1 /*
   2  * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   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 "cds/cdsConfig.hpp"
  26 #include "classfile/classFileParser.hpp"
  27 #include "classfile/classFileStream.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderData.inline.hpp"
  30 #include "classfile/classLoadInfo.hpp"
  31 #include "classfile/defaultMethods.hpp"
  32 #include "classfile/fieldLayoutBuilder.hpp"
  33 #include "classfile/javaClasses.inline.hpp"
  34 #include "classfile/moduleEntry.hpp"
  35 #include "classfile/packageEntry.hpp"
  36 #include "classfile/symbolTable.hpp"
  37 #include "classfile/systemDictionary.hpp"
  38 #include "classfile/verificationType.hpp"
  39 #include "classfile/verifier.hpp"
  40 #include "classfile/vmClasses.hpp"
  41 #include "classfile/vmSymbols.hpp"
  42 #include "jvm.h"
  43 #include "logging/log.hpp"
  44 #include "logging/logStream.hpp"
  45 #include "memory/allocation.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/oopFactory.hpp"
  48 #include "memory/resourceArea.hpp"
  49 #include "memory/universe.hpp"
  50 #include "oops/annotations.hpp"
  51 #include "oops/constantPool.inline.hpp"
  52 #include "oops/fieldInfo.hpp"
  53 #include "oops/fieldStreams.inline.hpp"
  54 #include "oops/instanceKlass.inline.hpp"
  55 #include "oops/instanceMirrorKlass.hpp"
  56 #include "oops/klass.inline.hpp"
  57 #include "oops/klassVtable.hpp"
  58 #include "oops/metadata.hpp"
  59 #include "oops/method.inline.hpp"
  60 #include "oops/oop.inline.hpp"
  61 #include "oops/recordComponent.hpp"
  62 #include "oops/symbol.hpp"
  63 #include "prims/jvmtiExport.hpp"
  64 #include "prims/jvmtiThreadState.hpp"
  65 #include "runtime/arguments.hpp"
  66 #include "runtime/fieldDescriptor.inline.hpp"
  67 #include "runtime/handles.inline.hpp"
  68 #include "runtime/javaCalls.hpp"
  69 #include "runtime/os.hpp"
  70 #include "runtime/perfData.hpp"
  71 #include "runtime/reflection.hpp"
  72 #include "runtime/safepointVerifiers.hpp"
  73 #include "runtime/signature.hpp"
  74 #include "runtime/timer.hpp"
  75 #include "services/classLoadingService.hpp"
  76 #include "services/threadService.hpp"
  77 #include "utilities/align.hpp"
  78 #include "utilities/bitMap.inline.hpp"
  79 #include "utilities/checkedCast.hpp"
  80 #include "utilities/copy.hpp"
  81 #include "utilities/formatBuffer.hpp"
  82 #include "utilities/exceptions.hpp"
  83 #include "utilities/globalDefinitions.hpp"
  84 #include "utilities/growableArray.hpp"
  85 #include "utilities/macros.hpp"
  86 #include "utilities/ostream.hpp"
  87 #include "utilities/resourceHash.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:
 108 // - to check for new additions to the class file format in JDK1.5
 109 // - to check for bug fixes in the format checker in JDK1.5
 110 #define JAVA_1_5_VERSION                  49
 111 
 112 // Used for backward compatibility reasons:
 113 // - to check for javac bug fixes that happened after 1.5
 114 // - also used as the max version when running in jdk6
 115 #define JAVA_6_VERSION                    50
 116 
 117 // Used for backward compatibility reasons:
 118 // - to disallow argument and require ACC_STATIC for <clinit> methods
 119 #define JAVA_7_VERSION                    51
 120 
 121 // Extension method support.
 122 #define JAVA_8_VERSION                    52
 123 
 124 #define JAVA_9_VERSION                    53
 125 
 126 #define JAVA_10_VERSION                   54
 127 
 128 #define JAVA_11_VERSION                   55
 129 
 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 JAVA_22_VERSION                   66
 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 != nullptr, "invariant");
 164   assert(cp != nullptr, "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: {
 211         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 212         const u2 class_index = cfs->get_u2_fast();
 213         const u2 name_and_type_index = cfs->get_u2_fast();
 214         cp->interface_method_at_put(index, class_index, name_and_type_index);
 215         break;
 216       }
 217       case JVM_CONSTANT_String : {
 218         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 219         const u2 string_index = cfs->get_u2_fast();
 220         cp->string_index_at_put(index, string_index);
 221         break;
 222       }
 223       case JVM_CONSTANT_MethodHandle :
 224       case JVM_CONSTANT_MethodType: {
 225         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 226           classfile_parse_error(
 227             "Class file version does not support constant tag %u in class file %s",
 228             tag, THREAD);
 229           return;
 230         }
 231         if (tag == JVM_CONSTANT_MethodHandle) {
 232           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 233           const u1 ref_kind = cfs->get_u1_fast();
 234           const u2 method_index = cfs->get_u2_fast();
 235           cp->method_handle_index_at_put(index, ref_kind, method_index);
 236         }
 237         else if (tag == JVM_CONSTANT_MethodType) {
 238           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 239           const u2 signature_index = cfs->get_u2_fast();
 240           cp->method_type_index_at_put(index, signature_index);
 241         }
 242         else {
 243           ShouldNotReachHere();
 244         }
 245         break;
 246       }
 247       case JVM_CONSTANT_Dynamic : {
 248         if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
 249           classfile_parse_error(
 250               "Class file version does not support constant tag %u in class file %s",
 251               tag, THREAD);
 252           return;
 253         }
 254         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 255         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 256         const u2 name_and_type_index = cfs->get_u2_fast();
 257         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 258           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 259         }
 260         cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
 261         break;
 262       }
 263       case JVM_CONSTANT_InvokeDynamic : {
 264         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 265           classfile_parse_error(
 266               "Class file version does not support constant tag %u in class file %s",
 267               tag, THREAD);
 268           return;
 269         }
 270         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 271         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 272         const u2 name_and_type_index = cfs->get_u2_fast();
 273         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 274           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 275         }
 276         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 277         break;
 278       }
 279       case JVM_CONSTANT_Integer: {
 280         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 281         const u4 bytes = cfs->get_u4_fast();
 282         cp->int_at_put(index, (jint)bytes);
 283         break;
 284       }
 285       case JVM_CONSTANT_Float: {
 286         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 287         const u4 bytes = cfs->get_u4_fast();
 288         cp->float_at_put(index, *(jfloat*)&bytes);
 289         break;
 290       }
 291       case JVM_CONSTANT_Long: {
 292         // A mangled type might cause you to overrun allocated memory
 293         guarantee_property(index + 1 < length,
 294                            "Invalid constant pool entry %u in class file %s",
 295                            index,
 296                            CHECK);
 297         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 298         const u8 bytes = cfs->get_u8_fast();
 299         cp->long_at_put(index, bytes);
 300         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 301         break;
 302       }
 303       case JVM_CONSTANT_Double: {
 304         // A mangled type might cause you to overrun allocated memory
 305         guarantee_property(index+1 < length,
 306                            "Invalid constant pool entry %u in class file %s",
 307                            index,
 308                            CHECK);
 309         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 310         const u8 bytes = cfs->get_u8_fast();
 311         cp->double_at_put(index, *(jdouble*)&bytes);
 312         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 313         break;
 314       }
 315       case JVM_CONSTANT_NameAndType: {
 316         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 317         const u2 name_index = cfs->get_u2_fast();
 318         const u2 signature_index = cfs->get_u2_fast();
 319         cp->name_and_type_at_put(index, name_index, signature_index);
 320         break;
 321       }
 322       case JVM_CONSTANT_Utf8 : {
 323         cfs->guarantee_more(2, CHECK);  // utf8_length
 324         u2  utf8_length = cfs->get_u2_fast();
 325         const u1* utf8_buffer = cfs->current();
 326         assert(utf8_buffer != nullptr, "null utf8 buffer");
 327         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 328         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 329         cfs->skip_u1_fast(utf8_length);
 330 
 331         // Before storing the symbol, make sure it's legal
 332         if (_need_verify) {
 333           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 334         }
 335 
 336         unsigned int hash;
 337         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 338                                                         utf8_length,
 339                                                         hash);
 340         if (result == nullptr) {
 341           names[names_count] = (const char*)utf8_buffer;
 342           lengths[names_count] = utf8_length;
 343           indices[names_count] = index;
 344           hashValues[names_count++] = hash;
 345           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 346             SymbolTable::new_symbols(_loader_data,
 347                                      constantPoolHandle(THREAD, cp),
 348                                      names_count,
 349                                      names,
 350                                      lengths,
 351                                      indices,
 352                                      hashValues);
 353             names_count = 0;
 354           }
 355         } else {
 356           cp->symbol_at_put(index, result);
 357         }
 358         break;
 359       }
 360       case JVM_CONSTANT_Module:
 361       case JVM_CONSTANT_Package: {
 362         // Record that an error occurred in these two cases but keep parsing so
 363         // that ACC_Module can be checked for in the access_flags.  Need to
 364         // throw NoClassDefFoundError in that case.
 365         if (_major_version >= JAVA_9_VERSION) {
 366           cfs->guarantee_more(3, CHECK);
 367           cfs->get_u2_fast();
 368           set_class_bad_constant_seen(tag);
 369           break;
 370         }
 371       }
 372       default: {
 373         classfile_parse_error("Unknown constant tag %u in class file %s",
 374                               tag,
 375                               THREAD);
 376         return;
 377       }
 378     } // end of switch(tag)
 379   } // end of for
 380 
 381   // Allocate the remaining symbols
 382   if (names_count > 0) {
 383     SymbolTable::new_symbols(_loader_data,
 384                              constantPoolHandle(THREAD, cp),
 385                              names_count,
 386                              names,
 387                              lengths,
 388                              indices,
 389                              hashValues);
 390   }
 391 
 392   // Copy _current pointer of local copy back to stream.
 393   assert(stream->current() == old_current, "non-exclusive use of stream");
 394   stream->set_current(cfs1.current());
 395 
 396 }
 397 
 398 static inline bool valid_cp_range(int index, int length) {
 399   return (index > 0 && index < length);
 400 }
 401 
 402 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 403   assert(cp != nullptr, "invariant");
 404   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 405     return cp->symbol_at(index);
 406   }
 407   return nullptr;
 408 }
 409 
 410 #ifdef ASSERT
 411 PRAGMA_DIAG_PUSH
 412 PRAGMA_FORMAT_NONLITERAL_IGNORED
 413 void ClassFileParser::report_assert_property_failure(const char* msg, TRAPS) const {
 414   ResourceMark rm(THREAD);
 415   fatal(msg, _class_name->as_C_string());
 416 }
 417 
 418 void ClassFileParser::report_assert_property_failure(const char* msg,
 419                                                      int index,
 420                                                      TRAPS) const {
 421   ResourceMark rm(THREAD);
 422   fatal(msg, index, _class_name->as_C_string());
 423 }
 424 PRAGMA_DIAG_POP
 425 #endif
 426 
 427 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 428                                          ConstantPool* const cp,
 429                                          const int length,
 430                                          TRAPS) {
 431   assert(cp != nullptr, "invariant");
 432   assert(stream != nullptr, "invariant");
 433 
 434   // parsing constant pool entries
 435   parse_constant_pool_entries(stream, cp, length, CHECK);
 436   if (class_bad_constant_seen() != 0) {
 437     // a bad CP entry has been detected previously so stop parsing and just return.
 438     return;
 439   }
 440 
 441   int index = 1;  // declared outside of loops for portability
 442   int num_klasses = 0;
 443 
 444   // first verification pass - validate cross references
 445   // and fixup class and string constants
 446   for (index = 1; index < length; index++) {          // Index 0 is unused
 447     const jbyte tag = cp->tag_at(index).value();
 448     switch (tag) {
 449       case JVM_CONSTANT_Class: {
 450         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 451         break;
 452       }
 453       case JVM_CONSTANT_Fieldref:
 454         // fall through
 455       case JVM_CONSTANT_Methodref:
 456         // fall through
 457       case JVM_CONSTANT_InterfaceMethodref: {
 458         if (!_need_verify) break;
 459         const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
 460         const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
 461         check_property(valid_klass_reference_at(klass_ref_index),
 462                        "Invalid constant pool index %u in class file %s",
 463                        klass_ref_index, CHECK);
 464         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 465           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 466           "Invalid constant pool index %u in class file %s",
 467           name_and_type_ref_index, CHECK);
 468         break;
 469       }
 470       case JVM_CONSTANT_String: {
 471         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 472         break;
 473       }
 474       case JVM_CONSTANT_Integer:
 475         break;
 476       case JVM_CONSTANT_Float:
 477         break;
 478       case JVM_CONSTANT_Long:
 479       case JVM_CONSTANT_Double: {
 480         index++;
 481         check_property(
 482           (index < length && cp->tag_at(index).is_invalid()),
 483           "Improper constant pool long/double index %u in class file %s",
 484           index, CHECK);
 485         break;
 486       }
 487       case JVM_CONSTANT_NameAndType: {
 488         if (!_need_verify) break;
 489         const int name_ref_index = cp->name_ref_index_at(index);
 490         const int signature_ref_index = cp->signature_ref_index_at(index);
 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         cp->unresolved_klass_at_put(index, class_index, num_klasses++);
 512         break;
 513       }
 514       case JVM_CONSTANT_StringIndex: {
 515         const int string_index = cp->string_index_at(index);
 516         check_property(valid_symbol_at(string_index),
 517           "Invalid constant pool index %u in class file %s",
 518           string_index, CHECK);
 519         Symbol* const sym = cp->symbol_at(string_index);
 520         cp->unresolved_string_at_put(index, sym);
 521         break;
 522       }
 523       case JVM_CONSTANT_MethodHandle: {
 524         const int ref_index = cp->method_handle_index_at(index);
 525         check_property(valid_cp_range(ref_index, length),
 526           "Invalid constant pool index %u in class file %s",
 527           ref_index, CHECK);
 528         const constantTag tag = cp->tag_at(ref_index);
 529         const int ref_kind = cp->method_handle_ref_kind_at(index);
 530 
 531         switch (ref_kind) {
 532           case JVM_REF_getField:
 533           case JVM_REF_getStatic:
 534           case JVM_REF_putField:
 535           case JVM_REF_putStatic: {
 536             check_property(
 537               tag.is_field(),
 538               "Invalid constant pool index %u in class file %s (not a field)",
 539               ref_index, CHECK);
 540             break;
 541           }
 542           case JVM_REF_invokeVirtual:
 543           case JVM_REF_newInvokeSpecial: {
 544             check_property(
 545               tag.is_method(),
 546               "Invalid constant pool index %u in class file %s (not a method)",
 547               ref_index, CHECK);
 548             break;
 549           }
 550           case JVM_REF_invokeStatic:
 551           case JVM_REF_invokeSpecial: {
 552             check_property(
 553               tag.is_method() ||
 554               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 555               "Invalid constant pool index %u in class file %s (not a method)",
 556               ref_index, CHECK);
 557             break;
 558           }
 559           case JVM_REF_invokeInterface: {
 560             check_property(
 561               tag.is_interface_method(),
 562               "Invalid constant pool index %u in class file %s (not an interface method)",
 563               ref_index, CHECK);
 564             break;
 565           }
 566           default: {
 567             classfile_parse_error(
 568               "Bad method handle kind at constant pool index %u in class file %s",
 569               index, THREAD);
 570             return;
 571           }
 572         } // switch(refkind)
 573         // Keep the ref_index unchanged.  It will be indirected at link-time.
 574         break;
 575       } // case MethodHandle
 576       case JVM_CONSTANT_MethodType: {
 577         const int ref_index = cp->method_type_index_at(index);
 578         check_property(valid_symbol_at(ref_index),
 579           "Invalid constant pool index %u in class file %s",
 580           ref_index, CHECK);
 581         break;
 582       }
 583       case JVM_CONSTANT_Dynamic: {
 584         const int name_and_type_ref_index =
 585           cp->bootstrap_name_and_type_ref_index_at(index);
 586 
 587         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 588           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 589           "Invalid constant pool index %u in class file %s",
 590           name_and_type_ref_index, CHECK);
 591         // bootstrap specifier index must be checked later,
 592         // when BootstrapMethods attr is available
 593 
 594         // Mark the constant pool as having a CONSTANT_Dynamic_info structure
 595         cp->set_has_dynamic_constant();
 596         break;
 597       }
 598       case JVM_CONSTANT_InvokeDynamic: {
 599         const int name_and_type_ref_index =
 600           cp->bootstrap_name_and_type_ref_index_at(index);
 601 
 602         check_property(valid_cp_range(name_and_type_ref_index, length) &&
 603           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 604           "Invalid constant pool index %u in class file %s",
 605           name_and_type_ref_index, CHECK);
 606         // bootstrap specifier index must be checked later,
 607         // when BootstrapMethods attr is available
 608         break;
 609       }
 610       default: {
 611         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 612         ShouldNotReachHere();
 613         break;
 614       }
 615     } // switch(tag)
 616   } // end of for
 617 
 618   cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
 619 
 620   if (!_need_verify) {
 621     return;
 622   }
 623 
 624   // second verification pass - checks the strings are of the right format.
 625   // but not yet to the other entries
 626   for (index = 1; index < length; index++) {
 627     const jbyte tag = cp->tag_at(index).value();
 628     switch (tag) {
 629       case JVM_CONSTANT_UnresolvedClass: {
 630         const Symbol* const class_name = cp->klass_name_at(index);
 631         // check the name
 632         verify_legal_class_name(class_name, CHECK);
 633         break;
 634       }
 635       case JVM_CONSTANT_NameAndType: {
 636         if (_need_verify) {
 637           const int sig_index = cp->signature_ref_index_at(index);
 638           const int name_index = cp->name_ref_index_at(index);
 639           const Symbol* const name = cp->symbol_at(name_index);
 640           const Symbol* const sig = cp->symbol_at(sig_index);
 641           guarantee_property(sig->utf8_length() != 0,
 642             "Illegal zero length constant pool entry at %d in class %s",
 643             sig_index, CHECK);
 644           guarantee_property(name->utf8_length() != 0,
 645             "Illegal zero length constant pool entry at %d in class %s",
 646             name_index, CHECK);
 647 
 648           if (Signature::is_method(sig)) {
 649             // Format check method name and signature
 650             verify_legal_method_name(name, CHECK);
 651             verify_legal_method_signature(name, sig, CHECK);
 652           } else {
 653             // Format check field name and signature
 654             verify_legal_field_name(name, CHECK);
 655             verify_legal_field_signature(name, sig, CHECK);
 656           }
 657         }
 658         break;
 659       }
 660       case JVM_CONSTANT_Dynamic: {
 661         const int name_and_type_ref_index =
 662           cp->uncached_name_and_type_ref_index_at(index);
 663         // already verified to be utf8
 664         const int name_ref_index =
 665           cp->name_ref_index_at(name_and_type_ref_index);
 666         // already verified to be utf8
 667         const int signature_ref_index =
 668           cp->signature_ref_index_at(name_and_type_ref_index);
 669         const Symbol* const name = cp->symbol_at(name_ref_index);
 670         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 671         if (_need_verify) {
 672           // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
 673           // Need only to be sure signature is the right type.
 674           if (Signature::is_method(signature)) {
 675             throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
 676           }
 677         }
 678         break;
 679       }
 680       case JVM_CONSTANT_InvokeDynamic:
 681       case JVM_CONSTANT_Fieldref:
 682       case JVM_CONSTANT_Methodref:
 683       case JVM_CONSTANT_InterfaceMethodref: {
 684         const int name_and_type_ref_index =
 685           cp->uncached_name_and_type_ref_index_at(index);
 686         // already verified to be utf8
 687         const int name_ref_index =
 688           cp->name_ref_index_at(name_and_type_ref_index);
 689         // already verified to be utf8
 690         const int signature_ref_index =
 691           cp->signature_ref_index_at(name_and_type_ref_index);
 692         const Symbol* const name = cp->symbol_at(name_ref_index);
 693         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 694         if (tag == JVM_CONSTANT_Fieldref) {
 695           if (_need_verify) {
 696             // Field name and signature are verified above, when iterating NameAndType_info.
 697             // Need only to be sure signature is non-zero length and the right type.
 698             if (Signature::is_method(signature)) {
 699               throwIllegalSignature("Field", name, signature, CHECK);
 700             }
 701           }
 702         } else {
 703           if (_need_verify) {
 704             // Method name and signature are individually verified above, when iterating
 705             // NameAndType_info.  Need to check here that signature is non-zero length and
 706             // the right type.
 707             if (!Signature::is_method(signature)) {
 708               throwIllegalSignature("Method", name, signature, CHECK);
 709             }
 710           }
 711           // If a class method name begins with '<', it must be "<init>" and have void signature.
 712           const unsigned int name_len = name->utf8_length();
 713           if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
 714               name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
 715             if (name != vmSymbols::object_initializer_name()) {
 716               classfile_parse_error(
 717                 "Bad method name at constant pool index %u in class file %s",
 718                 name_ref_index, THREAD);
 719               return;
 720             } else if (!Signature::is_void_method(signature)) { // must have void signature.
 721               throwIllegalSignature("Method", name, signature, CHECK);
 722             }
 723           }
 724         }
 725         break;
 726       }
 727       case JVM_CONSTANT_MethodHandle: {
 728         const int ref_index = cp->method_handle_index_at(index);
 729         const int ref_kind = cp->method_handle_ref_kind_at(index);
 730         switch (ref_kind) {
 731           case JVM_REF_invokeVirtual:
 732           case JVM_REF_invokeStatic:
 733           case JVM_REF_invokeSpecial:
 734           case JVM_REF_newInvokeSpecial: {
 735             const int name_and_type_ref_index =
 736               cp->uncached_name_and_type_ref_index_at(ref_index);
 737             const int name_ref_index =
 738               cp->name_ref_index_at(name_and_type_ref_index);
 739             const Symbol* const name = cp->symbol_at(name_ref_index);
 740             if (ref_kind == JVM_REF_newInvokeSpecial) {
 741               if (name != vmSymbols::object_initializer_name()) {
 742                 classfile_parse_error(
 743                   "Bad constructor name at constant pool index %u in class file %s",
 744                     name_ref_index, THREAD);
 745                 return;
 746               }
 747             } else {
 748               if (name == vmSymbols::object_initializer_name()) {
 749                 classfile_parse_error(
 750                   "Bad method name at constant pool index %u in class file %s",
 751                   name_ref_index, THREAD);
 752                 return;
 753               }
 754             }
 755             break;
 756           }
 757           // Other ref_kinds are already fully checked in previous pass.
 758         } // switch(ref_kind)
 759         break;
 760       }
 761       case JVM_CONSTANT_MethodType: {
 762         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 763         const Symbol* const signature = cp->method_type_signature_at(index);
 764         verify_legal_method_signature(no_name, signature, CHECK);
 765         break;
 766       }
 767       case JVM_CONSTANT_Utf8: {
 768         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 769       }
 770     }  // switch(tag)
 771   }  // end of for
 772 }
 773 
 774 class NameSigHash: public ResourceObj {
 775  public:
 776   const Symbol*       _name;       // name
 777   const Symbol*       _sig;        // signature
 778 
 779   static const int HASH_ROW_SIZE = 256;
 780 
 781   NameSigHash(Symbol* name, Symbol* sig) :
 782     _name(name),
 783     _sig(sig) {}
 784 
 785   static unsigned int hash(NameSigHash const& namesig) {
 786     return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
 787   }
 788 
 789   static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
 790     return (e0._name == e1._name) &&
 791           (e0._sig  == e1._sig);
 792   }
 793 };
 794 
 795 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
 796                                            NameSigHash::HASH_ROW_SIZE,
 797                                            AnyObj::RESOURCE_AREA, mtInternal,
 798                                            &NameSigHash::hash, &NameSigHash::equals>;
 799 
 800 // Side-effects: populates the _local_interfaces field
 801 void ClassFileParser::parse_interfaces(const ClassFileStream* const stream,
 802                                        const int itfs_len,
 803                                        ConstantPool* const cp,
 804                                        bool* const has_nonstatic_concrete_methods,
 805                                        TRAPS) {
 806   assert(stream != nullptr, "invariant");
 807   assert(cp != nullptr, "invariant");
 808   assert(has_nonstatic_concrete_methods != nullptr, "invariant");
 809 
 810   if (itfs_len == 0) {
 811     _local_interfaces = Universe::the_empty_instance_klass_array();
 812   } else {
 813     assert(itfs_len > 0, "only called for len>0");
 814     _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
 815 
 816     int index;
 817     for (index = 0; index < itfs_len; index++) {
 818       const u2 interface_index = stream->get_u2(CHECK);
 819       Klass* interf;
 820       check_property(
 821         valid_klass_reference_at(interface_index),
 822         "Interface name has bad constant pool index %u in class file %s",
 823         interface_index, CHECK);
 824       if (cp->tag_at(interface_index).is_klass()) {
 825         interf = cp->resolved_klass_at(interface_index);
 826       } else {
 827         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
 828 
 829         // Don't need to check legal name because it's checked when parsing constant pool.
 830         // But need to make sure it's not an array type.
