1 /*
   2  * Copyright (c) 1997, 2025, 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 
  25 #include "oops/inlineKlass.hpp"
  26 #include "cds/cdsConfig.hpp"
  27 #include "classfile/classFileParser.hpp"
  28 #include "classfile/classFileStream.hpp"
  29 #include "classfile/classLoader.hpp"
  30 #include "classfile/classLoaderData.inline.hpp"
  31 #include "classfile/classLoadInfo.hpp"
  32 #include "classfile/defaultMethods.hpp"
  33 #include "classfile/fieldLayoutBuilder.hpp"
  34 #include "classfile/javaClasses.inline.hpp"
  35 #include "classfile/moduleEntry.hpp"
  36 #include "classfile/packageEntry.hpp"
  37 #include "classfile/symbolTable.hpp"
  38 #include "classfile/systemDictionary.hpp"
  39 #include "classfile/verificationType.hpp"
  40 #include "classfile/verifier.hpp"
  41 #include "classfile/vmClasses.hpp"
  42 #include "classfile/vmSymbols.hpp"
  43 #include "jvm.h"
  44 #include "logging/log.hpp"
  45 #include "logging/logStream.hpp"
  46 #include "memory/allocation.hpp"
  47 #include "memory/metadataFactory.hpp"
  48 #include "memory/oopFactory.hpp"
  49 #include "memory/resourceArea.hpp"
  50 #include "memory/universe.hpp"
  51 #include "oops/annotations.hpp"
  52 #include "oops/constantPool.inline.hpp"
  53 #include "oops/fieldInfo.hpp"
  54 #include "oops/fieldStreams.inline.hpp"
  55 #include "oops/inlineKlass.inline.hpp"
  56 #include "oops/instanceKlass.inline.hpp"
  57 #include "oops/instanceMirrorKlass.hpp"
  58 #include "oops/klass.inline.hpp"
  59 #include "oops/klassVtable.hpp"
  60 #include "oops/metadata.hpp"
  61 #include "oops/method.inline.hpp"
  62 #include "oops/oop.inline.hpp"
  63 #include "oops/recordComponent.hpp"
  64 #include "oops/symbol.hpp"
  65 #include "prims/jvmtiExport.hpp"
  66 #include "prims/jvmtiThreadState.hpp"
  67 #include "runtime/arguments.hpp"
  68 #include "runtime/fieldDescriptor.inline.hpp"
  69 #include "runtime/handles.inline.hpp"
  70 #include "runtime/javaCalls.hpp"
  71 #include "runtime/os.hpp"
  72 #include "runtime/perfData.hpp"
  73 #include "runtime/reflection.hpp"
  74 #include "runtime/safepointVerifiers.hpp"
  75 #include "runtime/signature.hpp"
  76 #include "runtime/timer.hpp"
  77 #include "services/classLoadingService.hpp"
  78 #include "services/threadService.hpp"
  79 #include "utilities/align.hpp"
  80 #include "utilities/bitMap.inline.hpp"
  81 #include "utilities/checkedCast.hpp"
  82 #include "utilities/copy.hpp"
  83 #include "utilities/formatBuffer.hpp"
  84 #include "utilities/exceptions.hpp"
  85 #include "utilities/globalDefinitions.hpp"
  86 #include "utilities/growableArray.hpp"
  87 #include "utilities/macros.hpp"
  88 #include "utilities/ostream.hpp"
  89 #include "utilities/resourceHash.hpp"
  90 #include "utilities/stringUtils.hpp"
  91 #include "utilities/utf8.hpp"
  92 #if INCLUDE_CDS
  93 #include "classfile/systemDictionaryShared.hpp"
  94 #endif
  95 #if INCLUDE_JFR
  96 #include "jfr/support/jfrTraceIdExtension.hpp"
  97 #endif
  98 
  99 // We generally try to create the oops directly when parsing, rather than
 100 // allocating temporary data structures and copying the bytes twice. A
 101 // temporary area is only needed when parsing utf8 entries in the constant
 102 // pool and when parsing line number tables.
 103 
 104 // We add assert in debug mode when class format is not checked.
 105 
 106 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
 107 #define JAVA_MIN_SUPPORTED_VERSION        45
 108 #define JAVA_PREVIEW_MINOR_VERSION        65535
 109 
 110 // Used for two backward compatibility reasons:
 111 // - to check for new additions to the class file format in JDK1.5
 112 // - to check for bug fixes in the format checker in JDK1.5
 113 #define JAVA_1_5_VERSION                  49
 114 
 115 // Used for backward compatibility reasons:
 116 // - to check for javac bug fixes that happened after 1.5
 117 // - also used as the max version when running in jdk6
 118 #define JAVA_6_VERSION                    50
 119 
 120 // Used for backward compatibility reasons:
 121 // - to disallow argument and require ACC_STATIC for <clinit> methods
 122 #define JAVA_7_VERSION                    51
 123 
 124 // Extension method support.
 125 #define JAVA_8_VERSION                    52
 126 
 127 #define JAVA_9_VERSION                    53
 128 
 129 #define JAVA_10_VERSION                   54
 130 
 131 #define JAVA_11_VERSION                   55
 132 
 133 #define JAVA_12_VERSION                   56
 134 
 135 #define JAVA_13_VERSION                   57
 136 
 137 #define JAVA_14_VERSION                   58
 138 
 139 #define JAVA_15_VERSION                   59
 140 
 141 #define JAVA_16_VERSION                   60
 142 
 143 #define JAVA_17_VERSION                   61
 144 
 145 #define JAVA_18_VERSION                   62
 146 
 147 #define JAVA_19_VERSION                   63
 148 
 149 #define JAVA_20_VERSION                   64
 150 
 151 #define JAVA_21_VERSION                   65
 152 
 153 #define JAVA_22_VERSION                   66
 154 
 155 #define JAVA_23_VERSION                   67
 156 
 157 #define CONSTANT_CLASS_DESCRIPTORS        69
 158 
 159 #define JAVA_24_VERSION                   68
 160 
 161 #define JAVA_25_VERSION                   69
 162 
 163 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
 164   assert((bad_constant == JVM_CONSTANT_Module ||
 165           bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
 166          "Unexpected bad constant pool entry");
 167   if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
 168 }
 169 
 170 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 171                                                   ConstantPool* cp,
 172                                                   const int length,
 173                                                   TRAPS) {
 174   assert(stream != nullptr, "invariant");
 175   assert(cp != nullptr, "invariant");
 176 
 177   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 178   // this function (_current can be allocated in a register, with scalar
 179   // replacement of aggregates). The _current pointer is copied back to
 180   // stream() when this function returns. DON'T call another method within
 181   // this method that uses stream().
 182   const ClassFileStream cfs1 = *stream;
 183   const ClassFileStream* const cfs = &cfs1;
 184 
 185   debug_only(const u1* const old_current = stream->current();)
 186 
 187   // Used for batching symbol allocations.
 188   const char* names[SymbolTable::symbol_alloc_batch_size];
 189   int lengths[SymbolTable::symbol_alloc_batch_size];
 190   int indices[SymbolTable::symbol_alloc_batch_size];
 191   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 192   int names_count = 0;
 193 
 194   // parsing  Index 0 is unused
 195   for (int index = 1; index < length; index++) {
 196     // Each of the following case guarantees one more byte in the stream
 197     // for the following tag or the access_flags following constant pool,
 198     // so we don't need bounds-check for reading tag.
 199     const u1 tag = cfs->get_u1_fast();
 200     switch (tag) {
 201       case JVM_CONSTANT_Class: {
 202         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 203         const u2 name_index = cfs->get_u2_fast();
 204         cp->klass_index_at_put(index, name_index);
 205         break;
 206       }
 207       case JVM_CONSTANT_Fieldref: {
 208         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 209         const u2 class_index = cfs->get_u2_fast();
 210         const u2 name_and_type_index = cfs->get_u2_fast();
 211         cp->field_at_put(index, class_index, name_and_type_index);
 212         break;
 213       }
 214       case JVM_CONSTANT_Methodref: {
 215         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 216         const u2 class_index = cfs->get_u2_fast();
 217         const u2 name_and_type_index = cfs->get_u2_fast();
 218         cp->method_at_put(index, class_index, name_and_type_index);
 219         break;
 220       }
 221       case JVM_CONSTANT_InterfaceMethodref: {
 222         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 223         const u2 class_index = cfs->get_u2_fast();
 224         const u2 name_and_type_index = cfs->get_u2_fast();
 225         cp->interface_method_at_put(index, class_index, name_and_type_index);
 226         break;
 227       }
 228       case JVM_CONSTANT_String : {
 229         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 230         const u2 string_index = cfs->get_u2_fast();
 231         cp->string_index_at_put(index, string_index);
 232         break;
 233       }
 234       case JVM_CONSTANT_MethodHandle :
 235       case JVM_CONSTANT_MethodType: {
 236         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 237           classfile_parse_error(
 238             "Class file version does not support constant tag %u in class file %s",
 239             tag, THREAD);
 240           return;
 241         }
 242         if (tag == JVM_CONSTANT_MethodHandle) {
 243           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 244           const u1 ref_kind = cfs->get_u1_fast();
 245           const u2 method_index = cfs->get_u2_fast();
 246           cp->method_handle_index_at_put(index, ref_kind, method_index);
 247         }
 248         else if (tag == JVM_CONSTANT_MethodType) {
 249           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 250           const u2 signature_index = cfs->get_u2_fast();
 251           cp->method_type_index_at_put(index, signature_index);
 252         }
 253         else {
 254           ShouldNotReachHere();
 255         }
 256         break;
 257       }
 258       case JVM_CONSTANT_Dynamic : {
 259         if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
 260           classfile_parse_error(
 261               "Class file version does not support constant tag %u in class file %s",
 262               tag, THREAD);
 263           return;
 264         }
 265         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 266         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 267         const u2 name_and_type_index = cfs->get_u2_fast();
 268         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 269           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 270         }
 271         cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
 272         break;
 273       }
 274       case JVM_CONSTANT_InvokeDynamic : {
 275         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 276           classfile_parse_error(
 277               "Class file version does not support constant tag %u in class file %s",
 278               tag, THREAD);
 279           return;
 280         }
 281         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 282         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 283         const u2 name_and_type_index = cfs->get_u2_fast();
 284         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 285           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 286         }
 287         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 288         break;
 289       }
 290       case JVM_CONSTANT_Integer: {
 291         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 292         const u4 bytes = cfs->get_u4_fast();
 293         cp->int_at_put(index, (jint)bytes);
 294         break;
 295       }
 296       case JVM_CONSTANT_Float: {
 297         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 298         const u4 bytes = cfs->get_u4_fast();
 299         cp->float_at_put(index, *(jfloat*)&bytes);
 300         break;
 301       }
 302       case JVM_CONSTANT_Long: {
 303         // A mangled type might cause you to overrun allocated memory
 304         guarantee_property(index + 1 < length,
 305                            "Invalid constant pool entry %u in class file %s",
 306                            index,
 307                            CHECK);
 308         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 309         const u8 bytes = cfs->get_u8_fast();
 310         cp->long_at_put(index, bytes);
 311         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 312         break;
 313       }
 314       case JVM_CONSTANT_Double: {
 315         // A mangled type might cause you to overrun allocated memory
 316         guarantee_property(index+1 < length,
 317                            "Invalid constant pool entry %u in class file %s",
 318                            index,
 319                            CHECK);
 320         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 321         const u8 bytes = cfs->get_u8_fast();
 322         cp->double_at_put(index, *(jdouble*)&bytes);
 323         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 324         break;
 325       }
 326       case JVM_CONSTANT_NameAndType: {
 327         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 328         const u2 name_index = cfs->get_u2_fast();
 329         const u2 signature_index = cfs->get_u2_fast();
 330         cp->name_and_type_at_put(index, name_index, signature_index);
 331         break;
 332       }
 333       case JVM_CONSTANT_Utf8 : {
 334         cfs->guarantee_more(2, CHECK);  // utf8_length
 335         u2  utf8_length = cfs->get_u2_fast();
 336         const u1* utf8_buffer = cfs->current();
 337         assert(utf8_buffer != nullptr, "null utf8 buffer");
 338         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 339         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 340         cfs->skip_u1_fast(utf8_length);
 341 
 342         // Before storing the symbol, make sure it's legal
 343         if (_need_verify) {
 344           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 345         }
 346 
 347         unsigned int hash;
 348         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 349                                                         utf8_length,
 350                                                         hash);
 351         if (result == nullptr) {
 352           names[names_count] = (const char*)utf8_buffer;
 353           lengths[names_count] = utf8_length;
 354           indices[names_count] = index;
 355           hashValues[names_count++] = hash;
 356           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 357             SymbolTable::new_symbols(_loader_data,
 358                                      constantPoolHandle(THREAD, cp),
 359                                      names_count,
 360                                      names,
 361                                      lengths,
 362                                      indices,
 363                                      hashValues);
 364             names_count = 0;
 365           }
 366         } else {
 367           cp->symbol_at_put(index, result);
 368         }
 369         break;
 370       }
 371       case JVM_CONSTANT_Module:
 372       case JVM_CONSTANT_Package: {
 373         // Record that an error occurred in these two cases but keep parsing so
 374         // that ACC_Module can be checked for in the access_flags.  Need to
 375         // throw NoClassDefFoundError in that case.
 376         if (_major_version >= JAVA_9_VERSION) {
 377           cfs->guarantee_more(3, CHECK);
 378           cfs->get_u2_fast();
 379           set_class_bad_constant_seen(tag);
 380           break;
 381         }
 382       }
 383       default: {
 384         classfile_parse_error("Unknown constant tag %u in class file %s",
 385                               tag,
 386                               THREAD);
 387         return;
 388       }
 389     } // end of switch(tag)
 390   } // end of for
 391 
 392   // Allocate the remaining symbols
 393   if (names_count > 0) {
 394     SymbolTable::new_symbols(_loader_data,
 395                              constantPoolHandle(THREAD, cp),
 396                              names_count,
 397                              names,
 398                              lengths,
 399                              indices,
 400                              hashValues);
 401   }
 402 
 403   // Copy _current pointer of local copy back to stream.
 404   assert(stream->current() == old_current, "non-exclusive use of stream");
 405   stream->set_current(cfs1.current());
 406 
 407 }
 408 
 409 static inline bool valid_cp_range(int index, int length) {
 410   return (index > 0 && index < length);
 411 }
 412 
 413 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 414   assert(cp != nullptr, "invariant");
 415   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 416     return cp->symbol_at(index);
 417   }
 418   return nullptr;
 419 }
 420 
 421 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 422                                          ConstantPool* const cp,
 423                                          const int length,
 424                                          TRAPS) {
 425   assert(cp != nullptr, "invariant");
 426   assert(stream != nullptr, "invariant");
 427 
 428   // parsing constant pool entries
 429   parse_constant_pool_entries(stream, cp, length, CHECK);
 430   if (class_bad_constant_seen() != 0) {
 431     // a bad CP entry has been detected previously so stop parsing and just return.
 432     return;
 433   }
 434 
 435   int index = 1;  // declared outside of loops for portability
 436   int num_klasses = 0;
 437 
 438   // first verification pass - validate cross references
 439   // and fixup class and string constants
 440   for (index = 1; index < length; index++) {          // Index 0 is unused
 441     const jbyte tag = cp->tag_at(index).value();
 442     switch (tag) {
 443       case JVM_CONSTANT_Class: {
 444         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 445         break;
 446       }
 447       case JVM_CONSTANT_Fieldref:
 448         // fall through
 449       case JVM_CONSTANT_Methodref:
 450         // fall through
 451       case JVM_CONSTANT_InterfaceMethodref: {
 452         if (!_need_verify) break;
 453         const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
 454         const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
 455         guarantee_property(valid_klass_reference_at(klass_ref_index),
 456                        "Invalid constant pool index %u in class file %s",
 457                        klass_ref_index, CHECK);
 458         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 459           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 460           "Invalid constant pool index %u in class file %s",
 461           name_and_type_ref_index, CHECK);
 462         break;
 463       }
 464       case JVM_CONSTANT_String: {
 465         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 466         break;
 467       }
 468       case JVM_CONSTANT_Integer:
 469         break;
 470       case JVM_CONSTANT_Float:
 471         break;
 472       case JVM_CONSTANT_Long:
 473       case JVM_CONSTANT_Double: {
 474         index++;
 475         guarantee_property(
 476           (index < length && cp->tag_at(index).is_invalid()),
 477           "Improper constant pool long/double index %u in class file %s",
 478           index, CHECK);
 479         break;
 480       }
 481       case JVM_CONSTANT_NameAndType: {
 482         if (!_need_verify) break;
 483         const int name_ref_index = cp->name_ref_index_at(index);
 484         const int signature_ref_index = cp->signature_ref_index_at(index);
 485         guarantee_property(valid_symbol_at(name_ref_index),
 486           "Invalid constant pool index %u in class file %s",
 487           name_ref_index, CHECK);
 488         guarantee_property(valid_symbol_at(signature_ref_index),
 489           "Invalid constant pool index %u in class file %s",
 490           signature_ref_index, CHECK);
 491         break;
 492       }
 493       case JVM_CONSTANT_Utf8:
 494         break;
 495       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 496       case JVM_CONSTANT_UnresolvedClassInError: {
 497         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 498         break;
 499       }
 500       case JVM_CONSTANT_ClassIndex: {
 501         const int class_index = cp->klass_index_at(index);
 502         guarantee_property(valid_symbol_at(class_index),
 503           "Invalid constant pool index %u in class file %s",
 504           class_index, CHECK);
 505 
 506         Symbol* const name = cp->symbol_at(class_index);
 507         const unsigned int name_len = name->utf8_length();
 508         cp->unresolved_klass_at_put(index, class_index, num_klasses++);
 509         break;
 510       }
 511       case JVM_CONSTANT_StringIndex: {
 512         const int string_index = cp->string_index_at(index);
 513         guarantee_property(valid_symbol_at(string_index),
 514           "Invalid constant pool index %u in class file %s",
 515           string_index, CHECK);
 516         Symbol* const sym = cp->symbol_at(string_index);
 517         cp->unresolved_string_at_put(index, sym);
 518         break;
 519       }
 520       case JVM_CONSTANT_MethodHandle: {
 521         const int ref_index = cp->method_handle_index_at(index);
 522         guarantee_property(valid_cp_range(ref_index, length),
 523           "Invalid constant pool index %u in class file %s",
 524           ref_index, CHECK);
 525         const constantTag tag = cp->tag_at(ref_index);
 526         const int ref_kind = cp->method_handle_ref_kind_at(index);
 527 
 528         switch (ref_kind) {
 529           case JVM_REF_getField:
 530           case JVM_REF_getStatic:
 531           case JVM_REF_putField:
 532           case JVM_REF_putStatic: {
 533             guarantee_property(
 534               tag.is_field(),
 535               "Invalid constant pool index %u in class file %s (not a field)",
 536               ref_index, CHECK);
 537             break;
 538           }
 539           case JVM_REF_invokeVirtual:
 540           case JVM_REF_newInvokeSpecial: {
 541             guarantee_property(
 542               tag.is_method(),
 543               "Invalid constant pool index %u in class file %s (not a method)",
 544               ref_index, CHECK);
 545             break;
 546           }
 547           case JVM_REF_invokeStatic:
 548           case JVM_REF_invokeSpecial: {
 549             guarantee_property(
 550               tag.is_method() ||
 551               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 552               "Invalid constant pool index %u in class file %s (not a method)",
 553               ref_index, CHECK);
 554             break;
 555           }
 556           case JVM_REF_invokeInterface: {
 557             guarantee_property(
 558               tag.is_interface_method(),
 559               "Invalid constant pool index %u in class file %s (not an interface method)",
 560               ref_index, CHECK);
 561             break;
 562           }
 563           default: {
 564             classfile_parse_error(
 565               "Bad method handle kind at constant pool index %u in class file %s",
 566               index, THREAD);
 567             return;
 568           }
 569         } // switch(refkind)
 570         // Keep the ref_index unchanged.  It will be indirected at link-time.
 571         break;
 572       } // case MethodHandle
 573       case JVM_CONSTANT_MethodType: {
 574         const int ref_index = cp->method_type_index_at(index);
 575         guarantee_property(valid_symbol_at(ref_index),
 576           "Invalid constant pool index %u in class file %s",
 577           ref_index, CHECK);
 578         break;
 579       }
 580       case JVM_CONSTANT_Dynamic: {
 581         const int name_and_type_ref_index =
 582           cp->bootstrap_name_and_type_ref_index_at(index);
 583 
 584         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 585           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 586           "Invalid constant pool index %u in class file %s",
 587           name_and_type_ref_index, CHECK);
 588         // bootstrap specifier index must be checked later,
 589         // when BootstrapMethods attr is available
 590 
 591         // Mark the constant pool as having a CONSTANT_Dynamic_info structure
 592         cp->set_has_dynamic_constant();
 593         break;
 594       }
 595       case JVM_CONSTANT_InvokeDynamic: {
 596         const int name_and_type_ref_index =
 597           cp->bootstrap_name_and_type_ref_index_at(index);
 598 
 599         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 600           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 601           "Invalid constant pool index %u in class file %s",
 602           name_and_type_ref_index, CHECK);
 603         // bootstrap specifier index must be checked later,
 604         // when BootstrapMethods attr is available
 605         break;
 606       }
 607       default: {
 608         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 609         ShouldNotReachHere();
 610         break;
 611       }
 612     } // switch(tag)
 613   } // end of for
 614 
 615   cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
 616 
 617   if (!_need_verify) {
 618     return;
 619   }
 620 
 621   // second verification pass - checks the strings are of the right format.
 622   // but not yet to the other entries
 623   for (index = 1; index < length; index++) {
 624     const jbyte tag = cp->tag_at(index).value();
 625     switch (tag) {
 626       case JVM_CONSTANT_UnresolvedClass: {
 627         const Symbol* const class_name = cp->klass_name_at(index);
 628         // check the name
 629         verify_legal_class_name(class_name, CHECK);
 630         break;
 631       }
 632       case JVM_CONSTANT_NameAndType: {
 633         if (_need_verify) {
 634           const int sig_index = cp->signature_ref_index_at(index);
 635           const int name_index = cp->name_ref_index_at(index);
 636           const Symbol* const name = cp->symbol_at(name_index);
 637           const Symbol* const sig = cp->symbol_at(sig_index);
 638           guarantee_property(sig->utf8_length() != 0,
 639             "Illegal zero length constant pool entry at %d in class %s",
 640             sig_index, CHECK);
 641           guarantee_property(name->utf8_length() != 0,
 642             "Illegal zero length constant pool entry at %d in class %s",
 643             name_index, CHECK);
 644 
 645           if (Signature::is_method(sig)) {
 646             // Format check method name and signature
 647             verify_legal_method_name(name, CHECK);
 648             verify_legal_method_signature(name, sig, CHECK);
 649           } else {
 650             // Format check field name and signature
 651             verify_legal_field_name(name, CHECK);
 652             verify_legal_field_signature(name, sig, CHECK);
 653           }
 654         }
 655         break;
 656       }
 657       case JVM_CONSTANT_Dynamic: {
 658         const int name_and_type_ref_index =
 659           cp->uncached_name_and_type_ref_index_at(index);
 660         // already verified to be utf8
 661         const int name_ref_index =
 662           cp->name_ref_index_at(name_and_type_ref_index);
 663         // already verified to be utf8
 664         const int signature_ref_index =
 665           cp->signature_ref_index_at(name_and_type_ref_index);
 666         const Symbol* const name = cp->symbol_at(name_ref_index);
 667         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 668         if (_need_verify) {
 669           // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
 670           // Need only to be sure signature is the right type.
 671           if (Signature::is_method(signature)) {
 672             throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
 673           }
 674         }
 675         break;
 676       }
 677       case JVM_CONSTANT_InvokeDynamic:
 678       case JVM_CONSTANT_Fieldref:
 679       case JVM_CONSTANT_Methodref:
 680       case JVM_CONSTANT_InterfaceMethodref: {
 681         const int name_and_type_ref_index =
 682           cp->uncached_name_and_type_ref_index_at(index);
 683         // already verified to be utf8
 684         const int name_ref_index =
 685           cp->name_ref_index_at(name_and_type_ref_index);
 686         // already verified to be utf8
 687         const int signature_ref_index =
 688           cp->signature_ref_index_at(name_and_type_ref_index);
 689         const Symbol* const name = cp->symbol_at(name_ref_index);
 690         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 691         if (tag == JVM_CONSTANT_Fieldref) {
 692           if (_need_verify) {
 693             // Field name and signature are verified above, when iterating NameAndType_info.
 694             // Need only to be sure signature is non-zero length and the right type.
 695             if (Signature::is_method(signature)) {
 696               throwIllegalSignature("Field", name, signature, CHECK);
 697             }
 698           }
 699         } else {
 700           if (_need_verify) {
 701             // Method name and signature are individually verified above, when iterating
 702             // NameAndType_info.  Need to check here that signature is non-zero length and
 703             // the right type.
 704             if (!Signature::is_method(signature)) {
 705               throwIllegalSignature("Method", name, signature, CHECK);
 706             }
 707           }
 708           // If a class method name begins with '<', it must be "<init>" and have void signature.
 709           const unsigned int name_len = name->utf8_length();
 710           if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
 711               name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
 712             if (name != vmSymbols::object_initializer_name()) {
 713               classfile_parse_error(
 714                 "Bad method name at constant pool index %u in class file %s",
 715                 name_ref_index, THREAD);
 716               return;
 717             } else if (!Signature::is_void_method(signature)) {  // must have void signature.
 718               throwIllegalSignature("Method", name, signature, CHECK);
 719             }
 720           }
 721         }
 722         break;
 723       }
 724       case JVM_CONSTANT_MethodHandle: {
 725         const int ref_index = cp->method_handle_index_at(index);
 726         const int ref_kind = cp->method_handle_ref_kind_at(index);
 727         switch (ref_kind) {
 728           case JVM_REF_invokeVirtual:
 729           case JVM_REF_invokeStatic:
 730           case JVM_REF_invokeSpecial:
 731           case JVM_REF_newInvokeSpecial: {
 732             const int name_and_type_ref_index =
 733               cp->uncached_name_and_type_ref_index_at(ref_index);
 734             const int name_ref_index =
 735               cp->name_ref_index_at(name_and_type_ref_index);
 736             const Symbol* const name = cp->symbol_at(name_ref_index);
 737 
 738             if (name != vmSymbols::object_initializer_name()) { // !<init>
 739               if (ref_kind == JVM_REF_newInvokeSpecial) {
 740                 classfile_parse_error(
 741                   "Bad constructor name at constant pool index %u in class file %s",
 742                     name_ref_index, THREAD);
 743                 return;
 744               }
 745             } else { // <init>
 746               // The allowed invocation mode of <init> depends on its signature.
 747               // This test corresponds to verify_invoke_instructions in the verifier.
 748               const int signature_ref_index =
 749                 cp->signature_ref_index_at(name_and_type_ref_index);
 750               const Symbol* const signature = cp->symbol_at(signature_ref_index);
 751               if (signature->is_void_method_signature()
 752                   && ref_kind == JVM_REF_newInvokeSpecial) {
 753                 // OK, could be a constructor call
 754               } else {
 755                 classfile_parse_error(
 756                   "Bad method name at constant pool index %u in class file %s",
 757                   name_ref_index, THREAD);
 758                 return;
 759               }
 760             }
 761             break;
 762           }
 763           // Other ref_kinds are already fully checked in previous pass.
