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 "cds/cdsConfig.hpp"
  26 #include "classfile/classFileParser.hpp"
  27 #include "classfile/classFileStream.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/classLoaderData.inline.hpp"
  30 #include "classfile/classLoadInfo.hpp"
  31 #include "classfile/defaultMethods.hpp"
  32 #include "classfile/fieldLayoutBuilder.hpp"
  33 #include "classfile/javaClasses.inline.hpp"
  34 #include "classfile/moduleEntry.hpp"
  35 #include "classfile/packageEntry.hpp"
  36 #include "classfile/symbolTable.hpp"
  37 #include "classfile/systemDictionary.hpp"
  38 #include "classfile/verificationType.hpp"
  39 #include "classfile/verifier.hpp"
  40 #include "classfile/vmClasses.hpp"
  41 #include "classfile/vmSymbols.hpp"
  42 #include "jvm.h"
  43 #include "logging/log.hpp"
  44 #include "logging/logStream.hpp"
  45 #include "memory/allocation.hpp"
  46 #include "memory/metadataFactory.hpp"
  47 #include "memory/oopFactory.hpp"
  48 #include "memory/resourceArea.hpp"
  49 #include "memory/universe.hpp"
  50 #include "oops/annotations.hpp"
  51 #include "oops/bsmAttribute.inline.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/exceptions.hpp"
  84 #include "utilities/formatBuffer.hpp"
  85 #include "utilities/globalDefinitions.hpp"
  86 #include "utilities/growableArray.hpp"
  87 #include "utilities/hashTable.hpp"
  88 #include "utilities/macros.hpp"
  89 #include "utilities/ostream.hpp"
  90 #include "utilities/stringUtils.hpp"
  91 #include "utilities/utf8.hpp"
  92 #if INCLUDE_CDS
  93 #include "classfile/systemDictionaryShared.hpp"
  94 #endif
  95 
  96 // We generally try to create the oops directly when parsing, rather than
  97 // allocating temporary data structures and copying the bytes twice. A
  98 // temporary area is only needed when parsing utf8 entries in the constant
  99 // pool and when parsing line number tables.
 100 
 101 // We add assert in debug mode when class format is not checked.
 102 
 103 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
 104 #define JAVA_MIN_SUPPORTED_VERSION        45
 105 #define JAVA_PREVIEW_MINOR_VERSION        65535
 106 
 107 // Used for two backward compatibility reasons:
 108 // - to check for new additions to the class file format in JDK1.5
 109 // - to check for bug fixes in the format checker in JDK1.5
 110 #define JAVA_1_5_VERSION                  49
 111 
 112 // Used for backward compatibility reasons:
 113 // - to check for javac bug fixes that happened after 1.5
 114 // - also used as the max version when running in jdk6
 115 #define JAVA_6_VERSION                    50
 116 
 117 // Used for backward compatibility reasons:
 118 // - to disallow argument and require ACC_STATIC for <clinit> methods
 119 #define JAVA_7_VERSION                    51
 120 
 121 // Extension method support.
 122 #define JAVA_8_VERSION                    52
 123 
 124 #define JAVA_9_VERSION                    53
 125 
 126 #define JAVA_10_VERSION                   54
 127 
 128 #define JAVA_11_VERSION                   55
 129 
 130 #define JAVA_12_VERSION                   56
 131 
 132 #define JAVA_13_VERSION                   57
 133 
 134 #define JAVA_14_VERSION                   58
 135 
 136 #define JAVA_15_VERSION                   59
 137 
 138 #define JAVA_16_VERSION                   60
 139 
 140 #define JAVA_17_VERSION                   61
 141 
 142 #define JAVA_18_VERSION                   62
 143 
 144 #define JAVA_19_VERSION                   63
 145 
 146 #define JAVA_20_VERSION                   64
 147 
 148 #define JAVA_21_VERSION                   65
 149 
 150 #define JAVA_22_VERSION                   66
 151 
 152 #define JAVA_23_VERSION                   67
 153 
 154 #define JAVA_24_VERSION                   68
 155 
 156 #define JAVA_25_VERSION                   69
 157 
 158 #define JAVA_26_VERSION                   70
 159 
 160 #define JAVA_27_VERSION                   71
 161 
 162 #define CONSTANT_CLASS_DESCRIPTORS        71
 163 
 164 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) {
 165   assert((bad_constant == JVM_CONSTANT_Module ||
 166           bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION,
 167          "Unexpected bad constant pool entry");
 168   if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant;
 169 }
 170 
 171 void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream,
 172                                                   ConstantPool* cp,
 173                                                   const int length,
 174                                                   TRAPS) {
 175   assert(stream != nullptr, "invariant");
 176   assert(cp != nullptr, "invariant");
 177 
 178   // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize
 179   // this function (_current can be allocated in a register, with scalar
 180   // replacement of aggregates). The _current pointer is copied back to
 181   // stream() when this function returns. DON'T call another method within
 182   // this method that uses stream().
 183   const ClassFileStream cfs1 = *stream;
 184   const ClassFileStream* const cfs = &cfs1;
 185 
 186   DEBUG_ONLY(const u1* const old_current = stream->current();)
 187 
 188   // Used for batching symbol allocations.
 189   const char* names[SymbolTable::symbol_alloc_batch_size];
 190   int lengths[SymbolTable::symbol_alloc_batch_size];
 191   int indices[SymbolTable::symbol_alloc_batch_size];
 192   unsigned int hashValues[SymbolTable::symbol_alloc_batch_size];
 193   int names_count = 0;
 194 
 195   // parsing  Index 0 is unused
 196   for (int index = 1; index < length; index++) {
 197     // Each of the following case guarantees one more byte in the stream
 198     // for the following tag or the access_flags following constant pool,
 199     // so we don't need bounds-check for reading tag.
 200     const u1 tag = cfs->get_u1_fast();
 201     switch (tag) {
 202       case JVM_CONSTANT_Class: {
 203         cfs->guarantee_more(3, CHECK);  // name_index, tag/access_flags
 204         const u2 name_index = cfs->get_u2_fast();
 205         cp->klass_index_at_put(index, name_index);
 206         break;
 207       }
 208       case JVM_CONSTANT_Fieldref: {
 209         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 210         const u2 class_index = cfs->get_u2_fast();
 211         const u2 name_and_type_index = cfs->get_u2_fast();
 212         cp->field_at_put(index, class_index, name_and_type_index);
 213         break;
 214       }
 215       case JVM_CONSTANT_Methodref: {
 216         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 217         const u2 class_index = cfs->get_u2_fast();
 218         const u2 name_and_type_index = cfs->get_u2_fast();
 219         cp->method_at_put(index, class_index, name_and_type_index);
 220         break;
 221       }
 222       case JVM_CONSTANT_InterfaceMethodref: {
 223         cfs->guarantee_more(5, CHECK);  // class_index, name_and_type_index, tag/access_flags
 224         const u2 class_index = cfs->get_u2_fast();
 225         const u2 name_and_type_index = cfs->get_u2_fast();
 226         cp->interface_method_at_put(index, class_index, name_and_type_index);
 227         break;
 228       }
 229       case JVM_CONSTANT_String : {
 230         cfs->guarantee_more(3, CHECK);  // string_index, tag/access_flags
 231         const u2 string_index = cfs->get_u2_fast();
 232         cp->string_index_at_put(index, string_index);
 233         break;
 234       }
 235       case JVM_CONSTANT_MethodHandle :
 236       case JVM_CONSTANT_MethodType: {
 237         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 238           classfile_parse_error(
 239             "Class file version does not support constant tag %u in class file %s",
 240             tag, THREAD);
 241           return;
 242         }
 243         if (tag == JVM_CONSTANT_MethodHandle) {
 244           cfs->guarantee_more(4, CHECK);  // ref_kind, method_index, tag/access_flags
 245           const u1 ref_kind = cfs->get_u1_fast();
 246           const u2 method_index = cfs->get_u2_fast();
 247           cp->method_handle_index_at_put(index, ref_kind, method_index);
 248         }
 249         else if (tag == JVM_CONSTANT_MethodType) {
 250           cfs->guarantee_more(3, CHECK);  // signature_index, tag/access_flags
 251           const u2 signature_index = cfs->get_u2_fast();
 252           cp->method_type_index_at_put(index, signature_index);
 253         }
 254         else {
 255           ShouldNotReachHere();
 256         }
 257         break;
 258       }
 259       case JVM_CONSTANT_Dynamic : {
 260         if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) {
 261           classfile_parse_error(
 262               "Class file version does not support constant tag %u in class file %s",
 263               tag, THREAD);
 264           return;
 265         }
 266         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 267         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 268         const u2 name_and_type_index = cfs->get_u2_fast();
 269         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 270           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 271         }
 272         cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index);
 273         break;
 274       }
 275       case JVM_CONSTANT_InvokeDynamic : {
 276         if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
 277           classfile_parse_error(
 278               "Class file version does not support constant tag %u in class file %s",
 279               tag, THREAD);
 280           return;
 281         }
 282         cfs->guarantee_more(5, CHECK);  // bsm_index, nt, tag/access_flags
 283         const u2 bootstrap_specifier_index = cfs->get_u2_fast();
 284         const u2 name_and_type_index = cfs->get_u2_fast();
 285         if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) {
 286           _max_bootstrap_specifier_index = (int) bootstrap_specifier_index;  // collect for later
 287         }
 288         cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index);
 289         break;
 290       }
 291       case JVM_CONSTANT_Integer: {
 292         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 293         const u4 bytes = cfs->get_u4_fast();
 294         cp->int_at_put(index, (jint)bytes);
 295         break;
 296       }
 297       case JVM_CONSTANT_Float: {
 298         cfs->guarantee_more(5, CHECK);  // bytes, tag/access_flags
 299         const u4 bytes = cfs->get_u4_fast();
 300         cp->float_at_put(index, *(jfloat*)&bytes);
 301         break;
 302       }
 303       case JVM_CONSTANT_Long: {
 304         // A mangled type might cause you to overrun allocated memory
 305         guarantee_property(index + 1 < length,
 306                            "Invalid constant pool entry %u in class file %s",
 307                            index,
 308                            CHECK);
 309         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 310         const u8 bytes = cfs->get_u8_fast();
 311         cp->long_at_put(index, bytes);
 312         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 313         break;
 314       }
 315       case JVM_CONSTANT_Double: {
 316         // A mangled type might cause you to overrun allocated memory
 317         guarantee_property(index+1 < length,
 318                            "Invalid constant pool entry %u in class file %s",
 319                            index,
 320                            CHECK);
 321         cfs->guarantee_more(9, CHECK);  // bytes, tag/access_flags
 322         const u8 bytes = cfs->get_u8_fast();
 323         cp->double_at_put(index, *(jdouble*)&bytes);
 324         index++;   // Skip entry following eigth-byte constant, see JVM book p. 98
 325         break;
 326       }
 327       case JVM_CONSTANT_NameAndType: {
 328         cfs->guarantee_more(5, CHECK);  // name_index, signature_index, tag/access_flags
 329         const u2 name_index = cfs->get_u2_fast();
 330         const u2 signature_index = cfs->get_u2_fast();
 331         cp->name_and_type_at_put(index, name_index, signature_index);
 332         break;
 333       }
 334       case JVM_CONSTANT_Utf8 : {
 335         cfs->guarantee_more(2, CHECK);  // utf8_length
 336         u2  utf8_length = cfs->get_u2_fast();
 337         const u1* utf8_buffer = cfs->current();
 338         assert(utf8_buffer != nullptr, "null utf8 buffer");
 339         // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward.
 340         cfs->guarantee_more(utf8_length+1, CHECK);  // utf8 string, tag/access_flags
 341         cfs->skip_u1_fast(utf8_length);
 342 
 343         // Before storing the symbol, make sure it's legal
 344         if (_need_verify) {
 345           verify_legal_utf8(utf8_buffer, utf8_length, CHECK);
 346         }
 347 
 348         unsigned int hash;
 349         Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer,
 350                                                         utf8_length,
 351                                                         hash);
 352         if (result == nullptr) {
 353           names[names_count] = (const char*)utf8_buffer;
 354           lengths[names_count] = utf8_length;
 355           indices[names_count] = index;
 356           hashValues[names_count++] = hash;
 357           if (names_count == SymbolTable::symbol_alloc_batch_size) {
 358             SymbolTable::new_symbols(_loader_data,
 359                                      constantPoolHandle(THREAD, cp),
 360                                      names_count,
 361                                      names,
 362                                      lengths,
 363                                      indices,
 364                                      hashValues);
 365             names_count = 0;
 366           }
 367         } else {
 368           cp->symbol_at_put(index, result);
 369         }
 370         break;
 371       }
 372       case JVM_CONSTANT_Module:
 373       case JVM_CONSTANT_Package: {
 374         // Record that an error occurred in these two cases but keep parsing so
 375         // that ACC_Module can be checked for in the access_flags.  Need to
 376         // throw NoClassDefFoundError in that case.
 377         if (_major_version >= JAVA_9_VERSION) {
 378           cfs->guarantee_more(3, CHECK);
 379           cfs->get_u2_fast();
 380           set_class_bad_constant_seen(tag);
 381           break;
 382         }
 383       }
 384       default: {
 385         classfile_parse_error("Unknown constant tag %u in class file %s",
 386                               tag,
 387                               THREAD);
 388         return;
 389       }
 390     } // end of switch(tag)
 391   } // end of for
 392 
 393   // Allocate the remaining symbols
 394   if (names_count > 0) {
 395     SymbolTable::new_symbols(_loader_data,
 396                              constantPoolHandle(THREAD, cp),
 397                              names_count,
 398                              names,
 399                              lengths,
 400                              indices,
 401                              hashValues);
 402   }
 403 
 404   // Copy _current pointer of local copy back to stream.
 405   assert(stream->current() == old_current, "non-exclusive use of stream");
 406   stream->set_current(cfs1.current());
 407 
 408 }
 409 
 410 static inline bool valid_cp_range(int index, int length) {
 411   return (index > 0 && index < length);
 412 }
 413 
 414 static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) {
 415   assert(cp != nullptr, "invariant");
 416   if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) {
 417     return cp->symbol_at(index);
 418   }
 419   return nullptr;
 420 }
 421 
 422 void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream,
 423                                          ConstantPool* const cp,
 424                                          const int length,
 425                                          TRAPS) {
 426   assert(cp != nullptr, "invariant");
 427   assert(stream != nullptr, "invariant");
 428 
 429   // parsing constant pool entries
 430   parse_constant_pool_entries(stream, cp, length, CHECK);
 431   if (class_bad_constant_seen() != 0) {
 432     // a bad CP entry has been detected previously so stop parsing and just return.
 433     return;
 434   }
 435 
 436   int index = 1;  // declared outside of loops for portability
 437   int num_klasses = 0;
 438 
 439   // first verification pass - validate cross references
 440   // and fixup class and string constants
 441   for (index = 1; index < length; index++) {          // Index 0 is unused
 442     const jbyte tag = cp->tag_at(index).value();
 443     switch (tag) {
 444       case JVM_CONSTANT_Class: {
 445         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 446         break;
 447       }
 448       case JVM_CONSTANT_Fieldref:
 449         // fall through
 450       case JVM_CONSTANT_Methodref:
 451         // fall through
 452       case JVM_CONSTANT_InterfaceMethodref: {
 453         if (!_need_verify) break;
 454         const int klass_ref_index = cp->uncached_klass_ref_index_at(index);
 455         const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index);
 456         guarantee_property(valid_klass_reference_at(klass_ref_index),
 457                        "Invalid constant pool index %u in class file %s",
 458                        klass_ref_index, CHECK);
 459         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 460           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 461           "Invalid constant pool index %u in class file %s",
 462           name_and_type_ref_index, CHECK);
 463         break;
 464       }
 465       case JVM_CONSTANT_String: {
 466         ShouldNotReachHere();     // Only JVM_CONSTANT_StringIndex should be present
 467         break;
 468       }
 469       case JVM_CONSTANT_Integer:
 470         break;
 471       case JVM_CONSTANT_Float:
 472         break;
 473       case JVM_CONSTANT_Long:
 474       case JVM_CONSTANT_Double: {
 475         index++;
 476         guarantee_property(
 477           (index < length && cp->tag_at(index).is_invalid()),
 478           "Improper constant pool long/double index %u in class file %s",
 479           index, CHECK);
 480         break;
 481       }
 482       case JVM_CONSTANT_NameAndType: {
 483         if (!_need_verify) break;
 484         const int name_ref_index = cp->name_ref_index_at(index);
 485         const int signature_ref_index = cp->signature_ref_index_at(index);
 486         guarantee_property(valid_symbol_at(name_ref_index),
 487           "Invalid constant pool index %u in class file %s",
 488           name_ref_index, CHECK);
 489         guarantee_property(valid_symbol_at(signature_ref_index),
 490           "Invalid constant pool index %u in class file %s",
 491           signature_ref_index, CHECK);
 492         break;
 493       }
 494       case JVM_CONSTANT_Utf8:
 495         break;
 496       case JVM_CONSTANT_UnresolvedClass:         // fall-through
 497       case JVM_CONSTANT_UnresolvedClassInError: {
 498         ShouldNotReachHere();     // Only JVM_CONSTANT_ClassIndex should be present
 499         break;
 500       }
 501       case JVM_CONSTANT_ClassIndex: {
 502         const int class_index = cp->klass_index_at(index);
 503         guarantee_property(valid_symbol_at(class_index),
 504           "Invalid constant pool index %u in class file %s",
 505           class_index, CHECK);
 506 
 507         Symbol* const name = cp->symbol_at(class_index);
 508         const unsigned int name_len = name->utf8_length();
 509         cp->unresolved_klass_at_put(index, class_index, num_klasses++);
 510         break;
 511       }
 512       case JVM_CONSTANT_StringIndex: {
 513         const int string_index = cp->string_index_at(index);
 514         guarantee_property(valid_symbol_at(string_index),
 515           "Invalid constant pool index %u in class file %s",
 516           string_index, CHECK);
 517         Symbol* const sym = cp->symbol_at(string_index);
 518         cp->unresolved_string_at_put(index, sym);
 519         break;
 520       }
 521       case JVM_CONSTANT_MethodHandle: {
 522         const int ref_index = cp->method_handle_index_at(index);
 523         guarantee_property(valid_cp_range(ref_index, length),
 524           "Invalid constant pool index %u in class file %s",
 525           ref_index, CHECK);
 526         const constantTag tag = cp->tag_at(ref_index);
 527         const int ref_kind = cp->method_handle_ref_kind_at(index);
 528 
 529         switch (ref_kind) {
 530           case JVM_REF_getField:
 531           case JVM_REF_getStatic:
 532           case JVM_REF_putField:
 533           case JVM_REF_putStatic: {
 534             guarantee_property(
 535               tag.is_field(),
 536               "Invalid constant pool index %u in class file %s (not a field)",
 537               ref_index, CHECK);
 538             break;
 539           }
 540           case JVM_REF_invokeVirtual:
 541           case JVM_REF_newInvokeSpecial: {
 542             guarantee_property(
 543               tag.is_method(),
 544               "Invalid constant pool index %u in class file %s (not a method)",
 545               ref_index, CHECK);
 546             break;
 547           }
 548           case JVM_REF_invokeStatic:
 549           case JVM_REF_invokeSpecial: {
 550             guarantee_property(
 551               tag.is_method() ||
 552               ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()),
 553               "Invalid constant pool index %u in class file %s (not a method)",
 554               ref_index, CHECK);
 555             break;
 556           }
 557           case JVM_REF_invokeInterface: {
 558             guarantee_property(
 559               tag.is_interface_method(),
 560               "Invalid constant pool index %u in class file %s (not an interface method)",
 561               ref_index, CHECK);
 562             break;
 563           }
 564           default: {
 565             classfile_parse_error(
 566               "Bad method handle kind at constant pool index %u in class file %s",
 567               index, THREAD);
 568             return;
 569           }
 570         } // switch(refkind)
 571         // Keep the ref_index unchanged.  It will be indirected at link-time.