 831         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
 832                            "Bad interface name in class file %s", CHECK);
 833 
 834         // Call resolve_super so class circularity is checked
 835         interf = SystemDictionary::resolve_super_or_fail(
 836                                                   _class_name,
 837                                                   unresolved_klass,
 838                                                   Handle(THREAD, _loader_data->class_loader()),
 839                                                   _protection_domain,
 840                                                   false,
 841                                                   CHECK);
 842       }
 843 
 844       if (!interf->is_interface()) {
 845         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 846                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
 847                           _class_name->as_klass_external_name(),
 848                           interf->external_name(),
 849                           interf->class_in_module_of_loader()));
 850       }
 851 
 852       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
 853         *has_nonstatic_concrete_methods = true;
 854       }
 855       _local_interfaces->at_put(index, InstanceKlass::cast(interf));
 856     }
 857 
 858     if (!_need_verify || itfs_len <= 1) {
 859       return;
 860     }
 861 
 862     // Check if there's any duplicates in interfaces
 863     ResourceMark rm(THREAD);
 864     // Set containing interface names
 865     ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
 866     for (index = 0; index < itfs_len; index++) {
 867       const InstanceKlass* const k = _local_interfaces->at(index);
 868       Symbol* interface_name = k->name();
 869       // If no duplicates, add (name, nullptr) in hashtable interface_names.
 870       if (!interface_names->put(interface_name, 0)) {
 871         classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
 872                                interface_name->as_C_string(), THREAD);
 873         return;
 874       }
 875     }
 876   }
 877 }
 878 
 879 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 880                                            int constantvalue_index,
 881                                            int signature_index,
 882                                            TRAPS) const {
 883   // Make sure the constant pool entry is of a type appropriate to this field
 884   guarantee_property(
 885     (constantvalue_index > 0 &&
 886       constantvalue_index < cp->length()),
 887     "Bad initial value index %u in ConstantValue attribute in class file %s",
 888     constantvalue_index, CHECK);
 889 
 890   const constantTag value_type = cp->tag_at(constantvalue_index);
 891   switch(cp->basic_type_for_signature_at(signature_index)) {
 892     case T_LONG: {
 893       guarantee_property(value_type.is_long(),
 894                          "Inconsistent constant value type in class file %s",
 895                          CHECK);
 896       break;
 897     }
 898     case T_FLOAT: {
 899       guarantee_property(value_type.is_float(),
 900                          "Inconsistent constant value type in class file %s",
 901                          CHECK);
 902       break;
 903     }
 904     case T_DOUBLE: {
 905       guarantee_property(value_type.is_double(),
 906                          "Inconsistent constant value type in class file %s",
 907                          CHECK);
 908       break;
 909     }
 910     case T_BYTE:
 911     case T_CHAR:
 912     case T_SHORT:
 913     case T_BOOLEAN:
 914     case T_INT: {
 915       guarantee_property(value_type.is_int(),
 916                          "Inconsistent constant value type in class file %s",
 917                          CHECK);
 918       break;
 919     }
 920     case T_OBJECT: {
 921       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 922                          && value_type.is_string()),
 923                          "Bad string initial value in class file %s",
 924                          CHECK);
 925       break;
 926     }
 927     default: {
 928       classfile_parse_error("Unable to set initial value %u in class file %s",
 929                              constantvalue_index,
 930                              THREAD);
 931     }
 932   }
 933 }
 934 
 935 class AnnotationCollector : public ResourceObj{
 936 public:
 937   enum Location { _in_field, _in_method, _in_class };
 938   enum ID {
 939     _unknown = 0,
 940     _method_CallerSensitive,
 941     _method_ForceInline,
 942     _method_DontInline,
 943     _method_ChangesCurrentThread,
 944     _method_JvmtiMountTransition,
 945     _method_InjectedProfile,
 946     _method_LambdaForm_Compiled,
 947     _method_Hidden,
 948     _method_Scoped,
 949     _method_IntrinsicCandidate,
 950     _jdk_internal_vm_annotation_Contended,
 951     _field_Stable,
 952     _jdk_internal_vm_annotation_ReservedStackAccess,
 953     _jdk_internal_ValueBased,
 954     _annotation_LIMIT
 955   };
 956   const Location _location;
 957   int _annotations_present;
 958   u2 _contended_group;
 959 
 960   AnnotationCollector(Location location)
 961     : _location(location), _annotations_present(0), _contended_group(0)
 962   {
 963     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
 964   }
 965   // If this annotation name has an ID, report it (or _none).
 966   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
 967   // Set the annotation name:
 968   void set_annotation(ID id) {
 969     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 970     _annotations_present |= (int)nth_bit((int)id);
 971   }
 972 
 973   void remove_annotation(ID id) {
 974     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 975     _annotations_present &= (int)~nth_bit((int)id);
 976   }
 977 
 978   // Report if the annotation is present.
 979   bool has_any_annotations() const { return _annotations_present != 0; }
 980   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
 981 
 982   void set_contended_group(u2 group) { _contended_group = group; }
 983   u2 contended_group() const { return _contended_group; }
 984 
 985   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
 986 
 987   void set_stable(bool stable) { set_annotation(_field_Stable); }
 988   bool is_stable() const { return has_annotation(_field_Stable); }
 989 };
 990 
 991 // This class also doubles as a holder for metadata cleanup.
 992 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
 993 private:
 994   ClassLoaderData* _loader_data;
 995   AnnotationArray* _field_annotations;
 996   AnnotationArray* _field_type_annotations;
 997 public:
 998   FieldAnnotationCollector(ClassLoaderData* loader_data) :
 999     AnnotationCollector(_in_field),
1000     _loader_data(loader_data),
1001     _field_annotations(nullptr),
1002     _field_type_annotations(nullptr) {}
1003   ~FieldAnnotationCollector();
1004   void apply_to(FieldInfo* f);
1005   AnnotationArray* field_annotations()      { return _field_annotations; }
1006   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1007 
1008   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
1009   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1010 };
1011 
1012 class MethodAnnotationCollector : public AnnotationCollector{
1013 public:
1014   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1015   void apply_to(const methodHandle& m);
1016 };
1017 
1018 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1019 public:
1020   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1021   void apply_to(InstanceKlass* ik);
1022 };
1023 
1024 
1025 static int skip_annotation_value(const u1*, int, int); // fwd decl
1026 
1027 // Safely increment index by val if does not pass limit
1028 #define SAFE_ADD(index, limit, val) \
1029 if (index >= limit - val) return limit; \
1030 index += val;
1031 
1032 // Skip an annotation.  Return >=limit if there is any problem.
1033 static int skip_annotation(const u1* buffer, int limit, int index) {
1034   assert(buffer != nullptr, "invariant");
1035   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1036   // value := switch (tag:u1) { ... }
1037   SAFE_ADD(index, limit, 4); // skip atype and read nmem
1038   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1039   while (--nmem >= 0 && index < limit) {
1040     SAFE_ADD(index, limit, 2); // skip member
1041     index = skip_annotation_value(buffer, limit, index);
1042   }
1043   return index;
1044 }
1045 
1046 // Skip an annotation value.  Return >=limit if there is any problem.
1047 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1048   assert(buffer != nullptr, "invariant");
1049 
1050   // value := switch (tag:u1) {
1051   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1052   //   case e: e_class:u2 e_name:u2;
1053   //   case s: s_con:u2;
1054   //   case [: do(nval:u2) {value};
1055   //   case @: annotation;
1056   //   case s: s_con:u2;
1057   // }
1058   SAFE_ADD(index, limit, 1); // read tag
1059   const u1 tag = buffer[index - 1];
1060   switch (tag) {
1061     case 'B':
1062     case 'C':
1063     case 'I':
1064     case 'S':
1065     case 'Z':
1066     case 'D':
1067     case 'F':
1068     case 'J':
1069     case 'c':
1070     case 's':
1071       SAFE_ADD(index, limit, 2);  // skip con or s_con
1072       break;
1073     case 'e':
1074       SAFE_ADD(index, limit, 4);  // skip e_class, e_name
1075       break;
1076     case '[':
1077     {
1078       SAFE_ADD(index, limit, 2); // read nval
1079       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1080       while (--nval >= 0 && index < limit) {
1081         index = skip_annotation_value(buffer, limit, index);
1082       }
1083     }
1084     break;
1085     case '@':
1086       index = skip_annotation(buffer, limit, index);
1087       break;
1088     default:
1089       return limit;  //  bad tag byte
1090   }
1091   return index;
1092 }
1093 
1094 // Sift through annotations, looking for those significant to the VM:
1095 static void parse_annotations(const ConstantPool* const cp,
1096                               const u1* buffer, int limit,
1097                               AnnotationCollector* coll,
1098                               ClassLoaderData* loader_data,
1099                               const bool can_access_vm_annotations) {
1100 
1101   assert(cp != nullptr, "invariant");
1102   assert(buffer != nullptr, "invariant");
1103   assert(coll != nullptr, "invariant");
1104   assert(loader_data != nullptr, "invariant");
1105 
1106   // annotations := do(nann:u2) {annotation}
1107   int index = 2; // read nann
1108   if (index >= limit)  return;
1109   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1110   enum {  // initial annotation layout
1111     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1112     count_off = 2,      // u2   such as 1 (one value)
1113     member_off = 4,     // utf8 such as 'value'
1114     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1115     e_tag_val = 'e',
1116     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1117     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1118     e_size = 11,     // end of 'e' annotation
1119     c_tag_val = 'c',    // payload is type
1120     c_con_off = 7,    // utf8 payload, such as 'I'
1121     c_size = 9,       // end of 'c' annotation
1122     s_tag_val = 's',    // payload is String
1123     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1124     s_size = 9,
1125     min_size = 6        // smallest possible size (zero members)
1126   };
1127   // Cannot add min_size to index in case of overflow MAX_INT
1128   while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1129     int index0 = index;
1130     index = skip_annotation(buffer, limit, index);
1131     const u1* const abase = buffer + index0;
1132     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1133     const int count = Bytes::get_Java_u2((address)abase + count_off);
1134     const Symbol* const aname = check_symbol_at(cp, atype);
1135     if (aname == nullptr)  break;  // invalid annotation name
1136     const Symbol* member = nullptr;
1137     if (count >= 1) {
1138       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1139       member = check_symbol_at(cp, member_index);
1140       if (member == nullptr)  break;  // invalid member name
1141     }
1142 
1143     // Here is where parsing particular annotations will take place.
1144     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1145     if (AnnotationCollector::_unknown == id)  continue;
1146     coll->set_annotation(id);
1147 
1148     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1149       // @Contended can optionally specify the contention group.
1150       //
1151       // Contended group defines the equivalence class over the fields:
1152       // the fields within the same contended group are not treated distinct.
1153       // The only exception is default group, which does not incur the
1154       // equivalence. Naturally, contention group for classes is meaningless.
1155       //
1156       // While the contention group is specified as String, annotation
1157       // values are already interned, and we might as well use the constant
1158       // pool index as the group tag.
1159       //
1160       u2 group_index = 0; // default contended group
1161       if (count == 1
1162         && s_size == (index - index0)  // match size
1163         && s_tag_val == *(abase + tag_off)
1164         && member == vmSymbols::value_name()) {
1165         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1166         if (cp->symbol_at(group_index)->utf8_length() == 0) {
1167           group_index = 0; // default contended group
1168         }
1169       }
1170       coll->set_contended_group(group_index);
1171     }
1172   }
1173 }
1174 
1175 
1176 // Parse attributes for a field.
1177 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1178                                              u2 attributes_count,
1179                                              bool is_static, u2 signature_index,
1180                                              u2* const constantvalue_index_addr,
1181                                              bool* const is_synthetic_addr,
1182                                              u2* const generic_signature_index_addr,
1183                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1184                                              TRAPS) {
1185   assert(cfs != nullptr, "invariant");
1186   assert(constantvalue_index_addr != nullptr, "invariant");
1187   assert(is_synthetic_addr != nullptr, "invariant");
1188   assert(generic_signature_index_addr != nullptr, "invariant");
1189   assert(parsed_annotations != nullptr, "invariant");
1190   assert(attributes_count > 0, "attributes_count should be greater than 0");
1191 
1192   u2 constantvalue_index = 0;
1193   u2 generic_signature_index = 0;
1194   bool is_synthetic = false;
1195   const u1* runtime_visible_annotations = nullptr;
1196   int runtime_visible_annotations_length = 0;
1197   const u1* runtime_invisible_annotations = nullptr;
1198   int runtime_invisible_annotations_length = 0;
1199   const u1* runtime_visible_type_annotations = nullptr;
1200   int runtime_visible_type_annotations_length = 0;
1201   const u1* runtime_invisible_type_annotations = nullptr;
1202   int runtime_invisible_type_annotations_length = 0;
1203   bool runtime_invisible_annotations_exists = false;
1204   bool runtime_invisible_type_annotations_exists = false;
1205   const ConstantPool* const cp = _cp;
1206 
1207   while (attributes_count--) {
1208     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1209     const u2 attribute_name_index = cfs->get_u2_fast();
1210     const u4 attribute_length = cfs->get_u4_fast();
1211     check_property(valid_symbol_at(attribute_name_index),
1212                    "Invalid field attribute index %u in class file %s",
1213                    attribute_name_index,
1214                    CHECK);
1215 
1216     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1217     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1218       // ignore if non-static
1219       if (constantvalue_index != 0) {
1220         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1221         return;
1222       }
1223       check_property(
1224         attribute_length == 2,
1225         "Invalid ConstantValue field attribute length %u in class file %s",
1226         attribute_length, CHECK);
1227 
1228       constantvalue_index = cfs->get_u2(CHECK);
1229       if (_need_verify) {
1230         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1231       }
1232     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1233       if (attribute_length != 0) {
1234         classfile_parse_error(
1235           "Invalid Synthetic field attribute length %u in class file %s",
1236           attribute_length, THREAD);
1237         return;
1238       }
1239       is_synthetic = true;
1240     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1241       if (attribute_length != 0) {
1242         classfile_parse_error(
1243           "Invalid Deprecated field attribute length %u in class file %s",
1244           attribute_length, THREAD);
1245         return;
1246       }
1247     } else if (_major_version >= JAVA_1_5_VERSION) {
1248       if (attribute_name == vmSymbols::tag_signature()) {
1249         if (generic_signature_index != 0) {
1250           classfile_parse_error(
1251             "Multiple Signature attributes for field in class file %s", THREAD);
1252           return;
1253         }
1254         if (attribute_length != 2) {
1255           classfile_parse_error(
1256             "Wrong size %u for field's Signature attribute in class file %s",
1257             attribute_length, THREAD);
1258           return;
1259         }
1260         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1261       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1262         if (runtime_visible_annotations != nullptr) {
1263           classfile_parse_error(
1264             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1265           return;
1266         }
1267         runtime_visible_annotations_length = attribute_length;
1268         runtime_visible_annotations = cfs->current();
1269         assert(runtime_visible_annotations != nullptr, "null visible annotations");
1270         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1271         parse_annotations(cp,
1272                           runtime_visible_annotations,
1273                           runtime_visible_annotations_length,
1274                           parsed_annotations,
1275                           _loader_data,
1276                           _can_access_vm_annotations);
1277         cfs->skip_u1_fast(runtime_visible_annotations_length);
1278       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1279         if (runtime_invisible_annotations_exists) {
1280           classfile_parse_error(
1281             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1282           return;
1283         }
1284         runtime_invisible_annotations_exists = true;
1285         if (PreserveAllAnnotations) {
1286           runtime_invisible_annotations_length = attribute_length;
1287           runtime_invisible_annotations = cfs->current();
1288           assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
1289         }
1290         cfs->skip_u1(attribute_length, CHECK);
1291       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1292         if (runtime_visible_type_annotations != nullptr) {
1293           classfile_parse_error(
1294             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1295           return;
1296         }
1297         runtime_visible_type_annotations_length = attribute_length;
1298         runtime_visible_type_annotations = cfs->current();
1299         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1300         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1301       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1302         if (runtime_invisible_type_annotations_exists) {
1303           classfile_parse_error(
1304             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1305           return;
1306         } else {
1307           runtime_invisible_type_annotations_exists = true;
1308         }
1309         if (PreserveAllAnnotations) {
1310           runtime_invisible_type_annotations_length = attribute_length;
1311           runtime_invisible_type_annotations = cfs->current();
1312           assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
1313         }
1314         cfs->skip_u1(attribute_length, CHECK);
1315       } else {
1316         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1317       }
1318     } else {
1319       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1320     }
1321   }
1322 
1323   *constantvalue_index_addr = constantvalue_index;
1324   *is_synthetic_addr = is_synthetic;
1325   *generic_signature_index_addr = generic_signature_index;
1326   AnnotationArray* a = assemble_annotations(runtime_visible_annotations,
1327                                             runtime_visible_annotations_length,
1328                                             runtime_invisible_annotations,
1329                                             runtime_invisible_annotations_length,
1330                                             CHECK);
1331   parsed_annotations->set_field_annotations(a);
1332   a = assemble_annotations(runtime_visible_type_annotations,
1333                            runtime_visible_type_annotations_length,
1334                            runtime_invisible_type_annotations,
1335                            runtime_invisible_type_annotations_length,
1336                            CHECK);
1337   parsed_annotations->set_field_type_annotations(a);
1338   return;
1339 }
1340 
1341 
1342 // Field allocation types. Used for computing field offsets.
1343 
1344 enum FieldAllocationType {
1345   STATIC_OOP,           // Oops
1346   STATIC_BYTE,          // Boolean, Byte, char
1347   STATIC_SHORT,         // shorts
1348   STATIC_WORD,          // ints
1349   STATIC_DOUBLE,        // aligned long or double
1350   NONSTATIC_OOP,
1351   NONSTATIC_BYTE,
1352   NONSTATIC_SHORT,
1353   NONSTATIC_WORD,
1354   NONSTATIC_DOUBLE,
1355   MAX_FIELD_ALLOCATION_TYPE,
1356   BAD_ALLOCATION_TYPE = -1
1357 };
1358 
1359 static FieldAllocationType _basic_type_to_atype[2 * (T_CONFLICT + 1)] = {
1360   BAD_ALLOCATION_TYPE, // 0
1361   BAD_ALLOCATION_TYPE, // 1
1362   BAD_ALLOCATION_TYPE, // 2
1363   BAD_ALLOCATION_TYPE, // 3
1364   NONSTATIC_BYTE ,     // T_BOOLEAN     =  4,
1365   NONSTATIC_SHORT,     // T_CHAR        =  5,
1366   NONSTATIC_WORD,      // T_FLOAT       =  6,
1367   NONSTATIC_DOUBLE,    // T_DOUBLE      =  7,
1368   NONSTATIC_BYTE,      // T_BYTE        =  8,
1369   NONSTATIC_SHORT,     // T_SHORT       =  9,
1370   NONSTATIC_WORD,      // T_INT         = 10,
1371   NONSTATIC_DOUBLE,    // T_LONG        = 11,
1372   NONSTATIC_OOP,       // T_OBJECT      = 12,
1373   NONSTATIC_OOP,       // T_ARRAY       = 13,
1374   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1375   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1376   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1377   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1378   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1379   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1380   BAD_ALLOCATION_TYPE, // 0
1381   BAD_ALLOCATION_TYPE, // 1
1382   BAD_ALLOCATION_TYPE, // 2
1383   BAD_ALLOCATION_TYPE, // 3
1384   STATIC_BYTE ,        // T_BOOLEAN     =  4,
1385   STATIC_SHORT,        // T_CHAR        =  5,
1386   STATIC_WORD,         // T_FLOAT       =  6,
1387   STATIC_DOUBLE,       // T_DOUBLE      =  7,
1388   STATIC_BYTE,         // T_BYTE        =  8,
1389   STATIC_SHORT,        // T_SHORT       =  9,
1390   STATIC_WORD,         // T_INT         = 10,
1391   STATIC_DOUBLE,       // T_LONG        = 11,
1392   STATIC_OOP,          // T_OBJECT      = 12,
1393   STATIC_OOP,          // T_ARRAY       = 13,
1394   BAD_ALLOCATION_TYPE, // T_VOID        = 14,
1395   BAD_ALLOCATION_TYPE, // T_ADDRESS     = 15,
1396   BAD_ALLOCATION_TYPE, // T_NARROWOOP   = 16,
1397   BAD_ALLOCATION_TYPE, // T_METADATA    = 17,
1398   BAD_ALLOCATION_TYPE, // T_NARROWKLASS = 18,
1399   BAD_ALLOCATION_TYPE, // T_CONFLICT    = 19,
1400 };
1401 
1402 static FieldAllocationType basic_type_to_atype(bool is_static, BasicType type) {
1403   assert(type >= T_BOOLEAN && type < T_VOID, "only allowable values");
1404   FieldAllocationType result = _basic_type_to_atype[type + (is_static ? (T_CONFLICT + 1) : 0)];
1405   assert(result != BAD_ALLOCATION_TYPE, "bad type");
1406   return result;
1407 }
1408 
1409 class ClassFileParser::FieldAllocationCount : public ResourceObj {
1410  public:
1411   u2 count[MAX_FIELD_ALLOCATION_TYPE];
1412 
1413   FieldAllocationCount() {
1414     for (int i = 0; i < MAX_FIELD_ALLOCATION_TYPE; i++) {
1415       count[i] = 0;
1416     }
1417   }
1418 
1419   void update(bool is_static, BasicType type) {
1420     FieldAllocationType atype = basic_type_to_atype(is_static, type);
1421     if (atype != BAD_ALLOCATION_TYPE) {
1422       // Make sure there is no overflow with injected fields.
1423       assert(count[atype] < 0xFFFF, "More than 65535 fields");
1424       count[atype]++;
1425     }
1426   }
1427 };
1428 
1429 // Side-effects: populates the _fields, _fields_annotations,
1430 // _fields_type_annotations fields
1431 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1432                                    bool is_interface,
1433                                    FieldAllocationCount* const fac,
1434                                    ConstantPool* cp,
1435                                    const int cp_size,
1436                                    u2* const java_fields_count_ptr,
1437                                    TRAPS) {
1438 
1439   assert(cfs != nullptr, "invariant");
1440   assert(fac != nullptr, "invariant");
1441   assert(cp != nullptr, "invariant");
1442   assert(java_fields_count_ptr != nullptr, "invariant");
1443 
1444   assert(nullptr == _fields_annotations, "invariant");
1445   assert(nullptr == _fields_type_annotations, "invariant");
1446 
1447   cfs->guarantee_more(2, CHECK);  // length
1448   const u2 length = cfs->get_u2_fast();
1449   *java_fields_count_ptr = length;
1450 
1451   int num_injected = 0;
1452   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1453                                                                   &num_injected);
1454   const int total_fields = length + num_injected;
1455 
1456   // Allocate a temporary resource array to collect field data.
1457   // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1458   _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1459 
1460   ResourceMark rm(THREAD);
1461   for (int n = 0; n < length; n++) {
1462     // access_flags, name_index, descriptor_index, attributes_count
1463     cfs->guarantee_more(8, CHECK);
1464 
1465     AccessFlags access_flags;
1466     const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS;
1467     verify_legal_field_modifiers(flags, is_interface, CHECK);
1468     access_flags.set_flags(flags);
1469     FieldInfo::FieldFlags fieldFlags(0);
1470 
1471     const u2 name_index = cfs->get_u2_fast();
1472     check_property(valid_symbol_at(name_index),
1473       "Invalid constant pool index %u for field name in class file %s",
1474       name_index, CHECK);
1475     const Symbol* const name = cp->symbol_at(name_index);
1476     verify_legal_field_name(name, CHECK);
1477 
1478     const u2 signature_index = cfs->get_u2_fast();
1479     check_property(valid_symbol_at(signature_index),
1480       "Invalid constant pool index %u for field signature in class file %s",
1481       signature_index, CHECK);
1482     const Symbol* const sig = cp->symbol_at(signature_index);
1483     verify_legal_field_signature(name, sig, CHECK);
1484 
1485     u2 constantvalue_index = 0;
1486     bool is_synthetic = false;
1487     u2 generic_signature_index = 0;
1488     const bool is_static = access_flags.is_static();
1489     FieldAnnotationCollector parsed_annotations(_loader_data);
1490 
1491     const u2 attributes_count = cfs->get_u2_fast();
1492     if (attributes_count > 0) {
1493       parse_field_attributes(cfs,
1494                              attributes_count,
1495                              is_static,
1496                              signature_index,
1497                              &constantvalue_index,
1498                              &is_synthetic,
1499                              &generic_signature_index,
1500                              &parsed_annotations,
1501                              CHECK);
1502 
1503       if (parsed_annotations.field_annotations() != nullptr) {
1504         if (_fields_annotations == nullptr) {
1505           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1506                                              _loader_data, length, nullptr,
1507                                              CHECK);
1508         }
1509         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1510         parsed_annotations.set_field_annotations(nullptr);
1511       }
1512       if (parsed_annotations.field_type_annotations() != nullptr) {
1513         if (_fields_type_annotations == nullptr) {
1514           _fields_type_annotations =
1515             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1516                                                          length,
1517                                                          nullptr,
1518                                                          CHECK);
1519         }
1520         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1521         parsed_annotations.set_field_type_annotations(nullptr);
1522       }
1523 
1524       if (is_synthetic) {
1525         access_flags.set_is_synthetic();
1526       }
1527       if (generic_signature_index != 0) {
1528         fieldFlags.update_generic(true);
1529       }
1530     }
1531 
1532     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1533 
1534     // Update FieldAllocationCount for this kind of field
1535     fac->update(is_static, type);
1536 
1537     FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1538     fi.set_index(n);
1539     if (fieldFlags.is_generic()) {
1540       fi.set_generic_signature_index(generic_signature_index);
1541     }
1542     parsed_annotations.apply_to(&fi);
1543     if (fi.field_flags().is_contended()) {
1544       _has_contended_fields = true;
1545     }
1546     _temp_field_info->append(fi);
1547   }
1548   assert(_temp_field_info->length() == length, "Must be");
1549 
1550   int index = length;
1551   if (num_injected != 0) {
1552     for (int n = 0; n < num_injected; n++) {
1553       // Check for duplicates
1554       if (injected[n].may_be_java) {
1555         const Symbol* const name      = injected[n].name();
1556         const Symbol* const signature = injected[n].signature();
1557         bool duplicate = false;
1558         for (int i = 0; i < length; i++) {
1559           const FieldInfo* const f = _temp_field_info->adr_at(i);
1560           if (name      == cp->symbol_at(f->name_index()) &&
1561               signature == cp->symbol_at(f->signature_index())) {
1562             // Symbol is desclared in Java so skip this one
1563             duplicate = true;
1564             break;
1565           }
1566         }
1567         if (duplicate) {
1568           // These will be removed from the field array at the end
1569           continue;
1570         }
1571       }
1572 
1573       // Injected field
1574       FieldInfo::FieldFlags fflags(0);
1575       fflags.update_injected(true);
1576       AccessFlags aflags;
1577       FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1578       fi.set_index(index);
1579       _temp_field_info->append(fi);
1580 
1581       // Update FieldAllocationCount for this kind of field
1582       const BasicType type = Signature::basic_type(injected[n].signature());
1583       fac->update(false, type);
1584       index++;
1585     }
1586   }
1587 
1588   assert(_temp_field_info->length() == index, "Must be");
1589 
1590   if (_need_verify && length > 1) {
1591     // Check duplicated fields
1592     ResourceMark rm(THREAD);
1593     // Set containing name-signature pairs
1594     NameSigHashtable* names_and_sigs = new NameSigHashtable();
1595     for (int i = 0; i < _temp_field_info->length(); i++) {
1596       NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1597                                _temp_field_info->adr_at(i)->signature(_cp));
1598       // If no duplicates, add name/signature in hashtable names_and_sigs.
