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
4658 // be taken as a field signature. Allow "void" if void_ok.
4659 // Return a pointer to just past the signature.
4660 // Return null if no legal signature is found.
4661 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4662 bool void_ok,
4663 unsigned int length,
4664 TRAPS) const {
4665 unsigned int array_dim = 0;
4666 while (length > 0) {
4667 switch (signature[0]) {
4668 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4669 case JVM_SIGNATURE_BOOLEAN:
4670 case JVM_SIGNATURE_BYTE:
4671 case JVM_SIGNATURE_CHAR:
4672 case JVM_SIGNATURE_SHORT:
4673 case JVM_SIGNATURE_INT:
4674 case JVM_SIGNATURE_FLOAT:
4675 case JVM_SIGNATURE_LONG:
4676 case JVM_SIGNATURE_DOUBLE:
4677 return signature + 1;
4678 case JVM_SIGNATURE_CLASS: {
4679 if (_major_version < JAVA_1_5_VERSION) {
4680 signature++;
4681 length--;
4682 // Skip over the class name if one is there
4683 const char* const p = skip_over_field_name(signature, true, length);
4684 assert(p == nullptr || p > signature, "must parse one character at least");
4685 // The next character better be a semicolon
4686 if (p != nullptr && // Parse of field name succeeded.
4687 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4688 p[0] == JVM_SIGNATURE_ENDCLASS) {
4689 return p + 1;
4690 }
4691 }
4692 else {
4693 // Skip leading 'L' and ignore first appearance of ';'
4694 signature++;
4695 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4696 // Format check signature
4697 if (c != nullptr) {
4698 int newlen = pointer_delta_as_int(c, (char*) signature);
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 }
1528
1529 const BasicType type = cp->basic_type_for_signature_at(signature_index);
1530
1531 // Update number of static oop fields.
1532 if (is_static && is_reference_type(type)) {
1533 _static_oop_count++;
1534 }
1535
1536 FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1537 fi.set_index(n);
1538 if (fieldFlags.is_generic()) {
1539 fi.set_generic_signature_index(generic_signature_index);
1540 }
1541 parsed_annotations.apply_to(&fi);
1542 if (fi.field_flags().is_contended()) {
1543 _has_contended_fields = true;
1544 }
1545 if (access_flags.is_strict() && access_flags.is_static()) {
1546 _has_strict_static_fields = true;
1547 }
1548 _temp_field_info->append(fi);
1549 }
1550 assert(_temp_field_info->length() == length, "Must be");
1551
1552 if (num_injected != 0) {
1553 for (int n = 0; n < num_injected; n++) {
1554 // Check for duplicates
1555 if (injected[n].may_be_java) {
1556 const Symbol* const name = injected[n].name();
1557 const Symbol* const signature = injected[n].signature();
1558 bool duplicate = false;
1559 for (int i = 0; i < length; i++) {
1560 const FieldInfo* const f = _temp_field_info->adr_at(i);
1561 if (name == cp->symbol_at(f->name_index()) &&
1562 signature == cp->symbol_at(f->signature_index())) {
1563 // Symbol is desclared in Java so skip this one
1564 duplicate = true;
1565 break;
1566 }
1567 }
1568 if (duplicate) {
1569 // These will be removed from the field array at the end
1570 continue;
1571 }
1572 }
1573
1574 // Injected field
1575 FieldInfo::FieldFlags fflags(0);
1576 fflags.update_injected(true);
1577 AccessFlags aflags;
1578 FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1579 int idx = _temp_field_info->append(fi);
1580 _temp_field_info->adr_at(idx)->set_index(idx);
1581 }
1582 }
1583
1584 if (is_inline_type) {
1585 // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1586 // It should never be seen by user code, it is used when writing "null" to a nullable flat field
1587 // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1588 // alive.
1589 FieldInfo::FieldFlags fflags2(0);
1590 fflags2.update_injected(true);
1591 AccessFlags aflags2(JVM_ACC_STATIC);
1592 FieldInfo fi2(aflags2,
1593 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1594 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1595 0,
1596 fflags2);
1597 int idx2 = _temp_field_info->append(fi2);
1598 _temp_field_info->adr_at(idx2)->set_index(idx2);
1599 _static_oop_count++;
1600 }
1601 if (!access_flags().is_identity_class() && !access_flags().is_interface()
1602 && _class_name != vmSymbols::java_lang_Object()) {
1603 // Acmp map ".acmp_maps" required for abstract and concrete value classes
1604 FieldInfo::FieldFlags fflags2(0);
1605 fflags2.update_injected(true);
1606 fflags2.update_stable(true);
1607 AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1608 FieldInfo fi3(aflags2,
1609 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1610 (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1611 0,
1612 fflags2);
1613 int idx2 = _temp_field_info->append(fi3);
1614 _temp_field_info->adr_at(idx2)->set_index(idx2);
1615 _static_oop_count++;
1616 }
1617
1618 if (_need_verify && length > 1) {
1619 // Check duplicated fields
1620 ResourceMark rm(THREAD);
1621 // Set containing name-signature pairs
1622 NameSigHashtable* names_and_sigs = new NameSigHashtable();
1623 for (int i = 0; i < _temp_field_info->length(); i++) {
1624 NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1625 _temp_field_info->adr_at(i)->signature(_cp));
1626 // If no duplicates, add name/signature in hashtable names_and_sigs.
1627 if(!names_and_sigs->put(name_and_sig, 0)) {
1628 classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1629 name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1630 return;
1631 }
1632 }
1633 }
1634 }
1635
1636
1981 }
1982 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1983 if (_location != _in_field && _location != _in_class) {
1984 break; // only allow for fields and classes
1985 }
1986 if (!EnableContended || (RestrictContended && !privileged)) {
1987 break; // honor privileges
1988 }
1989 return _jdk_internal_vm_annotation_Contended;
1990 }
1991 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1992 if (_location != _in_method) break; // only allow for methods
1993 if (RestrictReservedStack && !privileged) break; // honor privileges
1994 return _jdk_internal_vm_annotation_ReservedStackAccess;
1995 }
1996 case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1997 if (_location != _in_class) break; // only allow for classes
1998 if (!privileged) break; // only allow in privileged code
1999 return _jdk_internal_ValueBased;
2000 }
2001 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
2002 if (_location != _in_class) break; // only allow for classes
2003 return _jdk_internal_LooselyConsistentValue;
2004 }
2005 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
2006 if (_location != _in_field) break; // only allow for fields
2007 return _jdk_internal_NullRestricted;
2008 }
2009 case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
2010 return _java_lang_Deprecated;
2011 }
2012 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
2013 if (_location != _in_class) break; // only allow for classes
2014 if (!privileged) break; // only allow in privileged code
2015 return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
2016 }
2017 case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
2018 if (_location != _in_method) break; // only allow for methods
2019 if (!privileged) break; // only allow in privileged code
2020 return _method_AOTRuntimeSetup;
2021 }
2022 default: {
2023 break;
2024 }
2025 }
2026 return AnnotationCollector::_unknown;
2027 }
2028
2269
2270 const u2 signature_index = cfs->get_u2_fast();
2271 guarantee_property(
2272 valid_symbol_at(signature_index),
2273 "Illegal constant pool index %u for method signature in class file %s",
2274 signature_index, CHECK_NULL);
2275 const Symbol* const signature = cp->symbol_at(signature_index);
2276
2277 if (name == vmSymbols::class_initializer_name()) {
2278 // We ignore the other access flags for a valid class initializer.
2279 // (JVM Spec 2nd ed., chapter 4.6)
2280 if (_major_version < 51) { // backward compatibility
2281 flags = JVM_ACC_STATIC;
2282 } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2283 flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2284 } else {
2285 classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2286 return nullptr;
2287 }
2288 } else {
2289 verify_legal_method_modifiers(flags, access_flags(), name, CHECK_NULL);
2290 }
2291
2292 if (name == vmSymbols::object_initializer_name() && is_interface) {
2293 classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2294 return nullptr;
2295 }
2296
2297 if (Arguments::is_valhalla_enabled()) {
2298 if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2299 && ((flags & JVM_ACC_STATIC) == 0 )
2300 && !_access_flags.is_identity_class()) {
2301 classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2302 return nullptr;
2303 }
2304 }
2305
2306 int args_size = -1; // only used when _need_verify is true
2307 if (_need_verify) {
2308 verify_legal_name_with_signature(name, signature, CHECK_NULL);
2309 args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2310 verify_legal_method_signature(name, signature, CHECK_NULL);
2311 if (args_size > MAX_ARGS_SIZE) {
2312 classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2313 return nullptr;
2314 }
2315 }
2316
2317 AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2318
2319 // Default values for code and exceptions attribute elements
2320 u2 max_stack = 0;
2321 u2 max_locals = 0;
2322 u4 code_length = 0;
2323 const u1* code_start = nullptr;
2324 u2 exception_table_length = 0;
2325 const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
3109 valid_klass_reference_at(outer_class_info_index),
3110 "outer_class_info_index %u has bad constant type in class file %s",
3111 outer_class_info_index, CHECK_0);
3112
3113 if (outer_class_info_index != 0) {
3114 const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3115 char* bytes = (char*)outer_class_name->bytes();
3116 guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3117 "Outer class is an array class in class file %s", CHECK_0);
3118 }
3119 // Inner class name
3120 const u2 inner_name_index = cfs->get_u2_fast();
3121 guarantee_property(
3122 inner_name_index == 0 || valid_symbol_at(inner_name_index),
3123 "inner_name_index %u has bad constant type in class file %s",
3124 inner_name_index, CHECK_0);
3125 if (_need_verify) {
3126 guarantee_property(inner_class_info_index != outer_class_info_index,
3127 "Class is both outer and inner class in class file %s", CHECK_0);
3128 }
3129
3130 // Access flags
3131 u2 flags;
3132 // JVM_ACC_MODULE is defined in JDK-9 and later.