 764         } // switch(ref_kind)
 765         break;
 766       }
 767       case JVM_CONSTANT_MethodType: {
 768         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 769         const Symbol* const signature = cp->method_type_signature_at(index);
 770         verify_legal_method_signature(no_name, signature, CHECK);
 771         break;
 772       }
 773       case JVM_CONSTANT_Utf8: {
 774         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 775       }
 776     }  // switch(tag)
 777   }  // end of for
 778 }
 779 
 780 class NameSigHash: public ResourceObj {
 781  public:
 782   const Symbol*       _name;       // name
 783   const Symbol*       _sig;        // signature
 784 
 785   static const int HASH_ROW_SIZE = 256;
 786 
 787   NameSigHash(Symbol* name, Symbol* sig) :
 788     _name(name),
 789     _sig(sig) {}
 790 
 791   static unsigned int hash(NameSigHash const& namesig) {
 792     return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
 793   }
 794 
 795   static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
 796     return (e0._name == e1._name) &&
 797           (e0._sig  == e1._sig);
 798   }
 799 };
 800 
 801 using NameSigHashtable = ResourceHashtable<NameSigHash, int,
 802                                            NameSigHash::HASH_ROW_SIZE,
 803                                            AnyObj::RESOURCE_AREA, mtInternal,
 804                                            &NameSigHash::hash, &NameSigHash::equals>;
 805 
 806 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
 807   assert(super_type != nullptr,"Method doesn't support null super type");
 808   if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
 809       && super_type->name() != vmSymbols::java_lang_Object()) {
 810       THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 811                 err_msg("Value type %s has an identity type as supertype",
 812                 current->class_name()->as_klass_external_name()));
 813   }
 814 }
 815 
 816 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
 817                                        int itfs_len,
 818                                        ConstantPool* cp,
 819                                        bool* const has_nonstatic_concrete_methods,
 820                                        // FIXME: lots of these functions
 821                                        // declare their parameters as const,
 822                                        // which adds only noise to the code.
 823                                        // Remove the spurious const modifiers.
 824                                        // Many are of the form "const int x"
 825                                        // or "T* const x".
 826                                        TRAPS) {
 827   assert(stream != nullptr, "invariant");
 828   assert(cp != nullptr, "invariant");
 829   assert(has_nonstatic_concrete_methods != nullptr, "invariant");
 830 
 831   if (itfs_len == 0) {
 832     _local_interfaces = Universe::the_empty_instance_klass_array();
 833 
 834   } else {
 835     assert(itfs_len > 0, "only called for len>0");
 836     _local_interface_indexes = new GrowableArray<u2>(itfs_len);
 837     int index = 0;
 838     for (index = 0; index < itfs_len; index++) {
 839       const u2 interface_index = stream->get_u2(CHECK);
 840       guarantee_property(
 841         valid_klass_reference_at(interface_index),
 842         "Interface name has bad constant pool index %u in class file %s",
 843         interface_index, CHECK);
 844       _local_interface_indexes->at_put_grow(index, interface_index);
 845     }
 846 
 847     if (!_need_verify || itfs_len <= 1) {
 848       return;
 849     }
 850 
 851     // Check if there's any duplicates in interfaces
 852     ResourceMark rm(THREAD);
 853     // Set containing interface names
 854     ResourceHashtable<Symbol*, int>* interface_names = new ResourceHashtable<Symbol*, int>();
 855     for (index = 0; index < itfs_len; index++) {
 856       Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));
 857       // If no duplicates, add (name, nullptr) in hashtable interface_names.
 858       if (!interface_names->put(interface_name, 0)) {
 859         classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
 860                                interface_name->as_C_string(), THREAD);
 861         return;
 862       }
 863     }
 864   }
 865 }
 866 
 867 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 868                                            int constantvalue_index,
 869                                            int signature_index,
 870                                            TRAPS) const {
 871   // Make sure the constant pool entry is of a type appropriate to this field
 872   guarantee_property(
 873     (constantvalue_index > 0 &&
 874       constantvalue_index < cp->length()),
 875     "Bad initial value index %u in ConstantValue attribute in class file %s",
 876     constantvalue_index, CHECK);
 877 
 878   const constantTag value_type = cp->tag_at(constantvalue_index);
 879   switch(cp->basic_type_for_signature_at(signature_index)) {
 880     case T_LONG: {
 881       guarantee_property(value_type.is_long(),
 882                          "Inconsistent constant value type in class file %s",
 883                          CHECK);
 884       break;
 885     }
 886     case T_FLOAT: {
 887       guarantee_property(value_type.is_float(),
 888                          "Inconsistent constant value type in class file %s",
 889                          CHECK);
 890       break;
 891     }
 892     case T_DOUBLE: {
 893       guarantee_property(value_type.is_double(),
 894                          "Inconsistent constant value type in class file %s",
 895                          CHECK);
 896       break;
 897     }
 898     case T_BYTE:
 899     case T_CHAR:
 900     case T_SHORT:
 901     case T_BOOLEAN:
 902     case T_INT: {
 903       guarantee_property(value_type.is_int(),
 904                          "Inconsistent constant value type in class file %s",
 905                          CHECK);
 906       break;
 907     }
 908     case T_OBJECT: {
 909       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 910                          && value_type.is_string()),
 911                          "Bad string initial value in class file %s",
 912                          CHECK);
 913       break;
 914     }
 915     default: {
 916       classfile_parse_error("Unable to set initial value %u in class file %s",
 917                              constantvalue_index,
 918                              THREAD);
 919     }
 920   }
 921 }
 922 
 923 class AnnotationCollector : public ResourceObj{
 924 public:
 925   enum Location { _in_field, _in_method, _in_class };
 926   enum ID {
 927     _unknown = 0,
 928     _method_CallerSensitive,
 929     _method_ForceInline,
 930     _method_DontInline,
 931     _method_ChangesCurrentThread,
 932     _method_JvmtiHideEvents,
 933     _method_JvmtiMountTransition,
 934     _method_InjectedProfile,
 935     _method_LambdaForm_Compiled,
 936     _method_Hidden,
 937     _method_Scoped,
 938     _method_IntrinsicCandidate,
 939     _jdk_internal_vm_annotation_Contended,
 940     _field_Stable,
 941     _jdk_internal_vm_annotation_ReservedStackAccess,
 942     _jdk_internal_ValueBased,
 943     _jdk_internal_ImplicitlyConstructible,
 944     _jdk_internal_LooselyConsistentValue,
 945     _jdk_internal_NullRestricted,
 946     _java_lang_Deprecated,
 947     _java_lang_Deprecated_for_removal,
 948     _annotation_LIMIT
 949   };
 950   const Location _location;
 951   int _annotations_present;
 952   u2 _contended_group;
 953 
 954   AnnotationCollector(Location location)
 955     : _location(location), _annotations_present(0), _contended_group(0)
 956   {
 957     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
 958   }
 959   // If this annotation name has an ID, report it (or _none).
 960   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
 961   // Set the annotation name:
 962   void set_annotation(ID id) {
 963     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 964     _annotations_present |= (int)nth_bit((int)id);
 965   }
 966 
 967   void remove_annotation(ID id) {
 968     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 969     _annotations_present &= (int)~nth_bit((int)id);
 970   }
 971 
 972   // Report if the annotation is present.
 973   bool has_any_annotations() const { return _annotations_present != 0; }
 974   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
 975 
 976   void set_contended_group(u2 group) { _contended_group = group; }
 977   u2 contended_group() const { return _contended_group; }
 978 
 979   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
 980 
 981   void set_stable(bool stable) { set_annotation(_field_Stable); }
 982   bool is_stable() const { return has_annotation(_field_Stable); }
 983 };
 984 
 985 // This class also doubles as a holder for metadata cleanup.
 986 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
 987 private:
 988   ClassLoaderData* _loader_data;
 989   AnnotationArray* _field_annotations;
 990   AnnotationArray* _field_type_annotations;
 991 public:
 992   FieldAnnotationCollector(ClassLoaderData* loader_data) :
 993     AnnotationCollector(_in_field),
 994     _loader_data(loader_data),
 995     _field_annotations(nullptr),
 996     _field_type_annotations(nullptr) {}
 997   ~FieldAnnotationCollector();
 998   void apply_to(FieldInfo* f);
 999   AnnotationArray* field_annotations()      { return _field_annotations; }
1000   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1001 
1002   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
1003   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1004 };
1005 
1006 class MethodAnnotationCollector : public AnnotationCollector{
1007 public:
1008   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1009   void apply_to(const methodHandle& m);
1010 };
1011 
1012 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1013 public:
1014   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1015   void apply_to(InstanceKlass* ik);
1016 };
1017 
1018 
1019 static int skip_annotation_value(const u1*, int, int); // fwd decl
1020 
1021 // Safely increment index by val if does not pass limit
1022 #define SAFE_ADD(index, limit, val) \
1023 if (index >= limit - val) return limit; \
1024 index += val;
1025 
1026 // Skip an annotation.  Return >=limit if there is any problem.
1027 static int skip_annotation(const u1* buffer, int limit, int index) {
1028   assert(buffer != nullptr, "invariant");
1029   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1030   // value := switch (tag:u1) { ... }
1031   SAFE_ADD(index, limit, 4); // skip atype and read nmem
1032   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1033   while (--nmem >= 0 && index < limit) {
1034     SAFE_ADD(index, limit, 2); // skip member
1035     index = skip_annotation_value(buffer, limit, index);
1036   }
1037   return index;
1038 }
1039 
1040 // Skip an annotation value.  Return >=limit if there is any problem.
1041 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1042   assert(buffer != nullptr, "invariant");
1043 
1044   // value := switch (tag:u1) {
1045   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1046   //   case e: e_class:u2 e_name:u2;
1047   //   case s: s_con:u2;
1048   //   case [: do(nval:u2) {value};
1049   //   case @: annotation;
1050   //   case s: s_con:u2;
1051   // }
1052   SAFE_ADD(index, limit, 1); // read tag
1053   const u1 tag = buffer[index - 1];
1054   switch (tag) {
1055     case 'B':
1056     case 'C':
1057     case 'I':
1058     case 'S':
1059     case 'Z':
1060     case 'D':
1061     case 'F':
1062     case 'J':
1063     case 'c':
1064     case 's':
1065       SAFE_ADD(index, limit, 2);  // skip con or s_con
1066       break;
1067     case 'e':
1068       SAFE_ADD(index, limit, 4);  // skip e_class, e_name
1069       break;
1070     case '[':
1071     {
1072       SAFE_ADD(index, limit, 2); // read nval
1073       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1074       while (--nval >= 0 && index < limit) {
1075         index = skip_annotation_value(buffer, limit, index);
1076       }
1077     }
1078     break;
1079     case '@':
1080       index = skip_annotation(buffer, limit, index);
1081       break;
1082     default:
1083       return limit;  //  bad tag byte
1084   }
1085   return index;
1086 }
1087 
1088 // Sift through annotations, looking for those significant to the VM:
1089 static void parse_annotations(const ConstantPool* const cp,
1090                               const u1* buffer, int limit,
1091                               AnnotationCollector* coll,
1092                               ClassLoaderData* loader_data,
1093                               const bool can_access_vm_annotations) {
1094 
1095   assert(cp != nullptr, "invariant");
1096   assert(buffer != nullptr, "invariant");
1097   assert(coll != nullptr, "invariant");
1098   assert(loader_data != nullptr, "invariant");
1099 
1100   // annotations := do(nann:u2) {annotation}
1101   int index = 2; // read nann
1102   if (index >= limit)  return;
1103   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1104   enum {  // initial annotation layout
1105     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1106     count_off = 2,      // u2   such as 1 (one value)
1107     member_off = 4,     // utf8 such as 'value'
1108     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1109     e_tag_val = 'e',
1110     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1111     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1112     e_size = 11,     // end of 'e' annotation
1113     c_tag_val = 'c',    // payload is type
1114     c_con_off = 7,    // utf8 payload, such as 'I'
1115     c_size = 9,       // end of 'c' annotation
1116     s_tag_val = 's',    // payload is String
1117     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1118     s_size = 9,
1119     b_tag_val = 'Z',  // payload is boolean
1120     min_size = 6        // smallest possible size (zero members)
1121   };
1122   // Cannot add min_size to index in case of overflow MAX_INT
1123   while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1124     int index0 = index;
1125     index = skip_annotation(buffer, limit, index);
1126     const u1* const abase = buffer + index0;
1127     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1128     const int count = Bytes::get_Java_u2((address)abase + count_off);
1129     const Symbol* const aname = check_symbol_at(cp, atype);
1130     if (aname == nullptr)  break;  // invalid annotation name
1131     const Symbol* member = nullptr;
1132     if (count >= 1) {
1133       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1134       member = check_symbol_at(cp, member_index);
1135       if (member == nullptr)  break;  // invalid member name
1136     }
1137 
1138     // Here is where parsing particular annotations will take place.
1139     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1140     if (AnnotationCollector::_unknown == id)  continue;
1141     coll->set_annotation(id);
1142     if (AnnotationCollector::_java_lang_Deprecated == id) {
1143       // @Deprecated can specify forRemoval=true, which we need
1144       // to record for JFR to use. If the annotation is not well-formed
1145       // then we may not be able to determine that.
1146       const u1* offset = abase + member_off;
1147       // There are only 2 members in @Deprecated.
1148       int n_members = MIN2(count, 2);
1149       for (int i = 0; i < n_members; ++i) {
1150         int member_index = Bytes::get_Java_u2((address)offset);
1151         offset += 2;
1152         member = check_symbol_at(cp, member_index);
1153         if (member == vmSymbols::since() &&
1154             (*((address)offset) == s_tag_val)) {
1155           // Found `since` first so skip over it
1156           offset += 3;
1157         }
1158         else if (member == vmSymbols::for_removal() &&
1159                  (*((address)offset) == b_tag_val)) {
1160           const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1161           // No guarantee the entry is valid so check it refers to an int in the CP.
1162           if (cp->is_within_bounds(boolean_value_index) &&
1163               cp->tag_at(boolean_value_index).is_int() &&
1164               cp->int_at(boolean_value_index) == 1) {
1165             // forRemoval == true
1166             coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1167           }
1168           break; // no need to check further
1169         }
1170         else {
1171           // This @Deprecated annotation is malformed so we don't try to
1172           // determine whether forRemoval is set.
1173           break;
1174         }
1175       }
1176       continue; // proceed to next annotation
1177     }
1178 
1179     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1180       // @Contended can optionally specify the contention group.
1181       //
1182       // Contended group defines the equivalence class over the fields:
1183       // the fields within the same contended group are not treated distinct.
1184       // The only exception is default group, which does not incur the
1185       // equivalence. Naturally, contention group for classes is meaningless.
1186       //
1187       // While the contention group is specified as String, annotation
1188       // values are already interned, and we might as well use the constant
1189       // pool index as the group tag.
1190       //
1191       u2 group_index = 0; // default contended group
1192       if (count == 1
1193         && s_size == (index - index0)  // match size
1194         && s_tag_val == *(abase + tag_off)
1195         && member == vmSymbols::value_name()) {
1196         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1197         // No guarantee the group_index is valid so check it refers to a
1198         // symbol in the CP.
1199         if (cp->is_within_bounds(group_index) &&
1200             cp->tag_at(group_index).is_utf8()) {
1201           // Seems valid, so check for empty string and reset
1202           if (cp->symbol_at(group_index)->utf8_length() == 0) {
1203             group_index = 0; // default contended group
1204           }
1205         } else {
1206           // Not valid so use the default
1207           group_index = 0;
1208         }
1209       }
1210       coll->set_contended_group(group_index);
1211       continue; // proceed to next annotation
1212     }
1213   }
1214 }
1215 
1216 
1217 // Parse attributes for a field.
1218 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1219                                              u2 attributes_count,
1220                                              bool is_static, u2 signature_index,
1221                                              u2* const constantvalue_index_addr,
1222                                              bool* const is_synthetic_addr,
1223                                              u2* const generic_signature_index_addr,
1224                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1225                                              TRAPS) {
1226   assert(cfs != nullptr, "invariant");
1227   assert(constantvalue_index_addr != nullptr, "invariant");
1228   assert(is_synthetic_addr != nullptr, "invariant");
1229   assert(generic_signature_index_addr != nullptr, "invariant");
1230   assert(parsed_annotations != nullptr, "invariant");
1231   assert(attributes_count > 0, "attributes_count should be greater than 0");
1232 
1233   u2 constantvalue_index = 0;
1234   u2 generic_signature_index = 0;
1235   bool is_synthetic = false;
1236   const u1* runtime_visible_annotations = nullptr;
1237   int runtime_visible_annotations_length = 0;
1238   const u1* runtime_visible_type_annotations = nullptr;
1239   int runtime_visible_type_annotations_length = 0;
1240   bool runtime_invisible_annotations_exists = false;
1241   bool runtime_invisible_type_annotations_exists = false;
1242   const ConstantPool* const cp = _cp;
1243 
1244   while (attributes_count--) {
1245     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1246     const u2 attribute_name_index = cfs->get_u2_fast();
1247     const u4 attribute_length = cfs->get_u4_fast();
1248     guarantee_property(valid_symbol_at(attribute_name_index),
1249                        "Invalid field attribute index %u in class file %s",
1250                        attribute_name_index,
1251                        CHECK);
1252 
1253     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1254     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1255       // ignore if non-static
1256       if (constantvalue_index != 0) {
1257         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1258         return;
1259       }
1260       guarantee_property(
1261         attribute_length == 2,
1262         "Invalid ConstantValue field attribute length %u in class file %s",
1263         attribute_length, CHECK);
1264 
1265       constantvalue_index = cfs->get_u2(CHECK);
1266       if (_need_verify) {
1267         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1268       }
1269     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1270       if (attribute_length != 0) {
1271         classfile_parse_error(
1272           "Invalid Synthetic field attribute length %u in class file %s",
1273           attribute_length, THREAD);
1274         return;
1275       }
1276       is_synthetic = true;
1277     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1278       if (attribute_length != 0) {
1279         classfile_parse_error(
1280           "Invalid Deprecated field attribute length %u in class file %s",
1281           attribute_length, THREAD);
1282         return;
1283       }
1284     } else if (_major_version >= JAVA_1_5_VERSION) {
1285       if (attribute_name == vmSymbols::tag_signature()) {
1286         if (generic_signature_index != 0) {
1287           classfile_parse_error(
1288             "Multiple Signature attributes for field in class file %s", THREAD);
1289           return;
1290         }
1291         if (attribute_length != 2) {
1292           classfile_parse_error(
1293             "Wrong size %u for field's Signature attribute in class file %s",
1294             attribute_length, THREAD);
1295           return;
1296         }
1297         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1298       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1299         if (runtime_visible_annotations != nullptr) {
1300           classfile_parse_error(
1301             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1302           return;
1303         }
1304         runtime_visible_annotations_length = attribute_length;
1305         runtime_visible_annotations = cfs->current();
1306         assert(runtime_visible_annotations != nullptr, "null visible annotations");
1307         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1308         parse_annotations(cp,
1309                           runtime_visible_annotations,
1310                           runtime_visible_annotations_length,
1311                           parsed_annotations,
1312                           _loader_data,
1313                           _can_access_vm_annotations);
1314         cfs->skip_u1_fast(runtime_visible_annotations_length);
1315       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1316         if (runtime_invisible_annotations_exists) {
1317           classfile_parse_error(
1318             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1319           return;
1320         }
1321         runtime_invisible_annotations_exists = true;
1322         cfs->skip_u1(attribute_length, CHECK);
1323       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1324         if (runtime_visible_type_annotations != nullptr) {
1325           classfile_parse_error(
1326             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1327           return;
1328         }
1329         runtime_visible_type_annotations_length = attribute_length;
1330         runtime_visible_type_annotations = cfs->current();
1331         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1332         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1333       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1334         if (runtime_invisible_type_annotations_exists) {
1335           classfile_parse_error(
1336             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1337           return;
1338         } else {
1339           runtime_invisible_type_annotations_exists = true;
1340         }
1341         cfs->skip_u1(attribute_length, CHECK);
1342       } else {
1343         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1344       }
1345     } else {
1346       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1347     }
1348   }
1349 
1350   *constantvalue_index_addr = constantvalue_index;
1351   *is_synthetic_addr = is_synthetic;
1352   *generic_signature_index_addr = generic_signature_index;
1353   AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1354                                             runtime_visible_annotations_length,
1355                                             CHECK);
1356   parsed_annotations->set_field_annotations(a);
1357   a = allocate_annotations(runtime_visible_type_annotations,
1358                            runtime_visible_type_annotations_length,
1359                            CHECK);
1360   parsed_annotations->set_field_type_annotations(a);
1361   return;
1362 }
1363 
1364 
1365 // Side-effects: populates the _fields, _fields_annotations,
1366 // _fields_type_annotations fields
1367 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1368                                    AccessFlags class_access_flags,
1369                                    ConstantPool* cp,
1370                                    const int cp_size,
1371                                    u2* const java_fields_count_ptr,
1372                                    TRAPS) {
1373 
1374   assert(cfs != nullptr, "invariant");
1375   assert(cp != nullptr, "invariant");
1376   assert(java_fields_count_ptr != nullptr, "invariant");
1377 
1378   assert(nullptr == _fields_annotations, "invariant");
1379   assert(nullptr == _fields_type_annotations, "invariant");
1380 
1381   bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1382   cfs->guarantee_more(2, CHECK);  // length
1383   const u2 length = cfs->get_u2_fast();
1384   *java_fields_count_ptr = length;
1385 
1386   int num_injected = 0;
1387   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1388                                                                   &num_injected);
1389 
1390   // two more slots are required for inline classes:
1391   // one for the static field with a reference to the pre-allocated default value
1392   // one for the field the JVM injects when detecting an empty inline class
1393   const int total_fields = length + num_injected + (is_inline_type ? 2 : 0);
1394 
1395   // Allocate a temporary resource array to collect field data.
1396   // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1397   _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1398 
1399   int instance_fields_count = 0;
1400   ResourceMark rm(THREAD);
1401   for (int n = 0; n < length; n++) {
1402     // access_flags, name_index, descriptor_index, attributes_count
1403     cfs->guarantee_more(8, CHECK);
1404 
1405     jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1406     if (!supports_inline_types()) {
1407       recognized_modifiers &= ~JVM_ACC_STRICT;
1408     }
1409 
1410     const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1411     verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1412     AccessFlags access_flags;
1413     access_flags.set_flags(flags);
1414     FieldInfo::FieldFlags fieldFlags(0);
1415 
1416     const u2 name_index = cfs->get_u2_fast();
1417     guarantee_property(valid_symbol_at(name_index),
1418       "Invalid constant pool index %u for field name in class file %s",
1419       name_index, CHECK);
1420     const Symbol* const name = cp->symbol_at(name_index);
1421     verify_legal_field_name(name, CHECK);
1422 
1423     const u2 signature_index = cfs->get_u2_fast();
1424     guarantee_property(valid_symbol_at(signature_index),
1425       "Invalid constant pool index %u for field signature in class file %s",
1426       signature_index, CHECK);
1427     const Symbol* const sig = cp->symbol_at(signature_index);
1428     verify_legal_field_signature(name, sig, CHECK);
1429     if (!access_flags.is_static()) instance_fields_count++;
1430 
1431     u2 constantvalue_index = 0;
1432     bool is_synthetic = false;
1433     u2 generic_signature_index = 0;
1434     const bool is_static = access_flags.is_static();
1435     FieldAnnotationCollector parsed_annotations(_loader_data);
1436 
1437     bool is_null_restricted = false;
1438 
1439     const u2 attributes_count = cfs->get_u2_fast();
1440     if (attributes_count > 0) {
1441       parse_field_attributes(cfs,
1442                              attributes_count,
1443                              is_static,
1444                              signature_index,
1445                              &constantvalue_index,
1446                              &is_synthetic,
1447                              &generic_signature_index,
1448                              &parsed_annotations,
1449                              CHECK);
1450 
1451       if (parsed_annotations.field_annotations() != nullptr) {
1452         if (_fields_annotations == nullptr) {
1453           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1454                                              _loader_data, length, nullptr,
1455                                              CHECK);
1456         }
1457         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1458         if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1459           if (!Signature::has_envelope(sig)) {
1460             Exceptions::fthrow(
1461               THREAD_AND_LOCATION,
1462               vmSymbols::java_lang_ClassFormatError(),
1463               "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s with signature %s (primitive types can never be null)",
1464               name->as_C_string(), sig->as_C_string());
1465           }
1466           is_null_restricted = true;
1467         }
1468         parsed_annotations.set_field_annotations(nullptr);
1469       }
1470       if (parsed_annotations.field_type_annotations() != nullptr) {
1471         if (_fields_type_annotations == nullptr) {
1472           _fields_type_annotations =
1473             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1474                                                          length,
1475                                                          nullptr,
1476                                                          CHECK);
1477         }
1478         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1479         parsed_annotations.set_field_type_annotations(nullptr);
1480       }
1481 
1482       if (is_synthetic) {
1483         access_flags.set_is_synthetic();
1484       }
1485       if (generic_signature_index != 0) {
1486         fieldFlags.update_generic(true);
1487       }
1488     }
1489 
1490     if (is_null_restricted) {
1491       fieldFlags.update_null_free_inline_type(true);
1492     }
1493 
1494     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1495 
1496     // Update number of static oop fields.
1497     if (is_static && is_reference_type(type)) {
1498       _static_oop_count++;
1499     }
1500 
1501     FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1502     fi.set_index(n);
1503     if (fieldFlags.is_generic()) {
1504       fi.set_generic_signature_index(generic_signature_index);
1505     }
1506     parsed_annotations.apply_to(&fi);
1507     if (fi.field_flags().is_contended()) {
1508       _has_contended_fields = true;
1509     }
1510     _temp_field_info->append(fi);
1511   }
1512   assert(_temp_field_info->length() == length, "Must be");
1513 
1514   if (num_injected != 0) {
1515     for (int n = 0; n < num_injected; n++) {
1516       // Check for duplicates
1517       if (injected[n].may_be_java) {
1518         const Symbol* const name      = injected[n].name();
1519         const Symbol* const signature = injected[n].signature();
1520         bool duplicate = false;
1521         for (int i = 0; i < length; i++) {
1522           const FieldInfo* const f = _temp_field_info->adr_at(i);
1523           if (name      == cp->symbol_at(f->name_index()) &&
1524               signature == cp->symbol_at(f->signature_index())) {
1525             // Symbol is desclared in Java so skip this one
1526             duplicate = true;
1527             break;
1528           }
1529         }
1530         if (duplicate) {
1531           // These will be removed from the field array at the end
1532           continue;
1533         }
1534       }
1535 
1536       // Injected field
1537       FieldInfo::FieldFlags fflags(0);
1538       fflags.update_injected(true);
1539       AccessFlags aflags;
1540       FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1541       int idx = _temp_field_info->append(fi);
1542       _temp_field_info->adr_at(idx)->set_index(idx);
1543     }
1544   }
1545 
1546   if (is_inline_type) {
1547     // Inject static ".default" field
1548     FieldInfo::FieldFlags fflags(0);
1549     fflags.update_injected(true);
1550     AccessFlags aflags(JVM_ACC_STATIC);
1551     FieldInfo fi(aflags,
1552                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(default_value_name)),
1553                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1554                  0,
1555                  fflags);
1556     int idx = _temp_field_info->append(fi);
1557     _temp_field_info->adr_at(idx)->set_index(idx);
1558     _static_oop_count++;
1559     // Inject static ".null_reset" field. This is the same as the .default field but will never have its null-channel set to non-zero.