1599       if(!names_and_sigs->put(name_and_sig, 0)) {
1600         classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1601                                name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1602         return;
1603       }
1604     }
1605   }
1606 }
1607 
1608 
1609 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1610                                                                          u4 code_length,
1611                                                                          u4 exception_table_length,
1612                                                                          TRAPS) {
1613   assert(cfs != nullptr, "invariant");
1614 
1615   const unsafe_u2* const exception_table_start = cfs->current();
1616   assert(exception_table_start != nullptr, "null exception table");
1617 
1618   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1619                                                                // end_pc,
1620                                                                // handler_pc,
1621                                                                // catch_type_index
1622 
1623   // Will check legal target after parsing code array in verifier.
1624   if (_need_verify) {
1625     for (unsigned int i = 0; i < exception_table_length; i++) {
1626       const u2 start_pc = cfs->get_u2_fast();
1627       const u2 end_pc = cfs->get_u2_fast();
1628       const u2 handler_pc = cfs->get_u2_fast();
1629       const u2 catch_type_index = cfs->get_u2_fast();
1630       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1631                          "Illegal exception table range in class file %s",
1632                          CHECK_NULL);
1633       guarantee_property(handler_pc < code_length,
1634                          "Illegal exception table handler in class file %s",
1635                          CHECK_NULL);
1636       if (catch_type_index != 0) {
1637         guarantee_property(valid_klass_reference_at(catch_type_index),
1638                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1639       }
1640     }
1641   } else {
1642     cfs->skip_u2_fast(exception_table_length * 4);
1643   }
1644   return exception_table_start;
1645 }
1646 
1647 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1648                                              u4 code_length,
1649                                              CompressedLineNumberWriteStream**const write_stream,
1650                                              TRAPS) {
1651 
1652   const ClassFileStream* const cfs = _stream;
1653   unsigned int num_entries = cfs->get_u2(CHECK);
1654 
1655   // Each entry is a u2 start_pc, and a u2 line_number
1656   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1657 
1658   // Verify line number attribute and table length
1659   check_property(
1660     code_attribute_length == sizeof(u2) + length_in_bytes,
1661     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1662 
1663   cfs->guarantee_more(length_in_bytes, CHECK);
1664 
1665   if ((*write_stream) == nullptr) {
1666     if (length_in_bytes > fixed_buffer_size) {
1667       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1668     } else {
1669       (*write_stream) = new CompressedLineNumberWriteStream(
1670         _linenumbertable_buffer, fixed_buffer_size);
1671     }
1672   }
1673 
1674   while (num_entries-- > 0) {
1675     const u2 bci  = cfs->get_u2_fast(); // start_pc
1676     const u2 line = cfs->get_u2_fast(); // line_number
1677     guarantee_property(bci < code_length,
1678         "Invalid pc in LineNumberTable in class file %s", CHECK);
1679     (*write_stream)->write_pair(bci, line);
1680   }
1681 }
1682 
1683 
1684 class LVT_Hash : public AllStatic {
1685  public:
1686 
1687   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1688   /*
1689    * 3-tuple start_bci/length/slot has to be unique key,
1690    * so the following comparison seems to be redundant:
1691    *       && elem->name_cp_index == entry->_elem->name_cp_index
1692    */
1693     return (e0.start_bci     == e1.start_bci &&
1694             e0.length        == e1.length &&
1695             e0.name_cp_index == e1.name_cp_index &&
1696             e0.slot          == e1.slot);
1697   }
1698 
1699   static unsigned int hash(LocalVariableTableElement const& e0) {
1700     unsigned int raw_hash = e0.start_bci;
1701 
1702     raw_hash = e0.length        + raw_hash * 37;
1703     raw_hash = e0.name_cp_index + raw_hash * 37;
1704     raw_hash = e0.slot          + raw_hash * 37;
1705 
1706     return raw_hash;
1707   }
1708 };
1709 
1710 
1711 // Class file LocalVariableTable elements.
1712 class Classfile_LVT_Element {
1713  public:
1714   u2 start_bci;
1715   u2 length;
1716   u2 name_cp_index;
1717   u2 descriptor_cp_index;
1718   u2 slot;
1719 };
1720 
1721 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1722                              LocalVariableTableElement* const lvt) {
1723   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1724   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1725   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1726   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1727   lvt->signature_cp_index  = 0;
1728   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1729 }
1730 
1731 // Function is used to parse both attributes:
1732 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1733 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1734                                                                              u4 code_length,
1735                                                                              u2 max_locals,
1736                                                                              u4 code_attribute_length,
1737                                                                              u2* const localvariable_table_length,
1738                                                                              bool isLVTT,
1739                                                                              TRAPS) {
1740   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1741   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1742   const unsigned int size = checked_cast<unsigned>(
1743     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1744 
1745   const ConstantPool* const cp = _cp;
1746 
1747   // Verify local variable table attribute has right length
1748   if (_need_verify) {
1749     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1750                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1751   }
1752 
1753   const unsafe_u2* const localvariable_table_start = cfs->current();
1754   assert(localvariable_table_start != nullptr, "null local variable table");
1755   if (!_need_verify) {
1756     cfs->skip_u2_fast(size);
1757   } else {
1758     cfs->guarantee_more(size * 2, CHECK_NULL);
1759     for(int i = 0; i < (*localvariable_table_length); i++) {
1760       const u2 start_pc = cfs->get_u2_fast();
1761       const u2 length = cfs->get_u2_fast();
1762       const u2 name_index = cfs->get_u2_fast();
1763       const u2 descriptor_index = cfs->get_u2_fast();
1764       const u2 index = cfs->get_u2_fast();
1765       // Assign to a u4 to avoid overflow
1766       const u4 end_pc = (u4)start_pc + (u4)length;
1767 
1768       if (start_pc >= code_length) {
1769         classfile_parse_error(
1770           "Invalid start_pc %u in %s in class file %s",
1771           start_pc, tbl_name, THREAD);
1772         return nullptr;
1773       }
1774       if (end_pc > code_length) {
1775         classfile_parse_error(
1776           "Invalid length %u in %s in class file %s",
1777           length, tbl_name, THREAD);
1778         return nullptr;
1779       }
1780       const int cp_size = cp->length();
1781       guarantee_property(valid_symbol_at(name_index),
1782         "Name index %u in %s has bad constant type in class file %s",
1783         name_index, tbl_name, CHECK_NULL);
1784       guarantee_property(valid_symbol_at(descriptor_index),
1785         "Signature index %u in %s has bad constant type in class file %s",
1786         descriptor_index, tbl_name, CHECK_NULL);
1787 
1788       const Symbol* const name = cp->symbol_at(name_index);
1789       const Symbol* const sig = cp->symbol_at(descriptor_index);
1790       verify_legal_field_name(name, CHECK_NULL);
1791       u2 extra_slot = 0;
1792       if (!isLVTT) {
1793         verify_legal_field_signature(name, sig, CHECK_NULL);
1794 
1795         // 4894874: check special cases for double and long local variables
1796         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1797             sig == vmSymbols::type_signature(T_LONG)) {
1798           extra_slot = 1;
1799         }
1800       }
1801       guarantee_property((index + extra_slot) < max_locals,
1802                           "Invalid index %u in %s in class file %s",
1803                           index, tbl_name, CHECK_NULL);
1804     }
1805   }
1806   return localvariable_table_start;
1807 }
1808 
1809 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1810                                       u4 code_attribute_length,
1811                                       TRAPS) {
1812   assert(cfs != nullptr, "invariant");
1813 
1814   if (0 == code_attribute_length) {
1815     return nullptr;
1816   }
1817 
1818   const u1* const stackmap_table_start = cfs->current();
1819   assert(stackmap_table_start != nullptr, "null stackmap table");
1820 
1821   // check code_attribute_length
1822   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1823 
1824   return stackmap_table_start;
1825 }
1826 
1827 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1828                                                                             u2* const checked_exceptions_length,
1829                                                                             u4 method_attribute_length,
1830                                                                             TRAPS) {
1831   assert(cfs != nullptr, "invariant");
1832   assert(checked_exceptions_length != nullptr, "invariant");
1833 
1834   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1835   *checked_exceptions_length = cfs->get_u2_fast();
1836   const unsigned int size =
1837     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1838   const unsafe_u2* const checked_exceptions_start = cfs->current();
1839   assert(checked_exceptions_start != nullptr, "null checked exceptions");
1840   if (!_need_verify) {
1841     cfs->skip_u2_fast(size);
1842   } else {
1843     // Verify each value in the checked exception table
1844     u2 checked_exception;
1845     const u2 len = *checked_exceptions_length;
1846     cfs->guarantee_more(2 * len, CHECK_NULL);
1847     for (int i = 0; i < len; i++) {
1848       checked_exception = cfs->get_u2_fast();
1849       check_property(
1850         valid_klass_reference_at(checked_exception),
1851         "Exception name has bad type at constant pool %u in class file %s",
1852         checked_exception, CHECK_NULL);
1853     }
1854   }
1855   // check exceptions attribute length
1856   if (_need_verify) {
1857     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1858                                                    sizeof(u2) * size),
1859                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1860   }
1861   return checked_exceptions_start;
1862 }
1863 
1864 void ClassFileParser::throwIllegalSignature(const char* type,
1865                                             const Symbol* name,
1866                                             const Symbol* sig,
1867                                             TRAPS) const {
1868   assert(name != nullptr, "invariant");
1869   assert(sig != nullptr, "invariant");
1870 
1871   ResourceMark rm(THREAD);
1872   Exceptions::fthrow(THREAD_AND_LOCATION,
1873       vmSymbols::java_lang_ClassFormatError(),
1874       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1875       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1876 }
1877 
1878 AnnotationCollector::ID
1879 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1880                                       const Symbol* name,
1881                                       const bool can_access_vm_annotations) {
1882   const vmSymbolID sid = vmSymbols::find_sid(name);
1883   // Privileged code can use all annotations.  Other code silently drops some.
1884   const bool privileged = loader_data->is_boot_class_loader_data() ||
1885                           loader_data->is_platform_class_loader_data() ||
1886                           can_access_vm_annotations;
1887   switch (sid) {
1888     case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1889       if (_location != _in_method)  break;  // only allow for methods
1890       if (!privileged)              break;  // only allow in privileged code
1891       return _method_CallerSensitive;
1892     }
1893     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1894       if (_location != _in_method)  break;  // only allow for methods
1895       if (!privileged)              break;  // only allow in privileged code
1896       return _method_ForceInline;
1897     }
1898     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1899       if (_location != _in_method)  break;  // only allow for methods
1900       if (!privileged)              break;  // only allow in privileged code
1901       return _method_DontInline;
1902     }
1903     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1904       if (_location != _in_method)  break;  // only allow for methods
1905       if (!privileged)              break;  // only allow in privileged code
1906       return _method_ChangesCurrentThread;
1907     }
1908     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1909       if (_location != _in_method)  break;  // only allow for methods
1910       if (!privileged)              break;  // only allow in privileged code
1911       return _method_JvmtiMountTransition;
1912     }
1913     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1914       if (_location != _in_method)  break;  // only allow for methods
1915       if (!privileged)              break;  // only allow in privileged code
1916       return _method_InjectedProfile;
1917     }
1918     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1919       if (_location != _in_method)  break;  // only allow for methods
1920       if (!privileged)              break;  // only allow in privileged code
1921       return _method_LambdaForm_Compiled;
1922     }
1923     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1924       if (_location != _in_method)  break;  // only allow for methods
1925       if (!privileged)              break;  // only allow in privileged code
1926       return _method_Hidden;
1927     }
1928     case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1929       if (_location != _in_method)  break;  // only allow for methods
1930       if (!privileged)              break;  // only allow in privileged code
1931       return _method_Scoped;
1932     }
1933     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1934       if (_location != _in_method)  break;  // only allow for methods
1935       if (!privileged)              break;  // only allow in privileged code
1936       return _method_IntrinsicCandidate;
1937     }
1938     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1939       if (_location != _in_field)   break;  // only allow for fields
1940       if (!privileged)              break;  // only allow in privileged code
1941       return _field_Stable;
1942     }
1943     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1944       if (_location != _in_field && _location != _in_class) {
1945         break;  // only allow for fields and classes
1946       }
1947       if (!EnableContended || (RestrictContended && !privileged)) {
1948         break;  // honor privileges
1949       }
1950       return _jdk_internal_vm_annotation_Contended;
1951     }
1952     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1953       if (_location != _in_method)  break;  // only allow for methods
1954       if (RestrictReservedStack && !privileged) break; // honor privileges
1955       return _jdk_internal_vm_annotation_ReservedStackAccess;
1956     }
1957     case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1958       if (_location != _in_class)   break;  // only allow for classes
1959       if (!privileged)              break;  // only allow in privileged code
1960       return _jdk_internal_ValueBased;
1961     }
1962     default: {
1963       break;
1964     }
1965   }
1966   return AnnotationCollector::_unknown;
1967 }
1968 
1969 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1970   if (is_contended())
1971     // Setting the contended group also sets the contended bit in field flags
1972     f->set_contended_group(contended_group());
1973   if (is_stable())
1974     (f->field_flags_addr())->update_stable(true);
1975 }
1976 
1977 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1978   // If there's an error deallocate metadata for field annotations
1979   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1980   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1981 }
1982 
1983 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1984   if (has_annotation(_method_CallerSensitive))
1985     m->set_caller_sensitive();
1986   if (has_annotation(_method_ForceInline))
1987     m->set_force_inline();
1988   if (has_annotation(_method_DontInline))
1989     m->set_dont_inline();
1990   if (has_annotation(_method_ChangesCurrentThread))
1991     m->set_changes_current_thread();
1992   if (has_annotation(_method_JvmtiMountTransition))
1993     m->set_jvmti_mount_transition();
1994   if (has_annotation(_method_InjectedProfile))
1995     m->set_has_injected_profile();
1996   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
1997     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
1998   if (has_annotation(_method_Hidden))
1999     m->set_is_hidden();
2000   if (has_annotation(_method_Scoped))
2001     m->set_scoped();
2002   if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2003     m->set_intrinsic_candidate();
2004   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2005     m->set_has_reserved_stack_access();
2006 }
2007 
2008 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2009   assert(ik != nullptr, "invariant");
2010   if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2011     ik->set_is_contended(is_contended());
2012   }
2013   if (has_annotation(_jdk_internal_ValueBased)) {
2014     ik->set_has_value_based_class_annotation();
2015     if (DiagnoseSyncOnValueBasedClasses) {
2016       ik->set_is_value_based();
2017     }
2018   }
2019 }
2020 
2021 #define MAX_ARGS_SIZE 255
2022 #define MAX_CODE_SIZE 65535
2023 #define INITIAL_MAX_LVT_NUMBER 256
2024 
2025 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2026  *
2027  * Rules for LVT's and LVTT's are:
2028  *   - There can be any number of LVT's and LVTT's.
2029  *   - If there are n LVT's, it is the same as if there was just
2030  *     one LVT containing all the entries from the n LVT's.
2031  *   - There may be no more than one LVT entry per local variable.
2032  *     Two LVT entries are 'equal' if these fields are the same:
2033  *        start_pc, length, name, slot
2034  *   - There may be no more than one LVTT entry per each LVT entry.
2035  *     Each LVTT entry has to match some LVT entry.
2036  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2037  */
2038 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2039                                                int lvt_cnt,
2040                                                u2* const localvariable_table_length,
2041                                                const unsafe_u2** const localvariable_table_start,
2042                                                int lvtt_cnt,
2043                                                u2* const localvariable_type_table_length,
2044                                                const unsafe_u2** const localvariable_type_table_start,
2045                                                TRAPS) {
2046 
2047   ResourceMark rm(THREAD);
2048 
2049   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2050                             256, AnyObj::RESOURCE_AREA, mtInternal,
2051                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2052 
2053   LVT_HashTable* const table = new LVT_HashTable();
2054 
2055   // To fill LocalVariableTable in
2056   const Classfile_LVT_Element* cf_lvt;
2057   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2058 
2059   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2060     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2061     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2062       copy_lvt_element(&cf_lvt[idx], lvt);
2063       // If no duplicates, add LVT elem in hashtable.
2064       if (table->put(*lvt, lvt) == false
2065           && _need_verify
2066           && _major_version >= JAVA_1_5_VERSION) {
2067         classfile_parse_error("Duplicated LocalVariableTable attribute "
2068                               "entry for '%s' in class file %s",
2069                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2070                                THREAD);
2071         return;
2072       }
2073     }
2074   }
2075 
2076   // To merge LocalVariableTable and LocalVariableTypeTable
2077   const Classfile_LVT_Element* cf_lvtt;
2078   LocalVariableTableElement lvtt_elem;
2079 
2080   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2081     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2082     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2083       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2084       LocalVariableTableElement** entry = table->get(lvtt_elem);
2085       if (entry == nullptr) {
2086         if (_need_verify) {
2087           classfile_parse_error("LVTT entry for '%s' in class file %s "
2088                                 "does not match any LVT entry",
2089                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2090                                  THREAD);
2091           return;
2092         }
2093       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2094         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2095                               "entry for '%s' in class file %s",
2096                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2097                                THREAD);
2098         return;
2099       } else {
2100         // to add generic signatures into LocalVariableTable
2101         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2102       }
2103     }
2104   }
2105 }
2106 
2107 
2108 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2109                                        const u1* runtime_visible_annotations,
2110                                        int runtime_visible_annotations_length,
2111                                        const u1* runtime_invisible_annotations,
2112                                        int runtime_invisible_annotations_length,
2113                                        const u1* runtime_visible_parameter_annotations,
2114                                        int runtime_visible_parameter_annotations_length,
2115                                        const u1* runtime_invisible_parameter_annotations,
2116                                        int runtime_invisible_parameter_annotations_length,
2117                                        const u1* runtime_visible_type_annotations,
2118                                        int runtime_visible_type_annotations_length,
2119                                        const u1* runtime_invisible_type_annotations,
2120                                        int runtime_invisible_type_annotations_length,
2121                                        const u1* annotation_default,
2122                                        int annotation_default_length,
2123                                        TRAPS) {
2124 
2125   AnnotationArray* a;
2126 
2127   if (runtime_visible_annotations_length +
2128       runtime_invisible_annotations_length > 0) {
2129      a = assemble_annotations(runtime_visible_annotations,
2130                               runtime_visible_annotations_length,
2131                               runtime_invisible_annotations,
2132                               runtime_invisible_annotations_length,
2133                               CHECK);
2134      cm->set_method_annotations(a);
2135   }
2136 
2137   if (runtime_visible_parameter_annotations_length +
2138       runtime_invisible_parameter_annotations_length > 0) {
2139     a = assemble_annotations(runtime_visible_parameter_annotations,
2140                              runtime_visible_parameter_annotations_length,
2141                              runtime_invisible_parameter_annotations,
2142                              runtime_invisible_parameter_annotations_length,
2143                              CHECK);
2144     cm->set_parameter_annotations(a);
2145   }
2146 
2147   if (annotation_default_length > 0) {
2148     a = assemble_annotations(annotation_default,
2149                              annotation_default_length,
2150                              nullptr,
2151                              0,
2152                              CHECK);
2153     cm->set_default_annotations(a);
2154   }
2155 
2156   if (runtime_visible_type_annotations_length +
2157       runtime_invisible_type_annotations_length > 0) {
2158     a = assemble_annotations(runtime_visible_type_annotations,
2159                              runtime_visible_type_annotations_length,
2160                              runtime_invisible_type_annotations,
2161                              runtime_invisible_type_annotations_length,
2162                              CHECK);
2163     cm->set_type_annotations(a);
2164   }
2165 }
2166 
2167 
2168 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2169 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2170 // Method* to save footprint, so we only know the size of the resulting Method* when the
2171 // entire method attribute is parsed.
2172 //
2173 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2174 
2175 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2176                                       bool is_interface,
2177                                       const ConstantPool* cp,
2178                                       bool* const has_localvariable_table,
2179                                       TRAPS) {
2180   assert(cfs != nullptr, "invariant");
2181   assert(cp != nullptr, "invariant");
2182   assert(has_localvariable_table != nullptr, "invariant");
2183 
2184   ResourceMark rm(THREAD);
2185   // Parse fixed parts:
2186   // access_flags, name_index, descriptor_index, attributes_count
2187   cfs->guarantee_more(8, CHECK_NULL);
2188 
2189   int flags = cfs->get_u2_fast();
2190   const u2 name_index = cfs->get_u2_fast();
2191   const int cp_size = cp->length();
2192   check_property(
2193     valid_symbol_at(name_index),
2194     "Illegal constant pool index %u for method name in class file %s",
2195     name_index, CHECK_NULL);
2196   const Symbol* const name = cp->symbol_at(name_index);
2197   verify_legal_method_name(name, CHECK_NULL);
2198 
2199   const u2 signature_index = cfs->get_u2_fast();
2200   guarantee_property(
2201     valid_symbol_at(signature_index),
2202     "Illegal constant pool index %u for method signature in class file %s",
2203     signature_index, CHECK_NULL);
2204   const Symbol* const signature = cp->symbol_at(signature_index);
2205 
2206   if (name == vmSymbols::class_initializer_name()) {
2207     // We ignore the other access flags for a valid class initializer.
