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src/hotspot/share/classfile/classFileParser.cpp

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   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */

  24 #include "precompiled.hpp"
  25 #include "classfile/classFileParser.hpp"
  26 #include "classfile/classFileStream.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/classLoaderData.inline.hpp"
  29 #include "classfile/classLoadInfo.hpp"
  30 #include "classfile/defaultMethods.hpp"
  31 #include "classfile/fieldLayoutBuilder.hpp"
  32 #include "classfile/javaClasses.inline.hpp"
  33 #include "classfile/moduleEntry.hpp"
  34 #include "classfile/packageEntry.hpp"
  35 #include "classfile/symbolTable.hpp"
  36 #include "classfile/systemDictionary.hpp"
  37 #include "classfile/verificationType.hpp"
  38 #include "classfile/verifier.hpp"
  39 #include "classfile/vmClasses.hpp"
  40 #include "classfile/vmSymbols.hpp"
  41 #include "jvm.h"
  42 #include "logging/log.hpp"
  43 #include "logging/logStream.hpp"
  44 #include "memory/allocation.hpp"
  45 #include "memory/metadataFactory.hpp"
  46 #include "memory/oopFactory.hpp"
  47 #include "memory/resourceArea.hpp"
  48 #include "memory/universe.hpp"
  49 #include "oops/annotations.hpp"
  50 #include "oops/constantPool.inline.hpp"
  51 #include "oops/fieldStreams.inline.hpp"

  52 #include "oops/instanceKlass.inline.hpp"
  53 #include "oops/instanceMirrorKlass.hpp"
  54 #include "oops/klass.inline.hpp"
  55 #include "oops/klassVtable.hpp"
  56 #include "oops/metadata.hpp"
  57 #include "oops/method.inline.hpp"
  58 #include "oops/oop.inline.hpp"
  59 #include "oops/recordComponent.hpp"
  60 #include "oops/symbol.hpp"
  61 #include "prims/jvmtiExport.hpp"
  62 #include "prims/jvmtiThreadState.hpp"
  63 #include "runtime/arguments.hpp"
  64 #include "runtime/fieldDescriptor.inline.hpp"
  65 #include "runtime/handles.inline.hpp"
  66 #include "runtime/javaCalls.hpp"
  67 #include "runtime/os.hpp"
  68 #include "runtime/perfData.hpp"
  69 #include "runtime/reflection.hpp"
  70 #include "runtime/safepointVerifiers.hpp"
  71 #include "runtime/signature.hpp"
  72 #include "runtime/timer.hpp"
  73 #include "services/classLoadingService.hpp"
  74 #include "services/threadService.hpp"
  75 #include "utilities/align.hpp"
  76 #include "utilities/bitMap.inline.hpp"
  77 #include "utilities/copy.hpp"
  78 #include "utilities/formatBuffer.hpp"
  79 #include "utilities/exceptions.hpp"
  80 #include "utilities/globalDefinitions.hpp"
  81 #include "utilities/growableArray.hpp"
  82 #include "utilities/macros.hpp"
  83 #include "utilities/ostream.hpp"
  84 #include "utilities/resourceHash.hpp"

  85 #include "utilities/utf8.hpp"
  86 #if INCLUDE_CDS
  87 #include "classfile/systemDictionaryShared.hpp"
  88 #endif
  89 #if INCLUDE_JFR
  90 #include "jfr/support/jfrTraceIdExtension.hpp"
  91 #endif
  92 
  93 // We generally try to create the oops directly when parsing, rather than
  94 // allocating temporary data structures and copying the bytes twice. A
  95 // temporary area is only needed when parsing utf8 entries in the constant
  96 // pool and when parsing line number tables.
  97 
  98 // We add assert in debug mode when class format is not checked.
  99 
 100 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
 101 #define JAVA_MIN_SUPPORTED_VERSION        45
 102 #define JAVA_PREVIEW_MINOR_VERSION        65535
 103 
 104 // Used for two backward compatibility reasons:

 127 #define JAVA_12_VERSION                   56
 128 
 129 #define JAVA_13_VERSION                   57
 130 
 131 #define JAVA_14_VERSION                   58
 132 
 133 #define JAVA_15_VERSION                   59
 134 
 135 #define JAVA_16_VERSION                   60
 136 
 137 #define JAVA_17_VERSION                   61
 138 
 139 #define JAVA_18_VERSION                   62
 140 
 141 #define JAVA_19_VERSION                   63
 142 
 143 #define JAVA_20_VERSION                   64
 144 
 145 #define JAVA_21_VERSION                   65
 146 


 147 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
 148   assert((bad_constant == JVM_CONSTANT_Module ||
 149           bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
 150          "Unexpected bad constant pool entry");
 151   if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
 152 }
 153 
 154 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 155                                                   ConstantPool* cp,
 156                                                   const int length,
 157                                                   TRAPS) {
 158   assert(stream != NULL, "invariant");
 159   assert(cp != NULL, "invariant");
 160 
 161   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 162   // this function (_current can be allocated in a register, with scalar
 163   // replacement of aggregates). The _current pointer is copied back to
 164   // stream() when this function returns. DON'T call another method within
 165   // this method that uses stream().
 166   const ClassFileStream cfs1 = *stream;
 167   const ClassFileStream* const cfs = &cfs1;
 168 
 169   debug_only(const u1* const old_current = stream->current();)
 170 
 171   // Used for batching symbol allocations.
 172   const char* names[SymbolTable::symbol_alloc_batch_size];
 173   int lengths[SymbolTable::symbol_alloc_batch_size];
 174   int indices[SymbolTable::symbol_alloc_batch_size];
 175   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 176   int names_count = 0;
 177 
 178   // parsing  Index 0 is unused
 179   for (int index = 1; index < length; index++) {
 180     // Each of the following case guarantees one more byte in the stream
 181     // for the following tag or the access_flags following constant pool,
 182     // so we don't need bounds-check for reading tag.
 183     const u1 tag = cfs->get_u1_fast();
 184     switch (tag) {
 185       case JVM_CONSTANT_Class : {
 186         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 187         const u2 name_index = cfs->get_u2_fast();
 188         cp->klass_index_at_put(index, name_index);
 189         break;
 190       }
 191       case JVM_CONSTANT_Fieldref: {
 192         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 193         const u2 class_index = cfs->get_u2_fast();
 194         const u2 name_and_type_index = cfs->get_u2_fast();
 195         cp->field_at_put(index, class_index, name_and_type_index);
 196         break;
 197       }
 198       case JVM_CONSTANT_Methodref: {
 199         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 200         const u2 class_index = cfs->get_u2_fast();
 201         const u2 name_and_type_index = cfs->get_u2_fast();
 202         cp->method_at_put(index, class_index, name_and_type_index);
 203         break;
 204       }
 205       case JVM_CONSTANT_InterfaceMethodref: {

 486         check_property(valid_symbol_at(name_ref_index),
 487           "Invalid constant pool index %u in class file %s",
 488           name_ref_index, CHECK);
 489         check_property(valid_symbol_at(signature_ref_index),
 490           "Invalid constant pool index %u in class file %s",
 491           signature_ref_index, CHECK);
 492         break;
 493       }
 494       case JVM_CONSTANT_Utf8:
 495         break;
 496       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 497       case JVM_CONSTANT_UnresolvedClassInError: {
 498         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 499         break;
 500       }
 501       case JVM_CONSTANT_ClassIndex: {
 502         const int class_index = cp->klass_index_at(index);
 503         check_property(valid_symbol_at(class_index),
 504           "Invalid constant pool index %u in class file %s",
 505           class_index, CHECK);
 506         cp->unresolved_klass_at_put(index, class_index, num_klasses++);







 507         break;
 508       }
 509       case JVM_CONSTANT_StringIndex: {
 510         const int string_index = cp->string_index_at(index);
 511         check_property(valid_symbol_at(string_index),
 512           "Invalid constant pool index %u in class file %s",
 513           string_index, CHECK);
 514         Symbol* const sym = cp->symbol_at(string_index);
 515         cp->unresolved_string_at_put(index, sym);
 516         break;
 517       }
 518       case JVM_CONSTANT_MethodHandle: {
 519         const int ref_index = cp->method_handle_index_at(index);
 520         check_property(valid_cp_range(ref_index, length),
 521           "Invalid constant pool index %u in class file %s",
 522           ref_index, CHECK);
 523         const constantTag tag = cp->tag_at(ref_index);
 524         const int ref_kind = cp->method_handle_ref_kind_at(index);
 525 
 526         switch (ref_kind) {

 686           cp->signature_ref_index_at(name_and_type_ref_index);
 687         const Symbol* const name = cp->symbol_at(name_ref_index);
 688         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 689         if (tag == JVM_CONSTANT_Fieldref) {
 690           if (_need_verify) {
 691             // Field name and signature are verified above, when iterating NameAndType_info.
 692             // Need only to be sure signature is non-zero length and the right type.
 693             if (Signature::is_method(signature)) {
 694               throwIllegalSignature("Field", name, signature, CHECK);
 695             }
 696           }
 697         } else {
 698           if (_need_verify) {
 699             // Method name and signature are individually verified above, when iterating
 700             // NameAndType_info.  Need to check here that signature is non-zero length and
 701             // the right type.
 702             if (!Signature::is_method(signature)) {
 703               throwIllegalSignature("Method", name, signature, CHECK);
 704             }
 705           }
 706           // If a class method name begins with '<', it must be "<init>" and have void signature.

 707           const unsigned int name_len = name->utf8_length();
 708           if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
 709               name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
 710             if (name != vmSymbols::object_initializer_name()) {

 711               classfile_parse_error(
 712                 "Bad method name at constant pool index %u in class file %s",
 713                 name_ref_index, THREAD);
 714               return;
 715             } else if (!Signature::is_void_method(signature)) { // must have void signature.
 716               throwIllegalSignature("Method", name, signature, CHECK);





 717             }
 718           }
 719         }
 720         break;
 721       }
 722       case JVM_CONSTANT_MethodHandle: {
 723         const int ref_index = cp->method_handle_index_at(index);
 724         const int ref_kind = cp->method_handle_ref_kind_at(index);
 725         switch (ref_kind) {
 726           case JVM_REF_invokeVirtual:
 727           case JVM_REF_invokeStatic:
 728           case JVM_REF_invokeSpecial:
 729           case JVM_REF_newInvokeSpecial: {
 730             const int name_and_type_ref_index =
 731               cp->name_and_type_ref_index_at(ref_index);
 732             const int name_ref_index =
 733               cp->name_ref_index_at(name_and_type_ref_index);
 734             const Symbol* const name = cp->symbol_at(name_ref_index);
 735             if (ref_kind == JVM_REF_newInvokeSpecial) {
 736               if (name != vmSymbols::object_initializer_name()) {











 737                 classfile_parse_error(
 738                   "Bad constructor name at constant pool index %u in class file %s",
 739                     name_ref_index, THREAD);
 740                 return;
 741               }
 742             } else {
 743               if (name == vmSymbols::object_initializer_name()) {








 744                 classfile_parse_error(
 745                   "Bad method name at constant pool index %u in class file %s",
 746                   name_ref_index, THREAD);
 747                 return;
 748               }
 749             }
 750             break;
 751           }
 752           // Other ref_kinds are already fully checked in previous pass.
 753         } // switch(ref_kind)
 754         break;
 755       }
 756       case JVM_CONSTANT_MethodType: {
 757         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 758         const Symbol* const signature = cp->method_type_signature_at(index);
 759         verify_legal_method_signature(no_name, signature, CHECK);
 760         break;
 761       }
 762       case JVM_CONSTANT_Utf8: {
 763         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");

 800   NameSigHash* entry = table[index];
 801   while (entry != NULL) {
 802     if (entry->_name == name && entry->_sig == sig) {
 803       return false;
 804     }
 805     entry = entry->_next;
 806   }
 807 
 808   // No duplicate is found, allocate a new entry and fill it.
 809   entry = new NameSigHash();
 810   entry->_name = name;
 811   entry->_sig = sig;
 812 
 813   // Insert into hash table
 814   entry->_next = table[index];
 815   table[index] = entry;
 816 
 817   return true;
 818 }
 819 
 820 // Side-effects: populates the _local_interfaces field
 821 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
 822                                        const int itfs_len,
 823                                        ConstantPool* const cp,



























 824                                        bool* const has_nonstatic_concrete_methods,







 825                                        TRAPS) {
 826   assert(stream != NULL, "invariant");
 827   assert(cp != NULL, "invariant");
 828   assert(has_nonstatic_concrete_methods != NULL, "invariant");
 829 
 830   if (itfs_len == 0) {
 831     _local_interfaces = Universe::the_empty_instance_klass_array();

 832   } else {
 833     assert(itfs_len > 0, "only called for len>0");
 834     _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
 835 
 836     int index;
 837     for (index = 0; index < itfs_len; index++) {
 838       const u2 interface_index = stream->get_u2(CHECK);
 839       Klass* interf;
 840       check_property(
 841         valid_klass_reference_at(interface_index),
 842         "Interface name has bad constant pool index %u in class file %s",
 843         interface_index, CHECK);
 844       if (cp->tag_at(interface_index).is_klass()) {
 845         interf = cp->resolved_klass_at(interface_index);
 846       } else {
 847         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
 848 
 849         // Don't need to check legal name because it's checked when parsing constant pool.
 850         // But need to make sure it's not an array type.
 851         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
 852                            "Bad interface name in class file %s", CHECK);
 853 
 854         // Call resolve_super so class circularity is checked
 855         interf = SystemDictionary::resolve_super_or_fail(
 856                                                   _class_name,
 857                                                   unresolved_klass,
 858                                                   Handle(THREAD, _loader_data->class_loader()),
 859                                                   _protection_domain,
 860                                                   false,
 861                                                   CHECK);
 862       }
 863 
 864       if (!interf->is_interface()) {
 865         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 866                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
 867                           _class_name->as_klass_external_name(),
 868                           interf->external_name(),
 869                           interf->class_in_module_of_loader()));
 870       }
 871 
 872       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
 873         *has_nonstatic_concrete_methods = true;
 874       }
 875       _local_interfaces->at_put(index, InstanceKlass::cast(interf));
 876     }
 877 
 878     if (!_need_verify || itfs_len <= 1) {
 879       return;
 880     }
 881 
 882     // Check if there's any duplicates in interfaces
 883     ResourceMark rm(THREAD);
 884     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
 885                                                                  NameSigHash*,
 886                                                                  HASH_ROW_SIZE);
 887     initialize_hashtable(interface_names);
 888     bool dup = false;
 889     const Symbol* name = NULL;
 890     {
 891       debug_only(NoSafepointVerifier nsv;)
 892       for (index = 0; index < itfs_len; index++) {
 893         const InstanceKlass* const k = _local_interfaces->at(index);
 894         name = k->name();
 895         // If no duplicates, add (name, NULL) in hashtable interface_names.
 896         if (!put_after_lookup(name, NULL, interface_names)) {
 897           dup = true;
 898           break;
 899         }
 900       }
 901     }
 902     if (dup) {
 903       classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
 904                              name->as_C_string(), THREAD);
 905     }
 906   }
 907 }
 908 
 909 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 910                                            int constantvalue_index,
 911                                            int signature_index,
 912                                            TRAPS) const {
 913   // Make sure the constant pool entry is of a type appropriate to this field
 914   guarantee_property(

1360                                             CHECK);
1361   parsed_annotations->set_field_annotations(a);
1362   a = assemble_annotations(runtime_visible_type_annotations,
1363                            runtime_visible_type_annotations_length,
1364                            runtime_invisible_type_annotations,
1365                            runtime_invisible_type_annotations_length,
1366                            CHECK);
1367   parsed_annotations->set_field_type_annotations(a);
1368   return;
1369 }
1370 
1371 
1372 // Field allocation types. Used for computing field offsets.
1373 
1374 enum FieldAllocationType {
1375   STATIC_OOP,           // Oops
1376   STATIC_BYTE,          // Boolean, Byte, char
1377   STATIC_SHORT,         // shorts
1378   STATIC_WORD,          // ints
1379   STATIC_DOUBLE,        // aligned long or double

1380   NONSTATIC_OOP,
1381   NONSTATIC_BYTE,
1382   NONSTATIC_SHORT,
1383   NONSTATIC_WORD,
1384   NONSTATIC_DOUBLE,

1385   MAX_FIELD_ALLOCATION_TYPE,
1386   BAD_ALLOCATION_TYPE = -1
1387 };
1388 
1389 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1390   BAD_ALLOCATION_TYPE, // 0
1391   BAD_ALLOCATION_TYPE, // 1
1392   BAD_ALLOCATION_TYPE, // 2
1393   BAD_ALLOCATION_TYPE, // 3
1394   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1395   NONSTATIC_SHORT,     // T_CHAR        =  5,
1396   NONSTATIC_WORD,      // T_FLOAT       =  6,
1397   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1398   NONSTATIC_BYTE,      // T_BYTE        =  8,
1399   NONSTATIC_SHORT,     // T_SHORT       =  9,
1400   NONSTATIC_WORD,      // T_INT         = 10,
1401   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1402   NONSTATIC_OOP,       // T_OBJECT      = 12,
1403   NONSTATIC_OOP,       // T_ARRAY       = 13,
1404   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1405   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1406   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1407   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1408   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1409   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,

1410   BAD_ALLOCATION_TYPE, // 0
1411   BAD_ALLOCATION_TYPE, // 1
1412   BAD_ALLOCATION_TYPE, // 2
1413   BAD_ALLOCATION_TYPE, // 3
1414   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1415   STATIC_SHORT,        // T_CHAR        =  5,
1416   STATIC_WORD,         // T_FLOAT       =  6,
1417   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1418   STATIC_BYTE,         // T_BYTE        =  8,
1419   STATIC_SHORT,        // T_SHORT       =  9,
1420   STATIC_WORD,         // T_INT         = 10,
1421   STATIC_DOUBLE,       // T_LONG        = 11,
1422   STATIC_OOP,          // T_OBJECT      = 12,
1423   STATIC_OOP,          // T_ARRAY       = 13,
1424   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1425   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1426   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1427   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1428   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1429   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,

1430 };
1431 
1432 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1433   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1434   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1435   assert(result != BAD_ALLOCATION_TYPE, "bad type");



1436   return result;
1437 }
1438 
1439 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1440  public:
1441   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1442 
1443   FieldAllocationCount() {
1444     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1445       count[i] = 0;
1446     }
1447   }
1448 
1449   void update(bool is_static, BasicType type) {
1450     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1451     if (atype != BAD_ALLOCATION_TYPE) {
1452       // Make sure there is no overflow with injected fields.
1453       assert(count[atype] < 0xFFFF, "More than 65535 fields");
1454       count[atype]++;
1455     }
1456   }
1457 };
1458 
1459 // Side-effects: populates the _fields, _fields_annotations,
1460 // _fields_type_annotations fields
1461 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1462                                    bool is_interface,
1463                                    FieldAllocationCount* const fac,
1464                                    ConstantPool* cp,
1465                                    const int cp_size,
1466                                    u2* const java_fields_count_ptr,
1467                                    TRAPS) {
1468 
1469   assert(cfs != NULL, "invariant");
1470   assert(fac != NULL, "invariant");
1471   assert(cp != NULL, "invariant");
1472   assert(java_fields_count_ptr != NULL, "invariant");
1473 
1474   assert(NULL == _fields, "invariant");
1475   assert(NULL == _fields_annotations, "invariant");
1476   assert(NULL == _fields_type_annotations, "invariant");
1477 

1478   cfs->guarantee_more(2, CHECK);  // length
1479   const u2 length = cfs->get_u2_fast();
1480   *java_fields_count_ptr = length;
1481 
1482   int num_injected = 0;
1483   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1484                                                                   &num_injected);
1485   const int total_fields = length + num_injected;




1486 
1487   // The field array starts with tuples of shorts
1488   // [access, name index, sig index, initial value index, byte offset].
1489   // A generic signature slot only exists for field with generic
1490   // signature attribute. And the access flag is set with
1491   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1492   // signature slots are at the end of the field array and after all
1493   // other fields data.
1494   //
1495   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1496   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1497   //       ...
1498   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1499   //       [generic signature index]
1500   //       [generic signature index]
1501   //       ...
1502   //
1503   // Allocate a temporary resource array for field data. For each field,
1504   // a slot is reserved in the temporary array for the generic signature
1505   // index. After parsing all fields, the data are copied to a permanent
1506   // array and any unused slots will be discarded.
1507   ResourceMark rm(THREAD);
1508   u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1509                                               u2,
1510                                               total_fields * (FieldInfo::field_slots + 1));
1511 
1512   // The generic signature slots start after all other fields' data.
1513   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1514   int num_generic_signature = 0;

1515   for (int n = 0; n < length; n++) {
1516     // access_flags, name_index, descriptor_index, attributes_count
1517     cfs->guarantee_more(8, CHECK);
1518 




1519     AccessFlags access_flags;
1520     const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1521     verify_legal_field_modifiers(flags, is_interface, CHECK);
1522     access_flags.set_flags(flags);
1523 
1524     const u2 name_index = cfs->get_u2_fast();
1525     check_property(valid_symbol_at(name_index),
1526       "Invalid constant pool index %u for field name in class file %s",
1527       name_index, CHECK);
1528     const Symbol* const name = cp->symbol_at(name_index);
1529     verify_legal_field_name(name, CHECK);
1530 
1531     const u2 signature_index = cfs->get_u2_fast();
1532     check_property(valid_symbol_at(signature_index),
1533       "Invalid constant pool index %u for field signature in class file %s",
1534       signature_index, CHECK);
1535     const Symbol* const sig = cp->symbol_at(signature_index);
1536     verify_legal_field_signature(name, sig, CHECK);

1537 
1538     u2 constantvalue_index = 0;
1539     bool is_synthetic = false;
1540     u2 generic_signature_index = 0;
1541     const bool is_static = access_flags.is_static();
1542     FieldAnnotationCollector parsed_annotations(_loader_data);
1543 
1544     const u2 attributes_count = cfs->get_u2_fast();
1545     if (attributes_count > 0) {
1546       parse_field_attributes(cfs,
1547                              attributes_count,
1548                              is_static,
1549                              signature_index,
1550                              &constantvalue_index,
1551                              &is_synthetic,
1552                              &generic_signature_index,
1553                              &parsed_annotations,
1554                              CHECK);
1555 
1556       if (parsed_annotations.field_annotations() != NULL) {

1576 
1577       if (is_synthetic) {
1578         access_flags.set_is_synthetic();
1579       }
1580       if (generic_signature_index != 0) {
1581         access_flags.set_field_has_generic_signature();
1582         fa[generic_signature_slot] = generic_signature_index;
1583         generic_signature_slot ++;
1584         num_generic_signature ++;
1585       }
1586     }
1587 
1588     FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1589     field->initialize(access_flags.as_short(),
1590                       name_index,
1591                       signature_index,
1592                       constantvalue_index);
1593     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1594 
1595     // Update FieldAllocationCount for this kind of field
1596     fac->update(is_static, type);
1597 
1598     // After field is initialized with type, we can augment it with aux info
1599     if (parsed_annotations.has_any_annotations()) {
1600       parsed_annotations.apply_to(field);
1601       if (field->is_contended()) {
1602         _has_contended_fields = true;
1603       }
1604     }
1605   }
1606 
1607   int index = length;
1608   if (num_injected != 0) {
1609     for (int n = 0; n < num_injected; n++) {
1610       // Check for duplicates
1611       if (injected[n].may_be_java) {
1612         const Symbol* const name      = injected[n].name();
1613         const Symbol* const signature = injected[n].signature();
1614         bool duplicate = false;
1615         for (int i = 0; i < length; i++) {
1616           const FieldInfo* const f = FieldInfo::from_field_array(fa, i);