 572         break;
 573       } // case MethodHandle
 574       case JVM_CONSTANT_MethodType: {
 575         const int ref_index = cp->method_type_index_at(index);
 576         guarantee_property(valid_symbol_at(ref_index),
 577           "Invalid constant pool index %u in class file %s",
 578           ref_index, CHECK);
 579         break;
 580       }
 581       case JVM_CONSTANT_Dynamic: {
 582         const int name_and_type_ref_index =
 583           cp->bootstrap_name_and_type_ref_index_at(index);
 584 
 585         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 586           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 587           "Invalid constant pool index %u in class file %s",
 588           name_and_type_ref_index, CHECK);
 589         // bootstrap specifier index must be checked later,
 590         // when BootstrapMethods attr is available
 591 
 592         // Mark the constant pool as having a CONSTANT_Dynamic_info structure
 593         cp->set_has_dynamic_constant();
 594         break;
 595       }
 596       case JVM_CONSTANT_InvokeDynamic: {
 597         const int name_and_type_ref_index =
 598           cp->bootstrap_name_and_type_ref_index_at(index);
 599 
 600         guarantee_property(valid_cp_range(name_and_type_ref_index, length) &&
 601           cp->tag_at(name_and_type_ref_index).is_name_and_type(),
 602           "Invalid constant pool index %u in class file %s",
 603           name_and_type_ref_index, CHECK);
 604         // bootstrap specifier index must be checked later,
 605         // when BootstrapMethods attr is available
 606         break;
 607       }
 608       default: {
 609         fatal("bad constant pool tag value %u", cp->tag_at(index).value());
 610         ShouldNotReachHere();
 611         break;
 612       }
 613     } // switch(tag)
 614   } // end of for
 615 
 616   cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK);
 617 
 618   if (!_need_verify) {
 619     return;
 620   }
 621 
 622   // second verification pass - checks the strings are of the right format.
 623   // but not yet to the other entries
 624   for (index = 1; index < length; index++) {
 625     const jbyte tag = cp->tag_at(index).value();
 626     switch (tag) {
 627       case JVM_CONSTANT_UnresolvedClass: {
 628         const Symbol* const class_name = cp->klass_name_at(index);
 629         // check the name
 630         verify_legal_class_name(class_name, CHECK);
 631         break;
 632       }
 633       case JVM_CONSTANT_NameAndType: {
 634         if (_need_verify) {
 635           const int sig_index = cp->signature_ref_index_at(index);
 636           const int name_index = cp->name_ref_index_at(index);
 637           const Symbol* const name = cp->symbol_at(name_index);
 638           const Symbol* const sig = cp->symbol_at(sig_index);
 639           guarantee_property(sig->utf8_length() != 0,
 640             "Illegal zero length constant pool entry at %d in class %s",
 641             sig_index, CHECK);
 642           guarantee_property(name->utf8_length() != 0,
 643             "Illegal zero length constant pool entry at %d in class %s",
 644             name_index, CHECK);
 645 
 646           if (Signature::is_method(sig)) {
 647             // Format check method name and signature
 648             verify_legal_method_name(name, CHECK);
 649             verify_legal_method_signature(name, sig, CHECK);
 650           } else {
 651             // Format check field name and signature
 652             verify_legal_field_name(name, CHECK);
 653             verify_legal_field_signature(name, sig, CHECK);
 654           }
 655         }
 656         break;
 657       }
 658       case JVM_CONSTANT_Dynamic: {
 659         const int name_and_type_ref_index =
 660           cp->uncached_name_and_type_ref_index_at(index);
 661         // already verified to be utf8
 662         const int name_ref_index =
 663           cp->name_ref_index_at(name_and_type_ref_index);
 664         // already verified to be utf8
 665         const int signature_ref_index =
 666           cp->signature_ref_index_at(name_and_type_ref_index);
 667         const Symbol* const name = cp->symbol_at(name_ref_index);
 668         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 669         if (_need_verify) {
 670           // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info.
 671           // Need only to be sure signature is the right type.
 672           if (Signature::is_method(signature)) {
 673             throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK);
 674           }
 675         }
 676         break;
 677       }
 678       case JVM_CONSTANT_InvokeDynamic:
 679       case JVM_CONSTANT_Fieldref:
 680       case JVM_CONSTANT_Methodref:
 681       case JVM_CONSTANT_InterfaceMethodref: {
 682         const int name_and_type_ref_index =
 683           cp->uncached_name_and_type_ref_index_at(index);
 684         // already verified to be utf8
 685         const int name_ref_index =
 686           cp->name_ref_index_at(name_and_type_ref_index);
 687         // already verified to be utf8
 688         const int signature_ref_index =
 689           cp->signature_ref_index_at(name_and_type_ref_index);
 690         const Symbol* const name = cp->symbol_at(name_ref_index);
 691         const Symbol* const signature = cp->symbol_at(signature_ref_index);
 692         if (tag == JVM_CONSTANT_Fieldref) {
 693           if (_need_verify) {
 694             // Field name and signature are verified above, when iterating NameAndType_info.
 695             // Need only to be sure signature is non-zero length and the right type.
 696             if (Signature::is_method(signature)) {
 697               throwIllegalSignature("Field", name, signature, CHECK);
 698             }
 699           }
 700         } else {
 701           if (_need_verify) {
 702             // Method name and signature are individually verified above, when iterating
 703             // NameAndType_info.  Need to check here that signature is non-zero length and
 704             // the right type.
 705             if (!Signature::is_method(signature)) {
 706               throwIllegalSignature("Method", name, signature, CHECK);
 707             }
 708           }
 709           // If a class method name begins with '<', it must be "<init>" and have void signature.
 710           const unsigned int name_len = name->utf8_length();
 711           if (tag == JVM_CONSTANT_Methodref && name_len != 0 &&
 712               name->char_at(0) == JVM_SIGNATURE_SPECIAL) {
 713             if (name != vmSymbols::object_initializer_name()) {
 714               classfile_parse_error(
 715                 "Bad method name at constant pool index %u in class file %s",
 716                 name_ref_index, THREAD);
 717               return;
 718             } else if (!Signature::is_void_method(signature)) {  // must have void signature.
 719               throwIllegalSignature("Method", name, signature, CHECK);
 720             }
 721           }
 722         }
 723         break;
 724       }
 725       case JVM_CONSTANT_MethodHandle: {
 726         const int ref_index = cp->method_handle_index_at(index);
 727         const int ref_kind = cp->method_handle_ref_kind_at(index);
 728         switch (ref_kind) {
 729           case JVM_REF_invokeVirtual:
 730           case JVM_REF_invokeStatic:
 731           case JVM_REF_invokeSpecial:
 732           case JVM_REF_newInvokeSpecial: {
 733             const int name_and_type_ref_index =
 734               cp->uncached_name_and_type_ref_index_at(ref_index);
 735             const int name_ref_index =
 736               cp->name_ref_index_at(name_and_type_ref_index);
 737             const Symbol* const name = cp->symbol_at(name_ref_index);
 738 
 739             if (name != vmSymbols::object_initializer_name()) { // !<init>
 740               if (ref_kind == JVM_REF_newInvokeSpecial) {
 741                 classfile_parse_error(
 742                   "Bad constructor name at constant pool index %u in class file %s",
 743                     name_ref_index, THREAD);
 744                 return;
 745               }
 746             } else { // <init>
 747               // The allowed invocation mode of <init> depends on its signature.
 748               // This test corresponds to verify_invoke_instructions in the verifier.
 749               const int signature_ref_index =
 750                 cp->signature_ref_index_at(name_and_type_ref_index);
 751               const Symbol* const signature = cp->symbol_at(signature_ref_index);
 752               if (signature->is_void_method_signature()
 753                   && ref_kind == JVM_REF_newInvokeSpecial) {
 754                 // OK, could be a constructor call
 755               } else {
 756                 classfile_parse_error(
 757                   "Bad method name at constant pool index %u in class file %s",
 758                   name_ref_index, THREAD);
 759                 return;
 760               }
 761             }
 762             break;
 763           }
 764           // Other ref_kinds are already fully checked in previous pass.
 765         } // switch(ref_kind)
 766         break;
 767       }
 768       case JVM_CONSTANT_MethodType: {
 769         const Symbol* const no_name = vmSymbols::type_name(); // place holder
 770         const Symbol* const signature = cp->method_type_signature_at(index);
 771         verify_legal_method_signature(no_name, signature, CHECK);
 772         break;
 773       }
 774       case JVM_CONSTANT_Utf8: {
 775         assert(cp->symbol_at(index)->refcount() != 0, "count corrupted");
 776       }
 777     }  // switch(tag)
 778   }  // end of for
 779 }
 780 
 781 class NameSigHash: public ResourceObj {
 782  public:
 783   const Symbol*       _name;       // name
 784   const Symbol*       _sig;        // signature
 785 
 786   static const int HASH_ROW_SIZE = 256;
 787 
 788   NameSigHash(Symbol* name, Symbol* sig) :
 789     _name(name),
 790     _sig(sig) {}
 791 
 792   static unsigned int hash(NameSigHash const& namesig) {
 793     return namesig._name->identity_hash() ^ namesig._sig->identity_hash();
 794   }
 795 
 796   static bool equals(NameSigHash const& e0, NameSigHash const& e1) {
 797     return (e0._name == e1._name) &&
 798           (e0._sig  == e1._sig);
 799   }
 800 };
 801 
 802 using NameSigHashtable = HashTable<NameSigHash, int,
 803                                            NameSigHash::HASH_ROW_SIZE,
 804                                            AnyObj::RESOURCE_AREA, mtInternal,
 805                                            &NameSigHash::hash, &NameSigHash::equals>;
 806 
 807 static void check_identity_and_value_modifiers(ClassFileParser* current, const InstanceKlass* super_type, TRAPS) {
 808   assert(super_type != nullptr,"Method doesn't support null super type");
 809   if (super_type->access_flags().is_identity_class() && !current->access_flags().is_identity_class()
 810       && super_type->name() != vmSymbols::java_lang_Object()) {
 811       THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
 812                 err_msg("Value type %s has an identity type as supertype",
 813                 current->class_name()->as_klass_external_name()));
 814   }
 815 }
 816 
 817 void ClassFileParser::parse_interfaces(const ClassFileStream* stream,
 818                                        int itfs_len,
 819                                        ConstantPool* cp,
 820                                        bool* const has_nonstatic_concrete_methods,
 821                                        // FIXME: lots of these functions
 822                                        // declare their parameters as const,
 823                                        // which adds only noise to the code.
 824                                        // Remove the spurious const modifiers.
 825                                        // Many are of the form "const int x"
 826                                        // or "T* const x".
 827                                        TRAPS) {
 828   assert(stream != nullptr, "invariant");
 829   assert(cp != nullptr, "invariant");
 830   assert(has_nonstatic_concrete_methods != nullptr, "invariant");
 831 
 832   if (itfs_len == 0) {
 833     _local_interfaces = Universe::the_empty_instance_klass_array();
 834 
 835   } else {
 836     assert(itfs_len > 0, "only called for len>0");
 837     _local_interface_indexes = new GrowableArray<u2>(itfs_len);
 838     int index = 0;

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

 841       guarantee_property(
 842         valid_klass_reference_at(interface_index),
 843         "Interface name has bad constant pool index %u in class file %s",
 844         interface_index, CHECK);
 845       _local_interface_indexes->at_put_grow(index, interface_index);




























 846     }
 847 
 848     if (!_need_verify || itfs_len <= 1) {
 849       return;
 850     }
 851 
 852     // Check if there's any duplicates in interfaces
 853     ResourceMark rm(THREAD);
 854     // Set containing interface names
 855     HashTable<Symbol*, int>* interface_names = new HashTable<Symbol*, int>();
 856     for (index = 0; index < itfs_len; index++) {
 857       Symbol* interface_name = cp->klass_name_at(_local_interface_indexes->at(index));

 858       // If no duplicates, add (name, nullptr) in hashtable interface_names.
 859       if (!interface_names->put(interface_name, 0)) {
 860         classfile_parse_error("Duplicate interface name \"%s\" in class file %s",
 861                                interface_name->as_C_string(), THREAD);
 862         return;
 863       }
 864     }
 865   }
 866 }
 867 
 868 void ClassFileParser::verify_constantvalue(const ConstantPool* const cp,
 869                                            int constantvalue_index,
 870                                            int signature_index,
 871                                            TRAPS) const {
 872   // Make sure the constant pool entry is of a type appropriate to this field
 873   guarantee_property(
 874     (constantvalue_index > 0 &&
 875       constantvalue_index < cp->length()),
 876     "Bad initial value index %u in ConstantValue attribute in class file %s",
 877     constantvalue_index, CHECK);
 878 
 879   const constantTag value_type = cp->tag_at(constantvalue_index);
 880   switch(cp->basic_type_for_signature_at(signature_index)) {
 881     case T_LONG: {
 882       guarantee_property(value_type.is_long(),
 883                          "Inconsistent constant value type in class file %s",
 884                          CHECK);
 885       break;
 886     }
 887     case T_FLOAT: {
 888       guarantee_property(value_type.is_float(),
 889                          "Inconsistent constant value type in class file %s",
 890                          CHECK);
 891       break;
 892     }
 893     case T_DOUBLE: {
 894       guarantee_property(value_type.is_double(),
 895                          "Inconsistent constant value type in class file %s",
 896                          CHECK);
 897       break;
 898     }
 899     case T_BYTE:
 900     case T_CHAR:
 901     case T_SHORT:
 902     case T_BOOLEAN:
 903     case T_INT: {
 904       guarantee_property(value_type.is_int(),
 905                          "Inconsistent constant value type in class file %s",
 906                          CHECK);
 907       break;
 908     }
 909     case T_OBJECT: {
 910       guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;")
 911                          && value_type.is_string()),
 912                          "Bad string initial value in class file %s",
 913                          CHECK);
 914       break;
 915     }
 916     default: {
 917       classfile_parse_error("Unable to set initial value %u in class file %s",
 918                              constantvalue_index,
 919                              THREAD);
 920     }
 921   }
 922 }
 923 
 924 class AnnotationCollector : public ResourceObj{
 925 public:
 926   enum Location { _in_field, _in_method, _in_class };
 927   enum ID {
 928     _unknown = 0,
 929     _method_CallerSensitive,
 930     _method_ForceInline,
 931     _method_DontInline,
 932     _method_ChangesCurrentThread,
 933     _method_JvmtiHideEvents,
 934     _method_JvmtiMountTransition,
 935     _method_InjectedProfile,
 936     _method_LambdaForm_Compiled,
 937     _method_Hidden,
 938     _method_Scoped,
 939     _method_IntrinsicCandidate,
 940     _jdk_internal_vm_annotation_Contended,
 941     _field_Stable,
 942     _jdk_internal_vm_annotation_ReservedStackAccess,
 943     _jdk_internal_ValueBased,
 944     _jdk_internal_LooselyConsistentValue,
 945     _jdk_internal_NullRestricted,
 946     _java_lang_Deprecated,
 947     _java_lang_Deprecated_for_removal,
 948     _jdk_internal_vm_annotation_AOTSafeClassInitializer,
 949     _method_AOTRuntimeSetup,
 950     _annotation_LIMIT
 951   };
 952   const Location _location;
 953   int _annotations_present;
 954   u2 _contended_group;
 955 
 956   AnnotationCollector(Location location)
 957     : _location(location), _annotations_present(0), _contended_group(0)
 958   {
 959     assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, "");
 960   }
 961   // If this annotation name has an ID, report it (or _none).
 962   ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations);
 963   // Set the annotation name:
 964   void set_annotation(ID id) {
 965     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 966     _annotations_present |= (int)nth_bit((int)id);
 967   }
 968 
 969   void remove_annotation(ID id) {
 970     assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob");
 971     _annotations_present &= (int)~nth_bit((int)id);
 972   }
 973 
 974   // Report if the annotation is present.
 975   bool has_any_annotations() const { return _annotations_present != 0; }
 976   bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; }
 977 
 978   void set_contended_group(u2 group) { _contended_group = group; }
 979   u2 contended_group() const { return _contended_group; }
 980 
 981   bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); }
 982 
 983   void set_stable(bool stable) { set_annotation(_field_Stable); }
 984   bool is_stable() const { return has_annotation(_field_Stable); }
 985 
 986   bool has_aot_runtime_setup() const { return has_annotation(_method_AOTRuntimeSetup); }
 987 };
 988 
 989 // This class also doubles as a holder for metadata cleanup.
 990 class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector {
 991 private:
 992   ClassLoaderData* _loader_data;
 993   AnnotationArray* _field_annotations;
 994   AnnotationArray* _field_type_annotations;
 995 public:
 996   FieldAnnotationCollector(ClassLoaderData* loader_data) :
 997     AnnotationCollector(_in_field),
 998     _loader_data(loader_data),
 999     _field_annotations(nullptr),
1000     _field_type_annotations(nullptr) {}
1001   ~FieldAnnotationCollector();
1002   void apply_to(FieldInfo* f);
1003   AnnotationArray* field_annotations()      { return _field_annotations; }
1004   AnnotationArray* field_type_annotations() { return _field_type_annotations; }
1005 
1006   void set_field_annotations(AnnotationArray* a)      { _field_annotations = a; }
1007   void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; }
1008 };
1009 
1010 class MethodAnnotationCollector : public AnnotationCollector{
1011 public:
1012   MethodAnnotationCollector() : AnnotationCollector(_in_method) { }
1013   void apply_to(const methodHandle& m);
1014 };
1015 
1016 class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{
1017 public:
1018   ClassAnnotationCollector() : AnnotationCollector(_in_class) { }
1019   void apply_to(InstanceKlass* ik);
1020 };
1021 
1022 
1023 static int skip_annotation_value(const u1*, int, int); // fwd decl
1024 
1025 // Safely increment index by val if does not pass limit
1026 #define SAFE_ADD(index, limit, val) \
1027 if (index >= limit - val) return limit; \
1028 index += val;
1029 
1030 // Skip an annotation.  Return >=limit if there is any problem.
1031 static int skip_annotation(const u1* buffer, int limit, int index) {
1032   assert(buffer != nullptr, "invariant");
1033   // annotation := atype:u2 do(nmem:u2) {member:u2 value}
1034   // value := switch (tag:u1) { ... }
1035   SAFE_ADD(index, limit, 4); // skip atype and read nmem
1036   int nmem = Bytes::get_Java_u2((address)buffer + index - 2);
1037   while (--nmem >= 0 && index < limit) {
1038     SAFE_ADD(index, limit, 2); // skip member
1039     index = skip_annotation_value(buffer, limit, index);
1040   }
1041   return index;
1042 }
1043 
1044 // Skip an annotation value.  Return >=limit if there is any problem.