2208     // (JVM Spec 2nd ed., chapter 4.6)
2209     if (_major_version < 51) { // backward compatibility
2210       flags = JVM_ACC_STATIC;
2211     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2212       flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2213     } else {
2214       classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2215       return nullptr;
2216     }
2217   } else {
2218     verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL);
2219   }
2220 
2221   if (name == vmSymbols::object_initializer_name() && is_interface) {
2222     classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2223     return nullptr;
2224   }
2225 
2226   int args_size = -1;  // only used when _need_verify is true
2227   if (_need_verify) {
2228     verify_legal_name_with_signature(name, signature, CHECK_NULL);
2229     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2230                  verify_legal_method_signature(name, signature, CHECK_NULL);
2231     if (args_size > MAX_ARGS_SIZE) {
2232       classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2233       return nullptr;
2234     }
2235   }
2236 
2237   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2238 
2239   // Default values for code and exceptions attribute elements
2240   u2 max_stack = 0;
2241   u2 max_locals = 0;
2242   u4 code_length = 0;
2243   const u1* code_start = 0;
2244   u2 exception_table_length = 0;
2245   const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2246   Array<int>* exception_handlers = Universe::the_empty_int_array();
2247   u2 checked_exceptions_length = 0;
2248   const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2249   CompressedLineNumberWriteStream* linenumber_table = nullptr;
2250   int linenumber_table_length = 0;
2251   int total_lvt_length = 0;
2252   u2 lvt_cnt = 0;
2253   u2 lvtt_cnt = 0;
2254   bool lvt_allocated = false;
2255   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2256   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2257   u2* localvariable_table_length = nullptr;
2258   const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2259   u2* localvariable_type_table_length = nullptr;
2260   const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2261   int method_parameters_length = -1;
2262   const u1* method_parameters_data = nullptr;
2263   bool method_parameters_seen = false;
2264   bool parsed_code_attribute = false;
2265   bool parsed_checked_exceptions_attribute = false;
2266   bool parsed_stackmap_attribute = false;
2267   // stackmap attribute - JDK1.5
2268   const u1* stackmap_data = nullptr;
2269   int stackmap_data_length = 0;
2270   u2 generic_signature_index = 0;
2271   MethodAnnotationCollector parsed_annotations;
2272   const u1* runtime_visible_annotations = nullptr;
2273   int runtime_visible_annotations_length = 0;
2274   const u1* runtime_invisible_annotations = nullptr;
2275   int runtime_invisible_annotations_length = 0;
2276   const u1* runtime_visible_parameter_annotations = nullptr;
2277   int runtime_visible_parameter_annotations_length = 0;
2278   const u1* runtime_invisible_parameter_annotations = nullptr;
2279   int runtime_invisible_parameter_annotations_length = 0;
2280   const u1* runtime_visible_type_annotations = nullptr;
2281   int runtime_visible_type_annotations_length = 0;
2282   const u1* runtime_invisible_type_annotations = nullptr;
2283   int runtime_invisible_type_annotations_length = 0;
2284   bool runtime_invisible_annotations_exists = false;
2285   bool runtime_invisible_type_annotations_exists = false;
2286   bool runtime_invisible_parameter_annotations_exists = false;
2287   const u1* annotation_default = nullptr;
2288   int annotation_default_length = 0;
2289 
2290   // Parse code and exceptions attribute
2291   u2 method_attributes_count = cfs->get_u2_fast();
2292   while (method_attributes_count--) {
2293     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2294     const u2 method_attribute_name_index = cfs->get_u2_fast();
2295     const u4 method_attribute_length = cfs->get_u4_fast();
2296     check_property(
2297       valid_symbol_at(method_attribute_name_index),
2298       "Invalid method attribute name index %u in class file %s",
2299       method_attribute_name_index, CHECK_NULL);
2300 
2301     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2302     if (method_attribute_name == vmSymbols::tag_code()) {
2303       // Parse Code attribute
2304       if (_need_verify) {
2305         guarantee_property(
2306             !access_flags.is_native() && !access_flags.is_abstract(),
2307                         "Code attribute in native or abstract methods in class file %s",
2308                          CHECK_NULL);
2309       }
2310       if (parsed_code_attribute) {
2311         classfile_parse_error("Multiple Code attributes in class file %s",
2312                               THREAD);
2313         return nullptr;
2314       }
2315       parsed_code_attribute = true;
2316 
2317       // Stack size, locals size, and code size
2318       cfs->guarantee_more(8, CHECK_NULL);
2319       max_stack = cfs->get_u2_fast();
2320       max_locals = cfs->get_u2_fast();
2321       code_length = cfs->get_u4_fast();
2322       if (_need_verify) {
2323         guarantee_property(args_size <= max_locals,
2324                            "Arguments can't fit into locals in class file %s",
2325                            CHECK_NULL);
2326         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2327                            "Invalid method Code length %u in class file %s",
2328                            code_length, CHECK_NULL);
2329       }
2330       // Code pointer
2331       code_start = cfs->current();
2332       assert(code_start != nullptr, "null code start");
2333       cfs->guarantee_more(code_length, CHECK_NULL);
2334       cfs->skip_u1_fast(code_length);
2335 
2336       // Exception handler table
2337       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2338       exception_table_length = cfs->get_u2_fast();
2339       if (exception_table_length > 0) {
2340         exception_table_start = parse_exception_table(cfs,
2341                                                       code_length,
2342                                                       exception_table_length,
2343                                                       CHECK_NULL);
2344       }
2345 
2346       // Parse additional attributes in code attribute
2347       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2348       u2 code_attributes_count = cfs->get_u2_fast();
2349 
2350       unsigned int calculated_attribute_length = 0;
2351 
2352       calculated_attribute_length =
2353           sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2354       calculated_attribute_length += checked_cast<unsigned int>(
2355         code_length +
2356         sizeof(exception_table_length) +
2357         sizeof(code_attributes_count) +
2358         exception_table_length *
2359             ( sizeof(u2) +   // start_pc
2360               sizeof(u2) +   // end_pc
2361               sizeof(u2) +   // handler_pc
2362               sizeof(u2) )); // catch_type_index
2363 
2364       while (code_attributes_count--) {
2365         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2366         const u2 code_attribute_name_index = cfs->get_u2_fast();
2367         const u4 code_attribute_length = cfs->get_u4_fast();
2368         calculated_attribute_length += code_attribute_length +
2369                                        (unsigned)sizeof(code_attribute_name_index) +
2370                                        (unsigned)sizeof(code_attribute_length);
2371         check_property(valid_symbol_at(code_attribute_name_index),
2372                        "Invalid code attribute name index %u in class file %s",
2373                        code_attribute_name_index,
2374                        CHECK_NULL);
2375         if (LoadLineNumberTables &&
2376             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2377           // Parse and compress line number table
2378           parse_linenumber_table(code_attribute_length,
2379                                  code_length,
2380                                  &linenumber_table,
2381                                  CHECK_NULL);
2382 
2383         } else if (LoadLocalVariableTables &&
2384                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2385           // Parse local variable table
2386           if (!lvt_allocated) {
2387             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2388               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2389             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2390               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2391             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2392               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2393             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2394               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2395             lvt_allocated = true;
2396           }
2397           if (lvt_cnt == max_lvt_cnt) {
2398             max_lvt_cnt <<= 1;
2399             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2400             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2401           }
2402           localvariable_table_start[lvt_cnt] =
2403             parse_localvariable_table(cfs,
2404                                       code_length,
2405                                       max_locals,
2406                                       code_attribute_length,
2407                                       &localvariable_table_length[lvt_cnt],
2408                                       false,    // is not LVTT
2409                                       CHECK_NULL);
2410           total_lvt_length += localvariable_table_length[lvt_cnt];
2411           lvt_cnt++;
2412         } else if (LoadLocalVariableTypeTables &&
2413                    _major_version >= JAVA_1_5_VERSION &&
2414                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2415           if (!lvt_allocated) {
2416             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2417               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2418             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2419               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2420             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2421               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2422             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2423               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2424             lvt_allocated = true;
2425           }
2426           // Parse local variable type table
2427           if (lvtt_cnt == max_lvtt_cnt) {
2428             max_lvtt_cnt <<= 1;
2429             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2430             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2431           }
2432           localvariable_type_table_start[lvtt_cnt] =
2433             parse_localvariable_table(cfs,
2434                                       code_length,
2435                                       max_locals,
2436                                       code_attribute_length,
2437                                       &localvariable_type_table_length[lvtt_cnt],
2438                                       true,     // is LVTT
2439                                       CHECK_NULL);
2440           lvtt_cnt++;
2441         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2442                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2443           // Stack map is only needed by the new verifier in JDK1.5.
2444           if (parsed_stackmap_attribute) {
2445             classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2446             return nullptr;
2447           }
2448           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2449           stackmap_data_length = code_attribute_length;
2450           parsed_stackmap_attribute = true;
2451         } else {
2452           // Skip unknown attributes
2453           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2454         }
2455       }
2456       // check method attribute length
2457       if (_need_verify) {
2458         guarantee_property(method_attribute_length == calculated_attribute_length,
2459                            "Code segment has wrong length in class file %s",
2460                            CHECK_NULL);
2461       }
2462     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2463       // Parse Exceptions attribute
2464       if (parsed_checked_exceptions_attribute) {
2465         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2466                               THREAD);
2467         return nullptr;
2468       }
2469       parsed_checked_exceptions_attribute = true;
2470       checked_exceptions_start =
2471             parse_checked_exceptions(cfs,
2472                                      &checked_exceptions_length,
2473                                      method_attribute_length,
2474                                      CHECK_NULL);
2475     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2476       // reject multiple method parameters
2477       if (method_parameters_seen) {
2478         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2479                               THREAD);
2480         return nullptr;
2481       }
2482       method_parameters_seen = true;
2483       method_parameters_length = cfs->get_u1_fast();
2484       const u4 real_length = (method_parameters_length * 4u) + 1u;
2485       if (method_attribute_length != real_length) {
2486         classfile_parse_error(
2487           "Invalid MethodParameters method attribute length %u in class file",
2488           method_attribute_length, THREAD);
2489         return nullptr;
2490       }
2491       method_parameters_data = cfs->current();
2492       cfs->skip_u2_fast(method_parameters_length);
2493       cfs->skip_u2_fast(method_parameters_length);
2494       // ignore this attribute if it cannot be reflected
2495       if (!vmClasses::Parameter_klass_loaded())
2496         method_parameters_length = -1;
2497     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2498       if (method_attribute_length != 0) {
2499         classfile_parse_error(
2500           "Invalid Synthetic method attribute length %u in class file %s",
2501           method_attribute_length, THREAD);
2502         return nullptr;
2503       }
2504       // Should we check that there hasn't already been a synthetic attribute?
2505       access_flags.set_is_synthetic();
2506     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2507       if (method_attribute_length != 0) {
2508         classfile_parse_error(
2509           "Invalid Deprecated method attribute length %u in class file %s",
2510           method_attribute_length, THREAD);
2511         return nullptr;
2512       }
2513     } else if (_major_version >= JAVA_1_5_VERSION) {
2514       if (method_attribute_name == vmSymbols::tag_signature()) {
2515         if (generic_signature_index != 0) {
2516           classfile_parse_error(
2517             "Multiple Signature attributes for method in class file %s",
2518             THREAD);
2519           return nullptr;
2520         }
2521         if (method_attribute_length != 2) {
2522           classfile_parse_error(
2523             "Invalid Signature attribute length %u in class file %s",
2524             method_attribute_length, THREAD);
2525           return nullptr;
2526         }
2527         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2528       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2529         if (runtime_visible_annotations != nullptr) {
2530           classfile_parse_error(
2531             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2532             THREAD);
2533           return nullptr;
2534         }
2535         runtime_visible_annotations_length = method_attribute_length;
2536         runtime_visible_annotations = cfs->current();
2537         assert(runtime_visible_annotations != nullptr, "null visible annotations");
2538         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2539         parse_annotations(cp,
2540                           runtime_visible_annotations,
2541                           runtime_visible_annotations_length,
2542                           &parsed_annotations,
2543                           _loader_data,
2544                           _can_access_vm_annotations);
2545         cfs->skip_u1_fast(runtime_visible_annotations_length);
2546       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2547         if (runtime_invisible_annotations_exists) {
2548           classfile_parse_error(
2549             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2550             THREAD);
2551           return nullptr;
2552         }
2553         runtime_invisible_annotations_exists = true;
2554         if (PreserveAllAnnotations) {
2555           runtime_invisible_annotations_length = method_attribute_length;
2556           runtime_invisible_annotations = cfs->current();
2557           assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
2558         }
2559         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2560       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2561         if (runtime_visible_parameter_annotations != nullptr) {
2562           classfile_parse_error(
2563             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2564             THREAD);
2565           return nullptr;
2566         }
2567         runtime_visible_parameter_annotations_length = method_attribute_length;
2568         runtime_visible_parameter_annotations = cfs->current();
2569         assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2570         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2571       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2572         if (runtime_invisible_parameter_annotations_exists) {
2573           classfile_parse_error(
2574             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2575             THREAD);
2576           return nullptr;
2577         }
2578         runtime_invisible_parameter_annotations_exists = true;
2579         if (PreserveAllAnnotations) {
2580           runtime_invisible_parameter_annotations_length = method_attribute_length;
2581           runtime_invisible_parameter_annotations = cfs->current();
2582           assert(runtime_invisible_parameter_annotations != nullptr,
2583             "null invisible parameter annotations");
2584         }
2585         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2586       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2587         if (annotation_default != nullptr) {
2588           classfile_parse_error(
2589             "Multiple AnnotationDefault attributes for method in class file %s",
2590             THREAD);
2591           return nullptr;
2592         }
2593         annotation_default_length = method_attribute_length;
2594         annotation_default = cfs->current();
2595         assert(annotation_default != nullptr, "null annotation default");
2596         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2597       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2598         if (runtime_visible_type_annotations != nullptr) {
2599           classfile_parse_error(
2600             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2601             THREAD);
2602           return nullptr;
2603         }
2604         runtime_visible_type_annotations_length = method_attribute_length;
2605         runtime_visible_type_annotations = cfs->current();
2606         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2607         // No need for the VM to parse Type annotations
2608         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2609       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2610         if (runtime_invisible_type_annotations_exists) {
2611           classfile_parse_error(
2612             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2613             THREAD);
2614           return nullptr;
2615         } else {
2616           runtime_invisible_type_annotations_exists = true;
2617         }
2618         if (PreserveAllAnnotations) {
2619           runtime_invisible_type_annotations_length = method_attribute_length;
2620           runtime_invisible_type_annotations = cfs->current();
2621           assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
2622         }
2623         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2624       } else {
2625         // Skip unknown attributes
2626         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2627       }
2628     } else {
2629       // Skip unknown attributes
2630       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2631     }
2632   }
2633 
2634   if (linenumber_table != nullptr) {
2635     linenumber_table->write_terminator();
2636     linenumber_table_length = linenumber_table->position();
2637   }
2638 
2639   // Make sure there's at least one Code attribute in non-native/non-abstract method
2640   if (_need_verify) {
2641     guarantee_property(access_flags.is_native() ||
2642                        access_flags.is_abstract() ||
2643                        parsed_code_attribute,
2644                        "Absent Code attribute in method that is not native or abstract in class file %s",
2645                        CHECK_NULL);
2646   }
2647 
2648   // All sizing information for a Method* is finally available, now create it
2649   InlineTableSizes sizes(
2650       total_lvt_length,
2651       linenumber_table_length,
2652       exception_table_length,
2653       checked_exceptions_length,
2654       method_parameters_length,
2655       generic_signature_index,
2656       runtime_visible_annotations_length +
2657            runtime_invisible_annotations_length,
2658       runtime_visible_parameter_annotations_length +
2659            runtime_invisible_parameter_annotations_length,
2660       runtime_visible_type_annotations_length +
2661            runtime_invisible_type_annotations_length,
2662       annotation_default_length,
2663       0);
2664 
2665   Method* const m = Method::allocate(_loader_data,
2666                                      code_length,
2667                                      access_flags,
2668                                      &sizes,
2669                                      ConstMethod::NORMAL,
2670                                      _cp->symbol_at(name_index),
2671                                      CHECK_NULL);
2672 
2673   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2674 
2675   // Fill in information from fixed part (access_flags already set)
2676   m->set_constants(_cp);
2677   m->set_name_index(name_index);
2678   m->set_signature_index(signature_index);
2679   m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2680   assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2681 
2682   // Fill in code attribute information
2683   m->set_max_stack(max_stack);
2684   m->set_max_locals(max_locals);
2685   if (stackmap_data != nullptr) {
2686     m->constMethod()->copy_stackmap_data(_loader_data,
2687                                          (u1*)stackmap_data,
2688                                          stackmap_data_length,
2689                                          CHECK_NULL);
2690   }
2691 
2692   // Copy byte codes
2693   m->set_code((u1*)code_start);
2694 
2695   // Copy line number table
2696   if (linenumber_table != nullptr) {
2697     memcpy(m->compressed_linenumber_table(),
2698            linenumber_table->buffer(),
2699            linenumber_table_length);
2700   }
2701 
2702   // Copy exception table
2703   if (exception_table_length > 0) {
2704     Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2705                                                 m->exception_table_start(),
2706                                                 exception_table_length * sizeof(ExceptionTableElement),
2707                                                 sizeof(u2));
2708   }
2709 
2710   // Copy method parameters
2711   if (method_parameters_length > 0) {
2712     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2713     for (int i = 0; i < method_parameters_length; i++) {
2714       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2715       method_parameters_data += 2;
2716       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2717       method_parameters_data += 2;
2718     }
2719   }
2720 
2721   // Copy checked exceptions
2722   if (checked_exceptions_length > 0) {
2723     Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2724                                                 m->checked_exceptions_start(),
2725                                                 checked_exceptions_length * sizeof(CheckedExceptionElement),
2726                                                 sizeof(u2));
2727   }
2728 
2729   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2730   if (total_lvt_length > 0) {
2731     *has_localvariable_table = true;
2732     copy_localvariable_table(m->constMethod(),
2733                              lvt_cnt,
2734                              localvariable_table_length,
2735                              localvariable_table_start,
2736                              lvtt_cnt,
2737                              localvariable_type_table_length,
2738                              localvariable_type_table_start,
2739                              CHECK_NULL);
2740   }
2741 
2742   if (parsed_annotations.has_any_annotations())
2743     parsed_annotations.apply_to(methodHandle(THREAD, m));
2744 
2745   if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2746     m->set_is_hidden();
2747   }
2748 
2749   // Copy annotations
2750   copy_method_annotations(m->constMethod(),
2751                           runtime_visible_annotations,
2752                           runtime_visible_annotations_length,
2753                           runtime_invisible_annotations,
2754                           runtime_invisible_annotations_length,
2755                           runtime_visible_parameter_annotations,
2756                           runtime_visible_parameter_annotations_length,
2757                           runtime_invisible_parameter_annotations,
2758                           runtime_invisible_parameter_annotations_length,
2759                           runtime_visible_type_annotations,
2760                           runtime_visible_type_annotations_length,
2761                           runtime_invisible_type_annotations,
2762                           runtime_invisible_type_annotations_length,
2763                           annotation_default,
2764                           annotation_default_length,
2765                           CHECK_NULL);
2766 
2767   if (InstanceKlass::is_finalization_enabled() &&
2768       name == vmSymbols::finalize_method_name() &&
2769       signature == vmSymbols::void_method_signature()) {
2770     if (m->is_empty_method()) {
2771       _has_empty_finalizer = true;
2772     } else {
2773       _has_finalizer = true;
2774     }
2775   }
2776   if (name == vmSymbols::object_initializer_name() &&
2777       signature == vmSymbols::void_method_signature() &&
2778       m->is_vanilla_constructor()) {
2779     _has_vanilla_constructor = true;
2780   }
2781 
2782   NOT_PRODUCT(m->verify());
2783   return m;
2784 }
2785 
2786 
2787 // Side-effects: populates the _methods field in the parser
2788 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2789                                     bool is_interface,
2790                                     bool* const has_localvariable_table,
2791                                     bool* has_final_method,
2792                                     bool* declares_nonstatic_concrete_methods,
2793                                     TRAPS) {
2794   assert(cfs != nullptr, "invariant");
2795   assert(has_localvariable_table != nullptr, "invariant");
2796   assert(has_final_method != nullptr, "invariant");
2797   assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2798 
2799   assert(nullptr == _methods, "invariant");
2800 
2801   cfs->guarantee_more(2, CHECK);  // length
2802   const u2 length = cfs->get_u2_fast();
2803   if (length == 0) {
2804     _methods = Universe::the_empty_method_array();
2805   } else {
2806     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2807                                                    length,
2808                                                    nullptr,
2809                                                    CHECK);
2810 
2811     for (int index = 0; index < length; index++) {
2812       Method* method = parse_method(cfs,
2813                                     is_interface,
2814                                     _cp,
2815                                     has_localvariable_table,
2816                                     CHECK);
2817 
2818       if (method->is_final()) {
2819         *has_final_method = true;
2820       }
2821       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2822       // used for interface initialization, and default method inheritance analysis
2823       if (is_interface && !(*declares_nonstatic_concrete_methods)
2824         && !method->is_abstract() && !method->is_static()) {
2825         *declares_nonstatic_concrete_methods = true;
2826       }
2827       _methods->at_put(index, method);
2828     }
2829 
2830     if (_need_verify && length > 1) {
2831       // Check duplicated methods
2832       ResourceMark rm(THREAD);
2833       // Set containing name-signature pairs
2834       NameSigHashtable* names_and_sigs = new NameSigHashtable();
2835       for (int i = 0; i < length; i++) {
2836         const Method* const m = _methods->at(i);
2837         NameSigHash name_and_sig(m->name(), m->signature());
2838         // If no duplicates, add name/signature in hashtable names_and_sigs.
2839         if(!names_and_sigs->put(name_and_sig, 0)) {
2840           classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2841                                  name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2842           return;
2843         }
2844       }
2845     }
2846   }
2847 }
2848 
2849 static const intArray* sort_methods(Array<Method*>* methods) {
2850   const int length = methods->length();
2851   // If JVMTI original method ordering or sharing is enabled we have to
2852   // remember the original class file ordering.
2853   // We temporarily use the vtable_index field in the Method* to store the
2854   // class file index, so we can read in after calling qsort.
2855   // Put the method ordering in the shared archive.
2856   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2857     for (int index = 0; index < length; index++) {
2858       Method* const m = methods->at(index);
2859       assert(!m->valid_vtable_index(), "vtable index should not be set");
2860       m->set_vtable_index(index);
2861     }
2862   }
2863   // Sort method array by ascending method name (for faster lookups & vtable construction)
2864   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2865   Method::sort_methods(methods);
2866 
2867   intArray* method_ordering = nullptr;
2868   // If JVMTI original method ordering or sharing is enabled construct int
2869   // array remembering the original ordering
2870   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2871     method_ordering = new intArray(length, length, -1);
2872     for (int index = 0; index < length; index++) {
2873       Method* const m = methods->at(index);
2874       const int old_index = m->vtable_index();
2875       assert(old_index >= 0 && old_index < length, "invalid method index");
2876       method_ordering->at_put(index, old_index);
2877       m->set_vtable_index(Method::invalid_vtable_index);
2878     }
2879   }
2880   return method_ordering;
2881 }
2882 
2883 // Parse generic_signature attribute for methods and fields
2884 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2885                                                       TRAPS) {
2886   assert(cfs != nullptr, "invariant");
2887 
2888   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2889   const u2 generic_signature_index = cfs->get_u2_fast();
2890   check_property(
2891     valid_symbol_at(generic_signature_index),
2892     "Invalid Signature attribute at constant pool index %u in class file %s",
2893     generic_signature_index, CHECK_0);
2894   return generic_signature_index;
2895 }
2896 
2897 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2898                                                            TRAPS) {
2899 
2900   assert(cfs != nullptr, "invariant");
2901 
2902   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2903   const u2 sourcefile_index = cfs->get_u2_fast();
2904   check_property(
2905     valid_symbol_at(sourcefile_index),
2906     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2907     sourcefile_index, CHECK);
2908   set_class_sourcefile_index(sourcefile_index);
2909 }
2910 
2911 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2912                                                                        int length,
2913                                                                        TRAPS) {
2914   assert(cfs != nullptr, "invariant");
2915 
2916   const u1* const sde_buffer = cfs->current();
2917   assert(sde_buffer != nullptr, "null sde buffer");
2918 
2919   // Don't bother storing it if there is no way to retrieve it
2920   if (JvmtiExport::can_get_source_debug_extension()) {
2921     assert((length+1) > length, "Overflow checking");
2922     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2923     for (int i = 0; i < length; i++) {
2924       sde[i] = sde_buffer[i];
2925     }
2926     sde[length] = '\0';
2927     set_class_sde_buffer((const char*)sde, length);
2928   }
2929   // Got utf8 string, set stream position forward
2930   cfs->skip_u1(length, CHECK);
2931 }
2932 
2933 
2934 // Inner classes can be static, private or protected (classic VM does this)
2935 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2936                                            JVM_ACC_PRIVATE |                \
2937                                            JVM_ACC_PROTECTED |              \
2938                                            JVM_ACC_STATIC                   \
2939                                          )
2940 
2941 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2942 // Return -1 if none is found.
2943 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2944   Symbol* cp_klass_name =  cp->klass_name_at(inner);
2945   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2946     int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2947     if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2948       return idx;
2949     }
2950   }
2951   return -1;
2952 }
2953 
2954 // Return the outer_class_info_index for the InnerClasses entry containing the
2955 // specified inner_class_info_index.  Return -1 if no InnerClasses entry is found.
2956 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2957   if (inner == 0) return -1;
2958   int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2959   if (idx == -1) return -1;
2960   int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2961   return result;
2962 }
2963 
2964 // Return true if circularity is found, false if no circularity is found.
2965 // Use Floyd's cycle finding algorithm.
2966 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2967   int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2968   int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2969 
2970   while (fast != -1 && fast != 0) {
2971     if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2972       return true;  // found a circularity
2973     }
2974     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2975     if (fast == -1) return false;
2976     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2977     if (fast == -1) return false;
2978     slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2979     assert(slow != -1, "sanity check");
2980   }
2981   return false;
2982 }
2983 
2984 // Loop through each InnerClasses entry checking for circularities and duplications
2985 // with other entries.  If duplicate entries are found then throw CFE.  Otherwise,
2986 // return true if a circularity or entries with duplicate inner_class_info_indexes
2987 // are found.
2988 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2989   // Loop through each InnerClasses entry.
2990   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2991     // Return true if there are circular entries.
2992     if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2993       return true;
2994     }
2995     // Check if there are duplicate entries or entries with the same inner_class_info_index.
2996     for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2997          y += InstanceKlass::inner_class_next_offset) {
2998 
2999       // 4347400: make sure there's no duplicate entry in the classes array
3000       if (_major_version >= JAVA_1_5_VERSION) {
3001         guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3002                             _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3003                             _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3004                             _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3005                            "Duplicate entry in InnerClasses attribute in class file %s",
3006                            CHECK_(true));
3007       }
3008       // Return true if there are two entries with the same inner_class_info_index.
3009       if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3010         return true;
3011       }
3012     }
3013   }
3014   return false;
3015 }
3016 
3017 // Return number of classes in the inner classes attribute table
3018 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3019                                                             const ConstantPool* cp,
3020                                                             const u1* const inner_classes_attribute_start,
3021                                                             bool parsed_enclosingmethod_attribute,
3022                                                             u2 enclosing_method_class_index,
3023                                                             u2 enclosing_method_method_index,
3024                                                             TRAPS) {
3025   const u1* const current_mark = cfs->current();
3026   u2 length = 0;
3027   if (inner_classes_attribute_start != nullptr) {
3028     cfs->set_current(inner_classes_attribute_start);
3029     cfs->guarantee_more(2, CHECK_0);  // length
3030     length = cfs->get_u2_fast();
3031   }
3032 
3033   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3034   // method data:
3035   //   [inner_class_info_index,
3036   //    outer_class_info_index,
3037   //    inner_name_index,
3038   //    inner_class_access_flags,
3039   //    ...