3133 if (_major_version >= JAVA_9_VERSION) {
3134 flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3135 } else {
3136 flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3137 }
3138
3139 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3140 // Set abstract bit for old class files for backward compatibility
3141 flags |= JVM_ACC_ABSTRACT;
3142 }
3143
3144 if (!supports_inline_types()) {
3145 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3146 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3147 if (!is_module && !is_interface) {
3148 flags |= JVM_ACC_IDENTITY;
3149 }
3150 }
3151
3152 Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3153 verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3154 AccessFlags inner_access_flags(flags);
3155
3156 inner_classes->at_put(index++, inner_class_info_index);
3157 inner_classes->at_put(index++, outer_class_info_index);
3158 inner_classes->at_put(index++, inner_name_index);
3159 inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3160 }
3161
3162 // Check for circular and duplicate entries.
3163 bool has_circularity = false;
3164 if (_need_verify) {
3165 has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3166 if (has_circularity) {
3167 // If circularity check failed then ignore InnerClasses attribute.
3168 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3169 index = 0;
3170 if (parsed_enclosingmethod_attribute) {
3171 inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3237 if (length > 0) {
3238 int index = 0;
3239 cfs->guarantee_more(2 * length, CHECK_0);
3240 for (int n = 0; n < length; n++) {
3241 const u2 class_info_index = cfs->get_u2_fast();
3242 guarantee_property(
3243 valid_klass_reference_at(class_info_index),
3244 "Permitted subclass class_info_index %u has bad constant type in class file %s",
3245 class_info_index, CHECK_0);
3246 permitted_subclasses->at_put(index++, class_info_index);
3247 }
3248 assert(index == size, "wrong size");
3249 }
3250
3251 // Restore buffer's current position.
3252 cfs->set_current(current_mark);
3253
3254 return length;
3255 }
3256
3257 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3258 const u1* const loadable_descriptors_attribute_start,
3259 TRAPS) {
3260 const u1* const current_mark = cfs->current();
3261 u2 length = 0;
3262 if (loadable_descriptors_attribute_start != nullptr) {
3263 cfs->set_current(loadable_descriptors_attribute_start);
3264 cfs->guarantee_more(2, CHECK_0); // length
3265 length = cfs->get_u2_fast();
3266 }
3267 const int size = length;
3268 Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3269 _loadable_descriptors = loadable_descriptors;
3270 if (length > 0) {
3271 int index = 0;
3272 cfs->guarantee_more(2 * length, CHECK_0);
3273 for (int n = 0; n < length; n++) {
3274 const u2 descriptor_index = cfs->get_u2_fast();
3275 guarantee_property(
3276 valid_symbol_at(descriptor_index),
3277 "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3278 descriptor_index, CHECK_0);
3279 Symbol* descriptor = _cp->symbol_at(descriptor_index);
3280 bool valid = legal_field_signature(descriptor, CHECK_0);
3281 if(!valid) {
3282 ResourceMark rm(THREAD);
3283 Exceptions::fthrow(THREAD_AND_LOCATION,
3284 vmSymbols::java_lang_ClassFormatError(),
3285 "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3286 descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3287 return 0;
3288 }
3289 loadable_descriptors->at_put(index++, descriptor_index);
3290 }
3291 assert(index == size, "wrong size");
3292 }
3293
3294 // Restore buffer's current position.
3295 cfs->set_current(current_mark);
3296
3297 return length;
3298 }
3299
3300 // Record {
3301 // u2 attribute_name_index;
3302 // u4 attribute_length;
3303 // u2 components_count;
3304 // component_info components[components_count];
3305 // }
3306 // component_info {
3307 // u2 name_index;
3308 // u2 descriptor_index
3309 // u2 attributes_count;
3310 // attribute_info_attributes[attributes_count];
3311 // }
3312 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3313 const ConstantPool* cp,
3314 const u1* const record_attribute_start,
3315 TRAPS) {
3316 const u1* const current_mark = cfs->current();
3317 int components_count = 0;
3318 unsigned int calculate_attr_size = 0;
3319 if (record_attribute_start != nullptr) {
3530 cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3531 guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3532 "Bad length on BootstrapMethods in class file %s",
3533 CHECK);
3534 }
3535
3536 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3537 ConstantPool* cp,
3538 ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3539 TRAPS) {
3540 assert(cfs != nullptr, "invariant");
3541 assert(cp != nullptr, "invariant");
3542 assert(parsed_annotations != nullptr, "invariant");
3543
3544 // Set inner classes attribute to default sentinel
3545 _inner_classes = Universe::the_empty_short_array();
3546 // Set nest members attribute to default sentinel
3547 _nest_members = Universe::the_empty_short_array();
3548 // Set _permitted_subclasses attribute to default sentinel
3549 _permitted_subclasses = Universe::the_empty_short_array();
3550 // Set _loadable_descriptors attribute to default sentinel
3551 _loadable_descriptors = Universe::the_empty_short_array();
3552 cfs->guarantee_more(2, CHECK); // attributes_count
3553 u2 attributes_count = cfs->get_u2_fast();
3554 bool parsed_sourcefile_attribute = false;
3555 bool parsed_innerclasses_attribute = false;
3556 bool parsed_nest_members_attribute = false;
3557 bool parsed_permitted_subclasses_attribute = false;
3558 bool parsed_loadable_descriptors_attribute = false;
3559 bool parsed_nest_host_attribute = false;
3560 bool parsed_record_attribute = false;
3561 bool parsed_enclosingmethod_attribute = false;
3562 bool parsed_bootstrap_methods_attribute = false;
3563 const u1* runtime_visible_annotations = nullptr;
3564 int runtime_visible_annotations_length = 0;
3565 const u1* runtime_visible_type_annotations = nullptr;
3566 int runtime_visible_type_annotations_length = 0;
3567 bool runtime_invisible_type_annotations_exists = false;
3568 bool runtime_invisible_annotations_exists = false;
3569 bool parsed_source_debug_ext_annotations_exist = false;
3570 const u1* inner_classes_attribute_start = nullptr;
3571 u4 inner_classes_attribute_length = 0;
3572 u2 enclosing_method_class_index = 0;
3573 u2 enclosing_method_method_index = 0;
3574 const u1* nest_members_attribute_start = nullptr;
3575 u4 nest_members_attribute_length = 0;
3576 const u1* record_attribute_start = nullptr;
3577 u4 record_attribute_length = 0;
3578 const u1* permitted_subclasses_attribute_start = nullptr;
3579 u4 permitted_subclasses_attribute_length = 0;
3580 const u1* loadable_descriptors_attribute_start = nullptr;
3581 u4 loadable_descriptors_attribute_length = 0;
3582
3583 // Iterate over attributes
3584 while (attributes_count--) {
3585 cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length
3586 const u2 attribute_name_index = cfs->get_u2_fast();
3587 const u4 attribute_length = cfs->get_u4_fast();
3588 guarantee_property(
3589 valid_symbol_at(attribute_name_index),
3590 "Attribute name has bad constant pool index %u in class file %s",
3591 attribute_name_index, CHECK);
3592 const Symbol* const tag = cp->symbol_at(attribute_name_index);
3593 if (tag == vmSymbols::tag_source_file()) {
3594 // Check for SourceFile tag
3595 if (_need_verify) {
3596 guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3597 }
3598 if (parsed_sourcefile_attribute) {
3599 classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3600 return;
3601 } else {
3777 return;
3778 }
3779 parsed_record_attribute = true;
3780 record_attribute_start = cfs->current();
3781 record_attribute_length = attribute_length;
3782 } else if (_major_version >= JAVA_17_VERSION) {
3783 if (tag == vmSymbols::tag_permitted_subclasses()) {
3784 if (parsed_permitted_subclasses_attribute) {
3785 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3786 return;
3787 }
3788 // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3789 if (_access_flags.is_final()) {
3790 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3791 return;
3792 }
3793 parsed_permitted_subclasses_attribute = true;
3794 permitted_subclasses_attribute_start = cfs->current();
3795 permitted_subclasses_attribute_length = attribute_length;
3796 }
3797 if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3798 if (parsed_loadable_descriptors_attribute) {
3799 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3800 return;
3801 }
3802 parsed_loadable_descriptors_attribute = true;
3803 loadable_descriptors_attribute_start = cfs->current();
3804 loadable_descriptors_attribute_length = attribute_length;
3805 }
3806 }
3807 // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3808 cfs->skip_u1(attribute_length, CHECK);
3809 } else {
3810 // Unknown attribute
3811 cfs->skip_u1(attribute_length, CHECK);
3812 }
3813 } else {
3814 // Unknown attribute
3815 cfs->skip_u1(attribute_length, CHECK);
3816 }
3817 } else {
3818 // Unknown attribute
3819 cfs->skip_u1(attribute_length, CHECK);
3820 }
3821 }
3822 _class_annotations = allocate_annotations(runtime_visible_annotations,
3823 runtime_visible_annotations_length,
3824 CHECK);
3825 _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3862 CHECK);
3863 if (_need_verify) {
3864 guarantee_property(record_attribute_length == calculated_attr_length,
3865 "Record attribute has wrong length in class file %s",
3866 CHECK);
3867 }
3868 }
3869
3870 if (parsed_permitted_subclasses_attribute) {
3871 const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3872 cfs,
3873 permitted_subclasses_attribute_start,
3874 CHECK);
3875 if (_need_verify) {
3876 guarantee_property(
3877 permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3878 "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3879 }
3880 }
3881
3882 if (parsed_loadable_descriptors_attribute) {
3883 const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3884 cfs,
3885 loadable_descriptors_attribute_start,
3886 CHECK);
3887 if (_need_verify) {
3888 guarantee_property(
3889 loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3890 "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3891 }
3892 }
3893
3894 if (_max_bootstrap_specifier_index >= 0) {
3895 guarantee_property(parsed_bootstrap_methods_attribute,
3896 "Missing BootstrapMethods attribute in class file %s", CHECK);
3897 }
3898 }
3899
3900 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3901 assert(k != nullptr, "invariant");
3902
3903 if (_synthetic_flag)
3904 k->set_is_synthetic();
3905 if (_sourcefile_index != 0) {
3906 k->set_source_file_name_index(_sourcefile_index);
3907 }
3908 if (_generic_signature_index != 0) {
3909 k->set_generic_signature_index(_generic_signature_index);
3910 }
3911 if (_sde_buffer != nullptr) {
3912 k->set_source_debug_extension(_sde_buffer, _sde_length);
3913 }
3940 _class_type_annotations = nullptr;
3941 _fields_annotations = nullptr;
3942 _fields_type_annotations = nullptr;
3943 }
3944
3945 // Transfer ownership of metadata allocated to the InstanceKlass.