1045 static int skip_annotation_value(const u1* buffer, int limit, int index) {
1046   assert(buffer != nullptr, "invariant");
1047 
1048   // value := switch (tag:u1) {
1049   //   case B, C, I, S, Z, D, F, J, c: con:u2;
1050   //   case e: e_class:u2 e_name:u2;
1051   //   case s: s_con:u2;
1052   //   case [: do(nval:u2) {value};
1053   //   case @: annotation;
1054   //   case s: s_con:u2;
1055   // }
1056   SAFE_ADD(index, limit, 1); // read tag
1057   const u1 tag = buffer[index - 1];
1058   switch (tag) {
1059     case 'B':
1060     case 'C':
1061     case 'I':
1062     case 'S':
1063     case 'Z':
1064     case 'D':
1065     case 'F':
1066     case 'J':
1067     case 'c':
1068     case 's':
1069       SAFE_ADD(index, limit, 2);  // skip con or s_con
1070       break;
1071     case 'e':
1072       SAFE_ADD(index, limit, 4);  // skip e_class, e_name
1073       break;
1074     case '[':
1075     {
1076       SAFE_ADD(index, limit, 2); // read nval
1077       int nval = Bytes::get_Java_u2((address)buffer + index - 2);
1078       while (--nval >= 0 && index < limit) {
1079         index = skip_annotation_value(buffer, limit, index);
1080       }
1081     }
1082     break;
1083     case '@':
1084       index = skip_annotation(buffer, limit, index);
1085       break;
1086     default:
1087       return limit;  //  bad tag byte
1088   }
1089   return index;
1090 }
1091 
1092 // Sift through annotations, looking for those significant to the VM:
1093 static void parse_annotations(const ConstantPool* const cp,
1094                               const u1* buffer, int limit,
1095                               AnnotationCollector* coll,
1096                               ClassLoaderData* loader_data,
1097                               const bool can_access_vm_annotations) {
1098 
1099   assert(cp != nullptr, "invariant");
1100   assert(buffer != nullptr, "invariant");
1101   assert(coll != nullptr, "invariant");
1102   assert(loader_data != nullptr, "invariant");
1103 
1104   // annotations := do(nann:u2) {annotation}
1105   int index = 2; // read nann
1106   if (index >= limit)  return;
1107   int nann = Bytes::get_Java_u2((address)buffer + index - 2);
1108   enum {  // initial annotation layout
1109     atype_off = 0,      // utf8 such as 'Ljava/lang/annotation/Retention;'
1110     count_off = 2,      // u2   such as 1 (one value)
1111     member_off = 4,     // utf8 such as 'value'
1112     tag_off = 6,        // u1   such as 'c' (type) or 'e' (enum)
1113     e_tag_val = 'e',
1114     e_type_off = 7,   // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;'
1115     e_con_off = 9,    // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME'
1116     e_size = 11,     // end of 'e' annotation
1117     c_tag_val = 'c',    // payload is type
1118     c_con_off = 7,    // utf8 payload, such as 'I'
1119     c_size = 9,       // end of 'c' annotation
1120     s_tag_val = 's',    // payload is String
1121     s_con_off = 7,    // utf8 payload, such as 'Ljava/lang/String;'
1122     s_size = 9,
1123     b_tag_val = 'Z',  // payload is boolean
1124     min_size = 6        // smallest possible size (zero members)
1125   };
1126   // Cannot add min_size to index in case of overflow MAX_INT
1127   while ((--nann) >= 0 && (index - 2 <= limit - min_size)) {
1128     int index0 = index;
1129     index = skip_annotation(buffer, limit, index);
1130     const u1* const abase = buffer + index0;
1131     const int atype = Bytes::get_Java_u2((address)abase + atype_off);
1132     const int count = Bytes::get_Java_u2((address)abase + count_off);
1133     const Symbol* const aname = check_symbol_at(cp, atype);
1134     if (aname == nullptr)  break;  // invalid annotation name
1135     const Symbol* member = nullptr;
1136     if (count >= 1) {
1137       const int member_index = Bytes::get_Java_u2((address)abase + member_off);
1138       member = check_symbol_at(cp, member_index);
1139       if (member == nullptr)  break;  // invalid member name
1140     }
1141 
1142     // Here is where parsing particular annotations will take place.
1143     AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations);
1144     if (AnnotationCollector::_unknown == id)  continue;
1145     coll->set_annotation(id);
1146     if (AnnotationCollector::_java_lang_Deprecated == id) {
1147       // @Deprecated can specify forRemoval=true, which we need
1148       // to record for JFR to use. If the annotation is not well-formed
1149       // then we may not be able to determine that.
1150       const u1* offset = abase + member_off;
1151       // There are only 2 members in @Deprecated.
1152       int n_members = MIN2(count, 2);
1153       for (int i = 0; i < n_members; ++i) {
1154         int member_index = Bytes::get_Java_u2((address)offset);
1155         offset += 2;
1156         member = check_symbol_at(cp, member_index);
1157         if (member == vmSymbols::since() &&
1158             (*((address)offset) == s_tag_val)) {
1159           // Found `since` first so skip over it
1160           offset += 3;
1161         }
1162         else if (member == vmSymbols::for_removal() &&
1163                  (*((address)offset) == b_tag_val)) {
1164           const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1);
1165           // No guarantee the entry is valid so check it refers to an int in the CP.
1166           if (cp->is_within_bounds(boolean_value_index) &&
1167               cp->tag_at(boolean_value_index).is_int() &&
1168               cp->int_at(boolean_value_index) == 1) {
1169             // forRemoval == true
1170             coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal);
1171           }
1172           break; // no need to check further
1173         }
1174         else {
1175           // This @Deprecated annotation is malformed so we don't try to
1176           // determine whether forRemoval is set.
1177           break;
1178         }
1179       }
1180       continue; // proceed to next annotation
1181     }
1182 
1183     if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) {
1184       // @Contended can optionally specify the contention group.
1185       //
1186       // Contended group defines the equivalence class over the fields:
1187       // the fields within the same contended group are not treated distinct.
1188       // The only exception is default group, which does not incur the
1189       // equivalence. Naturally, contention group for classes is meaningless.
1190       //
1191       // While the contention group is specified as String, annotation
1192       // values are already interned, and we might as well use the constant
1193       // pool index as the group tag.
1194       //
1195       u2 group_index = 0; // default contended group
1196       if (count == 1
1197         && s_size == (index - index0)  // match size
1198         && s_tag_val == *(abase + tag_off)
1199         && member == vmSymbols::value_name()) {
1200         group_index = Bytes::get_Java_u2((address)abase + s_con_off);
1201         // No guarantee the group_index is valid so check it refers to a
1202         // symbol in the CP.
1203         if (cp->is_within_bounds(group_index) &&
1204             cp->tag_at(group_index).is_utf8()) {
1205           // Seems valid, so check for empty string and reset
1206           if (cp->symbol_at(group_index)->utf8_length() == 0) {
1207             group_index = 0; // default contended group
1208           }
1209         } else {
1210           // Not valid so use the default
1211           group_index = 0;
1212         }
1213       }
1214       coll->set_contended_group(group_index);
1215       continue; // proceed to next annotation
1216     }
1217   }
1218 }
1219 
1220 
1221 // Parse attributes for a field.
1222 void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs,
1223                                              u2 attributes_count,
1224                                              bool is_static, u2 signature_index,
1225                                              u2* const constantvalue_index_addr,
1226                                              bool* const is_synthetic_addr,
1227                                              u2* const generic_signature_index_addr,
1228                                              ClassFileParser::FieldAnnotationCollector* parsed_annotations,
1229                                              TRAPS) {
1230   assert(cfs != nullptr, "invariant");
1231   assert(constantvalue_index_addr != nullptr, "invariant");
1232   assert(is_synthetic_addr != nullptr, "invariant");
1233   assert(generic_signature_index_addr != nullptr, "invariant");
1234   assert(parsed_annotations != nullptr, "invariant");
1235   assert(attributes_count > 0, "attributes_count should be greater than 0");
1236 
1237   u2 constantvalue_index = 0;
1238   u2 generic_signature_index = 0;
1239   bool is_synthetic = false;
1240   const u1* runtime_visible_annotations = nullptr;
1241   int runtime_visible_annotations_length = 0;
1242   const u1* runtime_visible_type_annotations = nullptr;
1243   int runtime_visible_type_annotations_length = 0;
1244   bool runtime_invisible_annotations_exists = false;
1245   bool runtime_invisible_type_annotations_exists = false;
1246   const ConstantPool* const cp = _cp;
1247 
1248   while (attributes_count--) {
1249     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
1250     const u2 attribute_name_index = cfs->get_u2_fast();
1251     const u4 attribute_length = cfs->get_u4_fast();
1252     guarantee_property(valid_symbol_at(attribute_name_index),
1253                        "Invalid field attribute index %u in class file %s",
1254                        attribute_name_index,
1255                        CHECK);
1256 
1257     const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
1258     if (is_static && attribute_name == vmSymbols::tag_constant_value()) {
1259       // ignore if non-static
1260       if (constantvalue_index != 0) {
1261         classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD);
1262         return;
1263       }
1264       guarantee_property(
1265         attribute_length == 2,
1266         "Invalid ConstantValue field attribute length %u in class file %s",
1267         attribute_length, CHECK);
1268 
1269       constantvalue_index = cfs->get_u2(CHECK);
1270       if (_need_verify) {
1271         verify_constantvalue(cp, constantvalue_index, signature_index, CHECK);
1272       }
1273     } else if (attribute_name == vmSymbols::tag_synthetic()) {
1274       if (attribute_length != 0) {
1275         classfile_parse_error(
1276           "Invalid Synthetic field attribute length %u in class file %s",
1277           attribute_length, THREAD);
1278         return;
1279       }
1280       is_synthetic = true;
1281     } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120
1282       if (attribute_length != 0) {
1283         classfile_parse_error(
1284           "Invalid Deprecated field attribute length %u in class file %s",
1285           attribute_length, THREAD);
1286         return;
1287       }
1288     } else if (_major_version >= JAVA_1_5_VERSION) {
1289       if (attribute_name == vmSymbols::tag_signature()) {
1290         if (generic_signature_index != 0) {
1291           classfile_parse_error(
1292             "Multiple Signature attributes for field in class file %s", THREAD);
1293           return;
1294         }
1295         if (attribute_length != 2) {
1296           classfile_parse_error(
1297             "Wrong size %u for field's Signature attribute in class file %s",
1298             attribute_length, THREAD);
1299           return;
1300         }
1301         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK);
1302       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
1303         if (runtime_visible_annotations != nullptr) {
1304           classfile_parse_error(
1305             "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD);
1306           return;
1307         }
1308         runtime_visible_annotations_length = attribute_length;
1309         runtime_visible_annotations = cfs->current();
1310         assert(runtime_visible_annotations != nullptr, "null visible annotations");
1311         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
1312         parse_annotations(cp,
1313                           runtime_visible_annotations,
1314                           runtime_visible_annotations_length,
1315                           parsed_annotations,
1316                           _loader_data,
1317                           _can_access_vm_annotations);
1318         cfs->skip_u1_fast(runtime_visible_annotations_length);
1319       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
1320         if (runtime_invisible_annotations_exists) {
1321           classfile_parse_error(
1322             "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD);
1323           return;
1324         }
1325         runtime_invisible_annotations_exists = true;
1326         cfs->skip_u1(attribute_length, CHECK);
1327       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
1328         if (runtime_visible_type_annotations != nullptr) {
1329           classfile_parse_error(
1330             "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD);
1331           return;
1332         }
1333         runtime_visible_type_annotations_length = attribute_length;
1334         runtime_visible_type_annotations = cfs->current();
1335         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
1336         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
1337       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
1338         if (runtime_invisible_type_annotations_exists) {
1339           classfile_parse_error(
1340             "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD);
1341           return;
1342         } else {
1343           runtime_invisible_type_annotations_exists = true;
1344         }
1345         cfs->skip_u1(attribute_length, CHECK);
1346       } else {
1347         cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1348       }
1349     } else {
1350       cfs->skip_u1(attribute_length, CHECK);  // Skip unknown attributes
1351     }
1352   }
1353 
1354   *constantvalue_index_addr = constantvalue_index;
1355   *is_synthetic_addr = is_synthetic;
1356   *generic_signature_index_addr = generic_signature_index;
1357   AnnotationArray* a = allocate_annotations(runtime_visible_annotations,
1358                                             runtime_visible_annotations_length,
1359                                             CHECK);
1360   parsed_annotations->set_field_annotations(a);
1361   a = allocate_annotations(runtime_visible_type_annotations,
1362                            runtime_visible_type_annotations_length,
1363                            CHECK);
1364   parsed_annotations->set_field_type_annotations(a);
1365   return;
1366 }
1367 
1368 
1369 // Side-effects: populates the _fields, _fields_annotations,
1370 // _fields_type_annotations fields
1371 void ClassFileParser::parse_fields(const ClassFileStream* const cfs,
1372                                    AccessFlags class_access_flags,
1373                                    ConstantPool* cp,
1374                                    const int cp_size,
1375                                    u2* const java_fields_count_ptr,
1376                                    TRAPS) {
1377 
1378   assert(cfs != nullptr, "invariant");
1379   assert(cp != nullptr, "invariant");
1380   assert(java_fields_count_ptr != nullptr, "invariant");
1381 
1382   assert(nullptr == _fields_annotations, "invariant");
1383   assert(nullptr == _fields_type_annotations, "invariant");
1384 
1385   bool is_inline_type = !class_access_flags.is_identity_class() && !class_access_flags.is_abstract();
1386   bool is_value_class = !class_access_flags.is_identity_class() && !class_access_flags.is_interface();
1387   cfs->guarantee_more(2, CHECK);  // length
1388   const u2 length = cfs->get_u2_fast();
1389   *java_fields_count_ptr = length;
1390 
1391   int num_injected = 0;
1392   const InjectedField* const injected = JavaClasses::get_injected(_class_name,
1393                                                                   &num_injected);
1394 
1395   // two more slots are required for inline classes:
1396   // one for the static field with a reference to the pre-allocated default value
1397   // one for the field the JVM injects when detecting an empty inline class
1398   const int total_fields = length + num_injected + (is_inline_type ? 2 : 0)
1399                            + ((UseAltSubstitutabilityMethod && is_value_class) ? 1 : 0);
1400 
1401   // Allocate a temporary resource array to collect field data.
1402   // After parsing all fields, data are stored in a UNSIGNED5 compressed stream.
1403   _temp_field_info = new GrowableArray<FieldInfo>(total_fields);
1404 
1405   int instance_fields_count = 0;
1406   ResourceMark rm(THREAD);
1407   for (int n = 0; n < length; n++) {
1408     // access_flags, name_index, descriptor_index, attributes_count
1409     cfs->guarantee_more(8, CHECK);
1410 
1411     jint recognized_modifiers = JVM_RECOGNIZED_FIELD_MODIFIERS;
1412     if (!supports_inline_types()) {
1413       recognized_modifiers &= ~JVM_ACC_STRICT;
1414     }
1415 
1416     const jint flags = cfs->get_u2_fast() & recognized_modifiers;
1417     verify_legal_field_modifiers(flags, class_access_flags, CHECK);
1418     AccessFlags access_flags;


1419     access_flags.set_flags(flags);
1420     FieldInfo::FieldFlags fieldFlags(0);
1421 
1422     const u2 name_index = cfs->get_u2_fast();
1423     guarantee_property(valid_symbol_at(name_index),
1424       "Invalid constant pool index %u for field name in class file %s",
1425       name_index, CHECK);
1426     const Symbol* const name = cp->symbol_at(name_index);
1427     verify_legal_field_name(name, CHECK);
1428 
1429     const u2 signature_index = cfs->get_u2_fast();
1430     guarantee_property(valid_symbol_at(signature_index),
1431       "Invalid constant pool index %u for field signature in class file %s",
1432       signature_index, CHECK);
1433     const Symbol* const sig = cp->symbol_at(signature_index);
1434     verify_legal_field_signature(name, sig, CHECK);
1435     if (!access_flags.is_static()) instance_fields_count++;
1436 
1437     u2 constantvalue_index = 0;
1438     bool is_synthetic = false;
1439     u2 generic_signature_index = 0;
1440     const bool is_static = access_flags.is_static();
1441     FieldAnnotationCollector parsed_annotations(_loader_data);
1442 
1443     bool is_null_restricted = false;
1444 
1445     const u2 attributes_count = cfs->get_u2_fast();
1446     if (attributes_count > 0) {
1447       parse_field_attributes(cfs,
1448                              attributes_count,
1449                              is_static,
1450                              signature_index,
1451                              &constantvalue_index,
1452                              &is_synthetic,
1453                              &generic_signature_index,
1454                              &parsed_annotations,
1455                              CHECK);
1456 
1457       if (parsed_annotations.field_annotations() != nullptr) {
1458         if (_fields_annotations == nullptr) {
1459           _fields_annotations = MetadataFactory::new_array<AnnotationArray*>(
1460                                              _loader_data, length, nullptr,
1461                                              CHECK);
1462         }
1463         _fields_annotations->at_put(n, parsed_annotations.field_annotations());
1464         if (parsed_annotations.has_annotation(AnnotationCollector::_jdk_internal_NullRestricted)) {
1465           if (!Signature::has_envelope(sig)) {
1466             Exceptions::fthrow(
1467               THREAD_AND_LOCATION,
1468               vmSymbols::java_lang_ClassFormatError(),
1469               "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s with signature %s (primitive types can never be null)",
1470               class_name()->as_C_string(), name->as_C_string(), sig->as_C_string());
1471           }
1472           const bool is_strict = (flags & JVM_ACC_STRICT) != 0;
1473           if (!is_strict) {
1474             Exceptions::fthrow(
1475               THREAD_AND_LOCATION,
1476               vmSymbols::java_lang_ClassFormatError(),
1477               "Illegal use of @jdk.internal.vm.annotation.NullRestricted annotation on field %s.%s which doesn't have the @jdk.internal.vm.annotation.Strict annotation",
1478               class_name()->as_C_string(), name->as_C_string());
1479           }
1480           is_null_restricted = true;
1481         }
1482         parsed_annotations.set_field_annotations(nullptr);
1483       }
1484       if (parsed_annotations.field_type_annotations() != nullptr) {
1485         if (_fields_type_annotations == nullptr) {
1486           _fields_type_annotations =
1487             MetadataFactory::new_array<AnnotationArray*>(_loader_data,
1488                                                          length,
1489                                                          nullptr,
1490                                                          CHECK);
1491         }
1492         _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations());
1493         parsed_annotations.set_field_type_annotations(nullptr);
1494       }
1495 
1496       if (is_synthetic) {
1497         access_flags.set_is_synthetic();
1498       }
1499       if (generic_signature_index != 0) {
1500         fieldFlags.update_generic(true);
1501       }
1502     }
1503 
1504     if (is_null_restricted) {
1505       fieldFlags.update_null_free_inline_type(true);
1506     }
1507 
1508     const BasicType type = cp->basic_type_for_signature_at(signature_index);
1509 
1510     // Update number of static oop fields.
1511     if (is_static && is_reference_type(type)) {
1512       _static_oop_count++;
1513     }
1514 
1515     FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags);
1516     fi.set_index(n);
1517     if (fieldFlags.is_generic()) {
1518       fi.set_generic_signature_index(generic_signature_index);
1519     }
1520     parsed_annotations.apply_to(&fi);
1521     if (fi.field_flags().is_contended()) {
1522       _has_contended_fields = true;
1523     }
1524     if (access_flags.is_strict() && access_flags.is_static()) {
1525       _has_strict_static_fields = true;
1526     }
1527     _temp_field_info->append(fi);
1528   }
1529   assert(_temp_field_info->length() == length, "Must be");
1530 

1531   if (num_injected != 0) {
1532     for (int n = 0; n < num_injected; n++) {
1533       // Check for duplicates
1534       if (injected[n].may_be_java) {
1535         const Symbol* const name      = injected[n].name();
1536         const Symbol* const signature = injected[n].signature();
1537         bool duplicate = false;
1538         for (int i = 0; i < length; i++) {
1539           const FieldInfo* const f = _temp_field_info->adr_at(i);
1540           if (name      == cp->symbol_at(f->name_index()) &&
1541               signature == cp->symbol_at(f->signature_index())) {
1542             // Symbol is desclared in Java so skip this one
1543             duplicate = true;
1544             break;
1545           }
1546         }
1547         if (duplicate) {
1548           // These will be removed from the field array at the end
1549           continue;
1550         }
1551       }
1552 
1553       // Injected field
1554       FieldInfo::FieldFlags fflags(0);
1555       fflags.update_injected(true);
1556       AccessFlags aflags;
1557       FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags);
1558       int idx = _temp_field_info->append(fi);
1559       _temp_field_info->adr_at(idx)->set_index(idx);

1560     }
1561   }
1562 
1563   if (is_inline_type) {
1564     // Inject static ".null_reset" field. This is an all-zero value with its null-channel set to zero.
1565     // IT should never be seen by user code, it is used when writing "null" to a nullable flat field
1566     // The all-zero value ensure that any embedded oop will be set to null, to avoid keeping dead objects
1567     // alive.
