(nullptr),
5773 _fields_annotations(nullptr),
5774 _fields_type_annotations(nullptr),
5775 _klass(nullptr),
5776 _klass_to_deallocate(nullptr),
5777 _parsed_annotations(nullptr),
5778 _layout_info(nullptr),
5779 _inline_layout_info_array(nullptr),
5780 _temp_field_info(nullptr),
5781 _method_ordering(nullptr),
5782 _all_mirandas(nullptr),
5783 _vtable_size(0),
5784 _itable_size(0),
5785 _num_miranda_methods(0),
5786 _protection_domain(cl_info->protection_domain()),
5787 _access_flags(),
5788 _pub_level(pub_level),
5789 _bad_constant_seen(0),
5790 _synthetic_flag(false),
5791 _sde_length(false),
5792 _sde_buffer(nullptr),
5793 _sourcefile_index(0),
5794 _generic_signature_index(0),
5795 _major_version(0),
5796 _minor_version(0),
5797 _this_class_index(0),
5798 _super_class_index(0),
5799 _itfs_len(0),
5800 _java_fields_count(0),
5801 _need_verify(false),
5802 _has_nonstatic_concrete_methods(false),
5803 _declares_nonstatic_concrete_methods(false),
5804 _has_localvariable_table(false),
5805 _has_final_method(false),
5806 _has_contended_fields(false),
5807 _has_aot_runtime_setup_method(false),
5808 _has_strict_static_fields(false),
5809 _has_null_restricted_static_fields(false),
5810 _must_be_atomic(true),
5811 _has_finalizer(false),
5812 _has_empty_finalizer(false),
5813 _max_bootstrap_specifier_index(-1) {
5814
5815 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5816 _class_name->increment_refcount();
5817
5818 assert(_loader_data != nullptr, "invariant");
5819 assert(stream != nullptr, "invariant");
5820 assert(_stream != nullptr, "invariant");
5821 assert(_stream->buffer() == _stream->current(), "invariant");
5822 assert(_class_name != nullptr, "invariant");
5823 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5824
5825 // Figure out whether we can skip format checking (matching classic VM behavior)
5826 // Always verify CFLH bytes from the user agents.
5827 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5828
5829 // synch back verification state to stream to check for truncation.
5830 stream->set_need_verify(_need_verify);
5831
5832 parse_stream(stream, CHECK);
5833
5834 post_process_parsed_stream(stream, _cp, CHECK);
5835 }
5836
5837 void ClassFileParser::clear_class_metadata() {
5838 // metadata created before the instance klass is created. Must be
5839 // deallocated if classfile parsing returns an error.
5840 _cp = nullptr;
5841 _fieldinfo_stream = nullptr;
5842 _fieldinfo_search_table = nullptr;
5843 _fields_status = nullptr;
5844 _methods = nullptr;
5845 _inner_classes = nullptr;
5846 _nest_members = nullptr;
5847 _permitted_subclasses = nullptr;
5848 _loadable_descriptors = nullptr;
5849 _combined_annotations = nullptr;
5850 _class_annotations = _class_type_annotations = nullptr;
5851 _fields_annotations = _fields_type_annotations = nullptr;
5852 _record_components = nullptr;
5853 _inline_layout_info_array = nullptr;
5854 }
5855
5856 // Destructor to clean up
5857 ClassFileParser::~ClassFileParser() {
5858 _class_name->decrement_refcount();
5859
5860 if (_cp != nullptr) {
5861 MetadataFactory::free_metadata(_loader_data, _cp);
5862 }
5863
5864 if (_fieldinfo_stream != nullptr) {
5865 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5866 }
5867 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5868
5869 if (_fields_status != nullptr) {
5870 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5871 }
5872
5873 if (_inline_layout_info_array != nullptr) {
5874 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5875 }
5876
5877 if (_methods != nullptr) {
5878 // Free methods
5879 InstanceKlass::deallocate_methods(_loader_data, _methods);
5880 }
5881
5882 // beware of the Universe::empty_blah_array!!
5883 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5884 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5885 }
5886
5887 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5888 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5889 }
5890
5891 if (_record_components != nullptr) {
5892 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5893 }
5894
5895 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5896 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5897 }
5898
5899 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5900 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5901 }
5902
5903 // Free interfaces
5904 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5905 _local_interfaces, _transitive_interfaces);
5906
5907 if (_combined_annotations != nullptr) {
5908 // After all annotations arrays have been created, they are installed into the
5909 // Annotations object that will be assigned to the InstanceKlass being created.
5910
5911 // Deallocate the Annotations object and the installed annotations arrays.