1560     FieldInfo::FieldFlags fflags2(0);
1561     fflags2.update_injected(true);
1562     AccessFlags aflags2(JVM_ACC_STATIC);
1563     FieldInfo fi2(aflags2,
1564                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1565                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1566                  0,
1567                  fflags2);
1568     int idx2 = _temp_field_info->append(fi2);
1569     _temp_field_info->adr_at(idx2)->set_index(idx2);
1570     _static_oop_count++;
1571   }
1572 
1573   if (_need_verify && length > 1) {
1574     // Check duplicated fields
1575     ResourceMark rm(THREAD);
1576     // Set containing name-signature pairs
1577     NameSigHashtable* names_and_sigs = new NameSigHashtable();
1578     for (int i = 0; i < _temp_field_info->length(); i++) {
1579       NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1580                                _temp_field_info->adr_at(i)->signature(_cp));
1581       // If no duplicates, add name/signature in hashtable names_and_sigs.
1582       if(!names_and_sigs->put(name_and_sig, 0)) {
1583         classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1584                                name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1585         return;
1586       }
1587     }
1588   }
1589 }
1590 
1591 
1592 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1593                                                                          u4 code_length,
1594                                                                          u4 exception_table_length,
1595                                                                          TRAPS) {
1596   assert(cfs != nullptr, "invariant");
1597 
1598   const unsafe_u2* const exception_table_start = cfs->current();
1599   assert(exception_table_start != nullptr, "null exception table");
1600 
1601   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1602                                                                // end_pc,
1603                                                                // handler_pc,
1604                                                                // catch_type_index
1605 
1606   // Will check legal target after parsing code array in verifier.
1607   if (_need_verify) {
1608     for (unsigned int i = 0; i < exception_table_length; i++) {
1609       const u2 start_pc = cfs->get_u2_fast();
1610       const u2 end_pc = cfs->get_u2_fast();
1611       const u2 handler_pc = cfs->get_u2_fast();
1612       const u2 catch_type_index = cfs->get_u2_fast();
1613       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1614                          "Illegal exception table range in class file %s",
1615                          CHECK_NULL);
1616       guarantee_property(handler_pc < code_length,
1617                          "Illegal exception table handler in class file %s",
1618                          CHECK_NULL);
1619       if (catch_type_index != 0) {
1620         guarantee_property(valid_klass_reference_at(catch_type_index),
1621                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1622       }
1623     }
1624   } else {
1625     cfs->skip_u2_fast(exception_table_length * 4);
1626   }
1627   return exception_table_start;
1628 }
1629 
1630 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1631                                              u4 code_length,
1632                                              CompressedLineNumberWriteStream**const write_stream,
1633                                              TRAPS) {
1634 
1635   const ClassFileStream* const cfs = _stream;
1636   unsigned int num_entries = cfs->get_u2(CHECK);
1637 
1638   // Each entry is a u2 start_pc, and a u2 line_number
1639   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1640 
1641   // Verify line number attribute and table length
1642   guarantee_property(
1643     code_attribute_length == sizeof(u2) + length_in_bytes,
1644     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1645 
1646   cfs->guarantee_more(length_in_bytes, CHECK);
1647 
1648   if ((*write_stream) == nullptr) {
1649     if (length_in_bytes > fixed_buffer_size) {
1650       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1651     } else {
1652       (*write_stream) = new CompressedLineNumberWriteStream(
1653         _linenumbertable_buffer, fixed_buffer_size);
1654     }
1655   }
1656 
1657   while (num_entries-- > 0) {
1658     const u2 bci  = cfs->get_u2_fast(); // start_pc
1659     const u2 line = cfs->get_u2_fast(); // line_number
1660     guarantee_property(bci < code_length,
1661         "Invalid pc in LineNumberTable in class file %s", CHECK);
1662     (*write_stream)->write_pair(bci, line);
1663   }
1664 }
1665 
1666 
1667 class LVT_Hash : public AllStatic {
1668  public:
1669 
1670   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1671   /*
1672    * 3-tuple start_bci/length/slot has to be unique key,
1673    * so the following comparison seems to be redundant:
1674    *       && elem->name_cp_index == entry->_elem->name_cp_index
1675    */
1676     return (e0.start_bci     == e1.start_bci &&
1677             e0.length        == e1.length &&
1678             e0.name_cp_index == e1.name_cp_index &&
1679             e0.slot          == e1.slot);
1680   }
1681 
1682   static unsigned int hash(LocalVariableTableElement const& e0) {
1683     unsigned int raw_hash = e0.start_bci;
1684 
1685     raw_hash = e0.length        + raw_hash * 37;
1686     raw_hash = e0.name_cp_index + raw_hash * 37;
1687     raw_hash = e0.slot          + raw_hash * 37;
1688 
1689     return raw_hash;
1690   }
1691 };
1692 
1693 
1694 // Class file LocalVariableTable elements.
1695 class Classfile_LVT_Element {
1696  public:
1697   u2 start_bci;
1698   u2 length;
1699   u2 name_cp_index;
1700   u2 descriptor_cp_index;
1701   u2 slot;
1702 };
1703 
1704 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1705                              LocalVariableTableElement* const lvt) {
1706   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1707   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1708   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1709   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1710   lvt->signature_cp_index  = 0;
1711   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1712 }
1713 
1714 // Function is used to parse both attributes:
1715 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1716 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1717                                                                              u4 code_length,
1718                                                                              u2 max_locals,
1719                                                                              u4 code_attribute_length,
1720                                                                              u2* const localvariable_table_length,
1721                                                                              bool isLVTT,
1722                                                                              TRAPS) {
1723   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1724   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1725   const unsigned int size = checked_cast<unsigned>(
1726     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1727 
1728   const ConstantPool* const cp = _cp;
1729 
1730   // Verify local variable table attribute has right length
1731   if (_need_verify) {
1732     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1733                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1734   }
1735 
1736   const unsafe_u2* const localvariable_table_start = cfs->current();
1737   assert(localvariable_table_start != nullptr, "null local variable table");
1738   if (!_need_verify) {
1739     cfs->skip_u2_fast(size);
1740   } else {
1741     cfs->guarantee_more(size * 2, CHECK_NULL);
1742     for(int i = 0; i < (*localvariable_table_length); i++) {
1743       const u2 start_pc = cfs->get_u2_fast();
1744       const u2 length = cfs->get_u2_fast();
1745       const u2 name_index = cfs->get_u2_fast();
1746       const u2 descriptor_index = cfs->get_u2_fast();
1747       const u2 index = cfs->get_u2_fast();
1748       // Assign to a u4 to avoid overflow
1749       const u4 end_pc = (u4)start_pc + (u4)length;
1750 
1751       if (start_pc >= code_length) {
1752         classfile_parse_error(
1753           "Invalid start_pc %u in %s in class file %s",
1754           start_pc, tbl_name, THREAD);
1755         return nullptr;
1756       }
1757       if (end_pc > code_length) {
1758         classfile_parse_error(
1759           "Invalid length %u in %s in class file %s",
1760           length, tbl_name, THREAD);
1761         return nullptr;
1762       }
1763       const int cp_size = cp->length();
1764       guarantee_property(valid_symbol_at(name_index),
1765         "Name index %u in %s has bad constant type in class file %s",
1766         name_index, tbl_name, CHECK_NULL);
1767       guarantee_property(valid_symbol_at(descriptor_index),
1768         "Signature index %u in %s has bad constant type in class file %s",
1769         descriptor_index, tbl_name, CHECK_NULL);
1770 
1771       const Symbol* const name = cp->symbol_at(name_index);
1772       const Symbol* const sig = cp->symbol_at(descriptor_index);
1773       verify_legal_field_name(name, CHECK_NULL);
1774       u2 extra_slot = 0;
1775       if (!isLVTT) {
1776         verify_legal_field_signature(name, sig, CHECK_NULL);
1777 
1778         // 4894874: check special cases for double and long local variables
1779         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1780             sig == vmSymbols::type_signature(T_LONG)) {
1781           extra_slot = 1;
1782         }
1783       }
1784       guarantee_property((index + extra_slot) < max_locals,
1785                           "Invalid index %u in %s in class file %s",
1786                           index, tbl_name, CHECK_NULL);
1787     }
1788   }
1789   return localvariable_table_start;
1790 }
1791 
1792 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1793                                       u4 code_attribute_length,
1794                                       TRAPS) {
1795   assert(cfs != nullptr, "invariant");
1796 
1797   if (0 == code_attribute_length) {
1798     return nullptr;
1799   }
1800 
1801   const u1* const stackmap_table_start = cfs->current();
1802   assert(stackmap_table_start != nullptr, "null stackmap table");
1803 
1804   // check code_attribute_length
1805   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1806 
1807   return stackmap_table_start;
1808 }
1809 
1810 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1811                                                                             u2* const checked_exceptions_length,
1812                                                                             u4 method_attribute_length,
1813                                                                             TRAPS) {
1814   assert(cfs != nullptr, "invariant");
1815   assert(checked_exceptions_length != nullptr, "invariant");
1816 
1817   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1818   *checked_exceptions_length = cfs->get_u2_fast();
1819   const unsigned int size =
1820     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1821   const unsafe_u2* const checked_exceptions_start = cfs->current();
1822   assert(checked_exceptions_start != nullptr, "null checked exceptions");
1823   if (!_need_verify) {
1824     cfs->skip_u2_fast(size);
1825   } else {
1826     // Verify each value in the checked exception table
1827     u2 checked_exception;
1828     const u2 len = *checked_exceptions_length;
1829     cfs->guarantee_more(2 * len, CHECK_NULL);
1830     for (int i = 0; i < len; i++) {
1831       checked_exception = cfs->get_u2_fast();
1832       guarantee_property(
1833         valid_klass_reference_at(checked_exception),
1834         "Exception name has bad type at constant pool %u in class file %s",
1835         checked_exception, CHECK_NULL);
1836     }
1837   }
1838   // check exceptions attribute length
1839   if (_need_verify) {
1840     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1841                                                    sizeof(u2) * size),
1842                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1843   }
1844   return checked_exceptions_start;
1845 }
1846 
1847 void ClassFileParser::throwIllegalSignature(const char* type,
1848                                             const Symbol* name,
1849                                             const Symbol* sig,
1850                                             TRAPS) const {
1851   assert(name != nullptr, "invariant");
1852   assert(sig != nullptr, "invariant");
1853 
1854   ResourceMark rm(THREAD);
1855   // Names are all known to be < 64k so we know this formatted message is not excessively large.
1856   Exceptions::fthrow(THREAD_AND_LOCATION,
1857       vmSymbols::java_lang_ClassFormatError(),
1858       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1859       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1860 }
1861 
1862 AnnotationCollector::ID
1863 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1864                                       const Symbol* name,
1865                                       const bool can_access_vm_annotations) {
1866   const vmSymbolID sid = vmSymbols::find_sid(name);
1867   // Privileged code can use all annotations.  Other code silently drops some.
1868   const bool privileged = loader_data->is_boot_class_loader_data() ||
1869                           loader_data->is_platform_class_loader_data() ||
1870                           can_access_vm_annotations;
1871   switch (sid) {
1872     case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1873       if (_location != _in_method)  break;  // only allow for methods
1874       if (!privileged)              break;  // only allow in privileged code
1875       return _method_CallerSensitive;
1876     }
1877     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1878       if (_location != _in_method)  break;  // only allow for methods
1879       if (!privileged)              break;  // only allow in privileged code
1880       return _method_ForceInline;
1881     }
1882     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1883       if (_location != _in_method)  break;  // only allow for methods
1884       if (!privileged)              break;  // only allow in privileged code
1885       return _method_DontInline;
1886     }
1887     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1888       if (_location != _in_method)  break;  // only allow for methods
1889       if (!privileged)              break;  // only allow in privileged code
1890       return _method_ChangesCurrentThread;
1891     }
1892     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1893       if (_location != _in_method)  break;  // only allow for methods
1894       if (!privileged)              break;  // only allow in privileged code
1895       return _method_JvmtiHideEvents;
1896     }
1897     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1898       if (_location != _in_method)  break;  // only allow for methods
1899       if (!privileged)              break;  // only allow in privileged code
1900       return _method_JvmtiMountTransition;
1901     }
1902     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1903       if (_location != _in_method)  break;  // only allow for methods
1904       if (!privileged)              break;  // only allow in privileged code
1905       return _method_InjectedProfile;
1906     }
1907     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1908       if (_location != _in_method)  break;  // only allow for methods
1909       if (!privileged)              break;  // only allow in privileged code
1910       return _method_LambdaForm_Compiled;
1911     }
1912     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1913       if (_location != _in_method)  break;  // only allow for methods
1914       if (!privileged)              break;  // only allow in privileged code
1915       return _method_Hidden;
1916     }
1917     case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1918       if (_location != _in_method)  break;  // only allow for methods
1919       if (!privileged)              break;  // only allow in privileged code
1920       return _method_Scoped;
1921     }
1922     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1923       if (_location != _in_method)  break;  // only allow for methods
1924       if (!privileged)              break;  // only allow in privileged code
1925       return _method_IntrinsicCandidate;
1926     }
1927     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1928       if (_location != _in_field)   break;  // only allow for fields
1929       if (!privileged)              break;  // only allow in privileged code
1930       return _field_Stable;
1931     }
1932     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1933       if (_location != _in_field && _location != _in_class) {
1934         break;  // only allow for fields and classes
1935       }
1936       if (!EnableContended || (RestrictContended && !privileged)) {
1937         break;  // honor privileges
1938       }
1939       return _jdk_internal_vm_annotation_Contended;
1940     }
1941     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1942       if (_location != _in_method)  break;  // only allow for methods
1943       if (RestrictReservedStack && !privileged) break; // honor privileges
1944       return _jdk_internal_vm_annotation_ReservedStackAccess;
1945     }
1946     case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1947       if (_location != _in_class)   break;  // only allow for classes
1948       if (!privileged)              break;  // only allow in privileged code
1949       return _jdk_internal_ValueBased;
1950     }
1951     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ImplicitlyConstructible_signature): {
1952       if (_location != _in_class)   break; // only allow for classes
1953       return _jdk_internal_ImplicitlyConstructible;
1954     }
1955     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1956       if (_location != _in_class)   break; // only allow for classes
1957       return _jdk_internal_LooselyConsistentValue;
1958     }
1959     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1960       if (_location != _in_field)   break; // only allow for fields
1961       return _jdk_internal_NullRestricted;
1962     }
1963     case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1964       return _java_lang_Deprecated;
1965     }
1966     default: {
1967       break;
1968     }
1969   }
1970   return AnnotationCollector::_unknown;
1971 }
1972 
1973 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
1974   if (is_contended())
1975     // Setting the contended group also sets the contended bit in field flags
1976     f->set_contended_group(contended_group());
1977   if (is_stable())
1978     (f->field_flags_addr())->update_stable(true);
1979 }
1980 
1981 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
1982   // If there's an error deallocate metadata for field annotations
1983   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
1984   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
1985 }
1986 
1987 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
1988   if (has_annotation(_method_CallerSensitive))
1989     m->set_caller_sensitive();
1990   if (has_annotation(_method_ForceInline))
1991     m->set_force_inline();
1992   if (has_annotation(_method_DontInline))
1993     m->set_dont_inline();
1994   if (has_annotation(_method_ChangesCurrentThread))
1995     m->set_changes_current_thread();
1996   if (has_annotation(_method_JvmtiHideEvents))
1997     m->set_jvmti_hide_events();
1998   if (has_annotation(_method_JvmtiMountTransition))
1999     m->set_jvmti_mount_transition();
2000   if (has_annotation(_method_InjectedProfile))
2001     m->set_has_injected_profile();
2002   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2003     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2004   if (has_annotation(_method_Hidden))
2005     m->set_is_hidden();
2006   if (has_annotation(_method_Scoped))
2007     m->set_scoped();
2008   if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2009     m->set_intrinsic_candidate();
2010   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2011     m->set_has_reserved_stack_access();
2012   if (has_annotation(_java_lang_Deprecated))
2013     m->set_deprecated();
2014   if (has_annotation(_java_lang_Deprecated_for_removal))
2015     m->set_deprecated_for_removal();
2016 }
2017 
2018 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2019   assert(ik != nullptr, "invariant");
2020   if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2021     ik->set_is_contended(is_contended());
2022   }
2023   if (has_annotation(_jdk_internal_ValueBased)) {
2024     ik->set_has_value_based_class_annotation();
2025     if (DiagnoseSyncOnValueBasedClasses) {
2026       ik->set_is_value_based();
2027     }
2028   }
2029   if (has_annotation(_java_lang_Deprecated)) {
2030     Array<Method*>* methods = ik->methods();
2031     int length = ik->methods()->length();
2032     for (int i = 0; i < length; i++) {
2033       Method* m = methods->at(i);
2034       m->set_deprecated();
2035     }
2036   }
2037   if (has_annotation(_java_lang_Deprecated_for_removal)) {
2038     Array<Method*>* methods = ik->methods();
2039     int length = ik->methods()->length();
2040     for (int i = 0; i < length; i++) {
2041       Method* m = methods->at(i);
2042       m->set_deprecated_for_removal();
2043     }
2044   }
2045 }
2046 
2047 #define MAX_ARGS_SIZE 255
2048 #define MAX_CODE_SIZE 65535
2049 #define INITIAL_MAX_LVT_NUMBER 256
2050 
2051 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2052  *
2053  * Rules for LVT's and LVTT's are:
2054  *   - There can be any number of LVT's and LVTT's.
2055  *   - If there are n LVT's, it is the same as if there was just
2056  *     one LVT containing all the entries from the n LVT's.
2057  *   - There may be no more than one LVT entry per local variable.
2058  *     Two LVT entries are 'equal' if these fields are the same:
2059  *        start_pc, length, name, slot
2060  *   - There may be no more than one LVTT entry per each LVT entry.
2061  *     Each LVTT entry has to match some LVT entry.
2062  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2063  */
2064 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2065                                                int lvt_cnt,
2066                                                u2* const localvariable_table_length,
2067                                                const unsafe_u2** const localvariable_table_start,
2068                                                int lvtt_cnt,
2069                                                u2* const localvariable_type_table_length,
2070                                                const unsafe_u2** const localvariable_type_table_start,
2071                                                TRAPS) {
2072 
2073   ResourceMark rm(THREAD);
2074 
2075   typedef ResourceHashtable<LocalVariableTableElement, LocalVariableTableElement*,
2076                             256, AnyObj::RESOURCE_AREA, mtInternal,
2077                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2078 
2079   LVT_HashTable* const table = new LVT_HashTable();
2080 
2081   // To fill LocalVariableTable in
2082   const Classfile_LVT_Element* cf_lvt;
2083   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2084 
2085   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2086     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2087     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2088       copy_lvt_element(&cf_lvt[idx], lvt);
2089       // If no duplicates, add LVT elem in hashtable.
2090       if (table->put(*lvt, lvt) == false
2091           && _need_verify
2092           && _major_version >= JAVA_1_5_VERSION) {
2093         classfile_parse_error("Duplicated LocalVariableTable attribute "
2094                               "entry for '%s' in class file %s",
2095                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2096                                THREAD);
2097         return;
2098       }
2099     }
2100   }
2101 
2102   // To merge LocalVariableTable and LocalVariableTypeTable
2103   const Classfile_LVT_Element* cf_lvtt;
2104   LocalVariableTableElement lvtt_elem;
2105 
2106   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2107     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2108     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2109       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2110       LocalVariableTableElement** entry = table->get(lvtt_elem);
2111       if (entry == nullptr) {
2112         if (_need_verify) {
2113           classfile_parse_error("LVTT entry for '%s' in class file %s "
2114                                 "does not match any LVT entry",
2115                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2116                                  THREAD);
2117           return;
2118         }
2119       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2120         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2121                               "entry for '%s' in class file %s",
2122                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2123                                THREAD);
2124         return;
2125       } else {
2126         // to add generic signatures into LocalVariableTable
2127         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2128       }
2129     }
2130   }
2131 }
2132 
2133 
2134 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2135                                        const u1* runtime_visible_annotations,
2136                                        int runtime_visible_annotations_length,
2137                                        const u1* runtime_visible_parameter_annotations,
2138                                        int runtime_visible_parameter_annotations_length,
2139                                        const u1* runtime_visible_type_annotations,
2140                                        int runtime_visible_type_annotations_length,
2141                                        const u1* annotation_default,
2142                                        int annotation_default_length,
2143                                        TRAPS) {
2144 
2145   AnnotationArray* a;
2146 
2147   if (runtime_visible_annotations_length > 0) {
2148      a = allocate_annotations(runtime_visible_annotations,
2149                               runtime_visible_annotations_length,
2150                               CHECK);
2151      cm->set_method_annotations(a);
2152   }
2153 
2154   if (runtime_visible_parameter_annotations_length > 0) {
2155     a = allocate_annotations(runtime_visible_parameter_annotations,
2156                              runtime_visible_parameter_annotations_length,
2157                              CHECK);
2158     cm->set_parameter_annotations(a);
2159   }
2160 
2161   if (annotation_default_length > 0) {
2162     a = allocate_annotations(annotation_default,
2163                              annotation_default_length,
2164                              CHECK);
2165     cm->set_default_annotations(a);
2166   }
2167 
2168   if (runtime_visible_type_annotations_length > 0) {
2169     a = allocate_annotations(runtime_visible_type_annotations,
2170                              runtime_visible_type_annotations_length,
2171                              CHECK);
2172     cm->set_type_annotations(a);
2173   }
2174 }
2175 
2176 
2177 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2178 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2179 // Method* to save footprint, so we only know the size of the resulting Method* when the
2180 // entire method attribute is parsed.
2181 //
2182 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2183 
2184 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2185                                       bool is_interface,
2186                                       bool is_value_class,
2187                                       bool is_abstract_class,
2188                                       const ConstantPool* cp,
2189                                       bool* const has_localvariable_table,
2190                                       TRAPS) {
2191   assert(cfs != nullptr, "invariant");
2192   assert(cp != nullptr, "invariant");
2193   assert(has_localvariable_table != nullptr, "invariant");
2194 
2195   ResourceMark rm(THREAD);
2196   // Parse fixed parts:
2197   // access_flags, name_index, descriptor_index, attributes_count
2198   cfs->guarantee_more(8, CHECK_NULL);
2199 
2200   u2 flags = cfs->get_u2_fast();
2201   const u2 name_index = cfs->get_u2_fast();
2202   const int cp_size = cp->length();
2203   guarantee_property(
2204     valid_symbol_at(name_index),
2205     "Illegal constant pool index %u for method name in class file %s",
2206     name_index, CHECK_NULL);
2207   const Symbol* const name = cp->symbol_at(name_index);
2208   verify_legal_method_name(name, CHECK_NULL);
2209 
2210   const u2 signature_index = cfs->get_u2_fast();
2211   guarantee_property(
2212     valid_symbol_at(signature_index),
2213     "Illegal constant pool index %u for method signature in class file %s",
2214     signature_index, CHECK_NULL);
2215   const Symbol* const signature = cp->symbol_at(signature_index);
2216 
2217   if (name == vmSymbols::class_initializer_name()) {
2218     // We ignore the other access flags for a valid class initializer.