3040   //    enclosing_method_class_index,
3041   //    enclosing_method_method_index]
3042   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3043   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3044   _inner_classes = inner_classes;
3045 
3046   int index = 0;
3047   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
3048   for (int n = 0; n < length; n++) {
3049     // Inner class index
3050     const u2 inner_class_info_index = cfs->get_u2_fast();
3051     check_property(
3052       valid_klass_reference_at(inner_class_info_index),
3053       "inner_class_info_index %u has bad constant type in class file %s",
3054       inner_class_info_index, CHECK_0);
3055     // Outer class index
3056     const u2 outer_class_info_index = cfs->get_u2_fast();
3057     check_property(
3058       outer_class_info_index == 0 ||
3059         valid_klass_reference_at(outer_class_info_index),
3060       "outer_class_info_index %u has bad constant type in class file %s",
3061       outer_class_info_index, CHECK_0);
3062 
3063     if (outer_class_info_index != 0) {
3064       const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3065       char* bytes = (char*)outer_class_name->bytes();
3066       guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3067                          "Outer class is an array class in class file %s", CHECK_0);
3068     }
3069     // Inner class name
3070     const u2 inner_name_index = cfs->get_u2_fast();
3071     check_property(
3072       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3073       "inner_name_index %u has bad constant type in class file %s",
3074       inner_name_index, CHECK_0);
3075     if (_need_verify) {
3076       guarantee_property(inner_class_info_index != outer_class_info_index,
3077                          "Class is both outer and inner class in class file %s", CHECK_0);
3078     }
3079     // Access flags
3080     jint flags;
3081     // JVM_ACC_MODULE is defined in JDK-9 and later.
3082     if (_major_version >= JAVA_9_VERSION) {
3083       flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3084     } else {
3085       flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3086     }
3087     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3088       // Set abstract bit for old class files for backward compatibility
3089       flags |= JVM_ACC_ABSTRACT;
3090     }
3091     verify_legal_class_modifiers(flags, CHECK_0);
3092     AccessFlags inner_access_flags(flags);
3093 
3094     inner_classes->at_put(index++, inner_class_info_index);
3095     inner_classes->at_put(index++, outer_class_info_index);
3096     inner_classes->at_put(index++, inner_name_index);
3097     inner_classes->at_put(index++, inner_access_flags.as_short());
3098   }
3099 
3100   // Check for circular and duplicate entries.
3101   bool has_circularity = false;
3102   if (_need_verify) {
3103     has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3104     if (has_circularity) {
3105       // If circularity check failed then ignore InnerClasses attribute.
3106       MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3107       index = 0;
3108       if (parsed_enclosingmethod_attribute) {
3109         inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3110         _inner_classes = inner_classes;
3111       } else {
3112         _inner_classes = Universe::the_empty_short_array();
3113       }
3114     }
3115   }
3116   // Set EnclosingMethod class and method indexes.
3117   if (parsed_enclosingmethod_attribute) {
3118     inner_classes->at_put(index++, enclosing_method_class_index);
3119     inner_classes->at_put(index++, enclosing_method_method_index);
3120   }
3121   assert(index == size || has_circularity, "wrong size");
3122 
3123   // Restore buffer's current position.
3124   cfs->set_current(current_mark);
3125 
3126   return length;
3127 }
3128 
3129 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3130                                                            const u1* const nest_members_attribute_start,
3131                                                            TRAPS) {
3132   const u1* const current_mark = cfs->current();
3133   u2 length = 0;
3134   if (nest_members_attribute_start != nullptr) {
3135     cfs->set_current(nest_members_attribute_start);
3136     cfs->guarantee_more(2, CHECK_0);  // length
3137     length = cfs->get_u2_fast();
3138   }
3139   const int size = length;
3140   Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3141   _nest_members = nest_members;
3142 
3143   int index = 0;
3144   cfs->guarantee_more(2 * length, CHECK_0);
3145   for (int n = 0; n < length; n++) {
3146     const u2 class_info_index = cfs->get_u2_fast();
3147     check_property(
3148       valid_klass_reference_at(class_info_index),
3149       "Nest member class_info_index %u has bad constant type in class file %s",
3150       class_info_index, CHECK_0);
3151     nest_members->at_put(index++, class_info_index);
3152   }
3153   assert(index == size, "wrong size");
3154 
3155   // Restore buffer's current position.
3156   cfs->set_current(current_mark);
3157 
3158   return length;
3159 }
3160 
3161 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3162                                                                    const u1* const permitted_subclasses_attribute_start,
3163                                                                    TRAPS) {
3164   const u1* const current_mark = cfs->current();
3165   u2 length = 0;
3166   if (permitted_subclasses_attribute_start != nullptr) {
3167     cfs->set_current(permitted_subclasses_attribute_start);
3168     cfs->guarantee_more(2, CHECK_0);  // length
3169     length = cfs->get_u2_fast();
3170   }
3171   const int size = length;
3172   Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3173   _permitted_subclasses = permitted_subclasses;
3174 
3175   if (length > 0) {
3176     int index = 0;
3177     cfs->guarantee_more(2 * length, CHECK_0);
3178     for (int n = 0; n < length; n++) {
3179       const u2 class_info_index = cfs->get_u2_fast();
3180       check_property(
3181         valid_klass_reference_at(class_info_index),
3182         "Permitted subclass class_info_index %u has bad constant type in class file %s",
3183         class_info_index, CHECK_0);
3184       permitted_subclasses->at_put(index++, class_info_index);
3185     }
3186     assert(index == size, "wrong size");
3187   }
3188 
3189   // Restore buffer's current position.
3190   cfs->set_current(current_mark);
3191 
3192   return length;
3193 }
3194 
3195 //  Record {
3196 //    u2 attribute_name_index;
3197 //    u4 attribute_length;
3198 //    u2 components_count;
3199 //    component_info components[components_count];
3200 //  }
3201 //  component_info {
3202 //    u2 name_index;
3203 //    u2 descriptor_index
3204 //    u2 attributes_count;
3205 //    attribute_info_attributes[attributes_count];
3206 //  }
3207 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3208                                                      const ConstantPool* cp,
3209                                                      const u1* const record_attribute_start,
3210                                                      TRAPS) {
3211   const u1* const current_mark = cfs->current();
3212   int components_count = 0;
3213   unsigned int calculate_attr_size = 0;
3214   if (record_attribute_start != nullptr) {
3215     cfs->set_current(record_attribute_start);
3216     cfs->guarantee_more(2, CHECK_0);  // num of components
3217     components_count = (int)cfs->get_u2_fast();
3218     calculate_attr_size = 2;
3219   }
3220 
3221   Array<RecordComponent*>* const record_components =
3222     MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3223   _record_components = record_components;
3224 
3225   for (int x = 0; x < components_count; x++) {
3226     cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3227 
3228     const u2 name_index = cfs->get_u2_fast();
3229     check_property(valid_symbol_at(name_index),
3230       "Invalid constant pool index %u for name in Record attribute in class file %s",
3231       name_index, CHECK_0);
3232     const Symbol* const name = cp->symbol_at(name_index);
3233     verify_legal_field_name(name, CHECK_0);
3234 
3235     const u2 descriptor_index = cfs->get_u2_fast();
3236     check_property(valid_symbol_at(descriptor_index),
3237       "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3238       descriptor_index, CHECK_0);
3239     const Symbol* const descr = cp->symbol_at(descriptor_index);
3240     verify_legal_field_signature(name, descr, CHECK_0);
3241 
3242     const u2 attributes_count = cfs->get_u2_fast();
3243     calculate_attr_size += 6;
3244     u2 generic_sig_index = 0;
3245     const u1* runtime_visible_annotations = nullptr;
3246     int runtime_visible_annotations_length = 0;
3247     const u1* runtime_invisible_annotations = nullptr;
3248     int runtime_invisible_annotations_length = 0;
3249     bool runtime_invisible_annotations_exists = false;
3250     const u1* runtime_visible_type_annotations = nullptr;
3251     int runtime_visible_type_annotations_length = 0;
3252     const u1* runtime_invisible_type_annotations = nullptr;
3253     int runtime_invisible_type_annotations_length = 0;
3254     bool runtime_invisible_type_annotations_exists = false;
3255 
3256     // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3257     // and Runtime(In)VisibleTypeAnnotations.  Other attributes are ignored.
3258     for (int y = 0; y < attributes_count; y++) {
3259       cfs->guarantee_more(6, CHECK_0);  // attribute_name_index, attribute_length
3260       const u2 attribute_name_index = cfs->get_u2_fast();
3261       const u4 attribute_length = cfs->get_u4_fast();
3262       calculate_attr_size += 6;
3263       check_property(
3264         valid_symbol_at(attribute_name_index),
3265         "Invalid Record attribute name index %u in class file %s",
3266         attribute_name_index, CHECK_0);
3267 
3268       const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3269       if (attribute_name == vmSymbols::tag_signature()) {
3270         if (generic_sig_index != 0) {
3271           classfile_parse_error(
3272             "Multiple Signature attributes for Record component in class file %s",
3273             THREAD);
3274           return 0;
3275         }
3276         if (attribute_length != 2) {
3277           classfile_parse_error(
3278             "Invalid Signature attribute length %u in Record component in class file %s",
3279             attribute_length, THREAD);
3280           return 0;
3281         }
3282         generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3283 
3284       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3285         if (runtime_visible_annotations != nullptr) {
3286           classfile_parse_error(
3287             "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3288           return 0;
3289         }
3290         runtime_visible_annotations_length = attribute_length;
3291         runtime_visible_annotations = cfs->current();
3292 
3293         assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3294         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3295         cfs->skip_u1_fast(runtime_visible_annotations_length);
3296 
3297       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3298         if (runtime_invisible_annotations_exists) {
3299           classfile_parse_error(
3300             "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3301           return 0;
3302         }
3303         runtime_invisible_annotations_exists = true;
3304         if (PreserveAllAnnotations) {
3305           runtime_invisible_annotations_length = attribute_length;
3306           runtime_invisible_annotations = cfs->current();
3307           assert(runtime_invisible_annotations != nullptr, "null record component invisible annotation");
3308         }
3309         cfs->skip_u1(attribute_length, CHECK_0);
3310 
3311       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3312         if (runtime_visible_type_annotations != nullptr) {
3313           classfile_parse_error(
3314             "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3315           return 0;
3316         }
3317         runtime_visible_type_annotations_length = attribute_length;
3318         runtime_visible_type_annotations = cfs->current();
3319 
3320         assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3321         cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3322         cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3323 
3324       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3325         if (runtime_invisible_type_annotations_exists) {
3326           classfile_parse_error(
3327             "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3328           return 0;
3329         }
3330         runtime_invisible_type_annotations_exists = true;
3331         if (PreserveAllAnnotations) {
3332           runtime_invisible_type_annotations_length = attribute_length;
3333           runtime_invisible_type_annotations = cfs->current();
3334           assert(runtime_invisible_type_annotations != nullptr, "null record component invisible type annotation");
3335         }
3336         cfs->skip_u1(attribute_length, CHECK_0);
3337 
3338       } else {
3339         // Skip unknown attributes
3340         cfs->skip_u1(attribute_length, CHECK_0);
3341       }
3342       calculate_attr_size += attribute_length;
3343     } // End of attributes For loop
3344 
3345     AnnotationArray* annotations = assemble_annotations(runtime_visible_annotations,
3346                                                         runtime_visible_annotations_length,
3347                                                         runtime_invisible_annotations,
3348                                                         runtime_invisible_annotations_length,
3349                                                         CHECK_0);
3350     AnnotationArray* type_annotations = assemble_annotations(runtime_visible_type_annotations,
3351                                                              runtime_visible_type_annotations_length,
3352                                                              runtime_invisible_type_annotations,
3353                                                              runtime_invisible_type_annotations_length,
3354                                                              CHECK_0);
3355 
3356     RecordComponent* record_component =
3357       RecordComponent::allocate(_loader_data, name_index, descriptor_index,
3358                                 attributes_count, generic_sig_index,
3359                                 annotations, type_annotations, CHECK_0);
3360     record_components->at_put(x, record_component);
3361   }  // End of component processing loop
3362 
3363   // Restore buffer's current position.
3364   cfs->set_current(current_mark);
3365   return calculate_attr_size;
3366 }
3367 
3368 void ClassFileParser::parse_classfile_synthetic_attribute() {
3369   set_class_synthetic_flag(true);
3370 }
3371 
3372 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3373   assert(cfs != nullptr, "invariant");
3374 
3375   const u2 signature_index = cfs->get_u2(CHECK);
3376   check_property(
3377     valid_symbol_at(signature_index),
3378     "Invalid constant pool index %u in Signature attribute in class file %s",
3379     signature_index, CHECK);
3380   set_class_generic_signature_index(signature_index);
3381 }
3382 
3383 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3384                                                                   ConstantPool* cp,
3385                                                                   u4 attribute_byte_length,
3386                                                                   TRAPS) {
3387   assert(cfs != nullptr, "invariant");
3388   assert(cp != nullptr, "invariant");
3389 
3390   const u1* const current_start = cfs->current();
3391 
3392   guarantee_property(attribute_byte_length >= sizeof(u2),
3393                      "Invalid BootstrapMethods attribute length %u in class file %s",
3394                      attribute_byte_length,
3395                      CHECK);
3396 
3397   cfs->guarantee_more(attribute_byte_length, CHECK);
3398 
3399   const int attribute_array_length = cfs->get_u2_fast();
3400 
3401   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3402                      "Short length on BootstrapMethods in class file %s",
3403                      CHECK);
3404 
3405 
3406   // The attribute contains a counted array of counted tuples of shorts,
3407   // represending bootstrap specifiers:
3408   //    length*{bootstrap_method_index, argument_count*{argument_index}}
3409   const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3410   // operand_count = number of shorts in attr, except for leading length
3411 
3412   // The attribute is copied into a short[] array.
3413   // The array begins with a series of short[2] pairs, one for each tuple.
3414   const int index_size = (attribute_array_length * 2);
3415 
3416   Array<u2>* const operands =
3417     MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3418 
3419   // Eagerly assign operands so they will be deallocated with the constant
3420   // pool if there is an error.
3421   cp->set_operands(operands);
3422 
3423   int operand_fill_index = index_size;
3424   const int cp_size = cp->length();
3425 
3426   for (int n = 0; n < attribute_array_length; n++) {
3427     // Store a 32-bit offset into the header of the operand array.
3428     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3429 
3430     // Read a bootstrap specifier.
3431     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3432     const u2 bootstrap_method_index = cfs->get_u2_fast();
3433     const u2 argument_count = cfs->get_u2_fast();
3434     check_property(
3435       valid_cp_range(bootstrap_method_index, cp_size) &&
3436       cp->tag_at(bootstrap_method_index).is_method_handle(),
3437       "bootstrap_method_index %u has bad constant type in class file %s",
3438       bootstrap_method_index,
3439       CHECK);
3440 
3441     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3442       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3443       CHECK);
3444 
3445     operands->at_put(operand_fill_index++, bootstrap_method_index);
3446     operands->at_put(operand_fill_index++, argument_count);
3447 
3448     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
3449     for (int j = 0; j < argument_count; j++) {
3450       const u2 argument_index = cfs->get_u2_fast();
3451       check_property(
3452         valid_cp_range(argument_index, cp_size) &&
3453         cp->tag_at(argument_index).is_loadable_constant(),
3454         "argument_index %u has bad constant type in class file %s",
3455         argument_index,
3456         CHECK);
3457       operands->at_put(operand_fill_index++, argument_index);
3458     }
3459   }
3460   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3461                      "Bad length on BootstrapMethods in class file %s",
3462                      CHECK);
3463 }
3464 
3465 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3466                                                  ConstantPool* cp,
3467                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3468                                                  TRAPS) {
3469   assert(cfs != nullptr, "invariant");
3470   assert(cp != nullptr, "invariant");
3471   assert(parsed_annotations != nullptr, "invariant");
3472 
3473   // Set inner classes attribute to default sentinel
3474   _inner_classes = Universe::the_empty_short_array();
3475   // Set nest members attribute to default sentinel
3476   _nest_members = Universe::the_empty_short_array();
3477   // Set _permitted_subclasses attribute to default sentinel
3478   _permitted_subclasses = Universe::the_empty_short_array();
3479   cfs->guarantee_more(2, CHECK);  // attributes_count
3480   u2 attributes_count = cfs->get_u2_fast();
3481   bool parsed_sourcefile_attribute = false;
3482   bool parsed_innerclasses_attribute = false;
3483   bool parsed_nest_members_attribute = false;
3484   bool parsed_permitted_subclasses_attribute = false;
3485   bool parsed_nest_host_attribute = false;
3486   bool parsed_record_attribute = false;
3487   bool parsed_enclosingmethod_attribute = false;
3488   bool parsed_bootstrap_methods_attribute = false;
3489   const u1* runtime_visible_annotations = nullptr;
3490   int runtime_visible_annotations_length = 0;
3491   const u1* runtime_invisible_annotations = nullptr;
3492   int runtime_invisible_annotations_length = 0;
3493   const u1* runtime_visible_type_annotations = nullptr;
3494   int runtime_visible_type_annotations_length = 0;
3495   const u1* runtime_invisible_type_annotations = nullptr;
3496   int runtime_invisible_type_annotations_length = 0;
3497   bool runtime_invisible_type_annotations_exists = false;
3498   bool runtime_invisible_annotations_exists = false;
3499   bool parsed_source_debug_ext_annotations_exist = false;
3500   const u1* inner_classes_attribute_start = nullptr;
3501   u4  inner_classes_attribute_length = 0;
3502   u2  enclosing_method_class_index = 0;
3503   u2  enclosing_method_method_index = 0;
3504   const u1* nest_members_attribute_start = nullptr;
3505   u4  nest_members_attribute_length = 0;
3506   const u1* record_attribute_start = nullptr;
3507   u4  record_attribute_length = 0;
3508   const u1* permitted_subclasses_attribute_start = nullptr;
3509   u4  permitted_subclasses_attribute_length = 0;
3510 
3511   // Iterate over attributes
3512   while (attributes_count--) {
3513     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3514     const u2 attribute_name_index = cfs->get_u2_fast();
3515     const u4 attribute_length = cfs->get_u4_fast();
3516     check_property(
3517       valid_symbol_at(attribute_name_index),
3518       "Attribute name has bad constant pool index %u in class file %s",
3519       attribute_name_index, CHECK);
3520     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3521     if (tag == vmSymbols::tag_source_file()) {
3522       // Check for SourceFile tag
3523       if (_need_verify) {
3524         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3525       }
3526       if (parsed_sourcefile_attribute) {
3527         classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3528         return;
3529       } else {
3530         parsed_sourcefile_attribute = true;
3531       }
3532       parse_classfile_sourcefile_attribute(cfs, CHECK);
3533     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3534       // Check for SourceDebugExtension tag
3535       if (parsed_source_debug_ext_annotations_exist) {
3536         classfile_parse_error(
3537           "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3538         return;
3539       }
3540       parsed_source_debug_ext_annotations_exist = true;
3541       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3542     } else if (tag == vmSymbols::tag_inner_classes()) {
3543       // Check for InnerClasses tag
3544       if (parsed_innerclasses_attribute) {
3545         classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3546         return;
3547       } else {
3548         parsed_innerclasses_attribute = true;
3549       }
3550       inner_classes_attribute_start = cfs->current();
3551       inner_classes_attribute_length = attribute_length;
3552       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3553     } else if (tag == vmSymbols::tag_synthetic()) {
3554       // Check for Synthetic tag
3555       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3556       if (attribute_length != 0) {
3557         classfile_parse_error(
3558           "Invalid Synthetic classfile attribute length %u in class file %s",
3559           attribute_length, THREAD);
3560         return;
3561       }
3562       parse_classfile_synthetic_attribute();
3563     } else if (tag == vmSymbols::tag_deprecated()) {
3564       // Check for Deprecated tag - 4276120
3565       if (attribute_length != 0) {
3566         classfile_parse_error(
3567           "Invalid Deprecated classfile attribute length %u in class file %s",
3568           attribute_length, THREAD);
3569         return;
3570       }
3571     } else if (_major_version >= JAVA_1_5_VERSION) {
3572       if (tag == vmSymbols::tag_signature()) {
3573         if (_generic_signature_index != 0) {
3574           classfile_parse_error(
3575             "Multiple Signature attributes in class file %s", THREAD);
3576           return;
3577         }
3578         if (attribute_length != 2) {
3579           classfile_parse_error(
3580             "Wrong Signature attribute length %u in class file %s",
3581             attribute_length, THREAD);
3582           return;
3583         }
3584         parse_classfile_signature_attribute(cfs, CHECK);
3585       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3586         if (runtime_visible_annotations != nullptr) {
3587           classfile_parse_error(
3588             "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3589           return;
3590         }
3591         runtime_visible_annotations_length = attribute_length;
3592         runtime_visible_annotations = cfs->current();
3593         assert(runtime_visible_annotations != nullptr, "null visible annotations");
3594         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3595         parse_annotations(cp,
3596                           runtime_visible_annotations,
3597                           runtime_visible_annotations_length,
3598                           parsed_annotations,
3599                           _loader_data,
3600                           _can_access_vm_annotations);
3601         cfs->skip_u1_fast(runtime_visible_annotations_length);
3602       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3603         if (runtime_invisible_annotations_exists) {
3604           classfile_parse_error(
3605             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3606           return;
3607         }
3608         runtime_invisible_annotations_exists = true;
3609         if (PreserveAllAnnotations) {
3610           runtime_invisible_annotations_length = attribute_length;
3611           runtime_invisible_annotations = cfs->current();
3612           assert(runtime_invisible_annotations != nullptr, "null invisible annotations");
3613         }
3614         cfs->skip_u1(attribute_length, CHECK);
3615       } else if (tag == vmSymbols::tag_enclosing_method()) {
3616         if (parsed_enclosingmethod_attribute) {
3617           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3618           return;
3619         } else {
3620           parsed_enclosingmethod_attribute = true;
3621         }
3622         guarantee_property(attribute_length == 4,
3623           "Wrong EnclosingMethod attribute length %u in class file %s",
3624           attribute_length, CHECK);
3625         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3626         enclosing_method_class_index  = cfs->get_u2_fast();
3627         enclosing_method_method_index = cfs->get_u2_fast();
3628         if (enclosing_method_class_index == 0) {
3629           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3630           return;
3631         }
3632         // Validate the constant pool indices and types
3633         check_property(valid_klass_reference_at(enclosing_method_class_index),
3634           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3635         if (enclosing_method_method_index != 0 &&
3636             (!cp->is_within_bounds(enclosing_method_method_index) ||
3637              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3638           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3639           return;
3640         }
3641       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3642                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3643         if (parsed_bootstrap_methods_attribute) {
3644           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3645           return;
3646         }
3647         parsed_bootstrap_methods_attribute = true;
3648         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3649       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3650         if (runtime_visible_type_annotations != nullptr) {
3651           classfile_parse_error(
3652             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3653           return;
3654         }
3655         runtime_visible_type_annotations_length = attribute_length;
3656         runtime_visible_type_annotations = cfs->current();
3657         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3658         // No need for the VM to parse Type annotations
3659         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3660       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3661         if (runtime_invisible_type_annotations_exists) {
3662           classfile_parse_error(
3663             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3664           return;
3665         } else {
3666           runtime_invisible_type_annotations_exists = true;
3667         }
3668         if (PreserveAllAnnotations) {
3669           runtime_invisible_type_annotations_length = attribute_length;
3670           runtime_invisible_type_annotations = cfs->current();
3671           assert(runtime_invisible_type_annotations != nullptr, "null invisible type annotations");
3672         }
3673         cfs->skip_u1(attribute_length, CHECK);
3674       } else if (_major_version >= JAVA_11_VERSION) {
3675         if (tag == vmSymbols::tag_nest_members()) {
3676           // Check for NestMembers tag
3677           if (parsed_nest_members_attribute) {
3678             classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3679             return;
3680           } else {
3681             parsed_nest_members_attribute = true;
3682           }
3683           if (parsed_nest_host_attribute) {
3684             classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3685             return;
3686           }
3687           nest_members_attribute_start = cfs->current();
3688           nest_members_attribute_length = attribute_length;
3689           cfs->skip_u1(nest_members_attribute_length, CHECK);
3690         } else if (tag == vmSymbols::tag_nest_host()) {
3691           if (parsed_nest_host_attribute) {
3692             classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3693             return;
3694           } else {
3695             parsed_nest_host_attribute = true;
3696           }
3697           if (parsed_nest_members_attribute) {
3698             classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3699             return;
3700           }
3701           if (_need_verify) {
3702             guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3703           }
3704           cfs->guarantee_more(2, CHECK);
3705           u2 class_info_index = cfs->get_u2_fast();
3706           check_property(
3707                          valid_klass_reference_at(class_info_index),
3708                          "Nest-host class_info_index %u has bad constant type in class file %s",
3709                          class_info_index, CHECK);
3710           _nest_host = class_info_index;
3711 
3712         } else if (_major_version >= JAVA_16_VERSION) {
3713           if (tag == vmSymbols::tag_record()) {
3714             if (parsed_record_attribute) {
3715               classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3716               return;
3717             }
3718             parsed_record_attribute = true;
3719             record_attribute_start = cfs->current();
3720             record_attribute_length = attribute_length;
3721           } else if (_major_version >= JAVA_17_VERSION) {
3722             if (tag == vmSymbols::tag_permitted_subclasses()) {
3723               if (parsed_permitted_subclasses_attribute) {
3724                 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3725                 return;
3726               }
3727               // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3728               if (_access_flags.is_final()) {
3729                 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3730                 return;
3731               }
3732               parsed_permitted_subclasses_attribute = true;
3733               permitted_subclasses_attribute_start = cfs->current();
3734               permitted_subclasses_attribute_length = attribute_length;
3735             }
3736           }
3737           // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3738           cfs->skip_u1(attribute_length, CHECK);
3739         } else {
3740           // Unknown attribute
3741           cfs->skip_u1(attribute_length, CHECK);
3742         }
3743       } else {
3744         // Unknown attribute
3745         cfs->skip_u1(attribute_length, CHECK);
3746       }
3747     } else {
3748       // Unknown attribute
3749       cfs->skip_u1(attribute_length, CHECK);
3750     }
3751   }
3752   _class_annotations = assemble_annotations(runtime_visible_annotations,
3753                                             runtime_visible_annotations_length,
3754                                             runtime_invisible_annotations,
3755                                             runtime_invisible_annotations_length,
3756                                             CHECK);
3757   _class_type_annotations = assemble_annotations(runtime_visible_type_annotations,
3758                                                  runtime_visible_type_annotations_length,
3759                                                  runtime_invisible_type_annotations,
3760                                                  runtime_invisible_type_annotations_length,
3761                                                  CHECK);
3762 
3763   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3764     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3765                             cfs,
3766                             cp,
3767                             inner_classes_attribute_start,
3768                             parsed_innerclasses_attribute,
3769                             enclosing_method_class_index,
3770                             enclosing_method_method_index,
3771                             CHECK);
3772     if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3773       guarantee_property(
3774         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3775         "Wrong InnerClasses attribute length in class file %s", CHECK);
3776     }
3777   }
3778 
3779   if (parsed_nest_members_attribute) {
3780     const u2 num_of_classes = parse_classfile_nest_members_attribute(
3781                             cfs,
3782                             nest_members_attribute_start,
3783                             CHECK);
3784     if (_need_verify) {
3785       guarantee_property(
3786         nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3787         "Wrong NestMembers attribute length in class file %s", CHECK);
3788     }
3789   }
3790 
3791   if (parsed_record_attribute) {
3792     const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3793                             cfs,
3794                             cp,
3795                             record_attribute_start,
3796                             CHECK);
3797     if (_need_verify) {
3798       guarantee_property(record_attribute_length == calculated_attr_length,
3799                          "Record attribute has wrong length in class file %s",
3800                          CHECK);
3801     }
3802   }
3803 
3804   if (parsed_permitted_subclasses_attribute) {
3805     const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3806                             cfs,
3807                             permitted_subclasses_attribute_start,
3808                             CHECK);
3809     if (_need_verify) {
3810       guarantee_property(
3811         permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3812         "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3813     }
3814   }
3815 
3816   if (_max_bootstrap_specifier_index >= 0) {
3817     guarantee_property(parsed_bootstrap_methods_attribute,
3818                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3819   }
3820 }
3821 
3822 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3823   assert(k != nullptr, "invariant");
3824 
3825   if (_synthetic_flag)
3826     k->set_is_synthetic();
3827   if (_sourcefile_index != 0) {
3828     k->set_source_file_name_index(_sourcefile_index);
3829   }
3830   if (_generic_signature_index != 0) {
3831     k->set_generic_signature_index(_generic_signature_index);
3832   }
3833   if (_sde_buffer != nullptr) {
3834     k->set_source_debug_extension(_sde_buffer, _sde_length);
3835   }
3836 }
3837 
3838 // Create the Annotations object that will
3839 // hold the annotations array for the Klass.