3946 void ClassFileParser::apply_parsed_class_metadata(
3947 InstanceKlass* this_klass,
3948 int java_fields_count) {
3949 assert(this_klass != nullptr, "invariant");
3950
3951 _cp->set_pool_holder(this_klass);
3952 this_klass->set_constants(_cp);
3953 this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3954 this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3955 this_klass->set_fields_status(_fields_status);
3956 this_klass->set_methods(_methods);
3957 this_klass->set_inner_classes(_inner_classes);
3958 this_klass->set_nest_members(_nest_members);
3959 this_klass->set_nest_host_index(_nest_host);
3960 this_klass->set_loadable_descriptors(_loadable_descriptors);
3961 this_klass->set_annotations(_combined_annotations);
3962 this_klass->set_permitted_subclasses(_permitted_subclasses);
3963 this_klass->set_record_components(_record_components);
3964 this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3965
3966 DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3967
3968 // Delay the setting of _local_interfaces and _transitive_interfaces until after
3969 // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3970 // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3971 // its _super. If an OOM occurs while loading the current klass, its _super field
3972 // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3973 // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3974 // dereferences to the deallocated _transitive_interfaces will result in a crash.
3975
3976 // Clear out these fields so they don't get deallocated by the destructor
3977 clear_class_metadata();
3978 }
3979
3980 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3981 int anno_length,
3982 TRAPS) {
3983 AnnotationArray* annotations = nullptr;
3984 if (anno != nullptr) {
3985 annotations = MetadataFactory::new_array<u1>(_loader_data,
3986 anno_length,
3987 CHECK_(annotations));
3988 for (int i = 0; i < anno_length; i++) {
3989 annotations->at_put(i, anno[i]);
3990 }
3991 }
3992 return annotations;
3993 }
3994
3995 void ClassFileParser::check_super_class(ConstantPool* const cp,
3996 const int super_class_index,
3997 const bool need_verify,
3998 TRAPS) {
3999 assert(cp != nullptr, "invariant");
4000
4001 if (super_class_index == 0) {
4002 guarantee_property(_class_name == vmSymbols::java_lang_Object(),
4003 "Invalid superclass index 0 in class file %s",
4004 CHECK);
4005 } else {
4006 guarantee_property(valid_klass_reference_at(super_class_index),
4007 "Invalid superclass index %u in class file %s",
4008 super_class_index,
4009 CHECK);
4010
4011 // The class name should be legal because it is checked when parsing constant pool.
4012 // However, make sure it is not an array type.
4013 if (need_verify) {
4014 guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
4015 "Bad superclass name in class file %s", CHECK);
4016 }
4017 }
4018 }
4019
4020 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4021 _max_nonstatic_oop_maps = max_blocks;
4022 _nonstatic_oop_map_count = 0;
4023 if (max_blocks == 0) {
4175 // See documentation of InstanceKlass::can_be_fastpath_allocated().
4176 assert(ik->size_helper() > 0, "layout_helper is initialized");
4177 if (ik->is_abstract() || ik->is_interface()
4178 || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4179 || ik->size_helper() >= FastAllocateSizeLimit) {
4180 // Forbid fast-path allocation.
4181 const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4182 ik->set_layout_helper(lh);
4183 }
4184
4185 // Propagate the AOT runtimeSetup method discovery
4186 if (_has_aot_runtime_setup_method) {
4187 ik->set_is_runtime_setup_required();
4188 if (log_is_enabled(Info, aot, init)) {
4189 ResourceMark rm;
4190 log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4191 }
4192 }
4193 }
4194
4195 bool ClassFileParser::supports_inline_types() const {
4196 // Inline types are only supported by class file version 71.65535 and later
4197 return _major_version > JAVA_27_VERSION ||
4198 (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4199 }
4200
4201 // utility methods for appending an array with check for duplicates
4202
4203 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4204 const Array<InstanceKlass*>* const ifs) {
4205 // iterate over new interfaces
4206 for (int i = 0; i < ifs->length(); i++) {
4207 InstanceKlass* const e = ifs->at(i);
4208 assert(e->is_klass() && e->is_interface(), "just checking");
4209 // add new interface
4210 result->append_if_missing(e);
4211 }
4212 }
4213
4214 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4215 Array<InstanceKlass*>* local_ifs,
4216 ClassLoaderData* loader_data,
4217 TRAPS) {
4218 assert(local_ifs != nullptr, "invariant");
4219 assert(loader_data != nullptr, "invariant");
4220
4247 } else {
4248 ResourceMark rm;
4249 GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4250
4251 // Copy down from superclass
4252 if (super != nullptr) {
4253 append_interfaces(result, super->transitive_interfaces());
4254 }
4255
4256 // Copy down from local interfaces' superinterfaces
4257 for (int i = 0; i < local_size; i++) {
4258 InstanceKlass* const l = local_ifs->at(i);
4259 append_interfaces(result, l->transitive_interfaces());
4260 }
4261 // Finally add local interfaces
4262 append_interfaces(result, local_ifs);
4263
4264 // length will be less than the max_transitive_size if duplicates were removed
4265 const int length = result->length();
4266 assert(length <= max_transitive_size, "just checking");
4267
4268 Array<InstanceKlass*>* const new_result =
4269 MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4270 for (int i = 0; i < length; i++) {
4271 InstanceKlass* const e = result->at(i);
4272 assert(e != nullptr, "just checking");
4273 new_result->at_put(i, e);
4274 }
4275 return new_result;
4276 }
4277 }
4278
4279 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4280 assert(this_klass != nullptr, "invariant");
4281 const InstanceKlass* const super = this_klass->super();
4282
4283 if (super != nullptr) {
4284 if (super->is_final()) {
4285 classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4286 return;
4287 }
4288
4289 if (super->is_sealed()) {
4290 stringStream ss;
4291 ResourceMark rm(THREAD);
4292 if (!super->has_as_permitted_subclass(this_klass, ss)) {
4293 classfile_icce_error(ss.as_string(), THREAD);
4294 return;
4295 }
4296 }
4297
4298 // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4299 // flag set. But, java.lang.Object must still be allowed to be a direct super class
4300 // for a value classes. So, it is treated as a special case for now.
4301 if (!this_klass->access_flags().is_identity_class() &&
4302 super->name() != vmSymbols::java_lang_Object() &&
4303 super->is_identity_class()) {
4304 classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4305 return;
4306 }
4307
4308 Reflection::VerifyClassAccessResults vca_result =
4309 Reflection::verify_class_access(this_klass, super, false);
4310 if (vca_result != Reflection::ACCESS_OK) {
4311 ResourceMark rm(THREAD);
4312 char* msg = Reflection::verify_class_access_msg(this_klass,
4313 super,
4314 vca_result);
4315
4316 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4317 if (msg == nullptr) {
4318 bool same_module = (this_klass->module() == super->module());
4319 Exceptions::fthrow(
4320 THREAD_AND_LOCATION,
4321 vmSymbols::java_lang_IllegalAccessError(),
4322 "class %s cannot access its %ssuperclass %s (%s%s%s)",
4323 this_klass->external_name(),
4324 super->is_abstract() ? "abstract " : "",
4325 super->external_name(),
4326 (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4327 (same_module) ? "" : "; ",
4480 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4481 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4482 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4483 assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4484 if (is_module) {
4485 ResourceMark rm(THREAD);
4486 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4487 Exceptions::fthrow(
4488 THREAD_AND_LOCATION,
4489 vmSymbols::java_lang_NoClassDefFoundError(),
4490 "%s is not a class because access_flag ACC_MODULE is set",
4491 _class_name->as_C_string());
4492 return;
4493 }
4494
4495 if (!_need_verify) { return; }
4496
4497 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
4498 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4499 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4500 const bool is_identity = (flags & JVM_ACC_IDENTITY) != 0;
4501 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4502 const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4503 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4504 const bool valid_value_class = is_identity || is_interface || (supports_inline_types() && (is_abstract || is_final));
4505
4506 if ((is_abstract && is_final) ||
4507 (is_interface && !is_abstract) ||
4508 (is_interface && major_gte_1_5 && (is_identity || is_enum)) || // ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4509 (!is_interface && major_gte_1_5 && is_annotation) ||
4510 (!valid_value_class)) {
4511 ResourceMark rm(THREAD);
4512 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4513 if (inner_name == nullptr && !is_anonymous_inner_class) {
4514 Exceptions::fthrow(
4515 THREAD_AND_LOCATION,
4516 vmSymbols::java_lang_ClassFormatError(),
4517 "Illegal class modifiers in class %s: 0x%X",
4518 _class_name->as_C_string(), flags
4519 );
4520 } else {
4521 if (is_anonymous_inner_class) {
4522 Exceptions::fthrow(
4523 THREAD_AND_LOCATION,
4524 vmSymbols::java_lang_ClassFormatError(),
4525 "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4526 _class_name->as_C_string(), flags
4527 );
4528 } else {
4529 Exceptions::fthrow(
4530 THREAD_AND_LOCATION,
4585 THREAD_AND_LOCATION,
4586 vmSymbols::java_lang_UnsupportedClassVersionError(),
4587 "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4588 "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4589 class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4590 return;
4591 }
4592
4593 if (!Arguments::enable_preview()) {
4594 classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4595 class_name, major, minor, THREAD);
4596 return;
4597 }
4598
4599 } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4600 classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4601 class_name, major, minor, THREAD);
4602 }
4603 }
4604
4605 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4606 AccessFlags class_access_flags,
4607 TRAPS) const {
4608 if (!_need_verify) { return; }
4609
4610 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4611 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4612 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4613 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4614 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4615 const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0;
4616 const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4617 const bool is_enum = (flags & JVM_ACC_ENUM) != 0;
4618 const bool is_strict = (flags & JVM_ACC_STRICT_INIT) != 0;
4619 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4620
4621 const bool is_interface = class_access_flags.is_interface();
4622 const bool is_identity_class = class_access_flags.is_identity_class();
4623
4624 bool is_illegal = false;
4625 const char* error_msg = "";
4626
4627 // There is some overlap in the checks that apply, for example interface fields
4628 // must be static, static fields can't be strict, and therefore interfaces can't
4629 // have strict fields. So we don't have to check every possible invalid combination
4630 // individually as long as all are covered. Once we have found an illegal combination
4631 // we can stop checking.