2219     // (JVM Spec 2nd ed., chapter 4.6)
2220     if (_major_version < 51) { // backward compatibility
2221       flags = JVM_ACC_STATIC;
2222     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2223       flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2224     } else {
2225       classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2226       return nullptr;
2227     }
2228   } else {
2229     verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2230   }
2231 
2232   if (name == vmSymbols::object_initializer_name() && is_interface) {
2233     classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2234     return nullptr;
2235   }
2236 
2237   if (EnableValhalla) {
2238     if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2239         && ((flags & JVM_ACC_STATIC) == 0 )
2240         && !_access_flags.is_identity_class()) {
2241       classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2242         return nullptr;
2243     }
2244   }
2245 
2246   int args_size = -1;  // only used when _need_verify is true
2247   if (_need_verify) {
2248     verify_legal_name_with_signature(name, signature, CHECK_NULL);
2249     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2250                  verify_legal_method_signature(name, signature, CHECK_NULL);
2251     if (args_size > MAX_ARGS_SIZE) {
2252       classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2253       return nullptr;
2254     }
2255   }
2256 
2257   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2258 
2259   // Default values for code and exceptions attribute elements
2260   u2 max_stack = 0;
2261   u2 max_locals = 0;
2262   u4 code_length = 0;
2263   const u1* code_start = nullptr;
2264   u2 exception_table_length = 0;
2265   const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2266   Array<int>* exception_handlers = Universe::the_empty_int_array();
2267   u2 checked_exceptions_length = 0;
2268   const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2269   CompressedLineNumberWriteStream* linenumber_table = nullptr;
2270   int linenumber_table_length = 0;
2271   int total_lvt_length = 0;
2272   u2 lvt_cnt = 0;
2273   u2 lvtt_cnt = 0;
2274   bool lvt_allocated = false;
2275   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2276   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2277   u2* localvariable_table_length = nullptr;
2278   const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2279   u2* localvariable_type_table_length = nullptr;
2280   const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2281   int method_parameters_length = -1;
2282   const u1* method_parameters_data = nullptr;
2283   bool method_parameters_seen = false;
2284   bool parsed_code_attribute = false;
2285   bool parsed_checked_exceptions_attribute = false;
2286   bool parsed_stackmap_attribute = false;
2287   // stackmap attribute - JDK1.5
2288   const u1* stackmap_data = nullptr;
2289   int stackmap_data_length = 0;
2290   u2 generic_signature_index = 0;
2291   MethodAnnotationCollector parsed_annotations;
2292   const u1* runtime_visible_annotations = nullptr;
2293   int runtime_visible_annotations_length = 0;
2294   const u1* runtime_visible_parameter_annotations = nullptr;
2295   int runtime_visible_parameter_annotations_length = 0;
2296   const u1* runtime_visible_type_annotations = nullptr;
2297   int runtime_visible_type_annotations_length = 0;
2298   bool runtime_invisible_annotations_exists = false;
2299   bool runtime_invisible_type_annotations_exists = false;
2300   bool runtime_invisible_parameter_annotations_exists = false;
2301   const u1* annotation_default = nullptr;
2302   int annotation_default_length = 0;
2303 
2304   // Parse code and exceptions attribute
2305   u2 method_attributes_count = cfs->get_u2_fast();
2306   while (method_attributes_count--) {
2307     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2308     const u2 method_attribute_name_index = cfs->get_u2_fast();
2309     const u4 method_attribute_length = cfs->get_u4_fast();
2310     guarantee_property(
2311       valid_symbol_at(method_attribute_name_index),
2312       "Invalid method attribute name index %u in class file %s",
2313       method_attribute_name_index, CHECK_NULL);
2314 
2315     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2316     if (method_attribute_name == vmSymbols::tag_code()) {
2317       // Parse Code attribute
2318       if (_need_verify) {
2319         guarantee_property(
2320             !access_flags.is_native() && !access_flags.is_abstract(),
2321                         "Code attribute in native or abstract methods in class file %s",
2322                          CHECK_NULL);
2323       }
2324       if (parsed_code_attribute) {
2325         classfile_parse_error("Multiple Code attributes in class file %s",
2326                               THREAD);
2327         return nullptr;
2328       }
2329       parsed_code_attribute = true;
2330 
2331       // Stack size, locals size, and code size
2332       cfs->guarantee_more(8, CHECK_NULL);
2333       max_stack = cfs->get_u2_fast();
2334       max_locals = cfs->get_u2_fast();
2335       code_length = cfs->get_u4_fast();
2336       if (_need_verify) {
2337         guarantee_property(args_size <= max_locals,
2338                            "Arguments can't fit into locals in class file %s",
2339                            CHECK_NULL);
2340         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2341                            "Invalid method Code length %u in class file %s",
2342                            code_length, CHECK_NULL);
2343       }
2344       // Code pointer
2345       code_start = cfs->current();
2346       assert(code_start != nullptr, "null code start");
2347       cfs->guarantee_more(code_length, CHECK_NULL);
2348       cfs->skip_u1_fast(code_length);
2349 
2350       // Exception handler table
2351       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2352       exception_table_length = cfs->get_u2_fast();
2353       if (exception_table_length > 0) {
2354         exception_table_start = parse_exception_table(cfs,
2355                                                       code_length,
2356                                                       exception_table_length,
2357                                                       CHECK_NULL);
2358       }
2359 
2360       // Parse additional attributes in code attribute
2361       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2362       u2 code_attributes_count = cfs->get_u2_fast();
2363 
2364       unsigned int calculated_attribute_length = 0;
2365 
2366       calculated_attribute_length =
2367           sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2368       calculated_attribute_length += checked_cast<unsigned int>(
2369         code_length +
2370         sizeof(exception_table_length) +
2371         sizeof(code_attributes_count) +
2372         exception_table_length *
2373             ( sizeof(u2) +   // start_pc
2374               sizeof(u2) +   // end_pc
2375               sizeof(u2) +   // handler_pc
2376               sizeof(u2) )); // catch_type_index
2377 
2378       while (code_attributes_count--) {
2379         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2380         const u2 code_attribute_name_index = cfs->get_u2_fast();
2381         const u4 code_attribute_length = cfs->get_u4_fast();
2382         calculated_attribute_length += code_attribute_length +
2383                                        (unsigned)sizeof(code_attribute_name_index) +
2384                                        (unsigned)sizeof(code_attribute_length);
2385         guarantee_property(valid_symbol_at(code_attribute_name_index),
2386                            "Invalid code attribute name index %u in class file %s",
2387                            code_attribute_name_index,
2388                            CHECK_NULL);
2389         if (LoadLineNumberTables &&
2390             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2391           // Parse and compress line number table
2392           parse_linenumber_table(code_attribute_length,
2393                                  code_length,
2394                                  &linenumber_table,
2395                                  CHECK_NULL);
2396 
2397         } else if (LoadLocalVariableTables &&
2398                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2399           // Parse local variable table
2400           if (!lvt_allocated) {
2401             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2402               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2403             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2404               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2405             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2406               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2407             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2408               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2409             lvt_allocated = true;
2410           }
2411           if (lvt_cnt == max_lvt_cnt) {
2412             max_lvt_cnt <<= 1;
2413             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2414             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2415           }
2416           localvariable_table_start[lvt_cnt] =
2417             parse_localvariable_table(cfs,
2418                                       code_length,
2419                                       max_locals,
2420                                       code_attribute_length,
2421                                       &localvariable_table_length[lvt_cnt],
2422                                       false,    // is not LVTT
2423                                       CHECK_NULL);
2424           total_lvt_length += localvariable_table_length[lvt_cnt];
2425           lvt_cnt++;
2426         } else if (LoadLocalVariableTypeTables &&
2427                    _major_version >= JAVA_1_5_VERSION &&
2428                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2429           if (!lvt_allocated) {
2430             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2431               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2432             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2433               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2434             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2435               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2436             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2437               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2438             lvt_allocated = true;
2439           }
2440           // Parse local variable type table
2441           if (lvtt_cnt == max_lvtt_cnt) {
2442             max_lvtt_cnt <<= 1;
2443             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2444             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2445           }
2446           localvariable_type_table_start[lvtt_cnt] =
2447             parse_localvariable_table(cfs,
2448                                       code_length,
2449                                       max_locals,
2450                                       code_attribute_length,
2451                                       &localvariable_type_table_length[lvtt_cnt],
2452                                       true,     // is LVTT
2453                                       CHECK_NULL);
2454           lvtt_cnt++;
2455         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2456                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2457           // Stack map is only needed by the new verifier in JDK1.5.
2458           if (parsed_stackmap_attribute) {
2459             classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2460             return nullptr;
2461           }
2462           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2463           stackmap_data_length = code_attribute_length;
2464           parsed_stackmap_attribute = true;
2465         } else {
2466           // Skip unknown attributes
2467           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2468         }
2469       }
2470       // check method attribute length
2471       if (_need_verify) {
2472         guarantee_property(method_attribute_length == calculated_attribute_length,
2473                            "Code segment has wrong length in class file %s",
2474                            CHECK_NULL);
2475       }
2476     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2477       // Parse Exceptions attribute
2478       if (parsed_checked_exceptions_attribute) {
2479         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2480                               THREAD);
2481         return nullptr;
2482       }
2483       parsed_checked_exceptions_attribute = true;
2484       checked_exceptions_start =
2485             parse_checked_exceptions(cfs,
2486                                      &checked_exceptions_length,
2487                                      method_attribute_length,
2488                                      CHECK_NULL);
2489     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2490       // reject multiple method parameters
2491       if (method_parameters_seen) {
2492         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2493                               THREAD);
2494         return nullptr;
2495       }
2496       method_parameters_seen = true;
2497       method_parameters_length = cfs->get_u1_fast();
2498       const u4 real_length = (method_parameters_length * 4u) + 1u;
2499       if (method_attribute_length != real_length) {
2500         classfile_parse_error(
2501           "Invalid MethodParameters method attribute length %u in class file",
2502           method_attribute_length, THREAD);
2503         return nullptr;
2504       }
2505       method_parameters_data = cfs->current();
2506       cfs->skip_u2_fast(method_parameters_length);
2507       cfs->skip_u2_fast(method_parameters_length);
2508       // ignore this attribute if it cannot be reflected
2509       if (!vmClasses::Parameter_klass_loaded())
2510         method_parameters_length = -1;
2511     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2512       if (method_attribute_length != 0) {
2513         classfile_parse_error(
2514           "Invalid Synthetic method attribute length %u in class file %s",
2515           method_attribute_length, THREAD);
2516         return nullptr;
2517       }
2518       // Should we check that there hasn't already been a synthetic attribute?
2519       access_flags.set_is_synthetic();
2520     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2521       if (method_attribute_length != 0) {
2522         classfile_parse_error(
2523           "Invalid Deprecated method attribute length %u in class file %s",
2524           method_attribute_length, THREAD);
2525         return nullptr;
2526       }
2527     } else if (_major_version >= JAVA_1_5_VERSION) {
2528       if (method_attribute_name == vmSymbols::tag_signature()) {
2529         if (generic_signature_index != 0) {
2530           classfile_parse_error(
2531             "Multiple Signature attributes for method in class file %s",
2532             THREAD);
2533           return nullptr;
2534         }
2535         if (method_attribute_length != 2) {
2536           classfile_parse_error(
2537             "Invalid Signature attribute length %u in class file %s",
2538             method_attribute_length, THREAD);
2539           return nullptr;
2540         }
2541         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2542       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2543         if (runtime_visible_annotations != nullptr) {
2544           classfile_parse_error(
2545             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2546             THREAD);
2547           return nullptr;
2548         }
2549         runtime_visible_annotations_length = method_attribute_length;
2550         runtime_visible_annotations = cfs->current();
2551         assert(runtime_visible_annotations != nullptr, "null visible annotations");
2552         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2553         parse_annotations(cp,
2554                           runtime_visible_annotations,
2555                           runtime_visible_annotations_length,
2556                           &parsed_annotations,
2557                           _loader_data,
2558                           _can_access_vm_annotations);
2559         cfs->skip_u1_fast(runtime_visible_annotations_length);
2560       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2561         if (runtime_invisible_annotations_exists) {
2562           classfile_parse_error(
2563             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2564             THREAD);
2565           return nullptr;
2566         }
2567         runtime_invisible_annotations_exists = true;
2568         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2569       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2570         if (runtime_visible_parameter_annotations != nullptr) {
2571           classfile_parse_error(
2572             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2573             THREAD);
2574           return nullptr;
2575         }
2576         runtime_visible_parameter_annotations_length = method_attribute_length;
2577         runtime_visible_parameter_annotations = cfs->current();
2578         assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2579         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2580       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2581         if (runtime_invisible_parameter_annotations_exists) {
2582           classfile_parse_error(
2583             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2584             THREAD);
2585           return nullptr;
2586         }
2587         runtime_invisible_parameter_annotations_exists = true;
2588         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2589       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2590         if (annotation_default != nullptr) {
2591           classfile_parse_error(
2592             "Multiple AnnotationDefault attributes for method in class file %s",
2593             THREAD);
2594           return nullptr;
2595         }
2596         annotation_default_length = method_attribute_length;
2597         annotation_default = cfs->current();
2598         assert(annotation_default != nullptr, "null annotation default");
2599         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2600       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2601         if (runtime_visible_type_annotations != nullptr) {
2602           classfile_parse_error(
2603             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2604             THREAD);
2605           return nullptr;
2606         }
2607         runtime_visible_type_annotations_length = method_attribute_length;
2608         runtime_visible_type_annotations = cfs->current();
2609         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2610         // No need for the VM to parse Type annotations
2611         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2612       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2613         if (runtime_invisible_type_annotations_exists) {
2614           classfile_parse_error(
2615             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2616             THREAD);
2617           return nullptr;
2618         }
2619         runtime_invisible_type_annotations_exists = true;
2620         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2621       } else {
2622         // Skip unknown attributes
2623         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2624       }
2625     } else {
2626       // Skip unknown attributes
2627       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2628     }
2629   }
2630 
2631   if (linenumber_table != nullptr) {
2632     linenumber_table->write_terminator();
2633     linenumber_table_length = linenumber_table->position();
2634   }
2635 
2636   // Make sure there's at least one Code attribute in non-native/non-abstract method
2637   if (_need_verify) {
2638     guarantee_property(access_flags.is_native() ||
2639                        access_flags.is_abstract() ||
2640                        parsed_code_attribute,
2641                        "Absent Code attribute in method that is not native or abstract in class file %s",
2642                        CHECK_NULL);
2643   }
2644 
2645   // All sizing information for a Method* is finally available, now create it
2646   InlineTableSizes sizes(
2647       total_lvt_length,
2648       linenumber_table_length,
2649       exception_table_length,
2650       checked_exceptions_length,
2651       method_parameters_length,
2652       generic_signature_index,
2653       runtime_visible_annotations_length,
2654       runtime_visible_parameter_annotations_length,
2655       runtime_visible_type_annotations_length,
2656       annotation_default_length,
2657       0);
2658 
2659   Method* const m = Method::allocate(_loader_data,
2660                                      code_length,
2661                                      access_flags,
2662                                      &sizes,
2663                                      ConstMethod::NORMAL,
2664                                      _cp->symbol_at(name_index),
2665                                      CHECK_NULL);
2666 
2667   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2668 
2669   // Fill in information from fixed part (access_flags already set)
2670   m->set_constants(_cp);
2671   m->set_name_index(name_index);
2672   m->set_signature_index(signature_index);
2673   m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2674   assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2675 
2676   // Fill in code attribute information
2677   m->set_max_stack(max_stack);
2678   m->set_max_locals(max_locals);
2679   if (stackmap_data != nullptr) {
2680     m->constMethod()->copy_stackmap_data(_loader_data,
2681                                          (u1*)stackmap_data,
2682                                          stackmap_data_length,
2683                                          CHECK_NULL);
2684   }
2685 
2686   // Copy byte codes
2687   m->set_code((u1*)code_start);
2688 
2689   // Copy line number table
2690   if (linenumber_table != nullptr) {
2691     memcpy(m->compressed_linenumber_table(),
2692            linenumber_table->buffer(),
2693            linenumber_table_length);
2694   }
2695 
2696   // Copy exception table
2697   if (exception_table_length > 0) {
2698     Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2699                                                 m->exception_table_start(),
2700                                                 exception_table_length * sizeof(ExceptionTableElement),
2701                                                 sizeof(u2));
2702   }
2703 
2704   // Copy method parameters
2705   if (method_parameters_length > 0) {
2706     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2707     for (int i = 0; i < method_parameters_length; i++) {
2708       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2709       method_parameters_data += 2;
2710       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2711       method_parameters_data += 2;
2712     }
2713   }
2714 
2715   // Copy checked exceptions
2716   if (checked_exceptions_length > 0) {
2717     Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2718                                                 m->checked_exceptions_start(),
2719                                                 checked_exceptions_length * sizeof(CheckedExceptionElement),
2720                                                 sizeof(u2));
2721   }
2722 
2723   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2724   if (total_lvt_length > 0) {
2725     *has_localvariable_table = true;
2726     copy_localvariable_table(m->constMethod(),
2727                              lvt_cnt,
2728                              localvariable_table_length,
2729                              localvariable_table_start,
2730                              lvtt_cnt,
2731                              localvariable_type_table_length,
2732                              localvariable_type_table_start,
2733                              CHECK_NULL);
2734   }
2735 
2736   if (parsed_annotations.has_any_annotations())
2737     parsed_annotations.apply_to(methodHandle(THREAD, m));
2738 
2739   if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2740     m->set_is_hidden();
2741   }
2742 
2743   // Copy annotations
2744   copy_method_annotations(m->constMethod(),
2745                           runtime_visible_annotations,
2746                           runtime_visible_annotations_length,
2747                           runtime_visible_parameter_annotations,
2748                           runtime_visible_parameter_annotations_length,
2749                           runtime_visible_type_annotations,
2750                           runtime_visible_type_annotations_length,
2751                           annotation_default,
2752                           annotation_default_length,
2753                           CHECK_NULL);
2754 
2755   if (InstanceKlass::is_finalization_enabled() &&
2756       name == vmSymbols::finalize_method_name() &&
2757       signature == vmSymbols::void_method_signature()) {
2758     if (m->is_empty_method()) {
2759       _has_empty_finalizer = true;
2760     } else {
2761       _has_finalizer = true;
2762     }
2763   }
2764 
2765   NOT_PRODUCT(m->verify());
2766   return m;
2767 }
2768 
2769 
2770 // Side-effects: populates the _methods field in the parser
2771 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2772                                     bool is_interface,
2773                                     bool is_value_class,
2774                                     bool is_abstract_type,
2775                                     bool* const has_localvariable_table,
2776                                     bool* has_final_method,
2777                                     bool* declares_nonstatic_concrete_methods,
2778                                     TRAPS) {
2779   assert(cfs != nullptr, "invariant");
2780   assert(has_localvariable_table != nullptr, "invariant");
2781   assert(has_final_method != nullptr, "invariant");
2782   assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2783 
2784   assert(nullptr == _methods, "invariant");
2785 
2786   cfs->guarantee_more(2, CHECK);  // length
2787   const u2 length = cfs->get_u2_fast();
2788   if (length == 0) {
2789     _methods = Universe::the_empty_method_array();
2790   } else {
2791     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2792                                                    length,
2793                                                    nullptr,
2794                                                    CHECK);
2795 
2796     for (int index = 0; index < length; index++) {
2797       Method* method = parse_method(cfs,
2798                                     is_interface,
2799                                     is_value_class,
2800                                     is_abstract_type,
2801                                     _cp,
2802                                     has_localvariable_table,
2803                                     CHECK);
2804 
2805       if (method->is_final()) {
2806         *has_final_method = true;
2807       }
2808       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2809       // used for interface initialization, and default method inheritance analysis
2810       if (is_interface && !(*declares_nonstatic_concrete_methods)
2811         && !method->is_abstract() && !method->is_static()) {
2812         *declares_nonstatic_concrete_methods = true;
2813       }
2814       _methods->at_put(index, method);
2815     }
2816 
2817     if (_need_verify && length > 1) {
2818       // Check duplicated methods
2819       ResourceMark rm(THREAD);
2820       // Set containing name-signature pairs
2821       NameSigHashtable* names_and_sigs = new NameSigHashtable();
2822       for (int i = 0; i < length; i++) {
2823         const Method* const m = _methods->at(i);
2824         NameSigHash name_and_sig(m->name(), m->signature());
2825         // If no duplicates, add name/signature in hashtable names_and_sigs.
2826         if(!names_and_sigs->put(name_and_sig, 0)) {
2827           classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2828                                  name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2829           return;
2830         }
2831       }
2832     }
2833   }
2834 }
2835 
2836 static const intArray* sort_methods(Array<Method*>* methods) {
2837   const int length = methods->length();
2838   // If JVMTI original method ordering or sharing is enabled we have to
2839   // remember the original class file ordering.
2840   // We temporarily use the vtable_index field in the Method* to store the
2841   // class file index, so we can read in after calling qsort.
2842   // Put the method ordering in the shared archive.
2843   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2844     for (int index = 0; index < length; index++) {
2845       Method* const m = methods->at(index);
2846       assert(!m->valid_vtable_index(), "vtable index should not be set");
2847       m->set_vtable_index(index);
2848     }
2849   }
2850   // Sort method array by ascending method name (for faster lookups & vtable construction)
2851   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2852   Method::sort_methods(methods);
2853 
2854   intArray* method_ordering = nullptr;
2855   // If JVMTI original method ordering or sharing is enabled construct int
2856   // array remembering the original ordering
2857   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2858     method_ordering = new intArray(length, length, -1);
2859     for (int index = 0; index < length; index++) {
2860       Method* const m = methods->at(index);
2861       const int old_index = m->vtable_index();
2862       assert(old_index >= 0 && old_index < length, "invalid method index");
2863       method_ordering->at_put(index, old_index);
2864       m->set_vtable_index(Method::invalid_vtable_index);
2865     }
2866   }
2867   return method_ordering;
2868 }
2869 
2870 // Parse generic_signature attribute for methods and fields
2871 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2872                                                       TRAPS) {
2873   assert(cfs != nullptr, "invariant");
2874 
2875   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2876   const u2 generic_signature_index = cfs->get_u2_fast();
2877   guarantee_property(
2878     valid_symbol_at(generic_signature_index),
2879     "Invalid Signature attribute at constant pool index %u in class file %s",
2880     generic_signature_index, CHECK_0);
2881   return generic_signature_index;
2882 }
2883 
2884 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2885                                                            TRAPS) {
2886 
2887   assert(cfs != nullptr, "invariant");
2888 
2889   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2890   const u2 sourcefile_index = cfs->get_u2_fast();
2891   guarantee_property(
2892     valid_symbol_at(sourcefile_index),
2893     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2894     sourcefile_index, CHECK);
2895   set_class_sourcefile_index(sourcefile_index);
2896 }
2897 
2898 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2899                                                                        int length,
2900                                                                        TRAPS) {
2901   assert(cfs != nullptr, "invariant");
2902 
2903   const u1* const sde_buffer = cfs->current();
2904   assert(sde_buffer != nullptr, "null sde buffer");
2905 
2906   // Don't bother storing it if there is no way to retrieve it
2907   if (JvmtiExport::can_get_source_debug_extension()) {
2908     assert((length+1) > length, "Overflow checking");
2909     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2910     for (int i = 0; i < length; i++) {
2911       sde[i] = sde_buffer[i];
2912     }
2913     sde[length] = '\0';
2914     set_class_sde_buffer((const char*)sde, length);
2915   }
2916   // Got utf8 string, set stream position forward
2917   cfs->skip_u1(length, CHECK);
2918 }
2919 
2920 
2921 // Inner classes can be static, private or protected (classic VM does this)
2922 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2923                                            JVM_ACC_PRIVATE |                \
2924                                            JVM_ACC_PROTECTED |              \
2925                                            JVM_ACC_STATIC                   \
2926                                          )
2927 
2928 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2929 // Return -1 if none is found.
2930 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2931   Symbol* cp_klass_name =  cp->klass_name_at(inner);
2932   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2933     int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2934     if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2935       return idx;
2936     }
2937   }
2938   return -1;
2939 }
2940 
2941 // Return the outer_class_info_index for the InnerClasses entry containing the
2942 // specified inner_class_info_index.  Return -1 if no InnerClasses entry is found.
2943 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2944   if (inner == 0) return -1;
2945   int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2946   if (idx == -1) return -1;
2947   int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2948   return result;
2949 }
2950 
2951 // Return true if circularity is found, false if no circularity is found.
2952 // Use Floyd's cycle finding algorithm.
2953 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2954   int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2955   int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2956 
2957   while (fast != -1 && fast != 0) {
2958     if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2959       return true;  // found a circularity
2960     }
2961     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2962     if (fast == -1) return false;
2963     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
2964     if (fast == -1) return false;
2965     slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
2966     assert(slow != -1, "sanity check");
2967   }
2968   return false;
2969 }
2970 
2971 // Loop through each InnerClasses entry checking for circularities and duplications
2972 // with other entries.  If duplicate entries are found then throw CFE.  Otherwise,
2973 // return true if a circularity or entries with duplicate inner_class_info_indexes
2974 // are found.
2975 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
2976   // Loop through each InnerClasses entry.
2977   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2978     // Return true if there are circular entries.
2979     if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
2980       return true;
2981     }
2982     // Check if there are duplicate entries or entries with the same inner_class_info_index.
2983     for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
2984          y += InstanceKlass::inner_class_next_offset) {
2985 
2986       // 4347400: make sure there's no duplicate entry in the classes array
2987       if (_major_version >= JAVA_1_5_VERSION) {
2988         guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
2989                             _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
2990                             _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
2991                             _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
2992                            "Duplicate entry in InnerClasses attribute in class file %s",
2993                            CHECK_(true));
2994       }
2995       // Return true if there are two entries with the same inner_class_info_index.
2996       if (_inner_classes->at(y) == _inner_classes->at(idx)) {
2997         return true;
2998       }
2999     }
3000   }
3001   return false;
3002 }
3003 
3004 // Return number of classes in the inner classes attribute table
3005 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3006                                                             const ConstantPool* cp,
3007                                                             const u1* const inner_classes_attribute_start,
3008                                                             bool parsed_enclosingmethod_attribute,
3009                                                             u2 enclosing_method_class_index,
3010                                                             u2 enclosing_method_method_index,
3011                                                             TRAPS) {
3012   const u1* const current_mark = cfs->current();
3013   u2 length = 0;
3014   if (inner_classes_attribute_start != nullptr) {
3015     cfs->set_current(inner_classes_attribute_start);
3016     cfs->guarantee_more(2, CHECK_0);  // length
3017     length = cfs->get_u2_fast();
3018   }
3019 
3020   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3021   // method data:
3022   //   [inner_class_info_index,
3023   //    outer_class_info_index,
3024   //    inner_name_index,
3025   //    inner_class_access_flags,
3026   //    ...
3027   //    enclosing_method_class_index,
3028   //    enclosing_method_method_index]
3029   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3030   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3031   _inner_classes = inner_classes;
3032 
3033   int index = 0;
3034   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
3035   for (int n = 0; n < length; n++) {
3036     // Inner class index
3037     const u2 inner_class_info_index = cfs->get_u2_fast();
3038     guarantee_property(
3039       valid_klass_reference_at(inner_class_info_index),
3040       "inner_class_info_index %u has bad constant type in class file %s",
3041       inner_class_info_index, CHECK_0);
3042     // Outer class index
3043     const u2 outer_class_info_index = cfs->get_u2_fast();
3044     guarantee_property(
3045       outer_class_info_index == 0 ||
3046         valid_klass_reference_at(outer_class_info_index),
3047       "outer_class_info_index %u has bad constant type in class file %s",
3048       outer_class_info_index, CHECK_0);
3049 
3050     if (outer_class_info_index != 0) {
3051       const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3052       char* bytes = (char*)outer_class_name->bytes();
3053       guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3054                          "Outer class is an array class in class file %s", CHECK_0);
3055     }
3056     // Inner class name
3057     const u2 inner_name_index = cfs->get_u2_fast();
3058     guarantee_property(
3059       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3060       "inner_name_index %u has bad constant type in class file %s",
3061       inner_name_index, CHECK_0);
3062     if (_need_verify) {
3063       guarantee_property(inner_class_info_index != outer_class_info_index,
3064                          "Class is both outer and inner class in class file %s", CHECK_0);
3065     }
3066 
3067     u2 recognized_modifiers = RECOGNIZED_INNER_CLASS_MODIFIERS;
3068     // JVM_ACC_MODULE is defined in JDK-9 and later.
3069     if (_major_version >= JAVA_9_VERSION) {
3070       recognized_modifiers |= JVM_ACC_MODULE;
3071     }
3072 
3073     // Access flags
3074     u2 flags = cfs->get_u2_fast() & recognized_modifiers;
3075 
3076     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3077       // Set abstract bit for old class files for backward compatibility
3078       flags |= JVM_ACC_ABSTRACT;
3079     }
3080 
3081     if (!supports_inline_types()) {
3082       const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3083       const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3084       if (!is_module && !is_interface) {
3085         flags |= JVM_ACC_IDENTITY;
3086       }
3087     }
3088 
3089     const char* name = inner_name_index == 0 ? "unnamed" : cp->symbol_at(inner_name_index)->as_utf8();
3090     verify_legal_class_modifiers(flags, name, false, CHECK_0);
3091     AccessFlags inner_access_flags(flags);
3092 
3093     inner_classes->at_put(index++, inner_class_info_index);
3094     inner_classes->at_put(index++, outer_class_info_index);
3095     inner_classes->at_put(index++, inner_name_index);
3096     inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3097   }
3098 
3099   // Check for circular and duplicate entries.
3100   bool has_circularity = false;
3101   if (_need_verify) {
3102     has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3103     if (has_circularity) {
3104       // If circularity check failed then ignore InnerClasses attribute.
3105       MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3106       index = 0;
3107       if (parsed_enclosingmethod_attribute) {
3108         inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3109         _inner_classes = inner_classes;
3110       } else {
3111         _inner_classes = Universe::the_empty_short_array();
3112       }
3113     }
3114   }
3115   // Set EnclosingMethod class and method indexes.
3116   if (parsed_enclosingmethod_attribute) {
3117     inner_classes->at_put(index++, enclosing_method_class_index);
3118     inner_classes->at_put(index++, enclosing_method_method_index);
3119   }
3120   assert(index == size || has_circularity, "wrong size");
3121 
3122   // Restore buffer's current position.
3123   cfs->set_current(current_mark);
3124 
3125   return length;
3126 }
3127 
3128 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3129                                                            const u1* const nest_members_attribute_start,
3130                                                            TRAPS) {
3131   const u1* const current_mark = cfs->current();
3132   u2 length = 0;
3133   if (nest_members_attribute_start != nullptr) {
3134     cfs->set_current(nest_members_attribute_start);
3135     cfs->guarantee_more(2, CHECK_0);  // length
3136     length = cfs->get_u2_fast();
3137   }
3138   const int size = length;
3139   Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3140   _nest_members = nest_members;
3141 
3142   int index = 0;
3143   cfs->guarantee_more(2 * length, CHECK_0);
3144   for (int n = 0; n < length; n++) {
3145     const u2 class_info_index = cfs->get_u2_fast();
3146     guarantee_property(
3147       valid_klass_reference_at(class_info_index),
3148       "Nest member class_info_index %u has bad constant type in class file %s",
3149       class_info_index, CHECK_0);
3150     nest_members->at_put(index++, class_info_index);
3151   }
3152   assert(index == size, "wrong size");
3153 
3154   // Restore buffer's current position.