5912 _combined_annotations->deallocate_contents(_loader_data);
5913
5914 // If the _combined_annotations pointer is non-null,
5915 // then the other annotations fields should have been cleared.
5916 assert(_class_annotations == nullptr, "Should have been cleared");
5917 assert(_class_type_annotations == nullptr, "Should have been cleared");
5918 assert(_fields_annotations == nullptr, "Should have been cleared");
5919 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5920 } else {
5921 // If the annotations arrays were not installed into the Annotations object,
5922 // then they have to be deallocated explicitly.
5982
5983 assert(cp_size == (u2)cp->length(), "invariant");
5984
5985 // ACCESS FLAGS
5986 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5987
5988 // Access flags
5989 u2 flags;
5990 // JVM_ACC_MODULE is defined in JDK-9 and later.
5991 if (_major_version >= JAVA_9_VERSION) {
5992 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5993 } else {
5994 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5995 }
5996
5997 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5998 // Set abstract bit for old class files for backward compatibility
5999 flags |= JVM_ACC_ABSTRACT;
6000 }
6001
6002 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
6003 if (!supports_inline_types()) {
6004 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6005 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6006 if (!is_module && !is_interface) {
6007 flags |= JVM_ACC_IDENTITY;
6008 }
6009 }
6010
6011 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
6012
6013 short bad_constant = class_bad_constant_seen();
6014 if (bad_constant != 0) {
6015 // Do not throw CFE until after the access_flags are checked because if
6016 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6017 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6018 return;
6019 }
6020
6021 _access_flags.set_flags(flags);
6022
6023 // This class and superclass
6024 _this_class_index = stream->get_u2_fast();
6025 guarantee_property(
6026 valid_cp_range(_this_class_index, cp_size) &&
6027 cp->tag_at(_this_class_index).is_unresolved_klass(),
6028 "Invalid this class index %u in constant pool in class file %s",
6029 _this_class_index, CHECK);
6030
6098
6099 // SUPERKLASS
6100 _super_class_index = stream->get_u2_fast();
6101 check_super_class(cp,
6102 _super_class_index,
6103 _need_verify,
6104 CHECK);
6105
6106 // Interfaces
6107 _itfs_len = stream->get_u2_fast();
6108 parse_interfaces(stream,
6109 _itfs_len,
6110 cp,
6111 &_has_nonstatic_concrete_methods,
6112 CHECK);
6113
6114 assert(_local_interfaces != nullptr, "invariant");
6115
6116 // Fields (offsets are filled in later)
6117 parse_fields(stream,
6118 _access_flags,
6119 cp,
6120 cp_size,
6121 &_java_fields_count,
6122 CHECK);
6123
6124 assert(_temp_field_info != nullptr, "invariant");
6125
6126 // Methods
6127 parse_methods(stream,
6128 _access_flags.is_interface(),
6129 &_has_localvariable_table,
6130 &_has_final_method,
6131 &_declares_nonstatic_concrete_methods,
6132 CHECK);
6133
6134 assert(_methods != nullptr, "invariant");
6135
6136 if (_declares_nonstatic_concrete_methods) {
6137 _has_nonstatic_concrete_methods = true;
6138 }
6218 // errors not checked yet.
6219 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6220 "Interfaces must have java.lang.Object as superclass in class file %s",
6221 CHECK);
6222 }
6223 Handle loader(THREAD, _loader_data->class_loader());
6224 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6225 // fast path to avoid lookup
6226 _super_klass = vmClasses::Object_klass();
6227 } else {
6228 _super_klass = (const InstanceKlass*)
6229 SystemDictionary::resolve_super_or_fail(_class_name,
6230 super_class_name,
6231 loader,
6232 true,
6233 CHECK);
6234 }
6235 }
6236
6237 if (_super_klass != nullptr) {
6238 if (_super_klass->is_interface()) {
6239 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6240 return;
6241 }
6242
6243 if (_super_klass->is_final()) {
6244 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6245 return;
6246 }
6247
6248 if (Arguments::is_valhalla_enabled()) {
6249 // If this class is a value class, its super class cannot be an identity class unless it is java.lang.Object.
6250 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() &&
6251 _super_klass != vmClasses::Object_klass()) {
6252 ResourceMark rm(THREAD);
6253 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6254 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string()));
6255 }
6256 }
6257
6258 if (_super_klass->has_nonstatic_concrete_methods()) {
6259 _has_nonstatic_concrete_methods = true;
6260 }
6261 }
6262
6263 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6264 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6265 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6266 _class_name->as_klass_external_name()));
6267 }
6268
6269 // Determining if the class allows tearing or not (default is not)
6270 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6271 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6272 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6273 // Conditions above are not sufficient to determine atomicity requirements.