1620             duplicate = true;
1621             break;
1622           }
1623         }
1624         if (duplicate) {
1625           // These will be removed from the field array at the end
1626           continue;
1627         }
1628       }
1629 
1630       // Injected field
1631       FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1632       field->initialize((u2)JVM_ACC_FIELD_INTERNAL,
1633                         (u2)(injected[n].name_index),
1634                         (u2)(injected[n].signature_index),
1635                         0);
1636 
1637       const BasicType type = Signature::basic_type(injected[n].signature());
1638 
1639       // Update FieldAllocationCount for this kind of field
1640       fac->update(false, type);
1641       index++;
1642     }
1643   }
1644 



























1645   assert(NULL == _fields, "invariant");
1646 
1647   _fields =
1648     MetadataFactory::new_array<u2>(_loader_data,
1649                                    index * FieldInfo::field_slots + num_generic_signature,
1650                                    CHECK);
1651   // Sometimes injected fields already exist in the Java source so
1652   // the fields array could be too long.  In that case the
1653   // fields array is trimmed. Also unused slots that were reserved
1654   // for generic signature indexes are discarded.
1655   {
1656     int i = 0;
1657     for (; i < index * FieldInfo::field_slots; i++) {
1658       _fields->at_put(i, fa[i]);
1659     }
1660     for (int j = total_fields * FieldInfo::field_slots;
1661          j < generic_signature_slot; j++) {
1662       _fields->at_put(i++, fa[j]);
1663     }
1664     assert(_fields->length() == i, "");

1942         "Exception name has bad type at constant pool %u in class file %s",
1943         checked_exception, CHECK_NULL);
1944     }
1945   }
1946   // check exceptions attribute length
1947   if (_need_verify) {
1948     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1949                                                    sizeof(u2) * size),
1950                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1951   }
1952   return checked_exceptions_start;
1953 }
1954 
1955 void ClassFileParser::throwIllegalSignature(const char* type,
1956                                             const Symbol* name,
1957                                             const Symbol* sig,
1958                                             TRAPS) const {
1959   assert(name != NULL, "invariant");
1960   assert(sig != NULL, "invariant");
1961 





1962   ResourceMark rm(THREAD);
1963   Exceptions::fthrow(THREAD_AND_LOCATION,
1964       vmSymbols::java_lang_ClassFormatError(),
1965       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1966       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1967 }
1968 
1969 AnnotationCollector::ID
1970 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1971                                       const Symbol* name,
1972                                       const bool can_access_vm_annotations) {
1973   const vmSymbolID sid = vmSymbols::find_sid(name);
1974   // Privileged code can use all annotations.  Other code silently drops some.
1975   const bool privileged = loader_data->is_boot_class_loader_data() ||
1976                           loader_data->is_platform_class_loader_data() ||
1977                           can_access_vm_annotations;
1978   switch (sid) {
1979     case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1980       if (_location != _in_method)  break;  // only allow for methods
1981       if (!privileged)              break;  // only allow in privileged code
1982       return _method_CallerSensitive;
1983     }
1984     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1985       if (_location != _in_method)  break;  // only allow for methods
1986       if (!privileged)              break;  // only allow in privileged code

2249                              runtime_visible_type_annotations_length,
2250                              runtime_invisible_type_annotations,
2251                              runtime_invisible_type_annotations_length,
2252                              CHECK);
2253     cm->set_type_annotations(a);
2254   }
2255 }
2256 
2257 
2258 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2259 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2260 // Method* to save footprint, so we only know the size of the resulting Method* when the
2261 // entire method attribute is parsed.
2262 //
2263 // The promoted_flags parameter is used to pass relevant access_flags
2264 // from the method back up to the containing klass. These flag values
2265 // are added to klass's access_flags.
2266 
2267 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2268                                       bool is_interface,


2269                                       const ConstantPool* cp,
2270                                       AccessFlags* const promoted_flags,
2271                                       TRAPS) {
2272   assert(cfs != NULL, "invariant");
2273   assert(cp != NULL, "invariant");
2274   assert(promoted_flags != NULL, "invariant");
2275 
2276   ResourceMark rm(THREAD);
2277   // Parse fixed parts:
2278   // access_flags, name_index, descriptor_index, attributes_count
2279   cfs->guarantee_more(8, CHECK_NULL);
2280 
2281   int flags = cfs->get_u2_fast();
2282   const u2 name_index = cfs->get_u2_fast();
2283   const int cp_size = cp->length();
2284   check_property(
2285     valid_symbol_at(name_index),
2286     "Illegal constant pool index %u for method name in class file %s",
2287     name_index, CHECK_NULL);
2288   const Symbol* const name = cp->symbol_at(name_index);

2290 
2291   const u2 signature_index = cfs->get_u2_fast();
2292   guarantee_property(
2293     valid_symbol_at(signature_index),
2294     "Illegal constant pool index %u for method signature in class file %s",
2295     signature_index, CHECK_NULL);
2296   const Symbol* const signature = cp->symbol_at(signature_index);
2297 
2298   if (name == vmSymbols::class_initializer_name()) {
2299     // We ignore the other access flags for a valid class initializer.
2300     // (JVM Spec 2nd ed., chapter 4.6)
2301     if (_major_version < 51) { // backward compatibility
2302       flags = JVM_ACC_STATIC;
2303     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2304       flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2305     } else {
2306       classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2307       return NULL;
2308     }
2309   } else {
2310     verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);

































2311   }
2312 
2313   if (name == vmSymbols::object_initializer_name() && is_interface) {
2314     classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2315     return NULL;





















2316   }
2317 
2318   int args_size = -1;  // only used when _need_verify is true
2319   if (_need_verify) {
2320     verify_legal_name_with_signature(name, signature, CHECK_NULL);
2321     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2322                  verify_legal_method_signature(name, signature, CHECK_NULL);
2323     if (args_size > MAX_ARGS_SIZE) {
2324       classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2325       return NULL;
2326     }
2327   }
2328 
2329   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2330 
2331   // Default values for code and exceptions attribute elements
2332   u2 max_stack = 0;
2333   u2 max_locals = 0;
2334   u4 code_length = 0;
2335   const u1* code_start = 0;

2865       _has_finalizer = true;
2866     }
2867   }
2868   if (name == vmSymbols::object_initializer_name() &&
2869       signature == vmSymbols::void_method_signature() &&
2870       m->is_vanilla_constructor()) {
2871     _has_vanilla_constructor = true;
2872   }
2873 
2874   NOT_PRODUCT(m->verify());
2875   return m;
2876 }
2877 
2878 
2879 // The promoted_flags parameter is used to pass relevant access_flags
2880 // from the methods back up to the containing klass. These flag values
2881 // are added to klass's access_flags.
2882 // Side-effects: populates the _methods field in the parser
2883 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2884                                     bool is_interface,


2885                                     AccessFlags* promoted_flags,
2886                                     bool* has_final_method,
2887                                     bool* declares_nonstatic_concrete_methods,
2888                                     TRAPS) {
2889   assert(cfs != NULL, "invariant");
2890   assert(promoted_flags != NULL, "invariant");
2891   assert(has_final_method != NULL, "invariant");
2892   assert(declares_nonstatic_concrete_methods != NULL, "invariant");
2893 
2894   assert(NULL == _methods, "invariant");
2895 
2896   cfs->guarantee_more(2, CHECK);  // length
2897   const u2 length = cfs->get_u2_fast();
2898   if (length == 0) {
2899     _methods = Universe::the_empty_method_array();
2900   } else {
2901     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2902                                                    length,
2903                                                    NULL,
2904                                                    CHECK);
2905 
2906     for (int index = 0; index < length; index++) {
2907       Method* method = parse_method(cfs,
2908                                     is_interface,


2909                                     _cp,
2910                                     promoted_flags,
2911                                     CHECK);
2912 
2913       if (method->is_final()) {
2914         *has_final_method = true;
2915       }
2916       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2917       // used for interface initialization, and default method inheritance analysis
2918       if (is_interface && !(*declares_nonstatic_concrete_methods)
2919         && !method->is_abstract() && !method->is_static()) {
2920         *declares_nonstatic_concrete_methods = true;
2921       }
2922       _methods->at_put(index, method);
2923     }
2924 
2925     if (_need_verify && length > 1) {
2926       // Check duplicated methods
2927       ResourceMark rm(THREAD);
2928       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(

3165         valid_klass_reference_at(outer_class_info_index),
3166       "outer_class_info_index %u has bad constant type in class file %s",
3167       outer_class_info_index, CHECK_0);
3168 
3169     if (outer_class_info_index != 0) {
3170       const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3171       char* bytes = (char*)outer_class_name->bytes();
3172       guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3173                          "Outer class is an array class in class file %s", CHECK_0);
3174     }
3175     // Inner class name
3176     const u2 inner_name_index = cfs->get_u2_fast();
3177     check_property(
3178       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3179       "inner_name_index %u has bad constant type in class file %s",
3180       inner_name_index, CHECK_0);
3181     if (_need_verify) {
3182       guarantee_property(inner_class_info_index != outer_class_info_index,
3183                          "Class is both outer and inner class in class file %s", CHECK_0);
3184     }
3185     // Access flags
3186     jint flags;
3187     // JVM_ACC_MODULE is defined in JDK-9 and later.
3188     if (_major_version >= JAVA_9_VERSION) {
3189       flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3190     } else {
3191       flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3192     }







3193     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3194       // Set abstract bit for old class files for backward compatibility
3195       flags |= JVM_ACC_ABSTRACT;
3196     }
3197     verify_legal_class_modifiers(flags, CHECK_0);












3198     AccessFlags inner_access_flags(flags);
3199 
3200     inner_classes->at_put(index++, inner_class_info_index);
3201     inner_classes->at_put(index++, outer_class_info_index);
3202     inner_classes->at_put(index++, inner_name_index);
3203     inner_classes->at_put(index++, inner_access_flags.as_short());
3204   }
3205 
3206   // Check for circular and duplicate entries.
3207   bool has_circularity = false;
3208   if (_need_verify) {
3209     has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3210     if (has_circularity) {
3211       // If circularity check failed then ignore InnerClasses attribute.
3212       MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3213       index = 0;
3214       if (parsed_enclosingmethod_attribute) {
3215         inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3216         _inner_classes = inner_classes;
3217       } else {

3281   if (length > 0) {
3282     int index = 0;
3283     cfs->guarantee_more(2 * length, CHECK_0);
3284     for (int n = 0; n < length; n++) {
3285       const u2 class_info_index = cfs->get_u2_fast();
3286       check_property(
3287         valid_klass_reference_at(class_info_index),
3288         "Permitted subclass class_info_index %u has bad constant type in class file %s",
3289         class_info_index, CHECK_0);
3290       permitted_subclasses->at_put(index++, class_info_index);
3291     }
3292     assert(index == size, "wrong size");
3293   }
3294 
3295   // Restore buffer's current position.
3296   cfs->set_current(current_mark);
3297 
3298   return length;
3299 }
3300 

































3301 //  Record {
3302 //    u2 attribute_name_index;
3303 //    u4 attribute_length;
3304 //    u2 components_count;
3305 //    component_info components[components_count];
3306 //  }
3307 //  component_info {
3308 //    u2 name_index;
3309 //    u2 descriptor_index
3310 //    u2 attributes_count;
3311 //    attribute_info_attributes[attributes_count];
3312 //  }
3313 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3314                                                      const ConstantPool* cp,
3315                                                      const u1* const record_attribute_start,
3316                                                      TRAPS) {
3317   const u1* const current_mark = cfs->current();
3318   int components_count = 0;
3319   unsigned int calculate_attr_size = 0;
3320   if (record_attribute_start != NULL) {

3565   }
3566   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3567                      "Bad length on BootstrapMethods in class file %s",
3568                      CHECK);
3569 }
3570 
3571 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3572                                                  ConstantPool* cp,
3573                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3574                                                  TRAPS) {
3575   assert(cfs != NULL, "invariant");
3576   assert(cp != NULL, "invariant");
3577   assert(parsed_annotations != NULL, "invariant");
3578 
3579   // Set inner classes attribute to default sentinel
3580   _inner_classes = Universe::the_empty_short_array();
3581   // Set nest members attribute to default sentinel
3582   _nest_members = Universe::the_empty_short_array();
3583   // Set _permitted_subclasses attribute to default sentinel
3584   _permitted_subclasses = Universe::the_empty_short_array();


3585   cfs->guarantee_more(2, CHECK);  // attributes_count
3586   u2 attributes_count = cfs->get_u2_fast();
3587   bool parsed_sourcefile_attribute = false;
3588   bool parsed_innerclasses_attribute = false;
3589   bool parsed_nest_members_attribute = false;
3590   bool parsed_permitted_subclasses_attribute = false;

3591   bool parsed_nest_host_attribute = false;
3592   bool parsed_record_attribute = false;
3593   bool parsed_enclosingmethod_attribute = false;
3594   bool parsed_bootstrap_methods_attribute = false;
3595   const u1* runtime_visible_annotations = NULL;
3596   int runtime_visible_annotations_length = 0;
3597   const u1* runtime_invisible_annotations = NULL;
3598   int runtime_invisible_annotations_length = 0;
3599   const u1* runtime_visible_type_annotations = NULL;
3600   int runtime_visible_type_annotations_length = 0;
3601   const u1* runtime_invisible_type_annotations = NULL;
3602   int runtime_invisible_type_annotations_length = 0;
3603   bool runtime_invisible_type_annotations_exists = false;
3604   bool runtime_invisible_annotations_exists = false;
3605   bool parsed_source_debug_ext_annotations_exist = false;
3606   const u1* inner_classes_attribute_start = NULL;
3607   u4  inner_classes_attribute_length = 0;
3608   u2  enclosing_method_class_index = 0;
3609   u2  enclosing_method_method_index = 0;
3610   const u1* nest_members_attribute_start = NULL;
3611   u4  nest_members_attribute_length = 0;
3612   const u1* record_attribute_start = NULL;
3613   u4  record_attribute_length = 0;
3614   const u1* permitted_subclasses_attribute_start = NULL;
3615   u4  permitted_subclasses_attribute_length = 0;


3616 
3617   // Iterate over attributes
3618   while (attributes_count--) {
3619     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3620     const u2 attribute_name_index = cfs->get_u2_fast();
3621     const u4 attribute_length = cfs->get_u4_fast();
3622     check_property(
3623       valid_symbol_at(attribute_name_index),
3624       "Attribute name has bad constant pool index %u in class file %s",
3625       attribute_name_index, CHECK);
3626     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3627     if (tag == vmSymbols::tag_source_file()) {
3628       // Check for SourceFile tag
3629       if (_need_verify) {
3630         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3631       }
3632       if (parsed_sourcefile_attribute) {
3633         classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3634         return;
3635       } else {

3822               return;
3823             }
3824             parsed_record_attribute = true;
3825             record_attribute_start = cfs->current();
3826             record_attribute_length = attribute_length;
3827           } else if (_major_version >= JAVA_17_VERSION) {
3828             if (tag == vmSymbols::tag_permitted_subclasses()) {
3829               if (parsed_permitted_subclasses_attribute) {
3830                 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3831                 return;
3832               }
3833               // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3834               if (_access_flags.is_final()) {
3835                 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3836                 return;
3837               }
3838               parsed_permitted_subclasses_attribute = true;
3839               permitted_subclasses_attribute_start = cfs->current();
3840               permitted_subclasses_attribute_length = attribute_length;
3841             }









3842           }
3843           // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3844           cfs->skip_u1(attribute_length, CHECK);
3845         } else {
3846           // Unknown attribute
3847           cfs->skip_u1(attribute_length, CHECK);
3848         }
3849       } else {
3850         // Unknown attribute
3851         cfs->skip_u1(attribute_length, CHECK);
3852       }
3853     } else {
3854       // Unknown attribute
3855       cfs->skip_u1(attribute_length, CHECK);
3856     }
3857   }
3858   _class_annotations = assemble_annotations(runtime_visible_annotations,
3859                                             runtime_visible_annotations_length,
3860                                             runtime_invisible_annotations,
3861                                             runtime_invisible_annotations_length,

3902                             CHECK);
3903     if (_need_verify) {
3904       guarantee_property(record_attribute_length == calculated_attr_length,
3905                          "Record attribute has wrong length in class file %s",
3906                          CHECK);
3907     }
3908   }
3909 
3910   if (parsed_permitted_subclasses_attribute) {
3911     const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3912                             cfs,
3913                             permitted_subclasses_attribute_start,
3914                             CHECK);
3915     if (_need_verify) {
3916       guarantee_property(
3917         permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3918         "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3919     }
3920   }
3921 












3922   if (_max_bootstrap_specifier_index >= 0) {
3923     guarantee_property(parsed_bootstrap_methods_attribute,
3924                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3925   }
3926 }
3927 
3928 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3929   assert(k != NULL, "invariant");
3930 
3931   if (_synthetic_flag)
3932     k->set_is_synthetic();
3933   if (_sourcefile_index != 0) {
3934     k->set_source_file_name_index(_sourcefile_index);
3935   }
3936   if (_generic_signature_index != 0) {
3937     k->set_generic_signature_index(_generic_signature_index);
3938   }
3939   if (_sde_buffer != NULL) {
3940     k->set_source_debug_extension(_sde_buffer, _sde_length);
3941   }

3966     // _combined_annotations so these fields can now be cleared.
3967     _class_annotations       = NULL;
3968     _class_type_annotations  = NULL;
3969     _fields_annotations      = NULL;
3970     _fields_type_annotations = NULL;
3971 }
3972 
3973 // Transfer ownership of metadata allocated to the InstanceKlass.
3974 void ClassFileParser::apply_parsed_class_metadata(
3975                                             InstanceKlass* this_klass,
3976                                             int java_fields_count) {
3977   assert(this_klass != NULL, "invariant");
3978 
3979   _cp->set_pool_holder(this_klass);
3980   this_klass->set_constants(_cp);
3981   this_klass->set_fields(_fields, java_fields_count);
3982   this_klass->set_methods(_methods);
3983   this_klass->set_inner_classes(_inner_classes);
3984   this_klass->set_nest_members(_nest_members);
3985   this_klass->set_nest_host_index(_nest_host);

3986   this_klass->set_annotations(_combined_annotations);
3987   this_klass->set_permitted_subclasses(_permitted_subclasses);
3988   this_klass->set_record_components(_record_components);
3989   // Delay the setting of _local_interfaces and _transitive_interfaces until after
3990   // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3991   // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3992   // its _super. If an OOM occurs while loading the current klass, its _super field
3993   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3994   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3995   // dereferences to the deallocated _transitive_interfaces will result in a crash.
3996 
3997   // Clear out these fields so they don't get deallocated by the destructor
3998   clear_class_metadata();
3999 }
4000 
4001 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
4002                                                        int runtime_visible_annotations_length,
4003                                                        const u1* const runtime_invisible_annotations,
4004                                                        int runtime_invisible_annotations_length,
4005                                                        TRAPS) {

4017     }
4018     if (runtime_invisible_annotations != NULL) {
4019       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4020         int append = runtime_visible_annotations_length+i;
4021         annotations->at_put(append, runtime_invisible_annotations[i]);
4022       }
4023     }
4024   }
4025   return annotations;
4026 }
4027 
4028 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4029                                                         const int super_class_index,
4030                                                         const bool need_verify,
4031                                                         TRAPS) {
4032   assert(cp != NULL, "invariant");
4033   const InstanceKlass* super_klass = NULL;
4034 
4035   if (super_class_index == 0) {
4036     check_property(_class_name == vmSymbols::java_lang_Object(),
4037                    "Invalid superclass index %u in class file %s",
4038                    super_class_index,
4039                    CHECK_NULL);
4040   } else {
4041     check_property(valid_klass_reference_at(super_class_index),
4042                    "Invalid superclass index %u in class file %s",
4043                    super_class_index,
4044                    CHECK_NULL);
4045     // The class name should be legal because it is checked when parsing constant pool.
4046     // However, make sure it is not an array type.
4047     bool is_array = false;
4048     if (cp->tag_at(super_class_index).is_klass()) {
4049       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
4050       if (need_verify)
4051         is_array = super_klass->is_array_klass();
4052     } else if (need_verify) {
4053       is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4054     }
4055     if (need_verify) {

4056       guarantee_property(!is_array,
4057                         "Bad superclass name in class file %s", CHECK_NULL);
4058     }
4059   }
4060   return super_klass;
4061 }
4062 
4063 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4064   _max_nonstatic_oop_maps = max_blocks;
4065   _nonstatic_oop_map_count = 0;
4066   if (max_blocks == 0) {
4067     _nonstatic_oop_maps = NULL;
4068   } else {
4069     _nonstatic_oop_maps =
4070         NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4071     memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4072   }
4073 }
4074 
4075 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {

4159 }
4160 
4161 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4162   st->print_cr("  OopMapBlocks: %3d  /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4163   if (_nonstatic_oop_map_count > 0) {
4164     OopMapBlock* map = _nonstatic_oop_maps;
4165     OopMapBlock* last_map = last_oop_map();
4166     assert(map <= last_map, "Last less than first");
4167     while (map <= last_map) {
4168       st->print_cr("    Offset: %3d  -%3d Count: %3d", map->offset(),
4169                    map->offset() + map->offset_span() - heapOopSize, map->count());
4170       map++;
4171     }
4172   }
4173 }
4174 
4175 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4176   print_on(st);
4177 }
4178 



















4179 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4180   assert(ik != NULL, "invariant");
4181 
4182   const Klass* const super = ik->super();
4183 
4184   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4185   // in which case we don't have to register objects as finalizable
4186   if (!_has_empty_finalizer) {
4187     if (_has_finalizer ||
4188         (super != NULL && super->has_finalizer())) {
4189       ik->set_has_finalizer();
4190     }
4191   }
4192 
4193 #ifdef ASSERT
4194   bool f = false;
4195   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4196                                            vmSymbols::void_method_signature());
4197   if (InstanceKlass::is_finalization_enabled() &&
4198       (m != NULL) && !m->is_empty_method()) {
4199       f = true;
4200   }
4201 
4202   // Spec doesn't prevent agent from redefinition of empty finalizer.
4203   // Despite the fact that it's generally bad idea and redefined finalizer
4204   // will not work as expected we shouldn't abort vm in this case
4205   if (!ik->has_redefined_this_or_super()) {
4206     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4207   }
4208 #endif
4209 
4210   // Check if this klass supports the java.lang.Cloneable interface
4211   if (vmClasses::Cloneable_klass_loaded()) {
4212     if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {





4213       ik->set_is_cloneable();
4214     }
4215   }
4216 
4217   // Check if this klass has a vanilla default constructor
4218   if (super == NULL) {
4219     // java.lang.Object has empty default constructor
4220     ik->set_has_vanilla_constructor();
4221   } else {
4222     if (super->has_vanilla_constructor() &&
4223         _has_vanilla_constructor) {
4224       ik->set_has_vanilla_constructor();
4225     }
4226 #ifdef ASSERT
4227     bool v = false;
4228     if (super->has_vanilla_constructor()) {
4229       const Method* const constructor =
4230         ik->find_method(vmSymbols::object_initializer_name(),
4231                        vmSymbols::void_method_signature());
4232       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4233         v = true;
4234       }
4235     }
4236     assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4237 #endif
4238   }
4239 
4240   // If it cannot be fast-path allocated, set a bit in the layout helper.
4241   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4242   assert(ik->size_helper() > 0, "layout_helper is initialized");
4243   if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4244       || ik->is_abstract() || ik->is_interface()
4245       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4246       || ik->size_helper() >= FastAllocateSizeLimit) {
4247     // Forbid fast-path allocation.
4248     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4249     ik->set_layout_helper(lh);
4250   }
4251 }
4252 






4253 // utility methods for appending an array with check for duplicates
4254 
4255 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4256                               const Array<InstanceKlass*>* const ifs) {
4257   // iterate over new interfaces
4258   for (int i = 0; i < ifs->length(); i++) {
4259     InstanceKlass* const e = ifs->at(i);
4260     assert(e->is_klass() && e->is_interface(), "just checking");
4261     // add new interface
4262     result->append_if_missing(e);
4263   }
4264 }
4265 
4266 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4267                                                             Array<InstanceKlass*>* local_ifs,
4268                                                             ClassLoaderData* loader_data,
4269                                                             TRAPS) {
4270   assert(local_ifs != NULL, "invariant");
4271   assert(loader_data != NULL, "invariant");
4272 