3155   cfs->set_current(current_mark);
3156 
3157   return length;
3158 }
3159 
3160 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3161                                                                    const u1* const permitted_subclasses_attribute_start,
3162                                                                    TRAPS) {
3163   const u1* const current_mark = cfs->current();
3164   u2 length = 0;
3165   if (permitted_subclasses_attribute_start != nullptr) {
3166     cfs->set_current(permitted_subclasses_attribute_start);
3167     cfs->guarantee_more(2, CHECK_0);  // length
3168     length = cfs->get_u2_fast();
3169   }
3170   const int size = length;
3171   Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3172   _permitted_subclasses = permitted_subclasses;
3173 
3174   if (length > 0) {
3175     int index = 0;
3176     cfs->guarantee_more(2 * length, CHECK_0);
3177     for (int n = 0; n < length; n++) {
3178       const u2 class_info_index = cfs->get_u2_fast();
3179       guarantee_property(
3180         valid_klass_reference_at(class_info_index),
3181         "Permitted subclass class_info_index %u has bad constant type in class file %s",
3182         class_info_index, CHECK_0);
3183       permitted_subclasses->at_put(index++, class_info_index);
3184     }
3185     assert(index == size, "wrong size");
3186   }
3187 
3188   // Restore buffer's current position.
3189   cfs->set_current(current_mark);
3190 
3191   return length;
3192 }
3193 
3194 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3195                                                                    const u1* const loadable_descriptors_attribute_start,
3196                                                                    TRAPS) {
3197   const u1* const current_mark = cfs->current();
3198   u2 length = 0;
3199   if (loadable_descriptors_attribute_start != nullptr) {
3200     cfs->set_current(loadable_descriptors_attribute_start);
3201     cfs->guarantee_more(2, CHECK_0);  // length
3202     length = cfs->get_u2_fast();
3203   }
3204   const int size = length;
3205   Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3206   _loadable_descriptors = loadable_descriptors;
3207   if (length > 0) {
3208     int index = 0;
3209     cfs->guarantee_more(2 * length, CHECK_0);
3210     for (int n = 0; n < length; n++) {
3211       const u2 descriptor_index = cfs->get_u2_fast();
3212       guarantee_property(
3213         valid_symbol_at(descriptor_index),
3214         "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3215         descriptor_index, CHECK_0);
3216       Symbol* descriptor = _cp->symbol_at(descriptor_index);
3217       bool valid = legal_field_signature(descriptor, CHECK_0);
3218       if(!valid) {
3219         ResourceMark rm(THREAD);
3220         Exceptions::fthrow(THREAD_AND_LOCATION,
3221           vmSymbols::java_lang_ClassFormatError(),
3222           "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3223           descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3224         return 0;
3225       }
3226       loadable_descriptors->at_put(index++, descriptor_index);
3227     }
3228     assert(index == size, "wrong size");
3229   }
3230 
3231   // Restore buffer's current position.
3232   cfs->set_current(current_mark);
3233 
3234   return length;
3235 }
3236 
3237 //  Record {
3238 //    u2 attribute_name_index;
3239 //    u4 attribute_length;
3240 //    u2 components_count;
3241 //    component_info components[components_count];
3242 //  }
3243 //  component_info {
3244 //    u2 name_index;
3245 //    u2 descriptor_index
3246 //    u2 attributes_count;
3247 //    attribute_info_attributes[attributes_count];
3248 //  }
3249 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3250                                                      const ConstantPool* cp,
3251                                                      const u1* const record_attribute_start,
3252                                                      TRAPS) {
3253   const u1* const current_mark = cfs->current();
3254   int components_count = 0;
3255   unsigned int calculate_attr_size = 0;
3256   if (record_attribute_start != nullptr) {
3257     cfs->set_current(record_attribute_start);
3258     cfs->guarantee_more(2, CHECK_0);  // num of components
3259     components_count = (int)cfs->get_u2_fast();
3260     calculate_attr_size = 2;
3261   }
3262 
3263   Array<RecordComponent*>* const record_components =
3264     MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3265   _record_components = record_components;
3266 
3267   for (int x = 0; x < components_count; x++) {
3268     cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3269 
3270     const u2 name_index = cfs->get_u2_fast();
3271     guarantee_property(valid_symbol_at(name_index),
3272       "Invalid constant pool index %u for name in Record attribute in class file %s",
3273       name_index, CHECK_0);
3274     const Symbol* const name = cp->symbol_at(name_index);
3275     verify_legal_field_name(name, CHECK_0);
3276 
3277     const u2 descriptor_index = cfs->get_u2_fast();
3278     guarantee_property(valid_symbol_at(descriptor_index),
3279       "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3280       descriptor_index, CHECK_0);
3281     const Symbol* const descr = cp->symbol_at(descriptor_index);
3282     verify_legal_field_signature(name, descr, CHECK_0);
3283 
3284     const u2 attributes_count = cfs->get_u2_fast();
3285     calculate_attr_size += 6;
3286     u2 generic_sig_index = 0;
3287     const u1* runtime_visible_annotations = nullptr;
3288     int runtime_visible_annotations_length = 0;
3289     bool runtime_invisible_annotations_exists = false;
3290     const u1* runtime_visible_type_annotations = nullptr;
3291     int runtime_visible_type_annotations_length = 0;
3292     bool runtime_invisible_type_annotations_exists = false;
3293 
3294     // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3295     // and Runtime(In)VisibleTypeAnnotations.  Other attributes are ignored.
3296     for (int y = 0; y < attributes_count; y++) {
3297       cfs->guarantee_more(6, CHECK_0);  // attribute_name_index, attribute_length
3298       const u2 attribute_name_index = cfs->get_u2_fast();
3299       const u4 attribute_length = cfs->get_u4_fast();
3300       calculate_attr_size += 6;
3301       guarantee_property(
3302         valid_symbol_at(attribute_name_index),
3303         "Invalid Record attribute name index %u in class file %s",
3304         attribute_name_index, CHECK_0);
3305 
3306       const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3307       if (attribute_name == vmSymbols::tag_signature()) {
3308         if (generic_sig_index != 0) {
3309           classfile_parse_error(
3310             "Multiple Signature attributes for Record component in class file %s",
3311             THREAD);
3312           return 0;
3313         }
3314         if (attribute_length != 2) {
3315           classfile_parse_error(
3316             "Invalid Signature attribute length %u in Record component in class file %s",
3317             attribute_length, THREAD);
3318           return 0;
3319         }
3320         generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3321 
3322       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3323         if (runtime_visible_annotations != nullptr) {
3324           classfile_parse_error(
3325             "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3326           return 0;
3327         }
3328         runtime_visible_annotations_length = attribute_length;
3329         runtime_visible_annotations = cfs->current();
3330 
3331         assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3332         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3333         cfs->skip_u1_fast(runtime_visible_annotations_length);
3334 
3335       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3336         if (runtime_invisible_annotations_exists) {
3337           classfile_parse_error(
3338             "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3339           return 0;
3340         }
3341         runtime_invisible_annotations_exists = true;
3342         cfs->skip_u1(attribute_length, CHECK_0);
3343 
3344       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3345         if (runtime_visible_type_annotations != nullptr) {
3346           classfile_parse_error(
3347             "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3348           return 0;
3349         }
3350         runtime_visible_type_annotations_length = attribute_length;
3351         runtime_visible_type_annotations = cfs->current();
3352 
3353         assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3354         cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3355         cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3356 
3357       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3358         if (runtime_invisible_type_annotations_exists) {
3359           classfile_parse_error(
3360             "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3361           return 0;
3362         }
3363         runtime_invisible_type_annotations_exists = true;
3364         cfs->skip_u1(attribute_length, CHECK_0);
3365 
3366       } else {
3367         // Skip unknown attributes
3368         cfs->skip_u1(attribute_length, CHECK_0);
3369       }
3370       calculate_attr_size += attribute_length;
3371     } // End of attributes For loop
3372 
3373     AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3374                                                         runtime_visible_annotations_length,
3375                                                         CHECK_0);
3376     AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3377                                                              runtime_visible_type_annotations_length,
3378                                                              CHECK_0);
3379 
3380     RecordComponent* record_component =
3381       RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3382                                 annotations, type_annotations, CHECK_0);
3383     record_components->at_put(x, record_component);
3384   }  // End of component processing loop
3385 
3386   // Restore buffer's current position.
3387   cfs->set_current(current_mark);
3388   return calculate_attr_size;
3389 }
3390 
3391 void ClassFileParser::parse_classfile_synthetic_attribute() {
3392   set_class_synthetic_flag(true);
3393 }
3394 
3395 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3396   assert(cfs != nullptr, "invariant");
3397 
3398   const u2 signature_index = cfs->get_u2(CHECK);
3399   guarantee_property(
3400     valid_symbol_at(signature_index),
3401     "Invalid constant pool index %u in Signature attribute in class file %s",
3402     signature_index, CHECK);
3403   set_class_generic_signature_index(signature_index);
3404 }
3405 
3406 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3407                                                                   ConstantPool* cp,
3408                                                                   u4 attribute_byte_length,
3409                                                                   TRAPS) {
3410   assert(cfs != nullptr, "invariant");
3411   assert(cp != nullptr, "invariant");
3412 
3413   const u1* const current_start = cfs->current();
3414 
3415   guarantee_property(attribute_byte_length >= sizeof(u2),
3416                      "Invalid BootstrapMethods attribute length %u in class file %s",
3417                      attribute_byte_length,
3418                      CHECK);
3419 
3420   cfs->guarantee_more(attribute_byte_length, CHECK);
3421 
3422   const int attribute_array_length = cfs->get_u2_fast();
3423 
3424   guarantee_property(_max_bootstrap_specifier_index < attribute_array_length,
3425                      "Short length on BootstrapMethods in class file %s",
3426                      CHECK);
3427 
3428 
3429   // The attribute contains a counted array of counted tuples of shorts,
3430   // represending bootstrap specifiers:
3431   //    length*{bootstrap_method_index, argument_count*{argument_index}}
3432   const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2);
3433   // operand_count = number of shorts in attr, except for leading length
3434 
3435   // The attribute is copied into a short[] array.
3436   // The array begins with a series of short[2] pairs, one for each tuple.
3437   const int index_size = (attribute_array_length * 2);
3438 
3439   Array<u2>* const operands =
3440     MetadataFactory::new_array<u2>(_loader_data, index_size + operand_count, CHECK);
3441 
3442   // Eagerly assign operands so they will be deallocated with the constant
3443   // pool if there is an error.
3444   cp->set_operands(operands);
3445 
3446   int operand_fill_index = index_size;
3447   const int cp_size = cp->length();
3448 
3449   for (int n = 0; n < attribute_array_length; n++) {
3450     // Store a 32-bit offset into the header of the operand array.
3451     ConstantPool::operand_offset_at_put(operands, n, operand_fill_index);
3452 
3453     // Read a bootstrap specifier.
3454     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3455     const u2 bootstrap_method_index = cfs->get_u2_fast();
3456     const u2 argument_count = cfs->get_u2_fast();
3457     guarantee_property(
3458       valid_cp_range(bootstrap_method_index, cp_size) &&
3459       cp->tag_at(bootstrap_method_index).is_method_handle(),
3460       "bootstrap_method_index %u has bad constant type in class file %s",
3461       bootstrap_method_index,
3462       CHECK);
3463 
3464     guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(),
3465       "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s",
3466       CHECK);
3467 
3468     operands->at_put(operand_fill_index++, bootstrap_method_index);
3469     operands->at_put(operand_fill_index++, argument_count);
3470 
3471     cfs->guarantee_more(sizeof(u2) * argument_count, CHECK);  // argv[argc]
3472     for (int j = 0; j < argument_count; j++) {
3473       const u2 argument_index = cfs->get_u2_fast();
3474       guarantee_property(
3475         valid_cp_range(argument_index, cp_size) &&
3476         cp->tag_at(argument_index).is_loadable_constant(),
3477         "argument_index %u has bad constant type in class file %s",
3478         argument_index,
3479         CHECK);
3480       operands->at_put(operand_fill_index++, argument_index);
3481     }
3482   }
3483   guarantee_property(current_start + attribute_byte_length == cfs->current(),
3484                      "Bad length on BootstrapMethods in class file %s",
3485                      CHECK);
3486 }
3487 
3488 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3489                                                  ConstantPool* cp,
3490                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3491                                                  TRAPS) {
3492   assert(cfs != nullptr, "invariant");
3493   assert(cp != nullptr, "invariant");
3494   assert(parsed_annotations != nullptr, "invariant");
3495 
3496   // Set inner classes attribute to default sentinel
3497   _inner_classes = Universe::the_empty_short_array();
3498   // Set nest members attribute to default sentinel
3499   _nest_members = Universe::the_empty_short_array();
3500   // Set _permitted_subclasses attribute to default sentinel
3501   _permitted_subclasses = Universe::the_empty_short_array();
3502   // Set _loadable_descriptors attribute to default sentinel
3503   _loadable_descriptors = Universe::the_empty_short_array();
3504   cfs->guarantee_more(2, CHECK);  // attributes_count
3505   u2 attributes_count = cfs->get_u2_fast();
3506   bool parsed_sourcefile_attribute = false;
3507   bool parsed_innerclasses_attribute = false;
3508   bool parsed_nest_members_attribute = false;
3509   bool parsed_permitted_subclasses_attribute = false;
3510   bool parsed_loadable_descriptors_attribute = false;
3511   bool parsed_nest_host_attribute = false;
3512   bool parsed_record_attribute = false;
3513   bool parsed_enclosingmethod_attribute = false;
3514   bool parsed_bootstrap_methods_attribute = false;
3515   const u1* runtime_visible_annotations = nullptr;
3516   int runtime_visible_annotations_length = 0;
3517   const u1* runtime_visible_type_annotations = nullptr;
3518   int runtime_visible_type_annotations_length = 0;
3519   bool runtime_invisible_type_annotations_exists = false;
3520   bool runtime_invisible_annotations_exists = false;
3521   bool parsed_source_debug_ext_annotations_exist = false;
3522   const u1* inner_classes_attribute_start = nullptr;
3523   u4  inner_classes_attribute_length = 0;
3524   u2  enclosing_method_class_index = 0;
3525   u2  enclosing_method_method_index = 0;
3526   const u1* nest_members_attribute_start = nullptr;
3527   u4  nest_members_attribute_length = 0;
3528   const u1* record_attribute_start = nullptr;
3529   u4  record_attribute_length = 0;
3530   const u1* permitted_subclasses_attribute_start = nullptr;
3531   u4  permitted_subclasses_attribute_length = 0;
3532   const u1* loadable_descriptors_attribute_start = nullptr;
3533   u4  loadable_descriptors_attribute_length = 0;
3534 
3535   // Iterate over attributes
3536   while (attributes_count--) {
3537     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3538     const u2 attribute_name_index = cfs->get_u2_fast();
3539     const u4 attribute_length = cfs->get_u4_fast();
3540     guarantee_property(
3541       valid_symbol_at(attribute_name_index),
3542       "Attribute name has bad constant pool index %u in class file %s",
3543       attribute_name_index, CHECK);
3544     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3545     if (tag == vmSymbols::tag_source_file()) {
3546       // Check for SourceFile tag
3547       if (_need_verify) {
3548         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3549       }
3550       if (parsed_sourcefile_attribute) {
3551         classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3552         return;
3553       } else {
3554         parsed_sourcefile_attribute = true;
3555       }
3556       parse_classfile_sourcefile_attribute(cfs, CHECK);
3557     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3558       // Check for SourceDebugExtension tag
3559       if (parsed_source_debug_ext_annotations_exist) {
3560         classfile_parse_error(
3561           "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3562         return;
3563       }
3564       parsed_source_debug_ext_annotations_exist = true;
3565       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3566     } else if (tag == vmSymbols::tag_inner_classes()) {
3567       // Check for InnerClasses tag
3568       if (parsed_innerclasses_attribute) {
3569         classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3570         return;
3571       } else {
3572         parsed_innerclasses_attribute = true;
3573       }
3574       inner_classes_attribute_start = cfs->current();
3575       inner_classes_attribute_length = attribute_length;
3576       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3577     } else if (tag == vmSymbols::tag_synthetic()) {
3578       // Check for Synthetic tag
3579       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3580       if (attribute_length != 0) {
3581         classfile_parse_error(
3582           "Invalid Synthetic classfile attribute length %u in class file %s",
3583           attribute_length, THREAD);
3584         return;
3585       }
3586       parse_classfile_synthetic_attribute();
3587     } else if (tag == vmSymbols::tag_deprecated()) {
3588       // Check for Deprecated tag - 4276120
3589       if (attribute_length != 0) {
3590         classfile_parse_error(
3591           "Invalid Deprecated classfile attribute length %u in class file %s",
3592           attribute_length, THREAD);
3593         return;
3594       }
3595     } else if (_major_version >= JAVA_1_5_VERSION) {
3596       if (tag == vmSymbols::tag_signature()) {
3597         if (_generic_signature_index != 0) {
3598           classfile_parse_error(
3599             "Multiple Signature attributes in class file %s", THREAD);
3600           return;
3601         }
3602         if (attribute_length != 2) {
3603           classfile_parse_error(
3604             "Wrong Signature attribute length %u in class file %s",
3605             attribute_length, THREAD);
3606           return;
3607         }
3608         parse_classfile_signature_attribute(cfs, CHECK);
3609       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3610         if (runtime_visible_annotations != nullptr) {
3611           classfile_parse_error(
3612             "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3613           return;
3614         }
3615         runtime_visible_annotations_length = attribute_length;
3616         runtime_visible_annotations = cfs->current();
3617         assert(runtime_visible_annotations != nullptr, "null visible annotations");
3618         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3619         parse_annotations(cp,
3620                           runtime_visible_annotations,
3621                           runtime_visible_annotations_length,
3622                           parsed_annotations,
3623                           _loader_data,
3624                           _can_access_vm_annotations);
3625         cfs->skip_u1_fast(runtime_visible_annotations_length);
3626       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3627         if (runtime_invisible_annotations_exists) {
3628           classfile_parse_error(
3629             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3630           return;
3631         }
3632         runtime_invisible_annotations_exists = true;
3633         cfs->skip_u1(attribute_length, CHECK);
3634       } else if (tag == vmSymbols::tag_enclosing_method()) {
3635         if (parsed_enclosingmethod_attribute) {
3636           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3637           return;
3638         } else {
3639           parsed_enclosingmethod_attribute = true;
3640         }
3641         guarantee_property(attribute_length == 4,
3642           "Wrong EnclosingMethod attribute length %u in class file %s",
3643           attribute_length, CHECK);
3644         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3645         enclosing_method_class_index  = cfs->get_u2_fast();
3646         enclosing_method_method_index = cfs->get_u2_fast();
3647         if (enclosing_method_class_index == 0) {
3648           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3649           return;
3650         }
3651         // Validate the constant pool indices and types
3652         guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3653           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3654         if (enclosing_method_method_index != 0 &&
3655             (!cp->is_within_bounds(enclosing_method_method_index) ||
3656              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3657           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3658           return;
3659         }
3660       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3661                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3662         if (parsed_bootstrap_methods_attribute) {
3663           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3664           return;
3665         }
3666         parsed_bootstrap_methods_attribute = true;
3667         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3668       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3669         if (runtime_visible_type_annotations != nullptr) {
3670           classfile_parse_error(
3671             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3672           return;
3673         }
3674         runtime_visible_type_annotations_length = attribute_length;
3675         runtime_visible_type_annotations = cfs->current();
3676         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3677         // No need for the VM to parse Type annotations
3678         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3679       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3680         if (runtime_invisible_type_annotations_exists) {
3681           classfile_parse_error(
3682             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3683           return;
3684         }
3685         runtime_invisible_type_annotations_exists = true;
3686         cfs->skip_u1(attribute_length, CHECK);
3687       } else if (_major_version >= JAVA_11_VERSION) {
3688         if (tag == vmSymbols::tag_nest_members()) {
3689           // Check for NestMembers tag
3690           if (parsed_nest_members_attribute) {
3691             classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3692             return;
3693           } else {
3694             parsed_nest_members_attribute = true;
3695           }
3696           if (parsed_nest_host_attribute) {
3697             classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3698             return;
3699           }
3700           nest_members_attribute_start = cfs->current();
3701           nest_members_attribute_length = attribute_length;
3702           cfs->skip_u1(nest_members_attribute_length, CHECK);
3703         } else if (tag == vmSymbols::tag_nest_host()) {
3704           if (parsed_nest_host_attribute) {
3705             classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3706             return;
3707           } else {
3708             parsed_nest_host_attribute = true;
3709           }
3710           if (parsed_nest_members_attribute) {
3711             classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3712             return;
3713           }
3714           if (_need_verify) {
3715             guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3716           }
3717           cfs->guarantee_more(2, CHECK);
3718           u2 class_info_index = cfs->get_u2_fast();
3719           guarantee_property(
3720                          valid_klass_reference_at(class_info_index),
3721                          "Nest-host class_info_index %u has bad constant type in class file %s",
3722                          class_info_index, CHECK);
3723           _nest_host = class_info_index;
3724 
3725         } else if (_major_version >= JAVA_16_VERSION) {
3726           if (tag == vmSymbols::tag_record()) {
3727             if (parsed_record_attribute) {
3728               classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3729               return;
3730             }
3731             parsed_record_attribute = true;
3732             record_attribute_start = cfs->current();
3733             record_attribute_length = attribute_length;
3734           } else if (_major_version >= JAVA_17_VERSION) {
3735             if (tag == vmSymbols::tag_permitted_subclasses()) {
3736               if (parsed_permitted_subclasses_attribute) {
3737                 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3738                 return;
3739               }
3740               // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3741               if (_access_flags.is_final()) {
3742                 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3743                 return;
3744               }
3745               parsed_permitted_subclasses_attribute = true;
3746               permitted_subclasses_attribute_start = cfs->current();
3747               permitted_subclasses_attribute_length = attribute_length;
3748             }
3749             if (EnableValhalla && tag == vmSymbols::tag_loadable_descriptors()) {
3750               if (parsed_loadable_descriptors_attribute) {
3751                 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3752                 return;
3753               }
3754               parsed_loadable_descriptors_attribute = true;
3755               loadable_descriptors_attribute_start = cfs->current();
3756               loadable_descriptors_attribute_length = attribute_length;
3757             }
3758           }
3759           // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3760           cfs->skip_u1(attribute_length, CHECK);
3761         } else {
3762           // Unknown attribute
3763           cfs->skip_u1(attribute_length, CHECK);
3764         }
3765       } else {
3766         // Unknown attribute
3767         cfs->skip_u1(attribute_length, CHECK);
3768       }
3769     } else {
3770       // Unknown attribute
3771       cfs->skip_u1(attribute_length, CHECK);
3772     }
3773   }
3774   _class_annotations = allocate_annotations(runtime_visible_annotations,
3775                                             runtime_visible_annotations_length,
3776                                             CHECK);
3777   _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3778                                                  runtime_visible_type_annotations_length,
3779                                                  CHECK);
3780 
3781   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3782     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3783                             cfs,
3784                             cp,
3785                             inner_classes_attribute_start,
3786                             parsed_innerclasses_attribute,
3787                             enclosing_method_class_index,
3788                             enclosing_method_method_index,
3789                             CHECK);
3790     if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3791       guarantee_property(
3792         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3793         "Wrong InnerClasses attribute length in class file %s", CHECK);
3794     }
3795   }
3796 
3797   if (parsed_nest_members_attribute) {
3798     const u2 num_of_classes = parse_classfile_nest_members_attribute(
3799                             cfs,
3800                             nest_members_attribute_start,
3801                             CHECK);
3802     if (_need_verify) {
3803       guarantee_property(
3804         nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3805         "Wrong NestMembers attribute length in class file %s", CHECK);
3806     }
3807   }
3808 
3809   if (parsed_record_attribute) {
3810     const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3811                             cfs,
3812                             cp,
3813                             record_attribute_start,
3814                             CHECK);
3815     if (_need_verify) {
3816       guarantee_property(record_attribute_length == calculated_attr_length,
3817                          "Record attribute has wrong length in class file %s",
3818                          CHECK);
3819     }
3820   }
3821 
3822   if (parsed_permitted_subclasses_attribute) {
3823     const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3824                             cfs,
3825                             permitted_subclasses_attribute_start,
3826                             CHECK);
3827     if (_need_verify) {
3828       guarantee_property(
3829         permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3830         "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3831     }
3832   }
3833 
3834   if (parsed_loadable_descriptors_attribute) {
3835     const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3836                             cfs,
3837                             loadable_descriptors_attribute_start,
3838                             CHECK);
3839     if (_need_verify) {
3840       guarantee_property(
3841         loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3842         "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3843     }
3844   }
3845 
3846   if (_max_bootstrap_specifier_index >= 0) {
3847     guarantee_property(parsed_bootstrap_methods_attribute,
3848                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3849   }
3850 }
3851 
3852 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3853   assert(k != nullptr, "invariant");
3854 
3855   if (_synthetic_flag)
3856     k->set_is_synthetic();
3857   if (_sourcefile_index != 0) {
3858     k->set_source_file_name_index(_sourcefile_index);
3859   }
3860   if (_generic_signature_index != 0) {
3861     k->set_generic_signature_index(_generic_signature_index);
3862   }
3863   if (_sde_buffer != nullptr) {
3864     k->set_source_debug_extension(_sde_buffer, _sde_length);
3865   }
3866 }
3867 
3868 // Create the Annotations object that will
3869 // hold the annotations array for the Klass.
3870 void ClassFileParser::create_combined_annotations(TRAPS) {
3871     if (_class_annotations == nullptr &&
3872         _class_type_annotations == nullptr &&
3873         _fields_annotations == nullptr &&
3874         _fields_type_annotations == nullptr) {
3875       // Don't create the Annotations object unnecessarily.
3876       return;
3877     }
3878 
3879     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3880     annotations->set_class_annotations(_class_annotations);
3881     annotations->set_class_type_annotations(_class_type_annotations);
3882     annotations->set_fields_annotations(_fields_annotations);
3883     annotations->set_fields_type_annotations(_fields_type_annotations);
3884 
3885     // This is the Annotations object that will be
3886     // assigned to InstanceKlass being constructed.
3887     _combined_annotations = annotations;
3888 
3889     // The annotations arrays below has been transferred the
3890     // _combined_annotations so these fields can now be cleared.
3891     _class_annotations       = nullptr;
3892     _class_type_annotations  = nullptr;
3893     _fields_annotations      = nullptr;
3894     _fields_type_annotations = nullptr;
3895 }
3896 
3897 // Transfer ownership of metadata allocated to the InstanceKlass.