6274 // Fields with atomicity requirements could force the current class to have atomicity requirements too.
6275 // Mark as not needing atomicity for now - can be updated when computing the fields layout.
6276 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6277 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6278 _must_be_atomic = false;
6279 }
6280 // Apply VM options override
6281 if (*ForceNonTearable != '\0') {
6282 // Allow a command line switch to force the same atomicity property:
6283 const char* class_name_str = _class_name->as_C_string();
6284 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6285 _must_be_atomic = true;
6286 }
6287 }
6288 }
6289
6290 // Compute the transitive list of all unique interfaces implemented by this class
6291 _transitive_interfaces =
6292 compute_transitive_interfaces(_super_klass,
6293 _local_interfaces,
6294 _loader_data,
6295 CHECK);
6296
6297 assert(_transitive_interfaces != nullptr, "invariant");
6298
6299 // sort methods
6300 _method_ordering = sort_methods(_methods);
6301
6302 _all_mirandas = new GrowableArray<Method*>(20);
6303
6304 Handle loader(THREAD, _loader_data->class_loader());
6305 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6306 &_num_miranda_methods,
6307 _all_mirandas,
6308 _super_klass,
6309 _methods,
6310 _access_flags,
6311 _major_version,
6312 loader,
6313 _class_name,
6314 _local_interfaces);
6315
6316 // Size of Java itable (in words)
6317 _itable_size = is_interface() ? 0 :
6318 klassItable::compute_itable_size(_transitive_interfaces);
6319
6320 assert(_parsed_annotations != nullptr, "invariant");
6321
6322 if (Arguments::is_valhalla_enabled()) {
6323 fetch_field_classes(cp, CHECK);
6324 }
6325
6326 _layout_info = new FieldLayoutInfo();
6327 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6328 _parsed_annotations->is_contended(), is_inline_type(),
6329 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6330 _must_be_atomic, _layout_info, _inline_layout_info_array);
6331 lb.build_layout();
6332
6333 // If it turned out that we didn't inline any of the fields, we deallocate
6334 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6335 // transferred to the allocated InstanceKlass.
6336 if (_inline_layout_info_array != nullptr && !(_layout_info->_has_inlined_fields || _has_null_restricted_static_fields)) {
6337 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6338 _inline_layout_info_array = nullptr;
6339 }
6340
6341 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6342 _fieldinfo_stream =
6343 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6344 injected_fields_count, loader_data(), CHECK);
6345 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6346 _fields_status =
6347 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6348 FieldStatus(0), CHECK);
6349
6350 // Strict static fields track initialization status from the beginning of time.
6351 // After this class runs <clinit>, they will be verified as being "not unset".
6352 // See Step 8 of InstanceKlass::initialize_impl.
6353 if (_has_strict_static_fields) {
6354 bool found_one = false;
6355 for (int i = 0; i < _temp_field_info->length(); i++) {
6356 FieldInfo& fi = *_temp_field_info->adr_at(i);
6357 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6358 found_one = true;
6359 if (fi.initializer_index() != 0) {
6360 // skip strict static fields with ConstantValue attributes
6361 } else {
6362 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6363 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6364 }
6365 }
6366 }
6367 assert(found_one == _has_strict_static_fields,
6368 "correct prediction = %d", (int)_has_strict_static_fields);
6369 }
6370 }
6371
6372 // In order to be able to optimize field layouts by applying heap flattening,
6373 // the JVM needs to know the layout of the class of the fields, which implies
6374 // having these classes loaded. The strategy has two folds:
6375 // 1 - if the current class has a LoadableDescriptors attribute containing the
6376 // name of the class of the field and PreloadClasses is true, the JVM will
6377 // try to speculatively load this class. Failures to load the class are
6378 // silently discarded, and loads resulting in a non-optimizable class
6379 // are ignored
6380 // 2 - if step 1 cannot be applied, the JVM will simply check if the class
6381 // loader of the current class already knows these classes (no class
6382 // loading triggered in this case). Note that the migrated value classes
6383 // of the JDK are automatically registered to all class loaders, and
6384 // are guaranteed to be found in this step even if the current class
6385 // has not been recompiled with JEP 401 features enabled
6386 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) {
6387 for (int i = 0; i < _temp_field_info->length(); i++) {
6388 FieldInfo& fieldinfo = _temp_field_info->at(i);
6389 if (fieldinfo.access_flags().is_static() && !fieldinfo.field_flags().is_null_free_inline_type()) continue;
6390 Symbol* sig = fieldinfo.signature(cp);
6391 if (Signature::has_envelope(sig)) {
6392 TempNewSymbol name = Signature::strip_envelope(sig);
6393 if (name == _class_name) {
6394 if (fieldinfo.field_flags().is_null_free_inline_type() && !is_inline_type()) {
6395 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6396 } else {
6397 // Dummy setting to trigger the allocation of the inline_layout_info array -
6398 // the real pointer will be set later in ::fill_instance_klass, once the InlineKlass has been allocated.