4276   // Add superclass transitive interfaces size
4277   if (super != NULL) {
4278     super_size = super->transitive_interfaces()->length();
4279     max_transitive_size += super_size;
4280   }
4281   // Add local interfaces' super interfaces
4282   const int local_size = local_ifs->length();
4283   for (int i = 0; i < local_size; i++) {
4284     InstanceKlass* const l = local_ifs->at(i);
4285     max_transitive_size += l->transitive_interfaces()->length();
4286   }
4287   // Finally add local interfaces
4288   max_transitive_size += local_size;
4289   // Construct array
4290   if (max_transitive_size == 0) {
4291     // no interfaces, use canonicalized array
4292     return Universe::the_empty_instance_klass_array();
4293   } else if (max_transitive_size == super_size) {
4294     // no new local interfaces added, share superklass' transitive interface array
4295     return super->transitive_interfaces();
4296   } else if (max_transitive_size == local_size) {
4297     // only local interfaces added, share local interface array
4298     return local_ifs;

4299   } else {
4300     ResourceMark rm;
4301     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4302 
4303     // Copy down from superclass
4304     if (super != NULL) {
4305       append_interfaces(result, super->transitive_interfaces());
4306     }
4307 
4308     // Copy down from local interfaces' superinterfaces
4309     for (int i = 0; i < local_size; i++) {
4310       InstanceKlass* const l = local_ifs->at(i);
4311       append_interfaces(result, l->transitive_interfaces());
4312     }
4313     // Finally add local interfaces
4314     append_interfaces(result, local_ifs);
4315 
4316     // length will be less than the max_transitive_size if duplicates were removed
4317     const int length = result->length();
4318     assert(length <= max_transitive_size, "just checking");

4319     Array<InstanceKlass*>* const new_result =
4320       MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4321     for (int i = 0; i < length; i++) {
4322       InstanceKlass* const e = result->at(i);
4323       assert(e != NULL, "just checking");
4324       new_result->at_put(i, e);
4325     }
4326     return new_result;
4327   }
4328 }
4329 
4330 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4331   assert(this_klass != NULL, "invariant");
4332   const Klass* const super = this_klass->super();
4333 
4334   if (super != NULL) {
4335     const InstanceKlass* super_ik = InstanceKlass::cast(super);
4336 
4337     if (super->is_final()) {
4338       classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4339       return;
4340     }
4341 
4342     if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4343       classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4344       return;
4345     }
4346 










4347     // If the loader is not the boot loader then throw an exception if its
4348     // superclass is in package jdk.internal.reflect and its loader is not a
4349     // special reflection class loader
4350     if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4351       PackageEntry* super_package = super->package();
4352       if (super_package != NULL &&
4353           super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4354           !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4355         ResourceMark rm(THREAD);
4356         Exceptions::fthrow(
4357           THREAD_AND_LOCATION,
4358           vmSymbols::java_lang_IllegalAccessError(),
4359           "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4360           this_klass->external_name(),
4361           this_klass->class_loader_data()->loader_name_and_id(),
4362           super->external_name());
4363         return;
4364       }
4365     }
4366 

4510 
4511   for (int index = 0; index < num_methods; index++) {
4512     const Method* const m = methods->at(index);
4513     // if m is static and not the init method, throw a verify error
4514     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4515       ResourceMark rm(THREAD);
4516       Exceptions::fthrow(
4517         THREAD_AND_LOCATION,
4518         vmSymbols::java_lang_VerifyError(),
4519         "Illegal static method %s in interface %s",
4520         m->name()->as_C_string(),
4521         this_klass->external_name()
4522       );
4523       return;
4524     }
4525   }
4526 }
4527 
4528 // utility methods for format checking
4529 
4530 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4531   const bool is_module = (flags & JVM_ACC_MODULE) != 0;




4532   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4533   if (is_module) {
4534     ResourceMark rm(THREAD);
4535     Exceptions::fthrow(
4536       THREAD_AND_LOCATION,
4537       vmSymbols::java_lang_NoClassDefFoundError(),
4538       "%s is not a class because access_flag ACC_MODULE is set",
4539       _class_name->as_C_string());
4540     return;
4541   }
4542 
4543   if (!_need_verify) { return; }






















4544 
4545   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4546   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4547   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4548   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4549   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4550   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4551   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4552 
4553   if ((is_abstract && is_final) ||
4554       (is_interface && !is_abstract) ||
4555       (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4556       (!is_interface && major_gte_1_5 && is_annotation)) {




4557     ResourceMark rm(THREAD);
4558     Exceptions::fthrow(
4559       THREAD_AND_LOCATION,
4560       vmSymbols::java_lang_ClassFormatError(),
4561       "Illegal class modifiers in class %s: 0x%X",
4562       _class_name->as_C_string(), flags
4563     );
4564     return;














4565   }
4566 }
4567 
4568 static bool has_illegal_visibility(jint flags) {
4569   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4570   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4571   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4572 
4573   return ((is_public && is_protected) ||
4574           (is_public && is_private) ||
4575           (is_protected && is_private));
4576 }
4577 
4578 // A legal major_version.minor_version must be one of the following:
4579 //
4580 //  Major_version >= 45 and major_version < 56, any minor_version.
4581 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4582 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4583 //
4584 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){

4610         THREAD_AND_LOCATION,
4611         vmSymbols::java_lang_UnsupportedClassVersionError(),
4612         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4613         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4614         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4615       return;
4616     }
4617 
4618     if (!Arguments::enable_preview()) {
4619       classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4620                            class_name, major, minor, THREAD);
4621       return;
4622     }
4623 
4624   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4625     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4626                          class_name, major, minor, THREAD);
4627   }
4628 }
4629 
4630 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4631                                                    bool is_interface,
4632                                                    TRAPS) const {
4633   if (!_need_verify) { return; }
4634 
4635   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4636   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4637   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4638   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4639   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4640   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4641   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4642   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4643   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4644 





4645   bool is_illegal = false;
4646 
4647   if (is_interface) {
4648     if (!is_public || !is_static || !is_final || is_private ||
4649         is_protected || is_volatile || is_transient ||
4650         (major_gte_1_5 && is_enum)) {
4651       is_illegal = true;
4652     }
4653   } else { // not interface
4654     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4655       is_illegal = true;






4656     }
4657   }
4658 
4659   if (is_illegal) {
4660     ResourceMark rm(THREAD);
4661     Exceptions::fthrow(
4662       THREAD_AND_LOCATION,
4663       vmSymbols::java_lang_ClassFormatError(),
4664       "Illegal field modifiers in class %s: 0x%X",
4665       _class_name->as_C_string(), flags);
4666     return;
4667   }
4668 }
4669 
4670 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4671                                                     bool is_interface,
4672                                                     const Symbol* name,
4673                                                     TRAPS) const {
4674   if (!_need_verify) { return; }
4675 
4676   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4677   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4678   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4679   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4680   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4681   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4682   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4683   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4684   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4685   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4686   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
4687   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4688   const bool major_gte_17    = _major_version >= JAVA_17_VERSION;
4689   const bool is_initializer  = (name == vmSymbols::object_initializer_name());





4690 
4691   bool is_illegal = false;
4692 

4693   if (is_interface) {
4694     if (major_gte_8) {
4695       // Class file version is JAVA_8_VERSION or later Methods of
4696       // interfaces may set any of the flags except ACC_PROTECTED,
4697       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4698       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4699       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4700           (is_native || is_protected || is_final || is_synchronized) ||
4701           // If a specific method of a class or interface has its
4702           // ACC_ABSTRACT flag set, it must not have any of its
4703           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4704           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4705           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4706           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4707           (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4708         is_illegal = true;
4709       }
4710     } else if (major_gte_1_5) {
4711       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4712       if (!is_public || is_private || is_protected || is_static || is_final ||
4713           is_synchronized || is_native || !is_abstract || is_strict) {
4714         is_illegal = true;
4715       }
4716     } else {
4717       // Class file version is pre-JAVA_1_5_VERSION
4718       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4719         is_illegal = true;
4720       }
4721     }
4722   } else { // not interface
4723     if (has_illegal_visibility(flags)) {
4724       is_illegal = true;
4725     } else {
4726       if (is_initializer) {






4727         if (is_static || is_final || is_synchronized || is_native ||
4728             is_abstract || (major_gte_1_5 && is_bridge)) {
4729           is_illegal = true;
4730         }
4731       } else { // not initializer
4732         if (is_abstract) {
4733           if ((is_final || is_native || is_private || is_static ||
4734               (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4735             is_illegal = true;





4736           }
4737         }
4738       }
4739     }
4740   }
4741 
4742   if (is_illegal) {
4743     ResourceMark rm(THREAD);
4744     Exceptions::fthrow(
4745       THREAD_AND_LOCATION,
4746       vmSymbols::java_lang_ClassFormatError(),
4747       "Method %s in class %s has illegal modifiers: 0x%X",
4748       name->as_C_string(), _class_name->as_C_string(), flags);









4749     return;
4750   }
4751 }
4752 
4753 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4754                                         int length,
4755                                         TRAPS) const {
4756   assert(_need_verify, "only called when _need_verify is true");
4757   if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4758     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4759   }
4760 }
4761 
4762 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4763 // In class names, '/' separates unqualified names.  This is verified in this function also.
4764 // Method names also may not contain the characters '<' or '>', unless <init>
4765 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4766 // method.  Because these names have been checked as special cases before
4767 // calling this method in verify_legal_method_name.
4768 //

4886 // be taken as a field signature. Allow "void" if void_ok.
4887 // Return a pointer to just past the signature.
4888 // Return NULL if no legal signature is found.
4889 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4890                                                        bool void_ok,
4891                                                        unsigned int length,
4892                                                        TRAPS) const {
4893   unsigned int array_dim = 0;
4894   while (length > 0) {
4895     switch (signature[0]) {
4896     case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
4897     case JVM_SIGNATURE_BOOLEAN:
4898     case JVM_SIGNATURE_BYTE:
4899     case JVM_SIGNATURE_CHAR:
4900     case JVM_SIGNATURE_SHORT:
4901     case JVM_SIGNATURE_INT:
4902     case JVM_SIGNATURE_FLOAT:
4903     case JVM_SIGNATURE_LONG:
4904     case JVM_SIGNATURE_DOUBLE:
4905       return signature + 1;
4906     case JVM_SIGNATURE_CLASS: {











4907       if (_major_version < JAVA_1_5_VERSION) {
4908         // Skip over the class name if one is there
4909         const char* const p = skip_over_field_name(signature + 1, true, --length);
4910 
4911         // The next character better be a semicolon
4912         if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4913           return p + 1;
4914         }
4915       }
4916       else {
4917         // Skip leading 'L' and ignore first appearance of ';'
4918         signature++;
4919         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4920         // Format check signature
4921         if (c != NULL) {
4922           int newlen = c - (char*) signature;
4923           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4924           if (!legal) {
4925             classfile_parse_error("Class name is empty or contains illegal character "
4926                                   "in descriptor in class file %s",
4927                                   THREAD);
4928             return NULL;
4929           }
4930           return signature + newlen + 1;
4931         }
4932       }
4933       return NULL;
4934     }
4935     case JVM_SIGNATURE_ARRAY:
4936       array_dim++;
4937       if (array_dim > 255) {

4953 
4954 // Checks if name is a legal class name.
4955 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4956   if (!_need_verify || _relax_verify) { return; }
4957 
4958   assert(name->refcount() > 0, "symbol must be kept alive");
4959   char* bytes = (char*)name->bytes();
4960   unsigned int length = name->utf8_length();
4961   bool legal = false;
4962 
4963   if (length > 0) {
4964     const char* p;
4965     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4966       p = skip_over_field_signature(bytes, false, length, CHECK);
4967       legal = (p != NULL) && ((p - bytes) == (int)length);
4968     } else if (_major_version < JAVA_1_5_VERSION) {
4969       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4970         p = skip_over_field_name(bytes, true, length);
4971         legal = (p != NULL) && ((p - bytes) == (int)length);
4972       }




4973     } else {
4974       // 4900761: relax the constraints based on JSR202 spec
4975       // Class names may be drawn from the entire Unicode character set.
4976       // Identifiers between '/' must be unqualified names.
4977       // The utf8 string has been verified when parsing cpool entries.
4978       legal = verify_unqualified_name(bytes, length, LegalClass);
4979     }
4980   }
4981   if (!legal) {
4982     ResourceMark rm(THREAD);
4983     assert(_class_name != NULL, "invariant");
4984     Exceptions::fthrow(
4985       THREAD_AND_LOCATION,
4986       vmSymbols::java_lang_ClassFormatError(),
4987       "Illegal class name \"%.*s\" in class file %s", length, bytes,
4988       _class_name->as_C_string()
4989     );
4990     return;
4991   }
4992 }

5018       THREAD_AND_LOCATION,
5019       vmSymbols::java_lang_ClassFormatError(),
5020       "Illegal field name \"%.*s\" in class %s", length, bytes,
5021       _class_name->as_C_string()
5022     );
5023     return;
5024   }
5025 }
5026 
5027 // Checks if name is a legal method name.
5028 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5029   if (!_need_verify || _relax_verify) { return; }
5030 
5031   assert(name != NULL, "method name is null");
5032   char* bytes = (char*)name->bytes();
5033   unsigned int length = name->utf8_length();
5034   bool legal = false;
5035 
5036   if (length > 0) {
5037     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5038       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {



5039         legal = true;
5040       }
5041     } else if (_major_version < JAVA_1_5_VERSION) {
5042       const char* p;
5043       p = skip_over_field_name(bytes, false, length);
5044       legal = (p != NULL) && ((p - bytes) == (int)length);
5045     } else {
5046       // 4881221: relax the constraints based on JSR202 spec
5047       legal = verify_unqualified_name(bytes, length, LegalMethod);
5048     }
5049   }
5050 
5051   if (!legal) {
5052     ResourceMark rm(THREAD);
5053     assert(_class_name != NULL, "invariant");
5054     Exceptions::fthrow(
5055       THREAD_AND_LOCATION,
5056       vmSymbols::java_lang_ClassFormatError(),
5057       "Illegal method name \"%.*s\" in class %s", length, bytes,
5058       _class_name->as_C_string()
5059     );
5060     return;
5061   }
5062 }
5063 
5064 
5065 // Checks if signature is a legal field signature.
5066 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5067                                                    const Symbol* signature,
5068                                                    TRAPS) const {
5069   if (!_need_verify) { return; }



5070 
5071   const char* const bytes = (const char* const)signature->bytes();
5072   const unsigned int length = signature->utf8_length();
5073   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5074 
5075   if (p == NULL || (p - bytes) != (int)length) {
5076     throwIllegalSignature("Field", name, signature, CHECK);
5077   }
5078 }
5079 
5080 // Check that the signature is compatible with the method name.  For example,
5081 // check that <init> has a void signature.
5082 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5083                                                        const Symbol* signature,
5084                                                        TRAPS) const {
5085   if (!_need_verify) {
5086     return;
5087   }
5088 
5089   // Class initializers cannot have args for class format version >= 51.
5090   if (name == vmSymbols::class_initializer_name() &&
5091       signature != vmSymbols::void_method_signature() &&
5092       _major_version >= JAVA_7_VERSION) {
5093     throwIllegalSignature("Method", name, signature, THREAD);
5094     return;
5095   }
5096 
5097   int sig_length = signature->utf8_length();
5098   if (name->utf8_length() > 0 &&

5099       name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5100       sig_length > 0 &&
5101       signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5102     throwIllegalSignature("Method", name, signature, THREAD);

5103   }
5104 }
5105 
5106 // Checks if signature is a legal method signature.
5107 // Returns number of parameters
5108 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5109                                                    const Symbol* signature,
5110                                                    TRAPS) const {
5111   if (!_need_verify) {
5112     // make sure caller's args_size will be less than 0 even for non-static
5113     // method so it will be recomputed in compute_size_of_parameters().
5114     return -2;
5115   }
5116 
5117   unsigned int args_size = 0;
5118   const char* p = (const char*)signature->bytes();
5119   unsigned int length = signature->utf8_length();
5120   const char* nextp;
5121 
5122   // The first character must be a '('

5258   }
5259 }
5260 
5261 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5262                                                       const ClassInstanceInfo& cl_inst_info,
5263                                                       TRAPS) {
5264   if (_klass != NULL) {
5265     return _klass;
5266   }
5267 
5268   InstanceKlass* const ik =
5269     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5270 
5271   if (is_hidden()) {
5272     mangle_hidden_class_name(ik);
5273   }
5274 
5275   fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5276 
5277   assert(_klass == ik, "invariant");
5278 
5279   return ik;
5280 }
5281 
5282 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5283                                           bool changed_by_loadhook,
5284                                           const ClassInstanceInfo& cl_inst_info,
5285                                           TRAPS) {
5286   assert(ik != NULL, "invariant");
5287 
5288   // Set name and CLD before adding to CLD
5289   ik->set_class_loader_data(_loader_data);
5290   ik->set_name(_class_name);
5291 
5292   // Add all classes to our internal class loader list here,
5293   // including classes in the bootstrap (NULL) class loader.
5294   const bool publicize = !is_internal();
5295 
5296   _loader_data->add_class(ik, publicize);
5297 
5298   set_klass_to_deallocate(ik);
5299 
5300   assert(_field_info != NULL, "invariant");
5301   assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5302   assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5303          "sanity");
5304 
5305   assert(ik->is_instance_klass(), "sanity");
5306   assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5307 
5308   // Fill in information already parsed
5309   ik->set_should_verify_class(_need_verify);
5310 
5311   // Not yet: supers are done below to support the new subtype-checking fields
5312   ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5313   ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);










5314   assert(_fac != NULL, "invariant");
5315   ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5316 
5317   // this transfers ownership of a lot of arrays from
5318   // the parser onto the InstanceKlass*
5319   apply_parsed_class_metadata(ik, _java_fields_count);
5320 
5321   // can only set dynamic nest-host after static nest information is set
5322   if (cl_inst_info.dynamic_nest_host() != NULL) {
5323     ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5324   }
5325 
5326   // note that is not safe to use the fields in the parser from this point on
5327   assert(NULL == _cp, "invariant");
5328   assert(NULL == _fields, "invariant");
5329   assert(NULL == _methods, "invariant");
5330   assert(NULL == _inner_classes, "invariant");
5331   assert(NULL == _nest_members, "invariant");

5332   assert(NULL == _combined_annotations, "invariant");
5333   assert(NULL == _record_components, "invariant");
5334   assert(NULL == _permitted_subclasses, "invariant");
5335 
5336   if (_has_final_method) {
5337     ik->set_has_final_method();
5338   }
5339 
5340   ik->copy_method_ordering(_method_ordering, CHECK);
5341   // The InstanceKlass::_methods_jmethod_ids cache
5342   // is managed on the assumption that the initial cache
5343   // size is equal to the number of methods in the class. If
5344   // that changes, then InstanceKlass::idnum_can_increment()
5345   // has to be changed accordingly.
5346   ik->set_initial_method_idnum(ik->methods()->length());
5347 
5348   ik->set_this_class_index(_this_class_index);
5349 
5350   if (_is_hidden) {
5351     // _this_class_index is a CONSTANT_Class entry that refers to this
5352     // hidden class itself. If this class needs to refer to its own methods
5353     // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5354     // _this_class_index. However, because this class is hidden (it's
5355     // not stored in SystemDictionary), _this_class_index cannot be resolved
5356     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5357     // Therefore, we must eagerly resolve _this_class_index now.
5358     ik->constants()->klass_at_put(_this_class_index, ik);
5359   }
5360 
5361   ik->set_minor_version(_minor_version);
5362   ik->set_major_version(_major_version);
5363   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5364   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);



5365 
5366   if (_is_hidden) {
5367     ik->set_is_hidden();
5368   }
5369 
5370   // Set PackageEntry for this_klass
5371   oop cl = ik->class_loader();
5372   Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5373   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5374   ik->set_package(cld, NULL, CHECK);
5375 
5376   const Array<Method*>* const methods = ik->methods();
5377   assert(methods != NULL, "invariant");
5378   const int methods_len = methods->length();
5379 
5380   check_methods_for_intrinsics(ik, methods);
5381 
5382   // Fill in field values obtained by parse_classfile_attributes
5383   if (_parsed_annotations->has_any_annotations()) {
5384     _parsed_annotations->apply_to(ik);

5452 
5453   assert(_all_mirandas != NULL, "invariant");
5454 
5455   // Generate any default methods - default methods are public interface methods
5456   // that have a default implementation.  This is new with Java 8.
5457   if (_has_nonstatic_concrete_methods) {
5458     DefaultMethods::generate_default_methods(ik,
5459                                              _all_mirandas,
5460                                              CHECK);
5461   }
5462 
5463   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5464   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5465       !module_entry->has_default_read_edges()) {
5466     if (!module_entry->set_has_default_read_edges()) {
5467       // We won a potential race
5468       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5469     }
5470   }
5471 



























5472   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5473 
5474   if (!is_internal()) {
5475     ik->print_class_load_logging(_loader_data, module_entry, _stream);
5476 
5477     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5478         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5479         log_is_enabled(Info, class, preview)) {
5480       ResourceMark rm;
5481       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5482                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5483     }
5484 
5485     if (log_is_enabled(Debug, class, resolve))  {
5486       ResourceMark rm;
5487       // print out the superclass.
5488       const char * from = ik->external_name();
5489       if (ik->java_super() != NULL) {
5490         log_debug(class, resolve)("%s %s (super)",
5491                    from,

5542 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5543                                  Symbol* name,
5544                                  ClassLoaderData* loader_data,
5545                                  const ClassLoadInfo* cl_info,
5546                                  Publicity pub_level,
5547                                  TRAPS) :
5548   _stream(stream),
5549   _class_name(NULL),
5550   _loader_data(loader_data),
5551   _is_hidden(cl_info->is_hidden()),
5552   _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5553   _orig_cp_size(0),
5554   _super_klass(),
5555   _cp(NULL),
5556   _fields(NULL),
5557   _methods(NULL),
5558   _inner_classes(NULL),
5559   _nest_members(NULL),
5560   _nest_host(0),
5561   _permitted_subclasses(NULL),

5562   _record_components(NULL),
5563   _local_interfaces(NULL),

5564   _transitive_interfaces(NULL),
5565   _combined_annotations(NULL),
5566   _class_annotations(NULL),
5567   _class_type_annotations(NULL),
5568   _fields_annotations(NULL),
5569   _fields_type_annotations(NULL),
5570   _klass(NULL),
5571   _klass_to_deallocate(NULL),
5572   _parsed_annotations(NULL),
5573   _fac(NULL),
5574   _field_info(NULL),

5575   _method_ordering(NULL),
5576   _all_mirandas(NULL),
5577   _vtable_size(0),
5578   _itable_size(0),
5579   _num_miranda_methods(0),
5580   _protection_domain(cl_info->protection_domain()),
5581   _access_flags(),
5582   _pub_level(pub_level),
5583   _bad_constant_seen(0),
5584   _synthetic_flag(false),
5585   _sde_length(false),
5586   _sde_buffer(NULL),
5587   _sourcefile_index(0),
5588   _generic_signature_index(0),
5589   _major_version(0),
5590   _minor_version(0),
5591   _this_class_index(0),
5592   _super_class_index(0),
5593   _itfs_len(0),
5594   _java_fields_count(0),
5595   _need_verify(false),
5596   _relax_verify(false),
5597   _has_nonstatic_concrete_methods(false),
5598   _declares_nonstatic_concrete_methods(false),
5599   _has_final_method(false),
5600   _has_contended_fields(false),







5601   _has_finalizer(false),
5602   _has_empty_finalizer(false),
5603   _has_vanilla_constructor(false),
5604   _max_bootstrap_specifier_index(-1) {
5605 
5606   _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
5607   _class_name->increment_refcount();
5608 
5609   assert(_loader_data != NULL, "invariant");
5610   assert(stream != NULL, "invariant");
5611   assert(_stream != NULL, "invariant");
5612   assert(_stream->buffer() == _stream->current(), "invariant");
5613   assert(_class_name != NULL, "invariant");
5614   assert(0 == _access_flags.as_int(), "invariant");
5615 
5616   // Figure out whether we can skip format checking (matching classic VM behavior)
5617   if (DumpSharedSpaces) {
5618     // verify == true means it's a 'remote' class (i.e., non-boot class)
5619     // Verification decision is based on BytecodeVerificationRemote flag
5620     // for those classes.