1568     FieldInfo::FieldFlags fflags2(0);
1569     fflags2.update_injected(true);
1570     AccessFlags aflags2(JVM_ACC_STATIC);
1571     FieldInfo fi2(aflags2,
1572                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(null_reset_value_name)),
1573                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(object_signature)),
1574                  0,
1575                  fflags2);
1576     int idx2 = _temp_field_info->append(fi2);
1577     _temp_field_info->adr_at(idx2)->set_index(idx2);
1578     _static_oop_count++;
1579   }
1580   if (!access_flags().is_identity_class() && !access_flags().is_interface()
1581       && _class_name != vmSymbols::java_lang_Object() && UseAltSubstitutabilityMethod) {
1582     // Acmp map required for abstract and concrete value classes
1583     FieldInfo::FieldFlags fflags2(0);
1584     fflags2.update_injected(true);
1585     fflags2.update_stable(true);
1586     AccessFlags aflags2(JVM_ACC_STATIC | JVM_ACC_FINAL);
1587     FieldInfo fi3(aflags2,
1588                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(acmp_maps_name)),
1589                  (u2)vmSymbols::as_int(VM_SYMBOL_ENUM_NAME(int_array_signature)),
1590                  0,
1591                  fflags2);
1592     int idx2 = _temp_field_info->append(fi3);
1593     _temp_field_info->adr_at(idx2)->set_index(idx2);
1594     _static_oop_count++;
1595   }
1596 
1597   if (_need_verify && length > 1) {
1598     // Check duplicated fields
1599     ResourceMark rm(THREAD);
1600     // Set containing name-signature pairs
1601     NameSigHashtable* names_and_sigs = new NameSigHashtable();
1602     for (int i = 0; i < _temp_field_info->length(); i++) {
1603       NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp),
1604                                _temp_field_info->adr_at(i)->signature(_cp));
1605       // If no duplicates, add name/signature in hashtable names_and_sigs.
1606       if(!names_and_sigs->put(name_and_sig, 0)) {
1607         classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s",
1608                                name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
1609         return;
1610       }
1611     }
1612   }
1613 }
1614 
1615 
1616 const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs,
1617                                                                          u4 code_length,
1618                                                                          u4 exception_table_length,
1619                                                                          TRAPS) {
1620   assert(cfs != nullptr, "invariant");
1621 
1622   const unsafe_u2* const exception_table_start = cfs->current();
1623   assert(exception_table_start != nullptr, "null exception table");
1624 
1625   cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc,
1626                                                                // end_pc,
1627                                                                // handler_pc,
1628                                                                // catch_type_index
1629 
1630   // Will check legal target after parsing code array in verifier.
1631   if (_need_verify) {
1632     for (unsigned int i = 0; i < exception_table_length; i++) {
1633       const u2 start_pc = cfs->get_u2_fast();
1634       const u2 end_pc = cfs->get_u2_fast();
1635       const u2 handler_pc = cfs->get_u2_fast();
1636       const u2 catch_type_index = cfs->get_u2_fast();
1637       guarantee_property((start_pc < end_pc) && (end_pc <= code_length),
1638                          "Illegal exception table range in class file %s",
1639                          CHECK_NULL);
1640       guarantee_property(handler_pc < code_length,
1641                          "Illegal exception table handler in class file %s",
1642                          CHECK_NULL);
1643       if (catch_type_index != 0) {
1644         guarantee_property(valid_klass_reference_at(catch_type_index),
1645                            "Catch type in exception table has bad constant type in class file %s", CHECK_NULL);
1646       }
1647     }
1648   } else {
1649     cfs->skip_u2_fast(exception_table_length * 4);
1650   }
1651   return exception_table_start;
1652 }
1653 
1654 void ClassFileParser::parse_linenumber_table(u4 code_attribute_length,
1655                                              u4 code_length,
1656                                              CompressedLineNumberWriteStream**const write_stream,
1657                                              TRAPS) {
1658 
1659   const ClassFileStream* const cfs = _stream;
1660   unsigned int num_entries = cfs->get_u2(CHECK);
1661 
1662   // Each entry is a u2 start_pc, and a u2 line_number
1663   const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2);
1664 
1665   // Verify line number attribute and table length
1666   guarantee_property(
1667     code_attribute_length == sizeof(u2) + length_in_bytes,
1668     "LineNumberTable attribute has wrong length in class file %s", CHECK);
1669 
1670   cfs->guarantee_more(length_in_bytes, CHECK);
1671 
1672   if ((*write_stream) == nullptr) {
1673     if (length_in_bytes > fixed_buffer_size) {
1674       (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes);
1675     } else {
1676       (*write_stream) = new CompressedLineNumberWriteStream(
1677         _linenumbertable_buffer, fixed_buffer_size);
1678     }
1679   }
1680 
1681   while (num_entries-- > 0) {
1682     const u2 bci  = cfs->get_u2_fast(); // start_pc
1683     const u2 line = cfs->get_u2_fast(); // line_number
1684     guarantee_property(bci < code_length,
1685         "Invalid pc in LineNumberTable in class file %s", CHECK);
1686     (*write_stream)->write_pair(bci, line);
1687   }
1688 }
1689 
1690 
1691 class LVT_Hash : public AllStatic {
1692  public:
1693 
1694   static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) {
1695   /*
1696    * 3-tuple start_bci/length/slot has to be unique key,
1697    * so the following comparison seems to be redundant:
1698    *       && elem->name_cp_index == entry->_elem->name_cp_index
1699    */
1700     return (e0.start_bci     == e1.start_bci &&
1701             e0.length        == e1.length &&
1702             e0.name_cp_index == e1.name_cp_index &&
1703             e0.slot          == e1.slot);
1704   }
1705 
1706   static unsigned int hash(LocalVariableTableElement const& e0) {
1707     unsigned int raw_hash = e0.start_bci;
1708 
1709     raw_hash = e0.length        + raw_hash * 37;
1710     raw_hash = e0.name_cp_index + raw_hash * 37;
1711     raw_hash = e0.slot          + raw_hash * 37;
1712 
1713     return raw_hash;
1714   }
1715 };
1716 
1717 
1718 // Class file LocalVariableTable elements.
1719 class Classfile_LVT_Element {
1720  public:
1721   u2 start_bci;
1722   u2 length;
1723   u2 name_cp_index;
1724   u2 descriptor_cp_index;
1725   u2 slot;
1726 };
1727 
1728 static void copy_lvt_element(const Classfile_LVT_Element* const src,
1729                              LocalVariableTableElement* const lvt) {
1730   lvt->start_bci           = Bytes::get_Java_u2((u1*) &src->start_bci);
1731   lvt->length              = Bytes::get_Java_u2((u1*) &src->length);
1732   lvt->name_cp_index       = Bytes::get_Java_u2((u1*) &src->name_cp_index);
1733   lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index);
1734   lvt->signature_cp_index  = 0;
1735   lvt->slot                = Bytes::get_Java_u2((u1*) &src->slot);
1736 }
1737 
1738 // Function is used to parse both attributes:
1739 // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT)
1740 const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs,
1741                                                                              u4 code_length,
1742                                                                              u2 max_locals,
1743                                                                              u4 code_attribute_length,
1744                                                                              u2* const localvariable_table_length,
1745                                                                              bool isLVTT,
1746                                                                              TRAPS) {
1747   const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable";
1748   *localvariable_table_length = cfs->get_u2(CHECK_NULL);
1749   const unsigned int size = checked_cast<unsigned>(
1750     (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2));
1751 
1752   const ConstantPool* const cp = _cp;
1753 
1754   // Verify local variable table attribute has right length
1755   if (_need_verify) {
1756     guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)),
1757                        "%s has wrong length in class file %s", tbl_name, CHECK_NULL);
1758   }
1759 
1760   const unsafe_u2* const localvariable_table_start = cfs->current();
1761   assert(localvariable_table_start != nullptr, "null local variable table");
1762   if (!_need_verify) {
1763     cfs->skip_u2_fast(size);
1764   } else {
1765     cfs->guarantee_more(size * 2, CHECK_NULL);
1766     for(int i = 0; i < (*localvariable_table_length); i++) {
1767       const u2 start_pc = cfs->get_u2_fast();
1768       const u2 length = cfs->get_u2_fast();
1769       const u2 name_index = cfs->get_u2_fast();
1770       const u2 descriptor_index = cfs->get_u2_fast();
1771       const u2 index = cfs->get_u2_fast();
1772       // Assign to a u4 to avoid overflow
1773       const u4 end_pc = (u4)start_pc + (u4)length;
1774 
1775       if (start_pc >= code_length) {
1776         classfile_parse_error(
1777           "Invalid start_pc %u in %s in class file %s",
1778           start_pc, tbl_name, THREAD);
1779         return nullptr;
1780       }
1781       if (end_pc > code_length) {
1782         classfile_parse_error(
1783           "Invalid length %u in %s in class file %s",
1784           length, tbl_name, THREAD);
1785         return nullptr;
1786       }
1787       const int cp_size = cp->length();
1788       guarantee_property(valid_symbol_at(name_index),
1789         "Name index %u in %s has bad constant type in class file %s",
1790         name_index, tbl_name, CHECK_NULL);
1791       guarantee_property(valid_symbol_at(descriptor_index),
1792         "Signature index %u in %s has bad constant type in class file %s",
1793         descriptor_index, tbl_name, CHECK_NULL);
1794 
1795       const Symbol* const name = cp->symbol_at(name_index);
1796       const Symbol* const sig = cp->symbol_at(descriptor_index);
1797       verify_legal_field_name(name, CHECK_NULL);
1798       u2 extra_slot = 0;
1799       if (!isLVTT) {
1800         verify_legal_field_signature(name, sig, CHECK_NULL);
1801 
1802         // 4894874: check special cases for double and long local variables
1803         if (sig == vmSymbols::type_signature(T_DOUBLE) ||
1804             sig == vmSymbols::type_signature(T_LONG)) {
1805           extra_slot = 1;
1806         }
1807       }
1808       guarantee_property((index + extra_slot) < max_locals,
1809                           "Invalid index %u in %s in class file %s",
1810                           index, tbl_name, CHECK_NULL);
1811     }
1812   }
1813   return localvariable_table_start;
1814 }
1815 
1816 static const u1* parse_stackmap_table(const ClassFileStream* const cfs,
1817                                       u4 code_attribute_length,
1818                                       TRAPS) {
1819   assert(cfs != nullptr, "invariant");
1820 
1821   if (0 == code_attribute_length) {
1822     return nullptr;
1823   }
1824 
1825   const u1* const stackmap_table_start = cfs->current();
1826   assert(stackmap_table_start != nullptr, "null stackmap table");
1827 
1828   // check code_attribute_length
1829   cfs->skip_u1(code_attribute_length, CHECK_NULL);
1830 
1831   return stackmap_table_start;
1832 }
1833 
1834 const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs,
1835                                                                             u2* const checked_exceptions_length,
1836                                                                             u4 method_attribute_length,
1837                                                                             TRAPS) {
1838   assert(cfs != nullptr, "invariant");
1839   assert(checked_exceptions_length != nullptr, "invariant");
1840 
1841   cfs->guarantee_more(2, CHECK_NULL);  // checked_exceptions_length
1842   *checked_exceptions_length = cfs->get_u2_fast();
1843   const unsigned int size =
1844     (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2);
1845   const unsafe_u2* const checked_exceptions_start = cfs->current();
1846   assert(checked_exceptions_start != nullptr, "null checked exceptions");
1847   if (!_need_verify) {
1848     cfs->skip_u2_fast(size);
1849   } else {
1850     // Verify each value in the checked exception table
1851     u2 checked_exception;
1852     const u2 len = *checked_exceptions_length;
1853     cfs->guarantee_more(2 * len, CHECK_NULL);
1854     for (int i = 0; i < len; i++) {
1855       checked_exception = cfs->get_u2_fast();
1856       guarantee_property(
1857         valid_klass_reference_at(checked_exception),
1858         "Exception name has bad type at constant pool %u in class file %s",
1859         checked_exception, CHECK_NULL);
1860     }
1861   }
1862   // check exceptions attribute length
1863   if (_need_verify) {
1864     guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) +
1865                                                    sizeof(u2) * size),
1866                       "Exceptions attribute has wrong length in class file %s", CHECK_NULL);
1867   }
1868   return checked_exceptions_start;
1869 }
1870 
1871 void ClassFileParser::throwIllegalSignature(const char* type,
1872                                             const Symbol* name,
1873                                             const Symbol* sig,
1874                                             TRAPS) const {
1875   assert(name != nullptr, "invariant");
1876   assert(sig != nullptr, "invariant");
1877 
1878   ResourceMark rm(THREAD);
1879   // Names are all known to be < 64k so we know this formatted message is not excessively large.
1880   Exceptions::fthrow(THREAD_AND_LOCATION,
1881       vmSymbols::java_lang_ClassFormatError(),
1882       "%s \"%s\" in class %s has illegal signature \"%s\"", type,
1883       name->as_C_string(), _class_name->as_C_string(), sig->as_C_string());
1884 }
1885 
1886 AnnotationCollector::ID
1887 AnnotationCollector::annotation_index(const ClassLoaderData* loader_data,
1888                                       const Symbol* name,
1889                                       const bool can_access_vm_annotations) {
1890   const vmSymbolID sid = vmSymbols::find_sid(name);
1891   // Privileged code can use all annotations.  Other code silently drops some.
1892   const bool privileged = loader_data->is_boot_class_loader_data() ||
1893                           loader_data->is_platform_class_loader_data() ||
1894                           can_access_vm_annotations;
1895   switch (sid) {
1896     case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): {
1897       if (_location != _in_method)  break;  // only allow for methods
1898       if (!privileged)              break;  // only allow in privileged code
1899       return _method_CallerSensitive;
1900     }
1901     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): {
1902       if (_location != _in_method)  break;  // only allow for methods
1903       if (!privileged)              break;  // only allow in privileged code
1904       return _method_ForceInline;
1905     }
1906     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): {
1907       if (_location != _in_method)  break;  // only allow for methods
1908       if (!privileged)              break;  // only allow in privileged code
1909       return _method_DontInline;
1910     }
1911     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): {
1912       if (_location != _in_method)  break;  // only allow for methods
1913       if (!privileged)              break;  // only allow in privileged code
1914       return _method_ChangesCurrentThread;
1915     }
1916     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): {
1917       if (_location != _in_method)  break;  // only allow for methods
1918       if (!privileged)              break;  // only allow in privileged code
1919       return _method_JvmtiHideEvents;
1920     }
1921     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): {
1922       if (_location != _in_method)  break;  // only allow for methods
1923       if (!privileged)              break;  // only allow in privileged code
1924       return _method_JvmtiMountTransition;
1925     }
1926     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): {
1927       if (_location != _in_method)  break;  // only allow for methods
1928       if (!privileged)              break;  // only allow in privileged code
1929       return _method_InjectedProfile;
1930     }
1931     case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): {
1932       if (_location != _in_method)  break;  // only allow for methods
1933       if (!privileged)              break;  // only allow in privileged code
1934       return _method_LambdaForm_Compiled;
1935     }
1936     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): {
1937       if (_location != _in_method)  break;  // only allow for methods
1938       if (!privileged)              break;  // only allow in privileged code
1939       return _method_Hidden;
1940     }
1941     case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): {
1942       if (_location != _in_method)  break;  // only allow for methods
1943       if (!privileged)              break;  // only allow in privileged code
1944       return _method_Scoped;
1945     }
1946     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): {
1947       if (_location != _in_method)  break;  // only allow for methods
1948       if (!privileged)              break;  // only allow in privileged code
1949       return _method_IntrinsicCandidate;
1950     }
1951     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): {
1952       if (_location != _in_field)   break;  // only allow for fields
1953       if (!privileged)              break;  // only allow in privileged code
1954       return _field_Stable;
1955     }
1956     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): {
1957       if (_location != _in_field && _location != _in_class) {
1958         break;  // only allow for fields and classes
1959       }
1960       if (!EnableContended || (RestrictContended && !privileged)) {
1961         break;  // honor privileges
1962       }
1963       return _jdk_internal_vm_annotation_Contended;
1964     }
1965     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): {
1966       if (_location != _in_method)  break;  // only allow for methods
1967       if (RestrictReservedStack && !privileged) break; // honor privileges
1968       return _jdk_internal_vm_annotation_ReservedStackAccess;
1969     }
1970     case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): {
1971       if (_location != _in_class)   break;  // only allow for classes
1972       if (!privileged)              break;  // only allow in privileged code
1973       return _jdk_internal_ValueBased;
1974     }
1975     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_LooselyConsistentValue_signature): {
1976       if (_location != _in_class)   break; // only allow for classes
1977       return _jdk_internal_LooselyConsistentValue;
1978     }
1979     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_NullRestricted_signature): {
1980       if (_location != _in_field)   break; // only allow for fields
1981       return _jdk_internal_NullRestricted;
1982     }
1983     case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): {
1984       return _java_lang_Deprecated;
1985     }
1986     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTSafeClassInitializer_signature): {
1987       if (_location != _in_class)   break;  // only allow for classes
1988       if (!privileged)              break;  // only allow in privileged code
1989       return _jdk_internal_vm_annotation_AOTSafeClassInitializer;
1990     }
1991     case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_AOTRuntimeSetup_signature): {
1992       if (_location != _in_method)  break;  // only allow for methods
1993       if (!privileged)              break;  // only allow in privileged code
1994       return _method_AOTRuntimeSetup;
1995     }
1996     default: {
1997       break;
1998     }
1999   }
2000   return AnnotationCollector::_unknown;
2001 }
2002 
2003 void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) {
2004   if (is_contended())
2005     // Setting the contended group also sets the contended bit in field flags
2006     f->set_contended_group(contended_group());
2007   if (is_stable())
2008     (f->field_flags_addr())->update_stable(true);
2009 }
2010 
2011 ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() {
2012   // If there's an error deallocate metadata for field annotations
2013   MetadataFactory::free_array<u1>(_loader_data, _field_annotations);
2014   MetadataFactory::free_array<u1>(_loader_data, _field_type_annotations);
2015 }
2016 
2017 void MethodAnnotationCollector::apply_to(const methodHandle& m) {
2018   if (has_annotation(_method_CallerSensitive))
2019     m->set_caller_sensitive();
2020   if (has_annotation(_method_ForceInline))
2021     m->set_force_inline();
2022   if (has_annotation(_method_DontInline))
2023     m->set_dont_inline();
2024   if (has_annotation(_method_ChangesCurrentThread))
2025     m->set_changes_current_thread();
2026   if (has_annotation(_method_JvmtiHideEvents))
2027     m->set_jvmti_hide_events();
2028   if (has_annotation(_method_JvmtiMountTransition))
2029     m->set_jvmti_mount_transition();
2030   if (has_annotation(_method_InjectedProfile))
2031     m->set_has_injected_profile();
2032   if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none)
2033     m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm);
2034   if (has_annotation(_method_Hidden))
2035     m->set_is_hidden();
2036   if (has_annotation(_method_Scoped))
2037     m->set_scoped();
2038   if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic())
2039     m->set_intrinsic_candidate();
2040   if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess))
2041     m->set_has_reserved_stack_access();
2042   if (has_annotation(_java_lang_Deprecated))
2043     m->set_deprecated();
2044   if (has_annotation(_java_lang_Deprecated_for_removal))
2045     m->set_deprecated_for_removal();
2046 }
2047 
2048 void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) {
2049   assert(ik != nullptr, "invariant");
2050   if (has_annotation(_jdk_internal_vm_annotation_Contended)) {
2051     ik->set_is_contended(is_contended());
2052   }
2053   if (has_annotation(_jdk_internal_ValueBased)) {
2054     ik->set_has_value_based_class_annotation();
2055     if (DiagnoseSyncOnValueBasedClasses) {
2056       ik->set_is_value_based();
2057     }
2058   }
2059   if (has_annotation(_java_lang_Deprecated)) {
2060     Array<Method*>* methods = ik->methods();
2061     int length = ik->methods()->length();
2062     for (int i = 0; i < length; i++) {
2063       Method* m = methods->at(i);
2064       m->set_deprecated();
2065     }
2066   }
2067   if (has_annotation(_java_lang_Deprecated_for_removal)) {
2068     Array<Method*>* methods = ik->methods();
2069     int length = ik->methods()->length();
2070     for (int i = 0; i < length; i++) {
2071       Method* m = methods->at(i);
2072       m->set_deprecated_for_removal();
2073     }
2074   }
2075   if (has_annotation(_jdk_internal_vm_annotation_AOTSafeClassInitializer)) {
2076     ik->set_has_aot_safe_initializer();
2077   }
2078 }
2079 
2080 #define MAX_ARGS_SIZE 255
2081 #define MAX_CODE_SIZE 65535
2082 #define INITIAL_MAX_LVT_NUMBER 256
2083 
2084 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2085  *
2086  * Rules for LVT's and LVTT's are:
2087  *   - There can be any number of LVT's and LVTT's.