4632
4633 if (!is_illegal) {
4634 if (is_interface) {
4635 if (!is_public || !is_static || !is_final || is_private ||
4636 is_protected || is_volatile || is_transient ||
4637 (major_gte_1_5 && is_enum)) {
4638 is_illegal = true;
4639 error_msg = "interface fields must be public, static and final, and may be synthetic";
4640 }
4641 } else { // not interface
4642 if (has_illegal_visibility(flags)) {
4643 is_illegal = true;
4644 error_msg = "invalid visibility flags for class field";
4645 } else if (is_final && is_volatile) {
4646 is_illegal = true;
4647 error_msg = "fields cannot be final and volatile";
4648 } else if (supports_inline_types()) {
4649 if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4650 is_illegal = true;
4651 error_msg = "value class fields must be either non-static final and strict, or static";
4652 }
4653 }
4654 }
4655 }
4656
4657 if (is_illegal) {
4658 ResourceMark rm(THREAD);
4659 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4660 Exceptions::fthrow(
4661 THREAD_AND_LOCATION,
4662 vmSymbols::java_lang_ClassFormatError(),
4663 "Illegal field modifiers (%s) in class %s: 0x%X",
4664 error_msg, _class_name->as_C_string(), flags);
4665 return;
4666 }
4667 }
4668
4669 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4670 AccessFlags class_access_flags,
4671 const Symbol* name,
4672 TRAPS) const {
4673 if (!_need_verify) { return; }
4674
4675 const bool is_public = (flags & JVM_ACC_PUBLIC) != 0;
4676 const bool is_private = (flags & JVM_ACC_PRIVATE) != 0;
4677 const bool is_static = (flags & JVM_ACC_STATIC) != 0;
4678 const bool is_final = (flags & JVM_ACC_FINAL) != 0;
4679 const bool is_native = (flags & JVM_ACC_NATIVE) != 0;
4680 const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0;
4681 const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0;
4682 const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
4683 const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4684 const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4685 const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4686 const bool major_gte_8 = _major_version >= JAVA_8_VERSION;
4687 const bool major_gte_17 = _major_version >= JAVA_17_VERSION;
4688 const bool is_initializer = (name == vmSymbols::object_initializer_name());
4689 const bool is_interface = class_access_flags.is_interface();
4690 const bool is_identity_class = class_access_flags.is_identity_class();
4691
4692 bool is_illegal = false;
4693 const char* class_note = "";
4694
4695 if (is_interface) {
4696 if (major_gte_8) {
4697 // Class file version is JAVA_8_VERSION or later Methods of
4698 // interfaces may set any of the flags except ACC_PROTECTED,
4699 // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4700 // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4701 if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4702 (is_native || is_protected || is_final || is_synchronized) ||
4703 // If a specific method of a class or interface has its
4704 // ACC_ABSTRACT flag set, it must not have any of its
4705 // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4706 // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to
4707 // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4708 // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4709 (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4710 is_illegal = true;
4711 }
4712 } else if (major_gte_1_5) {
4713 // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4714 if (!is_public || is_private || is_protected || is_static || is_final ||
4715 is_synchronized || is_native || !is_abstract || is_strict) {
4716 is_illegal = true;
4717 }
4718 } else {
4719 // Class file version is pre-JAVA_1_5_VERSION
4720 if (!is_public || is_static || is_final || is_native || !is_abstract) {
4721 is_illegal = true;
4722 }
4723 }
4724 } else { // not interface
4725 if (has_illegal_visibility(flags)) {
4726 is_illegal = true;
4727 } else {
4728 if (is_initializer) {
4729 if (is_static || is_final || is_synchronized || is_native ||
4730 is_abstract || (major_gte_1_5 && is_bridge)) {
4731 is_illegal = true;
4732 }
4733 } else { // not initializer
4734 if (!is_identity_class && is_synchronized && !is_static) {
4735 is_illegal = true;
4736 class_note = " (not an identity class)";
4737 } else {
4738 if (is_abstract) {
4739 if ((is_final || is_native || is_private || is_static ||
4740 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4741 is_illegal = true;
4742 }
4743 }
4744 }
4745 }
4746 }
4747 }
4748
4749 if (is_illegal) {
4750 ResourceMark rm(THREAD);
4751 // Names are all known to be < 64k so we know this formatted message is not excessively large.
4752 Exceptions::fthrow(
4753 THREAD_AND_LOCATION,
4754 vmSymbols::java_lang_ClassFormatError(),
4755 "Method %s in class %s%s has illegal modifiers: 0x%X",
4756 name->as_C_string(), _class_name->as_C_string(), class_note, flags);
4757 return;
4758 }
4759 }
4760
4761 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4762 int length,
4763 TRAPS) const {
4764 assert(_need_verify, "only called when _need_verify is true");
4765 // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4766 if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4767 classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4768 }
4769 }
4770
4771 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4772 // In class names, '/' separates unqualified names. This is verified in this function also.
4773 // Method names also may not contain the characters '<' or '>', unless <init>
4774 // or <clinit>. Note that method names may not be <init> or <clinit> in this
4775 // method. Because these names have been checked as special cases before
4776 // calling this method in verify_legal_method_name.
4794 if (type == ClassFileParser::LegalClass) {
4795 if (p == name || p+1 >= name+length ||
4796 *(p+1) == JVM_SIGNATURE_SLASH) {
4797 return false;
4798 }
4799 } else {
4800 return false; // do not permit '/' unless it's class name
4801 }
4802 break;
4803 case JVM_SIGNATURE_SPECIAL:
4804 case JVM_SIGNATURE_ENDSPECIAL:
4805 // do not permit '<' or '>' in method names
4806 if (type == ClassFileParser::LegalMethod) {
4807 return false;
4808 }
4809 }
4810 }
4811 return true;
4812 }
4813
4814 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4815 if (_loadable_descriptors == nullptr) return false;
4816 for (int i = 0; i < _loadable_descriptors->length(); i++) {
4817 Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4818 if (class_name == klass) return true;
4819 }
4820 return false;
4821 }
4822
4823 // Take pointer to a UTF8 byte string (not NUL-terminated).
4824 // Skip over the longest part of the string that could
4825 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4826 // Return a pointer to just past the fieldname.
4827 // Return null if no fieldname at all was found, or in the case of slash_ok
4828 // being true, we saw consecutive slashes (meaning we were looking for a
4829 // qualified path but found something that was badly-formed).
4830 static const char* skip_over_field_name(const char* const name,
4831 bool slash_ok,
4832 unsigned int length) {
4833 const char* p;
4834 jboolean last_is_slash = false;
4835 jboolean not_first_ch = false;
4836
4837 for (p = name; p != name + length; not_first_ch = true) {
4838 const char* old_p = p;
4839 jchar ch = *p;
4840 if (ch < 128) {
4841 p++;
4842 // quick check for ascii
4904 // be taken as a field signature. Allow "void" if void_ok.
4905 // Return a pointer to just past the signature.
4906 // Return null if no legal signature is found.
4907 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4908 bool void_ok,
4909 unsigned int length,
4910 TRAPS) const {
4911 unsigned int array_dim = 0;
4912 while (length > 0) {
4913 switch (signature[0]) {
4914 case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4915 case JVM_SIGNATURE_BOOLEAN:
4916 case JVM_SIGNATURE_BYTE:
4917 case JVM_SIGNATURE_CHAR:
4918 case JVM_SIGNATURE_SHORT:
4919 case JVM_SIGNATURE_INT:
4920 case JVM_SIGNATURE_FLOAT:
4921 case JVM_SIGNATURE_LONG:
4922 case JVM_SIGNATURE_DOUBLE:
4923 return signature + 1;
4924 case JVM_SIGNATURE_CLASS:
4925 {
4926 if (_major_version < JAVA_1_5_VERSION) {
4927 signature++;
4928 length--;
4929 // Skip over the class name if one is there
4930 const char* const p = skip_over_field_name(signature, true, length);
4931 assert(p == nullptr || p > signature, "must parse one character at least");
4932 // The next character better be a semicolon
4933 if (p != nullptr && // Parse of field name succeeded.