5630   stream->set_verify(_need_verify);
5631 
5632   // Check if verification needs to be relaxed for this class file
5633   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5634   _relax_verify = relax_format_check_for(_loader_data);
5635 
5636   parse_stream(stream, CHECK);
5637 
5638   post_process_parsed_stream(stream, _cp, CHECK);
5639 }
5640 
5641 void ClassFileParser::clear_class_metadata() {
5642   // metadata created before the instance klass is created.  Must be
5643   // deallocated if classfile parsing returns an error.
5644   _cp = NULL;
5645   _fields = NULL;
5646   _methods = NULL;
5647   _inner_classes = NULL;
5648   _nest_members = NULL;
5649   _permitted_subclasses = NULL;

5650   _combined_annotations = NULL;
5651   _class_annotations = _class_type_annotations = NULL;
5652   _fields_annotations = _fields_type_annotations = NULL;
5653   _record_components = NULL;
5654 }
5655 
5656 // Destructor to clean up
5657 ClassFileParser::~ClassFileParser() {
5658   _class_name->decrement_refcount();
5659 
5660   if (_cp != NULL) {
5661     MetadataFactory::free_metadata(_loader_data, _cp);
5662   }
5663   if (_fields != NULL) {
5664     MetadataFactory::free_array<u2>(_loader_data, _fields);
5665   }
5666 




5667   if (_methods != NULL) {
5668     // Free methods
5669     InstanceKlass::deallocate_methods(_loader_data, _methods);
5670   }
5671 
5672   // beware of the Universe::empty_blah_array!!
5673   if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
5674     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5675   }
5676 
5677   if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
5678     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5679   }
5680 
5681   if (_record_components != NULL) {
5682     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5683   }
5684 
5685   if (_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array()) {
5686     MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5687   }
5688 




5689   // Free interfaces
5690   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5691                                        _local_interfaces, _transitive_interfaces);
5692 
5693   if (_combined_annotations != NULL) {
5694     // After all annotations arrays have been created, they are installed into the
5695     // Annotations object that will be assigned to the InstanceKlass being created.
5696 
5697     // Deallocate the Annotations object and the installed annotations arrays.
5698     _combined_annotations->deallocate_contents(_loader_data);
5699 
5700     // If the _combined_annotations pointer is non-NULL,
5701     // then the other annotations fields should have been cleared.
5702     assert(_class_annotations       == NULL, "Should have been cleared");
5703     assert(_class_type_annotations  == NULL, "Should have been cleared");
5704     assert(_fields_annotations      == NULL, "Should have been cleared");
5705     assert(_fields_type_annotations == NULL, "Should have been cleared");
5706   } else {
5707     // If the annotations arrays were not installed into the Annotations object,
5708     // then they have to be deallocated explicitly.

5753     cp_size, CHECK);
5754 
5755   _orig_cp_size = cp_size;
5756   if (is_hidden()) { // Add a slot for hidden class name.
5757     cp_size++;
5758   }
5759 
5760   _cp = ConstantPool::allocate(_loader_data,
5761                                cp_size,
5762                                CHECK);
5763 
5764   ConstantPool* const cp = _cp;
5765 
5766   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5767 
5768   assert(cp_size == (const u2)cp->length(), "invariant");
5769 
5770   // ACCESS FLAGS
5771   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
5772 
5773   // Access flags
5774   jint flags;
5775   // JVM_ACC_MODULE is defined in JDK-9 and later.
5776   if (_major_version >= JAVA_9_VERSION) {
5777     flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5778   } else {
5779     flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5780   }







5781 
5782   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5783     // Set abstract bit for old class files for backward compatibility
5784     flags |= JVM_ACC_ABSTRACT;
5785   }
5786 
5787   verify_legal_class_modifiers(flags, CHECK);
5788 
5789   short bad_constant = class_bad_constant_seen();
5790   if (bad_constant != 0) {
5791     // Do not throw CFE until after the access_flags are checked because if
5792     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5793     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5794     return;
5795   }
5796 
5797   _access_flags.set_flags(flags);
5798 
5799   // This class and superclass
5800   _this_class_index = stream->get_u2_fast();
5801   check_property(
5802     valid_cp_range(_this_class_index, cp_size) &&
5803       cp->tag_at(_this_class_index).is_unresolved_klass(),
5804     "Invalid this class index %u in constant pool in class file %s",
5805     _this_class_index, CHECK);
5806 
5807   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5808   assert(class_name_in_cp != NULL, "class_name can't be null");
5809 
































5810   // Don't need to check whether this class name is legal or not.
5811   // It has been checked when constant pool is parsed.
5812   // However, make sure it is not an array type.
5813   if (_need_verify) {
5814     guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5815                        "Bad class name in class file %s",
5816                        CHECK);
5817   }
5818 
5819 #ifdef ASSERT
5820   // Basic sanity checks
5821   if (_is_hidden) {
5822     assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5823   }
5824 #endif
5825 
5826   // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5827 
5828   if (_is_hidden) {
5829     assert(_class_name != NULL, "Unexpected null _class_name");

5867       if (stream->source() != NULL) {
5868         ls.print(" source: %s", stream->source());
5869       }
5870       ls.cr();
5871     }
5872   }
5873 
5874   // SUPERKLASS
5875   _super_class_index = stream->get_u2_fast();
5876   _super_klass = parse_super_class(cp,
5877                                    _super_class_index,
5878                                    _need_verify,
5879                                    CHECK);
5880 
5881   // Interfaces
5882   _itfs_len = stream->get_u2_fast();
5883   parse_interfaces(stream,
5884                    _itfs_len,
5885                    cp,
5886                    &_has_nonstatic_concrete_methods,

5887                    CHECK);
5888 
5889   assert(_local_interfaces != NULL, "invariant");
5890 
5891   // Fields (offsets are filled in later)
5892   _fac = new FieldAllocationCount();
5893   parse_fields(stream,
5894                _access_flags.is_interface(),
5895                _fac,
5896                cp,
5897                cp_size,
5898                &_java_fields_count,
5899                CHECK);
5900 
5901   assert(_fields != NULL, "invariant");
5902 
5903   // Methods
5904   AccessFlags promoted_flags;
5905   parse_methods(stream,
5906                 _access_flags.is_interface(),


5907                 &promoted_flags,
5908                 &_has_final_method,
5909                 &_declares_nonstatic_concrete_methods,
5910                 CHECK);
5911 
5912   assert(_methods != NULL, "invariant");
5913 
5914   // promote flags from parse_methods() to the klass' flags
5915   _access_flags.add_promoted_flags(promoted_flags.as_int());
5916 
5917   if (_declares_nonstatic_concrete_methods) {
5918     _has_nonstatic_concrete_methods = true;
5919   }
5920 
5921   // Additional attributes/annotations
5922   _parsed_annotations = new ClassAnnotationCollector();
5923   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5924 
5925   assert(_inner_classes != NULL, "invariant");
5926 

5969   // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5970   // We have to update the resolved_klass_index and the name_index together
5971   // so extract the existing resolved_klass_index first.
5972   CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5973   int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5974   _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5975   assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5976          "Bad name_index");
5977 }
5978 
5979 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5980                                                  ConstantPool* cp,
5981                                                  TRAPS) {
5982   assert(stream != NULL, "invariant");
5983   assert(stream->at_eos(), "invariant");
5984   assert(cp != NULL, "invariant");
5985   assert(_loader_data != NULL, "invariant");
5986 
5987   if (_class_name == vmSymbols::java_lang_Object()) {
5988     check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5989                    "java.lang.Object cannot implement an interface in class file %s",
5990                    CHECK);
5991   }
5992   // We check super class after class file is parsed and format is checked
5993   if (_super_class_index > 0 && NULL == _super_klass) {
5994     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5995     if (_access_flags.is_interface()) {
5996       // Before attempting to resolve the superclass, check for class format
5997       // errors not checked yet.
5998       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5999         "Interfaces must have java.lang.Object as superclass in class file %s",
6000         CHECK);
6001     }
6002     Handle loader(THREAD, _loader_data->class_loader());
6003     _super_klass = (const InstanceKlass*)
6004                        SystemDictionary::resolve_super_or_fail(_class_name,
6005                                                                super_class_name,
6006                                                                loader,
6007                                                                _protection_domain,
6008                                                                true,
6009                                                                CHECK);
6010   }
6011 
6012   if (_super_klass != NULL) {









6013     if (_super_klass->has_nonstatic_concrete_methods()) {
6014       _has_nonstatic_concrete_methods = true;
6015     }




6016 
6017     if (_super_klass->is_interface()) {
6018       classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6019       return;



















































6020     }
6021   }

6022 
6023   // Compute the transitive list of all unique interfaces implemented by this class
6024   _transitive_interfaces =
6025     compute_transitive_interfaces(_super_klass,
6026                                   _local_interfaces,
6027                                   _loader_data,
6028                                   CHECK);
6029 
6030   assert(_transitive_interfaces != NULL, "invariant");
6031 
6032   // sort methods
6033   _method_ordering = sort_methods(_methods);
6034 
6035   _all_mirandas = new GrowableArray<Method*>(20);
6036 
6037   Handle loader(THREAD, _loader_data->class_loader());
6038   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6039                                                     &_num_miranda_methods,
6040                                                     _all_mirandas,
6041                                                     _super_klass,
6042                                                     _methods,
6043                                                     _access_flags,
6044                                                     _major_version,
6045                                                     loader,
6046                                                     _class_name,
6047                                                     _local_interfaces);
6048 
6049   // Size of Java itable (in words)
6050   _itable_size = _access_flags.is_interface() ? 0 :
6051     klassItable::compute_itable_size(_transitive_interfaces);
6052 
6053   assert(_fac != NULL, "invariant");
6054   assert(_parsed_annotations != NULL, "invariant");
6055 


























6056   _field_info = new FieldLayoutInfo();
6057   FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6058                         _parsed_annotations->is_contended(), _field_info);
6059   lb.build_layout();







6060 }
6061 
6062 void ClassFileParser::set_klass(InstanceKlass* klass) {
6063 
6064 #ifdef ASSERT
6065   if (klass != NULL) {
6066     assert(NULL == _klass, "leaking?");
6067   }
6068 #endif
6069 
6070   _klass = klass;
6071 }
6072 
6073 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6074 
6075 #ifdef ASSERT
6076   if (klass != NULL) {
6077     assert(NULL == _klass_to_deallocate, "leaking?");
6078   }
6079 #endif

   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classFileParser.hpp"
  27 #include "classfile/classFileStream.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderData.inline.hpp"
  30 #include "classfile/classLoadInfo.hpp"
  31 #include "classfile/defaultMethods.hpp"
  32 #include "classfile/fieldLayoutBuilder.hpp"
  33 #include "classfile/javaClasses.inline.hpp"
  34 #include "classfile/moduleEntry.hpp"
  35 #include "classfile/packageEntry.hpp"
  36 #include "classfile/symbolTable.hpp"
  37 #include "classfile/systemDictionary.hpp"
  38 #include "classfile/verificationType.hpp"
  39 #include "classfile/verifier.hpp"
  40 #include "classfile/vmClasses.hpp"
  41 #include "classfile/vmSymbols.hpp"
  42 #include "jvm.h"
  43 #include "logging/log.hpp"
  44 #include "logging/logStream.hpp"
  45 #include "memory/allocation.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/oopFactory.hpp"
  48 #include "memory/resourceArea.hpp"
  49 #include "memory/universe.hpp"
  50 #include "oops/annotations.hpp"
  51 #include "oops/constantPool.inline.hpp"
  52 #include "oops/fieldStreams.inline.hpp"
  53 #include "oops/inlineKlass.inline.hpp"
  54 #include "oops/instanceKlass.inline.hpp"
  55 #include "oops/instanceMirrorKlass.hpp"
  56 #include "oops/klass.inline.hpp"
  57 #include "oops/klassVtable.hpp"
  58 #include "oops/metadata.hpp"
  59 #include "oops/method.inline.hpp"
  60 #include "oops/oop.inline.hpp"
  61 #include "oops/recordComponent.hpp"
  62 #include "oops/symbol.hpp"
  63 #include "prims/jvmtiExport.hpp"
  64 #include "prims/jvmtiThreadState.hpp"
  65 #include "runtime/arguments.hpp"
  66 #include "runtime/fieldDescriptor.inline.hpp"
  67 #include "runtime/handles.inline.hpp"
  68 #include "runtime/javaCalls.hpp"
  69 #include "runtime/os.hpp"
  70 #include "runtime/perfData.hpp"
  71 #include "runtime/reflection.hpp"
  72 #include "runtime/safepointVerifiers.hpp"
  73 #include "runtime/signature.hpp"
  74 #include "runtime/timer.hpp"
  75 #include "services/classLoadingService.hpp"
  76 #include "services/threadService.hpp"
  77 #include "utilities/align.hpp"
  78 #include "utilities/bitMap.inline.hpp"
  79 #include "utilities/copy.hpp"
  80 #include "utilities/formatBuffer.hpp"
  81 #include "utilities/exceptions.hpp"
  82 #include "utilities/globalDefinitions.hpp"
  83 #include "utilities/growableArray.hpp"
  84 #include "utilities/macros.hpp"
  85 #include "utilities/ostream.hpp"
  86 #include "utilities/resourceHash.hpp"
  87 #include "utilities/stringUtils.hpp"
  88 #include "utilities/utf8.hpp"
  89 #if INCLUDE_CDS
  90 #include "classfile/systemDictionaryShared.hpp"
  91 #endif
  92 #if INCLUDE_JFR
  93 #include "jfr/support/jfrTraceIdExtension.hpp"
  94 #endif
  95 
  96 // We generally try to create the oops directly when parsing, rather than
  97 // allocating temporary data structures and copying the bytes twice. A
  98 // temporary area is only needed when parsing utf8 entries in the constant
  99 // pool and when parsing line number tables.
 100 
 101 // We add assert in debug mode when class format is not checked.
 102 
 103 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
 104 #define JAVA_MIN_SUPPORTED_VERSION        45
 105 #define JAVA_PREVIEW_MINOR_VERSION        65535
 106 
 107 // Used for two backward compatibility reasons:

 130 #define JAVA_12_VERSION                   56
 131 
 132 #define JAVA_13_VERSION                   57
 133 
 134 #define JAVA_14_VERSION                   58
 135 
 136 #define JAVA_15_VERSION                   59
 137 
 138 #define JAVA_16_VERSION                   60
 139 
 140 #define JAVA_17_VERSION                   61
 141 
 142 #define JAVA_18_VERSION                   62
 143 
 144 #define JAVA_19_VERSION                   63
 145 
 146 #define JAVA_20_VERSION                   64
 147 
 148 #define JAVA_21_VERSION                   65
 149 
 150 #define CONSTANT_CLASS_DESCRIPTORS        65
 151 
 152 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
 153   assert((bad_constant == JVM_CONSTANT_Module ||
 154           bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
 155          "Unexpected bad constant pool entry");
 156   if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
 157 }
 158 
 159 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 160                                                   ConstantPool* cp,
 161                                                   const int length,
 162                                                   TRAPS) {
 163   assert(stream != NULL, "invariant");
 164   assert(cp != NULL, "invariant");
 165 
 166   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 167   // this function (_current can be allocated in a register, with scalar
 168   // replacement of aggregates). The _current pointer is copied back to
 169   // stream() when this function returns. DON'T call another method within
 170   // this method that uses stream().
 171   const ClassFileStream cfs1 = *stream;
 172   const ClassFileStream* const cfs = &cfs1;
 173 
 174   debug_only(const u1* const old_current = stream->current();)
 175 
 176   // Used for batching symbol allocations.
 177   const char* names[SymbolTable::symbol_alloc_batch_size];
 178   int lengths[SymbolTable::symbol_alloc_batch_size];
 179   int indices[SymbolTable::symbol_alloc_batch_size];
 180   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 181   int names_count = 0;
 182 
 183   // parsing  Index 0 is unused
 184   for (int index = 1; index < length; index++) {
 185     // Each of the following case guarantees one more byte in the stream
 186     // for the following tag or the access_flags following constant pool,
 187     // so we don't need bounds-check for reading tag.
 188     const u1 tag = cfs->get_u1_fast();
 189     switch (tag) {
 190       case JVM_CONSTANT_Class: {
 191         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 192         const u2 name_index = cfs->get_u2_fast();
 193         cp->klass_index_at_put(index, name_index);
 194         break;
 195       }
 196       case JVM_CONSTANT_Fieldref: {
 197         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 198         const u2 class_index = cfs->get_u2_fast();
 199         const u2 name_and_type_index = cfs->get_u2_fast();
 200         cp->field_at_put(index, class_index, name_and_type_index);
 201         break;
 202       }
 203       case JVM_CONSTANT_Methodref: {
 204         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 205         const u2 class_index = cfs->get_u2_fast();
 206         const u2 name_and_type_index = cfs->get_u2_fast();
 207         cp->method_at_put(index, class_index, name_and_type_index);
 208         break;
 209       }
 210       case JVM_CONSTANT_InterfaceMethodref: {

 491         check_property(valid_symbol_at(name_ref_index),
 492           "Invalid constant pool index %u in class file %s",
 493           name_ref_index, CHECK);
 494         check_property(valid_symbol_at(signature_ref_index),
 495           "Invalid constant pool index %u in class file %s",
 496           signature_ref_index, CHECK);
 497         break;
 498       }
 499       case JVM_CONSTANT_Utf8:
 500         break;
 501       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 502       case JVM_CONSTANT_UnresolvedClassInError: {
 503         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 504         break;
 505       }
 506       case JVM_CONSTANT_ClassIndex: {
 507         const int class_index = cp->klass_index_at(index);
 508         check_property(valid_symbol_at(class_index),
 509           "Invalid constant pool index %u in class file %s",
 510           class_index, CHECK);
 511 
 512         Symbol* const name = cp->symbol_at(class_index);
 513         const unsigned int name_len = name->utf8_length();
 514         if (name->is_Q_signature()) {
 515           cp->unresolved_qdescriptor_at_put(index, class_index, num_klasses++);
 516         } else {
 517           cp->unresolved_klass_at_put(index, class_index, num_klasses++);
 518         }
 519         break;
 520       }
 521       case JVM_CONSTANT_StringIndex: {
 522         const int string_index = cp->string_index_at(index);
 523         check_property(valid_symbol_at(string_index),
 524           "Invalid constant pool index %u in class file %s",
 525           string_index, CHECK);
 526         Symbol* const sym = cp->symbol_at(string_index);
 527         cp->unresolved_string_at_put(index, sym);
 528         break;
 529       }
 530       case JVM_CONSTANT_MethodHandle: {
 531         const int ref_index = cp->method_handle_index_at(index);
 532         check_property(valid_cp_range(ref_index, length),
 533           "Invalid constant pool index %u in class file %s",
 534           ref_index, CHECK);
 535         const constantTag tag = cp->tag_at(ref_index);
 536         const int ref_kind = cp->method_handle_ref_kind_at(index);
 537 
 538         switch (ref_kind) {

 698           cp->signature_ref_index_at(name_and_type_ref_index);
 699         const Symbol* const name = cp->symbol_at(name_ref_index);
 700         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 701         if (tag == JVM_CONSTANT_Fieldref) {
 702           if (_need_verify) {
 703             // Field name and signature are verified above, when iterating NameAndType_info.
 704             // Need only to be sure signature is non-zero length and the right type.
 705             if (Signature::is_method(signature)) {
 706               throwIllegalSignature("Field", name, signature, CHECK);
 707             }
 708           }
 709         } else {
 710           if (_need_verify) {
 711             // Method name and signature are individually verified above, when iterating
 712             // NameAndType_info.  Need to check here that signature is non-zero length and
 713             // the right type.
 714             if (!Signature::is_method(signature)) {
 715               throwIllegalSignature("Method", name, signature, CHECK);
 716             }
 717           }
 718           // If a class method name begins with '<', it must be "<init>" and have void signature,
 719           // or if it is an inline type, <vnew> with return.
 720           const unsigned int name_len = name->utf8_length();
 721           if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
 722               name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
 723             if (name != vmSymbols::object_initializer_name() &&
 724                 name != vmSymbols::inline_factory_name()) {
 725               classfile_parse_error(
 726                 "Bad method name at constant pool index %u in class file %s",
 727                 name_ref_index, THREAD);
 728               return;
 729             } else if (!Signature::is_void_method(signature)) {
 730               // if return type is non-void then it must be an inline type
 731               if (name == vmSymbols::object_initializer_name() ||
 732                   !EnableValhalla || !supports_inline_types() ||
 733                   !signature->ends_with(JVM_SIGNATURE_ENDCLASS)) {
 734                 throwIllegalSignature("Method", name, signature, CHECK);
 735               }
 736             }
 737           }
 738         }
 739         break;
 740       }
 741       case JVM_CONSTANT_MethodHandle: {
 742         const int ref_index = cp->method_handle_index_at(index);
 743         const int ref_kind = cp->method_handle_ref_kind_at(index);
 744         switch (ref_kind) {
 745           case JVM_REF_invokeVirtual:
 746           case JVM_REF_invokeStatic:
 747           case JVM_REF_invokeSpecial:
 748           case JVM_REF_newInvokeSpecial: {
 749             const int name_and_type_ref_index =
 750               cp->name_and_type_ref_index_at(ref_index);
 751             const int name_ref_index =
 752               cp->name_ref_index_at(name_and_type_ref_index);
 753             const Symbol* const name = cp->symbol_at(name_ref_index);
 754 
 755             if (EnableValhalla && supports_inline_types() && name == vmSymbols::inline_factory_name()) { // <vnew>
 756               // <vnew> factory methods must be non-void return and invokeStatic.
 757               const int signature_ref_index =
 758                 cp->signature_ref_index_at(name_and_type_ref_index);
 759               const Symbol* const signature = cp->symbol_at(signature_ref_index);
 760               if (signature->is_void_method_signature() || ref_kind != JVM_REF_invokeStatic) {
 761                 classfile_parse_error(
 762                   "Bad factory method name at constant pool index %u in class file %s",
 763                   name_ref_index, CHECK);
 764               }
 765             } else if (name != vmSymbols::object_initializer_name()) { // !<init>
 766               if (ref_kind == JVM_REF_newInvokeSpecial) {
 767                 classfile_parse_error(
 768                   "Bad constructor name at constant pool index %u in class file %s",
 769                     name_ref_index, THREAD);
 770                 return;
 771               }
 772             } else { // <init>
 773               // The allowed invocation mode of <init> depends on its signature.
 774               // This test corresponds to verify_invoke_instructions in the verifier.
 775               const int signature_ref_index =
 776                 cp->signature_ref_index_at(name_and_type_ref_index);
 777               const Symbol* const signature = cp->symbol_at(signature_ref_index);
 778               if (signature->is_void_method_signature()
 779                   && ref_kind == JVM_REF_newInvokeSpecial) {
 780                 // OK, could be a constructor call
 781               } else {
 782                 classfile_parse_error(
 783                   "Bad method name at constant pool index %u in class file %s",
 784                   name_ref_index, THREAD);
 785                 return;
 786               }
 787             }
 788             break;
 789           }
 790           // Other ref_kinds are already fully checked in previous pass.
 791         } // switch(ref_kind)
 792         break;
 793       }
 794       case JVM_CONSTANT_MethodType: {
 795         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 796         const Symbol* const signature = cp->method_type_signature_at(index);
 797         verify_legal_method_signature(no_name, signature, CHECK);
 798         break;
 799       }
 800       case JVM_CONSTANT_Utf8: {
 801         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");