2088  *   - If there are n LVT's, it is the same as if there was just
2089  *     one LVT containing all the entries from the n LVT's.
2090  *   - There may be no more than one LVT entry per local variable.
2091  *     Two LVT entries are 'equal' if these fields are the same:
2092  *        start_pc, length, name, slot
2093  *   - There may be no more than one LVTT entry per each LVT entry.
2094  *     Each LVTT entry has to match some LVT entry.
2095  *   - HotSpot internal LVT keeps natural ordering of class file LVT entries.
2096  */
2097 void ClassFileParser::copy_localvariable_table(const ConstMethod* cm,
2098                                                int lvt_cnt,
2099                                                u2* const localvariable_table_length,
2100                                                const unsafe_u2** const localvariable_table_start,
2101                                                int lvtt_cnt,
2102                                                u2* const localvariable_type_table_length,
2103                                                const unsafe_u2** const localvariable_type_table_start,
2104                                                TRAPS) {
2105 
2106   ResourceMark rm(THREAD);
2107 
2108   typedef HashTable<LocalVariableTableElement, LocalVariableTableElement*,
2109                             256, AnyObj::RESOURCE_AREA, mtInternal,
2110                             &LVT_Hash::hash, &LVT_Hash::equals> LVT_HashTable;
2111 
2112   LVT_HashTable* const table = new LVT_HashTable();
2113 
2114   // To fill LocalVariableTable in
2115   const Classfile_LVT_Element* cf_lvt;
2116   LocalVariableTableElement* lvt = cm->localvariable_table_start();
2117 
2118   for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) {
2119     cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no];
2120     for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) {
2121       copy_lvt_element(&cf_lvt[idx], lvt);
2122       // If no duplicates, add LVT elem in hashtable.
2123       if (table->put(*lvt, lvt) == false
2124           && _need_verify
2125           && _major_version >= JAVA_1_5_VERSION) {
2126         classfile_parse_error("Duplicated LocalVariableTable attribute "
2127                               "entry for '%s' in class file %s",
2128                                _cp->symbol_at(lvt->name_cp_index)->as_utf8(),
2129                                THREAD);
2130         return;
2131       }
2132     }
2133   }
2134 
2135   // To merge LocalVariableTable and LocalVariableTypeTable
2136   const Classfile_LVT_Element* cf_lvtt;
2137   LocalVariableTableElement lvtt_elem;
2138 
2139   for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) {
2140     cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no];
2141     for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) {
2142       copy_lvt_element(&cf_lvtt[idx], &lvtt_elem);
2143       LocalVariableTableElement** entry = table->get(lvtt_elem);
2144       if (entry == nullptr) {
2145         if (_need_verify) {
2146           classfile_parse_error("LVTT entry for '%s' in class file %s "
2147                                 "does not match any LVT entry",
2148                                  _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2149                                  THREAD);
2150           return;
2151         }
2152       } else if ((*entry)->signature_cp_index != 0 && _need_verify) {
2153         classfile_parse_error("Duplicated LocalVariableTypeTable attribute "
2154                               "entry for '%s' in class file %s",
2155                                _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(),
2156                                THREAD);
2157         return;
2158       } else {
2159         // to add generic signatures into LocalVariableTable
2160         (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index;
2161       }
2162     }
2163   }
2164 }
2165 
2166 
2167 void ClassFileParser::copy_method_annotations(ConstMethod* cm,
2168                                        const u1* runtime_visible_annotations,
2169                                        int runtime_visible_annotations_length,
2170                                        const u1* runtime_visible_parameter_annotations,
2171                                        int runtime_visible_parameter_annotations_length,
2172                                        const u1* runtime_visible_type_annotations,
2173                                        int runtime_visible_type_annotations_length,
2174                                        const u1* annotation_default,
2175                                        int annotation_default_length,
2176                                        TRAPS) {
2177 
2178   AnnotationArray* a;
2179 
2180   if (runtime_visible_annotations_length > 0) {
2181      a = allocate_annotations(runtime_visible_annotations,
2182                               runtime_visible_annotations_length,
2183                               CHECK);
2184      cm->set_method_annotations(a);
2185   }
2186 
2187   if (runtime_visible_parameter_annotations_length > 0) {
2188     a = allocate_annotations(runtime_visible_parameter_annotations,
2189                              runtime_visible_parameter_annotations_length,
2190                              CHECK);
2191     cm->set_parameter_annotations(a);
2192   }
2193 
2194   if (annotation_default_length > 0) {
2195     a = allocate_annotations(annotation_default,
2196                              annotation_default_length,
2197                              CHECK);
2198     cm->set_default_annotations(a);
2199   }
2200 
2201   if (runtime_visible_type_annotations_length > 0) {
2202     a = allocate_annotations(runtime_visible_type_annotations,
2203                              runtime_visible_type_annotations_length,
2204                              CHECK);
2205     cm->set_type_annotations(a);
2206   }
2207 }
2208 
2209 
2210 // Note: the parse_method below is big and clunky because all parsing of the code and exceptions
2211 // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the
2212 // Method* to save footprint, so we only know the size of the resulting Method* when the
2213 // entire method attribute is parsed.
2214 //
2215 // The has_localvariable_table parameter is used to pass up the value to InstanceKlass.
2216 
2217 Method* ClassFileParser::parse_method(const ClassFileStream* const cfs,
2218                                       bool is_interface,
2219                                       bool is_value_class,
2220                                       bool is_abstract_class,
2221                                       const ConstantPool* cp,
2222                                       bool* const has_localvariable_table,
2223                                       TRAPS) {
2224   assert(cfs != nullptr, "invariant");
2225   assert(cp != nullptr, "invariant");
2226   assert(has_localvariable_table != nullptr, "invariant");
2227 
2228   ResourceMark rm(THREAD);
2229   // Parse fixed parts:
2230   // access_flags, name_index, descriptor_index, attributes_count
2231   cfs->guarantee_more(8, CHECK_NULL);
2232 
2233   u2 flags = cfs->get_u2_fast();
2234   const u2 name_index = cfs->get_u2_fast();
2235   const int cp_size = cp->length();
2236   guarantee_property(
2237     valid_symbol_at(name_index),
2238     "Illegal constant pool index %u for method name in class file %s",
2239     name_index, CHECK_NULL);
2240   const Symbol* const name = cp->symbol_at(name_index);
2241   verify_legal_method_name(name, CHECK_NULL);
2242 
2243   const u2 signature_index = cfs->get_u2_fast();
2244   guarantee_property(
2245     valid_symbol_at(signature_index),
2246     "Illegal constant pool index %u for method signature in class file %s",
2247     signature_index, CHECK_NULL);
2248   const Symbol* const signature = cp->symbol_at(signature_index);
2249 
2250   if (name == vmSymbols::class_initializer_name()) {
2251     // We ignore the other access flags for a valid class initializer.
2252     // (JVM Spec 2nd ed., chapter 4.6)
2253     if (_major_version < 51) { // backward compatibility
2254       flags = JVM_ACC_STATIC;
2255     } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) {
2256       flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0);
2257     } else {
2258       classfile_parse_error("Method <clinit> is not static in class file %s", THREAD);
2259       return nullptr;
2260     }
2261   } else {
2262     verify_legal_method_modifiers(flags, access_flags() , name, CHECK_NULL);
2263   }
2264 
2265   if (name == vmSymbols::object_initializer_name() && is_interface) {
2266     classfile_parse_error("Interface cannot have a method named <init>, class file %s", THREAD);
2267     return nullptr;
2268   }
2269 
2270   if (Arguments::is_valhalla_enabled()) {
2271     if (((flags & JVM_ACC_SYNCHRONIZED) == JVM_ACC_SYNCHRONIZED)
2272         && ((flags & JVM_ACC_STATIC) == 0 )
2273         && !_access_flags.is_identity_class()) {
2274       classfile_parse_error("Invalid synchronized method in non-identity class %s", THREAD);
2275         return nullptr;
2276     }
2277   }
2278 
2279   int args_size = -1;  // only used when _need_verify is true
2280   if (_need_verify) {
2281     verify_legal_name_with_signature(name, signature, CHECK_NULL);
2282     args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) +
2283                  verify_legal_method_signature(name, signature, CHECK_NULL);
2284     if (args_size > MAX_ARGS_SIZE) {
2285       classfile_parse_error("Too many arguments in method signature in class file %s", THREAD);
2286       return nullptr;
2287     }
2288   }
2289 
2290   AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS);
2291 
2292   // Default values for code and exceptions attribute elements
2293   u2 max_stack = 0;
2294   u2 max_locals = 0;
2295   u4 code_length = 0;
2296   const u1* code_start = nullptr;
2297   u2 exception_table_length = 0;
2298   const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2299   Array<int>* exception_handlers = Universe::the_empty_int_array();
2300   u2 checked_exceptions_length = 0;
2301   const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements
2302   CompressedLineNumberWriteStream* linenumber_table = nullptr;
2303   int linenumber_table_length = 0;
2304   int total_lvt_length = 0;
2305   u2 lvt_cnt = 0;
2306   u2 lvtt_cnt = 0;
2307   bool lvt_allocated = false;
2308   u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER;
2309   u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER;
2310   u2* localvariable_table_length = nullptr;
2311   const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes
2312   u2* localvariable_type_table_length = nullptr;
2313   const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes
2314   int method_parameters_length = -1;
2315   const u1* method_parameters_data = nullptr;
2316   bool method_parameters_seen = false;
2317   bool parsed_code_attribute = false;
2318   bool parsed_checked_exceptions_attribute = false;
2319   bool parsed_stackmap_attribute = false;
2320   // stackmap attribute - JDK1.5
2321   const u1* stackmap_data = nullptr;
2322   int stackmap_data_length = 0;
2323   u2 generic_signature_index = 0;
2324   MethodAnnotationCollector parsed_annotations;
2325   const u1* runtime_visible_annotations = nullptr;
2326   int runtime_visible_annotations_length = 0;
2327   const u1* runtime_visible_parameter_annotations = nullptr;
2328   int runtime_visible_parameter_annotations_length = 0;
2329   const u1* runtime_visible_type_annotations = nullptr;
2330   int runtime_visible_type_annotations_length = 0;
2331   bool runtime_invisible_annotations_exists = false;
2332   bool runtime_invisible_type_annotations_exists = false;
2333   bool runtime_invisible_parameter_annotations_exists = false;
2334   const u1* annotation_default = nullptr;
2335   int annotation_default_length = 0;
2336 
2337   // Parse code and exceptions attribute
2338   u2 method_attributes_count = cfs->get_u2_fast();
2339   while (method_attributes_count--) {
2340     cfs->guarantee_more(6, CHECK_NULL);  // method_attribute_name_index, method_attribute_length
2341     const u2 method_attribute_name_index = cfs->get_u2_fast();
2342     const u4 method_attribute_length = cfs->get_u4_fast();
2343     guarantee_property(
2344       valid_symbol_at(method_attribute_name_index),
2345       "Invalid method attribute name index %u in class file %s",
2346       method_attribute_name_index, CHECK_NULL);
2347 
2348     const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index);
2349     if (method_attribute_name == vmSymbols::tag_code()) {
2350       // Parse Code attribute
2351       if (_need_verify) {
2352         guarantee_property(
2353             !access_flags.is_native() && !access_flags.is_abstract(),
2354                         "Code attribute in native or abstract methods in class file %s",
2355                          CHECK_NULL);
2356       }
2357       if (parsed_code_attribute) {
2358         classfile_parse_error("Multiple Code attributes in class file %s",
2359                               THREAD);
2360         return nullptr;
2361       }
2362       parsed_code_attribute = true;
2363 
2364       // Stack size, locals size, and code size
2365       cfs->guarantee_more(8, CHECK_NULL);
2366       max_stack = cfs->get_u2_fast();
2367       max_locals = cfs->get_u2_fast();
2368       code_length = cfs->get_u4_fast();
2369       if (_need_verify) {
2370         guarantee_property(args_size <= max_locals,
2371                            "Arguments can't fit into locals in class file %s",
2372                            CHECK_NULL);
2373         guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE,
2374                            "Invalid method Code length %u in class file %s",
2375                            code_length, CHECK_NULL);
2376       }
2377       // Code pointer
2378       code_start = cfs->current();
2379       assert(code_start != nullptr, "null code start");
2380       cfs->guarantee_more(code_length, CHECK_NULL);
2381       cfs->skip_u1_fast(code_length);
2382 
2383       // Exception handler table
2384       cfs->guarantee_more(2, CHECK_NULL);  // exception_table_length
2385       exception_table_length = cfs->get_u2_fast();
2386       if (exception_table_length > 0) {
2387         exception_table_start = parse_exception_table(cfs,
2388                                                       code_length,
2389                                                       exception_table_length,
2390                                                       CHECK_NULL);
2391       }
2392 
2393       // Parse additional attributes in code attribute
2394       cfs->guarantee_more(2, CHECK_NULL);  // code_attributes_count
2395       u2 code_attributes_count = cfs->get_u2_fast();
2396 
2397       unsigned int calculated_attribute_length = 0;
2398 
2399       calculated_attribute_length =
2400           sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length);
2401       calculated_attribute_length += checked_cast<unsigned int>(
2402         code_length +
2403         sizeof(exception_table_length) +
2404         sizeof(code_attributes_count) +
2405         exception_table_length *
2406             ( sizeof(u2) +   // start_pc
2407               sizeof(u2) +   // end_pc
2408               sizeof(u2) +   // handler_pc
2409               sizeof(u2) )); // catch_type_index
2410 
2411       while (code_attributes_count--) {
2412         cfs->guarantee_more(6, CHECK_NULL);  // code_attribute_name_index, code_attribute_length
2413         const u2 code_attribute_name_index = cfs->get_u2_fast();
2414         const u4 code_attribute_length = cfs->get_u4_fast();
2415         calculated_attribute_length += code_attribute_length +
2416                                        (unsigned)sizeof(code_attribute_name_index) +
2417                                        (unsigned)sizeof(code_attribute_length);
2418         guarantee_property(valid_symbol_at(code_attribute_name_index),
2419                            "Invalid code attribute name index %u in class file %s",
2420                            code_attribute_name_index,
2421                            CHECK_NULL);
2422         if (LoadLineNumberTables &&
2423             cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) {
2424           // Parse and compress line number table
2425           parse_linenumber_table(code_attribute_length,
2426                                  code_length,
2427                                  &linenumber_table,
2428                                  CHECK_NULL);
2429 
2430         } else if (LoadLocalVariableTables &&
2431                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) {
2432           // Parse local variable table
2433           if (!lvt_allocated) {
2434             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2435               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2436             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2437               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2438             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2439               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2440             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2441               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2442             lvt_allocated = true;
2443           }
2444           if (lvt_cnt == max_lvt_cnt) {
2445             max_lvt_cnt <<= 1;
2446             localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt);
2447             localvariable_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt);
2448           }
2449           localvariable_table_start[lvt_cnt] =
2450             parse_localvariable_table(cfs,
2451                                       code_length,
2452                                       max_locals,
2453                                       code_attribute_length,
2454                                       &localvariable_table_length[lvt_cnt],
2455                                       false,    // is not LVTT
2456                                       CHECK_NULL);
2457           total_lvt_length += localvariable_table_length[lvt_cnt];
2458           lvt_cnt++;
2459         } else if (LoadLocalVariableTypeTables &&
2460                    _major_version >= JAVA_1_5_VERSION &&
2461                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) {
2462           if (!lvt_allocated) {
2463             localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2464               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2465             localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2466               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2467             localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD(
2468               THREAD, u2,  INITIAL_MAX_LVT_NUMBER);
2469             localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD(
2470               THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER);
2471             lvt_allocated = true;
2472           }
2473           // Parse local variable type table
2474           if (lvtt_cnt == max_lvtt_cnt) {
2475             max_lvtt_cnt <<= 1;
2476             localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt);
2477             localvariable_type_table_start  = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt);
2478           }
2479           localvariable_type_table_start[lvtt_cnt] =
2480             parse_localvariable_table(cfs,
2481                                       code_length,
2482                                       max_locals,
2483                                       code_attribute_length,
2484                                       &localvariable_type_table_length[lvtt_cnt],
2485                                       true,     // is LVTT
2486                                       CHECK_NULL);
2487           lvtt_cnt++;
2488         } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION &&
2489                    cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) {
2490           // Stack map is only needed by the new verifier in JDK1.5.
2491           if (parsed_stackmap_attribute) {
2492             classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD);
2493             return nullptr;
2494           }
2495           stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL);
2496           stackmap_data_length = code_attribute_length;
2497           parsed_stackmap_attribute = true;
2498         } else {
2499           // Skip unknown attributes
2500           cfs->skip_u1(code_attribute_length, CHECK_NULL);
2501         }
2502       }
2503       // check method attribute length
2504       if (_need_verify) {
2505         guarantee_property(method_attribute_length == calculated_attribute_length,
2506                            "Code segment has wrong length in class file %s",
2507                            CHECK_NULL);
2508       }
2509     } else if (method_attribute_name == vmSymbols::tag_exceptions()) {
2510       // Parse Exceptions attribute
2511       if (parsed_checked_exceptions_attribute) {
2512         classfile_parse_error("Multiple Exceptions attributes in class file %s",
2513                               THREAD);
2514         return nullptr;
2515       }
2516       parsed_checked_exceptions_attribute = true;
2517       checked_exceptions_start =
2518             parse_checked_exceptions(cfs,
2519                                      &checked_exceptions_length,
2520                                      method_attribute_length,
2521                                      CHECK_NULL);
2522     } else if (method_attribute_name == vmSymbols::tag_method_parameters()) {
2523       // reject multiple method parameters
2524       if (method_parameters_seen) {
2525         classfile_parse_error("Multiple MethodParameters attributes in class file %s",
2526                               THREAD);
2527         return nullptr;
2528       }
2529       method_parameters_seen = true;
2530       method_parameters_length = cfs->get_u1_fast();
2531       const u4 real_length = (method_parameters_length * 4u) + 1u;
2532       if (method_attribute_length != real_length) {
2533         classfile_parse_error(
2534           "Invalid MethodParameters method attribute length %u in class file",
2535           method_attribute_length, THREAD);
2536         return nullptr;
2537       }
2538       method_parameters_data = cfs->current();
2539       cfs->skip_u2_fast(method_parameters_length);
2540       cfs->skip_u2_fast(method_parameters_length);
2541       // ignore this attribute if it cannot be reflected
2542       if (!vmClasses::reflect_Parameter_klass_is_loaded())
2543         method_parameters_length = -1;
2544     } else if (method_attribute_name == vmSymbols::tag_synthetic()) {
2545       if (method_attribute_length != 0) {
2546         classfile_parse_error(
2547           "Invalid Synthetic method attribute length %u in class file %s",
2548           method_attribute_length, THREAD);
2549         return nullptr;
2550       }
2551       // Should we check that there hasn't already been a synthetic attribute?