3898 void ClassFileParser::apply_parsed_class_metadata(
3899                                             InstanceKlass* this_klass,
3900                                             int java_fields_count) {
3901   assert(this_klass != nullptr, "invariant");
3902 
3903   _cp->set_pool_holder(this_klass);
3904   this_klass->set_constants(_cp);
3905   this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3906   this_klass->set_fields_status(_fields_status);
3907   this_klass->set_methods(_methods);
3908   this_klass->set_inner_classes(_inner_classes);
3909   this_klass->set_nest_members(_nest_members);
3910   this_klass->set_nest_host_index(_nest_host);
3911   this_klass->set_loadable_descriptors(_loadable_descriptors);
3912   this_klass->set_annotations(_combined_annotations);
3913   this_klass->set_permitted_subclasses(_permitted_subclasses);
3914   this_klass->set_record_components(_record_components);
3915   this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3916 
3917   // Delay the setting of _local_interfaces and _transitive_interfaces until after
3918   // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3919   // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3920   // its _super. If an OOM occurs while loading the current klass, its _super field
3921   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3922   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3923   // dereferences to the deallocated _transitive_interfaces will result in a crash.
3924 
3925   // Clear out these fields so they don't get deallocated by the destructor
3926   clear_class_metadata();
3927 }
3928 
3929 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3930                                                        int anno_length,
3931                                                        TRAPS) {
3932   AnnotationArray* annotations = nullptr;
3933   if (anno != nullptr) {
3934     annotations = MetadataFactory::new_array<u1>(_loader_data,
3935                                                  anno_length,
3936                                                  CHECK_(annotations));
3937     for (int i = 0; i < anno_length; i++) {
3938       annotations->at_put(i, anno[i]);
3939     }
3940   }
3941   return annotations;
3942 }
3943 
3944 const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp,
3945                                                         const int super_class_index,
3946                                                         const bool need_verify,
3947                                                         TRAPS) {
3948   assert(cp != nullptr, "invariant");
3949   const InstanceKlass* super_klass = nullptr;
3950 
3951   if (super_class_index == 0) {
3952     guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3953                    "Invalid superclass index 0 in class file %s",
3954                    CHECK_NULL);
3955   } else {
3956     guarantee_property(valid_klass_reference_at(super_class_index),
3957                        "Invalid superclass index %u in class file %s",
3958                        super_class_index,
3959                        CHECK_NULL);
3960     // The class name should be legal because it is checked when parsing constant pool.
3961     // However, make sure it is not an array type.
3962     if (cp->tag_at(super_class_index).is_klass()) {
3963       super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index));
3964     }
3965     if (need_verify) {
3966       bool is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY);
3967       guarantee_property(!is_array,
3968                         "Bad superclass name in class file %s", CHECK_NULL);
3969     }
3970   }
3971   return super_klass;
3972 }
3973 
3974 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3975   _max_nonstatic_oop_maps = max_blocks;
3976   _nonstatic_oop_map_count = 0;
3977   if (max_blocks == 0) {
3978     _nonstatic_oop_maps = nullptr;
3979   } else {
3980     _nonstatic_oop_maps =
3981         NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
3982     memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
3983   }
3984 }
3985 
3986 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
3987   assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
3988   return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
3989 }
3990 
3991 // addition of super oop maps
3992 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
3993   assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
3994          nof_blocks <= _max_nonstatic_oop_maps, "invariant");
3995 
3996   memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
3997   _nonstatic_oop_map_count += nof_blocks;
3998 }
3999 
4000 // collection of oops
4001 void OopMapBlocksBuilder::add(int offset, int count) {
4002   if (_nonstatic_oop_map_count == 0) {
4003     _nonstatic_oop_map_count++;
4004   }
4005   OopMapBlock* nonstatic_oop_map = last_oop_map();
4006   if (nonstatic_oop_map->count() == 0) {  // Unused map, set it up
4007     nonstatic_oop_map->set_offset(offset);
4008     nonstatic_oop_map->set_count(count);
4009   } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4010     nonstatic_oop_map->increment_count(count);
4011   } else { // Need a new one...
4012     _nonstatic_oop_map_count++;
4013     assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4014     nonstatic_oop_map = last_oop_map();
4015     nonstatic_oop_map->set_offset(offset);
4016     nonstatic_oop_map->set_count(count);
4017   }
4018 }
4019 
4020 // general purpose copy, e.g. into allocated instanceKlass
4021 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4022   if (_nonstatic_oop_map_count != 0) {
4023     memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4024   }
4025 }
4026 
4027 // Sort and compact adjacent blocks
4028 void OopMapBlocksBuilder::compact() {
4029   if (_nonstatic_oop_map_count <= 1) {
4030     return;
4031   }
4032   /*
4033    * Since field layout sneaks in oops before values, we will be able to condense
4034    * blocks. There is potential to compact between super, own refs and values
4035    * containing refs.
4036    *
4037    * Currently compaction is slightly limited due to values being 8 byte aligned.
4038    * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4039    * and maybe it doesn't need to be.
4040    */
4041   qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4042         (_sort_Fn)OopMapBlock::compare_offset);
4043   if (_nonstatic_oop_map_count < 2) {
4044     return;
4045   }
4046 
4047   // Make a temp copy, and iterate through and copy back into the original
4048   ResourceMark rm;
4049   OopMapBlock* oop_maps_copy =
4050       NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4051   OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4052   copy(oop_maps_copy);
4053   OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4054   unsigned int new_count = 1;
4055   oop_maps_copy++;
4056   while(oop_maps_copy < oop_maps_copy_end) {
4057     assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4058     if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4059       nonstatic_oop_map->increment_count(oop_maps_copy->count());
4060     } else {
4061       nonstatic_oop_map++;
4062       new_count++;
4063       nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4064       nonstatic_oop_map->set_count(oop_maps_copy->count());
4065     }
4066     oop_maps_copy++;
4067   }
4068   assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4069   _nonstatic_oop_map_count = new_count;
4070 }
4071 
4072 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4073   st->print_cr("  OopMapBlocks: %3d  /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4074   if (_nonstatic_oop_map_count > 0) {
4075     OopMapBlock* map = _nonstatic_oop_maps;
4076     OopMapBlock* last_map = last_oop_map();
4077     assert(map <= last_map, "Last less than first");
4078     while (map <= last_map) {
4079       st->print_cr("    Offset: %3d  -%3d Count: %3d", map->offset(),
4080                    map->offset() + map->offset_span() - heapOopSize, map->count());
4081       map++;
4082     }
4083   }
4084 }
4085 
4086 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4087   print_on(st);
4088 }
4089 
4090 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4091   assert(ik != nullptr, "invariant");
4092 
4093   const InstanceKlass* const super = ik->java_super();
4094 
4095   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4096   // in which case we don't have to register objects as finalizable
4097   if (!_has_empty_finalizer) {
4098     if (_has_finalizer ||
4099         (super != nullptr && super->has_finalizer())) {
4100       ik->set_has_finalizer();
4101     }
4102   }
4103 
4104 #ifdef ASSERT
4105   bool f = false;
4106   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4107                                            vmSymbols::void_method_signature());
4108   if (InstanceKlass::is_finalization_enabled() &&
4109       (m != nullptr) && !m->is_empty_method()) {
4110       f = true;
4111   }
4112 
4113   // Spec doesn't prevent agent from redefinition of empty finalizer.
4114   // Despite the fact that it's generally bad idea and redefined finalizer
4115   // will not work as expected we shouldn't abort vm in this case
4116   if (!ik->has_redefined_this_or_super()) {
4117     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4118   }
4119 #endif
4120 
4121   // Check if this klass supports the java.lang.Cloneable interface
4122   if (vmClasses::Cloneable_klass_loaded()) {
4123     if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4124       ik->set_is_cloneable();
4125     }
4126   }
4127 
4128   // If it cannot be fast-path allocated, set a bit in the layout helper.
4129   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4130   assert(ik->size_helper() > 0, "layout_helper is initialized");
4131   if (ik->is_abstract() || ik->is_interface()
4132       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4133       || ik->size_helper() >= FastAllocateSizeLimit) {
4134     // Forbid fast-path allocation.
4135     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4136     ik->set_layout_helper(lh);
4137   }
4138 }
4139 
4140 bool ClassFileParser::supports_inline_types() const {
4141   // Inline types are only supported by class file version 69.65535 and later
4142   return _major_version > JAVA_25_VERSION ||
4143          (_major_version == JAVA_25_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4144 }
4145 
4146 // utility methods for appending an array with check for duplicates
4147 
4148 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4149                               const Array<InstanceKlass*>* const ifs) {
4150   // iterate over new interfaces
4151   for (int i = 0; i < ifs->length(); i++) {
4152     InstanceKlass* const e = ifs->at(i);
4153     assert(e->is_klass() && e->is_interface(), "just checking");
4154     // add new interface
4155     result->append_if_missing(e);
4156   }
4157 }
4158 
4159 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4160                                                             Array<InstanceKlass*>* local_ifs,
4161                                                             ClassLoaderData* loader_data,
4162                                                             TRAPS) {
4163   assert(local_ifs != nullptr, "invariant");
4164   assert(loader_data != nullptr, "invariant");
4165 
4166   // Compute maximum size for transitive interfaces
4167   int max_transitive_size = 0;
4168   int super_size = 0;
4169   // Add superclass transitive interfaces size
4170   if (super != nullptr) {
4171     super_size = super->transitive_interfaces()->length();
4172     max_transitive_size += super_size;
4173   }
4174   // Add local interfaces' super interfaces
4175   const int local_size = local_ifs->length();
4176   for (int i = 0; i < local_size; i++) {
4177     InstanceKlass* const l = local_ifs->at(i);
4178     max_transitive_size += l->transitive_interfaces()->length();
4179   }
4180   // Finally add local interfaces
4181   max_transitive_size += local_size;
4182   // Construct array
4183   if (max_transitive_size == 0) {
4184     // no interfaces, use canonicalized array
4185     return Universe::the_empty_instance_klass_array();
4186   } else if (max_transitive_size == super_size) {
4187     // no new local interfaces added, share superklass' transitive interface array
4188     return super->transitive_interfaces();
4189     // The three lines below are commented to work around bug JDK-8245487
4190 //  } else if (max_transitive_size == local_size) {
4191 //    // only local interfaces added, share local interface array
4192 //    return local_ifs;
4193   } else {
4194     ResourceMark rm;
4195     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4196 
4197     // Copy down from superclass
4198     if (super != nullptr) {
4199       append_interfaces(result, super->transitive_interfaces());
4200     }
4201 
4202     // Copy down from local interfaces' superinterfaces
4203     for (int i = 0; i < local_size; i++) {
4204       InstanceKlass* const l = local_ifs->at(i);
4205       append_interfaces(result, l->transitive_interfaces());
4206     }
4207     // Finally add local interfaces
4208     append_interfaces(result, local_ifs);
4209 
4210     // length will be less than the max_transitive_size if duplicates were removed
4211     const int length = result->length();
4212     assert(length <= max_transitive_size, "just checking");
4213 
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()) {
4238       stringStream ss;
4239       ResourceMark rm(THREAD);
4240       if (!super_ik->has_as_permitted_subclass(this_klass, ss)) {
4241         classfile_icce_error(ss.as_string(), THREAD);
4242         return;
4243       }
4244     }
4245 
4246     // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4247     // flag set. But, java.lang.Object must still be allowed to be a direct super class
4248     // for a value classes.  So, it is treated as a special case for now.
4249     if (!this_klass->access_flags().is_identity_class() &&
4250         super_ik->name() != vmSymbols::java_lang_Object() &&
4251         super_ik->is_identity_class()) {
4252       classfile_icce_error("value class %s cannot inherit from class %s", super_ik, THREAD);
4253       return;
4254     }
4255 
4256     Reflection::VerifyClassAccessResults vca_result =
4257       Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false);
4258     if (vca_result != Reflection::ACCESS_OK) {
4259       ResourceMark rm(THREAD);
4260       char* msg = Reflection::verify_class_access_msg(this_klass,
4261                                                       InstanceKlass::cast(super),
4262                                                       vca_result);
4263 
4264       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4265       if (msg == nullptr) {
4266         bool same_module = (this_klass->module() == super->module());
4267         Exceptions::fthrow(
4268           THREAD_AND_LOCATION,
4269           vmSymbols::java_lang_IllegalAccessError(),
4270           "class %s cannot access its %ssuperclass %s (%s%s%s)",
4271           this_klass->external_name(),
4272           super->is_abstract() ? "abstract " : "",
4273           super->external_name(),
4274           (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4275           (same_module) ? "" : "; ",
4276           (same_module) ? "" : super->class_in_module_of_loader());
4277       } else {
4278         // Add additional message content.
4279         Exceptions::fthrow(
4280           THREAD_AND_LOCATION,
4281           vmSymbols::java_lang_IllegalAccessError(),
4282           "superclass access check failed: %s",
4283           msg);
4284       }
4285     }
4286   }
4287 }
4288 
4289 
4290 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4291   assert(this_klass != nullptr, "invariant");
4292   const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4293   const int lng = local_interfaces->length();
4294   for (int i = lng - 1; i >= 0; i--) {
4295     InstanceKlass* const k = local_interfaces->at(i);
4296     assert (k != nullptr && k->is_interface(), "invalid interface");
4297 
4298     if (k->is_sealed()) {
4299       stringStream ss;
4300       ResourceMark rm(THREAD);
4301       if (!k->has_as_permitted_subclass(this_klass, ss)) {
4302         classfile_icce_error(ss.as_string(), THREAD);
4303         return;
4304       }
4305     }
4306 
4307     Reflection::VerifyClassAccessResults vca_result =
4308       Reflection::verify_class_access(this_klass, k, false);
4309     if (vca_result != Reflection::ACCESS_OK) {
4310       ResourceMark rm(THREAD);
4311       char* msg = Reflection::verify_class_access_msg(this_klass,
4312                                                       k,
4313                                                       vca_result);
4314 
4315       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4316       if (msg == nullptr) {
4317         bool same_module = (this_klass->module() == k->module());
4318         Exceptions::fthrow(
4319           THREAD_AND_LOCATION,
4320           vmSymbols::java_lang_IllegalAccessError(),
4321           "class %s cannot access its superinterface %s (%s%s%s)",
4322           this_klass->external_name(),
4323           k->external_name(),
4324           (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4325           (same_module) ? "" : "; ",
4326           (same_module) ? "" : k->class_in_module_of_loader());
4327         return;
4328       } else {
4329         // Add additional message content.
4330         Exceptions::fthrow(
4331           THREAD_AND_LOCATION,
4332           vmSymbols::java_lang_IllegalAccessError(),
4333           "superinterface check failed: %s",
4334           msg);
4335         return;
4336       }
4337     }
4338   }
4339 }
4340 
4341 
4342 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4343   assert(this_klass != nullptr, "invariant");
4344   const Array<Method*>* const methods = this_klass->methods();
4345   const int num_methods = methods->length();
4346 
4347   // go thru each method and check if it overrides a final method
4348   for (int index = 0; index < num_methods; index++) {
4349     const Method* const m = methods->at(index);
4350 
4351     // skip private, static, and <init> methods
4352     if ((!m->is_private() && !m->is_static()) &&
4353         (m->name() != vmSymbols::object_initializer_name())) {
4354 
4355       const Symbol* const name = m->name();
4356       const Symbol* const signature = m->signature();
4357       const InstanceKlass* k = this_klass->java_super();
4358       const Method* super_m = nullptr;
4359       while (k != nullptr) {
4360         // skip supers that don't have final methods.
4361         if (k->has_final_method()) {
4362           // lookup a matching method in the super class hierarchy
4363           super_m = InstanceKlass::cast(k)->lookup_method(name, signature);
4364           if (super_m == nullptr) {
4365             break; // didn't find any match; get out
4366           }
4367 
4368           if (super_m->is_final() && !super_m->is_static() &&
4369               !super_m->access_flags().is_private()) {
4370             // matching method in super is final, and not static or private
4371             bool can_access = Reflection::verify_member_access(this_klass,
4372                                                                super_m->method_holder(),
4373                                                                super_m->method_holder(),
4374                                                                super_m->access_flags(),
4375                                                               false, false, CHECK);
4376             if (can_access) {
4377               // this class can access super final method and therefore override
4378               ResourceMark rm(THREAD);
4379               THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4380                         err_msg("class %s overrides final method %s.%s%s",
4381                                 this_klass->external_name(),
4382                                 super_m->method_holder()->external_name(),
4383                                 name->as_C_string(),
4384                                 signature->as_C_string()));
4385             }
4386           }
4387 
4388           // continue to look from super_m's holder's super.
4389           k = super_m->method_holder()->java_super();
4390           continue;
4391         }
4392 
4393         k = k->java_super();
4394       }
4395     }
4396   }
4397 }
4398 
4399 
4400 // assumes that this_klass is an interface
4401 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4402   assert(this_klass != nullptr, "invariant");
4403   assert(this_klass->is_interface(), "not an interface");
4404   const Array<Method*>* methods = this_klass->methods();
4405   const int num_methods = methods->length();
4406 
4407   for (int index = 0; index < num_methods; index++) {
4408     const Method* const m = methods->at(index);
4409     // if m is static and not the init method, throw a verify error
4410     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4411       ResourceMark rm(THREAD);
4412 
4413       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4414       Exceptions::fthrow(
4415         THREAD_AND_LOCATION,
4416         vmSymbols::java_lang_VerifyError(),
4417         "Illegal static method %s in interface %s",
4418         m->name()->as_C_string(),
4419         this_klass->external_name()
4420       );
4421       return;
4422     }
4423   }
4424 }
4425 
4426 // utility methods for format checking
4427 
4428 void ClassFileParser::verify_legal_class_modifiers(jint flags, const char* name, bool is_Object, TRAPS) const {
4429   const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4430   const bool is_inner_class = name != nullptr;
4431   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4432   if (is_module) {
4433     ResourceMark rm(THREAD);
4434     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4435     Exceptions::fthrow(
4436       THREAD_AND_LOCATION,
4437       vmSymbols::java_lang_NoClassDefFoundError(),
4438       "%s is not a class because access_flag ACC_MODULE is set",
4439       _class_name->as_C_string());
4440     return;
4441   }
4442 
4443   if (!_need_verify) { return; }
4444 
4445   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4446   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4447   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4448   const bool is_identity   = (flags & JVM_ACC_IDENTITY)   != 0;
4449   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4450   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4451   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4452   const bool valid_value_class = is_identity || is_interface ||
4453                                  (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4454 
4455   if ((is_abstract && is_final) ||
4456       (is_interface && !is_abstract) ||
4457       (is_interface && major_gte_1_5 && (is_identity || is_enum)) ||   //  ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4458       (!is_interface && major_gte_1_5 && is_annotation) ||
4459       (!valid_value_class)) {
4460     ResourceMark rm(THREAD);
4461     const char* class_note = "";
4462     if (!valid_value_class) {
4463       class_note = " (a value class must be final or else abstract)";
4464     }
4465     if (name == nullptr) { // Not an inner class
4466       Exceptions::fthrow(
4467         THREAD_AND_LOCATION,
4468         vmSymbols::java_lang_ClassFormatError(),
4469         "Illegal class modifiers in class %s%s: 0x%X",
4470         _class_name->as_C_string(), class_note, flags
4471       );
4472       return;
4473     } else {
4474       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4475       Exceptions::fthrow(
4476         THREAD_AND_LOCATION,
4477         vmSymbols::java_lang_ClassFormatError(),
4478         "Illegal class modifiers in declaration of inner class %s%s of class %s: 0x%X",
4479         name, class_note, _class_name->as_C_string(), flags
4480       );
4481       return;
4482     }
4483   }
4484 }
4485 
4486 static bool has_illegal_visibility(jint flags) {
4487   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4488   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4489   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4490 
4491   return ((is_public && is_protected) ||
4492           (is_public && is_private) ||
4493           (is_protected && is_private));
4494 }
4495 
4496 // A legal major_version.minor_version must be one of the following:
4497 //
4498 //  Major_version >= 45 and major_version < 56, any minor_version.
4499 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4500 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4501 //
4502 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4503   ResourceMark rm(THREAD);
4504   const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4505   if (major < JAVA_MIN_SUPPORTED_VERSION) {
4506     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4507                          class_name, major, minor, THREAD);
4508     return;
4509   }
4510 
4511   if (major > max_version) {
4512     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4513     Exceptions::fthrow(
4514       THREAD_AND_LOCATION,
4515       vmSymbols::java_lang_UnsupportedClassVersionError(),
4516       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4517       "this version of the Java Runtime only recognizes class file versions up to %u.0",
4518       class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4519     return;
4520   }
4521 
4522   if (major < JAVA_12_VERSION || minor == 0) {
4523     return;
4524   }
4525 
4526   if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4527     if (major != max_version) {
4528       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4529       Exceptions::fthrow(
4530         THREAD_AND_LOCATION,
4531         vmSymbols::java_lang_UnsupportedClassVersionError(),
4532         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4533         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4534         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4535       return;
4536     }
4537 
4538     if (!Arguments::enable_preview()) {
4539       classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4540                            class_name, major, minor, THREAD);
4541       return;
4542     }
4543 
4544   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4545     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4546                          class_name, major, minor, THREAD);
4547   }
4548 }
4549 
4550 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4551                                                    AccessFlags class_access_flags,
4552                                                    TRAPS) const {
4553   if (!_need_verify) { return; }
4554 
4555   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4556   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4557   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4558   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4559   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4560   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4561   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4562   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4563   const bool is_strict    = (flags & JVM_ACC_STRICT)    != 0;
4564   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4565 
4566   const bool is_interface = class_access_flags.is_interface();
4567   const bool is_identity_class = class_access_flags.is_identity_class();
4568 
4569   bool is_illegal = false;
4570   const char* error_msg = "";
4571 
4572   // There is some overlap in the checks that apply, for example interface fields
4573   // must be static, static fields can't be strict, and therefore interfaces can't
4574   // have strict fields. So we don't have to check every possible invalid combination
4575   // individually as long as all are covered. Once we have found an illegal combination
4576   // we can stop checking.
4577 
4578   if (supports_inline_types()) {
4579     if (is_strict && is_static) {
4580       is_illegal = true;
4581       error_msg = "field cannot be strict and static";
4582     }
4583     else if (is_strict && !is_final) {
4584       is_illegal = true;
4585       error_msg = "strict field must be final";
4586     }
4587   }
4588 
4589   if (!is_illegal) {
4590     if (is_interface) {
4591       if (!is_public || !is_static || !is_final || is_private ||
4592           is_protected || is_volatile || is_transient ||
4593           (major_gte_1_5 && is_enum)) {
4594         is_illegal = true;
4595         error_msg = "interface fields must be public, static and final, and may be synthetic";
4596       }
4597     } else { // not interface
4598       if (has_illegal_visibility(flags)) {
4599         is_illegal = true;
4600         error_msg = "invalid visibility flags for class field";
4601       } else if (is_final && is_volatile) {
4602         is_illegal = true;
4603         error_msg = "fields cannot be final and volatile";
4604       } else if (supports_inline_types()) {
4605         if (!is_identity_class && !is_static && !is_strict) {
4606           is_illegal = true;
4607           error_msg = "value class fields must be either strict or static";
4608         }
4609       }
4610     }
4611   }
4612 
4613   if (is_illegal) {
4614     ResourceMark rm(THREAD);
4615     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4616     Exceptions::fthrow(
4617       THREAD_AND_LOCATION,
4618       vmSymbols::java_lang_ClassFormatError(),
4619       "Illegal field modifiers (%s) in class %s: 0x%X",
4620       error_msg, _class_name->as_C_string(), flags);
4621     return;
4622   }
4623 }
4624 
4625 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4626                                                     AccessFlags class_access_flags,
4627                                                     const Symbol* name,
4628                                                     TRAPS) const {
4629   if (!_need_verify) { return; }
4630 
4631   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4632   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4633   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4634   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4635   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4636   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4637   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4638   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4639   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4640   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4641   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
4642   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4643   const bool major_gte_17    = _major_version >= JAVA_17_VERSION;
4644   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4645   // LW401 CR required: removal of value factories support
4646   const bool is_interface    = class_access_flags.is_interface();
4647   const bool is_identity_class = class_access_flags.is_identity_class();
4648   const bool is_abstract_class = class_access_flags.is_abstract();
4649 
4650   bool is_illegal = false;
4651 
4652   const char* class_note = "";
4653   if (is_interface) {
4654     if (major_gte_8) {
4655       // Class file version is JAVA_8_VERSION or later Methods of
4656       // interfaces may set any of the flags except ACC_PROTECTED,
4657       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4658       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4659       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4660           (is_native || is_protected || is_final || is_synchronized) ||
4661           // If a specific method of a class or interface has its
4662           // ACC_ABSTRACT flag set, it must not have any of its
4663           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4664           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4665           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4666           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4667           (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4668         is_illegal = true;
4669       }
4670     } else if (major_gte_1_5) {
4671       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4672       if (!is_public || is_private || is_protected || is_static || is_final ||
4673           is_synchronized || is_native || !is_abstract || is_strict) {
4674         is_illegal = true;
4675       }
4676     } else {
4677       // Class file version is pre-JAVA_1_5_VERSION
4678       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4679         is_illegal = true;
4680       }
4681     }
4682   } else { // not interface
4683     if (has_illegal_visibility(flags)) {
4684       is_illegal = true;
4685     } else {
4686       if (is_initializer) {
4687         if (is_static || is_final || is_synchronized || is_native ||
4688             is_abstract || (major_gte_1_5 && is_bridge)) {
4689           is_illegal = true;
4690         }
4691       } else { // not initializer
4692         if (!is_identity_class && is_synchronized && !is_static) {
4693           is_illegal = true;
4694           class_note = " (not an identity class)";
4695         } else {
4696           if (is_abstract) {
4697             if ((is_final || is_native || is_private || is_static ||
4698                 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4699               is_illegal = true;
4700             }
4701           }
4702         }
4703       }
4704     }
4705   }
4706 
4707   if (is_illegal) {
4708     ResourceMark rm(THREAD);
4709     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4710     Exceptions::fthrow(
4711       THREAD_AND_LOCATION,
4712       vmSymbols::java_lang_ClassFormatError(),
4713       "Method %s in class %s%s has illegal modifiers: 0x%X",
4714       name->as_C_string(), _class_name->as_C_string(),
4715       class_note, flags);
4716     return;
4717   }
4718 }
4719 
4720 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4721                                         int length,
4722                                         TRAPS) const {
4723   assert(_need_verify, "only called when _need_verify is true");
4724   // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4725   if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4726     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4727   }
4728 }
4729 
4730 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4731 // In class names, '/' separates unqualified names.  This is verified in this function also.
4732 // Method names also may not contain the characters '<' or '>', unless <init>
4733 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4734 // method.  Because these names have been checked as special cases before
4735 // calling this method in verify_legal_method_name.
4736 //
4737 // This method is also called from the modular system APIs in modules.cpp
4738 // to verify the validity of module and package names.
4739 bool ClassFileParser::verify_unqualified_name(const char* name,
4740                                               unsigned int length,
4741                                               int type) {
4742   if (length == 0) return false;  // Must have at least one char.