 838   NameSigHash* entry = table[index];
 839   while (entry != NULL) {
 840     if (entry->_name == name && entry->_sig == sig) {
 841       return false;
 842     }
 843     entry = entry->_next;
 844   }
 845 
 846   // No duplicate is found, allocate a new entry and fill it.
 847   entry = new NameSigHash();
 848   entry->_name = name;
 849   entry->_sig = sig;
 850 
 851   // Insert into hash table
 852   entry->_next = table[index];
 853   table[index] = entry;
 854 
 855   return true;
 856 }
 857 
 858 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
 859   assert(super_type != NULL,"Method doesn't support null super type");
 860   if (super_type->carries_identity_modifier()) {
 861     if (current->carries_value_modifier()) {
 862         ResourceMark rm(THREAD);
 863         Exceptions::fthrow(
 864           THREAD_AND_LOCATION,
 865           vmSymbols::java_lang_IncompatibleClassChangeError(),
 866           "Value type %s has an identity type as supertype",
 867           current->class_name()->as_klass_external_name());
 868         return;
 869       }
 870     current->set_carries_identity_modifier();
 871   }
 872   if (super_type->carries_value_modifier()) {
 873     if (current->carries_identity_modifier()) {
 874       ResourceMark rm(THREAD);
 875       Exceptions::fthrow(
 876         THREAD_AND_LOCATION,
 877         vmSymbols::java_lang_IncompatibleClassChangeError(),
 878         "Identity type %s has a value type as supertype",
 879         current->class_name()->as_klass_external_name());
 880       return;
 881     }
 882     current->set_carries_value_modifier();
 883   }
 884 }
 885 
 886 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
 887                                        int itfs_len,
 888                                        ConstantPool* cp,
 889                                        bool* const has_nonstatic_concrete_methods,
 890                                        // FIXME: lots of these functions
 891                                        // declare their parameters as const,
 892                                        // which adds only noise to the code.
 893                                        // Remove the spurious const modifiers.
 894                                        // Many are of the form "const int x"
 895                                        // or "T* const x".
 896                                        bool* const is_declared_atomic,
 897                                        TRAPS) {
 898   assert(stream != NULL, "invariant");
 899   assert(cp != NULL, "invariant");
 900   assert(has_nonstatic_concrete_methods != NULL, "invariant");
 901 
 902   if (itfs_len == 0) {
 903     _local_interfaces = Universe::the_empty_instance_klass_array();
 904 
 905   } else {
 906     assert(itfs_len > 0, "only called for len>0");
 907     _local_interface_indexes = new GrowableArray<u2>(itfs_len);
 908     int index = 0;

 909     for (index = 0; index < itfs_len; index++) {
 910       const u2 interface_index = stream->get_u2(CHECK);

 911       check_property(
 912         valid_klass_reference_at(interface_index),
 913         "Interface name has bad constant pool index %u in class file %s",
 914         interface_index, CHECK);
 915       _local_interface_indexes->at_put_grow(index, interface_index);































 916     }
 917 
 918     if (!_need_verify || itfs_len <= 1) {
 919       return;
 920     }
 921 
 922     // Check if there's any duplicates in interfaces
 923     ResourceMark rm(THREAD);
 924     NameSigHash** interface_names = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
 925                                                                  NameSigHash*,
 926                                                                  HASH_ROW_SIZE);
 927     initialize_hashtable(interface_names);
 928     bool dup = false;
 929     const Symbol* name = NULL;
 930     {
 931       debug_only(NoSafepointVerifier nsv;)
 932       for (index = 0; index < itfs_len; index++) {
 933         name = cp->klass_name_at(_local_interface_indexes->at(index));

 934         // If no duplicates, add (name, NULL) in hashtable interface_names.
 935         if (!put_after_lookup(name, NULL, interface_names)) {
 936           dup = true;
 937           break;
 938         }
 939       }
 940     }
 941     if (dup) {
 942       classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
 943                              name->as_C_string(), THREAD);
 944     }
 945   }
 946 }
 947 
 948 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 949                                            int constantvalue_index,
 950                                            int signature_index,
 951                                            TRAPS) const {
 952   // Make sure the constant pool entry is of a type appropriate to this field
 953   guarantee_property(

1399                                             CHECK);
1400   parsed_annotations->set_field_annotations(a);
1401   a = assemble_annotations(runtime_visible_type_annotations,
1402                            runtime_visible_type_annotations_length,
1403                            runtime_invisible_type_annotations,
1404                            runtime_invisible_type_annotations_length,
1405                            CHECK);
1406   parsed_annotations->set_field_type_annotations(a);
1407   return;
1408 }
1409 
1410 
1411 // Field allocation types. Used for computing field offsets.
1412 
1413 enum FieldAllocationType {
1414   STATIC_OOP,           // Oops
1415   STATIC_BYTE,          // Boolean, Byte, char
1416   STATIC_SHORT,         // shorts
1417   STATIC_WORD,          // ints
1418   STATIC_DOUBLE,        // aligned long or double
1419   STATIC_INLINE,        // inline type field
1420   NONSTATIC_OOP,
1421   NONSTATIC_BYTE,
1422   NONSTATIC_SHORT,
1423   NONSTATIC_WORD,
1424   NONSTATIC_DOUBLE,
1425   NONSTATIC_INLINE,
1426   MAX_FIELD_ALLOCATION_TYPE,
1427   BAD_ALLOCATION_TYPE = -1
1428 };
1429 
1430 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1431   BAD_ALLOCATION_TYPE, // 0
1432   BAD_ALLOCATION_TYPE, // 1
1433   BAD_ALLOCATION_TYPE, // 2
1434   BAD_ALLOCATION_TYPE, // 3
1435   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1436   NONSTATIC_SHORT,     // T_CHAR        =  5,
1437   NONSTATIC_WORD,      // T_FLOAT       =  6,
1438   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1439   NONSTATIC_BYTE,      // T_BYTE        =  8,
1440   NONSTATIC_SHORT,     // T_SHORT       =  9,
1441   NONSTATIC_WORD,      // T_INT         = 10,
1442   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1443   NONSTATIC_OOP,       // T_OBJECT      = 12,
1444   NONSTATIC_OOP,       // T_ARRAY       = 13,
1445   NONSTATIC_OOP,       // T_PRIMITIVE_OBJECT = 14,
1446   BAD_ALLOCATION_TYPE, // T_VOID        = 15,
1447   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 16,
1448   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 17,
1449   BAD_ALLOCATION_TYPE, // T_METADATA    = 18,
1450   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1451   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 20,
1452   BAD_ALLOCATION_TYPE, // 0
1453   BAD_ALLOCATION_TYPE, // 1
1454   BAD_ALLOCATION_TYPE, // 2
1455   BAD_ALLOCATION_TYPE, // 3
1456   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1457   STATIC_SHORT,        // T_CHAR        =  5,
1458   STATIC_WORD,         // T_FLOAT       =  6,
1459   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1460   STATIC_BYTE,         // T_BYTE        =  8,
1461   STATIC_SHORT,        // T_SHORT       =  9,
1462   STATIC_WORD,         // T_INT         = 10,
1463   STATIC_DOUBLE,       // T_LONG        = 11,
1464   STATIC_OOP,          // T_OBJECT      = 12,
1465   STATIC_OOP,          // T_ARRAY       = 13,
1466   STATIC_OOP,          // T_PRIMITIVE_OBJECT = 14,
1467   BAD_ALLOCATION_TYPE, // T_VOID        = 15,
1468   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 16,
1469   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 17,
1470   BAD_ALLOCATION_TYPE, // T_METADATA    = 18,
1471   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 19,
1472   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 20
1473 };
1474 
1475 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type, bool is_inline_type) {
1476   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1477   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1478   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1479   if (is_inline_type) {
1480     result = is_static ? STATIC_INLINE : NONSTATIC_INLINE;
1481   }
1482   return result;
1483 }
1484 
1485 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1486  public:
1487   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1488 
1489   FieldAllocationCount() {
1490     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1491       count[i] = 0;
1492     }
1493   }
1494 
1495   void update(bool is_static, BasicType type, bool is_inline_type) {
1496     FieldAllocationType atype = basic_type_to_atype(is_static, type, is_inline_type);
1497     if (atype != BAD_ALLOCATION_TYPE) {
1498       // Make sure there is no overflow with injected fields.
1499       assert(count[atype] < 0xFFFF, "More than 65535 fields");
1500       count[atype]++;
1501     }
1502   }
1503 };
1504 
1505 // Side-effects: populates the _fields, _fields_annotations,
1506 // _fields_type_annotations fields
1507 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1508                                    AccessFlags class_access_flags,
1509                                    FieldAllocationCount* const fac,
1510                                    ConstantPool* cp,
1511                                    const int cp_size,
1512                                    u2* const java_fields_count_ptr,
1513                                    TRAPS) {
1514 
1515   assert(cfs != NULL, "invariant");
1516   assert(fac != NULL, "invariant");
1517   assert(cp != NULL, "invariant");
1518   assert(java_fields_count_ptr != NULL, "invariant");
1519 
1520   assert(NULL == _fields, "invariant");
1521   assert(NULL == _fields_annotations, "invariant");
1522   assert(NULL == _fields_type_annotations, "invariant");
1523 
1524   bool is_inline_type = class_access_flags.is_value_class() && !class_access_flags.is_abstract();
1525   cfs->guarantee_more(2, CHECK);  // length
1526   const u2 length = cfs->get_u2_fast();
1527   *java_fields_count_ptr = length;
1528 
1529   int num_injected = 0;
1530   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1531                                                                   &num_injected);
1532 
1533   // two more slots are required for inline classes:
1534   // one for the static field with a reference to the pre-allocated default value
1535   // one for the field the JVM injects when detecting an empty inline class
1536   const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1537 
1538   // The field array starts with tuples of shorts
1539   // [access, name index, sig index, initial value index, byte offset].
1540   // A generic signature slot only exists for field with generic
1541   // signature attribute. And the access flag is set with
1542   // JVM_ACC_FIELD_HAS_GENERIC_SIGNATURE for that field. The generic
1543   // signature slots are at the end of the field array and after all
1544   // other fields data.
1545   //
1546   //   f1: [access, name index, sig index, initial value index, low_offset, high_offset]
1547   //   f2: [access, name index, sig index, initial value index, low_offset, high_offset]
1548   //       ...
1549   //   fn: [access, name index, sig index, initial value index, low_offset, high_offset]
1550   //       [generic signature index]
1551   //       [generic signature index]
1552   //       ...
1553   //
1554   // Allocate a temporary resource array for field data. For each field,
1555   // a slot is reserved in the temporary array for the generic signature
1556   // index. After parsing all fields, the data are copied to a permanent
1557   // array and any unused slots will be discarded.
1558   ResourceMark rm(THREAD);
1559   u2* const fa = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD,
1560                                               u2,
1561                                               total_fields * (FieldInfo::field_slots + 1));
1562 
1563   // The generic signature slots start after all other fields' data.
1564   int generic_signature_slot = total_fields * FieldInfo::field_slots;
1565   int num_generic_signature = 0;
1566   int instance_fields_count = 0;
1567   for (int n = 0; n < length; n++) {
1568     // access_flags, name_index, descriptor_index, attributes_count
1569     cfs->guarantee_more(8, CHECK);
1570 
1571     jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1572 
1573     const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1574     verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1575     AccessFlags access_flags;


1576     access_flags.set_flags(flags);
1577 
1578     const u2 name_index = cfs->get_u2_fast();
1579     check_property(valid_symbol_at(name_index),
1580       "Invalid constant pool index %u for field name in class file %s",
1581       name_index, CHECK);
1582     const Symbol* const name = cp->symbol_at(name_index);
1583     verify_legal_field_name(name, CHECK);
1584 
1585     const u2 signature_index = cfs->get_u2_fast();
1586     check_property(valid_symbol_at(signature_index),
1587       "Invalid constant pool index %u for field signature in class file %s",
1588       signature_index, CHECK);
1589     const Symbol* const sig = cp->symbol_at(signature_index);
1590     verify_legal_field_signature(name, sig, CHECK);
1591     if (!access_flags.is_static()) instance_fields_count++;
1592 
1593     u2 constantvalue_index = 0;
1594     bool is_synthetic = false;
1595     u2 generic_signature_index = 0;
1596     const bool is_static = access_flags.is_static();
1597     FieldAnnotationCollector parsed_annotations(_loader_data);
1598 
1599     const u2 attributes_count = cfs->get_u2_fast();
1600     if (attributes_count > 0) {
1601       parse_field_attributes(cfs,
1602                              attributes_count,
1603                              is_static,
1604                              signature_index,
1605                              &constantvalue_index,
1606                              &is_synthetic,
1607                              &generic_signature_index,
1608                              &parsed_annotations,
1609                              CHECK);
1610 
1611       if (parsed_annotations.field_annotations() != NULL) {

1631 
1632       if (is_synthetic) {
1633         access_flags.set_is_synthetic();
1634       }
1635       if (generic_signature_index != 0) {
1636         access_flags.set_field_has_generic_signature();
1637         fa[generic_signature_slot] = generic_signature_index;
1638         generic_signature_slot ++;
1639         num_generic_signature ++;
1640       }
1641     }
1642 
1643     FieldInfo* const field = FieldInfo::from_field_array(fa, n);
1644     field->initialize(access_flags.as_short(),
1645                       name_index,
1646                       signature_index,
1647                       constantvalue_index);
1648     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1649 
1650     // Update FieldAllocationCount for this kind of field
1651     fac->update(is_static, type, type == T_PRIMITIVE_OBJECT);
1652 
1653     // After field is initialized with type, we can augment it with aux info
1654     if (parsed_annotations.has_any_annotations()) {
1655       parsed_annotations.apply_to(field);
1656       if (field->is_contended()) {
1657         _has_contended_fields = true;
1658       }
1659     }
1660   }
1661 
1662   int index = length;
1663   if (num_injected != 0) {
1664     for (int n = 0; n < num_injected; n++) {
1665       // Check for duplicates
1666       if (injected[n].may_be_java) {
1667         const Symbol* const name      = injected[n].name();
1668         const Symbol* const signature = injected[n].signature();
1669         bool duplicate = false;
1670         for (int i = 0; i < length; i++) {
1671           const FieldInfo* const f = FieldInfo::from_field_array(fa, i);

1675             duplicate = true;
1676             break;
1677           }
1678         }
1679         if (duplicate) {
1680           // These will be removed from the field array at the end
1681           continue;
1682         }
1683       }
1684 
1685       // Injected field
1686       FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1687       field->initialize((u2)JVM_ACC_FIELD_INTERNAL,
1688                         (u2)(injected[n].name_index),
1689                         (u2)(injected[n].signature_index),
1690                         0);
1691 
1692       const BasicType type = Signature::basic_type(injected[n].signature());
1693 
1694       // Update FieldAllocationCount for this kind of field
1695       fac->update(false, type, false);
1696       index++;
1697     }
1698   }
1699 
1700   if (is_inline_type) {
1701     FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1702     field->initialize(JVM_ACC_FIELD_INTERNAL | JVM_ACC_STATIC,
1703                       (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1704                       (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1705                       0);
1706     const BasicType type = Signature::basic_type(vmSymbols::object_signature());
1707     fac->update(true, type, false);
1708     index++;
1709   }
1710 
1711   if (is_inline_type && instance_fields_count == 0) {
1712     _is_empty_inline_type = true;
1713     FieldInfo* const field = FieldInfo::from_field_array(fa, index);
1714     field->initialize(JVM_ACC_FIELD_INTERNAL,
1715         (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(empty_marker_name)),
1716         (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(byte_signature)),
1717         0);
1718     const BasicType type = Signature::basic_type(vmSymbols::byte_signature());
1719     fac->update(false, type, false);
1720     index++;
1721   }
1722 
1723   if (instance_fields_count > 0) {
1724     _has_nonstatic_fields = true;
1725   }
1726 
1727   assert(NULL == _fields, "invariant");
1728 
1729   _fields =
1730     MetadataFactory::new_array<u2>(_loader_data,
1731                                    index * FieldInfo::field_slots + num_generic_signature,
1732                                    CHECK);
1733   // Sometimes injected fields already exist in the Java source so
1734   // the fields array could be too long.  In that case the
1735   // fields array is trimmed. Also unused slots that were reserved
1736   // for generic signature indexes are discarded.
1737   {
1738     int i = 0;
1739     for (; i < index * FieldInfo::field_slots; i++) {
1740       _fields->at_put(i, fa[i]);
1741     }
1742     for (int j = total_fields * FieldInfo::field_slots;
1743          j < generic_signature_slot; j++) {
1744       _fields->at_put(i++, fa[j]);
1745     }
1746     assert(_fields->length() == i, "");

2024         "Exception name has bad type at constant pool %u in class file %s",
2025         checked_exception, CHECK_NULL);
2026     }
2027   }
2028   // check exceptions attribute length
2029   if (_need_verify) {
2030     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
2031                                                    sizeof(u2) * size),
2032                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
2033   }
2034   return checked_exceptions_start;
2035 }
2036 
2037 void ClassFileParser::throwIllegalSignature(const char* type,
2038                                             const Symbol* name,
2039                                             const Symbol* sig,
2040                                             TRAPS) const {
2041   assert(name != NULL, "invariant");
2042   assert(sig != NULL, "invariant");
2043 
2044   const char* class_note = "";
2045   if (is_inline_type() && name == vmSymbols::object_initializer_name()) {
2046     class_note = " (an inline class)";
2047   }
2048 
2049   ResourceMark rm(THREAD);
2050   Exceptions::fthrow(THREAD_AND_LOCATION,
2051       vmSymbols::java_lang_ClassFormatError(),
2052       "%s \"%s\" in class %s%s has illegal signature \"%s\"", type,
2053       name->as_C_string(), _class_name->as_C_string(), class_note, sig->as_C_string());
2054 }
2055 
2056 AnnotationCollector::ID
2057 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
2058                                       const Symbol* name,
2059                                       const bool can_access_vm_annotations) {
2060   const vmSymbolID sid = vmSymbols::find_sid(name);
2061   // Privileged code can use all annotations.  Other code silently drops some.
2062   const bool privileged = loader_data->is_boot_class_loader_data() ||
2063                           loader_data->is_platform_class_loader_data() ||
2064                           can_access_vm_annotations;
2065   switch (sid) {
2066     case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
2067       if (_location != _in_method)  break;  // only allow for methods
2068       if (!privileged)              break;  // only allow in privileged code
2069       return _method_CallerSensitive;
2070     }
2071     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
2072       if (_location != _in_method)  break;  // only allow for methods
2073       if (!privileged)              break;  // only allow in privileged code

2336                              runtime_visible_type_annotations_length,
2337                              runtime_invisible_type_annotations,
2338                              runtime_invisible_type_annotations_length,
2339                              CHECK);
2340     cm->set_type_annotations(a);
2341   }
2342 }
2343 
2344 
2345 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2346 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2347 // Method* to save footprint, so we only know the size of the resulting Method* when the
2348 // entire method attribute is parsed.
2349 //
2350 // The promoted_flags parameter is used to pass relevant access_flags
2351 // from the method back up to the containing klass. These flag values
2352 // are added to klass's access_flags.
2353 
2354 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2355                                       bool is_interface,
2356                                       bool is_value_class,
2357                                       bool is_abstract_class,
2358                                       const ConstantPool* cp,
2359                                       AccessFlags* const promoted_flags,
2360                                       TRAPS) {
2361   assert(cfs != NULL, "invariant");
2362   assert(cp != NULL, "invariant");
2363   assert(promoted_flags != NULL, "invariant");
2364 
2365   ResourceMark rm(THREAD);
2366   // Parse fixed parts:
2367   // access_flags, name_index, descriptor_index, attributes_count
2368   cfs->guarantee_more(8, CHECK_NULL);
2369 
2370   int flags = cfs->get_u2_fast();
2371   const u2 name_index = cfs->get_u2_fast();
2372   const int cp_size = cp->length();
2373   check_property(
2374     valid_symbol_at(name_index),
2375     "Illegal constant pool index %u for method name in class file %s",
2376     name_index, CHECK_NULL);
2377   const Symbol* const name = cp->symbol_at(name_index);

2379 
2380   const u2 signature_index = cfs->get_u2_fast();
2381   guarantee_property(
2382     valid_symbol_at(signature_index),
2383     "Illegal constant pool index %u for method signature in class file %s",
2384     signature_index, CHECK_NULL);
2385   const Symbol* const signature = cp->symbol_at(signature_index);
2386 
2387   if (name == vmSymbols::class_initializer_name()) {
2388     // We ignore the other access flags for a valid class initializer.
2389     // (JVM Spec 2nd ed., chapter 4.6)
2390     if (_major_version < 51) { // backward compatibility
2391       flags = JVM_ACC_STATIC;
2392     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2393       flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2394     } else {
2395       classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2396       return NULL;
2397     }
2398   } else {
2399     verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2400   }
2401 
2402   if (EnableValhalla && supports_inline_types() && name == vmSymbols::inline_factory_name()) {
2403     if (is_interface) {
2404       classfile_parse_error("Interface cannot have a method named <vnew>, class file %s", CHECK_NULL);
2405     } else if (!is_value_class) {
2406        classfile_parse_error("Identity class cannot have a method <vnew>, class file %s", CHECK_NULL);
2407     } else if (signature->is_void_method_signature()) {
2408        classfile_parse_error("Factory method <vnew> must have a non-void return type, class file %s", CHECK_NULL);
2409     } else { // also OK, a static factory, as long as the return value is good
2410       bool ok = false;
2411       SignatureStream ss((Symbol*) signature, true);
2412       while (!ss.at_return_type())  ss.next();
2413       if (ss.is_reference()) {
2414         Symbol* ret = ss.as_symbol();
2415         const Symbol* required = class_name();
2416         if (is_hidden()) {
2417           // The original class name for hidden classes changed.
2418           /// So using the original name in the return type is no longer valid.
2419           required = vmSymbols::java_lang_Object();
2420         }
2421         ok = (ret == required);
2422       }
2423       if (!ok) {
2424         throwIllegalSignature("Method", name, signature, CHECK_0);
2425       }
2426       // factory method, with a non-void return.  No other
2427       // definition of <vnew> is possible.
2428       //
2429       // The verifier (in verify_invoke_instructions) will inspect the
2430       // signature of any attempt to invoke <vnew>, and ensure that it
2431       // returns non-void.
2432     }
2433   }
2434 
2435   if (name == vmSymbols::object_initializer_name()) {
2436     if (is_interface) {
2437       classfile_parse_error("Interface cannot have a method named <init>, class file %s", CHECK_NULL);
2438     } else if ((!is_value_class || is_abstract_class) && signature->is_void_method_signature()) {
2439       // OK, a constructor
2440     } else {
2441       // not OK, so throw the same error as in verify_legal_method_signature.
2442       throwIllegalSignature("Method", name, signature, CHECK_0);
2443     }
2444     // A declared <init> method must always be a non-static
2445     // object constructor, with a void return.
2446     //
2447     // The verifier (in verify_invoke_instructions) will inspect the
2448     // signature of any attempt to invoke <init>, and ensure that it
2449     // returns void.
2450   }
2451 
2452   if (EnableValhalla) {
2453     if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2454         && ((flags & JVM_ACC_STATIC) == 0 )
2455         && !carries_identity_modifier()) {
2456       classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2457         return NULL;
2458     }
2459   }
2460 
2461   int args_size = -1;  // only used when _need_verify is true
2462   if (_need_verify) {
2463     verify_legal_name_with_signature(name, signature, CHECK_NULL);
2464     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2465                  verify_legal_method_signature(name, signature, CHECK_NULL);
2466     if (args_size > MAX_ARGS_SIZE) {
2467       classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2468       return NULL;
2469     }
2470   }
2471 
2472   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2473 
2474   // Default values for code and exceptions attribute elements
2475   u2 max_stack = 0;
2476   u2 max_locals = 0;
2477   u4 code_length = 0;
2478   const u1* code_start = 0;