2552       access_flags.set_is_synthetic();
2553     } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120
2554       if (method_attribute_length != 0) {
2555         classfile_parse_error(
2556           "Invalid Deprecated method attribute length %u in class file %s",
2557           method_attribute_length, THREAD);
2558         return nullptr;
2559       }
2560     } else if (_major_version >= JAVA_1_5_VERSION) {
2561       if (method_attribute_name == vmSymbols::tag_signature()) {
2562         if (generic_signature_index != 0) {
2563           classfile_parse_error(
2564             "Multiple Signature attributes for method in class file %s",
2565             THREAD);
2566           return nullptr;
2567         }
2568         if (method_attribute_length != 2) {
2569           classfile_parse_error(
2570             "Invalid Signature attribute length %u in class file %s",
2571             method_attribute_length, THREAD);
2572           return nullptr;
2573         }
2574         generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL);
2575       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
2576         if (runtime_visible_annotations != nullptr) {
2577           classfile_parse_error(
2578             "Multiple RuntimeVisibleAnnotations attributes for method in class file %s",
2579             THREAD);
2580           return nullptr;
2581         }
2582         runtime_visible_annotations_length = method_attribute_length;
2583         runtime_visible_annotations = cfs->current();
2584         assert(runtime_visible_annotations != nullptr, "null visible annotations");
2585         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL);
2586         parse_annotations(cp,
2587                           runtime_visible_annotations,
2588                           runtime_visible_annotations_length,
2589                           &parsed_annotations,
2590                           _loader_data,
2591                           _can_access_vm_annotations);
2592         cfs->skip_u1_fast(runtime_visible_annotations_length);
2593       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
2594         if (runtime_invisible_annotations_exists) {
2595           classfile_parse_error(
2596             "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s",
2597             THREAD);
2598           return nullptr;
2599         }
2600         runtime_invisible_annotations_exists = true;
2601         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2602       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) {
2603         if (runtime_visible_parameter_annotations != nullptr) {
2604           classfile_parse_error(
2605             "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s",
2606             THREAD);
2607           return nullptr;
2608         }
2609         runtime_visible_parameter_annotations_length = method_attribute_length;
2610         runtime_visible_parameter_annotations = cfs->current();
2611         assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations");
2612         cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL);
2613       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) {
2614         if (runtime_invisible_parameter_annotations_exists) {
2615           classfile_parse_error(
2616             "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s",
2617             THREAD);
2618           return nullptr;
2619         }
2620         runtime_invisible_parameter_annotations_exists = true;
2621         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2622       } else if (method_attribute_name == vmSymbols::tag_annotation_default()) {
2623         if (annotation_default != nullptr) {
2624           classfile_parse_error(
2625             "Multiple AnnotationDefault attributes for method in class file %s",
2626             THREAD);
2627           return nullptr;
2628         }
2629         annotation_default_length = method_attribute_length;
2630         annotation_default = cfs->current();
2631         assert(annotation_default != nullptr, "null annotation default");
2632         cfs->skip_u1(annotation_default_length, CHECK_NULL);
2633       } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
2634         if (runtime_visible_type_annotations != nullptr) {
2635           classfile_parse_error(
2636             "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s",
2637             THREAD);
2638           return nullptr;
2639         }
2640         runtime_visible_type_annotations_length = method_attribute_length;
2641         runtime_visible_type_annotations = cfs->current();
2642         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
2643         // No need for the VM to parse Type annotations
2644         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL);
2645       } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
2646         if (runtime_invisible_type_annotations_exists) {
2647           classfile_parse_error(
2648             "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s",
2649             THREAD);
2650           return nullptr;
2651         }
2652         runtime_invisible_type_annotations_exists = true;
2653         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2654       } else {
2655         // Skip unknown attributes
2656         cfs->skip_u1(method_attribute_length, CHECK_NULL);
2657       }
2658     } else {
2659       // Skip unknown attributes
2660       cfs->skip_u1(method_attribute_length, CHECK_NULL);
2661     }
2662   }
2663 
2664   if (linenumber_table != nullptr) {
2665     linenumber_table->write_terminator();
2666     linenumber_table_length = linenumber_table->position();
2667   }
2668 
2669   // Make sure there's at least one Code attribute in non-native/non-abstract method
2670   if (_need_verify) {
2671     guarantee_property(access_flags.is_native() ||
2672                        access_flags.is_abstract() ||
2673                        parsed_code_attribute,
2674                        "Absent Code attribute in method that is not native or abstract in class file %s",
2675                        CHECK_NULL);
2676   }
2677 
2678   // All sizing information for a Method* is finally available, now create it
2679   InlineTableSizes sizes(
2680       total_lvt_length,
2681       linenumber_table_length,
2682       exception_table_length,
2683       checked_exceptions_length,
2684       method_parameters_length,
2685       generic_signature_index,
2686       runtime_visible_annotations_length,
2687       runtime_visible_parameter_annotations_length,
2688       runtime_visible_type_annotations_length,
2689       annotation_default_length,
2690       0);
2691 
2692   Method* const m = Method::allocate(_loader_data,
2693                                      code_length,
2694                                      access_flags,
2695                                      &sizes,
2696                                      ConstMethod::NORMAL,
2697                                      _cp->symbol_at(name_index),
2698                                      CHECK_NULL);
2699 
2700   ClassLoadingService::add_class_method_size(m->size()*wordSize);
2701 
2702   // Fill in information from fixed part (access_flags already set)
2703   m->set_constants(_cp);
2704   m->set_name_index(name_index);
2705   m->set_signature_index(signature_index);
2706   m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static());
2707   assert(args_size < 0 || args_size == m->size_of_parameters(), "");
2708 
2709   // Fill in code attribute information
2710   m->set_max_stack(max_stack);
2711   m->set_max_locals(max_locals);
2712   if (stackmap_data != nullptr) {
2713     m->constMethod()->copy_stackmap_data(_loader_data,
2714                                          (u1*)stackmap_data,
2715                                          stackmap_data_length,
2716                                          CHECK_NULL);
2717   }
2718 
2719   // Copy byte codes
2720   m->set_code((u1*)code_start);
2721 
2722   // Copy line number table
2723   if (linenumber_table != nullptr) {
2724     memcpy(m->compressed_linenumber_table(),
2725            linenumber_table->buffer(),
2726            linenumber_table_length);
2727   }
2728 
2729   // Copy exception table
2730   if (exception_table_length > 0) {
2731     Copy::conjoint_swap_if_needed<Endian::JAVA>(exception_table_start,
2732                                                 m->exception_table_start(),
2733                                                 exception_table_length * sizeof(ExceptionTableElement),
2734                                                 sizeof(u2));
2735   }
2736 
2737   // Copy method parameters
2738   if (method_parameters_length > 0) {
2739     MethodParametersElement* elem = m->constMethod()->method_parameters_start();
2740     for (int i = 0; i < method_parameters_length; i++) {
2741       elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data);
2742       method_parameters_data += 2;
2743       elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data);
2744       method_parameters_data += 2;
2745     }
2746   }
2747 
2748   // Copy checked exceptions
2749   if (checked_exceptions_length > 0) {
2750     Copy::conjoint_swap_if_needed<Endian::JAVA>(checked_exceptions_start,
2751                                                 m->checked_exceptions_start(),
2752                                                 checked_exceptions_length * sizeof(CheckedExceptionElement),
2753                                                 sizeof(u2));
2754   }
2755 
2756   // Copy class file LVT's/LVTT's into the HotSpot internal LVT.
2757   if (total_lvt_length > 0) {
2758     *has_localvariable_table = true;
2759     copy_localvariable_table(m->constMethod(),
2760                              lvt_cnt,
2761                              localvariable_table_length,
2762                              localvariable_table_start,
2763                              lvtt_cnt,
2764                              localvariable_type_table_length,
2765                              localvariable_type_table_start,
2766                              CHECK_NULL);
2767   }
2768 
2769   if (parsed_annotations.has_any_annotations())
2770     parsed_annotations.apply_to(methodHandle(THREAD, m));
2771 
2772   if (is_hidden()) { // Mark methods in hidden classes as 'hidden'.
2773     m->set_is_hidden();
2774   }
2775   if (parsed_annotations.has_aot_runtime_setup()) {
2776     if (name != vmSymbols::runtimeSetup() || signature != vmSymbols::void_method_signature() ||
2777         !access_flags.is_private() || !access_flags.is_static()) {
2778       classfile_parse_error("@AOTRuntimeSetup method must be declared private static void runtimeSetup() for class %s", CHECK_NULL);
2779     }
2780     _has_aot_runtime_setup_method = true;
2781   }
2782 
2783   // Copy annotations
2784   copy_method_annotations(m->constMethod(),
2785                           runtime_visible_annotations,
2786                           runtime_visible_annotations_length,
2787                           runtime_visible_parameter_annotations,
2788                           runtime_visible_parameter_annotations_length,
2789                           runtime_visible_type_annotations,
2790                           runtime_visible_type_annotations_length,
2791                           annotation_default,
2792                           annotation_default_length,
2793                           CHECK_NULL);
2794 
2795   if (InstanceKlass::is_finalization_enabled() &&
2796       name == vmSymbols::finalize_method_name() &&
2797       signature == vmSymbols::void_method_signature()) {
2798     if (m->is_empty_method()) {
2799       _has_empty_finalizer = true;
2800     } else {
2801       _has_finalizer = true;
2802     }
2803   }
2804 
2805   NOT_PRODUCT(m->verify());
2806   return m;
2807 }
2808 
2809 
2810 // Side-effects: populates the _methods field in the parser
2811 void ClassFileParser::parse_methods(const ClassFileStream* const cfs,
2812                                     bool is_interface,
2813                                     bool is_value_class,
2814                                     bool is_abstract_type,
2815                                     bool* const has_localvariable_table,
2816                                     bool* has_final_method,
2817                                     bool* declares_nonstatic_concrete_methods,
2818                                     TRAPS) {
2819   assert(cfs != nullptr, "invariant");
2820   assert(has_localvariable_table != nullptr, "invariant");
2821   assert(has_final_method != nullptr, "invariant");
2822   assert(declares_nonstatic_concrete_methods != nullptr, "invariant");
2823 
2824   assert(nullptr == _methods, "invariant");
2825 
2826   cfs->guarantee_more(2, CHECK);  // length
2827   const u2 length = cfs->get_u2_fast();
2828   if (length == 0) {
2829     _methods = Universe::the_empty_method_array();
2830   } else {
2831     _methods = MetadataFactory::new_array<Method*>(_loader_data,
2832                                                    length,
2833                                                    nullptr,
2834                                                    CHECK);
2835 
2836     for (int index = 0; index < length; index++) {
2837       Method* method = parse_method(cfs,
2838                                     is_interface,
2839                                     is_value_class,
2840                                     is_abstract_type,
2841                                     _cp,
2842                                     has_localvariable_table,
2843                                     CHECK);
2844 
2845       if (method->is_final()) {
2846         *has_final_method = true;
2847       }
2848       // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags
2849       // used for interface initialization, and default method inheritance analysis
2850       if (is_interface && !(*declares_nonstatic_concrete_methods)
2851         && !method->is_abstract() && !method->is_static()) {
2852         *declares_nonstatic_concrete_methods = true;
2853       }
2854       _methods->at_put(index, method);
2855     }
2856 
2857     if (_need_verify && length > 1) {
2858       // Check duplicated methods
2859       ResourceMark rm(THREAD);
2860       // Set containing name-signature pairs
2861       NameSigHashtable* names_and_sigs = new NameSigHashtable();
2862       for (int i = 0; i < length; i++) {
2863         const Method* const m = _methods->at(i);
2864         NameSigHash name_and_sig(m->name(), m->signature());
2865         // If no duplicates, add name/signature in hashtable names_and_sigs.
2866         if(!names_and_sigs->put(name_and_sig, 0)) {
2867           classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s",
2868                                  name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD);
2869           return;
2870         }
2871       }
2872     }
2873   }
2874 }
2875 
2876 static const intArray* sort_methods(Array<Method*>* methods) {
2877   const int length = methods->length();
2878   // If JVMTI original method ordering or sharing is enabled we have to
2879   // remember the original class file ordering.
2880   // We temporarily use the vtable_index field in the Method* to store the
2881   // class file index, so we can read in after calling qsort.
2882   // Put the method ordering in the shared archive.
2883   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2884     for (int index = 0; index < length; index++) {
2885       Method* const m = methods->at(index);
2886       assert(!m->valid_vtable_index(), "vtable index should not be set");
2887       m->set_vtable_index(index);
2888     }
2889   }
2890   // Sort method array by ascending method name (for faster lookups & vtable construction)
2891   // Note that the ordering is not alphabetical, see Symbol::fast_compare
2892   Method::sort_methods(methods);
2893 
2894   intArray* method_ordering = nullptr;
2895   // If JVMTI original method ordering or sharing is enabled construct int
2896   // array remembering the original ordering
2897   if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) {
2898     method_ordering = new intArray(length, length, -1);
2899     for (int index = 0; index < length; index++) {
2900       Method* const m = methods->at(index);
2901       const int old_index = m->vtable_index();
2902       assert(old_index >= 0 && old_index < length, "invalid method index");
2903       method_ordering->at_put(index, old_index);
2904       m->set_vtable_index(Method::invalid_vtable_index);
2905     }
2906   }
2907   return method_ordering;
2908 }
2909 
2910 // Parse generic_signature attribute for methods and fields
2911 u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs,
2912                                                       TRAPS) {
2913   assert(cfs != nullptr, "invariant");
2914 
2915   cfs->guarantee_more(2, CHECK_0);  // generic_signature_index
2916   const u2 generic_signature_index = cfs->get_u2_fast();
2917   guarantee_property(
2918     valid_symbol_at(generic_signature_index),
2919     "Invalid Signature attribute at constant pool index %u in class file %s",
2920     generic_signature_index, CHECK_0);
2921   return generic_signature_index;
2922 }
2923 
2924 void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs,
2925                                                            TRAPS) {
2926 
2927   assert(cfs != nullptr, "invariant");
2928 
2929   cfs->guarantee_more(2, CHECK);  // sourcefile_index
2930   const u2 sourcefile_index = cfs->get_u2_fast();
2931   guarantee_property(
2932     valid_symbol_at(sourcefile_index),
2933     "Invalid SourceFile attribute at constant pool index %u in class file %s",
2934     sourcefile_index, CHECK);
2935   set_class_sourcefile_index(sourcefile_index);
2936 }
2937 
2938 void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs,
2939                                                                        int length,
2940                                                                        TRAPS) {
2941   assert(cfs != nullptr, "invariant");
2942 
2943   const u1* const sde_buffer = cfs->current();
2944   assert(sde_buffer != nullptr, "null sde buffer");
2945 
2946   // Don't bother storing it if there is no way to retrieve it
2947   if (JvmtiExport::can_get_source_debug_extension()) {
2948     assert((length+1) > length, "Overflow checking");
2949     u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1);
2950     for (int i = 0; i < length; i++) {
2951       sde[i] = sde_buffer[i];
2952     }
2953     sde[length] = '\0';
2954     set_class_sde_buffer((const char*)sde, length);
2955   }
2956   // Got utf8 string, set stream position forward
2957   cfs->skip_u1(length, CHECK);
2958 }
2959 
2960 
2961 // Inner classes can be static, private or protected (classic VM does this)
2962 #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \
2963                                            JVM_ACC_PRIVATE |                \
2964                                            JVM_ACC_PROTECTED |              \
2965                                            JVM_ACC_STATIC                   \
2966                                          )
2967 
2968 // Find index of the InnerClasses entry for the specified inner_class_info_index.
2969 // Return -1 if none is found.
2970 static int inner_classes_find_index(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2971   Symbol* cp_klass_name =  cp->klass_name_at(inner);
2972   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
2973     int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2974     if (cp->klass_name_at(idx_inner) == cp_klass_name) {
2975       return idx;
2976     }
2977   }
2978   return -1;
2979 }
2980 
2981 // Return the outer_class_info_index for the InnerClasses entry containing the
2982 // specified inner_class_info_index.  Return -1 if no InnerClasses entry is found.
2983 static int inner_classes_jump_to_outer(const Array<u2>* inner_classes, int inner, const ConstantPool* cp, int length) {
2984   if (inner == 0) return -1;
2985   int idx = inner_classes_find_index(inner_classes, inner, cp, length);
2986   if (idx == -1) return -1;
2987   int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2988   return result;
2989 }
2990 
2991 // Return true if circularity is found, false if no circularity is found.
2992 // Use Floyd's cycle finding algorithm.
2993 static bool inner_classes_check_loop_through_outer(const Array<u2>* inner_classes, int idx, const ConstantPool* cp, int length) {
2994   int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset);
2995   int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset);
2996 
2997   while (fast != -1 && fast != 0) {
2998     if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) {
2999       return true;  // found a circularity
3000     }
3001     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3002     if (fast == -1) return false;
3003     fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length);
3004     if (fast == -1) return false;
3005     slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length);
3006     assert(slow != -1, "sanity check");
3007   }
3008   return false;
3009 }
3010 
3011 // Loop through each InnerClasses entry checking for circularities and duplications
3012 // with other entries.  If duplicate entries are found then throw CFE.  Otherwise,
3013 // return true if a circularity or entries with duplicate inner_class_info_indexes
3014 // are found.
3015 bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) {
3016   // Loop through each InnerClasses entry.
3017   for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) {
3018     // Return true if there are circular entries.
3019     if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) {
3020       return true;
3021     }
3022     // Check if there are duplicate entries or entries with the same inner_class_info_index.
3023     for (int y = idx + InstanceKlass::inner_class_next_offset; y < length;
3024          y += InstanceKlass::inner_class_next_offset) {
3025 
3026       // 4347400: make sure there's no duplicate entry in the classes array
3027       if (_major_version >= JAVA_1_5_VERSION) {
3028         guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) ||
3029                             _inner_classes->at(idx+1) != _inner_classes->at(y+1) ||
3030                             _inner_classes->at(idx+2) != _inner_classes->at(y+2) ||
3031                             _inner_classes->at(idx+3) != _inner_classes->at(y+3)),
3032                            "Duplicate entry in InnerClasses attribute in class file %s",
3033                            CHECK_(true));
3034       }
3035       // Return true if there are two entries with the same inner_class_info_index.
3036       if (_inner_classes->at(y) == _inner_classes->at(idx)) {
3037         return true;
3038       }
3039     }
3040   }
3041   return false;
3042 }
3043 
3044 // Return number of classes in the inner classes attribute table
3045 u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs,
3046                                                             const ConstantPool* cp,
3047                                                             const u1* const inner_classes_attribute_start,
3048                                                             bool parsed_enclosingmethod_attribute,
3049                                                             u2 enclosing_method_class_index,
3050                                                             u2 enclosing_method_method_index,
3051                                                             TRAPS) {
3052   const u1* const current_mark = cfs->current();
3053   u2 length = 0;
3054   if (inner_classes_attribute_start != nullptr) {
3055     cfs->set_current(inner_classes_attribute_start);
3056     cfs->guarantee_more(2, CHECK_0);  // length
3057     length = cfs->get_u2_fast();
3058   }
3059 
3060   // 4-tuples of shorts of inner classes data and 2 shorts of enclosing
3061   // method data:
3062   //   [inner_class_info_index,
3063   //    outer_class_info_index,
3064   //    inner_name_index,
3065   //    inner_class_access_flags,
3066   //    ...
3067   //    enclosing_method_class_index,
3068   //    enclosing_method_method_index]
3069   const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0);
3070   Array<u2>* inner_classes = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3071   _inner_classes = inner_classes;
3072 
3073   int index = 0;
3074   cfs->guarantee_more(8 * length, CHECK_0);  // 4-tuples of u2
3075   for (int n = 0; n < length; n++) {
3076     // Inner class index
3077     const u2 inner_class_info_index = cfs->get_u2_fast();
3078     guarantee_property(
3079       valid_klass_reference_at(inner_class_info_index),
3080       "inner_class_info_index %u has bad constant type in class file %s",
3081       inner_class_info_index, CHECK_0);
3082     // Outer class index
3083     const u2 outer_class_info_index = cfs->get_u2_fast();
3084     guarantee_property(
3085       outer_class_info_index == 0 ||
3086         valid_klass_reference_at(outer_class_info_index),
3087       "outer_class_info_index %u has bad constant type in class file %s",
3088       outer_class_info_index, CHECK_0);
3089 
3090     if (outer_class_info_index != 0) {
3091       const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index);
3092       char* bytes = (char*)outer_class_name->bytes();
3093       guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY,
3094                          "Outer class is an array class in class file %s", CHECK_0);
3095     }
3096     // Inner class name
3097     const u2 inner_name_index = cfs->get_u2_fast();
3098     guarantee_property(
3099       inner_name_index == 0 || valid_symbol_at(inner_name_index),
3100       "inner_name_index %u has bad constant type in class file %s",
3101       inner_name_index, CHECK_0);
3102     if (_need_verify) {
3103       guarantee_property(inner_class_info_index != outer_class_info_index,
3104                          "Class is both outer and inner class in class file %s", CHECK_0);
3105     }
3106 
3107     // Access flags
3108     u2 flags;
3109     // JVM_ACC_MODULE is defined in JDK-9 and later.