4934 p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4935 p[0] == JVM_SIGNATURE_ENDCLASS) {
4936 return p + 1;
4937 }
4938 }
4939 else {
4940 // Skip leading 'L' and ignore first appearance of ';'
4941 signature++;
4942 const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4943 // Format check signature
4944 if (c != nullptr) {
4945 int newlen = pointer_delta_as_int(c, (char*) signature);
5070 } else {
5071 // 4881221: relax the constraints based on JSR202 spec
5072 legal = verify_unqualified_name(bytes, length, LegalMethod);
5073 }
5074 }
5075
5076 if (!legal) {
5077 ResourceMark rm(THREAD);
5078 assert(_class_name != nullptr, "invariant");
5079 // Names are all known to be < 64k so we know this formatted message is not excessively large.
5080 Exceptions::fthrow(
5081 THREAD_AND_LOCATION,
5082 vmSymbols::java_lang_ClassFormatError(),
5083 "Illegal method name \"%.*s\" in class %s", length, bytes,
5084 _class_name->as_C_string()
5085 );
5086 return;
5087 }
5088 }
5089
5090 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5091 const char* const bytes = (const char*)signature->bytes();
5092 const unsigned int length = signature->utf8_length();
5093 const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5094
5095 if (p == nullptr || (p - bytes) != (int)length) {
5096 return false;
5097 }
5098 return true;
5099 }
5100
5101 // Checks if signature is a legal field signature.
5102 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5103 const Symbol* signature,
5104 TRAPS) const {
5105 if (!_need_verify) { return; }
5106
5107 if (!legal_field_signature(signature, THREAD)) {
5108 CLEAR_PENDING_EXCEPTION; // throw this exception instead
5109 throwIllegalSignature("Field", name, signature, CHECK);
5110 }
5111 }
5112
5113 // Check that the signature is compatible with the method name. For example,
5114 // check that <init> has a void signature.
5115 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5116 const Symbol* signature,
5117 TRAPS) const {
5118 if (!_need_verify) {
5119 return;
5120 }
5121
5122 // Class initializers cannot have args for class format version >= 51.
5123 if (name == vmSymbols::class_initializer_name() &&
5124 signature != vmSymbols::void_method_signature() &&
5125 _major_version >= JAVA_7_VERSION) {
5126 throwIllegalSignature("Method", name, signature, THREAD);
5127 return;
5128 }
5165 length -= pointer_delta_as_int(nextp, p);
5166 p = nextp;
5167 nextp = skip_over_field_signature(p, false, length, CHECK_0);
5168 }
5169 // The first non-signature thing better be a ')'
5170 if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5171 length--;
5172 // Now we better just have a return value
5173 nextp = skip_over_field_signature(p, true, length, CHECK_0);
5174 if (nextp && ((int)length == (nextp - p))) {
5175 return args_size;
5176 }
5177 }
5178 }
5179 // Report error
5180 throwIllegalSignature("Method", name, signature, THREAD);
5181 return 0;
5182 }
5183
5184 int ClassFileParser::static_field_size() const {
5185 assert(_layout_info != nullptr, "invariant");
5186 return _layout_info->_static_field_size;
5187 }
5188
5189 int ClassFileParser::total_oop_map_count() const {
5190 assert(_layout_info != nullptr, "invariant");
5191 return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5192 }
5193
5194 jint ClassFileParser::layout_size() const {
5195 assert(_layout_info != nullptr, "invariant");
5196 return _layout_info->_instance_size;
5197 }
5198
5199 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5200 const Array<Method*>* methods) {
5201 assert(ik != nullptr, "invariant");
5202 assert(methods != nullptr, "invariant");
5203
5204 // Set up Method*::intrinsic_id as soon as we know the names of methods.
5205 // (We used to do this lazily, but now we query it in Rewriter,
5206 // which is eagerly done for every method, so we might as well do it now,
5207 // when everything is fresh in memory.)
5208 const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5209
5210 if (klass_id != vmSymbolID::NO_SID) {
5211 for (int j = 0; j < methods->length(); ++j) {
5212 Method* method = methods->at(j);
5213 method->init_intrinsic_id(klass_id);
5214
5215 if (CheckIntrinsics) {
5216 // Check if an intrinsic is defined for method 'method',
5291 }
5292 }
5293
5294 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5295 const ClassInstanceInfo& cl_inst_info,
5296 TRAPS) {
5297 if (_klass != nullptr) {
5298 return _klass;
5299 }
5300
5301 InstanceKlass* const ik =
5302 InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5303
5304 if (is_hidden()) {
5305 mangle_hidden_class_name(ik);
5306 }
5307
5308 fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5309
5310 assert(_klass == ik, "invariant");
5311 return ik;
5312 }
5313
5314 void ClassFileParser::create_acmp_maps(InstanceKlass* ik, TRAPS) {
5315 ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5316 // Current format of acmp maps:
5317 // All maps are stored contiguously in a single int array because it might
5318 // be too early to instantiate an Object array (to be investigated)
5319 // Format is:
5320 // [number_of_nonoop_entries][offset0][size0][offset1][size1]...[oop_offset0][oop_offset1]...
5321 // ^ ^
5322 // | |
5323 // --------------------- Pair of integer describing a segment of
5324 // contiguous non-oop fields
5325 // First element is the number of segment of contiguous non-oop fields
5326 // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5327 // the offset then the size.
5328 // After the last segment of contiguous non-oop fields, oop fields are described, one element
5329 // per oop field, containing the offset of the field.
5330 int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5331 int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5332 int acmp_map_size = nonoop_acmp_map_size + oop_acmp_map_size + 1;
5333
5334 typeArrayOop map = oopFactory::new_intArray(acmp_map_size, CHECK);
5335 typeArrayHandle map_h(THREAD, map);
5336 Array<int>* acmp_maps_array = MetadataFactory::new_array<int>(loader_data(), acmp_map_size, CHECK);
5337
5338 map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5339 acmp_maps_array->at_put(0, _layout_info->_nonoop_acmp_map->length());
5340 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5341 map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5342 map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5343
5344 // Also store acmp maps as metadata for regeneration when using dynamic archive or AOT training data.
5345 acmp_maps_array->at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i)._offset);
5346 acmp_maps_array->at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i)._size);
5347 }
5348 int oop_map_start = nonoop_acmp_map_size + 1;
5349 for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5350 map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5351 acmp_maps_array->at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5352 }
5353 assert(acmp_maps_array->length() == map_h->length(), "sanity");
5354 ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5355 ik->set_acmp_maps_array(acmp_maps_array);
5356 }
5357
5358 // See the declarations of _fast_acmp_offset and _fast_acmp_mask in InlineKlass::Members
5359 // for details about the fast path logic, and the meaning of these values.
5360 void ClassFileParser::set_fast_acmp_members(InlineKlass* vk) const {
5361 if (_layout_info->_oop_acmp_map->length() > 0) { // Oops are not allowed in the fast path
5362 return;
5363 }
5364
5365 int64_t mask = 0;
5366 #ifdef VM_LITTLE_ENDIAN
5367 // Compute the mask for a memory zone with offset "start" and of size "size", both in bytes,
5368 // assuming it won't overflow the long. In little endian, the byte with smallest address/smallest offset/closest from header
5369 // will be the least significant byte.
5370 // Value Memory layout
5371 // make_mask_piece(0, 1) = 0x0000 0000 0000 00ff => ff | 00 | 00 | 00 | 00 | 00 | 00 | 00
5372 // make_mask_piece(0, 1) = 0x0000 0000 0000 ffff => ff | ff | 00 | 00 | 00 | 00 | 00 | 00
5373 // make_mask_piece(1, 1) = 0x0000 0000 0000 ff00 => 00 | ff | 00 | 00 | 00 | 00 | 00 | 00
5374 // make_mask_piece(1, 3) = 0x0000 0000 ffff ff00 => 00 | ff | ff | ff | 00 | 00 | 00 | 00
5375 auto make_mask_piece = [](int start, int size) -> int64_t { return right_n_bits<int64_t>(size * BitsPerByte) << (start * BitsPerByte); };
5376 #else
5377 // Leaving the mask and offset to default values (that is just "return;") is a correct and easy way to implement this for other endianness, but it will
5378 // have a runtime cost in do_acmp, without the benefit. It is better, and probably easy with access to such an architecture, to adapt the logic above
5379 // for big-endian architectures, but filling the mask from the other end. I prefer not to do it blindly.
5380 Unimplemented()
5381 #endif
5382
5383 // We build the mask for a 64-bit load from the start of the payload. For each contiguous piece of memory
5384 // we build the mask containing 1's where it would be in the loaded long: it must be as
5385 // long as the memory that is being accessed, but the placement depends on the endianness.
5386 for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5387 int piece_start = _layout_info->_nonoop_acmp_map->at(i)._offset - _layout_info->_payload_offset;
5388 int piece_size = _layout_info->_nonoop_acmp_map->at(i)._size;
5389 int piece_end = piece_start + piece_size - 1;
5390 if (piece_end >= BytesPerLong) { // Too far! Can't fit in an 8-byte load, fast path will not be taken
5391 return;
5392 }
5393 int64_t mask_piece = make_mask_piece(piece_start, piece_size);
5394 mask |= mask_piece;
5395 }
5396
5397 // 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
5398 // load to a lower offset (toward the beginning of the object), and adjust the mask accordingly, even if it means reading (part of)
5399 // the header: the mask will filter that out.
5400 // Since an object cannot be less than 8 bytes, it's surely safe.
5401 if (mask == 0) {
5402 // Special case: empty object. There is nothing to compare, and no payload. We can just read from the start
5403 // 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
5404 // accept null argument. This case is endianness-agnostic.