3008       _has_finalizer = true;
3009     }
3010   }
3011   if (name == vmSymbols::object_initializer_name() &&
3012       signature == vmSymbols::void_method_signature() &&
3013       m->is_vanilla_constructor()) {
3014     _has_vanilla_constructor = true;
3015   }
3016 
3017   NOT_PRODUCT(m->verify());
3018   return m;
3019 }
3020 
3021 
3022 // The promoted_flags parameter is used to pass relevant access_flags
3023 // from the methods back up to the containing klass. These flag values
3024 // are added to klass's access_flags.
3025 // Side-effects: populates the _methods field in the parser
3026 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
3027                                     bool is_interface,
3028                                     bool is_value_class,
3029                                     bool is_abstract_type,
3030                                     AccessFlags* promoted_flags,
3031                                     bool* has_final_method,
3032                                     bool* declares_nonstatic_concrete_methods,
3033                                     TRAPS) {
3034   assert(cfs != NULL, "invariant");
3035   assert(promoted_flags != NULL, "invariant");
3036   assert(has_final_method != NULL, "invariant");
3037   assert(declares_nonstatic_concrete_methods != NULL, "invariant");
3038 
3039   assert(NULL == _methods, "invariant");
3040 
3041   cfs->guarantee_more(2, CHECK);  // length
3042   const u2 length = cfs->get_u2_fast();
3043   if (length == 0) {
3044     _methods = Universe::the_empty_method_array();
3045   } else {
3046     _methods = MetadataFactory::new_array<Method*>(_loader_data,
3047                                                    length,
3048                                                    NULL,
3049                                                    CHECK);
3050 
3051     for (int index = 0; index < length; index++) {
3052       Method* method = parse_method(cfs,
3053                                     is_interface,
3054                                     is_value_class,
3055                                     is_abstract_type,
3056                                     _cp,
3057                                     promoted_flags,
3058                                     CHECK);
3059 
3060       if (method->is_final()) {
3061         *has_final_method = true;
3062       }
3063       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
3064       // used for interface initialization, and default method inheritance analysis
3065       if (is_interface && !(*declares_nonstatic_concrete_methods)
3066         && !method->is_abstract() && !method->is_static()) {
3067         *declares_nonstatic_concrete_methods = true;
3068       }
3069       _methods->at_put(index, method);
3070     }
3071 
3072     if (_need_verify && length > 1) {
3073       // Check duplicated methods
3074       ResourceMark rm(THREAD);
3075       NameSigHash** names_and_sigs = NEW_RESOURCE_ARRAY_IN_THREAD(

3312         valid_klass_reference_at(outer_class_info_index),
3313       "outer_class_info_index %u has bad constant type in class file %s",
3314       outer_class_info_index, CHECK_0);
3315 
3316     if (outer_class_info_index != 0) {
3317       const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3318       char* bytes = (char*)outer_class_name->bytes();
3319       guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3320                          "Outer class is an array class in class file %s", CHECK_0);
3321     }
3322     // Inner class name
3323     const u2 inner_name_index = cfs->get_u2_fast();
3324     check_property(
3325       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3326       "inner_name_index %u has bad constant type in class file %s",
3327       inner_name_index, CHECK_0);
3328     if (_need_verify) {
3329       guarantee_property(inner_class_info_index != outer_class_info_index,
3330                          "Class is both outer and inner class in class file %s", CHECK_0);
3331     }
3332 
3333     jint recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3334     // JVM_ACC_MODULE is defined in JDK-9 and later.
3335     if (_major_version >= JAVA_9_VERSION) {
3336       recognized_modifiers |= JVM_ACC_MODULE;


3337     }
3338     if (supports_inline_types()) {
3339       recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE | JVM_ACC_IDENTITY;
3340     }
3341 
3342     // Access flags
3343     jint flags = cfs->get_u2_fast() & recognized_modifiers;
3344 
3345     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3346       // Set abstract bit for old class files for backward compatibility
3347       flags |= JVM_ACC_ABSTRACT;
3348     }
3349 
3350     if (EnableValhalla) {
3351       if (!supports_inline_types()) {
3352         const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3353         const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3354         if (!is_module && !is_interface) {
3355           flags |= JVM_ACC_IDENTITY;
3356         }
3357       }
3358     }
3359 
3360     const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3361     verify_legal_class_modifiers(flags, name, false, CHECK_0);
3362     AccessFlags inner_access_flags(flags);
3363 
3364     inner_classes->at_put(index++, inner_class_info_index);
3365     inner_classes->at_put(index++, outer_class_info_index);
3366     inner_classes->at_put(index++, inner_name_index);
3367     inner_classes->at_put(index++, inner_access_flags.as_short());
3368   }
3369 
3370   // Check for circular and duplicate entries.
3371   bool has_circularity = false;
3372   if (_need_verify) {
3373     has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3374     if (has_circularity) {
3375       // If circularity check failed then ignore InnerClasses attribute.
3376       MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3377       index = 0;
3378       if (parsed_enclosingmethod_attribute) {
3379         inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3380         _inner_classes = inner_classes;
3381       } else {

3445   if (length > 0) {
3446     int index = 0;
3447     cfs->guarantee_more(2 * length, CHECK_0);
3448     for (int n = 0; n < length; n++) {
3449       const u2 class_info_index = cfs->get_u2_fast();
3450       check_property(
3451         valid_klass_reference_at(class_info_index),
3452         "Permitted subclass class_info_index %u has bad constant type in class file %s",
3453         class_info_index, CHECK_0);
3454       permitted_subclasses->at_put(index++, class_info_index);
3455     }
3456     assert(index == size, "wrong size");
3457   }
3458 
3459   // Restore buffer's current position.
3460   cfs->set_current(current_mark);
3461 
3462   return length;
3463 }
3464 
3465 u2 ClassFileParser::parse_classfile_preload_attribute(const ClassFileStream* const cfs,
3466                                                                    const u1* const preload_attribute_start,
3467                                                                    TRAPS) {
3468   const u1* const current_mark = cfs->current();
3469   u2 length = 0;
3470   if (preload_attribute_start != NULL) {
3471     cfs->set_current(preload_attribute_start);
3472     cfs->guarantee_more(2, CHECK_0);  // length
3473     length = cfs->get_u2_fast();
3474   }
3475   const int size = length;
3476   Array<u2>* const preload_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3477   _preload_classes = preload_classes;
3478   if (length > 0) {
3479     int index = 0;
3480     cfs->guarantee_more(2 * length, CHECK_0);
3481     for (int n = 0; n < length; n++) {
3482       const u2 class_info_index = cfs->get_u2_fast();
3483       check_property(
3484         valid_klass_reference_at(class_info_index),
3485         "Preload class_info_index %u has bad constant type in class file %s",
3486         class_info_index, CHECK_0);
3487       preload_classes->at_put(index++, class_info_index);
3488     }
3489     assert(index == size, "wrong size");
3490   }
3491 
3492   // Restore buffer's current position.
3493   cfs->set_current(current_mark);
3494 
3495   return length;
3496 }
3497 
3498 //  Record {
3499 //    u2 attribute_name_index;
3500 //    u4 attribute_length;
3501 //    u2 components_count;
3502 //    component_info components[components_count];
3503 //  }
3504 //  component_info {
3505 //    u2 name_index;
3506 //    u2 descriptor_index
3507 //    u2 attributes_count;
3508 //    attribute_info_attributes[attributes_count];
3509 //  }
3510 u2 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3511                                                      const ConstantPool* cp,
3512                                                      const u1* const record_attribute_start,
3513                                                      TRAPS) {
3514   const u1* const current_mark = cfs->current();
3515   int components_count = 0;
3516   unsigned int calculate_attr_size = 0;
3517   if (record_attribute_start != NULL) {

3762   }
3763   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3764                      "Bad length on BootstrapMethods in class file %s",
3765                      CHECK);
3766 }
3767 
3768 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3769                                                  ConstantPool* cp,
3770                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3771                                                  TRAPS) {
3772   assert(cfs != NULL, "invariant");
3773   assert(cp != NULL, "invariant");
3774   assert(parsed_annotations != NULL, "invariant");
3775 
3776   // Set inner classes attribute to default sentinel
3777   _inner_classes = Universe::the_empty_short_array();
3778   // Set nest members attribute to default sentinel
3779   _nest_members = Universe::the_empty_short_array();
3780   // Set _permitted_subclasses attribute to default sentinel
3781   _permitted_subclasses = Universe::the_empty_short_array();
3782   // Set _preload_classes attribute to default sentinel
3783   _preload_classes = Universe::the_empty_short_array();
3784   cfs->guarantee_more(2, CHECK);  // attributes_count
3785   u2 attributes_count = cfs->get_u2_fast();
3786   bool parsed_sourcefile_attribute = false;
3787   bool parsed_innerclasses_attribute = false;
3788   bool parsed_nest_members_attribute = false;
3789   bool parsed_permitted_subclasses_attribute = false;
3790   bool parsed_preload_attribute = false;
3791   bool parsed_nest_host_attribute = false;
3792   bool parsed_record_attribute = false;
3793   bool parsed_enclosingmethod_attribute = false;
3794   bool parsed_bootstrap_methods_attribute = false;
3795   const u1* runtime_visible_annotations = NULL;
3796   int runtime_visible_annotations_length = 0;
3797   const u1* runtime_invisible_annotations = NULL;
3798   int runtime_invisible_annotations_length = 0;
3799   const u1* runtime_visible_type_annotations = NULL;
3800   int runtime_visible_type_annotations_length = 0;
3801   const u1* runtime_invisible_type_annotations = NULL;
3802   int runtime_invisible_type_annotations_length = 0;
3803   bool runtime_invisible_type_annotations_exists = false;
3804   bool runtime_invisible_annotations_exists = false;
3805   bool parsed_source_debug_ext_annotations_exist = false;
3806   const u1* inner_classes_attribute_start = NULL;
3807   u4  inner_classes_attribute_length = 0;
3808   u2  enclosing_method_class_index = 0;
3809   u2  enclosing_method_method_index = 0;
3810   const u1* nest_members_attribute_start = NULL;
3811   u4  nest_members_attribute_length = 0;
3812   const u1* record_attribute_start = NULL;
3813   u4  record_attribute_length = 0;
3814   const u1* permitted_subclasses_attribute_start = NULL;
3815   u4  permitted_subclasses_attribute_length = 0;
3816   const u1* preload_attribute_start = NULL;
3817   u4  preload_attribute_length = 0;
3818 
3819   // Iterate over attributes
3820   while (attributes_count--) {
3821     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3822     const u2 attribute_name_index = cfs->get_u2_fast();
3823     const u4 attribute_length = cfs->get_u4_fast();
3824     check_property(
3825       valid_symbol_at(attribute_name_index),
3826       "Attribute name has bad constant pool index %u in class file %s",
3827       attribute_name_index, CHECK);
3828     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3829     if (tag == vmSymbols::tag_source_file()) {
3830       // Check for SourceFile tag
3831       if (_need_verify) {
3832         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3833       }
3834       if (parsed_sourcefile_attribute) {
3835         classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3836         return;
3837       } else {

4024               return;
4025             }
4026             parsed_record_attribute = true;
4027             record_attribute_start = cfs->current();
4028             record_attribute_length = attribute_length;
4029           } else if (_major_version >= JAVA_17_VERSION) {
4030             if (tag == vmSymbols::tag_permitted_subclasses()) {
4031               if (parsed_permitted_subclasses_attribute) {
4032                 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
4033                 return;
4034               }
4035               // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
4036               if (_access_flags.is_final()) {
4037                 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
4038                 return;
4039               }
4040               parsed_permitted_subclasses_attribute = true;
4041               permitted_subclasses_attribute_start = cfs->current();
4042               permitted_subclasses_attribute_length = attribute_length;
4043             }
4044             if (EnableValhalla && tag == vmSymbols::tag_preload()) {
4045               if (parsed_preload_attribute) {
4046                 classfile_parse_error("Multiple Preload attributes in class file %s", CHECK);
4047                 return;
4048               }
4049               parsed_preload_attribute = true;
4050               preload_attribute_start = cfs->current();
4051               preload_attribute_length = attribute_length;
4052             }
4053           }
4054           // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
4055           cfs->skip_u1(attribute_length, CHECK);
4056         } else {
4057           // Unknown attribute
4058           cfs->skip_u1(attribute_length, CHECK);
4059         }
4060       } else {
4061         // Unknown attribute
4062         cfs->skip_u1(attribute_length, CHECK);
4063       }
4064     } else {
4065       // Unknown attribute
4066       cfs->skip_u1(attribute_length, CHECK);
4067     }
4068   }
4069   _class_annotations = assemble_annotations(runtime_visible_annotations,
4070                                             runtime_visible_annotations_length,
4071                                             runtime_invisible_annotations,
4072                                             runtime_invisible_annotations_length,

4113                             CHECK);
4114     if (_need_verify) {
4115       guarantee_property(record_attribute_length == calculated_attr_length,
4116                          "Record attribute has wrong length in class file %s",
4117                          CHECK);
4118     }
4119   }
4120 
4121   if (parsed_permitted_subclasses_attribute) {
4122     const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
4123                             cfs,
4124                             permitted_subclasses_attribute_start,
4125                             CHECK);
4126     if (_need_verify) {
4127       guarantee_property(
4128         permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
4129         "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
4130     }
4131   }
4132 
4133   if (parsed_preload_attribute) {
4134     const u2 num_classes = parse_classfile_preload_attribute(
4135                             cfs,
4136                             preload_attribute_start,
4137                             CHECK);
4138     if (_need_verify) {
4139       guarantee_property(
4140         preload_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
4141         "Wrong Preload attribute length in class file %s", CHECK);
4142     }
4143   }
4144 
4145   if (_max_bootstrap_specifier_index >= 0) {
4146     guarantee_property(parsed_bootstrap_methods_attribute,
4147                        "Missing BootstrapMethods attribute in class file %s", CHECK);
4148   }
4149 }
4150 
4151 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
4152   assert(k != NULL, "invariant");
4153 
4154   if (_synthetic_flag)
4155     k->set_is_synthetic();
4156   if (_sourcefile_index != 0) {
4157     k->set_source_file_name_index(_sourcefile_index);
4158   }
4159   if (_generic_signature_index != 0) {
4160     k->set_generic_signature_index(_generic_signature_index);
4161   }
4162   if (_sde_buffer != NULL) {
4163     k->set_source_debug_extension(_sde_buffer, _sde_length);
4164   }

4189     // _combined_annotations so these fields can now be cleared.
4190     _class_annotations       = NULL;
4191     _class_type_annotations  = NULL;
4192     _fields_annotations      = NULL;
4193     _fields_type_annotations = NULL;
4194 }
4195 
4196 // Transfer ownership of metadata allocated to the InstanceKlass.
4197 void ClassFileParser::apply_parsed_class_metadata(
4198                                             InstanceKlass* this_klass,
4199                                             int java_fields_count) {
4200   assert(this_klass != NULL, "invariant");
4201 
4202   _cp->set_pool_holder(this_klass);
4203   this_klass->set_constants(_cp);
4204   this_klass->set_fields(_fields, java_fields_count);
4205   this_klass->set_methods(_methods);
4206   this_klass->set_inner_classes(_inner_classes);
4207   this_klass->set_nest_members(_nest_members);
4208   this_klass->set_nest_host_index(_nest_host);
4209   this_klass->set_preload_classes(_preload_classes);
4210   this_klass->set_annotations(_combined_annotations);
4211   this_klass->set_permitted_subclasses(_permitted_subclasses);
4212   this_klass->set_record_components(_record_components);
4213   // Delay the setting of _local_interfaces and _transitive_interfaces until after
4214   // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
4215   // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
4216   // its _super. If an OOM occurs while loading the current klass, its _super field
4217   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
4218   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
4219   // dereferences to the deallocated _transitive_interfaces will result in a crash.
4220 
4221   // Clear out these fields so they don't get deallocated by the destructor
4222   clear_class_metadata();
4223 }
4224 
4225 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
4226                                                        int runtime_visible_annotations_length,
4227                                                        const u1* const runtime_invisible_annotations,
4228                                                        int runtime_invisible_annotations_length,
4229                                                        TRAPS) {

4241     }
4242     if (runtime_invisible_annotations != NULL) {
4243       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
4244         int append = runtime_visible_annotations_length+i;
4245         annotations->at_put(append, runtime_invisible_annotations[i]);
4246       }
4247     }
4248   }
4249   return annotations;
4250 }
4251 
4252 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
4253                                                         const int super_class_index,
4254                                                         const bool need_verify,
4255                                                         TRAPS) {
4256   assert(cp != NULL, "invariant");
4257   const InstanceKlass* super_klass = NULL;
4258 
4259   if (super_class_index == 0) {
4260     check_property(_class_name == vmSymbols::java_lang_Object(),
4261                    "Invalid superclass index 0 in class file %s",

4262                    CHECK_NULL);
4263   } else {
4264     check_property(valid_klass_reference_at(super_class_index),
4265                    "Invalid superclass index %u in class file %s",
4266                    super_class_index,
4267                    CHECK_NULL);
4268     // The class name should be legal because it is checked when parsing constant pool.
4269     // However, make sure it is not an array type.

4270     if (cp->tag_at(super_class_index).is_klass()) {
4271       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));




4272     }
4273     if (need_verify) {
4274       bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
4275       guarantee_property(!is_array,
4276                         "Bad superclass name in class file %s", CHECK_NULL);
4277     }
4278   }
4279   return super_klass;
4280 }
4281 
4282 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
4283   _max_nonstatic_oop_maps = max_blocks;
4284   _nonstatic_oop_map_count = 0;
4285   if (max_blocks == 0) {
4286     _nonstatic_oop_maps = NULL;
4287   } else {
4288     _nonstatic_oop_maps =
4289         NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4290     memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4291   }
4292 }
4293 
4294 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {

4378 }
4379 
4380 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4381   st->print_cr("  OopMapBlocks: %3d  /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4382   if (_nonstatic_oop_map_count > 0) {
4383     OopMapBlock* map = _nonstatic_oop_maps;
4384     OopMapBlock* last_map = last_oop_map();
4385     assert(map <= last_map, "Last less than first");
4386     while (map <= last_map) {
4387       st->print_cr("    Offset: %3d  -%3d Count: %3d", map->offset(),
4388                    map->offset() + map->offset_span() - heapOopSize, map->count());
4389       map++;
4390     }
4391   }
4392 }
4393 
4394 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4395   print_on(st);
4396 }
4397 
4398 void ClassFileParser::throwInlineTypeLimitation(THREAD_AND_LOCATION_DECL,
4399                                                 const char* msg,
4400                                                 const Symbol* name,
4401                                                 const Symbol* sig) const {
4402 
4403   ResourceMark rm(THREAD);
4404   if (name == NULL || sig == NULL) {
4405     Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4406         vmSymbols::java_lang_ClassFormatError(),
4407         "class: %s - %s", _class_name->as_C_string(), msg);
4408   }
4409   else {
4410     Exceptions::fthrow(THREAD_AND_LOCATION_ARGS,
4411         vmSymbols::java_lang_ClassFormatError(),
4412         "\"%s\" sig: \"%s\" class: %s - %s", name->as_C_string(), sig->as_C_string(),
4413         _class_name->as_C_string(), msg);
4414   }
4415 }
4416 
4417 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4418   assert(ik != NULL, "invariant");
4419 
4420   const Klass* const super = ik->super();
4421 
4422   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4423   // in which case we don't have to register objects as finalizable
4424   if (!_has_empty_finalizer) {
4425     if (_has_finalizer ||
4426         (super != NULL && super->has_finalizer())) {
4427       ik->set_has_finalizer();
4428     }
4429   }
4430 
4431 #ifdef ASSERT
4432   bool f = false;
4433   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4434                                            vmSymbols::void_method_signature());
4435   if (InstanceKlass::is_finalization_enabled() &&
4436       (m != NULL) && !m->is_empty_method()) {
4437       f = true;
4438   }
4439 
4440   // Spec doesn't prevent agent from redefinition of empty finalizer.
4441   // Despite the fact that it's generally bad idea and redefined finalizer
4442   // will not work as expected we shouldn't abort vm in this case
4443   if (!ik->has_redefined_this_or_super()) {
4444     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4445   }
4446 #endif
4447 
4448   // Check if this klass supports the java.lang.Cloneable interface
4449   if (vmClasses::Cloneable_klass_loaded()) {
4450     if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4451       if (ik->is_inline_klass()) {
4452         JavaThread *THREAD = JavaThread::current();
4453         throwInlineTypeLimitation(THREAD_AND_LOCATION, "Inline Types do not support Cloneable");
4454         return;
4455       }
4456       ik->set_is_cloneable();
4457     }
4458   }
4459 
4460   // Check if this klass has a vanilla default constructor
4461   if (super == NULL) {
4462     // java.lang.Object has empty default constructor
4463     ik->set_has_vanilla_constructor();
4464   } else {
4465     if (super->has_vanilla_constructor() &&
4466         _has_vanilla_constructor) {
4467       ik->set_has_vanilla_constructor();
4468     }
4469 #ifdef ASSERT
4470     bool v = false;
4471     if (super->has_vanilla_constructor()) {
4472       const Method* const constructor =
4473         ik->find_method(vmSymbols::object_initializer_name(),
4474                        vmSymbols::void_method_signature());
4475       if (constructor != NULL && constructor->is_vanilla_constructor()) {
4476         v = true;
4477       }
4478     }
4479     assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4480 #endif
4481   }
4482 
4483   // If it cannot be fast-path allocated, set a bit in the layout helper.
4484   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4485   assert(ik->size_helper() > 0, "layout_helper is initialized");
4486   if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4487       || ik->is_abstract() || ik->is_interface()
4488       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == NULL)
4489       || ik->size_helper() >= FastAllocateSizeLimit) {
4490     // Forbid fast-path allocation.
4491     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4492     ik->set_layout_helper(lh);
4493   }
4494 }
4495 
4496 bool ClassFileParser::supports_inline_types() const {
4497   // Inline types are only supported by class file version 61.65535 and later
4498   return _major_version > JAVA_21_VERSION ||
4499          (_major_version == JAVA_21_VERSION /*&& _minor_version == JAVA_PREVIEW_MINOR_VERSION*/); // JAVA_PREVIEW_MINOR_VERSION not yet implemented by javac, check JVMS draft
4500 }
4501 
4502 // utility methods for appending an array with check for duplicates
4503 
4504 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4505                               const Array<InstanceKlass*>* const ifs) {
4506   // iterate over new interfaces
4507   for (int i = 0; i < ifs->length(); i++) {
4508     InstanceKlass* const e = ifs->at(i);
4509     assert(e->is_klass() && e->is_interface(), "just checking");
4510     // add new interface
4511     result->append_if_missing(e);
4512   }
4513 }
4514 
4515 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4516                                                             Array<InstanceKlass*>* local_ifs,
4517                                                             ClassLoaderData* loader_data,
4518                                                             TRAPS) {
4519   assert(local_ifs != NULL, "invariant");
4520   assert(loader_data != NULL, "invariant");
4521 