3110     if (_major_version >= JAVA_9_VERSION) {
3111       flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE);
3112     } else {
3113       flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS;
3114     }
3115 
3116     if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
3117       // Set abstract bit for old class files for backward compatibility
3118       flags |= JVM_ACC_ABSTRACT;
3119     }
3120 
3121     if (!supports_inline_types()) {
3122       const bool is_module = (flags & JVM_ACC_MODULE) != 0;
3123       const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
3124       if (!is_module && !is_interface) {
3125         flags |= JVM_ACC_IDENTITY;
3126       }
3127     }
3128 
3129     Symbol* inner_name_symbol = inner_name_index == 0 ? nullptr : cp->symbol_at(inner_name_index);
3130     verify_legal_class_modifiers(flags, inner_name_symbol, inner_name_index == 0, CHECK_0);
3131     AccessFlags inner_access_flags(flags);
3132 
3133     inner_classes->at_put(index++, inner_class_info_index);
3134     inner_classes->at_put(index++, outer_class_info_index);
3135     inner_classes->at_put(index++, inner_name_index);
3136     inner_classes->at_put(index++, inner_access_flags.as_unsigned_short());
3137   }
3138 
3139   // Check for circular and duplicate entries.
3140   bool has_circularity = false;
3141   if (_need_verify) {
3142     has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0);
3143     if (has_circularity) {
3144       // If circularity check failed then ignore InnerClasses attribute.
3145       MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
3146       index = 0;
3147       if (parsed_enclosingmethod_attribute) {
3148         inner_classes = MetadataFactory::new_array<u2>(_loader_data, 2, CHECK_0);
3149         _inner_classes = inner_classes;
3150       } else {
3151         _inner_classes = Universe::the_empty_short_array();
3152       }
3153     }
3154   }
3155   // Set EnclosingMethod class and method indexes.
3156   if (parsed_enclosingmethod_attribute) {
3157     inner_classes->at_put(index++, enclosing_method_class_index);
3158     inner_classes->at_put(index++, enclosing_method_method_index);
3159   }
3160   assert(index == size || has_circularity, "wrong size");
3161 
3162   // Restore buffer's current position.
3163   cfs->set_current(current_mark);
3164 
3165   return length;
3166 }
3167 
3168 u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs,
3169                                                            const u1* const nest_members_attribute_start,
3170                                                            TRAPS) {
3171   const u1* const current_mark = cfs->current();
3172   u2 length = 0;
3173   if (nest_members_attribute_start != nullptr) {
3174     cfs->set_current(nest_members_attribute_start);
3175     cfs->guarantee_more(2, CHECK_0);  // length
3176     length = cfs->get_u2_fast();
3177   }
3178   const int size = length;
3179   Array<u2>* const nest_members = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3180   _nest_members = nest_members;
3181 
3182   int index = 0;
3183   cfs->guarantee_more(2 * length, CHECK_0);
3184   for (int n = 0; n < length; n++) {
3185     const u2 class_info_index = cfs->get_u2_fast();
3186     guarantee_property(
3187       valid_klass_reference_at(class_info_index),
3188       "Nest member class_info_index %u has bad constant type in class file %s",
3189       class_info_index, CHECK_0);
3190     nest_members->at_put(index++, class_info_index);
3191   }
3192   assert(index == size, "wrong size");
3193 
3194   // Restore buffer's current position.
3195   cfs->set_current(current_mark);
3196 
3197   return length;
3198 }
3199 
3200 u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs,
3201                                                                    const u1* const permitted_subclasses_attribute_start,
3202                                                                    TRAPS) {
3203   const u1* const current_mark = cfs->current();
3204   u2 length = 0;
3205   if (permitted_subclasses_attribute_start != nullptr) {
3206     cfs->set_current(permitted_subclasses_attribute_start);
3207     cfs->guarantee_more(2, CHECK_0);  // length
3208     length = cfs->get_u2_fast();
3209   }
3210   const int size = length;
3211   Array<u2>* const permitted_subclasses = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3212   _permitted_subclasses = permitted_subclasses;
3213 
3214   if (length > 0) {
3215     int index = 0;
3216     cfs->guarantee_more(2 * length, CHECK_0);
3217     for (int n = 0; n < length; n++) {
3218       const u2 class_info_index = cfs->get_u2_fast();
3219       guarantee_property(
3220         valid_klass_reference_at(class_info_index),
3221         "Permitted subclass class_info_index %u has bad constant type in class file %s",
3222         class_info_index, CHECK_0);
3223       permitted_subclasses->at_put(index++, class_info_index);
3224     }
3225     assert(index == size, "wrong size");
3226   }
3227 
3228   // Restore buffer's current position.
3229   cfs->set_current(current_mark);
3230 
3231   return length;
3232 }
3233 
3234 u2 ClassFileParser::parse_classfile_loadable_descriptors_attribute(const ClassFileStream* const cfs,
3235                                                                    const u1* const loadable_descriptors_attribute_start,
3236                                                                    TRAPS) {
3237   const u1* const current_mark = cfs->current();
3238   u2 length = 0;
3239   if (loadable_descriptors_attribute_start != nullptr) {
3240     cfs->set_current(loadable_descriptors_attribute_start);
3241     cfs->guarantee_more(2, CHECK_0);  // length
3242     length = cfs->get_u2_fast();
3243   }
3244   const int size = length;
3245   Array<u2>* const loadable_descriptors = MetadataFactory::new_array<u2>(_loader_data, size, CHECK_0);
3246   _loadable_descriptors = loadable_descriptors;
3247   if (length > 0) {
3248     int index = 0;
3249     cfs->guarantee_more(2 * length, CHECK_0);
3250     for (int n = 0; n < length; n++) {
3251       const u2 descriptor_index = cfs->get_u2_fast();
3252       guarantee_property(
3253         valid_symbol_at(descriptor_index),
3254         "LoadableDescriptors descriptor_index %u has bad constant type in class file %s",
3255         descriptor_index, CHECK_0);
3256       Symbol* descriptor = _cp->symbol_at(descriptor_index);
3257       bool valid = legal_field_signature(descriptor, CHECK_0);
3258       if(!valid) {
3259         ResourceMark rm(THREAD);
3260         Exceptions::fthrow(THREAD_AND_LOCATION,
3261           vmSymbols::java_lang_ClassFormatError(),
3262           "Descriptor from LoadableDescriptors attribute at index \"%d\" in class %s has illegal signature \"%s\"",
3263           descriptor_index, _class_name->as_C_string(), descriptor->as_C_string());
3264         return 0;
3265       }
3266       loadable_descriptors->at_put(index++, descriptor_index);
3267     }
3268     assert(index == size, "wrong size");
3269   }
3270 
3271   // Restore buffer's current position.
3272   cfs->set_current(current_mark);
3273 
3274   return length;
3275 }
3276 
3277 //  Record {
3278 //    u2 attribute_name_index;
3279 //    u4 attribute_length;
3280 //    u2 components_count;
3281 //    component_info components[components_count];
3282 //  }
3283 //  component_info {
3284 //    u2 name_index;
3285 //    u2 descriptor_index
3286 //    u2 attributes_count;
3287 //    attribute_info_attributes[attributes_count];
3288 //  }
3289 u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs,
3290                                                      const ConstantPool* cp,
3291                                                      const u1* const record_attribute_start,
3292                                                      TRAPS) {
3293   const u1* const current_mark = cfs->current();
3294   int components_count = 0;
3295   unsigned int calculate_attr_size = 0;
3296   if (record_attribute_start != nullptr) {
3297     cfs->set_current(record_attribute_start);
3298     cfs->guarantee_more(2, CHECK_0);  // num of components
3299     components_count = (int)cfs->get_u2_fast();
3300     calculate_attr_size = 2;
3301   }
3302 
3303   Array<RecordComponent*>* const record_components =
3304     MetadataFactory::new_array<RecordComponent*>(_loader_data, components_count, nullptr, CHECK_0);
3305   _record_components = record_components;
3306 
3307   for (int x = 0; x < components_count; x++) {
3308     cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count
3309 
3310     const u2 name_index = cfs->get_u2_fast();
3311     guarantee_property(valid_symbol_at(name_index),
3312       "Invalid constant pool index %u for name in Record attribute in class file %s",
3313       name_index, CHECK_0);
3314     const Symbol* const name = cp->symbol_at(name_index);
3315     verify_legal_field_name(name, CHECK_0);
3316 
3317     const u2 descriptor_index = cfs->get_u2_fast();
3318     guarantee_property(valid_symbol_at(descriptor_index),
3319       "Invalid constant pool index %u for descriptor in Record attribute in class file %s",
3320       descriptor_index, CHECK_0);
3321     const Symbol* const descr = cp->symbol_at(descriptor_index);
3322     verify_legal_field_signature(name, descr, CHECK_0);
3323 
3324     const u2 attributes_count = cfs->get_u2_fast();
3325     calculate_attr_size += 6;
3326     u2 generic_sig_index = 0;
3327     const u1* runtime_visible_annotations = nullptr;
3328     int runtime_visible_annotations_length = 0;
3329     bool runtime_invisible_annotations_exists = false;
3330     const u1* runtime_visible_type_annotations = nullptr;
3331     int runtime_visible_type_annotations_length = 0;
3332     bool runtime_invisible_type_annotations_exists = false;
3333 
3334     // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations,
3335     // and Runtime(In)VisibleTypeAnnotations.  Other attributes are ignored.
3336     for (int y = 0; y < attributes_count; y++) {
3337       cfs->guarantee_more(6, CHECK_0);  // attribute_name_index, attribute_length
3338       const u2 attribute_name_index = cfs->get_u2_fast();
3339       const u4 attribute_length = cfs->get_u4_fast();
3340       calculate_attr_size += 6;
3341       guarantee_property(
3342         valid_symbol_at(attribute_name_index),
3343         "Invalid Record attribute name index %u in class file %s",
3344         attribute_name_index, CHECK_0);
3345 
3346       const Symbol* const attribute_name = cp->symbol_at(attribute_name_index);
3347       if (attribute_name == vmSymbols::tag_signature()) {
3348         if (generic_sig_index != 0) {
3349           classfile_parse_error(
3350             "Multiple Signature attributes for Record component in class file %s",
3351             THREAD);
3352           return 0;
3353         }
3354         if (attribute_length != 2) {
3355           classfile_parse_error(
3356             "Invalid Signature attribute length %u in Record component in class file %s",
3357             attribute_length, THREAD);
3358           return 0;
3359         }
3360         generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0);
3361 
3362       } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) {
3363         if (runtime_visible_annotations != nullptr) {
3364           classfile_parse_error(
3365             "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD);
3366           return 0;
3367         }
3368         runtime_visible_annotations_length = attribute_length;
3369         runtime_visible_annotations = cfs->current();
3370 
3371         assert(runtime_visible_annotations != nullptr, "null record component visible annotation");
3372         cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0);
3373         cfs->skip_u1_fast(runtime_visible_annotations_length);
3374 
3375       } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) {
3376         if (runtime_invisible_annotations_exists) {
3377           classfile_parse_error(
3378             "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD);
3379           return 0;
3380         }
3381         runtime_invisible_annotations_exists = true;
3382         cfs->skip_u1(attribute_length, CHECK_0);
3383 
3384       } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) {
3385         if (runtime_visible_type_annotations != nullptr) {
3386           classfile_parse_error(
3387             "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3388           return 0;
3389         }
3390         runtime_visible_type_annotations_length = attribute_length;
3391         runtime_visible_type_annotations = cfs->current();
3392 
3393         assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation");
3394         cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0);
3395         cfs->skip_u1_fast(runtime_visible_type_annotations_length);
3396 
3397       } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) {
3398         if (runtime_invisible_type_annotations_exists) {
3399           classfile_parse_error(
3400             "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD);
3401           return 0;
3402         }
3403         runtime_invisible_type_annotations_exists = true;
3404         cfs->skip_u1(attribute_length, CHECK_0);
3405 
3406       } else {
3407         // Skip unknown attributes
3408         cfs->skip_u1(attribute_length, CHECK_0);
3409       }
3410       calculate_attr_size += attribute_length;
3411     } // End of attributes For loop
3412 
3413     AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations,
3414                                                         runtime_visible_annotations_length,
3415                                                         CHECK_0);
3416     AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations,
3417                                                              runtime_visible_type_annotations_length,
3418                                                              CHECK_0);
3419 
3420     RecordComponent* record_component =
3421       RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index,
3422                                 annotations, type_annotations, CHECK_0);
3423     record_components->at_put(x, record_component);
3424   }  // End of component processing loop
3425 
3426   // Restore buffer's current position.
3427   cfs->set_current(current_mark);
3428   return calculate_attr_size;
3429 }
3430 
3431 void ClassFileParser::parse_classfile_synthetic_attribute() {
3432   set_class_synthetic_flag(true);
3433 }
3434 
3435 void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) {
3436   assert(cfs != nullptr, "invariant");
3437 
3438   const u2 signature_index = cfs->get_u2(CHECK);
3439   guarantee_property(
3440     valid_symbol_at(signature_index),
3441     "Invalid constant pool index %u in Signature attribute in class file %s",
3442     signature_index, CHECK);
3443   set_class_generic_signature_index(signature_index);
3444 }
3445 
3446 void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs,
3447                                                                   ConstantPool* cp,
3448                                                                   u4 attribute_byte_length,
3449                                                                   TRAPS) {
3450   assert(cfs != nullptr, "invariant");
3451   assert(cp != nullptr, "invariant");
3452   const int cp_size = cp->length();
3453 
3454   const u1* const current_before_parsing = cfs->current();
3455 
3456   guarantee_property(attribute_byte_length >= sizeof(u2),
3457                      "Invalid BootstrapMethods attribute length %u in class file %s",
3458                      attribute_byte_length,
3459                      CHECK);
3460 
3461   cfs->guarantee_more(attribute_byte_length, CHECK);
3462 
3463   const int num_bootstrap_methods = cfs->get_u2_fast();
3464 
3465   guarantee_property(_max_bootstrap_specifier_index < num_bootstrap_methods,
3466                      "Short length on BootstrapMethods in class file %s",
3467                      CHECK);
3468 
3469   const u4 bootstrap_methods_u2_len = (attribute_byte_length - sizeof(u2)) / sizeof(u2);
3470 
3471   // Eagerly assign the arrays so that they will be deallocated with the constant
3472   // pool if there is an error.
3473   BSMAttributeEntries::InsertionIterator iter =
3474     cp->bsm_entries().start_extension(num_bootstrap_methods,
3475                                       bootstrap_methods_u2_len,
3476                                       _loader_data,
3477                                       CHECK);
3478 
3479   for (int i = 0; i < num_bootstrap_methods; i++) {
3480     cfs->guarantee_more(sizeof(u2) * 2, CHECK);  // bsm, argc
3481     u2 bootstrap_method_ref = cfs->get_u2_fast();
3482     u2 num_bootstrap_arguments = cfs->get_u2_fast();
3483     guarantee_property(
3484        valid_cp_range(bootstrap_method_ref, cp_size) &&
3485        cp->tag_at(bootstrap_method_ref).is_method_handle(),
3486        "bootstrap_method_index %u has bad constant type in class file %s",
3487        bootstrap_method_ref,
3488        CHECK);
3489     cfs->guarantee_more(sizeof(u2) * num_bootstrap_arguments, CHECK); // argv[argc]
3490 
3491     BSMAttributeEntry* entry = iter.reserve_new_entry(bootstrap_method_ref, num_bootstrap_arguments);
3492     guarantee_property(entry != nullptr,
3493                        "Invalid BootstrapMethods num_bootstrap_methods."