5405 vk->set_fast_acmp_offset(0);
5406 vk->set_fast_acmp_mask(mask);
5407 } else {
5408 #ifdef VM_LITTLE_ENDIAN
5409 // In little endian, if the payload is not a full 64 bits, the mask will have leading 0s (most significant bytes are bytes with
5410 // higher addresses/higher offset/further from the header). We can shift the mask so that there aren't leading 0s anymore, and
5411 // decrease the offset by the same amount.
5412 // For instance, let's say _payload_offset is 16, and the mask is 0x0000 ffff ffff 00ff, we have 16 leading 0s (the bubble at offset 1 is fine:
5413 // it might be due to padding). Reading from the start of the payload might read 2 bytes after the end of the payload. To avoid that, we
5414 // are going to shift the payload by 16 bits, and remove 2 bytes from the offset we should load from. At the end, fast_acmp_offset will be 14
5415 // and the mask 0xffff ffff 00ff 0000. The lowest 16 0s introduced by the shift will filter out the 2 bytes we read from the header.
5416 int leading_zeroes = static_cast<int>(count_leading_zeros(mask));
5417 assert(leading_zeroes % BitsPerByte == 0, "we should mask full bytes");
5418 mask <<= leading_zeroes;
5419 assert(count_leading_zeros(mask) == 0, "fast acmp mask can be moved further!");
5420 int offset = _layout_info->_payload_offset - leading_zeroes / BitsPerByte;
5421 assert(offset >= 0, "fast acmp path shouldn't load before the object");
5422 vk->set_fast_acmp_offset(offset);
5423 vk->set_fast_acmp_mask(mask);
5424 #else
5425 // Big endian architectures probably need to look at count_trailing_zeros, and shift right until the last bit is 1.
5426 // The offset still needs to be decreased.
5427 Unimplemented()
5428 #endif
5429 }
5430 }
5431
5432 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5433 bool changed_by_loadhook,
5434 const ClassInstanceInfo& cl_inst_info,
5435 TRAPS) {
5436 assert(ik != nullptr, "invariant");
5437
5438 // Set name and CLD before adding to CLD
5439 ik->set_class_loader_data(_loader_data);
5440 ik->set_class_loader_type();
5441 ik->set_name(_class_name);
5442
5443 // Add all classes to our internal class loader list here,
5444 // including classes in the bootstrap (null) class loader.
5445 const bool publicize = !is_internal();
5446
5447 _loader_data->add_class(ik, publicize);
5448
5449 set_klass_to_deallocate(ik);
5450
5451 assert(_layout_info != nullptr, "invariant");
5452 assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5453 assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5454 "sanity");
5455
5456 assert(ik->is_instance_klass(), "sanity");
5457 assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5458
5459 // Fill in information already parsed
5460 ik->set_should_verify_class(_need_verify);
5461
5462 // Not yet: supers are done below to support the new subtype-checking fields
5463 ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5464 ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5465 ik->set_has_strict_static_fields(_has_strict_static_fields);
5466
5467 if (_layout_info->_is_naturally_atomic) {
5468 ik->set_is_naturally_atomic();
5469 }
5470
5471 if (_layout_info->_must_be_atomic) {
5472 ik->set_must_be_atomic();
5473 }
5474
5475 ik->set_static_oop_field_count(_static_oop_count);
5476
5477 // this transfers ownership of a lot of arrays from
5478 // the parser onto the InstanceKlass*
5479 apply_parsed_class_metadata(ik, _java_fields_count);
5480
5481 // can only set dynamic nest-host after static nest information is set
5482 if (cl_inst_info.dynamic_nest_host() != nullptr) {
5483 ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5484 }
5485
5486 // note that is not safe to use the fields in the parser from this point on
5487 assert(nullptr == _cp, "invariant");
5488 assert(nullptr == _fieldinfo_stream, "invariant");
5489 assert(nullptr == _fieldinfo_search_table, "invariant");
5490 assert(nullptr == _fields_status, "invariant");
5491 assert(nullptr == _methods, "invariant");
5492 assert(nullptr == _inner_classes, "invariant");
5493 assert(nullptr == _nest_members, "invariant");
5494 assert(nullptr == _loadable_descriptors, "invariant");
5495 assert(nullptr == _combined_annotations, "invariant");
5496 assert(nullptr == _record_components, "invariant");
5497 assert(nullptr == _permitted_subclasses, "invariant");
5498 assert(nullptr == _inline_layout_info_array, "invariant");
5499
5500 if (_has_localvariable_table) {
5501 ik->set_has_localvariable_table(true);
5502 }
5503
5504 if (_has_final_method) {
5505 ik->set_has_final_method();
5506 }
5507
5508 ik->copy_method_ordering(_method_ordering, CHECK);
5509 // The InstanceKlass::_methods_jmethod_ids cache
5510 // is managed on the assumption that the initial cache
5511 // size is equal to the number of methods in the class. If
5512 // that changes, then InstanceKlass::idnum_can_increment()
5513 // has to be changed accordingly.
5514 ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5515
5516 ik->set_this_class_index(_this_class_index);
5517
5518 if (_is_hidden) {
5555 if ((_num_miranda_methods > 0) ||
5556 // if this class introduced new miranda methods or
5557 (_super_klass != nullptr && _super_klass->has_miranda_methods())
5558 // super class exists and this class inherited miranda methods
5559 ) {
5560 ik->set_has_miranda_methods(); // then set a flag
5561 }
5562
5563 // Fill in information needed to compute superclasses.
5564 ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5565 ik->set_transitive_interfaces(_transitive_interfaces);
5566 ik->set_local_interfaces(_local_interfaces);
5567 _transitive_interfaces = nullptr;
5568 _local_interfaces = nullptr;
5569
5570 // Initialize itable offset tables
5571 klassItable::setup_itable_offset_table(ik);
5572
5573 // Compute transitive closure of interfaces this class implements
5574 // Do final class setup
5575 OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5576 if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5577 oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5578 }
5579
5580 if (_has_contended_fields || _parsed_annotations->is_contended() ||
5581 ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5582 ik->set_has_contended_annotations(true);
5583 }
5584
5585 // Fill in has_finalizer and layout_helper
5586 set_precomputed_flags(ik);
5587
5588 // check if this class can access its super class
5589 check_super_class_access(ik, CHECK);
5590
5591 // check if this class can access its superinterfaces
5592 check_super_interface_access(ik, CHECK);
5593
5594 // check if this class overrides any final method
5595 check_final_method_override(ik, CHECK);
5616
5617 assert(_all_mirandas != nullptr, "invariant");
5618
5619 // Generate any default methods - default methods are public interface methods
5620 // that have a default implementation. This is new with Java 8.
5621 if (_has_nonstatic_concrete_methods) {
5622 DefaultMethods::generate_default_methods(ik,
5623 _all_mirandas,
5624 CHECK);
5625 }
5626
5627 // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5628 if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5629 !module_entry->has_default_read_edges()) {
5630 if (!module_entry->set_has_default_read_edges()) {
5631 // We won a potential race
5632 JvmtiExport::add_default_read_edges(module_handle, THREAD);
5633 }
5634 }
5635
5636 if (is_inline_type()) {
5637 InlineKlass* vk = InlineKlass::cast(ik);
5638 vk->set_payload_alignment(_layout_info->_payload_alignment);
5639 vk->set_payload_offset(_layout_info->_payload_offset);
5640 vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5641 vk->set_null_free_non_atomic_size_in_bytes(_layout_info->_null_free_non_atomic_size_in_bytes);
5642 vk->set_null_free_non_atomic_alignment(_layout_info->_null_free_non_atomic_alignment);
5643 vk->set_null_free_atomic_size_in_bytes(_layout_info->_null_free_atomic_layout_size_in_bytes);
5644 vk->set_nullable_atomic_size_in_bytes(_layout_info->_nullable_atomic_layout_size_in_bytes);
5645 vk->set_nullable_non_atomic_size_in_bytes(_layout_info->_nullable_non_atomic_layout_size_in_bytes);
5646 vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5647 vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5648 if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5649
5650 if (UseAcmpFastPath) {
5651 set_fast_acmp_members(vk);
5652 }
5653
5654 vk->initialize_calling_convention(CHECK);
5655 }
5656
5657 if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5658 && _class_name != vmSymbols::java_lang_Object()) {
5659 // Both abstract and concrete value classes need a field map for acmp
5660 create_acmp_maps(ik, CHECK);
5661 }
5662
5663 ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5664
5665 if (!is_internal()) {
5666 ik->print_class_load_logging(_loader_data, module_entry, _stream);
5667 if (CDSConfig::is_dumping_archive()) {
5668 SystemDictionaryShared::check_code_source(ik, _stream);
5669 }
5670
5671 if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5672 ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5673 log_is_enabled(Info, class, preview)) {
5674 ResourceMark rm;
5675 log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5676 ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5677 }
5678
5679 if (log_is_enabled(Debug, class, resolve)) {
5680 ResourceMark rm;
5681 // print out the superclass.