4525   // Add superclass transitive interfaces size
4526   if (super != NULL) {
4527     super_size = super->transitive_interfaces()->length();
4528     max_transitive_size += super_size;
4529   }
4530   // Add local interfaces' super interfaces
4531   const int local_size = local_ifs->length();
4532   for (int i = 0; i < local_size; i++) {
4533     InstanceKlass* const l = local_ifs->at(i);
4534     max_transitive_size += l->transitive_interfaces()->length();
4535   }
4536   // Finally add local interfaces
4537   max_transitive_size += local_size;
4538   // Construct array
4539   if (max_transitive_size == 0) {
4540     // no interfaces, use canonicalized array
4541     return Universe::the_empty_instance_klass_array();
4542   } else if (max_transitive_size == super_size) {
4543     // no new local interfaces added, share superklass' transitive interface array
4544     return super->transitive_interfaces();
4545     // The three lines below are commented to work around bug JDK-8245487
4546 //  } else if (max_transitive_size == local_size) {
4547 //    // only local interfaces added, share local interface array
4548 //    return local_ifs;
4549   } else {
4550     ResourceMark rm;
4551     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4552 
4553     // Copy down from superclass
4554     if (super != NULL) {
4555       append_interfaces(result, super->transitive_interfaces());
4556     }
4557 
4558     // Copy down from local interfaces' superinterfaces
4559     for (int i = 0; i < local_size; i++) {
4560       InstanceKlass* const l = local_ifs->at(i);
4561       append_interfaces(result, l->transitive_interfaces());
4562     }
4563     // Finally add local interfaces
4564     append_interfaces(result, local_ifs);
4565 
4566     // length will be less than the max_transitive_size if duplicates were removed
4567     const int length = result->length();
4568     assert(length <= max_transitive_size, "just checking");
4569 
4570     Array<InstanceKlass*>* const new_result =
4571       MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4572     for (int i = 0; i < length; i++) {
4573       InstanceKlass* const e = result->at(i);
4574       assert(e != NULL, "just checking");
4575       new_result->at_put(i, e);
4576     }
4577     return new_result;
4578   }
4579 }
4580 
4581 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4582   assert(this_klass != NULL, "invariant");
4583   const Klass* const super = this_klass->super();
4584 
4585   if (super != NULL) {
4586     const InstanceKlass* super_ik = InstanceKlass::cast(super);
4587 
4588     if (super->is_final()) {
4589       classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4590       return;
4591     }
4592 
4593     if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4594       classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4595       return;
4596     }
4597 
4598     // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4599     // flag set. But, java.lang.Object must still be allowed to be a direct super class
4600     // for a value classes.  So, it is treated as a special case for now.
4601     if (this_klass->access_flags().is_value_class() &&
4602         super_ik->name() != vmSymbols::java_lang_Object() &&
4603         super_ik->is_identity_class()) {
4604       classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4605       return;
4606     }
4607 
4608     // If the loader is not the boot loader then throw an exception if its
4609     // superclass is in package jdk.internal.reflect and its loader is not a
4610     // special reflection class loader
4611     if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4612       PackageEntry* super_package = super->package();
4613       if (super_package != NULL &&
4614           super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4615           !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4616         ResourceMark rm(THREAD);
4617         Exceptions::fthrow(
4618           THREAD_AND_LOCATION,
4619           vmSymbols::java_lang_IllegalAccessError(),
4620           "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4621           this_klass->external_name(),
4622           this_klass->class_loader_data()->loader_name_and_id(),
4623           super->external_name());
4624         return;
4625       }
4626     }
4627 

4771 
4772   for (int index = 0; index < num_methods; index++) {
4773     const Method* const m = methods->at(index);
4774     // if m is static and not the init method, throw a verify error
4775     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4776       ResourceMark rm(THREAD);
4777       Exceptions::fthrow(
4778         THREAD_AND_LOCATION,
4779         vmSymbols::java_lang_VerifyError(),
4780         "Illegal static method %s in interface %s",
4781         m->name()->as_C_string(),
4782         this_klass->external_name()
4783       );
4784       return;
4785     }
4786   }
4787 }
4788 
4789 // utility methods for format checking
4790 
4791 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4792   const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4793   const bool is_value_class = (flags & JVM_ACC_VALUE) != 0;
4794   const bool is_primitive_class = (flags & JVM_ACC_PRIMITIVE) != 0;
4795   const bool is_identity_class = (flags & JVM_ACC_IDENTITY) != 0;
4796   const bool is_inner_class = name != NULL;
4797   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4798   if (is_module) {
4799     ResourceMark rm(THREAD);
4800     Exceptions::fthrow(
4801       THREAD_AND_LOCATION,
4802       vmSymbols::java_lang_NoClassDefFoundError(),
4803       "%s is not a class because access_flag ACC_MODULE is set",
4804       _class_name->as_C_string());
4805     return;
4806   }
4807 
4808   if (is_value_class && !EnableValhalla) {
4809       ResourceMark rm(THREAD);
4810       Exceptions::fthrow(
4811         THREAD_AND_LOCATION,
4812         vmSymbols::java_lang_ClassFormatError(),
4813         "Class modifier ACC_VALUE in class %s requires option -XX:+EnableValhalla",
4814         _class_name->as_C_string()
4815       );
4816     return;
4817   }
4818 
4819   if (is_primitive_class && !EnablePrimitiveClasses) {
4820       ResourceMark rm(THREAD);
4821       Exceptions::fthrow(
4822         THREAD_AND_LOCATION,
4823         vmSymbols::java_lang_ClassFormatError(),
4824         "Class modifier ACC_PRIMITIVE in class %s requires option -XX:+EnablePrimitiveClasses",
4825         _class_name->as_C_string()
4826       );
4827     return;
4828   }
4829 
4830   // if (!_need_verify) { return; }
4831 
4832   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4833   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4834   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4835   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4836   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4837   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4838   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4839 
4840   if ((is_abstract && is_final) ||
4841       (is_interface && !is_abstract) ||
4842       (is_interface && major_gte_1_5 && ((is_super && (!EnableValhalla || !supports_inline_types())) || is_enum)) ||   //  ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4843       (!is_interface && major_gte_1_5 && is_annotation) ||
4844       (is_value_class && is_enum) ||
4845       (is_identity_class && is_value_class) ||
4846       (EnableValhalla && supports_inline_types() && !is_module && !is_abstract && !is_Object && !(is_identity_class || is_value_class) && !is_inner_class) ||
4847       (EnablePrimitiveClasses && supports_inline_types() && is_primitive_class && (!is_value_class || !is_final || is_interface || is_abstract))) {
4848     ResourceMark rm(THREAD);
4849     const char* class_note = "";
4850     if (is_value_class)  class_note = " (a value class)";
4851     if (is_primitive_class)  class_note = " (a primitive class)";
4852     if (is_value_class && is_identity_class) class_note = " (a value and identity class)";
4853     if (name == NULL) { // Not an inner class
4854       Exceptions::fthrow(
4855         THREAD_AND_LOCATION,
4856         vmSymbols::java_lang_ClassFormatError(),
4857         "Illegal class modifiers in class %s%s: 0x%X",
4858         _class_name->as_C_string(), class_note, flags
4859       );
4860       return;
4861     } else {
4862       Exceptions::fthrow(
4863         THREAD_AND_LOCATION,
4864         vmSymbols::java_lang_ClassFormatError(),
4865         "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4866         name, class_note, _class_name->as_C_string(), flags
4867       );
4868       return;
4869     }
4870   }
4871 }
4872 
4873 static bool has_illegal_visibility(jint flags) {
4874   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4875   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4876   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4877 
4878   return ((is_public && is_protected) ||
4879           (is_public && is_private) ||
4880           (is_protected && is_private));
4881 }
4882 
4883 // A legal major_version.minor_version must be one of the following:
4884 //
4885 //  Major_version >= 45 and major_version < 56, any minor_version.
4886 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4887 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4888 //
4889 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){

4915         THREAD_AND_LOCATION,
4916         vmSymbols::java_lang_UnsupportedClassVersionError(),
4917         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4918         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4919         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4920       return;
4921     }
4922 
4923     if (!Arguments::enable_preview()) {
4924       classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4925                            class_name, major, minor, THREAD);
4926       return;
4927     }
4928 
4929   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4930     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4931                          class_name, major, minor, THREAD);
4932   }
4933 }
4934 
4935 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4936                                                    AccessFlags class_access_flags,
4937                                                    TRAPS) const {
4938   if (!_need_verify) { return; }
4939 
4940   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4941   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4942   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4943   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4944   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4945   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4946   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4947   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4948   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4949 
4950   const bool is_interface = class_access_flags.is_interface();
4951   const bool is_abstract = class_access_flags.is_abstract();
4952   const bool is_value_class = class_access_flags.is_value_class();
4953   const bool is_identity_class = class_access_flags.is_identity_class();
4954 
4955   bool is_illegal = false;
4956 
4957   if (is_interface) {
4958     if (!is_public || !is_static || !is_final || is_private ||
4959         is_protected || is_volatile || is_transient ||
4960         (major_gte_1_5 && is_enum)) {
4961       is_illegal = true;
4962     }
4963   } else { // not interface
4964     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4965       is_illegal = true;
4966     } else {
4967       if (is_value_class && !is_abstract && !is_static && !is_final) {
4968         is_illegal = true;
4969       } else if (is_abstract && !is_identity_class && !is_static) {
4970         is_illegal = true;
4971       }
4972     }
4973   }
4974 
4975   if (is_illegal) {
4976     ResourceMark rm(THREAD);
4977     Exceptions::fthrow(
4978       THREAD_AND_LOCATION,
4979       vmSymbols::java_lang_ClassFormatError(),
4980       "Illegal field modifiers in class %s: 0x%X",
4981       _class_name->as_C_string(), flags);
4982     return;
4983   }
4984 }
4985 
4986 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4987                                                     AccessFlags class_access_flags,
4988                                                     const Symbol* name,
4989                                                     TRAPS) const {
4990   if (!_need_verify) { return; }
4991 
4992   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4993   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4994   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4995   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4996   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4997   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4998   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4999   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
5000   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
5001   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
5002   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
5003   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
5004   const bool major_gte_17    = _major_version >= JAVA_17_VERSION;
5005   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
5006   const bool is_factory      = (name == vmSymbols::inline_factory_name() && supports_inline_types());
5007   const bool is_interface    = class_access_flags.is_interface();
5008   const bool is_value_class  = class_access_flags.is_value_class();
5009   const bool is_identity_class = class_access_flags.is_identity_class();
5010   const bool is_abstract_class = class_access_flags.is_abstract();
5011 
5012   bool is_illegal = false;
5013 
5014   const char* class_note = "";
5015   if (is_interface) {
5016     if (major_gte_8) {
5017       // Class file version is JAVA_8_VERSION or later Methods of
5018       // interfaces may set any of the flags except ACC_PROTECTED,
5019       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
5020       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
5021       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
5022           (is_native || is_protected || is_final || is_synchronized) ||
5023           // If a specific method of a class or interface has its
5024           // ACC_ABSTRACT flag set, it must not have any of its
5025           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
5026           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
5027           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
5028           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
5029           (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
5030         is_illegal = true;
5031       }
5032     } else if (major_gte_1_5) {
5033       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
5034       if (!is_public || is_private || is_protected || is_static || is_final ||
5035           is_synchronized || is_native || !is_abstract || is_strict) {
5036         is_illegal = true;
5037       }
5038     } else {
5039       // Class file version is pre-JAVA_1_5_VERSION
5040       if (!is_public || is_static || is_final || is_native || !is_abstract) {
5041         is_illegal = true;
5042       }
5043     }
5044   } else { // not interface
5045     if (has_illegal_visibility(flags)) {
5046       is_illegal = true;
5047     } else {
5048       if (is_factory) { // <vnew> factory method
5049         if (is_final || is_synchronized || is_native || !is_static ||
5050             is_abstract || is_bridge) {
5051           is_illegal = true;
5052           class_note = (is_value_class ? " (a value class)" : " (not a value class)");
5053         }
5054       } else if (is_initializer) {
5055         if (is_static || is_final || is_synchronized || is_native ||
5056             is_abstract || (major_gte_1_5 && is_bridge)) {
5057           is_illegal = true;
5058         }
5059       } else { // not initializer
5060         if (!is_identity_class && is_synchronized && !is_static) {
5061           is_illegal = true;
5062           class_note = " (not an identity class)";
5063         } else {
5064           if (is_abstract) {
5065             if ((is_final || is_native || is_private || is_static ||
5066                 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
5067               is_illegal = true;
5068             }
5069           }
5070         }
5071       }
5072     }
5073   }
5074 
5075   if (is_illegal) {
5076     ResourceMark rm(THREAD);
5077     if (is_value_class && is_initializer) {
5078       Exceptions::fthrow(
5079         THREAD_AND_LOCATION,
5080         vmSymbols::java_lang_ClassFormatError(),
5081         "Method <init> is not allowed in value class %s",
5082         _class_name->as_C_string());
5083     } else {
5084       Exceptions::fthrow(
5085         THREAD_AND_LOCATION,
5086         vmSymbols::java_lang_ClassFormatError(),
5087         "Method %s in class %s%s has illegal modifiers: 0x%X",
5088         name->as_C_string(), _class_name->as_C_string(),
5089         class_note, flags);
5090     }
5091     return;
5092   }
5093 }
5094 
5095 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
5096                                         int length,
5097                                         TRAPS) const {
5098   assert(_need_verify, "only called when _need_verify is true");
5099   if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
5100     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
5101   }
5102 }
5103 
5104 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
5105 // In class names, '/' separates unqualified names.  This is verified in this function also.
5106 // Method names also may not contain the characters '<' or '>', unless <init>
5107 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
5108 // method.  Because these names have been checked as special cases before
5109 // calling this method in verify_legal_method_name.
5110 //

5228 // be taken as a field signature. Allow "void" if void_ok.
5229 // Return a pointer to just past the signature.
5230 // Return NULL if no legal signature is found.
5231 const char* ClassFileParser::skip_over_field_signature(const char* signature,
5232                                                        bool void_ok,
5233                                                        unsigned int length,
5234                                                        TRAPS) const {
5235   unsigned int array_dim = 0;
5236   while (length > 0) {
5237     switch (signature[0]) {
5238     case JVM_SIGNATURE_VOID: if (!void_ok) { return NULL; }
5239     case JVM_SIGNATURE_BOOLEAN:
5240     case JVM_SIGNATURE_BYTE:
5241     case JVM_SIGNATURE_CHAR:
5242     case JVM_SIGNATURE_SHORT:
5243     case JVM_SIGNATURE_INT:
5244     case JVM_SIGNATURE_FLOAT:
5245     case JVM_SIGNATURE_LONG:
5246     case JVM_SIGNATURE_DOUBLE:
5247       return signature + 1;
5248     case JVM_SIGNATURE_PRIMITIVE_OBJECT:
5249       // Can't enable this check fully until JDK upgrades the bytecode generators (TODO: JDK-8270852).
5250       // For now, compare to class file version 51 so old verifier doesn't see Q signatures.
5251       if ( (_major_version < 51 /* CONSTANT_CLASS_DESCRIPTORS */ ) || (!EnablePrimitiveClasses)) {
5252         classfile_parse_error("Class name contains illegal Q-signature "
5253                               "in descriptor in class file %s, requires option -XX:+EnablePrimitiveClasses",
5254                               CHECK_0);
5255         return NULL;
5256       }
5257       // fall through
5258     case JVM_SIGNATURE_CLASS:
5259     {
5260       if (_major_version < JAVA_1_5_VERSION) {
5261         // Skip over the class name if one is there
5262         const char* const p = skip_over_field_name(signature + 1, true, --length);
5263 
5264         // The next character better be a semicolon
5265         if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
5266           return p + 1;
5267         }
5268       }
5269       else {
5270         // Skip leading 'L' or 'Q' and ignore first appearance of ';'
5271         signature++;
5272         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
5273         // Format check signature
5274         if (c != NULL) {
5275           int newlen = c - (char*) signature;
5276           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
5277           if (!legal) {
5278             classfile_parse_error("Class name is empty or contains illegal character "
5279                                   "in descriptor in class file %s",
5280                                   THREAD);
5281             return NULL;
5282           }
5283           return signature + newlen + 1;
5284         }
5285       }
5286       return NULL;
5287     }
5288     case JVM_SIGNATURE_ARRAY:
5289       array_dim++;
5290       if (array_dim > 255) {

5306 
5307 // Checks if name is a legal class name.
5308 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
5309   if (!_need_verify || _relax_verify) { return; }
5310 
5311   assert(name->refcount() > 0, "symbol must be kept alive");
5312   char* bytes = (char*)name->bytes();
5313   unsigned int length = name->utf8_length();
5314   bool legal = false;
5315 
5316   if (length > 0) {
5317     const char* p;
5318     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
5319       p = skip_over_field_signature(bytes, false, length, CHECK);
5320       legal = (p != NULL) && ((p - bytes) == (int)length);
5321     } else if (_major_version < JAVA_1_5_VERSION) {
5322       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5323         p = skip_over_field_name(bytes, true, length);
5324         legal = (p != NULL) && ((p - bytes) == (int)length);
5325       }
5326     } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
5327                    && bytes[length - 1] == ';' ) {
5328       // Support for L...; and Q...; descriptors
5329       legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
5330     } else {
5331       // 4900761: relax the constraints based on JSR202 spec
5332       // Class names may be drawn from the entire Unicode character set.
5333       // Identifiers between '/' must be unqualified names.
5334       // The utf8 string has been verified when parsing cpool entries.
5335       legal = verify_unqualified_name(bytes, length, LegalClass);
5336     }
5337   }
5338   if (!legal) {
5339     ResourceMark rm(THREAD);
5340     assert(_class_name != NULL, "invariant");
5341     Exceptions::fthrow(
5342       THREAD_AND_LOCATION,
5343       vmSymbols::java_lang_ClassFormatError(),
5344       "Illegal class name \"%.*s\" in class file %s", length, bytes,
5345       _class_name->as_C_string()
5346     );
5347     return;
5348   }
5349 }

5375       THREAD_AND_LOCATION,
5376       vmSymbols::java_lang_ClassFormatError(),
5377       "Illegal field name \"%.*s\" in class %s", length, bytes,
5378       _class_name->as_C_string()
5379     );
5380     return;
5381   }
5382 }
5383 
5384 // Checks if name is a legal method name.
5385 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5386   if (!_need_verify || _relax_verify) { return; }
5387 
5388   assert(name != NULL, "method name is null");
5389   char* bytes = (char*)name->bytes();
5390   unsigned int length = name->utf8_length();
5391   bool legal = false;
5392 
5393   if (length > 0) {
5394     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5395       if (name == vmSymbols::object_initializer_name() ||
5396           name == vmSymbols::class_initializer_name()  ||
5397           (EnableValhalla && supports_inline_types() &&
5398           name == vmSymbols::inline_factory_name())) {
5399         legal = true;
5400       }
5401     } else if (_major_version < JAVA_1_5_VERSION) {
5402       const char* p;
5403       p = skip_over_field_name(bytes, false, length);
5404       legal = (p != NULL) && ((p - bytes) == (int)length);
5405     } else {
5406       // 4881221: relax the constraints based on JSR202 spec
5407       legal = verify_unqualified_name(bytes, length, LegalMethod);
5408     }
5409   }
5410 
5411   if (!legal) {
5412     ResourceMark rm(THREAD);
5413     assert(_class_name != NULL, "invariant");
5414     Exceptions::fthrow(
5415       THREAD_AND_LOCATION,
5416       vmSymbols::java_lang_ClassFormatError(),
5417       "Illegal method name \"%.*s\" in class %s", length, bytes,
5418       _class_name->as_C_string()
5419     );
5420     return;
5421   }
5422 }
5423 
5424 
5425 // Checks if signature is a legal field signature.
5426 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5427                                                    const Symbol* signature,
5428                                                    TRAPS) const {
5429   if (!_need_verify) { return; }
5430   if ((!supports_inline_types() || !EnablePrimitiveClasses) && (signature->is_Q_signature() || signature->is_Q_array_signature())) {
5431     throwIllegalSignature("Field", name, signature, CHECK);
5432   }
5433 
5434   const char* const bytes = (const char* const)signature->bytes();
5435   const unsigned int length = signature->utf8_length();
5436   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5437 
5438   if (p == NULL || (p - bytes) != (int)length) {
5439     throwIllegalSignature("Field", name, signature, CHECK);
5440   }
5441 }
5442 
5443 // Check that the signature is compatible with the method name.  For example,
5444 // check that <init> has a void signature.
5445 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5446                                                        const Symbol* signature,
5447                                                        TRAPS) const {
5448   if (!_need_verify) {
5449     return;
5450   }
5451 
5452   // Class initializers cannot have args for class format version >= 51.
5453   if (name == vmSymbols::class_initializer_name() &&
5454       signature != vmSymbols::void_method_signature() &&
5455       _major_version >= JAVA_7_VERSION) {
5456     throwIllegalSignature("Method", name, signature, THREAD);
5457     return;
5458   }
5459 
5460   if (!is_value_class()) {
5461     int sig_length = signature->utf8_length();
5462     if (name->utf8_length() > 0 &&
5463       name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5464       sig_length > 0 &&
5465       signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5466       throwIllegalSignature("Method", name, signature, THREAD);
5467     }
5468   }
5469 }
5470 
5471 // Checks if signature is a legal method signature.
5472 // Returns number of parameters
5473 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5474                                                    const Symbol* signature,
5475                                                    TRAPS) const {
5476   if (!_need_verify) {
5477     // make sure caller's args_size will be less than 0 even for non-static
5478     // method so it will be recomputed in compute_size_of_parameters().
5479     return -2;
5480   }
5481 
5482   unsigned int args_size = 0;
5483   const char* p = (const char*)signature->bytes();
5484   unsigned int length = signature->utf8_length();
5485   const char* nextp;
5486 
5487   // The first character must be a '('

5623   }
5624 }
5625 
5626 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5627                                                       const ClassInstanceInfo& cl_inst_info,
5628                                                       TRAPS) {
5629   if (_klass != NULL) {
5630     return _klass;
5631   }
5632 
5633   InstanceKlass* const ik =
5634     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5635 
5636   if (is_hidden()) {
5637     mangle_hidden_class_name(ik);
5638   }
5639 
5640   fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5641 
5642   assert(_klass == ik, "invariant");

5643   return ik;
5644 }
5645 
5646 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5647                                           bool changed_by_loadhook,
5648                                           const ClassInstanceInfo& cl_inst_info,
5649                                           TRAPS) {
5650   assert(ik != NULL, "invariant");
5651 
5652   // Set name and CLD before adding to CLD
5653   ik->set_class_loader_data(_loader_data);
5654   ik->set_name(_class_name);
5655 
5656   // Add all classes to our internal class loader list here,
5657   // including classes in the bootstrap (NULL) class loader.
5658   const bool publicize = !is_internal();
5659 
5660   _loader_data->add_class(ik, publicize);
5661 
5662   set_klass_to_deallocate(ik);
5663 
5664   assert(_field_info != NULL, "invariant");
5665   assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5666   assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5667          "sanity");
5668 
5669   assert(ik->is_instance_klass(), "sanity");
5670   assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5671 
5672   // Fill in information already parsed
5673   ik->set_should_verify_class(_need_verify);
5674 
5675   // Not yet: supers are done below to support the new subtype-checking fields
5676   ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5677   ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5678   if (_field_info->_is_naturally_atomic && ik->is_inline_klass()) {
5679     ik->set_is_naturally_atomic();
5680   }
5681 
5682   if (carries_identity_modifier()) {
5683     ik->set_carries_identity_modifier();
5684   } else if (carries_value_modifier()) {
5685     ik->set_carries_value_modifier();
5686   }
5687 
5688   assert(_fac != NULL, "invariant");
5689   ik->set_static_oop_field_count(_fac->count[STATIC_OOP] + _fac->count[STATIC_INLINE]);
5690 
5691   // this transfers ownership of a lot of arrays from
5692   // the parser onto the InstanceKlass*
5693   apply_parsed_class_metadata(ik, _java_fields_count);
5694 
5695   // can only set dynamic nest-host after static nest information is set
5696   if (cl_inst_info.dynamic_nest_host() != NULL) {
5697     ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5698   }
5699 
5700   // note that is not safe to use the fields in the parser from this point on
5701   assert(NULL == _cp, "invariant");
5702   assert(NULL == _fields, "invariant");
5703   assert(NULL == _methods, "invariant");
5704   assert(NULL == _inner_classes, "invariant");
5705   assert(NULL == _nest_members, "invariant");
5706   assert(NULL == _preload_classes, "invariant");
5707   assert(NULL == _combined_annotations, "invariant");
5708   assert(NULL == _record_components, "invariant");
5709   assert(NULL == _permitted_subclasses, "invariant");
5710 
5711   if (_has_final_method) {
5712     ik->set_has_final_method();
5713   }
5714 
5715   ik->copy_method_ordering(_method_ordering, CHECK);
5716   // The InstanceKlass::_methods_jmethod_ids cache
5717   // is managed on the assumption that the initial cache
5718   // size is equal to the number of methods in the class. If
5719   // that changes, then InstanceKlass::idnum_can_increment()
5720   // has to be changed accordingly.
5721   ik->set_initial_method_idnum(ik->methods()->length());
5722 
5723   ik->set_this_class_index(_this_class_index);
5724 
5725   if (_is_hidden) {
5726     // _this_class_index is a CONSTANT_Class entry that refers to this
5727     // hidden class itself. If this class needs to refer to its own methods
5728     // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5729     // _this_class_index. However, because this class is hidden (it's
5730     // not stored in SystemDictionary), _this_class_index cannot be resolved
5731     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5732     // Therefore, we must eagerly resolve _this_class_index now.
5733     ik->constants()->klass_at_put(_this_class_index, ik);
5734   }
5735 
5736   ik->set_minor_version(_minor_version);
5737   ik->set_major_version(_major_version);
5738   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5739   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5740   if (_is_declared_atomic) {
5741     ik->set_is_declared_atomic();
5742   }
5743 
5744   if (_is_hidden) {
5745     ik->set_is_hidden();
5746   }
5747 
5748   // Set PackageEntry for this_klass
5749   oop cl = ik->class_loader();
5750   Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5751   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5752   ik->set_package(cld, NULL, CHECK);
5753 
5754   const Array<Method*>* const methods = ik->methods();
5755   assert(methods != NULL, "invariant");
5756   const int methods_len = methods->length();
5757 
5758   check_methods_for_intrinsics(ik, methods);
5759 
5760   // Fill in field values obtained by parse_classfile_attributes
5761   if (_parsed_annotations->has_any_annotations()) {
5762     _parsed_annotations->apply_to(ik);