4743   for (const char* p = name; p != name + length; p++) {
4744     switch(*p) {
4745       case JVM_SIGNATURE_DOT:
4746       case JVM_SIGNATURE_ENDCLASS:
4747       case JVM_SIGNATURE_ARRAY:
4748         // do not permit '.', ';', or '['
4749         return false;
4750       case JVM_SIGNATURE_SLASH:
4751         // check for '//' or leading or trailing '/' which are not legal
4752         // unqualified name must not be empty
4753         if (type == ClassFileParser::LegalClass) {
4754           if (p == name || p+1 >= name+length ||
4755               *(p+1) == JVM_SIGNATURE_SLASH) {
4756             return false;
4757           }
4758         } else {
4759           return false;   // do not permit '/' unless it's class name
4760         }
4761         break;
4762       case JVM_SIGNATURE_SPECIAL:
4763       case JVM_SIGNATURE_ENDSPECIAL:
4764         // do not permit '<' or '>' in method names
4765         if (type == ClassFileParser::LegalMethod) {
4766           return false;
4767         }
4768     }
4769   }
4770   return true;
4771 }
4772 
4773 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4774   if (_loadable_descriptors == nullptr) return false;
4775   for (int i = 0; i < _loadable_descriptors->length(); i++) {
4776         Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4777         if (class_name == klass) return true;
4778   }
4779   return false;
4780 }
4781 
4782 // Take pointer to a UTF8 byte string (not NUL-terminated).
4783 // Skip over the longest part of the string that could
4784 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4785 // Return a pointer to just past the fieldname.
4786 // Return null if no fieldname at all was found, or in the case of slash_ok
4787 // being true, we saw consecutive slashes (meaning we were looking for a
4788 // qualified path but found something that was badly-formed).
4789 static const char* skip_over_field_name(const char* const name,
4790                                         bool slash_ok,
4791                                         unsigned int length) {
4792   const char* p;
4793   jboolean last_is_slash = false;
4794   jboolean not_first_ch = false;
4795 
4796   for (p = name; p != name + length; not_first_ch = true) {
4797     const char* old_p = p;
4798     jchar ch = *p;
4799     if (ch < 128) {
4800       p++;
4801       // quick check for ascii
4802       if ((ch >= 'a' && ch <= 'z') ||
4803         (ch >= 'A' && ch <= 'Z') ||
4804         (ch == '_' || ch == '$') ||
4805         (not_first_ch && ch >= '0' && ch <= '9')) {
4806         last_is_slash = false;
4807         continue;
4808       }
4809       if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4810         if (last_is_slash) {
4811           return nullptr;  // Don't permit consecutive slashes
4812         }
4813         last_is_slash = true;
4814         continue;
4815       }
4816     }
4817     else {
4818       jint unicode_ch;
4819       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4820       p = tmp_p;
4821       last_is_slash = false;
4822       // Check if ch is Java identifier start or is Java identifier part
4823       // 4672820: call java.lang.Character methods directly without generating separate tables.
4824       EXCEPTION_MARK;
4825       // return value
4826       JavaValue result(T_BOOLEAN);
4827       // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4828       JavaCallArguments args;
4829       args.push_int(unicode_ch);
4830 
4831       if (not_first_ch) {
4832         // public static boolean isJavaIdentifierPart(char ch);
4833         JavaCalls::call_static(&result,
4834           vmClasses::Character_klass(),
4835           vmSymbols::isJavaIdentifierPart_name(),
4836           vmSymbols::int_bool_signature(),
4837           &args,
4838           THREAD);
4839       } else {
4840         // public static boolean isJavaIdentifierStart(char ch);
4841         JavaCalls::call_static(&result,
4842           vmClasses::Character_klass(),
4843           vmSymbols::isJavaIdentifierStart_name(),
4844           vmSymbols::int_bool_signature(),
4845           &args,
4846           THREAD);
4847       }
4848       if (HAS_PENDING_EXCEPTION) {
4849         CLEAR_PENDING_EXCEPTION;
4850         return nullptr;
4851       }
4852       if(result.get_jboolean()) {
4853         continue;
4854       }
4855     }
4856     return (not_first_ch) ? old_p : nullptr;
4857   }
4858   return (not_first_ch && !last_is_slash) ? p : nullptr;
4859 }
4860 
4861 // Take pointer to a UTF8 byte string (not NUL-terminated).
4862 // Skip over the longest part of the string that could
4863 // be taken as a field signature. Allow "void" if void_ok.
4864 // Return a pointer to just past the signature.
4865 // Return null if no legal signature is found.
4866 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4867                                                        bool void_ok,
4868                                                        unsigned int length,
4869                                                        TRAPS) const {
4870   unsigned int array_dim = 0;
4871   while (length > 0) {
4872     switch (signature[0]) {
4873     case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4874     case JVM_SIGNATURE_BOOLEAN:
4875     case JVM_SIGNATURE_BYTE:
4876     case JVM_SIGNATURE_CHAR:
4877     case JVM_SIGNATURE_SHORT:
4878     case JVM_SIGNATURE_INT:
4879     case JVM_SIGNATURE_FLOAT:
4880     case JVM_SIGNATURE_LONG:
4881     case JVM_SIGNATURE_DOUBLE:
4882       return signature + 1;
4883     case JVM_SIGNATURE_CLASS:
4884     {
4885       if (_major_version < JAVA_1_5_VERSION) {
4886         // Skip over the class name if one is there
4887         const char* const p = skip_over_field_name(signature + 1, true, --length);
4888 
4889         // The next character better be a semicolon
4890         if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) {
4891           return p + 1;
4892         }
4893       }
4894       else {
4895         // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4896         signature++;
4897         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4898         // Format check signature
4899         if (c != nullptr) {
4900           int newlen = pointer_delta_as_int(c, (char*) signature);
4901           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4902           if (!legal) {
4903             classfile_parse_error("Class name is empty or contains illegal character "
4904                                   "in descriptor in class file %s",
4905                                   THREAD);
4906             return nullptr;
4907           }
4908           return signature + newlen + 1;
4909         }
4910       }
4911       return nullptr;
4912     }
4913     case JVM_SIGNATURE_ARRAY:
4914       array_dim++;
4915       if (array_dim > 255) {
4916         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4917         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4918         return nullptr;
4919       }
4920       // The rest of what's there better be a legal signature
4921       signature++;
4922       length--;
4923       void_ok = false;
4924       break;
4925     default:
4926       return nullptr;
4927     }
4928   }
4929   return nullptr;
4930 }
4931 
4932 // Checks if name is a legal class name.
4933 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4934   if (!_need_verify) { return; }
4935 
4936   assert(name->refcount() > 0, "symbol must be kept alive");
4937   char* bytes = (char*)name->bytes();
4938   unsigned int length = name->utf8_length();
4939   bool legal = false;
4940 
4941   if (length > 0) {
4942     const char* p;
4943     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4944       p = skip_over_field_signature(bytes, false, length, CHECK);
4945       legal = (p != nullptr) && ((p - bytes) == (int)length);
4946     } else if (_major_version < JAVA_1_5_VERSION) {
4947       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4948         p = skip_over_field_name(bytes, true, length);
4949         legal = (p != nullptr) && ((p - bytes) == (int)length);
4950       }
4951     } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4952                    && bytes[length - 1] == ';' ) {
4953       // Support for L...; descriptors
4954       legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4955     } else {
4956       // 4900761: relax the constraints based on JSR202 spec
4957       // Class names may be drawn from the entire Unicode character set.
4958       // Identifiers between '/' must be unqualified names.
4959       // The utf8 string has been verified when parsing cpool entries.
4960       legal = verify_unqualified_name(bytes, length, LegalClass);
4961     }
4962   }
4963   if (!legal) {
4964     ResourceMark rm(THREAD);
4965     assert(_class_name != nullptr, "invariant");
4966     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4967     Exceptions::fthrow(
4968       THREAD_AND_LOCATION,
4969       vmSymbols::java_lang_ClassFormatError(),
4970       "Illegal class name \"%.*s\" in class file %s", length, bytes,
4971       _class_name->as_C_string()
4972     );
4973     return;
4974   }
4975 }
4976 
4977 // Checks if name is a legal field name.
4978 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
4979   if (!_need_verify) { return; }
4980 
4981   char* bytes = (char*)name->bytes();
4982   unsigned int length = name->utf8_length();
4983   bool legal = false;
4984 
4985   if (length > 0) {
4986     if (_major_version < JAVA_1_5_VERSION) {
4987       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4988         const char* p = skip_over_field_name(bytes, false, length);
4989         legal = (p != nullptr) && ((p - bytes) == (int)length);
4990       }
4991     } else {
4992       // 4881221: relax the constraints based on JSR202 spec
4993       legal = verify_unqualified_name(bytes, length, LegalField);
4994     }
4995   }
4996 
4997   if (!legal) {
4998     ResourceMark rm(THREAD);
4999     assert(_class_name != nullptr, "invariant");
5000     // Names are all known to be < 64k so we know this formatted message is not excessively large.
5001     Exceptions::fthrow(
5002       THREAD_AND_LOCATION,
5003       vmSymbols::java_lang_ClassFormatError(),
5004       "Illegal field name \"%.*s\" in class %s", length, bytes,
5005       _class_name->as_C_string()
5006     );
5007     return;
5008   }
5009 }
5010 
5011 // Checks if name is a legal method name.
5012 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5013   if (!_need_verify) { return; }
5014 
5015   assert(name != nullptr, "method name is null");
5016   char* bytes = (char*)name->bytes();
5017   unsigned int length = name->utf8_length();
5018   bool legal = false;
5019 
5020   if (length > 0) {
5021     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5022       if (name == vmSymbols::object_initializer_name() ||
5023           name == vmSymbols::class_initializer_name()) {
5024         legal = true;
5025       }
5026     } else if (_major_version < JAVA_1_5_VERSION) {
5027       const char* p;
5028       p = skip_over_field_name(bytes, false, length);
5029       legal = (p != nullptr) && ((p - bytes) == (int)length);
5030     } else {
5031       // 4881221: relax the constraints based on JSR202 spec
5032       legal = verify_unqualified_name(bytes, length, LegalMethod);
5033     }
5034   }
5035 
5036   if (!legal) {
5037     ResourceMark rm(THREAD);
5038     assert(_class_name != nullptr, "invariant");
5039     // Names are all known to be < 64k so we know this formatted message is not excessively large.
5040     Exceptions::fthrow(
5041       THREAD_AND_LOCATION,
5042       vmSymbols::java_lang_ClassFormatError(),
5043       "Illegal method name \"%.*s\" in class %s", length, bytes,
5044       _class_name->as_C_string()
5045     );
5046     return;
5047   }
5048 }
5049 
5050 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5051   const char* const bytes = (const char*)signature->bytes();
5052   const unsigned int length = signature->utf8_length();
5053   const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5054 
5055   if (p == nullptr || (p - bytes) != (int)length) {
5056     return false;
5057   }
5058   return true;
5059 }
5060 
5061 // Checks if signature is a legal field signature.
5062 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5063                                                    const Symbol* signature,
5064                                                    TRAPS) const {
5065   if (!_need_verify) { return; }
5066 
5067   const char* const bytes = (const char*)signature->bytes();
5068   const unsigned int length = signature->utf8_length();
5069   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5070 
5071   if (p == nullptr || (p - bytes) != (int)length) {
5072     throwIllegalSignature("Field", name, signature, CHECK);
5073   }
5074 }
5075 
5076 // Check that the signature is compatible with the method name.  For example,
5077 // check that <init> has a void signature.
5078 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5079                                                        const Symbol* signature,
5080                                                        TRAPS) const {
5081   if (!_need_verify) {
5082     return;
5083   }
5084 
5085   // Class initializers cannot have args for class format version >= 51.
5086   if (name == vmSymbols::class_initializer_name() &&
5087       signature != vmSymbols::void_method_signature() &&
5088       _major_version >= JAVA_7_VERSION) {
5089     throwIllegalSignature("Method", name, signature, THREAD);
5090     return;
5091   }
5092 
5093   int sig_length = signature->utf8_length();
5094   if (name->utf8_length() > 0 &&
5095     name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5096     sig_length > 0 &&
5097     signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5098     throwIllegalSignature("Method", name, signature, THREAD);
5099   }
5100 }
5101 
5102 // Checks if signature is a legal method signature.
5103 // Returns number of parameters
5104 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5105                                                    const Symbol* signature,
5106                                                    TRAPS) const {
5107   if (!_need_verify) {
5108     // make sure caller's args_size will be less than 0 even for non-static
5109     // method so it will be recomputed in compute_size_of_parameters().
5110     return -2;
5111   }
5112 
5113   unsigned int args_size = 0;
5114   const char* p = (const char*)signature->bytes();
5115   unsigned int length = signature->utf8_length();
5116   const char* nextp;
5117 
5118   // The first character must be a '('
5119   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5120     length--;
5121     // Skip over legal field signatures
5122     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5123     while ((length > 0) && (nextp != nullptr)) {
5124       args_size++;
5125       if (p[0] == 'J' || p[0] == 'D') {
5126         args_size++;
5127       }
5128       length -= pointer_delta_as_int(nextp, p);
5129       p = nextp;
5130       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5131     }
5132     // The first non-signature thing better be a ')'
5133     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5134       length--;
5135       // Now we better just have a return value
5136       nextp = skip_over_field_signature(p, true, length, CHECK_0);
5137       if (nextp && ((int)length == (nextp - p))) {
5138         return args_size;
5139       }
5140     }
5141   }
5142   // Report error
5143   throwIllegalSignature("Method", name, signature, THREAD);
5144   return 0;
5145 }
5146 
5147 int ClassFileParser::static_field_size() const {
5148   assert(_layout_info != nullptr, "invariant");
5149   return _layout_info->_static_field_size;
5150 }
5151 
5152 int ClassFileParser::total_oop_map_count() const {
5153   assert(_layout_info != nullptr, "invariant");
5154   return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5155 }
5156 
5157 jint ClassFileParser::layout_size() const {
5158   assert(_layout_info != nullptr, "invariant");
5159   return _layout_info->_instance_size;
5160 }
5161 
5162 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5163                                          const Array<Method*>* methods) {
5164   assert(ik != nullptr, "invariant");
5165   assert(methods != nullptr, "invariant");
5166 
5167   // Set up Method*::intrinsic_id as soon as we know the names of methods.
5168   // (We used to do this lazily, but now we query it in Rewriter,
5169   // which is eagerly done for every method, so we might as well do it now,
5170   // when everything is fresh in memory.)
5171   const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5172 
5173   if (klass_id != vmSymbolID::NO_SID) {
5174     for (int j = 0; j < methods->length(); ++j) {
5175       Method* method = methods->at(j);
5176       method->init_intrinsic_id(klass_id);
5177 
5178       if (CheckIntrinsics) {
5179         // Check if an intrinsic is defined for method 'method',
5180         // but the method is not annotated with @IntrinsicCandidate.
5181         if (method->intrinsic_id() != vmIntrinsics::_none &&
5182             !method->intrinsic_candidate()) {
5183               tty->print("Compiler intrinsic is defined for method [%s], "
5184               "but the method is not annotated with @IntrinsicCandidate.%s",
5185               method->name_and_sig_as_C_string(),
5186               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5187             );
5188           tty->cr();
5189           DEBUG_ONLY(vm_exit(1));
5190         }
5191         // Check is the method 'method' is annotated with @IntrinsicCandidate,
5192         // but there is no intrinsic available for it.
5193         if (method->intrinsic_candidate() &&
5194           method->intrinsic_id() == vmIntrinsics::_none) {
5195             tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5196               "but no compiler intrinsic is defined for the method.%s",
5197               method->name_and_sig_as_C_string(),
5198               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5199             );
5200           tty->cr();
5201           DEBUG_ONLY(vm_exit(1));
5202         }
5203       }
5204     } // end for
5205 
5206 #ifdef ASSERT
5207     if (CheckIntrinsics) {
5208       // Check for orphan methods in the current class. A method m
5209       // of a class C is orphan if an intrinsic is defined for method m,
5210       // but class C does not declare m.
5211       // The check is potentially expensive, therefore it is available
5212       // only in debug builds.
5213 
5214       for (auto id : EnumRange<vmIntrinsicID>{}) {
5215         if (vmIntrinsics::_compiledLambdaForm == id) {
5216           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5217           // generated for the JVM from a LambdaForm and therefore no method
5218           // is defined for it.
5219           continue;
5220         }
5221         if (vmIntrinsics::_blackhole == id) {
5222           // The _blackhole intrinsic is a special marker. No explicit method
5223           // is defined for it.
5224           continue;
5225         }
5226 
5227         if (vmIntrinsics::class_for(id) == klass_id) {
5228           // Check if the current class contains a method with the same
5229           // name, flags, signature.
5230           bool match = false;
5231           for (int j = 0; j < methods->length(); ++j) {
5232             const Method* method = methods->at(j);
5233             if (method->intrinsic_id() == id) {
5234               match = true;
5235               break;
5236             }
5237           }
5238 
5239           if (!match) {
5240             char buf[1000];
5241             tty->print("Compiler intrinsic is defined for method [%s], "
5242                        "but the method is not available in class [%s].%s",
5243                         vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5244                         ik->name()->as_C_string(),
5245                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5246             );
5247             tty->cr();
5248             DEBUG_ONLY(vm_exit(1));
5249           }
5250         }
5251       } // end for
5252     } // CheckIntrinsics
5253 #endif // ASSERT
5254   }
5255 }
5256 
5257 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5258                                                       const ClassInstanceInfo& cl_inst_info,
5259                                                       TRAPS) {
5260   if (_klass != nullptr) {
5261     return _klass;
5262   }
5263 
5264   InstanceKlass* const ik =
5265     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5266 
5267   if (is_hidden()) {
5268     mangle_hidden_class_name(ik);
5269   }
5270 
5271   fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5272 
5273   assert(_klass == ik, "invariant");
5274   return ik;
5275 }
5276 
5277 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5278                                           bool changed_by_loadhook,
5279                                           const ClassInstanceInfo& cl_inst_info,
5280                                           TRAPS) {
5281   assert(ik != nullptr, "invariant");
5282 
5283   // Set name and CLD before adding to CLD
5284   ik->set_class_loader_data(_loader_data);
5285   ik->set_name(_class_name);
5286 
5287   // Add all classes to our internal class loader list here,
5288   // including classes in the bootstrap (null) class loader.
5289   const bool publicize = !is_internal();
5290 
5291   _loader_data->add_class(ik, publicize);
5292 
5293   set_klass_to_deallocate(ik);
5294 
5295   assert(_layout_info != nullptr, "invariant");
5296   assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5297   assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5298          "sanity");
5299 
5300   assert(ik->is_instance_klass(), "sanity");
5301   assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5302 
5303   // Fill in information already parsed
5304   ik->set_should_verify_class(_need_verify);
5305 
5306   // Not yet: supers are done below to support the new subtype-checking fields
5307   ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5308   ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5309 
5310   if (_layout_info->_is_naturally_atomic) {
5311     ik->set_is_naturally_atomic();
5312   }
5313 
5314   if (_layout_info->_must_be_atomic) {
5315     ik->set_must_be_atomic();
5316   }
5317   if (_is_implicitly_constructible) {
5318     ik->set_is_implicitly_constructible();
5319   }
5320 
5321   ik->set_static_oop_field_count(_static_oop_count);
5322 
5323   // this transfers ownership of a lot of arrays from
5324   // the parser onto the InstanceKlass*
5325   apply_parsed_class_metadata(ik, _java_fields_count);
5326   if (ik->is_inline_klass()) {
5327     InlineKlass::cast(ik)->init_fixed_block();
5328   }
5329 
5330   // can only set dynamic nest-host after static nest information is set
5331   if (cl_inst_info.dynamic_nest_host() != nullptr) {
5332     ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5333   }
5334 
5335   // note that is not safe to use the fields in the parser from this point on
5336   assert(nullptr == _cp, "invariant");
5337   assert(nullptr == _fieldinfo_stream, "invariant");
5338   assert(nullptr == _fields_status, "invariant");
5339   assert(nullptr == _methods, "invariant");
5340   assert(nullptr == _inner_classes, "invariant");
5341   assert(nullptr == _nest_members, "invariant");
5342   assert(nullptr == _loadable_descriptors, "invariant");
5343   assert(nullptr == _combined_annotations, "invariant");
5344   assert(nullptr == _record_components, "invariant");
5345   assert(nullptr == _permitted_subclasses, "invariant");
5346   assert(nullptr == _inline_layout_info_array, "invariant");
5347 
5348   if (_has_localvariable_table) {
5349     ik->set_has_localvariable_table(true);
5350   }
5351 
5352   if (_has_final_method) {
5353     ik->set_has_final_method();
5354   }
5355 
5356   ik->copy_method_ordering(_method_ordering, CHECK);
5357   // The InstanceKlass::_methods_jmethod_ids cache
5358   // is managed on the assumption that the initial cache
5359   // size is equal to the number of methods in the class. If
5360   // that changes, then InstanceKlass::idnum_can_increment()
5361   // has to be changed accordingly.
5362   ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5363 
5364   ik->set_this_class_index(_this_class_index);
5365 
5366   if (_is_hidden) {
5367     // _this_class_index is a CONSTANT_Class entry that refers to this
5368     // hidden class itself. If this class needs to refer to its own methods
5369     // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5370     // _this_class_index. However, because this class is hidden (it's
5371     // not stored in SystemDictionary), _this_class_index cannot be resolved
5372     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5373     // Therefore, we must eagerly resolve _this_class_index now.
5374     ik->constants()->klass_at_put(_this_class_index, ik);
5375   }
5376 
5377   ik->set_minor_version(_minor_version);
5378   ik->set_major_version(_major_version);
5379   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5380   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5381 
5382   assert(!_is_hidden || ik->is_hidden(), "must be set already");
5383 
5384   // Set PackageEntry for this_klass
5385   oop cl = ik->class_loader();
5386   Handle clh = Handle(THREAD, cl);
5387   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5388   ik->set_package(cld, nullptr, CHECK);
5389 
5390   const Array<Method*>* const methods = ik->methods();
5391   assert(methods != nullptr, "invariant");
5392   const int methods_len = methods->length();
5393 
5394   check_methods_for_intrinsics(ik, methods);
5395 
5396   // Fill in field values obtained by parse_classfile_attributes
5397   if (_parsed_annotations->has_any_annotations()) {
5398     _parsed_annotations->apply_to(ik);
5399   }
5400 
5401   apply_parsed_class_attributes(ik);
5402 
5403   // Miranda methods
5404   if ((_num_miranda_methods > 0) ||
5405       // if this class introduced new miranda methods or
5406       (_super_klass != nullptr && _super_klass->has_miranda_methods())
5407         // super class exists and this class inherited miranda methods
5408      ) {
5409        ik->set_has_miranda_methods(); // then set a flag
5410   }
5411 
5412   // Fill in information needed to compute superclasses.
5413   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5414   ik->set_transitive_interfaces(_transitive_interfaces);
5415   ik->set_local_interfaces(_local_interfaces);
5416   _transitive_interfaces = nullptr;
5417   _local_interfaces = nullptr;
5418 
5419   // Initialize itable offset tables
5420   klassItable::setup_itable_offset_table(ik);
5421 
5422   // Compute transitive closure of interfaces this class implements
5423   // Do final class setup
5424   OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5425   if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5426     oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5427   }
5428 
5429   if (_has_contended_fields || _parsed_annotations->is_contended() ||
5430       ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5431     ik->set_has_contended_annotations(true);
5432   }
5433 
5434   // Fill in has_finalizer and layout_helper
5435   set_precomputed_flags(ik);
5436 
5437   // check if this class can access its super class
5438   check_super_class_access(ik, CHECK);
5439 
5440   // check if this class can access its superinterfaces
5441   check_super_interface_access(ik, CHECK);
5442 
5443   // check if this class overrides any final method
5444   check_final_method_override(ik, CHECK);
5445 
5446   // reject static interface methods prior to Java 8
5447   if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5448     check_illegal_static_method(ik, CHECK);
5449   }
5450 
5451   // Obtain this_klass' module entry
5452   ModuleEntry* module_entry = ik->module();
5453   assert(module_entry != nullptr, "module_entry should always be set");
5454 
5455   // Obtain java.lang.Module
5456   Handle module_handle(THREAD, module_entry->module());
5457 
5458   // Allocate mirror and initialize static fields
5459   java_lang_Class::create_mirror(ik,
5460                                  Handle(THREAD, _loader_data->class_loader()),
5461                                  module_handle,
5462                                  _protection_domain,
5463                                  cl_inst_info.class_data(),
5464                                  CHECK);
5465 
5466   assert(_all_mirandas != nullptr, "invariant");
5467 
5468   // Generate any default methods - default methods are public interface methods
5469   // that have a default implementation.  This is new with Java 8.
5470   if (_has_nonstatic_concrete_methods) {
5471     DefaultMethods::generate_default_methods(ik,
5472                                              _all_mirandas,
5473                                              CHECK);
5474   }
5475 
5476   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5477   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5478       !module_entry->has_default_read_edges()) {
5479     if (!module_entry->set_has_default_read_edges()) {
5480       // We won a potential race
5481       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5482     }
5483   }
5484 
5485   if (is_inline_type()) {
5486     InlineKlass* vk = InlineKlass::cast(ik);
5487     vk->set_payload_alignment(_layout_info->_payload_alignment);
5488     vk->set_payload_offset(_layout_info->_payload_offset);
5489     vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5490     vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5491     vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5492     vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5493     vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5494     vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5495     vk->set_default_value_offset(_layout_info->_default_value_offset);
5496     vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5497     if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5498     vk->initialize_calling_convention(CHECK);
5499   }
5500 
5501   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5502 
5503   if (!is_internal()) {
5504     ik->print_class_load_logging(_loader_data, module_entry, _stream);
5505 
5506     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5507         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5508         log_is_enabled(Info, class, preview)) {
5509       ResourceMark rm;
5510       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5511                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5512     }
5513 
5514     if (log_is_enabled(Debug, class, resolve))  {
5515       ResourceMark rm;
5516       // print out the superclass.
5517       const char * from = ik->external_name();
5518       if (ik->java_super() != nullptr) {
5519         log_debug(class, resolve)("%s %s (super)",
5520                    from,
5521                    ik->java_super()->external_name());
5522       }
5523       // print out each of the interface classes referred to by this class.
5524       const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5525       if (local_interfaces != nullptr) {
5526         const int length = local_interfaces->length();
5527         for (int i = 0; i < length; i++) {
5528           const InstanceKlass* const k = local_interfaces->at(i);
5529           const char * to = k->external_name();
5530           log_debug(class, resolve)("%s %s (interface)", from, to);
5531         }
5532       }
5533     }
5534   }
5535 
5536   JFR_ONLY(INIT_ID(ik);)
5537 
5538   // If we reach here, all is well.
5539   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5540   // in order for it to not be destroyed in the ClassFileParser destructor.
5541   set_klass_to_deallocate(nullptr);
5542 
5543   // it's official
5544   set_klass(ik);
5545 
5546   debug_only(ik->verify();)
5547 }
5548 
5549 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5550   // Decrement the refcount in the old name, since we're clobbering it.
5551   _class_name->decrement_refcount();
5552 
5553   _class_name = new_class_name;
5554   // Increment the refcount of the new name.
5555   // Now the ClassFileParser owns this name and will decrement in
5556   // the destructor.