3840 void ClassFileParser::create_combined_annotations(TRAPS) {
3841     if (_class_annotations == nullptr &&
3842         _class_type_annotations == nullptr &&
3843         _fields_annotations == nullptr &&
3844         _fields_type_annotations == nullptr) {
3845       // Don't create the Annotations object unnecessarily.
3846       return;
3847     }
3848 
3849     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3850     annotations->set_class_annotations(_class_annotations);
3851     annotations->set_class_type_annotations(_class_type_annotations);
3852     annotations->set_fields_annotations(_fields_annotations);
3853     annotations->set_fields_type_annotations(_fields_type_annotations);
3854 
3855     // This is the Annotations object that will be
3856     // assigned to InstanceKlass being constructed.
3857     _combined_annotations = annotations;
3858 
3859     // The annotations arrays below has been transferred the
3860     // _combined_annotations so these fields can now be cleared.
3861     _class_annotations       = nullptr;
3862     _class_type_annotations  = nullptr;
3863     _fields_annotations      = nullptr;
3864     _fields_type_annotations = nullptr;
3865 }
3866 
3867 // Transfer ownership of metadata allocated to the InstanceKlass.
3868 void ClassFileParser::apply_parsed_class_metadata(
3869                                             InstanceKlass* this_klass,
3870                                             int java_fields_count) {
3871   assert(this_klass != nullptr, "invariant");
3872 
3873   _cp->set_pool_holder(this_klass);
3874   this_klass->set_constants(_cp);
3875   this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3876   this_klass->set_fields_status(_fields_status);
3877   this_klass->set_methods(_methods);
3878   this_klass->set_inner_classes(_inner_classes);
3879   this_klass->set_nest_members(_nest_members);
3880   this_klass->set_nest_host_index(_nest_host);
3881   this_klass->set_annotations(_combined_annotations);
3882   this_klass->set_permitted_subclasses(_permitted_subclasses);
3883   this_klass->set_record_components(_record_components);
3884   // Delay the setting of _local_interfaces and _transitive_interfaces until after
3885   // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3886   // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3887   // its _super. If an OOM occurs while loading the current klass, its _super field
3888   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3889   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3890   // dereferences to the deallocated _transitive_interfaces will result in a crash.
3891 
3892   // Clear out these fields so they don't get deallocated by the destructor
3893   clear_class_metadata();
3894 }
3895 
3896 AnnotationArray* ClassFileParser::assemble_annotations(const u1* const runtime_visible_annotations,
3897                                                        int runtime_visible_annotations_length,
3898                                                        const u1* const runtime_invisible_annotations,
3899                                                        int runtime_invisible_annotations_length,
3900                                                        TRAPS) {
3901   AnnotationArray* annotations = nullptr;
3902   if (runtime_visible_annotations != nullptr ||
3903       runtime_invisible_annotations != nullptr) {
3904     annotations = MetadataFactory::new_array<u1>(_loader_data,
3905                                           runtime_visible_annotations_length +
3906                                           runtime_invisible_annotations_length,
3907                                           CHECK_(annotations));
3908     if (runtime_visible_annotations != nullptr) {
3909       for (int i = 0; i < runtime_visible_annotations_length; i++) {
3910         annotations->at_put(i, runtime_visible_annotations[i]);
3911       }
3912     }
3913     if (runtime_invisible_annotations != nullptr) {
3914       for (int i = 0; i < runtime_invisible_annotations_length; i++) {
3915         int append = runtime_visible_annotations_length+i;
3916         annotations->at_put(append, runtime_invisible_annotations[i]);
3917       }
3918     }
3919   }
3920   return annotations;
3921 }
3922 
3923 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3924                                                         const int super_class_index,
3925                                                         const bool need_verify,
3926                                                         TRAPS) {
3927   assert(cp != nullptr, "invariant");
3928   const InstanceKlass* super_klass = nullptr;
3929 
3930   if (super_class_index == 0) {
3931     check_property(_class_name == vmSymbols::java_lang_Object(),
3932                    "Invalid superclass index %u in class file %s",
3933                    super_class_index,
3934                    CHECK_NULL);
3935   } else {
3936     check_property(valid_klass_reference_at(super_class_index),
3937                    "Invalid superclass index %u in class file %s",
3938                    super_class_index,
3939                    CHECK_NULL);
3940     // The class name should be legal because it is checked when parsing constant pool.
3941     // However, make sure it is not an array type.
3942     bool is_array = false;
3943     if (cp->tag_at(super_class_index).is_klass()) {
3944       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3945       if (need_verify)
3946         is_array = super_klass->is_array_klass();
3947     } else if (need_verify) {
3948       is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3949     }
3950     if (need_verify) {
3951       guarantee_property(!is_array,
3952                         "Bad superclass name in class file %s", CHECK_NULL);
3953     }
3954   }
3955   return super_klass;
3956 }
3957 
3958 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3959   _max_nonstatic_oop_maps = max_blocks;
3960   _nonstatic_oop_map_count = 0;
3961   if (max_blocks == 0) {
3962     _nonstatic_oop_maps = nullptr;
3963   } else {
3964     _nonstatic_oop_maps =
3965         NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3966     memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3967   }
3968 }
3969 
3970 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3971   assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3972   return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3973 }
3974 
3975 // addition of super oop maps
3976 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3977   assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3978          nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3979 
3980   memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3981   _nonstatic_oop_map_count += nof_blocks;
3982 }
3983 
3984 // collection of oops
3985 void OopMapBlocksBuilder::add(int offset, int count) {
3986   if (_nonstatic_oop_map_count == 0) {
3987     _nonstatic_oop_map_count++;
3988   }
3989   OopMapBlock* nonstatic_oop_map = last_oop_map();
3990   if (nonstatic_oop_map->count() == 0) {  // Unused map, set it up
3991     nonstatic_oop_map->set_offset(offset);
3992     nonstatic_oop_map->set_count(count);
3993   } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
3994     nonstatic_oop_map->increment_count(count);
3995   } else { // Need a new one...
3996     _nonstatic_oop_map_count++;
3997     assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
3998     nonstatic_oop_map = last_oop_map();
3999     nonstatic_oop_map->set_offset(offset);
4000     nonstatic_oop_map->set_count(count);
4001   }
4002 }
4003 
4004 // general purpose copy, e.g. into allocated instanceKlass
4005 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4006   if (_nonstatic_oop_map_count != 0) {
4007     memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4008   }
4009 }
4010 
4011 // Sort and compact adjacent blocks
4012 void OopMapBlocksBuilder::compact() {
4013   if (_nonstatic_oop_map_count <= 1) {
4014     return;
4015   }
4016   /*
4017    * Since field layout sneaks in oops before values, we will be able to condense
4018    * blocks. There is potential to compact between super, own refs and values
4019    * containing refs.
4020    *
4021    * Currently compaction is slightly limited due to values being 8 byte aligned.
4022    * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4023    * and maybe it doesn't need to be.
4024    */
4025   qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4026         (_sort_Fn)OopMapBlock::compare_offset);
4027   if (_nonstatic_oop_map_count < 2) {
4028     return;
4029   }
4030 
4031   // Make a temp copy, and iterate through and copy back into the original
4032   ResourceMark rm;
4033   OopMapBlock* oop_maps_copy =
4034       NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4035   OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4036   copy(oop_maps_copy);
4037   OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4038   unsigned int new_count = 1;
4039   oop_maps_copy++;
4040   while(oop_maps_copy < oop_maps_copy_end) {
4041     assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4042     if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4043       nonstatic_oop_map->increment_count(oop_maps_copy->count());
4044     } else {
4045       nonstatic_oop_map++;
4046       new_count++;
4047       nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4048       nonstatic_oop_map->set_count(oop_maps_copy->count());
4049     }
4050     oop_maps_copy++;
4051   }
4052   assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4053   _nonstatic_oop_map_count = new_count;
4054 }
4055 
4056 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4057   st->print_cr("  OopMapBlocks: %3d  /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4058   if (_nonstatic_oop_map_count > 0) {
4059     OopMapBlock* map = _nonstatic_oop_maps;
4060     OopMapBlock* last_map = last_oop_map();
4061     assert(map <= last_map, "Last less than first");
4062     while (map <= last_map) {
4063       st->print_cr("    Offset: %3d  -%3d Count: %3d", map->offset(),
4064                    map->offset() + map->offset_span() - heapOopSize, map->count());
4065       map++;
4066     }
4067   }
4068 }
4069 
4070 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4071   print_on(st);
4072 }
4073 
4074 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4075   assert(ik != nullptr, "invariant");
4076 
4077   const InstanceKlass* const super = ik->java_super();
4078 
4079   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4080   // in which case we don't have to register objects as finalizable
4081   if (!_has_empty_finalizer) {
4082     if (_has_finalizer ||
4083         (super != nullptr && super->has_finalizer())) {
4084       ik->set_has_finalizer();
4085     }
4086   }
4087 
4088 #ifdef ASSERT
4089   bool f = false;
4090   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4091                                            vmSymbols::void_method_signature());
4092   if (InstanceKlass::is_finalization_enabled() &&
4093       (m != nullptr) && !m->is_empty_method()) {
4094       f = true;
4095   }
4096 
4097   // Spec doesn't prevent agent from redefinition of empty finalizer.
4098   // Despite the fact that it's generally bad idea and redefined finalizer
4099   // will not work as expected we shouldn't abort vm in this case
4100   if (!ik->has_redefined_this_or_super()) {
4101     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4102   }
4103 #endif
4104 
4105   // Check if this klass supports the java.lang.Cloneable interface
4106   if (vmClasses::Cloneable_klass_loaded()) {
4107     if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4108       ik->set_is_cloneable();
4109     }
4110   }
4111 
4112   // Check if this klass has a vanilla default constructor
4113   if (super == nullptr) {
4114     // java.lang.Object has empty default constructor
4115     ik->set_has_vanilla_constructor();
4116   } else {
4117     if (super->has_vanilla_constructor() &&
4118         _has_vanilla_constructor) {
4119       ik->set_has_vanilla_constructor();
4120     }
4121 #ifdef ASSERT
4122     bool v = false;
4123     if (super->has_vanilla_constructor()) {
4124       const Method* const constructor =
4125         ik->find_method(vmSymbols::object_initializer_name(),
4126                        vmSymbols::void_method_signature());
4127       if (constructor != nullptr && constructor->is_vanilla_constructor()) {
4128         v = true;
4129       }
4130     }
4131     assert(v == ik->has_vanilla_constructor(), "inconsistent has_vanilla_constructor");
4132 #endif
4133   }
4134 
4135   // If it cannot be fast-path allocated, set a bit in the layout helper.
4136   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4137   assert(ik->size_helper() > 0, "layout_helper is initialized");
4138   if ((!RegisterFinalizersAtInit && ik->has_finalizer())
4139       || ik->is_abstract() || ik->is_interface()
4140       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4141       || ik->size_helper() >= FastAllocateSizeLimit) {
4142     // Forbid fast-path allocation.
4143     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4144     ik->set_layout_helper(lh);
4145   }
4146 }
4147 
4148 // utility methods for appending an array with check for duplicates
4149 
4150 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4151                               const Array<InstanceKlass*>* const ifs) {
4152   // iterate over new interfaces
4153   for (int i = 0; i < ifs->length(); i++) {
4154     InstanceKlass* const e = ifs->at(i);
4155     assert(e->is_klass() && e->is_interface(), "just checking");
4156     // add new interface
4157     result->append_if_missing(e);
4158   }
4159 }
4160 
4161 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4162                                                             Array<InstanceKlass*>* local_ifs,
4163                                                             ClassLoaderData* loader_data,
4164                                                             TRAPS) {
4165   assert(local_ifs != nullptr, "invariant");
4166   assert(loader_data != nullptr, "invariant");
4167 
4168   // Compute maximum size for transitive interfaces
4169   int max_transitive_size = 0;
4170   int super_size = 0;
4171   // Add superclass transitive interfaces size
4172   if (super != nullptr) {
4173     super_size = super->transitive_interfaces()->length();
4174     max_transitive_size += super_size;
4175   }
4176   // Add local interfaces' super interfaces
4177   const int local_size = local_ifs->length();
4178   for (int i = 0; i < local_size; i++) {
4179     InstanceKlass* const l = local_ifs->at(i);
4180     max_transitive_size += l->transitive_interfaces()->length();
4181   }
4182   // Finally add local interfaces
4183   max_transitive_size += local_size;
4184   // Construct array
4185   if (max_transitive_size == 0) {
4186     // no interfaces, use canonicalized array
4187     return Universe::the_empty_instance_klass_array();
4188   } else if (max_transitive_size == super_size) {
4189     // no new local interfaces added, share superklass' transitive interface array
4190     return super->transitive_interfaces();
4191   } else if (max_transitive_size == local_size) {
4192     // only local interfaces added, share local interface array
4193     return local_ifs;
4194   } else {
4195     ResourceMark rm;
4196     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4197 
4198     // Copy down from superclass
4199     if (super != nullptr) {
4200       append_interfaces(result, super->transitive_interfaces());
4201     }
4202 
4203     // Copy down from local interfaces' superinterfaces
4204     for (int i = 0; i < local_size; i++) {
4205       InstanceKlass* const l = local_ifs->at(i);
4206       append_interfaces(result, l->transitive_interfaces());
4207     }
4208     // Finally add local interfaces
4209     append_interfaces(result, local_ifs);
4210 
4211     // length will be less than the max_transitive_size if duplicates were removed
4212     const int length = result->length();
4213     assert(length <= max_transitive_size, "just checking");
4214     Array<InstanceKlass*>* const new_result =
4215       MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4216     for (int i = 0; i < length; i++) {
4217       InstanceKlass* const e = result->at(i);
4218       assert(e != nullptr, "just checking");
4219       new_result->at_put(i, e);
4220     }
4221     return new_result;
4222   }
4223 }
4224 
4225 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4226   assert(this_klass != nullptr, "invariant");
4227   const Klass* const super = this_klass->super();
4228 
4229   if (super != nullptr) {
4230     const InstanceKlass* super_ik = InstanceKlass::cast(super);
4231 
4232     if (super->is_final()) {
4233       classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD);
4234       return;
4235     }
4236 
4237     if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) {
4238       classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD);
4239       return;
4240     }
4241 
4242     // If the loader is not the boot loader then throw an exception if its
4243     // superclass is in package jdk.internal.reflect and its loader is not a
4244     // special reflection class loader
4245     if (!this_klass->class_loader_data()->is_the_null_class_loader_data()) {
4246       PackageEntry* super_package = super->package();
4247       if (super_package != nullptr &&
4248           super_package->name()->fast_compare(vmSymbols::jdk_internal_reflect()) == 0 &&
4249           !java_lang_ClassLoader::is_reflection_class_loader(this_klass->class_loader())) {
4250         ResourceMark rm(THREAD);
4251         Exceptions::fthrow(
4252           THREAD_AND_LOCATION,
4253           vmSymbols::java_lang_IllegalAccessError(),
4254           "class %s loaded by %s cannot access jdk/internal/reflect superclass %s",
4255           this_klass->external_name(),
4256           this_klass->class_loader_data()->loader_name_and_id(),
4257           super->external_name());
4258         return;
4259       }
4260     }
4261 
4262     Reflection::VerifyClassAccessResults vca_result =
4263       Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4264     if (vca_result != Reflection::ACCESS_OK) {
4265       ResourceMark rm(THREAD);
4266       char* msg = Reflection::verify_class_access_msg(this_klass,
4267                                                       InstanceKlass::cast(super),
4268                                                       vca_result);
4269       if (msg == nullptr) {
4270         bool same_module = (this_klass->module() == super->module());
4271         Exceptions::fthrow(
4272           THREAD_AND_LOCATION,
4273           vmSymbols::java_lang_IllegalAccessError(),
4274           "class %s cannot access its %ssuperclass %s (%s%s%s)",
4275           this_klass->external_name(),
4276           super->is_abstract() ? "abstract " : "",
4277           super->external_name(),
4278           (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4279           (same_module) ? "" : "; ",
4280           (same_module) ? "" : super->class_in_module_of_loader());
4281       } else {
4282         // Add additional message content.
4283         Exceptions::fthrow(
4284           THREAD_AND_LOCATION,
4285           vmSymbols::java_lang_IllegalAccessError(),
4286           "superclass access check failed: %s",
4287           msg);
4288       }
4289     }
4290   }
4291 }
4292 
4293 
4294 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4295   assert(this_klass != nullptr, "invariant");
4296   const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4297   const int lng = local_interfaces->length();
4298   for (int i = lng - 1; i >= 0; i--) {
4299     InstanceKlass* const k = local_interfaces->at(i);
4300     assert (k != nullptr && k->is_interface(), "invalid interface");
4301 
4302     if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) {
4303       classfile_icce_error(this_klass->is_interface() ?
4304                              "class %s cannot extend sealed interface %s" :
4305                              "class %s cannot implement sealed interface %s",
4306                            k, THREAD);
4307       return;
4308     }
4309 
4310     Reflection::VerifyClassAccessResults vca_result =
4311       Reflection::verify_class_access(this_klass, k, false);
4312     if (vca_result != Reflection::ACCESS_OK) {
4313       ResourceMark rm(THREAD);
4314       char* msg = Reflection::verify_class_access_msg(this_klass,
4315                                                       k,
4316                                                       vca_result);
4317       if (msg == nullptr) {
4318         bool same_module = (this_klass->module() == k->module());
4319         Exceptions::fthrow(
4320           THREAD_AND_LOCATION,
4321           vmSymbols::java_lang_IllegalAccessError(),
4322           "class %s cannot access its superinterface %s (%s%s%s)",
4323           this_klass->external_name(),
4324           k->external_name(),
4325           (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4326           (same_module) ? "" : "; ",
4327           (same_module) ? "" : k->class_in_module_of_loader());
4328         return;
4329       } else {
4330         // Add additional message content.
4331         Exceptions::fthrow(
4332           THREAD_AND_LOCATION,
4333           vmSymbols::java_lang_IllegalAccessError(),
4334           "superinterface check failed: %s",
4335           msg);
4336         return;
4337       }
4338     }
4339   }
4340 }
4341 
4342 
4343 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4344   assert(this_klass != nullptr, "invariant");
4345   const Array<Method*>* const methods = this_klass->methods();
4346   const int num_methods = methods->length();
4347 
4348   // go thru each method and check if it overrides a final method
4349   for (int index = 0; index < num_methods; index++) {
4350     const Method* const m = methods->at(index);
4351 
4352     // skip private, static, and <init> methods
4353     if ((!m->is_private() && !m->is_static()) &&
4354         (m->name() != vmSymbols::object_initializer_name())) {
4355 
4356       const Symbol* const name = m->name();
4357       const Symbol* const signature = m->signature();
4358       const InstanceKlass* k = this_klass->java_super();
4359       const Method* super_m = nullptr;
4360       while (k != nullptr) {
4361         // skip supers that don't have final methods.
4362         if (k->has_final_method()) {
4363           // lookup a matching method in the super class hierarchy
4364           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4365           if (super_m == nullptr) {
4366             break; // didn't find any match; get out
4367           }
4368 
4369           if (super_m->is_final() && !super_m->is_static() &&
4370               !super_m->access_flags().is_private()) {
4371             // matching method in super is final, and not static or private
4372             bool can_access = Reflection::verify_member_access(this_klass,
4373                                                                super_m->method_holder(),
4374                                                                super_m->method_holder(),
4375                                                                super_m->access_flags(),
4376                                                               false, false, CHECK);
4377             if (can_access) {
4378               // this class can access super final method and therefore override
4379               ResourceMark rm(THREAD);
4380               THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4381                         err_msg("class %s overrides final method %s.%s%s",
4382                                 this_klass->external_name(),
4383                                 super_m->method_holder()->external_name(),
4384                                 name->as_C_string(),
4385                                 signature->as_C_string()));
4386             }
4387           }
4388 
4389           // continue to look from super_m's holder's super.
4390           k = super_m->method_holder()->java_super();
4391           continue;
4392         }
4393 
4394         k = k->java_super();
4395       }
4396     }
4397   }
4398 }
4399 
4400 
4401 // assumes that this_klass is an interface
4402 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4403   assert(this_klass != nullptr, "invariant");
4404   assert(this_klass->is_interface(), "not an interface");
4405   const Array<Method*>* methods = this_klass->methods();
4406   const int num_methods = methods->length();
4407 
4408   for (int index = 0; index < num_methods; index++) {
4409     const Method* const m = methods->at(index);
4410     // if m is static and not the init method, throw a verify error
4411     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4412       ResourceMark rm(THREAD);
4413       Exceptions::fthrow(
4414         THREAD_AND_LOCATION,
4415         vmSymbols::java_lang_VerifyError(),
4416         "Illegal static method %s in interface %s",
4417         m->name()->as_C_string(),
4418         this_klass->external_name()
4419       );
4420       return;
4421     }
4422   }
4423 }
4424 
4425 // utility methods for format checking
4426 
4427 void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const {
4428   const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4429   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4430   if (is_module) {
4431     ResourceMark rm(THREAD);
4432     Exceptions::fthrow(
4433       THREAD_AND_LOCATION,
4434       vmSymbols::java_lang_NoClassDefFoundError(),
4435       "%s is not a class because access_flag ACC_MODULE is set",
4436       _class_name->as_C_string());
4437     return;
4438   }
4439 
4440   if (!_need_verify) { return; }
4441 
4442   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4443   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4444   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4445   const bool is_super      = (flags & JVM_ACC_SUPER)      != 0;
4446   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4447   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4448   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4449 
4450   if ((is_abstract && is_final) ||
4451       (is_interface && !is_abstract) ||
4452       (is_interface && major_gte_1_5 && (is_super || is_enum)) ||
4453       (!is_interface && major_gte_1_5 && is_annotation)) {
4454     ResourceMark rm(THREAD);
4455     Exceptions::fthrow(
4456       THREAD_AND_LOCATION,
4457       vmSymbols::java_lang_ClassFormatError(),
4458       "Illegal class modifiers in class %s: 0x%X",
4459       _class_name->as_C_string(), flags
4460     );
4461     return;
4462   }
4463 }
4464 
4465 static bool has_illegal_visibility(jint flags) {
4466   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4467   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4468   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4469 
4470   return ((is_public && is_protected) ||
4471           (is_public && is_private) ||
4472           (is_protected && is_private));
4473 }
4474 
4475 // A legal major_version.minor_version must be one of the following:
4476 //
4477 //  Major_version >= 45 and major_version < 56, any minor_version.