5682 const char * from = ik->external_name();
5726 const ClassLoadInfo* cl_info,
5727 Publicity pub_level,
5728 TRAPS) :
5729 _stream(stream),
5730 _class_name(nullptr),
5731 _loader_data(loader_data),
5732 _is_hidden(cl_info->is_hidden()),
5733 _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5734 _orig_cp_size(0),
5735 _static_oop_count(0),
5736 _super_klass(),
5737 _cp(nullptr),
5738 _fieldinfo_stream(nullptr),
5739 _fieldinfo_search_table(nullptr),
5740 _fields_status(nullptr),
5741 _methods(nullptr),
5742 _inner_classes(nullptr),
5743 _nest_members(nullptr),
5744 _nest_host(0),
5745 _permitted_subclasses(nullptr),
5746 _loadable_descriptors(nullptr),
5747 _record_components(nullptr),
5748 _local_interfaces(nullptr),
5749 _transitive_interfaces(nullptr),
5750 _combined_annotations(nullptr),
5751 _class_annotations(nullptr),
5752 _class_type_annotations(nullptr),
5753 _fields_annotations(nullptr),
5754 _fields_type_annotations(nullptr),
5755 _klass(nullptr),
5756 _klass_to_deallocate(nullptr),
5757 _parsed_annotations(nullptr),
5758 _layout_info(nullptr),
5759 _inline_layout_info_array(nullptr),
5760 _temp_field_info(nullptr),
5761 _method_ordering(nullptr),
5762 _all_mirandas(nullptr),
5763 _vtable_size(0),
5764 _itable_size(0),
5765 _num_miranda_methods(0),
5766 _protection_domain(cl_info->protection_domain()),
5767 _access_flags(),
5768 _pub_level(pub_level),
5769 _bad_constant_seen(0),
5770 _synthetic_flag(false),
5771 _sde_length(false),
5772 _sde_buffer(nullptr),
5773 _sourcefile_index(0),
5774 _generic_signature_index(0),
5775 _major_version(0),
5776 _minor_version(0),
5777 _this_class_index(0),
5778 _super_class_index(0),
5779 _itfs_len(0),
5780 _java_fields_count(0),
5781 _need_verify(false),
5782 _has_nonstatic_concrete_methods(false),
5783 _declares_nonstatic_concrete_methods(false),
5784 _has_localvariable_table(false),
5785 _has_final_method(false),
5786 _has_contended_fields(false),
5787 _has_aot_runtime_setup_method(false),
5788 _has_strict_static_fields(false),
5789 _is_naturally_atomic(false),
5790 _must_be_atomic(true),
5791 _has_loosely_consistent_annotation(false),
5792 _has_finalizer(false),
5793 _has_empty_finalizer(false),
5794 _max_bootstrap_specifier_index(-1) {
5795
5796 _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5797 _class_name->increment_refcount();
5798
5799 assert(_loader_data != nullptr, "invariant");
5800 assert(stream != nullptr, "invariant");
5801 assert(_stream != nullptr, "invariant");
5802 assert(_stream->buffer() == _stream->current(), "invariant");
5803 assert(_class_name != nullptr, "invariant");
5804 assert(0 == _access_flags.as_unsigned_short(), "invariant");
5805
5806 // Figure out whether we can skip format checking (matching classic VM behavior)
5807 // Always verify CFLH bytes from the user agents.
5808 _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5809
5810 // synch back verification state to stream to check for truncation.
5811 stream->set_need_verify(_need_verify);
5812
5813 parse_stream(stream, CHECK);
5814
5815 post_process_parsed_stream(stream, _cp, CHECK);
5816 }
5817
5818 void ClassFileParser::clear_class_metadata() {
5819 // metadata created before the instance klass is created. Must be
5820 // deallocated if classfile parsing returns an error.
5821 _cp = nullptr;
5822 _fieldinfo_stream = nullptr;
5823 _fieldinfo_search_table = nullptr;
5824 _fields_status = nullptr;
5825 _methods = nullptr;
5826 _inner_classes = nullptr;
5827 _nest_members = nullptr;
5828 _permitted_subclasses = nullptr;
5829 _loadable_descriptors = nullptr;
5830 _combined_annotations = nullptr;
5831 _class_annotations = _class_type_annotations = nullptr;
5832 _fields_annotations = _fields_type_annotations = nullptr;
5833 _record_components = nullptr;
5834 _inline_layout_info_array = nullptr;
5835 }
5836
5837 // Destructor to clean up
5838 ClassFileParser::~ClassFileParser() {
5839 _class_name->decrement_refcount();
5840
5841 if (_cp != nullptr) {
5842 MetadataFactory::free_metadata(_loader_data, _cp);
5843 }
5844
5845 if (_fieldinfo_stream != nullptr) {
5846 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5847 }
5848 MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5849
5850 if (_fields_status != nullptr) {
5851 MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5852 }
5853
5854 if (_inline_layout_info_array != nullptr) {
5855 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5856 }
5857
5858 if (_methods != nullptr) {
5859 // Free methods
5860 InstanceKlass::deallocate_methods(_loader_data, _methods);
5861 }
5862
5863 // beware of the Universe::empty_blah_array!!
5864 if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5865 MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5866 }
5867
5868 if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5869 MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5870 }
5871
5872 if (_record_components != nullptr) {
5873 InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5874 }
5875
5876 if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5877 MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5878 }
5879
5880 if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5881 MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5882 }
5883
5884 // Free interfaces
5885 InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5886 _local_interfaces, _transitive_interfaces);
5887
5888 if (_combined_annotations != nullptr) {
5889 // After all annotations arrays have been created, they are installed into the
5890 // Annotations object that will be assigned to the InstanceKlass being created.
5891
5892 // Deallocate the Annotations object and the installed annotations arrays.
5893 _combined_annotations->deallocate_contents(_loader_data);
5894
5895 // If the _combined_annotations pointer is non-null,
5896 // then the other annotations fields should have been cleared.
5897 assert(_class_annotations == nullptr, "Should have been cleared");
5898 assert(_class_type_annotations == nullptr, "Should have been cleared");
5899 assert(_fields_annotations == nullptr, "Should have been cleared");
5900 assert(_fields_type_annotations == nullptr, "Should have been cleared");
5901 } else {
5902 // If the annotations arrays were not installed into the Annotations object,
5903 // then they have to be deallocated explicitly.
5963
5964 assert(cp_size == (u2)cp->length(), "invariant");
5965
5966 // ACCESS FLAGS
5967 stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len
5968
5969 // Access flags
5970 u2 flags;
5971 // JVM_ACC_MODULE is defined in JDK-9 and later.
5972 if (_major_version >= JAVA_9_VERSION) {
5973 flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5974 } else {
5975 flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5976 }
5977
5978 if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5979 // Set abstract bit for old class files for backward compatibility
5980 flags |= JVM_ACC_ABSTRACT;
5981 }
5982
5983 // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5984 if (!supports_inline_types()) {
5985 const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5986 const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5987 if (!is_module && !is_interface) {
5988 flags |= JVM_ACC_IDENTITY;
5989 }
5990 }
5991
5992 verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5993
5994 short bad_constant = class_bad_constant_seen();
5995 if (bad_constant != 0) {
5996 // Do not throw CFE until after the access_flags are checked because if
5997 // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5998 classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5999 return;
6000 }
6001
6002 _access_flags.set_flags(flags);
6003
6004 // This class and superclass
6005 _this_class_index = stream->get_u2_fast();
6006 guarantee_property(
6007 valid_cp_range(_this_class_index, cp_size) &&
6008 cp->tag_at(_this_class_index).is_unresolved_klass(),
6009 "Invalid this class index %u in constant pool in class file %s",
6010 _this_class_index, CHECK);
6011
6079
6080 // SUPERKLASS
6081 _super_class_index = stream->get_u2_fast();
6082 check_super_class(cp,
6083 _super_class_index,
6084 _need_verify,
6085 CHECK);
6086
6087 // Interfaces
6088 _itfs_len = stream->get_u2_fast();
6089 parse_interfaces(stream,
6090 _itfs_len,
6091 cp,
6092 &_has_nonstatic_concrete_methods,
6093 CHECK);
6094
6095 assert(_local_interfaces != nullptr, "invariant");
6096
6097 // Fields (offsets are filled in later)
6098 parse_fields(stream,
6099 _access_flags,
6100 cp,
6101 cp_size,
6102 &_java_fields_count,
6103 CHECK);
6104
6105 assert(_temp_field_info != nullptr, "invariant");
6106
6107 // Methods
6108 parse_methods(stream,
6109 _access_flags.is_interface(),
6110 &_has_localvariable_table,
6111 &_has_final_method,
6112 &_declares_nonstatic_concrete_methods,
6113 CHECK);
6114
6115 assert(_methods != nullptr, "invariant");
6116
6117 if (_declares_nonstatic_concrete_methods) {
6118 _has_nonstatic_concrete_methods = true;
6119 }
6199 // errors not checked yet.
6200 guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6201 "Interfaces must have java.lang.Object as superclass in class file %s",
6202 CHECK);
6203 }
6204 Handle loader(THREAD, _loader_data->class_loader());
6205 if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6206 // fast path to avoid lookup
6207 _super_klass = vmClasses::Object_klass();
6208 } else {
6209 _super_klass = (const InstanceKlass*)
6210 SystemDictionary::resolve_super_or_fail(_class_name,
6211 super_class_name,
6212 loader,
6213 true,
6214 CHECK);
6215 }
6216 }
6217
6218 if (_super_klass != nullptr) {
6219 if (_super_klass->is_interface()) {
6220 classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6221 return;
6222 }
6223
6224 if (_super_klass->is_final()) {
6225 classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6226 return;
6227 }
6228
6229 if (Arguments::is_valhalla_enabled()) {
6230 // If this class is an value class, its super class cannot be an identity class unless it is java.lang.Object.
6231 if (_super_klass->access_flags().is_identity_class() && !access_flags().is_identity_class() &&
6232 _super_klass != vmClasses::Object_klass()) {
6233 ResourceMark rm(THREAD);
6234 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6235 err_msg("Value type %s has an identity type as supertype", _class_name->as_C_string()));
6236 }
6237 }
6238
6239 if (_super_klass->has_nonstatic_concrete_methods()) {
6240 _has_nonstatic_concrete_methods = true;
6241 }
6242 }
6243
6244 if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6245 THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6246 err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6247 _class_name->as_klass_external_name()));
6248 }
6249
6250 // Determining if the class allows tearing or not (default is not)
6251 if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6252 if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6253 && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6254 // Conditions above are not sufficient to determine atomicity requirements,
6255 // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6256 // Marking as not needing atomicity for now, can be updated when computing the fields layout
6257 // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6258 // the FieldLayoutBuilder, not with this _must_be_atomic field.