5557   _class_name->increment_refcount();
5558 }
5559 
5560 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5561                                  Symbol* name,
5562                                  ClassLoaderData* loader_data,
5563                                  const ClassLoadInfo* cl_info,
5564                                  Publicity pub_level,
5565                                  TRAPS) :
5566   _stream(stream),
5567   _class_name(nullptr),
5568   _loader_data(loader_data),
5569   _is_hidden(cl_info->is_hidden()),
5570   _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5571   _orig_cp_size(0),
5572   _static_oop_count(0),
5573   _super_klass(),
5574   _cp(nullptr),
5575   _fieldinfo_stream(nullptr),
5576   _fields_status(nullptr),
5577   _methods(nullptr),
5578   _inner_classes(nullptr),
5579   _nest_members(nullptr),
5580   _nest_host(0),
5581   _permitted_subclasses(nullptr),
5582   _loadable_descriptors(nullptr),
5583   _record_components(nullptr),
5584   _local_interfaces(nullptr),
5585   _local_interface_indexes(nullptr),
5586   _transitive_interfaces(nullptr),
5587   _combined_annotations(nullptr),
5588   _class_annotations(nullptr),
5589   _class_type_annotations(nullptr),
5590   _fields_annotations(nullptr),
5591   _fields_type_annotations(nullptr),
5592   _klass(nullptr),
5593   _klass_to_deallocate(nullptr),
5594   _parsed_annotations(nullptr),
5595   _layout_info(nullptr),
5596   _inline_layout_info_array(nullptr),
5597   _temp_field_info(nullptr),
5598   _method_ordering(nullptr),
5599   _all_mirandas(nullptr),
5600   _vtable_size(0),
5601   _itable_size(0),
5602   _num_miranda_methods(0),
5603   _protection_domain(cl_info->protection_domain()),
5604   _access_flags(),
5605   _pub_level(pub_level),
5606   _bad_constant_seen(0),
5607   _synthetic_flag(false),
5608   _sde_length(false),
5609   _sde_buffer(nullptr),
5610   _sourcefile_index(0),
5611   _generic_signature_index(0),
5612   _major_version(0),
5613   _minor_version(0),
5614   _this_class_index(0),
5615   _super_class_index(0),
5616   _itfs_len(0),
5617   _java_fields_count(0),
5618   _need_verify(false),
5619   _has_nonstatic_concrete_methods(false),
5620   _declares_nonstatic_concrete_methods(false),
5621   _has_localvariable_table(false),
5622   _has_final_method(false),
5623   _has_contended_fields(false),
5624   _has_inline_type_fields(false),
5625   _is_naturally_atomic(false),
5626   _must_be_atomic(true),
5627   _is_implicitly_constructible(false),
5628   _has_loosely_consistent_annotation(false),
5629   _has_implicitly_constructible_annotation(false),
5630   _has_finalizer(false),
5631   _has_empty_finalizer(false),
5632   _max_bootstrap_specifier_index(-1) {
5633 
5634   _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5635   _class_name->increment_refcount();
5636 
5637   assert(_loader_data != nullptr, "invariant");
5638   assert(stream != nullptr, "invariant");
5639   assert(_stream != nullptr, "invariant");
5640   assert(_stream->buffer() == _stream->current(), "invariant");
5641   assert(_class_name != nullptr, "invariant");
5642   assert(0 == _access_flags.as_unsigned_short(), "invariant");
5643 
5644   // Figure out whether we can skip format checking (matching classic VM behavior)
5645   _need_verify = Verifier::should_verify_for(_loader_data->class_loader());
5646 
5647   // synch back verification state to stream to check for truncation.
5648   stream->set_need_verify(_need_verify);
5649 
5650   parse_stream(stream, CHECK);
5651 
5652   post_process_parsed_stream(stream, _cp, CHECK);
5653 }
5654 
5655 void ClassFileParser::clear_class_metadata() {
5656   // metadata created before the instance klass is created.  Must be
5657   // deallocated if classfile parsing returns an error.
5658   _cp = nullptr;
5659   _fieldinfo_stream = nullptr;
5660   _fields_status = nullptr;
5661   _methods = nullptr;
5662   _inner_classes = nullptr;
5663   _nest_members = nullptr;
5664   _permitted_subclasses = nullptr;
5665   _loadable_descriptors = nullptr;
5666   _combined_annotations = nullptr;
5667   _class_annotations = _class_type_annotations = nullptr;
5668   _fields_annotations = _fields_type_annotations = nullptr;
5669   _record_components = nullptr;
5670   _inline_layout_info_array = nullptr;
5671 }
5672 
5673 // Destructor to clean up
5674 ClassFileParser::~ClassFileParser() {
5675   _class_name->decrement_refcount();
5676 
5677   if (_cp != nullptr) {
5678     MetadataFactory::free_metadata(_loader_data, _cp);
5679   }
5680 
5681   if (_fieldinfo_stream != nullptr) {
5682     MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5683   }
5684 
5685   if (_fields_status != nullptr) {
5686     MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5687   }
5688 
5689   if (_inline_layout_info_array != nullptr) {
5690     MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5691   }
5692 
5693   if (_methods != nullptr) {
5694     // Free methods
5695     InstanceKlass::deallocate_methods(_loader_data, _methods);
5696   }
5697 
5698   // beware of the Universe::empty_blah_array!!
5699   if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5700     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5701   }
5702 
5703   if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5704     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5705   }
5706 
5707   if (_record_components != nullptr) {
5708     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5709   }
5710 
5711   if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5712     MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5713   }
5714 
5715   if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5716     MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5717   }
5718 
5719   // Free interfaces
5720   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5721                                        _local_interfaces, _transitive_interfaces);
5722 
5723   if (_combined_annotations != nullptr) {
5724     // After all annotations arrays have been created, they are installed into the
5725     // Annotations object that will be assigned to the InstanceKlass being created.
5726 
5727     // Deallocate the Annotations object and the installed annotations arrays.
5728     _combined_annotations->deallocate_contents(_loader_data);
5729 
5730     // If the _combined_annotations pointer is non-null,
5731     // then the other annotations fields should have been cleared.
5732     assert(_class_annotations       == nullptr, "Should have been cleared");
5733     assert(_class_type_annotations  == nullptr, "Should have been cleared");
5734     assert(_fields_annotations      == nullptr, "Should have been cleared");
5735     assert(_fields_type_annotations == nullptr, "Should have been cleared");
5736   } else {
5737     // If the annotations arrays were not installed into the Annotations object,
5738     // then they have to be deallocated explicitly.
5739     MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5740     MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5741     Annotations::free_contents(_loader_data, _fields_annotations);
5742     Annotations::free_contents(_loader_data, _fields_type_annotations);
5743   }
5744 
5745   clear_class_metadata();
5746   _transitive_interfaces = nullptr;
5747   _local_interfaces = nullptr;
5748 
5749   // deallocate the klass if already created.  Don't directly deallocate, but add
5750   // to the deallocate list so that the klass is removed from the CLD::_klasses list
5751   // at a safepoint.
5752   if (_klass_to_deallocate != nullptr) {
5753     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5754   }
5755 }
5756 
5757 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5758                                    TRAPS) {
5759 
5760   assert(stream != nullptr, "invariant");
5761   assert(_class_name != nullptr, "invariant");
5762 
5763   // BEGIN STREAM PARSING
5764   stream->guarantee_more(8, CHECK);  // magic, major, minor
5765   // Magic value
5766   const u4 magic = stream->get_u4_fast();
5767   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5768                      "Incompatible magic value %u in class file %s",
5769                      magic, CHECK);
5770 
5771   // Version numbers
5772   _minor_version = stream->get_u2_fast();
5773   _major_version = stream->get_u2_fast();
5774 
5775   // Check version numbers - we check this even with verifier off
5776   verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5777 
5778   stream->guarantee_more(3, CHECK); // length, first cp tag
5779   u2 cp_size = stream->get_u2_fast();
5780 
5781   guarantee_property(
5782     cp_size >= 1, "Illegal constant pool size %u in class file %s",
5783     cp_size, CHECK);
5784 
5785   _orig_cp_size = cp_size;
5786   if (is_hidden()) { // Add a slot for hidden class name.
5787     cp_size++;
5788   }
5789 
5790   _cp = ConstantPool::allocate(_loader_data,
5791                                cp_size,
5792                                CHECK);
5793 
5794   ConstantPool* const cp = _cp;
5795 
5796   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5797 
5798   assert(cp_size == (u2)cp->length(), "invariant");
5799 
5800   // ACCESS FLAGS
5801   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
5802 
5803   u2 recognized_modifiers = JVM_RECOGNIZED_CLASS_MODIFIERS;
5804   // JVM_ACC_MODULE is defined in JDK-9 and later.
5805   if (_major_version >= JAVA_9_VERSION) {
5806     recognized_modifiers |= JVM_ACC_MODULE;
5807   }
5808 
5809   // Access flags
5810   u2 flags = stream->get_u2_fast() & recognized_modifiers;
5811 
5812   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5813     // Set abstract bit for old class files for backward compatibility
5814     flags |= JVM_ACC_ABSTRACT;
5815   }
5816 
5817   // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5818   if (!supports_inline_types()) {
5819     const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5820     const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5821     if (!is_module && !is_interface) {
5822       flags |= JVM_ACC_IDENTITY;
5823     }
5824   }
5825 
5826 
5827   // This class and superclass
5828   _this_class_index = stream->get_u2_fast();
5829   guarantee_property(
5830     valid_cp_range(_this_class_index, cp_size) &&
5831       cp->tag_at(_this_class_index).is_unresolved_klass(),
5832     "Invalid this class index %u in constant pool in class file %s",
5833     _this_class_index, CHECK);
5834 
5835   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5836   assert(class_name_in_cp != nullptr, "class_name can't be null");
5837 
5838   bool is_java_lang_Object = class_name_in_cp == vmSymbols::java_lang_Object();
5839 
5840   verify_legal_class_modifiers(flags, nullptr, is_java_lang_Object, CHECK);
5841 
5842   _access_flags.set_flags(flags);
5843 
5844   short bad_constant = class_bad_constant_seen();
5845   if (bad_constant != 0) {
5846     // Do not throw CFE until after the access_flags are checked because if
5847     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5848     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5849     return;
5850   }
5851 
5852   // Don't need to check whether this class name is legal or not.
5853   // It has been checked when constant pool is parsed.
5854   // However, make sure it is not an array type.
5855   if (_need_verify) {
5856     guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5857                        "Bad class name in class file %s",
5858                        CHECK);
5859   }
5860 
5861 #ifdef ASSERT
5862   // Basic sanity checks
5863   if (_is_hidden) {
5864     assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5865   }
5866 #endif
5867 
5868   // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5869 
5870   if (_is_hidden) {
5871     assert(_class_name != nullptr, "Unexpected null _class_name");
5872 #ifdef ASSERT
5873     if (_need_verify) {
5874       verify_legal_class_name(_class_name, CHECK);
5875     }
5876 #endif
5877 
5878   } else {
5879     // Check if name in class file matches given name
5880     if (_class_name != class_name_in_cp) {
5881       if (_class_name != vmSymbols::unknown_class_name()) {
5882         ResourceMark rm(THREAD);
5883         // Names are all known to be < 64k so we know this formatted message is not excessively large.
5884         Exceptions::fthrow(THREAD_AND_LOCATION,
5885                            vmSymbols::java_lang_NoClassDefFoundError(),
5886                            "%s (wrong name: %s)",
5887                            _class_name->as_C_string(),
5888                            class_name_in_cp->as_C_string()
5889                            );
5890         return;
5891       } else {
5892         // The class name was not known by the caller so we set it from
5893         // the value in the CP.
5894         update_class_name(class_name_in_cp);
5895       }
5896       // else nothing to do: the expected class name matches what is in the CP
5897     }
5898   }
5899 
5900   // Verification prevents us from creating names with dots in them, this
5901   // asserts that that's the case.
5902   assert(is_internal_format(_class_name), "external class name format used internally");
5903 
5904   if (!is_internal()) {
5905     LogTarget(Debug, class, preorder) lt;
5906     if (lt.is_enabled()){
5907       ResourceMark rm(THREAD);
5908       LogStream ls(lt);
5909       ls.print("%s", _class_name->as_klass_external_name());
5910       if (stream->source() != nullptr) {
5911         ls.print(" source: %s", stream->source());
5912       }
5913       ls.cr();
5914     }
5915   }
5916 
5917   // SUPERKLASS
5918   _super_class_index = stream->get_u2_fast();
5919   _super_klass = parse_super_class(cp,
5920                                    _super_class_index,
5921                                    _need_verify,
5922                                    CHECK);
5923 
5924   // Interfaces
5925   _itfs_len = stream->get_u2_fast();
5926   parse_interfaces(stream,
5927                    _itfs_len,
5928                    cp,
5929                    &_has_nonstatic_concrete_methods,
5930                    CHECK);
5931 
5932   // Fields (offsets are filled in later)
5933   parse_fields(stream,
5934                _access_flags,
5935                cp,
5936                cp_size,
5937                &_java_fields_count,
5938                CHECK);
5939 
5940   assert(_temp_field_info != nullptr, "invariant");
5941 
5942   // Methods
5943   parse_methods(stream,
5944                 is_interface(),
5945                 !is_identity_class(),
5946                 is_abstract_class(),
5947                 &_has_localvariable_table,
5948                 &_has_final_method,
5949                 &_declares_nonstatic_concrete_methods,
5950                 CHECK);
5951 
5952   assert(_methods != nullptr, "invariant");
5953 
5954   if (_declares_nonstatic_concrete_methods) {
5955     _has_nonstatic_concrete_methods = true;
5956   }
5957 
5958   // Additional attributes/annotations
5959   _parsed_annotations = new ClassAnnotationCollector();
5960   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
5961 
5962   assert(_inner_classes != nullptr, "invariant");
5963 
5964   // Finalize the Annotations metadata object,
5965   // now that all annotation arrays have been created.
5966   create_combined_annotations(CHECK);
5967 
5968   // Make sure this is the end of class file stream
5969   guarantee_property(stream->at_eos(),
5970                      "Extra bytes at the end of class file %s",
5971                      CHECK);
5972 
5973   // all bytes in stream read and parsed
5974 }
5975 
5976 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
5977   ResourceMark rm;
5978   // Construct hidden name from _class_name, "+", and &ik. Note that we can't
5979   // use a '/' because that confuses finding the class's package.  Also, can't
5980   // use an illegal char such as ';' because that causes serialization issues
5981   // and issues with hidden classes that create their own hidden classes.
5982   char addr_buf[20];
5983   if (CDSConfig::is_dumping_static_archive()) {
5984     // We want stable names for the archived hidden classes (only for static
5985     // archive for now). Spaces under default_SharedBaseAddress() will be
5986     // occupied by the archive at run time, so we know that no dynamically
5987     // loaded InstanceKlass will be placed under there.
5988     static volatile size_t counter = 0;
5989     Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
5990     size_t new_id = Atomic::add(&counter, (size_t)1);
5991     jio_snprintf(addr_buf, 20, "0x%zx", new_id);
5992   } else {
5993     jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
5994   }
5995   size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
5996   char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
5997   jio_snprintf(new_name, new_name_len, "%s+%s",
5998                _class_name->as_C_string(), addr_buf);
5999   update_class_name(SymbolTable::new_symbol(new_name));
6000 
6001   // Add a Utf8 entry containing the hidden name.
6002   assert(_class_name != nullptr, "Unexpected null _class_name");
6003   int hidden_index = _orig_cp_size; // this is an extra slot we added
6004   _cp->symbol_at_put(hidden_index, _class_name);
6005 
6006   // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6007   // We have to update the resolved_klass_index and the name_index together
6008   // so extract the existing resolved_klass_index first.
6009   CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6010   int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6011   _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6012   assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6013          "Bad name_index");
6014 }
6015 
6016 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6017                                                  ConstantPool* cp,
6018                                                  TRAPS) {
6019   assert(stream != nullptr, "invariant");
6020   assert(stream->at_eos(), "invariant");
6021   assert(cp != nullptr, "invariant");
6022   assert(_loader_data != nullptr, "invariant");
6023 
6024   if (_class_name == vmSymbols::java_lang_Object()) {
6025     guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6026         "java.lang.Object cannot implement an interface in class file %s",
6027         CHECK);
6028   }
6029   // We check super class after class file is parsed and format is checked
6030   if (_super_class_index > 0 && nullptr == _super_klass) {
6031     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6032     if (is_interface()) {
6033       // Before attempting to resolve the superclass, check for class format
6034       // errors not checked yet.
6035       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6036         "Interfaces must have java.lang.Object as superclass in class file %s",
6037         CHECK);
6038     }
6039     Handle loader(THREAD, _loader_data->class_loader());
6040     if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6041       _super_klass = vmClasses::Object_klass();
6042     } else {
6043       _super_klass = (const InstanceKlass*)
6044                        SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name,
6045                                                                super_class_name,
6046                                                                loader,
6047                                                                true,
6048                                                                CHECK);
6049     }
6050   }
6051 
6052   if (_super_klass != nullptr) {
6053     if (_super_klass->is_interface()) {
6054       classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6055       return;
6056     }
6057 
6058     if (_super_klass->is_final()) {
6059       classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6060       return;
6061     }
6062 
6063     if (EnableValhalla) {
6064       check_identity_and_value_modifiers(this, _super_klass, CHECK);
6065     }
6066 
6067     if (_super_klass->has_nonstatic_concrete_methods()) {
6068       _has_nonstatic_concrete_methods = true;
6069     }
6070   }
6071 
6072   if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6073     THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6074           err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6075                   _class_name->as_klass_external_name()));
6076   }
6077   if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_ImplicitlyConstructible) && _access_flags.is_identity_class()) {
6078     THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6079           err_msg("class %s cannot have annotation jdk.internal.vm.annotation.ImplicitlyConstructible, because it is not a value class",
6080                   _class_name->as_klass_external_name()));
6081   }
6082 
6083   // Determining is the class allows tearing or not (default is not)
6084   if (EnableValhalla && !_access_flags.is_identity_class()) {
6085     if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6086         && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6087       // Conditions above are not sufficient to determine atomicity requirements,
6088       // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6089       // Marking as not needing atomicity for now, can be updated when computing the fields layout
6090       // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6091       // the FieldLayoutBuilder, not with this _must_be_atomic field.
6092       _must_be_atomic = false;
6093     }
6094     if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_ImplicitlyConstructible)
6095         && (_super_klass == vmClasses::Object_klass() || _super_klass == vmClasses::Record_klass()
6096         || _super_klass->is_implicitly_constructible())) {
6097       _is_implicitly_constructible = true;
6098     }
6099     // Apply VM options override
6100     if (*ForceNonTearable != '\0') {
6101       // Allow a command line switch to force the same atomicity property:
6102       const char* class_name_str = _class_name->as_C_string();
6103       if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6104         _must_be_atomic = true;
6105       }
6106     }
6107   }
6108 
6109   int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6110   _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6111   if (_local_interface_indexes != nullptr) {
6112     for (int i = 0; i < _local_interface_indexes->length(); i++) {
6113       u2 interface_index = _local_interface_indexes->at(i);
6114       Klass* interf;
6115       if (cp->tag_at(interface_index).is_klass()) {
6116         interf = cp->resolved_klass_at(interface_index);
6117       } else {
6118         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
6119 
6120         // Don't need to check legal name because it's checked when parsing constant pool.
6121         // But need to make sure it's not an array type.
6122         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6123                             "Bad interface name in class file %s", CHECK);
6124 
6125         // Call resolve on the interface class name with class circularity checking
6126         interf = SystemDictionary::resolve_with_circularity_detection_or_fail(
6127                                                   _class_name,
6128                                                   unresolved_klass,
6129                                                   Handle(THREAD, _loader_data->class_loader()),
6130                                                   false,
6131                                                   CHECK);
6132       }
6133 
6134       if (!interf->is_interface()) {
6135         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6136                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
6137                           _class_name->as_klass_external_name(),
6138                           interf->external_name(),
6139                           interf->class_in_module_of_loader()));
6140       }
6141 
6142       if (EnableValhalla) {
6143         // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6144         check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6145       }
6146 
6147       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6148         _has_nonstatic_concrete_methods = true;
6149       }
6150       _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6151     }
6152   }
6153   assert(_local_interfaces != nullptr, "invariant");
6154 
6155   // Compute the transitive list of all unique interfaces implemented by this class
6156   _transitive_interfaces =
6157     compute_transitive_interfaces(_super_klass,
6158                                   _local_interfaces,
6159                                   _loader_data,
6160                                   CHECK);
6161 
6162   assert(_transitive_interfaces != nullptr, "invariant");
6163 
6164   // sort methods
6165   _method_ordering = sort_methods(_methods);
6166 
6167   _all_mirandas = new GrowableArray<Method*>(20);
6168 
6169   Handle loader(THREAD, _loader_data->class_loader());
6170   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6171                                                     &_num_miranda_methods,
6172                                                     _all_mirandas,
6173                                                     _super_klass,
6174                                                     _methods,
6175                                                     _access_flags,
6176                                                     _major_version,
6177                                                     loader,
6178                                                     _class_name,
6179                                                     _local_interfaces);
6180 
6181   // Size of Java itable (in words)
6182   _itable_size = is_interface() ? 0 :
6183     klassItable::compute_itable_size(_transitive_interfaces);
6184 
6185   assert(_parsed_annotations != nullptr, "invariant");
6186 
6187   if (EnableValhalla) {
6188     _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6189                                                    java_fields_count(),
6190                                                    CHECK);
6191     for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6192       FieldInfo fieldinfo = *it;
6193       if (fieldinfo.access_flags().is_static()) continue;  // Only non-static fields are processed at load time
6194       Symbol* sig = fieldinfo.signature(cp);
6195       if (fieldinfo.field_flags().is_null_free_inline_type()) {
6196         // Pre-load classes of null-free fields that are candidate for flattening
6197         TempNewSymbol s = Signature::strip_envelope(sig);
6198         if (s == _class_name) {
6199           THROW_MSG(vmSymbols::java_lang_ClassCircularityError(), err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6200         }
6201         log_info(class, preload)("Preloading class %s during loading of class %s. Cause: a null-free non-static field is declared with this type", s->as_C_string(), _class_name->as_C_string());
6202         Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, s, Handle(THREAD, _loader_data->class_loader()), false, THREAD);
6203         if (HAS_PENDING_EXCEPTION) {
6204           log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) failed: %s",
6205                                       s->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6206           return; // Exception is still pending
6207         }
6208         assert(klass != nullptr, "Sanity check");
6209         if (klass->access_flags().is_identity_class()) {
6210           assert(klass->is_instance_klass(), "Sanity check");
6211           ResourceMark rm(THREAD);
6212           THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6213                     err_msg("Class %s expects class %s to be a value class, but it is an identity class",
6214                     _class_name->as_C_string(),
6215                     InstanceKlass::cast(klass)->external_name()));
6216         }
6217         if (klass->is_abstract()) {
6218           assert(klass->is_instance_klass(), "Sanity check");
6219           ResourceMark rm(THREAD);
6220           THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6221                     err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
6222                     _class_name->as_C_string(),
6223                     InstanceKlass::cast(klass)->external_name()));
6224         }
6225         InlineKlass* vk = InlineKlass::cast(klass);
6226         if (!vk->is_implicitly_constructible()) {
6227           THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6228                     err_msg("class %s is not implicitly constructible and it is used in a null restricted non-static field (not supported)",
6229                     klass->name()->as_C_string()));
6230         }
6231         _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6232         log_info(class, preload)("Preloading of class %s during loading of class %s (cause: null-free non-static field) succeeded", s->as_C_string(), _class_name->as_C_string());
6233       } else if (Signature::has_envelope(sig)) {
6234         // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6235         // Those classes would be required later for the flattening of nullable inline type fields
6236         TempNewSymbol name = Signature::strip_envelope(sig);
6237         if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6238           log_info(class, preload)("Preloading class %s during loading of class %s. Cause: field type in LoadableDescriptors attribute", name->as_C_string(), _class_name->as_C_string());
6239           oop loader = loader_data()->class_loader();
6240           Klass* klass = SystemDictionary::resolve_with_circularity_detection_or_fail(_class_name, name, Handle(THREAD, loader), false, THREAD);
6241           if (klass != nullptr) {
6242             if (klass->is_inline_klass()) {
6243               _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6244               log_info(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) succeeded", name->as_C_string(), _class_name->as_C_string());
6245             } else {
6246               // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6247               log_warning(class, preload)("Preloading class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) but loaded class is not a value class", name->as_C_string(), _class_name->as_C_string());
6248             }
6249             } else {
6250             log_warning(class, preload)("Preloading of class %s during loading of class %s (cause: field type in LoadableDescriptors attribute) failed : %s",
6251                                           name->as_C_string(), _class_name->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
6252           }
6253           // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6254           if (HAS_PENDING_EXCEPTION) {
6255             CLEAR_PENDING_EXCEPTION;
6256           }
6257         }
6258       }
6259     }
6260   }
6261 
6262   _layout_info = new FieldLayoutInfo();
6263   FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6264       _parsed_annotations->is_contended(), is_inline_type(),
6265       access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6266       _must_be_atomic, _layout_info, _inline_layout_info_array);
6267   lb.build_layout();
6268   _has_inline_type_fields = _layout_info->_has_inline_fields;
6269 
6270   int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6271   _fieldinfo_stream =
6272     FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6273                                             injected_fields_count, loader_data(), CHECK);
6274 
6275   _fields_status =
6276     MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6277                                             FieldStatus(0), CHECK);
6278 }
6279 
6280 void ClassFileParser::set_klass(InstanceKlass* klass) {
6281 
6282 #ifdef ASSERT
6283   if (klass != nullptr) {
6284     assert(nullptr == _klass, "leaking?");
6285   }
6286 #endif
6287 
6288   _klass = klass;
6289 }
6290 
6291 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6292 
6293 #ifdef ASSERT
6294   if (klass != nullptr) {
6295     assert(nullptr == _klass_to_deallocate, "leaking?");
6296   }
6297 #endif
6298 
6299   _klass_to_deallocate = klass;
6300 }
6301 
6302 // Caller responsible for ResourceMark
6303 // clone stream with rewound position
6304 const ClassFileStream* ClassFileParser::clone_stream() const {
6305   assert(_stream != nullptr, "invariant");
6306 
6307   return _stream->clone();
6308 }
6309 
6310 ReferenceType ClassFileParser::super_reference_type() const {
6311   return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6312 }
6313 
6314 bool ClassFileParser::is_instance_ref_klass() const {
6315   // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6316   // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6317   // klass requiring special treatment in ref-processing. The abstract
6318   // j.l.r.Reference cannot be instantiated so doesn't partake in
6319   // ref-processing.
6320   return is_java_lang_ref_Reference_subclass();
6321 }
6322 
6323 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6324   if (_super_klass == nullptr) {
6325     return false;
6326   }
6327 
6328   if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6329     // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6330     return true;
6331   }
6332 
6333   return _super_klass->reference_type() != REF_NONE;
6334 }
6335 
6336 // Returns true if the future Klass will need to be addressable with a narrow Klass ID.
6337 bool ClassFileParser::klass_needs_narrow_id() const {
6338   // Classes that are never instantiated need no narrow Klass Id, since the
6339   // only point of having a narrow id is to put it into an object header. Keeping
6340   // never instantiated classes out of class space lessens the class space pressure.
6341   // For more details, see JDK-8338526.
6342   return !is_interface() && !is_abstract();
6343 }
6344 
6345 // ----------------------------------------------------------------------------
6346 // debugging
6347 
6348 #ifdef ASSERT
6349 
6350 // return true if class_name contains no '.' (internal format is '/')
6351 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6352   if (class_name != nullptr) {
6353     ResourceMark rm;
6354     char* name = class_name->as_C_string();
6355     return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6356   } else {
6357     return true;
6358   }
6359 }
6360 
6361 #endif