4478 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4479 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4480 //
4481 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4482   ResourceMark rm(THREAD);
4483   const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4484   if (major < JAVA_MIN_SUPPORTED_VERSION) {
4485     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4486                          class_name, major, minor, THREAD);
4487     return;
4488   }
4489 
4490   if (major > max_version) {
4491     Exceptions::fthrow(
4492       THREAD_AND_LOCATION,
4493       vmSymbols::java_lang_UnsupportedClassVersionError(),
4494       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4495       "this version of the Java Runtime only recognizes class file versions up to %u.0",
4496       class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4497     return;
4498   }
4499 
4500   if (major < JAVA_12_VERSION || minor == 0) {
4501     return;
4502   }
4503 
4504   if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4505     if (major != max_version) {
4506       Exceptions::fthrow(
4507         THREAD_AND_LOCATION,
4508         vmSymbols::java_lang_UnsupportedClassVersionError(),
4509         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4510         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4511         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4512       return;
4513     }
4514 
4515     if (!Arguments::enable_preview()) {
4516       classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4517                            class_name, major, minor, THREAD);
4518       return;
4519     }
4520 
4521   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4522     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4523                          class_name, major, minor, THREAD);
4524   }
4525 }
4526 
4527 void ClassFileParser::verify_legal_field_modifiers(jint flags,
4528                                                    bool is_interface,
4529                                                    TRAPS) const {
4530   if (!_need_verify) { return; }
4531 
4532   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4533   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4534   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4535   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4536   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4537   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4538   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4539   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4540   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4541 
4542   bool is_illegal = false;
4543 
4544   if (is_interface) {
4545     if (!is_public || !is_static || !is_final || is_private ||
4546         is_protected || is_volatile || is_transient ||
4547         (major_gte_1_5 && is_enum)) {
4548       is_illegal = true;
4549     }
4550   } else { // not interface
4551     if (has_illegal_visibility(flags) || (is_final && is_volatile)) {
4552       is_illegal = true;
4553     }
4554   }
4555 
4556   if (is_illegal) {
4557     ResourceMark rm(THREAD);
4558     Exceptions::fthrow(
4559       THREAD_AND_LOCATION,
4560       vmSymbols::java_lang_ClassFormatError(),
4561       "Illegal field modifiers in class %s: 0x%X",
4562       _class_name->as_C_string(), flags);
4563     return;
4564   }
4565 }
4566 
4567 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4568                                                     bool is_interface,
4569                                                     const Symbol* name,
4570                                                     TRAPS) const {
4571   if (!_need_verify) { return; }
4572 
4573   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4574   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4575   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4576   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4577   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4578   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4579   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4580   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4581   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4582   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4583   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
4584   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4585   const bool major_gte_17    = _major_version >= JAVA_17_VERSION;
4586   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4587 
4588   bool is_illegal = false;
4589 
4590   if (is_interface) {
4591     if (major_gte_8) {
4592       // Class file version is JAVA_8_VERSION or later Methods of
4593       // interfaces may set any of the flags except ACC_PROTECTED,
4594       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4595       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4596       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4597           (is_native || is_protected || is_final || is_synchronized) ||
4598           // If a specific method of a class or interface has its
4599           // ACC_ABSTRACT flag set, it must not have any of its
4600           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4601           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4602           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4603           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4604           (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4605         is_illegal = true;
4606       }
4607     } else if (major_gte_1_5) {
4608       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4609       if (!is_public || is_private || is_protected || is_static || is_final ||
4610           is_synchronized || is_native || !is_abstract || is_strict) {
4611         is_illegal = true;
4612       }
4613     } else {
4614       // Class file version is pre-JAVA_1_5_VERSION
4615       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4616         is_illegal = true;
4617       }
4618     }
4619   } else { // not interface
4620     if (has_illegal_visibility(flags)) {
4621       is_illegal = true;
4622     } else {
4623       if (is_initializer) {
4624         if (is_static || is_final || is_synchronized || is_native ||
4625             is_abstract || (major_gte_1_5 && is_bridge)) {
4626           is_illegal = true;
4627         }
4628       } else { // not initializer
4629         if (is_abstract) {
4630           if ((is_final || is_native || is_private || is_static ||
4631               (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4632             is_illegal = true;
4633           }
4634         }
4635       }
4636     }
4637   }
4638 
4639   if (is_illegal) {
4640     ResourceMark rm(THREAD);
4641     Exceptions::fthrow(
4642       THREAD_AND_LOCATION,
4643       vmSymbols::java_lang_ClassFormatError(),
4644       "Method %s in class %s has illegal modifiers: 0x%X",
4645       name->as_C_string(), _class_name->as_C_string(), flags);
4646     return;
4647   }
4648 }
4649 
4650 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4651                                         int length,
4652                                         TRAPS) const {
4653   assert(_need_verify, "only called when _need_verify is true");
4654   if (!UTF8::is_legal_utf8(buffer, length, _major_version <= 47)) {
4655     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4656   }
4657 }
4658 
4659 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4660 // In class names, '/' separates unqualified names.  This is verified in this function also.
4661 // Method names also may not contain the characters '<' or '>', unless <init>
4662 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4663 // method.  Because these names have been checked as special cases before
4664 // calling this method in verify_legal_method_name.
4665 //
4666 // This method is also called from the modular system APIs in modules.cpp
4667 // to verify the validity of module and package names.
4668 bool ClassFileParser::verify_unqualified_name(const char* name,
4669                                               unsigned int length,
4670                                               int type) {
4671   if (length == 0) return false;  // Must have at least one char.
4672   for (const char* p = name; p != name + length; p++) {
4673     switch(*p) {
4674       case JVM_SIGNATURE_DOT:
4675       case JVM_SIGNATURE_ENDCLASS:
4676       case JVM_SIGNATURE_ARRAY:
4677         // do not permit '.', ';', or '['
4678         return false;
4679       case JVM_SIGNATURE_SLASH:
4680         // check for '//' or leading or trailing '/' which are not legal
4681         // unqualified name must not be empty
4682         if (type == ClassFileParser::LegalClass) {
4683           if (p == name || p+1 >= name+length ||
4684               *(p+1) == JVM_SIGNATURE_SLASH) {
4685             return false;
4686           }
4687         } else {
4688           return false;   // do not permit '/' unless it's class name
4689         }
4690         break;
4691       case JVM_SIGNATURE_SPECIAL:
4692       case JVM_SIGNATURE_ENDSPECIAL:
4693         // do not permit '<' or '>' in method names
4694         if (type == ClassFileParser::LegalMethod) {
4695           return false;
4696         }
4697     }
4698   }
4699   return true;
4700 }
4701 
4702 // Take pointer to a UTF8 byte string (not NUL-terminated).
4703 // Skip over the longest part of the string that could
4704 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4705 // Return a pointer to just past the fieldname.
4706 // Return null if no fieldname at all was found, or in the case of slash_ok
4707 // being true, we saw consecutive slashes (meaning we were looking for a
4708 // qualified path but found something that was badly-formed).
4709 static const char* skip_over_field_name(const char* const name,
4710                                         bool slash_ok,
4711                                         unsigned int length) {
4712   const char* p;
4713   jboolean last_is_slash = false;
4714   jboolean not_first_ch = false;
4715 
4716   for (p = name; p != name + length; not_first_ch = true) {
4717     const char* old_p = p;
4718     jchar ch = *p;
4719     if (ch < 128) {
4720       p++;
4721       // quick check for ascii
4722       if ((ch >= 'a' && ch <= 'z') ||
4723         (ch >= 'A' && ch <= 'Z') ||
4724         (ch == '_' || ch == '$') ||
4725         (not_first_ch && ch >= '0' && ch <= '9')) {
4726         last_is_slash = false;
4727         continue;
4728       }
4729       if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4730         if (last_is_slash) {
4731           return nullptr;  // Don't permit consecutive slashes
4732         }
4733         last_is_slash = true;
4734         continue;
4735       }
4736     }
4737     else {
4738       jint unicode_ch;
4739       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4740       p = tmp_p;
4741       last_is_slash = false;
4742       // Check if ch is Java identifier start or is Java identifier part
4743       // 4672820: call java.lang.Character methods directly without generating separate tables.
4744       EXCEPTION_MARK;
4745       // return value
4746       JavaValue result(T_BOOLEAN);
4747       // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4748       JavaCallArguments args;
4749       args.push_int(unicode_ch);
4750 
4751       if (not_first_ch) {
4752         // public static boolean isJavaIdentifierPart(char ch);
4753         JavaCalls::call_static(&result,
4754           vmClasses::Character_klass(),
4755           vmSymbols::isJavaIdentifierPart_name(),
4756           vmSymbols::int_bool_signature(),
4757           &args,
4758           THREAD);
4759       } else {
4760         // public static boolean isJavaIdentifierStart(char ch);
4761         JavaCalls::call_static(&result,
4762           vmClasses::Character_klass(),
4763           vmSymbols::isJavaIdentifierStart_name(),
4764           vmSymbols::int_bool_signature(),
4765           &args,
4766           THREAD);
4767       }
4768       if (HAS_PENDING_EXCEPTION) {
4769         CLEAR_PENDING_EXCEPTION;
4770         return nullptr;
4771       }
4772       if(result.get_jboolean()) {
4773         continue;
4774       }
4775     }
4776     return (not_first_ch) ? old_p : nullptr;
4777   }
4778   return (not_first_ch && !last_is_slash) ? p : nullptr;
4779 }
4780 
4781 // Take pointer to a UTF8 byte string (not NUL-terminated).
4782 // Skip over the longest part of the string that could
4783 // be taken as a field signature. Allow "void" if void_ok.
4784 // Return a pointer to just past the signature.
4785 // Return null if no legal signature is found.
4786 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4787                                                        bool void_ok,
4788                                                        unsigned int length,
4789                                                        TRAPS) const {
4790   unsigned int array_dim = 0;
4791   while (length > 0) {
4792     switch (signature[0]) {
4793     case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4794     case JVM_SIGNATURE_BOOLEAN:
4795     case JVM_SIGNATURE_BYTE:
4796     case JVM_SIGNATURE_CHAR:
4797     case JVM_SIGNATURE_SHORT:
4798     case JVM_SIGNATURE_INT:
4799     case JVM_SIGNATURE_FLOAT:
4800     case JVM_SIGNATURE_LONG:
4801     case JVM_SIGNATURE_DOUBLE:
4802       return signature + 1;
4803     case JVM_SIGNATURE_CLASS: {
4804       if (_major_version < JAVA_1_5_VERSION) {
4805         // Skip over the class name if one is there
4806         const char* const p = skip_over_field_name(signature + 1, true, --length);
4807 
4808         // The next character better be a semicolon
4809         if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4810           return p + 1;
4811         }
4812       }
4813       else {
4814         // Skip leading 'L' and ignore first appearance of ';'
4815         signature++;
4816         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4817         // Format check signature
4818         if (c != nullptr) {
4819           int newlen = pointer_delta_as_int(c, (char*) signature);
4820           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4821           if (!legal) {
4822             classfile_parse_error("Class name is empty or contains illegal character "
4823                                   "in descriptor in class file %s",
4824                                   THREAD);
4825             return nullptr;
4826           }
4827           return signature + newlen + 1;
4828         }
4829       }
4830       return nullptr;
4831     }
4832     case JVM_SIGNATURE_ARRAY:
4833       array_dim++;
4834       if (array_dim > 255) {
4835         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4836         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4837         return nullptr;
4838       }
4839       // The rest of what's there better be a legal signature
4840       signature++;
4841       length--;
4842       void_ok = false;
4843       break;
4844     default:
4845       return nullptr;
4846     }
4847   }
4848   return nullptr;
4849 }
4850 
4851 // Checks if name is a legal class name.
4852 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4853   if (!_need_verify || _relax_verify) { return; }
4854 
4855   assert(name->refcount() > 0, "symbol must be kept alive");
4856   char* bytes = (char*)name->bytes();
4857   unsigned int length = name->utf8_length();
4858   bool legal = false;
4859 
4860   if (length > 0) {
4861     const char* p;
4862     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4863       p = skip_over_field_signature(bytes, false, length, CHECK);
4864       legal = (p != nullptr) && ((p - bytes) == (int)length);
4865     } else if (_major_version < JAVA_1_5_VERSION) {
4866       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4867         p = skip_over_field_name(bytes, true, length);
4868         legal = (p != nullptr) && ((p - bytes) == (int)length);
4869       }
4870     } else {
4871       // 4900761: relax the constraints based on JSR202 spec
4872       // Class names may be drawn from the entire Unicode character set.
4873       // Identifiers between '/' must be unqualified names.
4874       // The utf8 string has been verified when parsing cpool entries.
4875       legal = verify_unqualified_name(bytes, length, LegalClass);
4876     }
4877   }
4878   if (!legal) {
4879     ResourceMark rm(THREAD);
4880     assert(_class_name != nullptr, "invariant");
4881     Exceptions::fthrow(
4882       THREAD_AND_LOCATION,
4883       vmSymbols::java_lang_ClassFormatError(),
4884       "Illegal class name \"%.*s\" in class file %s", length, bytes,
4885       _class_name->as_C_string()
4886     );
4887     return;
4888   }
4889 }
4890 
4891 // Checks if name is a legal field name.
4892 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4893   if (!_need_verify || _relax_verify) { return; }
4894 
4895   char* bytes = (char*)name->bytes();
4896   unsigned int length = name->utf8_length();
4897   bool legal = false;
4898 
4899   if (length > 0) {
4900     if (_major_version < JAVA_1_5_VERSION) {
4901       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4902         const char* p = skip_over_field_name(bytes, false, length);
4903         legal = (p != nullptr) && ((p - bytes) == (int)length);
4904       }
4905     } else {
4906       // 4881221: relax the constraints based on JSR202 spec
4907       legal = verify_unqualified_name(bytes, length, LegalField);
4908     }
4909   }
4910 
4911   if (!legal) {
4912     ResourceMark rm(THREAD);
4913     assert(_class_name != nullptr, "invariant");
4914     Exceptions::fthrow(
4915       THREAD_AND_LOCATION,
4916       vmSymbols::java_lang_ClassFormatError(),
4917       "Illegal field name \"%.*s\" in class %s", length, bytes,
4918       _class_name->as_C_string()
4919     );
4920     return;
4921   }
4922 }
4923 
4924 // Checks if name is a legal method name.
4925 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
4926   if (!_need_verify || _relax_verify) { return; }
4927 
4928   assert(name != nullptr, "method name is null");
4929   char* bytes = (char*)name->bytes();
4930   unsigned int length = name->utf8_length();
4931   bool legal = false;
4932 
4933   if (length > 0) {
4934     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
4935       if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) {
4936         legal = true;
4937       }
4938     } else if (_major_version < JAVA_1_5_VERSION) {
4939       const char* p;
4940       p = skip_over_field_name(bytes, false, length);
4941       legal = (p != nullptr) && ((p - bytes) == (int)length);
4942     } else {
4943       // 4881221: relax the constraints based on JSR202 spec
4944       legal = verify_unqualified_name(bytes, length, LegalMethod);
4945     }
4946   }
4947 
4948   if (!legal) {
4949     ResourceMark rm(THREAD);
4950     assert(_class_name != nullptr, "invariant");
4951     Exceptions::fthrow(
4952       THREAD_AND_LOCATION,
4953       vmSymbols::java_lang_ClassFormatError(),
4954       "Illegal method name \"%.*s\" in class %s", length, bytes,
4955       _class_name->as_C_string()
4956     );
4957     return;
4958   }
4959 }
4960 
4961 
4962 // Checks if signature is a legal field signature.
4963 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
4964                                                    const Symbol* signature,
4965                                                    TRAPS) const {
4966   if (!_need_verify) { return; }
4967 
4968   const char* const bytes = (const char*)signature->bytes();
4969   const unsigned int length = signature->utf8_length();
4970   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
4971 
4972   if (p == nullptr || (p - bytes) != (int)length) {
4973     throwIllegalSignature("Field", name, signature, CHECK);
4974   }
4975 }
4976 
4977 // Check that the signature is compatible with the method name.  For example,
4978 // check that <init> has a void signature.
4979 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
4980                                                        const Symbol* signature,
4981                                                        TRAPS) const {
4982   if (!_need_verify) {
4983     return;
4984   }
4985 
4986   // Class initializers cannot have args for class format version >= 51.
4987   if (name == vmSymbols::class_initializer_name() &&
4988       signature != vmSymbols::void_method_signature() &&
4989       _major_version >= JAVA_7_VERSION) {
4990     throwIllegalSignature("Method", name, signature, THREAD);
4991     return;
4992   }
4993 
4994   int sig_length = signature->utf8_length();
4995   if (name->utf8_length() > 0 &&
4996       name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
4997       sig_length > 0 &&
4998       signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
4999     throwIllegalSignature("Method", name, signature, THREAD);
5000   }
5001 }
5002 
5003 // Checks if signature is a legal method signature.
5004 // Returns number of parameters
5005 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5006                                                    const Symbol* signature,
5007                                                    TRAPS) const {
5008   if (!_need_verify) {
5009     // make sure caller's args_size will be less than 0 even for non-static
5010     // method so it will be recomputed in compute_size_of_parameters().
5011     return -2;
5012   }
5013 
5014   unsigned int args_size = 0;
5015   const char* p = (const char*)signature->bytes();
5016   unsigned int length = signature->utf8_length();
5017   const char* nextp;
5018 
5019   // The first character must be a '('
5020   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5021     length--;
5022     // Skip over legal field signatures
5023     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5024     while ((length > 0) && (nextp != nullptr)) {
5025       args_size++;
5026       if (p[0] == 'J' || p[0] == 'D') {
5027         args_size++;
5028       }
5029       length -= pointer_delta_as_int(nextp, p);
5030       p = nextp;
5031       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5032     }
5033     // The first non-signature thing better be a ')'
5034     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5035       length--;
5036       // Now we better just have a return value
5037       nextp = skip_over_field_signature(p, true, length, CHECK_0);
5038       if (nextp && ((int)length == (nextp - p))) {
5039         return args_size;
5040       }
5041     }
5042   }
5043   // Report error
5044   throwIllegalSignature("Method", name, signature, THREAD);
5045   return 0;
5046 }
5047 
5048 int ClassFileParser::static_field_size() const {
5049   assert(_field_info != nullptr, "invariant");
5050   return _field_info->_static_field_size;
5051 }
5052 
5053 int ClassFileParser::total_oop_map_count() const {
5054   assert(_field_info != nullptr, "invariant");
5055   return _field_info->oop_map_blocks->_nonstatic_oop_map_count;
5056 }
5057 
5058 jint ClassFileParser::layout_size() const {
5059   assert(_field_info != nullptr, "invariant");
5060   return _field_info->_instance_size;
5061 }
5062 
5063 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5064                                          const Array<Method*>* methods) {
5065   assert(ik != nullptr, "invariant");
5066   assert(methods != nullptr, "invariant");
5067 
5068   // Set up Method*::intrinsic_id as soon as we know the names of methods.
5069   // (We used to do this lazily, but now we query it in Rewriter,
5070   // which is eagerly done for every method, so we might as well do it now,
5071   // when everything is fresh in memory.)
5072   const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5073 
5074   if (klass_id != vmSymbolID::NO_SID) {
5075     for (int j = 0; j < methods->length(); ++j) {
5076       Method* method = methods->at(j);
5077       method->init_intrinsic_id(klass_id);
5078 
5079       if (CheckIntrinsics) {
5080         // Check if an intrinsic is defined for method 'method',
5081         // but the method is not annotated with @IntrinsicCandidate.
5082         if (method->intrinsic_id() != vmIntrinsics::_none &&
5083             !method->intrinsic_candidate()) {
5084               tty->print("Compiler intrinsic is defined for method [%s], "
5085               "but the method is not annotated with @IntrinsicCandidate.%s",
5086               method->name_and_sig_as_C_string(),
5087               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5088             );
5089           tty->cr();
5090           DEBUG_ONLY(vm_exit(1));
5091         }
5092         // Check is the method 'method' is annotated with @IntrinsicCandidate,
5093         // but there is no intrinsic available for it.
5094         if (method->intrinsic_candidate() &&
5095           method->intrinsic_id() == vmIntrinsics::_none) {
5096             tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5097               "but no compiler intrinsic is defined for the method.%s",
5098               method->name_and_sig_as_C_string(),
5099               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5100             );
5101           tty->cr();
5102           DEBUG_ONLY(vm_exit(1));
5103         }
5104       }
5105     } // end for
5106 
5107 #ifdef ASSERT
5108     if (CheckIntrinsics) {
5109       // Check for orphan methods in the current class. A method m
5110       // of a class C is orphan if an intrinsic is defined for method m,
5111       // but class C does not declare m.
5112       // The check is potentially expensive, therefore it is available
5113       // only in debug builds.
5114 
5115       for (auto id : EnumRange<vmIntrinsicID>{}) {
5116         if (vmIntrinsics::_compiledLambdaForm == id) {
5117           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5118           // generated for the JVM from a LambdaForm and therefore no method
5119           // is defined for it.
5120           continue;
5121         }
5122         if (vmIntrinsics::_blackhole == id) {
5123           // The _blackhole intrinsic is a special marker. No explicit method
5124           // is defined for it.
5125           continue;
5126         }
5127 
5128         if (vmIntrinsics::class_for(id) == klass_id) {
5129           // Check if the current class contains a method with the same
5130           // name, flags, signature.
5131           bool match = false;
5132           for (int j = 0; j < methods->length(); ++j) {
5133             const Method* method = methods->at(j);
5134             if (method->intrinsic_id() == id) {
5135               match = true;
5136               break;
5137             }
5138           }
5139 
5140           if (!match) {
5141             char buf[1000];
5142             tty->print("Compiler intrinsic is defined for method [%s], "
5143                        "but the method is not available in class [%s].%s",
5144                         vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5145                         ik->name()->as_C_string(),
5146                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5147             );
5148             tty->cr();
5149             DEBUG_ONLY(vm_exit(1));
5150           }
5151         }
5152       } // end for
5153     } // CheckIntrinsics
5154 #endif // ASSERT
5155   }
5156 }
5157 
5158 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5159                                                       const ClassInstanceInfo& cl_inst_info,
5160                                                       TRAPS) {
5161   if (_klass != nullptr) {
5162     return _klass;
5163   }
5164 
5165   InstanceKlass* const ik =
5166     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5167 
5168   if (is_hidden()) {
5169     mangle_hidden_class_name(ik);
5170   }
5171 
5172   fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5173 
5174   assert(_klass == ik, "invariant");
5175 
5176   return ik;
5177 }
5178 
5179 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5180                                           bool changed_by_loadhook,
5181                                           const ClassInstanceInfo& cl_inst_info,
5182                                           TRAPS) {
5183   assert(ik != nullptr, "invariant");
5184 
5185   // Set name and CLD before adding to CLD
5186   ik->set_class_loader_data(_loader_data);
5187   ik->set_name(_class_name);
5188 
5189   // Add all classes to our internal class loader list here,
5190   // including classes in the bootstrap (null) class loader.
5191   const bool publicize = !is_internal();
5192 
5193   _loader_data->add_class(ik, publicize);
5194 
5195   set_klass_to_deallocate(ik);
5196 
5197   assert(_field_info != nullptr, "invariant");
5198   assert(ik->static_field_size() == _field_info->_static_field_size, "sanity");
5199   assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count,
5200          "sanity");
5201 
5202   assert(ik->is_instance_klass(), "sanity");
5203   assert(ik->size_helper() == _field_info->_instance_size, "sanity");
5204 
5205   // Fill in information already parsed
5206   ik->set_should_verify_class(_need_verify);
5207 
5208   // Not yet: supers are done below to support the new subtype-checking fields
5209   ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size);
5210   ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields);
5211   assert(_fac != nullptr, "invariant");
5212   ik->set_static_oop_field_count(_fac->count[STATIC_OOP]);
5213 
5214   // this transfers ownership of a lot of arrays from
5215   // the parser onto the InstanceKlass*
5216   apply_parsed_class_metadata(ik, _java_fields_count);
5217 
5218   // can only set dynamic nest-host after static nest information is set
5219   if (cl_inst_info.dynamic_nest_host() != nullptr) {
5220     ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5221   }
5222 
5223   // note that is not safe to use the fields in the parser from this point on
5224   assert(nullptr == _cp, "invariant");
5225   assert(nullptr == _fieldinfo_stream, "invariant");
5226   assert(nullptr == _fields_status, "invariant");
5227   assert(nullptr == _methods, "invariant");
5228   assert(nullptr == _inner_classes, "invariant");
5229   assert(nullptr == _nest_members, "invariant");
5230   assert(nullptr == _combined_annotations, "invariant");
5231   assert(nullptr == _record_components, "invariant");
5232   assert(nullptr == _permitted_subclasses, "invariant");
5233 
5234   if (_has_localvariable_table) {
5235     ik->set_has_localvariable_table(true);
5236   }
5237 
5238   if (_has_final_method) {
5239     ik->set_has_final_method();
5240   }
5241 
5242   ik->copy_method_ordering(_method_ordering, CHECK);
5243   // The InstanceKlass::_methods_jmethod_ids cache
5244   // is managed on the assumption that the initial cache
5245   // size is equal to the number of methods in the class. If
5246   // that changes, then InstanceKlass::idnum_can_increment()
5247   // has to be changed accordingly.
5248   ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5249 
5250   ik->set_this_class_index(_this_class_index);
5251 
5252   if (_is_hidden) {
5253     // _this_class_index is a CONSTANT_Class entry that refers to this
5254     // hidden class itself. If this class needs to refer to its own methods
5255     // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5256     // _this_class_index. However, because this class is hidden (it's
5257     // not stored in SystemDictionary), _this_class_index cannot be resolved
5258     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5259     // Therefore, we must eagerly resolve _this_class_index now.
5260     ik->constants()->klass_at_put(_this_class_index, ik);
5261   }
5262 
5263   ik->set_minor_version(_minor_version);
5264   ik->set_major_version(_major_version);
5265   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5266   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5267 
5268   if (_is_hidden) {
5269     ik->set_is_hidden();
5270   }
5271 
5272   // Set PackageEntry for this_klass
5273   oop cl = ik->class_loader();
5274   Handle clh = Handle(THREAD, java_lang_ClassLoader::non_reflection_class_loader(cl));
5275   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5276   ik->set_package(cld, nullptr, CHECK);
5277 
5278   const Array<Method*>* const methods = ik->methods();
5279   assert(methods != nullptr, "invariant");
5280   const int methods_len = methods->length();
5281 
5282   check_methods_for_intrinsics(ik, methods);
5283 
5284   // Fill in field values obtained by parse_classfile_attributes
5285   if (_parsed_annotations->has_any_annotations()) {
5286     _parsed_annotations->apply_to(ik);
5287   }
5288 
5289   apply_parsed_class_attributes(ik);
5290 
5291   // Miranda methods
5292   if ((_num_miranda_methods > 0) ||
5293       // if this class introduced new miranda methods or
5294       (_super_klass != nullptr && _super_klass->has_miranda_methods())
5295         // super class exists and this class inherited miranda methods
5296      ) {
5297        ik->set_has_miranda_methods(); // then set a flag
5298   }
5299 
5300   // Fill in information needed to compute superclasses.