6259 _must_be_atomic = false;
6260 }
6261 // Apply VM options override
6262 if (*ForceNonTearable != '\0') {
6263 // Allow a command line switch to force the same atomicity property:
6264 const char* class_name_str = _class_name->as_C_string();
6265 if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6266 _must_be_atomic = true;
6267 }
6268 }
6269 }
6270
6271 // Compute the transitive list of all unique interfaces implemented by this class
6272 _transitive_interfaces =
6273 compute_transitive_interfaces(_super_klass,
6274 _local_interfaces,
6275 _loader_data,
6276 CHECK);
6277
6278 assert(_transitive_interfaces != nullptr, "invariant");
6279
6280 // sort methods
6281 _method_ordering = sort_methods(_methods);
6282
6283 _all_mirandas = new GrowableArray<Method*>(20);
6284
6285 Handle loader(THREAD, _loader_data->class_loader());
6286 klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6287 &_num_miranda_methods,
6288 _all_mirandas,
6289 _super_klass,
6290 _methods,
6291 _access_flags,
6292 _major_version,
6293 loader,
6294 _class_name,
6295 _local_interfaces);
6296
6297 // Size of Java itable (in words)
6298 _itable_size = is_interface() ? 0 :
6299 klassItable::compute_itable_size(_transitive_interfaces);
6300
6301 assert(_parsed_annotations != nullptr, "invariant");
6302
6303 if (Arguments::is_valhalla_enabled()) {
6304 fetch_field_classes(cp, CHECK);
6305 }
6306
6307 _layout_info = new FieldLayoutInfo();
6308 FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6309 _parsed_annotations->is_contended(), is_inline_type(),
6310 access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6311 _must_be_atomic, _layout_info, _inline_layout_info_array);
6312 lb.build_layout();
6313
6314 // If it turned out that we didn't inline any of the fields, we deallocate
6315 // the array of InlineLayoutInfo since it isn't needed, and so it isn't
6316 // transferred to the allocated InstanceKlass.
6317 if (_inline_layout_info_array != nullptr && !_layout_info->_has_inlined_fields) {
6318 MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
6319 _inline_layout_info_array = nullptr;
6320 }
6321
6322 int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6323 _fieldinfo_stream =
6324 FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6325 injected_fields_count, loader_data(), CHECK);
6326 _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6327 _fields_status =
6328 MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6329 FieldStatus(0), CHECK);
6330
6331 // Strict static fields track initialization status from the beginning of time.
6332 // After this class runs <clinit>, they will be verified as being "not unset".
6333 // See Step 8 of InstanceKlass::initialize_impl.
6334 if (_has_strict_static_fields) {
6335 bool found_one = false;
6336 for (int i = 0; i < _temp_field_info->length(); i++) {
6337 FieldInfo& fi = *_temp_field_info->adr_at(i);
6338 if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6339 found_one = true;
6340 if (fi.initializer_index() != 0) {
6341 // skip strict static fields with ConstantValue attributes
6342 } else {
6343 _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6344 _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6345 }
6346 }
6347 }
6348 assert(found_one == _has_strict_static_fields,
6349 "correct prediction = %d", (int)_has_strict_static_fields);
6350 }
6351 }
6352
6353 // In order to be able to optimize fields layouts by applying heap flattening,
6354 // the JVM needs to know the layout of the class of the fields, which implies
6355 // having these classes loaded. The strategy has two folds:
6356 // 1 - if the current class has a LoadableDescriptors attribute containing the
6357 // name of the class of the field and PreloadClasses is true, the JVM will
6358 // try to speculatively load this class. Failures to load the class are
6359 // silently discarded, and loadings resulting in a non-optimizable class
6360 // are ignored
6361 // 2 - if step 1 cannot be applied, the JVM will simply check if the class
6362 // loader of the current class already knows these classes (no class
6363 // loading triggered in this case). Note that the migrated value classes
6364 // of the JDK are automatically registered to all class loaders, and
6365 // are guaranteed to be found in this step even if the current class
6366 // has not been recompiled with JEP 401 features enabled
6367 void ClassFileParser::fetch_field_classes(ConstantPool* cp, TRAPS) {
6368 for (int i = 0; i < _temp_field_info->length(); i++) {
6369 FieldInfo& fieldinfo = _temp_field_info->at(i);
6370 if (fieldinfo.access_flags().is_static()) continue; // Only non-static fields are processed at load time
6371 Symbol* sig = fieldinfo.signature(cp);
6372 if (Signature::has_envelope(sig)) {
6373 TempNewSymbol name = Signature::strip_envelope(sig);
6374 if (name == _class_name) continue;
6375 if (PreloadClasses && is_class_in_loadable_descriptors_attribute(sig)) {
6376 log_info(class, preload)("Preloading of class %s during loading of class %s. "
6377 "Cause: field type in LoadableDescriptors attribute",
6378 name->as_C_string(), _class_name->as_C_string());
6379 oop loader = loader_data()->class_loader();
6380 InstanceKlass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6381 Handle(THREAD, loader),
6382 false, THREAD);
6383
6384 assert((klass == nullptr) == HAS_PENDING_EXCEPTION, "Must be the same");
6385
6386 if (klass != nullptr) {
6387 if (klass->is_inline_klass()) {
6388 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6389 log_info(class, preload)("Preloading of class %s during loading of class %s "
6390 "(cause: field type in LoadableDescriptors attribute) succeeded",
6391 name->as_C_string(), _class_name->as_C_string());
6392 } else {
6393 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log this
6394 log_info(class, preload)("Preloading of class %s during loading of class %s "
6395 "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6396 name->as_C_string(), _class_name->as_C_string());
6397 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6398 log_warning(class, preload)("After preloading of class %s during loading of class %s "
6399 "field was annotated with @NullRestricted but loaded class is not a value class, "
6400 "the annotation is ignored",
6401 name->as_C_string(), _class_name->as_C_string());
6402 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6403 }
6404 }
6405 } else {
6406 log_info(class, preload)("Preloading of class %s during loading of class %s "
6407 "(cause: field type in LoadableDescriptors attribute) failed : %s",
6408 name->as_C_string(), _class_name->as_C_string(),
6409 PENDING_EXCEPTION->klass()->name()->as_C_string());
6410 if (fieldinfo.field_flags().is_null_free_inline_type()) {
6411 log_warning(class, preload)("After preloading of class %s during loading of class %s failed,"
6412 "field was annotated with @NullRestricted but class is unknown, "
6413 "the annotation is ignored",
6414 name->as_C_string(), _class_name->as_C_string());
6415 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6416 }
6417
6418 // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not
6419 // impact loading of current class.
6420 CLEAR_PENDING_EXCEPTION;
6421 }
6422 } else {
6423 oop loader = loader_data()->class_loader();
6424 InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6425 if (klass != nullptr && klass->is_inline_klass()) {
6426 set_inline_layout_info_klass(fieldinfo.index(), InlineKlass::cast(klass), CHECK);
6427 log_info(class, preload)("During loading of class %s , class %s found in local system dictionary"
6428 "(field type not in LoadableDescriptors attribute)",
6429 _class_name->as_C_string(), name->as_C_string());
6430 } else if (fieldinfo.field_flags().is_null_free_inline_type()) {
6431 if (klass == nullptr) {
6432 log_warning(class, preload)("During loading of class %s, class %s is unknown, "
6433 "but a field of this type was annotated with @NullRestricted, "
6434 "the annotation is ignored",
6435 _class_name->as_C_string(), name->as_C_string());
6436 } else {
6437 log_warning(class, preload)("During loading of class %s, class %s was found in the local system dictionary "
6438 "and is not a concrete value class, but a field of this type was annotated with "
6439 "@NullRestricted, the annotation is ignored",
6440 _class_name->as_C_string(), name->as_C_string());
6441 }
6442 fieldinfo.field_flags_addr()->update_null_free_inline_type(false);
6443 }
6444 }
6445 }
6446 }
6447 }
6448
6449 void ClassFileParser::set_klass(InstanceKlass* klass) {
6450
6451 #ifdef ASSERT
6452 if (klass != nullptr) {
6453 assert(nullptr == _klass, "leaking?");
6454 }
6455 #endif
6456
6457 _klass = klass;
6458 }
6459
6460 void ClassFileParser::set_inline_layout_info_klass(int field_index, InlineKlass* ik, TRAPS) {
6461 assert(field_index >= 0 && field_index < java_fields_count(), "IOOB: 0 <= %d < %d", field_index, (int)java_fields_count());
6462
6463 // The array of InlineLayoutInfo is allocated on demand. This way the array is
6464 // never allocated for an InstanceKlass which has no need for this information.
6465 if (_inline_layout_info_array == nullptr) {
6466 _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6467 java_fields_count(),
6468 CHECK);
6469 }
6470
6471 // Set the Klass for the field's index
6472 _inline_layout_info_array->adr_at(field_index)->set_klass(ik);
6473 }
6474
6475 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6476
6477 #ifdef ASSERT
6478 if (klass != nullptr) {
6479 assert(nullptr == _klass_to_deallocate, "leaking?");
6480 }
6481 #endif
6482
6483 _klass_to_deallocate = klass;
6484 }
6485
6486 // Caller responsible for ResourceMark
6487 // clone stream with rewound position
6488 const ClassFileStream* ClassFileParser::clone_stream() const {
6489 assert(_stream != nullptr, "invariant");
6490
6491 return _stream->clone();
6492 }
6493
6494 ReferenceType ClassFileParser::super_reference_type() const {
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