6399 set_inline_layout_info_klass(fieldinfo.index(), nullptr, CHECK);
6400 }
6401 continue;
6402 }
6403 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) {
6404 ResourceMark rm(THREAD);
6405 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6406 "Cause: field type in LoadableDescriptors attribute",
6407 name->as_C_string(), _class_name->as_C_string());
6408 oop loader = loader_data()->class_loader();
6409 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6410 Handle(THREAD, loader),
6411 false, THREAD);
6412
6413 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6414
6415 if (klass != nullptr) {
6416 if (klass->is_inline_klass()) {
6417 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6418 log_info(class, preload)("Preloading of class %s during loading of class %s "
6419 "(cause: field type in LoadableDescriptors attribute) succeeded",
6420 name->as_C_string(), _class_name->as_C_string());
6421 } else {
6422 // Non value classes are allowed by the current spec, but it could be an indication of an issue so let's log this
6423 log_info(class, preload)("Preloading of class %s during loading of class %s "
6424 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6425 name->as_C_string(), _class_name->as_C_string());
6426 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6427 log_warning(class, preload)("After preloading of class %s during loading of class %s "
6428 "field was annotated with @NullRestricted but loaded class is not a value class, "
6429 "the annotation is ignored",
6430 name->as_C_string(), _class_name->as_C_string());
6431 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6432 }
6433 }
6434 } else {
6435 log_info(class, preload)("Preloading of class %s during loading of class %s "
6436 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6437 name->as_C_string(), _class_name->as_C_string(),
6438 PENDING_EXCEPTION->klass()->name()->as_C_string());
6439 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6440 log_warning(class, preload)("After preloading of class %s during loading of class %s failed,"
6441 "field was annotated with @NullRestricted but class is unknown, "
6442 "the annotation is ignored",
6443 name->as_C_string(), _class_name->as_C_string());
6444 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6445 }
6446
6447 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6448 // impact loading of current class.
6449 CLEAR_PENDING_EXCEPTION;
6450 }
6451 } else {
6452 oop loader = loader_data()->class_loader();
6453 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6454 if (klass != nullptr && klass->is_inline_klass()) {
6455 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6456 ResourceMark rm(THREAD);
6457 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary"
6458 "(field type not in LoadableDescriptors attribute)",
6459 _class_name->as_C_string(), name->as_C_string());
6460 } else if (fieldinfo.field_flags().is_null_free_inline_type()) {
6461 ResourceMark rm(THREAD);
6462 if (klass == nullptr) {
6463 log_warning(class, preload)("During loading of class %s, class %s is unknown, "
6464 "but a field of this type was annotated with @NullRestricted, "
6465 "the annotation is ignored",
6466 _class_name->as_C_string(), name->as_C_string());
6467 } else {
6468 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary "
6469 "and is not a concrete value class, but a field of this type was annotated with "
6470 "@NullRestricted, the annotation is ignored",
6471 _class_name->as_C_string(), name->as_C_string());
6472 }
6473 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6474 }
6475 }
6476 }
6477 }
6478 }
6479
6480 void ClassFileParser::set_klass(InstanceKlass* klass) {
6481
6482 #ifdef ASSERT
6483 if (klass != nullptr) {
6484 assert(nullptr == _klass, "leaking?");
6485 }
6486 #endif
6487
6488 _klass = klass;
6489 }
6490
6491 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6492 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6493
6494 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6495 // never allocated for an InstanceKlass which has no need for this information.
6496 if (_inline_layout_info_array == nullptr) {
6497 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6498 java_fields_count(),
6499 CHECK);
6500 }
6501
6502 // Set the Klass for the field's index
6503 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6504 }
6505
6506 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6507
6508 #ifdef ASSERT
6509 if (klass != nullptr) {
6510 assert(nullptr == _klass_to_deallocate, "leaking?");
6511 }
6512 #endif
6513
6514 _klass_to_deallocate = klass;
6515 }
6516
6517 // Caller responsible for ResourceMark
6518 // clone stream with rewound position
6519 const ClassFileStream* ClassFileParser::clone_stream() const {
6520 assert(_stream != nullptr, "invariant");
6521
6522 return _stream->clone();
6523 }
6524
6525 ReferenceType ClassFileParser::super_reference_type() const {
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