5301   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5302   ik->set_transitive_interfaces(_transitive_interfaces);
5303   ik->set_local_interfaces(_local_interfaces);
5304   _transitive_interfaces = nullptr;
5305   _local_interfaces = nullptr;
5306 
5307   // Initialize itable offset tables
5308   klassItable::setup_itable_offset_table(ik);
5309 
5310   // Compute transitive closure of interfaces this class implements
5311   // Do final class setup
5312   OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks;
5313   if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5314     oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5315   }
5316 
5317   if (_has_contended_fields || _parsed_annotations->is_contended() ||
5318       ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5319     ik->set_has_contended_annotations(true);
5320   }
5321 
5322   // Fill in has_finalizer, has_vanilla_constructor, and layout_helper
5323   set_precomputed_flags(ik);
5324 
5325   // check if this class can access its super class
5326   check_super_class_access(ik, CHECK);
5327 
5328   // check if this class can access its superinterfaces
5329   check_super_interface_access(ik, CHECK);
5330 
5331   // check if this class overrides any final method
5332   check_final_method_override(ik, CHECK);
5333 
5334   // reject static interface methods prior to Java 8
5335   if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5336     check_illegal_static_method(ik, CHECK);
5337   }
5338 
5339   // Obtain this_klass' module entry
5340   ModuleEntry* module_entry = ik->module();
5341   assert(module_entry != nullptr, "module_entry should always be set");
5342 
5343   // Obtain java.lang.Module
5344   Handle module_handle(THREAD, module_entry->module());
5345 
5346   // Allocate mirror and initialize static fields
5347   // The create_mirror() call will also call compute_modifiers()
5348   java_lang_Class::create_mirror(ik,
5349                                  Handle(THREAD, _loader_data->class_loader()),
5350                                  module_handle,
5351                                  _protection_domain,
5352                                  cl_inst_info.class_data(),
5353                                  CHECK);
5354 
5355   assert(_all_mirandas != nullptr, "invariant");
5356 
5357   // Generate any default methods - default methods are public interface methods
5358   // that have a default implementation.  This is new with Java 8.
5359   if (_has_nonstatic_concrete_methods) {
5360     DefaultMethods::generate_default_methods(ik,
5361                                              _all_mirandas,
5362                                              CHECK);
5363   }
5364 
5365   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5366   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5367       !module_entry->has_default_read_edges()) {
5368     if (!module_entry->set_has_default_read_edges()) {
5369       // We won a potential race
5370       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5371     }
5372   }
5373 
5374   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5375 
5376   if (!is_internal()) {
5377     ik->print_class_load_logging(_loader_data, module_entry, _stream);
5378 
5379     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5380         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5381         log_is_enabled(Info, class, preview)) {
5382       ResourceMark rm;
5383       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5384                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5385     }
5386 
5387     if (log_is_enabled(Debug, class, resolve))  {
5388       ResourceMark rm;
5389       // print out the superclass.
5390       const char * from = ik->external_name();
5391       if (ik->java_super() != nullptr) {
5392         log_debug(class, resolve)("%s %s (super)",
5393                    from,
5394                    ik->java_super()->external_name());
5395       }
5396       // print out each of the interface classes referred to by this class.
5397       const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5398       if (local_interfaces != nullptr) {
5399         const int length = local_interfaces->length();
5400         for (int i = 0; i < length; i++) {
5401           const InstanceKlass* const k = local_interfaces->at(i);
5402           const char * to = k->external_name();
5403           log_debug(class, resolve)("%s %s (interface)", from, to);
5404         }
5405       }
5406     }
5407   }
5408 
5409   JFR_ONLY(INIT_ID(ik);)
5410 
5411   // If we reach here, all is well.
5412   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5413   // in order for it to not be destroyed in the ClassFileParser destructor.
5414   set_klass_to_deallocate(nullptr);
5415 
5416   // it's official
5417   set_klass(ik);
5418 
5419   debug_only(ik->verify();)
5420 }
5421 
5422 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5423   // Decrement the refcount in the old name, since we're clobbering it.
5424   _class_name->decrement_refcount();
5425 
5426   _class_name = new_class_name;
5427   // Increment the refcount of the new name.
5428   // Now the ClassFileParser owns this name and will decrement in
5429   // the destructor.
5430   _class_name->increment_refcount();
5431 }
5432 
5433 static bool relax_format_check_for(ClassLoaderData* loader_data) {
5434   bool trusted = loader_data->is_boot_class_loader_data() ||
5435                  loader_data->is_platform_class_loader_data();
5436   bool need_verify =
5437     // verifyAll
5438     (BytecodeVerificationLocal && BytecodeVerificationRemote) ||
5439     // verifyRemote
5440     (!BytecodeVerificationLocal && BytecodeVerificationRemote && !trusted);
5441   return !need_verify;
5442 }
5443 
5444 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5445                                  Symbol* name,
5446                                  ClassLoaderData* loader_data,
5447                                  const ClassLoadInfo* cl_info,
5448                                  Publicity pub_level,
5449                                  TRAPS) :
5450   _stream(stream),
5451   _class_name(nullptr),
5452   _loader_data(loader_data),
5453   _is_hidden(cl_info->is_hidden()),
5454   _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5455   _orig_cp_size(0),
5456   _super_klass(),
5457   _cp(nullptr),
5458   _fieldinfo_stream(nullptr),
5459   _fields_status(nullptr),
5460   _methods(nullptr),
5461   _inner_classes(nullptr),
5462   _nest_members(nullptr),
5463   _nest_host(0),
5464   _permitted_subclasses(nullptr),
5465   _record_components(nullptr),
5466   _local_interfaces(nullptr),
5467   _transitive_interfaces(nullptr),
5468   _combined_annotations(nullptr),
5469   _class_annotations(nullptr),
5470   _class_type_annotations(nullptr),
5471   _fields_annotations(nullptr),
5472   _fields_type_annotations(nullptr),
5473   _klass(nullptr),
5474   _klass_to_deallocate(nullptr),
5475   _parsed_annotations(nullptr),
5476   _fac(nullptr),
5477   _field_info(nullptr),
5478   _temp_field_info(nullptr),
5479   _method_ordering(nullptr),
5480   _all_mirandas(nullptr),
5481   _vtable_size(0),
5482   _itable_size(0),
5483   _num_miranda_methods(0),
5484   _protection_domain(cl_info->protection_domain()),
5485   _access_flags(),
5486   _pub_level(pub_level),
5487   _bad_constant_seen(0),
5488   _synthetic_flag(false),
5489   _sde_length(false),
5490   _sde_buffer(nullptr),
5491   _sourcefile_index(0),
5492   _generic_signature_index(0),
5493   _major_version(0),
5494   _minor_version(0),
5495   _this_class_index(0),
5496   _super_class_index(0),
5497   _itfs_len(0),
5498   _java_fields_count(0),
5499   _need_verify(false),
5500   _relax_verify(false),
5501   _has_nonstatic_concrete_methods(false),
5502   _declares_nonstatic_concrete_methods(false),
5503   _has_localvariable_table(false),
5504   _has_final_method(false),
5505   _has_contended_fields(false),
5506   _has_finalizer(false),
5507   _has_empty_finalizer(false),
5508   _has_vanilla_constructor(false),
5509   _max_bootstrap_specifier_index(-1) {
5510 
5511   _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5512   _class_name->increment_refcount();
5513 
5514   assert(_loader_data != nullptr, "invariant");
5515   assert(stream != nullptr, "invariant");
5516   assert(_stream != nullptr, "invariant");
5517   assert(_stream->buffer() == _stream->current(), "invariant");
5518   assert(_class_name != nullptr, "invariant");
5519   assert(0 == _access_flags.as_int(), "invariant");
5520 
5521   // Figure out whether we can skip format checking (matching classic VM behavior)
5522   if (CDSConfig::is_dumping_static_archive()) {
5523     // verify == true means it's a 'remote' class (i.e., non-boot class)
5524     // Verification decision is based on BytecodeVerificationRemote flag
5525     // for those classes.
5526     _need_verify = (stream->need_verify()) ? BytecodeVerificationRemote :
5527                                               BytecodeVerificationLocal;
5528   }
5529   else {
5530     _need_verify = Verifier::should_verify_for(_loader_data->class_loader(),
5531                                                stream->need_verify());
5532   }
5533 
5534   // synch back verification state to stream
5535   stream->set_verify(_need_verify);
5536 
5537   // Check if verification needs to be relaxed for this class file
5538   // Do not restrict it to jdk1.0 or jdk1.1 to maintain backward compatibility (4982376)
5539   _relax_verify = relax_format_check_for(_loader_data);
5540 
5541   parse_stream(stream, CHECK);
5542 
5543   post_process_parsed_stream(stream, _cp, CHECK);
5544 }
5545 
5546 void ClassFileParser::clear_class_metadata() {
5547   // metadata created before the instance klass is created.  Must be
5548   // deallocated if classfile parsing returns an error.
5549   _cp = nullptr;
5550   _fieldinfo_stream = nullptr;
5551   _fields_status = nullptr;
5552   _methods = nullptr;
5553   _inner_classes = nullptr;
5554   _nest_members = nullptr;
5555   _permitted_subclasses = nullptr;
5556   _combined_annotations = nullptr;
5557   _class_annotations = _class_type_annotations = nullptr;
5558   _fields_annotations = _fields_type_annotations = nullptr;
5559   _record_components = nullptr;
5560 }
5561 
5562 // Destructor to clean up
5563 ClassFileParser::~ClassFileParser() {
5564   _class_name->decrement_refcount();
5565 
5566   if (_cp != nullptr) {
5567     MetadataFactory::free_metadata(_loader_data, _cp);
5568   }
5569 
5570   if (_fieldinfo_stream != nullptr) {
5571     MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5572   }
5573 
5574   if (_fields_status != nullptr) {
5575     MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5576   }
5577 
5578   if (_methods != nullptr) {
5579     // Free methods
5580     InstanceKlass::deallocate_methods(_loader_data, _methods);
5581   }
5582 
5583   // beware of the Universe::empty_blah_array!!
5584   if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5585     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5586   }
5587 
5588   if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5589     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5590   }
5591 
5592   if (_record_components != nullptr) {
5593     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5594   }
5595 
5596   if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5597     MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5598   }
5599 
5600   // Free interfaces
5601   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5602                                        _local_interfaces, _transitive_interfaces);
5603 
5604   if (_combined_annotations != nullptr) {
5605     // After all annotations arrays have been created, they are installed into the
5606     // Annotations object that will be assigned to the InstanceKlass being created.
5607 
5608     // Deallocate the Annotations object and the installed annotations arrays.
5609     _combined_annotations->deallocate_contents(_loader_data);
5610 
5611     // If the _combined_annotations pointer is non-null,
5612     // then the other annotations fields should have been cleared.
5613     assert(_class_annotations       == nullptr, "Should have been cleared");
5614     assert(_class_type_annotations  == nullptr, "Should have been cleared");
5615     assert(_fields_annotations      == nullptr, "Should have been cleared");
5616     assert(_fields_type_annotations == nullptr, "Should have been cleared");
5617   } else {
5618     // If the annotations arrays were not installed into the Annotations object,
5619     // then they have to be deallocated explicitly.
5620     MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5621     MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5622     Annotations::free_contents(_loader_data, _fields_annotations);
5623     Annotations::free_contents(_loader_data, _fields_type_annotations);
5624   }
5625 
5626   clear_class_metadata();
5627   _transitive_interfaces = nullptr;
5628   _local_interfaces = nullptr;
5629 
5630   // deallocate the klass if already created.  Don't directly deallocate, but add
5631   // to the deallocate list so that the klass is removed from the CLD::_klasses list
5632   // at a safepoint.
5633   if (_klass_to_deallocate != nullptr) {
5634     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5635   }
5636 }
5637 
5638 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5639                                    TRAPS) {
5640 
5641   assert(stream != nullptr, "invariant");
5642   assert(_class_name != nullptr, "invariant");
5643 
5644   // BEGIN STREAM PARSING
5645   stream->guarantee_more(8, CHECK);  // magic, major, minor
5646   // Magic value
5647   const u4 magic = stream->get_u4_fast();
5648   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5649                      "Incompatible magic value %u in class file %s",
5650                      magic, CHECK);
5651 
5652   // Version numbers
5653   _minor_version = stream->get_u2_fast();
5654   _major_version = stream->get_u2_fast();
5655 
5656   // Check version numbers - we check this even with verifier off
5657   verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5658 
5659   stream->guarantee_more(3, CHECK); // length, first cp tag
5660   u2 cp_size = stream->get_u2_fast();
5661 
5662   guarantee_property(
5663     cp_size >= 1, "Illegal constant pool size %u in class file %s",
5664     cp_size, CHECK);
5665 
5666   _orig_cp_size = cp_size;
5667   if (is_hidden()) { // Add a slot for hidden class name.
5668     cp_size++;
5669   }
5670 
5671   _cp = ConstantPool::allocate(_loader_data,
5672                                cp_size,
5673                                CHECK);
5674 
5675   ConstantPool* const cp = _cp;
5676 
5677   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5678 
5679   assert(cp_size == (u2)cp->length(), "invariant");
5680 
5681   // ACCESS FLAGS
5682   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
5683 
5684   // Access flags
5685   jint flags;
5686   // JVM_ACC_MODULE is defined in JDK-9 and later.
5687   if (_major_version >= JAVA_9_VERSION) {
5688     flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5689   } else {
5690     flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5691   }
5692 
5693   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5694     // Set abstract bit for old class files for backward compatibility
5695     flags |= JVM_ACC_ABSTRACT;
5696   }
5697 
5698   verify_legal_class_modifiers(flags, CHECK);
5699 
5700   short bad_constant = class_bad_constant_seen();
5701   if (bad_constant != 0) {
5702     // Do not throw CFE until after the access_flags are checked because if
5703     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5704     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5705     return;
5706   }
5707 
5708   _access_flags.set_flags(flags);
5709 
5710   // This class and superclass
5711   _this_class_index = stream->get_u2_fast();
5712   check_property(
5713     valid_cp_range(_this_class_index, cp_size) &&
5714       cp->tag_at(_this_class_index).is_unresolved_klass(),
5715     "Invalid this class index %u in constant pool in class file %s",
5716     _this_class_index, CHECK);
5717 
5718   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5719   assert(class_name_in_cp != nullptr, "class_name can't be null");
5720 
5721   // Don't need to check whether this class name is legal or not.
5722   // It has been checked when constant pool is parsed.
5723   // However, make sure it is not an array type.
5724   if (_need_verify) {
5725     guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5726                        "Bad class name in class file %s",
5727                        CHECK);
5728   }
5729 
5730 #ifdef ASSERT
5731   // Basic sanity checks
5732   if (_is_hidden) {
5733     assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5734   }
5735 #endif
5736 
5737   // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5738 
5739   if (_is_hidden) {
5740     assert(_class_name != nullptr, "Unexpected null _class_name");
5741 #ifdef ASSERT
5742     if (_need_verify) {
5743       verify_legal_class_name(_class_name, CHECK);
5744     }
5745 #endif
5746 
5747   } else {
5748     // Check if name in class file matches given name
5749     if (_class_name != class_name_in_cp) {
5750       if (_class_name != vmSymbols::unknown_class_name()) {
5751         ResourceMark rm(THREAD);
5752         Exceptions::fthrow(THREAD_AND_LOCATION,
5753                            vmSymbols::java_lang_NoClassDefFoundError(),
5754                            "%s (wrong name: %s)",
5755                            _class_name->as_C_string(),
5756                            class_name_in_cp->as_C_string()
5757                            );
5758         return;
5759       } else {
5760         // The class name was not known by the caller so we set it from
5761         // the value in the CP.
5762         update_class_name(class_name_in_cp);
5763       }
5764       // else nothing to do: the expected class name matches what is in the CP
5765     }
5766   }
5767 
5768   // Verification prevents us from creating names with dots in them, this
5769   // asserts that that's the case.
5770   assert(is_internal_format(_class_name), "external class name format used internally");
5771 
5772   if (!is_internal()) {
5773     LogTarget(Debug, class, preorder) lt;
5774     if (lt.is_enabled()){
5775       ResourceMark rm(THREAD);
5776       LogStream ls(lt);
5777       ls.print("%s", _class_name->as_klass_external_name());
5778       if (stream->source() != nullptr) {
5779         ls.print(" source: %s", stream->source());
5780       }
5781       ls.cr();
5782     }
5783   }
5784 
5785   // SUPERKLASS
5786   _super_class_index = stream->get_u2_fast();
5787   _super_klass = parse_super_class(cp,
5788                                    _super_class_index,
5789                                    _need_verify,
5790                                    CHECK);
5791 
5792   // Interfaces
5793   _itfs_len = stream->get_u2_fast();
5794   parse_interfaces(stream,
5795                    _itfs_len,
5796                    cp,
5797                    &_has_nonstatic_concrete_methods,
5798                    CHECK);
5799 
5800   assert(_local_interfaces != nullptr, "invariant");
5801 
5802   // Fields (offsets are filled in later)
5803   _fac = new FieldAllocationCount();
5804   parse_fields(stream,
5805                _access_flags.is_interface(),
5806                _fac,
5807                cp,
5808                cp_size,
5809                &_java_fields_count,
5810                CHECK);
5811 
5812   assert(_temp_field_info != nullptr, "invariant");
5813 
5814   // Methods
5815   parse_methods(stream,
5816                 _access_flags.is_interface(),
5817                 &_has_localvariable_table,
5818                 &_has_final_method,
5819                 &_declares_nonstatic_concrete_methods,
5820                 CHECK);
5821 
5822   assert(_methods != nullptr, "invariant");
5823 
5824   if (_declares_nonstatic_concrete_methods) {
5825     _has_nonstatic_concrete_methods = true;
5826   }
5827 
5828   // Additional attributes/annotations
5829   _parsed_annotations = new ClassAnnotationCollector();
5830   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5831 
5832   assert(_inner_classes != nullptr, "invariant");
5833 
5834   // Finalize the Annotations metadata object,
5835   // now that all annotation arrays have been created.
5836   create_combined_annotations(CHECK);
5837 
5838   // Make sure this is the end of class file stream
5839   guarantee_property(stream->at_eos(),
5840                      "Extra bytes at the end of class file %s",
5841                      CHECK);
5842 
5843   // all bytes in stream read and parsed
5844 }
5845 
5846 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5847   ResourceMark rm;
5848   // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5849   // use a '/' because that confuses finding the class's package.  Also, can't
5850   // use an illegal char such as ';' because that causes serialization issues
5851   // and issues with hidden classes that create their own hidden classes.
5852   char addr_buf[20];
5853   if (CDSConfig::is_dumping_static_archive()) {
5854     // We want stable names for the archived hidden classes (only for static
5855     // archive for now). Spaces under default_SharedBaseAddress() will be
5856     // occupied by the archive at run time, so we know that no dynamically
5857     // loaded InstanceKlass will be placed under there.
5858     static volatile size_t counter = 0;
5859     Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5860     size_t new_id = Atomic::add(&counter, (size_t)1);
5861     jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id);
5862   } else {
5863     jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5864   }
5865   size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5866   char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5867   jio_snprintf(new_name, new_name_len, "%s+%s",
5868                _class_name->as_C_string(), addr_buf);
5869   update_class_name(SymbolTable::new_symbol(new_name));
5870 
5871   // Add a Utf8 entry containing the hidden name.
5872   assert(_class_name != nullptr, "Unexpected null _class_name");
5873   int hidden_index = _orig_cp_size; // this is an extra slot we added
5874   _cp->symbol_at_put(hidden_index, _class_name);
5875 
5876   // Update this_class_index's slot in the constant pool with the new Utf8 entry.
5877   // We have to update the resolved_klass_index and the name_index together
5878   // so extract the existing resolved_klass_index first.
5879   CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
5880   int resolved_klass_index = cp_klass_slot.resolved_klass_index();
5881   _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
5882   assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
5883          "Bad name_index");
5884 }
5885 
5886 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
5887                                                  ConstantPool* cp,
5888                                                  TRAPS) {
5889   assert(stream != nullptr, "invariant");
5890   assert(stream->at_eos(), "invariant");
5891   assert(cp != nullptr, "invariant");
5892   assert(_loader_data != nullptr, "invariant");
5893 
5894   if (_class_name == vmSymbols::java_lang_Object()) {
5895     check_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
5896                    "java.lang.Object cannot implement an interface in class file %s",
5897                    CHECK);
5898   }
5899   // We check super class after class file is parsed and format is checked
5900   if (_super_class_index > 0 && nullptr == _super_klass) {
5901     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
5902     if (_access_flags.is_interface()) {
5903       // Before attempting to resolve the superclass, check for class format
5904       // errors not checked yet.
5905       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
5906         "Interfaces must have java.lang.Object as superclass in class file %s",
5907         CHECK);
5908     }
5909     Handle loader(THREAD, _loader_data->class_loader());
5910     if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
5911       _super_klass = vmClasses::Object_klass();
5912     } else {
5913       _super_klass = (const InstanceKlass*)
5914                        SystemDictionary::resolve_super_or_fail(_class_name,
5915                                                                super_class_name,
5916                                                                loader,
5917                                                                _protection_domain,
5918                                                                true,
5919                                                                CHECK);
5920     }
5921   }
5922 
5923   if (_super_klass != nullptr) {
5924     if (_super_klass->has_nonstatic_concrete_methods()) {
5925       _has_nonstatic_concrete_methods = true;
5926     }
5927 
5928     if (_super_klass->is_interface()) {
5929       classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
5930       return;
5931     }
5932   }
5933 
5934   // Compute the transitive list of all unique interfaces implemented by this class
5935   _transitive_interfaces =
5936     compute_transitive_interfaces(_super_klass,
5937                                   _local_interfaces,
5938                                   _loader_data,
5939                                   CHECK);
5940 
5941   assert(_transitive_interfaces != nullptr, "invariant");
5942 
5943   // sort methods
5944   _method_ordering = sort_methods(_methods);
5945 
5946   _all_mirandas = new GrowableArray<Method*>(20);
5947 
5948   Handle loader(THREAD, _loader_data->class_loader());
5949   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
5950                                                     &_num_miranda_methods,
5951                                                     _all_mirandas,
5952                                                     _super_klass,
5953                                                     _methods,
5954                                                     _access_flags,
5955                                                     _major_version,
5956                                                     loader,
5957                                                     _class_name,
5958                                                     _local_interfaces);
5959 
5960   // Size of Java itable (in words)
5961   _itable_size = _access_flags.is_interface() ? 0 :
5962     klassItable::compute_itable_size(_transitive_interfaces);
5963 
5964   assert(_fac != nullptr, "invariant");
5965   assert(_parsed_annotations != nullptr, "invariant");
5966 
5967   _field_info = new FieldLayoutInfo();
5968   FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info,
5969                         _parsed_annotations->is_contended(), _field_info);
5970   lb.build_layout();
5971 
5972   int injected_fields_count = _temp_field_info->length() - _java_fields_count;
5973   _fieldinfo_stream =
5974     FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
5975                                             injected_fields_count, loader_data(), CHECK);
5976   _fields_status =
5977     MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
5978                                             FieldStatus(0), CHECK);
5979 }
5980 
5981 void ClassFileParser::set_klass(InstanceKlass* klass) {
5982 
5983 #ifdef ASSERT
5984   if (klass != nullptr) {
5985     assert(nullptr == _klass, "leaking?");
5986   }
5987 #endif
5988 
5989   _klass = klass;
5990 }
5991 
5992 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
5993 
5994 #ifdef ASSERT
5995   if (klass != nullptr) {
5996     assert(nullptr == _klass_to_deallocate, "leaking?");
5997   }
5998 #endif
5999 
6000   _klass_to_deallocate = klass;
6001 }
6002 
6003 // Caller responsible for ResourceMark
6004 // clone stream with rewound position
6005 const ClassFileStream* ClassFileParser::clone_stream() const {
6006   assert(_stream != nullptr, "invariant");
6007 
6008   return _stream->clone();
6009 }
6010 
6011 ReferenceType ClassFileParser::super_reference_type() const {
6012   return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6013 }
6014 
6015 bool ClassFileParser::is_instance_ref_klass() const {
6016   // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6017   // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6018   // klass requiring special treatment in ref-processing. The abstract
6019   // j.l.r.Reference cannot be instantiated so doesn't partake in
6020   // ref-processing.
6021   return is_java_lang_ref_Reference_subclass();
6022 }
6023 
6024 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6025   if (_super_klass == nullptr) {
6026     return false;
6027   }
6028 
6029   if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6030     // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6031     return true;
6032   }
6033 
6034   return _super_klass->reference_type() != REF_NONE;
6035 }
6036 
6037 // ----------------------------------------------------------------------------
6038 // debugging
6039 
6040 #ifdef ASSERT
6041 
6042 // return true if class_name contains no '.' (internal format is '/')
6043 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6044   if (class_name != nullptr) {
6045     ResourceMark rm;
6046     char* name = class_name->as_C_string();
6047     return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6048   } else {
6049     return true;
6050   }
6051 }
6052 
6053 #endif