5830 
5831   assert(_all_mirandas != NULL, "invariant");
5832 
5833   // Generate any default methods - default methods are public interface methods
5834   // that have a default implementation.  This is new with Java 8.
5835   if (_has_nonstatic_concrete_methods) {
5836     DefaultMethods::generate_default_methods(ik,
5837                                              _all_mirandas,
5838                                              CHECK);
5839   }
5840 
5841   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5842   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5843       !module_entry->has_default_read_edges()) {
5844     if (!module_entry->set_has_default_read_edges()) {
5845       // We won a potential race
5846       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5847     }
5848   }
5849 
5850   bool all_fields_empty = true;
5851   for (AllFieldStream fs(ik->fields(), ik->constants()); !fs.done(); fs.next()) {
5852     if (!fs.access_flags().is_static()) {
5853       if (fs.field_descriptor().is_inline_type()) {
5854         Klass* k = _inline_type_field_klasses->at(fs.index());
5855         ik->set_inline_type_field_klass(fs.index(), k);
5856         if (!InlineKlass::cast(k)->is_empty_inline_type()) { all_fields_empty = false; }
5857       } else {
5858         all_fields_empty = false;
5859       }
5860     } else if (is_inline_type() && (fs.name() == vmSymbols::default_value_name())) {
5861       InlineKlass::cast(ik)->set_default_value_offset(ik->field_offset(fs.index()));
5862     }
5863   }
5864 
5865   if (_is_empty_inline_type || (is_inline_type() && all_fields_empty)) {
5866     ik->set_is_empty_inline_type();
5867   }
5868 
5869   if (is_inline_type()) {
5870     InlineKlass* vk = InlineKlass::cast(ik);
5871     vk->set_alignment(_alignment);
5872     vk->set_first_field_offset(_first_field_offset);
5873     vk->set_exact_size_in_bytes(_exact_size_in_bytes);
5874     InlineKlass::cast(ik)->initialize_calling_convention(CHECK);
5875   }
5876 
5877   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5878 
5879   if (!is_internal()) {
5880     ik->print_class_load_logging(_loader_data, module_entry, _stream);
5881 
5882     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5883         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5884         log_is_enabled(Info, class, preview)) {
5885       ResourceMark rm;
5886       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5887                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5888     }
5889 
5890     if (log_is_enabled(Debug, class, resolve))  {
5891       ResourceMark rm;
5892       // print out the superclass.
5893       const char * from = ik->external_name();
5894       if (ik->java_super() != NULL) {
5895         log_debug(class, resolve)("%s %s (super)",
5896                    from,

5947 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5948                                  Symbol* name,
5949                                  ClassLoaderData* loader_data,
5950                                  const ClassLoadInfo* cl_info,
5951                                  Publicity pub_level,
5952                                  TRAPS) :
5953   _stream(stream),
5954   _class_name(NULL),
5955   _loader_data(loader_data),
5956   _is_hidden(cl_info->is_hidden()),
5957   _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5958   _orig_cp_size(0),
5959   _super_klass(),
5960   _cp(NULL),
5961   _fields(NULL),
5962   _methods(NULL),
5963   _inner_classes(NULL),
5964   _nest_members(NULL),
5965   _nest_host(0),
5966   _permitted_subclasses(NULL),
5967   _preload_classes(NULL),
5968   _record_components(NULL),
5969   _local_interfaces(NULL),
5970   _local_interface_indexes(NULL),
5971   _transitive_interfaces(NULL),
5972   _combined_annotations(NULL),
5973   _class_annotations(NULL),
5974   _class_type_annotations(NULL),
5975   _fields_annotations(NULL),
5976   _fields_type_annotations(NULL),
5977   _klass(NULL),
5978   _klass_to_deallocate(NULL),
5979   _parsed_annotations(NULL),
5980   _fac(NULL),
5981   _field_info(NULL),
5982   _inline_type_field_klasses(NULL),
5983   _method_ordering(NULL),
5984   _all_mirandas(NULL),
5985   _vtable_size(0),
5986   _itable_size(0),
5987   _num_miranda_methods(0),
5988   _protection_domain(cl_info->protection_domain()),
5989   _access_flags(),
5990   _pub_level(pub_level),
5991   _bad_constant_seen(0),
5992   _synthetic_flag(false),
5993   _sde_length(false),
5994   _sde_buffer(NULL),
5995   _sourcefile_index(0),
5996   _generic_signature_index(0),
5997   _major_version(0),
5998   _minor_version(0),
5999   _this_class_index(0),
6000   _super_class_index(0),
6001   _itfs_len(0),
6002   _java_fields_count(0),
6003   _need_verify(false),
6004   _relax_verify(false),
6005   _has_nonstatic_concrete_methods(false),
6006   _declares_nonstatic_concrete_methods(false),
6007   _has_final_method(false),
6008   _has_contended_fields(false),
6009   _has_inline_type_fields(false),
6010   _has_nonstatic_fields(false),
6011   _is_empty_inline_type(false),
6012   _is_naturally_atomic(false),
6013   _is_declared_atomic(false),
6014   _carries_value_modifier(false),
6015   _carries_identity_modifier(false),
6016   _has_finalizer(false),
6017   _has_empty_finalizer(false),
6018   _has_vanilla_constructor(false),
6019   _max_bootstrap_specifier_index(-1) {
6020 
6021   _class_name = name != NULL ? name : vmSymbols::unknown_class_name();
6022   _class_name->increment_refcount();
6023 
6024   assert(_loader_data != NULL, "invariant");
6025   assert(stream != NULL, "invariant");
6026   assert(_stream != NULL, "invariant");
6027   assert(_stream->buffer() == _stream->current(), "invariant");
6028   assert(_class_name != NULL, "invariant");
6029   assert(0 == _access_flags.as_int(), "invariant");
6030 
6031   // Figure out whether we can skip format checking (matching classic VM behavior)
6032   if (DumpSharedSpaces) {
6033     // verify == true means it's a 'remote' class (i.e., non-boot class)
6034     // Verification decision is based on BytecodeVerificationRemote flag
6035     // for those classes.

6045   stream->set_verify(_need_verify);
6046 
6047   // Check if verification needs to be relaxed for this class file
6048   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
6049   _relax_verify = relax_format_check_for(_loader_data);
6050 
6051   parse_stream(stream, CHECK);
6052 
6053   post_process_parsed_stream(stream, _cp, CHECK);
6054 }
6055 
6056 void ClassFileParser::clear_class_metadata() {
6057   // metadata created before the instance klass is created.  Must be
6058   // deallocated if classfile parsing returns an error.
6059   _cp = NULL;
6060   _fields = NULL;
6061   _methods = NULL;
6062   _inner_classes = NULL;
6063   _nest_members = NULL;
6064   _permitted_subclasses = NULL;
6065   _preload_classes = NULL;
6066   _combined_annotations = NULL;
6067   _class_annotations = _class_type_annotations = NULL;
6068   _fields_annotations = _fields_type_annotations = NULL;
6069   _record_components = NULL;
6070 }
6071 
6072 // Destructor to clean up
6073 ClassFileParser::~ClassFileParser() {
6074   _class_name->decrement_refcount();
6075 
6076   if (_cp != NULL) {
6077     MetadataFactory::free_metadata(_loader_data, _cp);
6078   }
6079   if (_fields != NULL) {
6080     MetadataFactory::free_array<u2>(_loader_data, _fields);
6081   }
6082 
6083   if (_inline_type_field_klasses != NULL) {
6084      MetadataFactory::free_array<InlineKlass*>(_loader_data, _inline_type_field_klasses);
6085   }
6086 
6087   if (_methods != NULL) {
6088     // Free methods
6089     InstanceKlass::deallocate_methods(_loader_data, _methods);
6090   }
6091 
6092   // beware of the Universe::empty_blah_array!!
6093   if (_inner_classes != NULL && _inner_classes != Universe::the_empty_short_array()) {
6094     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
6095   }
6096 
6097   if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
6098     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
6099   }
6100 
6101   if (_record_components != NULL) {
6102     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
6103   }
6104 
6105   if (_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array()) {
6106     MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
6107   }
6108 
6109   if (_preload_classes != NULL && _preload_classes != Universe::the_empty_short_array()) {
6110     MetadataFactory::free_array<u2>(_loader_data, _preload_classes);
6111   }
6112 
6113   // Free interfaces
6114   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
6115                                        _local_interfaces, _transitive_interfaces);
6116 
6117   if (_combined_annotations != NULL) {
6118     // After all annotations arrays have been created, they are installed into the
6119     // Annotations object that will be assigned to the InstanceKlass being created.
6120 
6121     // Deallocate the Annotations object and the installed annotations arrays.
6122     _combined_annotations->deallocate_contents(_loader_data);
6123 
6124     // If the _combined_annotations pointer is non-NULL,
6125     // then the other annotations fields should have been cleared.
6126     assert(_class_annotations       == NULL, "Should have been cleared");
6127     assert(_class_type_annotations  == NULL, "Should have been cleared");
6128     assert(_fields_annotations      == NULL, "Should have been cleared");
6129     assert(_fields_type_annotations == NULL, "Should have been cleared");
6130   } else {
6131     // If the annotations arrays were not installed into the Annotations object,
6132     // then they have to be deallocated explicitly.

6177     cp_size, CHECK);
6178 
6179   _orig_cp_size = cp_size;
6180   if (is_hidden()) { // Add a slot for hidden class name.
6181     cp_size++;
6182   }
6183 
6184   _cp = ConstantPool::allocate(_loader_data,
6185                                cp_size,
6186                                CHECK);
6187 
6188   ConstantPool* const cp = _cp;
6189 
6190   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
6191 
6192   assert(cp_size == (const u2)cp->length(), "invariant");
6193 
6194   // ACCESS FLAGS
6195   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
6196 
6197   jint recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;

6198   // JVM_ACC_MODULE is defined in JDK-9 and later.
6199   if (_major_version >= JAVA_9_VERSION) {
6200     recognized_modifiers |= JVM_ACC_MODULE;


6201   }
6202   // JVM_ACC_VALUE and JVM_ACC_PRIMITIVE supported version
6203   if (supports_inline_types()) {
6204     recognized_modifiers |= JVM_ACC_PRIMITIVE | JVM_ACC_VALUE;
6205   }
6206 
6207   // Access flags
6208   jint flags = stream->get_u2_fast() & recognized_modifiers;
6209 
6210   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
6211     // Set abstract bit for old class files for backward compatibility
6212     flags |= JVM_ACC_ABSTRACT;
6213   }
6214 












6215   // This class and superclass
6216   _this_class_index = stream->get_u2_fast();
6217   check_property(
6218     valid_cp_range(_this_class_index, cp_size) &&
6219       cp->tag_at(_this_class_index).is_unresolved_klass(),
6220     "Invalid this class index %u in constant pool in class file %s",
6221     _this_class_index, CHECK);
6222 
6223   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
6224   assert(class_name_in_cp != NULL, "class_name can't be null");
6225 
6226   bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
6227 
6228   verify_legal_class_modifiers(flags, NULL, is_java_lang_Object, CHECK);
6229 
6230   if (EnableValhalla) {
6231     if(!supports_inline_types()) {
6232       const bool is_module = (flags & JVM_ACC_MODULE) != 0;
6233       const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
6234       if (!is_module && !is_interface && !is_java_lang_Object) {
6235         flags |= JVM_ACC_IDENTITY;
6236       }
6237     }
6238   }
6239 
6240   _access_flags.set_flags(flags);
6241 
6242   if (EnableValhalla) {
6243     if (_access_flags.is_identity_class()) set_carries_identity_modifier();
6244     if (_access_flags.is_value_class()) set_carries_value_modifier();
6245     if (carries_identity_modifier() && carries_value_modifier()) {
6246       classfile_parse_error("Class %s has both ACC_IDENTITY and ACC_VALUE modifiers", THREAD);
6247     }
6248   }
6249 
6250   short bad_constant = class_bad_constant_seen();
6251   if (bad_constant != 0) {
6252     // Do not throw CFE until after the access_flags are checked because if
6253     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
6254     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
6255     return;
6256   }
6257 
6258   // Don't need to check whether this class name is legal or not.
6259   // It has been checked when constant pool is parsed.
6260   // However, make sure it is not an array type.
6261   if (_need_verify) {
6262     guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
6263                        "Bad class name in class file %s",
6264                        CHECK);
6265   }
6266 
6267 #ifdef ASSERT
6268   // Basic sanity checks
6269   if (_is_hidden) {
6270     assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
6271   }
6272 #endif
6273 
6274   // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
6275 
6276   if (_is_hidden) {
6277     assert(_class_name != NULL, "Unexpected null _class_name");

6315       if (stream->source() != NULL) {
6316         ls.print(" source: %s", stream->source());
6317       }
6318       ls.cr();
6319     }
6320   }
6321 
6322   // SUPERKLASS
6323   _super_class_index = stream->get_u2_fast();
6324   _super_klass = parse_super_class(cp,
6325                                    _super_class_index,
6326                                    _need_verify,
6327                                    CHECK);
6328 
6329   // Interfaces
6330   _itfs_len = stream->get_u2_fast();
6331   parse_interfaces(stream,
6332                    _itfs_len,
6333                    cp,
6334                    &_has_nonstatic_concrete_methods,
6335                    &_is_declared_atomic,
6336                    CHECK);
6337 


6338   // Fields (offsets are filled in later)
6339   _fac = new FieldAllocationCount();
6340   parse_fields(stream,
6341                _access_flags,
6342                _fac,
6343                cp,
6344                cp_size,
6345                &_java_fields_count,
6346                CHECK);
6347 
6348   assert(_fields != NULL, "invariant");
6349 
6350   // Methods
6351   AccessFlags promoted_flags;
6352   parse_methods(stream,
6353                 is_interface(),
6354                 is_value_class(),
6355                 is_abstract_class(),
6356                 &promoted_flags,
6357                 &_has_final_method,
6358                 &_declares_nonstatic_concrete_methods,
6359                 CHECK);
6360 
6361   assert(_methods != NULL, "invariant");
6362 
6363   // promote flags from parse_methods() to the klass' flags
6364   _access_flags.add_promoted_flags(promoted_flags.as_int());
6365 
6366   if (_declares_nonstatic_concrete_methods) {
6367     _has_nonstatic_concrete_methods = true;
6368   }
6369 
6370   // Additional attributes/annotations
6371   _parsed_annotations = new ClassAnnotationCollector();
6372   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6373 
6374   assert(_inner_classes != NULL, "invariant");
6375 

6418   // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6419   // We have to update the resolved_klass_index and the name_index together
6420   // so extract the existing resolved_klass_index first.
6421   CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6422   int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6423   _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6424   assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6425          "Bad name_index");
6426 }
6427 
6428 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6429                                                  ConstantPool* cp,
6430                                                  TRAPS) {
6431   assert(stream != NULL, "invariant");
6432   assert(stream->at_eos(), "invariant");
6433   assert(cp != NULL, "invariant");
6434   assert(_loader_data != NULL, "invariant");
6435 
6436   if (_class_name == vmSymbols::java_lang_Object()) {
6437     check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6438         "java.lang.Object cannot implement an interface in class file %s",
6439         CHECK);
6440   }
6441   // We check super class after class file is parsed and format is checked
6442   if (_super_class_index > 0 && NULL == _super_klass) {
6443     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6444     if (is_interface()) {
6445       // Before attempting to resolve the superclass, check for class format
6446       // errors not checked yet.
6447       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6448         "Interfaces must have java.lang.Object as superclass in class file %s",
6449         CHECK);
6450     }
6451     Handle loader(THREAD, _loader_data->class_loader());
6452     _super_klass = (const InstanceKlass*)
6453                        SystemDictionary::resolve_super_or_fail(_class_name,
6454                                                                super_class_name,
6455                                                                loader,
6456                                                                _protection_domain,
6457                                                                true,
6458                                                                CHECK);
6459   }
6460 
6461   if (_super_klass != NULL) {
6462     if (_super_klass->is_interface()) {
6463       classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6464       return;
6465     }
6466 
6467     if (EnableValhalla) {
6468       check_identity_and_value_modifiers(this, _super_klass, CHECK);
6469     }
6470 
6471     if (_super_klass->has_nonstatic_concrete_methods()) {
6472       _has_nonstatic_concrete_methods = true;
6473     }
6474     if (_super_klass->is_declared_atomic()) {
6475       _is_declared_atomic = true;
6476     }
6477   }
6478 
6479   if (*ForceNonTearable != '\0') {
6480     // Allow a command line switch to force the same atomicity property:
6481     const char* class_name_str = _class_name->as_C_string();
6482     if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6483       _is_declared_atomic = true;
6484     }
6485   }
6486 
6487   int itfs_len = _local_interface_indexes == NULL ? 0 : _local_interface_indexes->length();
6488   _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, NULL, CHECK);
6489   if (_local_interface_indexes != NULL) {
6490     for (int i = 0; i < _local_interface_indexes->length(); i++) {
6491       u2 interface_index = _local_interface_indexes->at(i);
6492       Klass* interf;
6493       if (cp->tag_at(interface_index).is_klass()) {
6494         interf = cp->resolved_klass_at(interface_index);
6495       } else {
6496         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
6497 
6498         // Don't need to check legal name because it's checked when parsing constant pool.
6499         // But need to make sure it's not an array type.
6500         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6501                             "Bad interface name in class file %s", CHECK);
6502 
6503         // Call resolve_super so class circularity is checked
6504         interf = SystemDictionary::resolve_super_or_fail(
6505                                                   _class_name,
6506                                                   unresolved_klass,
6507                                                   Handle(THREAD, _loader_data->class_loader()),
6508                                                   _protection_domain,
6509                                                   false,
6510                                                   CHECK);
6511       }
6512 
6513       if (!interf->is_interface()) {
6514         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6515                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
6516                           _class_name->as_klass_external_name(),
6517                           interf->external_name(),
6518                           interf->class_in_module_of_loader()));
6519       }
6520 
6521       if (EnableValhalla) {
6522         // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6523         check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6524       }
6525 
6526       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6527         _has_nonstatic_concrete_methods = true;
6528       }
6529       if (InstanceKlass::cast(interf)->is_declared_atomic()) {
6530         _is_declared_atomic = true;
6531       }
6532       _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6533     }
6534   }
6535   assert(_local_interfaces != NULL, "invariant");
6536 
6537   // Compute the transitive list of all unique interfaces implemented by this class
6538   _transitive_interfaces =
6539     compute_transitive_interfaces(_super_klass,
6540                                   _local_interfaces,
6541                                   _loader_data,
6542                                   CHECK);
6543 
6544   assert(_transitive_interfaces != NULL, "invariant");
6545 
6546   // sort methods
6547   _method_ordering = sort_methods(_methods);
6548 
6549   _all_mirandas = new GrowableArray<Method*>(20);
6550 
6551   Handle loader(THREAD, _loader_data->class_loader());
6552   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6553                                                     &_num_miranda_methods,
6554                                                     _all_mirandas,
6555                                                     _super_klass,
6556                                                     _methods,
6557                                                     _access_flags,
6558                                                     _major_version,
6559                                                     loader,
6560                                                     _class_name,
6561                                                     _local_interfaces);
6562 
6563   // Size of Java itable (in words)
6564   _itable_size = is_interface() ? 0 :
6565     klassItable::compute_itable_size(_transitive_interfaces);
6566 
6567   assert(_fac != NULL, "invariant");
6568   assert(_parsed_annotations != NULL, "invariant");
6569 
6570 
6571   if (EnablePrimitiveClasses) {
6572     _inline_type_field_klasses = MetadataFactory::new_array<InlineKlass*>(_loader_data,
6573                                                    java_fields_count(),
6574                                                    NULL,
6575                                                    CHECK);
6576     for (AllFieldStream fs(_fields, cp); !fs.done(); fs.next()) {
6577       if (Signature::basic_type(fs.signature()) == T_PRIMITIVE_OBJECT && !fs.access_flags().is_static()) {
6578         // Pre-load inline class
6579         Klass* klass = SystemDictionary::resolve_inline_type_field_or_fail(&fs,
6580             Handle(THREAD, _loader_data->class_loader()),
6581             _protection_domain, true, CHECK);
6582         assert(klass != NULL, "Sanity check");
6583         if (!klass->access_flags().is_value_class()) {
6584           assert(klass->is_instance_klass(), "Sanity check");
6585           ResourceMark rm(THREAD);
6586             THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6587                       err_msg("Class %s expects class %s to be an inline type, but it is not",
6588                       _class_name->as_C_string(),
6589                       InstanceKlass::cast(klass)->external_name()));
6590         }
6591         _inline_type_field_klasses->at_put(fs.index(), InlineKlass::cast(klass));
6592       }
6593     }
6594   }
6595 
6596   _field_info = new FieldLayoutInfo();
6597   FieldLayoutBuilder lb(class_name(), super_klass(), _cp, _fields,
6598       _parsed_annotations->is_contended(), is_inline_type(),
6599       _field_info, _inline_type_field_klasses);
6600   lb.build_layout(CHECK);
6601   if (is_inline_type()) {
6602     _alignment = lb.get_alignment();
6603     _first_field_offset = lb.get_first_field_offset();
6604     _exact_size_in_bytes = lb.get_exact_size_in_byte();
6605   }
6606   _has_inline_type_fields = _field_info->_has_inline_fields;
6607 }
6608 
6609 void ClassFileParser::set_klass(InstanceKlass* klass) {
6610 
6611 #ifdef ASSERT
6612   if (klass != NULL) {
6613     assert(NULL == _klass, "leaking?");
6614   }
6615 #endif
6616 
6617   _klass = klass;
6618 }
6619 
6620 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6621 
6622 #ifdef ASSERT
6623   if (klass != NULL) {
6624     assert(NULL == _klass_to_deallocate, "leaking?");
6625   }
6626 #endif
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