3494                        " The total amount of space reserved for the BootstrapMethod attribute was not sufficient", CHECK);
3495 
3496     for (int argi = 0; argi < num_bootstrap_arguments; argi++) {
3497       const u2 argument_index = cfs->get_u2_fast();
3498       guarantee_property(
3499         valid_cp_range(argument_index, cp_size) &&
3500         cp->tag_at(argument_index).is_loadable_constant(),
3501         "argument_index %u has bad constant type in class file %s",
3502         argument_index,
3503         CHECK);
3504       entry->set_argument(argi, argument_index);
3505     }
3506   }
3507   cp->bsm_entries().end_extension(iter, _loader_data, CHECK);
3508   guarantee_property(current_before_parsing + attribute_byte_length == cfs->current(),
3509                      "Bad length on BootstrapMethods in class file %s",
3510                      CHECK);
3511 }
3512 
3513 void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs,
3514                                                  ConstantPool* cp,
3515                  ClassFileParser::ClassAnnotationCollector* parsed_annotations,
3516                                                  TRAPS) {
3517   assert(cfs != nullptr, "invariant");
3518   assert(cp != nullptr, "invariant");
3519   assert(parsed_annotations != nullptr, "invariant");
3520 
3521   // Set inner classes attribute to default sentinel
3522   _inner_classes = Universe::the_empty_short_array();
3523   // Set nest members attribute to default sentinel
3524   _nest_members = Universe::the_empty_short_array();
3525   // Set _permitted_subclasses attribute to default sentinel
3526   _permitted_subclasses = Universe::the_empty_short_array();
3527   // Set _loadable_descriptors attribute to default sentinel
3528   _loadable_descriptors = Universe::the_empty_short_array();
3529   cfs->guarantee_more(2, CHECK);  // attributes_count
3530   u2 attributes_count = cfs->get_u2_fast();
3531   bool parsed_sourcefile_attribute = false;
3532   bool parsed_innerclasses_attribute = false;
3533   bool parsed_nest_members_attribute = false;
3534   bool parsed_permitted_subclasses_attribute = false;
3535   bool parsed_loadable_descriptors_attribute = false;
3536   bool parsed_nest_host_attribute = false;
3537   bool parsed_record_attribute = false;
3538   bool parsed_enclosingmethod_attribute = false;
3539   bool parsed_bootstrap_methods_attribute = false;
3540   const u1* runtime_visible_annotations = nullptr;
3541   int runtime_visible_annotations_length = 0;
3542   const u1* runtime_visible_type_annotations = nullptr;
3543   int runtime_visible_type_annotations_length = 0;
3544   bool runtime_invisible_type_annotations_exists = false;
3545   bool runtime_invisible_annotations_exists = false;
3546   bool parsed_source_debug_ext_annotations_exist = false;
3547   const u1* inner_classes_attribute_start = nullptr;
3548   u4  inner_classes_attribute_length = 0;
3549   u2  enclosing_method_class_index = 0;
3550   u2  enclosing_method_method_index = 0;
3551   const u1* nest_members_attribute_start = nullptr;
3552   u4  nest_members_attribute_length = 0;
3553   const u1* record_attribute_start = nullptr;
3554   u4  record_attribute_length = 0;
3555   const u1* permitted_subclasses_attribute_start = nullptr;
3556   u4  permitted_subclasses_attribute_length = 0;
3557   const u1* loadable_descriptors_attribute_start = nullptr;
3558   u4  loadable_descriptors_attribute_length = 0;
3559 
3560   // Iterate over attributes
3561   while (attributes_count--) {
3562     cfs->guarantee_more(6, CHECK);  // attribute_name_index, attribute_length
3563     const u2 attribute_name_index = cfs->get_u2_fast();
3564     const u4 attribute_length = cfs->get_u4_fast();
3565     guarantee_property(
3566       valid_symbol_at(attribute_name_index),
3567       "Attribute name has bad constant pool index %u in class file %s",
3568       attribute_name_index, CHECK);
3569     const Symbol* const tag = cp->symbol_at(attribute_name_index);
3570     if (tag == vmSymbols::tag_source_file()) {
3571       // Check for SourceFile tag
3572       if (_need_verify) {
3573         guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK);
3574       }
3575       if (parsed_sourcefile_attribute) {
3576         classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD);
3577         return;
3578       } else {
3579         parsed_sourcefile_attribute = true;
3580       }
3581       parse_classfile_sourcefile_attribute(cfs, CHECK);
3582     } else if (tag == vmSymbols::tag_source_debug_extension()) {
3583       // Check for SourceDebugExtension tag
3584       if (parsed_source_debug_ext_annotations_exist) {
3585         classfile_parse_error(
3586           "Multiple SourceDebugExtension attributes in class file %s", THREAD);
3587         return;
3588       }
3589       parsed_source_debug_ext_annotations_exist = true;
3590       parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK);
3591     } else if (tag == vmSymbols::tag_inner_classes()) {
3592       // Check for InnerClasses tag
3593       if (parsed_innerclasses_attribute) {
3594         classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD);
3595         return;
3596       } else {
3597         parsed_innerclasses_attribute = true;
3598       }
3599       inner_classes_attribute_start = cfs->current();
3600       inner_classes_attribute_length = attribute_length;
3601       cfs->skip_u1(inner_classes_attribute_length, CHECK);
3602     } else if (tag == vmSymbols::tag_synthetic()) {
3603       // Check for Synthetic tag
3604       // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec
3605       if (attribute_length != 0) {
3606         classfile_parse_error(
3607           "Invalid Synthetic classfile attribute length %u in class file %s",
3608           attribute_length, THREAD);
3609         return;
3610       }
3611       parse_classfile_synthetic_attribute();
3612     } else if (tag == vmSymbols::tag_deprecated()) {
3613       // Check for Deprecated tag - 4276120
3614       if (attribute_length != 0) {
3615         classfile_parse_error(
3616           "Invalid Deprecated classfile attribute length %u in class file %s",
3617           attribute_length, THREAD);
3618         return;
3619       }
3620     } else if (_major_version >= JAVA_1_5_VERSION) {
3621       if (tag == vmSymbols::tag_signature()) {
3622         if (_generic_signature_index != 0) {
3623           classfile_parse_error(
3624             "Multiple Signature attributes in class file %s", THREAD);
3625           return;
3626         }
3627         if (attribute_length != 2) {
3628           classfile_parse_error(
3629             "Wrong Signature attribute length %u in class file %s",
3630             attribute_length, THREAD);
3631           return;
3632         }
3633         parse_classfile_signature_attribute(cfs, CHECK);
3634       } else if (tag == vmSymbols::tag_runtime_visible_annotations()) {
3635         if (runtime_visible_annotations != nullptr) {
3636           classfile_parse_error(
3637             "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD);
3638           return;
3639         }
3640         runtime_visible_annotations_length = attribute_length;
3641         runtime_visible_annotations = cfs->current();
3642         assert(runtime_visible_annotations != nullptr, "null visible annotations");
3643         cfs->guarantee_more(runtime_visible_annotations_length, CHECK);
3644         parse_annotations(cp,
3645                           runtime_visible_annotations,
3646                           runtime_visible_annotations_length,
3647                           parsed_annotations,
3648                           _loader_data,
3649                           _can_access_vm_annotations);
3650         cfs->skip_u1_fast(runtime_visible_annotations_length);
3651       } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) {
3652         if (runtime_invisible_annotations_exists) {
3653           classfile_parse_error(
3654             "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD);
3655           return;
3656         }
3657         runtime_invisible_annotations_exists = true;
3658         cfs->skip_u1(attribute_length, CHECK);
3659       } else if (tag == vmSymbols::tag_enclosing_method()) {
3660         if (parsed_enclosingmethod_attribute) {
3661           classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD);
3662           return;
3663         } else {
3664           parsed_enclosingmethod_attribute = true;
3665         }
3666         guarantee_property(attribute_length == 4,
3667           "Wrong EnclosingMethod attribute length %u in class file %s",
3668           attribute_length, CHECK);
3669         cfs->guarantee_more(4, CHECK);  // class_index, method_index
3670         enclosing_method_class_index  = cfs->get_u2_fast();
3671         enclosing_method_method_index = cfs->get_u2_fast();
3672         if (enclosing_method_class_index == 0) {
3673           classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD);
3674           return;
3675         }
3676         // Validate the constant pool indices and types
3677         guarantee_property(valid_klass_reference_at(enclosing_method_class_index),
3678           "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK);
3679         if (enclosing_method_method_index != 0 &&
3680             (!cp->is_within_bounds(enclosing_method_method_index) ||
3681              !cp->tag_at(enclosing_method_method_index).is_name_and_type())) {
3682           classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD);
3683           return;
3684         }
3685       } else if (tag == vmSymbols::tag_bootstrap_methods() &&
3686                  _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) {
3687         if (parsed_bootstrap_methods_attribute) {
3688           classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD);
3689           return;
3690         }
3691         parsed_bootstrap_methods_attribute = true;
3692         parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK);
3693       } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) {
3694         if (runtime_visible_type_annotations != nullptr) {
3695           classfile_parse_error(
3696             "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD);
3697           return;
3698         }
3699         runtime_visible_type_annotations_length = attribute_length;
3700         runtime_visible_type_annotations = cfs->current();
3701         assert(runtime_visible_type_annotations != nullptr, "null visible type annotations");
3702         // No need for the VM to parse Type annotations
3703         cfs->skip_u1(runtime_visible_type_annotations_length, CHECK);
3704       } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) {
3705         if (runtime_invisible_type_annotations_exists) {
3706           classfile_parse_error(
3707             "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD);
3708           return;
3709         }
3710         runtime_invisible_type_annotations_exists = true;
3711         cfs->skip_u1(attribute_length, CHECK);
3712       } else if (_major_version >= JAVA_11_VERSION) {
3713         if (tag == vmSymbols::tag_nest_members()) {
3714           // Check for NestMembers tag
3715           if (parsed_nest_members_attribute) {
3716             classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD);
3717             return;
3718           } else {
3719             parsed_nest_members_attribute = true;
3720           }
3721           if (parsed_nest_host_attribute) {
3722             classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD);
3723             return;
3724           }
3725           nest_members_attribute_start = cfs->current();
3726           nest_members_attribute_length = attribute_length;
3727           cfs->skip_u1(nest_members_attribute_length, CHECK);
3728         } else if (tag == vmSymbols::tag_nest_host()) {
3729           if (parsed_nest_host_attribute) {
3730             classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD);
3731             return;
3732           } else {
3733             parsed_nest_host_attribute = true;
3734           }
3735           if (parsed_nest_members_attribute) {
3736             classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD);
3737             return;
3738           }
3739           if (_need_verify) {
3740             guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK);
3741           }
3742           cfs->guarantee_more(2, CHECK);
3743           u2 class_info_index = cfs->get_u2_fast();
3744           guarantee_property(
3745                          valid_klass_reference_at(class_info_index),
3746                          "Nest-host class_info_index %u has bad constant type in class file %s",
3747                          class_info_index, CHECK);
3748           _nest_host = class_info_index;
3749 
3750         } else if (_major_version >= JAVA_16_VERSION) {
3751           if (tag == vmSymbols::tag_record()) {
3752             if (parsed_record_attribute) {
3753               classfile_parse_error("Multiple Record attributes in class file %s", THREAD);
3754               return;
3755             }
3756             parsed_record_attribute = true;
3757             record_attribute_start = cfs->current();
3758             record_attribute_length = attribute_length;
3759           } else if (_major_version >= JAVA_17_VERSION) {
3760             if (tag == vmSymbols::tag_permitted_subclasses()) {
3761               if (parsed_permitted_subclasses_attribute) {
3762                 classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK);
3763                 return;
3764               }
3765               // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute.
3766               if (_access_flags.is_final()) {
3767                 classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK);
3768                 return;
3769               }
3770               parsed_permitted_subclasses_attribute = true;
3771               permitted_subclasses_attribute_start = cfs->current();
3772               permitted_subclasses_attribute_length = attribute_length;
3773             }
3774             if (Arguments::is_valhalla_enabled() && tag == vmSymbols::tag_loadable_descriptors()) {
3775               if (parsed_loadable_descriptors_attribute) {
3776                 classfile_parse_error("Multiple LoadableDescriptors attributes in class file %s", CHECK);
3777                 return;
3778               }
3779               parsed_loadable_descriptors_attribute = true;
3780               loadable_descriptors_attribute_start = cfs->current();
3781               loadable_descriptors_attribute_length = attribute_length;
3782             }
3783           }
3784           // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION
3785           cfs->skip_u1(attribute_length, CHECK);
3786         } else {
3787           // Unknown attribute
3788           cfs->skip_u1(attribute_length, CHECK);
3789         }
3790       } else {
3791         // Unknown attribute
3792         cfs->skip_u1(attribute_length, CHECK);
3793       }
3794     } else {
3795       // Unknown attribute
3796       cfs->skip_u1(attribute_length, CHECK);
3797     }
3798   }
3799   _class_annotations = allocate_annotations(runtime_visible_annotations,
3800                                             runtime_visible_annotations_length,
3801                                             CHECK);
3802   _class_type_annotations = allocate_annotations(runtime_visible_type_annotations,
3803                                                  runtime_visible_type_annotations_length,
3804                                                  CHECK);
3805 
3806   if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) {
3807     const u2 num_of_classes = parse_classfile_inner_classes_attribute(
3808                             cfs,
3809                             cp,
3810                             inner_classes_attribute_start,
3811                             parsed_innerclasses_attribute,
3812                             enclosing_method_class_index,
3813                             enclosing_method_method_index,
3814                             CHECK);
3815     if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) {
3816       guarantee_property(
3817         inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes,
3818         "Wrong InnerClasses attribute length in class file %s", CHECK);
3819     }
3820   }
3821 
3822   if (parsed_nest_members_attribute) {
3823     const u2 num_of_classes = parse_classfile_nest_members_attribute(
3824                             cfs,
3825                             nest_members_attribute_start,
3826                             CHECK);
3827     if (_need_verify) {
3828       guarantee_property(
3829         nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes,
3830         "Wrong NestMembers attribute length in class file %s", CHECK);
3831     }
3832   }
3833 
3834   if (parsed_record_attribute) {
3835     const unsigned int calculated_attr_length = parse_classfile_record_attribute(
3836                             cfs,
3837                             cp,
3838                             record_attribute_start,
3839                             CHECK);
3840     if (_need_verify) {
3841       guarantee_property(record_attribute_length == calculated_attr_length,
3842                          "Record attribute has wrong length in class file %s",
3843                          CHECK);
3844     }
3845   }
3846 
3847   if (parsed_permitted_subclasses_attribute) {
3848     const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute(
3849                             cfs,
3850                             permitted_subclasses_attribute_start,
3851                             CHECK);
3852     if (_need_verify) {
3853       guarantee_property(
3854         permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses,
3855         "Wrong PermittedSubclasses attribute length in class file %s", CHECK);
3856     }
3857   }
3858 
3859   if (parsed_loadable_descriptors_attribute) {
3860     const u2 num_classes = parse_classfile_loadable_descriptors_attribute(
3861                             cfs,
3862                             loadable_descriptors_attribute_start,
3863                             CHECK);
3864     if (_need_verify) {
3865       guarantee_property(
3866         loadable_descriptors_attribute_length == sizeof(num_classes) + sizeof(u2) * num_classes,
3867         "Wrong LoadableDescriptors attribute length in class file %s", CHECK);
3868     }
3869   }
3870 
3871   if (_max_bootstrap_specifier_index >= 0) {
3872     guarantee_property(parsed_bootstrap_methods_attribute,
3873                        "Missing BootstrapMethods attribute in class file %s", CHECK);
3874   }
3875 }
3876 
3877 void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) {
3878   assert(k != nullptr, "invariant");
3879 
3880   if (_synthetic_flag)
3881     k->set_is_synthetic();
3882   if (_sourcefile_index != 0) {
3883     k->set_source_file_name_index(_sourcefile_index);
3884   }
3885   if (_generic_signature_index != 0) {
3886     k->set_generic_signature_index(_generic_signature_index);
3887   }
3888   if (_sde_buffer != nullptr) {
3889     k->set_source_debug_extension(_sde_buffer, _sde_length);
3890   }
3891 }
3892 
3893 // Create the Annotations object that will
3894 // hold the annotations array for the Klass.
3895 void ClassFileParser::create_combined_annotations(TRAPS) {
3896     if (_class_annotations == nullptr &&
3897         _class_type_annotations == nullptr &&
3898         _fields_annotations == nullptr &&
3899         _fields_type_annotations == nullptr) {
3900       // Don't create the Annotations object unnecessarily.
3901       return;
3902     }
3903 
3904     Annotations* const annotations = Annotations::allocate(_loader_data, CHECK);
3905     annotations->set_class_annotations(_class_annotations);
3906     annotations->set_class_type_annotations(_class_type_annotations);
3907     annotations->set_fields_annotations(_fields_annotations);
3908     annotations->set_fields_type_annotations(_fields_type_annotations);
3909 
3910     // This is the Annotations object that will be
3911     // assigned to InstanceKlass being constructed.
3912     _combined_annotations = annotations;
3913 
3914     // The annotations arrays below has been transferred the
3915     // _combined_annotations so these fields can now be cleared.
3916     _class_annotations       = nullptr;
3917     _class_type_annotations  = nullptr;
3918     _fields_annotations      = nullptr;
3919     _fields_type_annotations = nullptr;
3920 }
3921 
3922 // Transfer ownership of metadata allocated to the InstanceKlass.
3923 void ClassFileParser::apply_parsed_class_metadata(
3924                                             InstanceKlass* this_klass,
3925                                             int java_fields_count) {
3926   assert(this_klass != nullptr, "invariant");
3927 
3928   _cp->set_pool_holder(this_klass);
3929   this_klass->set_constants(_cp);
3930   this_klass->set_fieldinfo_stream(_fieldinfo_stream);
3931   this_klass->set_fieldinfo_search_table(_fieldinfo_search_table);
3932   this_klass->set_fields_status(_fields_status);
3933   this_klass->set_methods(_methods);
3934   this_klass->set_inner_classes(_inner_classes);
3935   this_klass->set_nest_members(_nest_members);
3936   this_klass->set_nest_host_index(_nest_host);
3937   this_klass->set_loadable_descriptors(_loadable_descriptors);
3938   this_klass->set_annotations(_combined_annotations);
3939   this_klass->set_permitted_subclasses(_permitted_subclasses);
3940   this_klass->set_record_components(_record_components);
3941   this_klass->set_inline_layout_info_array(_inline_layout_info_array);
3942 
3943   DEBUG_ONLY(FieldInfoStream::validate_search_table(_cp, _fieldinfo_stream, _fieldinfo_search_table));
3944 
3945   // Delay the setting of _local_interfaces and _transitive_interfaces until after
3946   // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could
3947   // be shared with _transitive_interfaces and _transitive_interfaces may be shared with
3948   // its _super. If an OOM occurs while loading the current klass, its _super field
3949   // may not have been set. When GC tries to free the klass, the _transitive_interfaces
3950   // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent
3951   // dereferences to the deallocated _transitive_interfaces will result in a crash.
3952 
3953   // Clear out these fields so they don't get deallocated by the destructor
3954   clear_class_metadata();
3955 }
3956 
3957 AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno,
3958                                                        int anno_length,
3959                                                        TRAPS) {
3960   AnnotationArray* annotations = nullptr;
3961   if (anno != nullptr) {
3962     annotations = MetadataFactory::new_array<u1>(_loader_data,
3963                                                  anno_length,
3964                                                  CHECK_(annotations));
3965     for (int i = 0; i < anno_length; i++) {
3966       annotations->at_put(i, anno[i]);
3967     }
3968   }
3969   return annotations;
3970 }
3971 
3972 void ClassFileParser::check_super_class(ConstantPool* const cp,
3973                                         const int super_class_index,
3974                                         const bool need_verify,
3975                                         TRAPS) {
3976   assert(cp != nullptr, "invariant");
3977 
3978   if (super_class_index == 0) {
3979     guarantee_property(_class_name == vmSymbols::java_lang_Object(),
3980                        "Invalid superclass index 0 in class file %s",

3981                        CHECK);
3982   } else {
3983     guarantee_property(valid_klass_reference_at(super_class_index),
3984                        "Invalid superclass index %u in class file %s",
3985                        super_class_index,
3986                        CHECK);
3987 
3988     // The class name should be legal because it is checked when parsing constant pool.
3989     // However, make sure it is not an array type.
3990     if (need_verify) {
3991       guarantee_property(cp->klass_name_at(super_class_index)->char_at(0) != JVM_SIGNATURE_ARRAY,
3992                         "Bad superclass name in class file %s", CHECK);
3993     }
3994   }
3995 }
3996 
3997 OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) {
3998   _max_nonstatic_oop_maps = max_blocks;
3999   _nonstatic_oop_map_count = 0;
4000   if (max_blocks == 0) {
4001     _nonstatic_oop_maps = nullptr;
4002   } else {
4003     _nonstatic_oop_maps =
4004         NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps);
4005     memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks);
4006   }
4007 }
4008 
4009 OopMapBlock* OopMapBlocksBuilder::last_oop_map() const {
4010   assert(_nonstatic_oop_map_count > 0, "Has no oop maps");
4011   return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1);
4012 }
4013 
4014 // addition of super oop maps
4015 void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) {
4016   assert(nof_blocks && _nonstatic_oop_map_count == 0 &&
4017          nof_blocks <= _max_nonstatic_oop_maps, "invariant");
4018 
4019   memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks);
4020   _nonstatic_oop_map_count += nof_blocks;
4021 }
4022 
4023 // collection of oops
4024 void OopMapBlocksBuilder::add(int offset, int count) {
4025   if (_nonstatic_oop_map_count == 0) {
4026     _nonstatic_oop_map_count++;
4027   }
4028   OopMapBlock* nonstatic_oop_map = last_oop_map();
4029   if (nonstatic_oop_map->count() == 0) {  // Unused map, set it up
4030     nonstatic_oop_map->set_offset(offset);
4031     nonstatic_oop_map->set_count(count);
4032   } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add
4033     nonstatic_oop_map->increment_count(count);
4034   } else { // Need a new one...
4035     _nonstatic_oop_map_count++;
4036     assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check");
4037     nonstatic_oop_map = last_oop_map();
4038     nonstatic_oop_map->set_offset(offset);
4039     nonstatic_oop_map->set_count(count);
4040   }
4041 }
4042 
4043 // general purpose copy, e.g. into allocated instanceKlass
4044 void OopMapBlocksBuilder::copy(OopMapBlock* dst) {
4045   if (_nonstatic_oop_map_count != 0) {
4046     memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count);
4047   }
4048 }
4049 
4050 // Sort and compact adjacent blocks
4051 void OopMapBlocksBuilder::compact() {
4052   if (_nonstatic_oop_map_count <= 1) {
4053     return;
4054   }
4055   /*
4056    * Since field layout sneaks in oops before values, we will be able to condense
4057    * blocks. There is potential to compact between super, own refs and values
4058    * containing refs.
4059    *
4060    * Currently compaction is slightly limited due to values being 8 byte aligned.
4061    * This may well change: FixMe if it doesn't, the code below is fairly general purpose
4062    * and maybe it doesn't need to be.
4063    */
4064   qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock),
4065         (_sort_Fn)OopMapBlock::compare_offset);
4066   if (_nonstatic_oop_map_count < 2) {
4067     return;
4068   }
4069 
4070   // Make a temp copy, and iterate through and copy back into the original
4071   ResourceMark rm;
4072   OopMapBlock* oop_maps_copy =
4073       NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count);
4074   OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count;
4075   copy(oop_maps_copy);
4076   OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps;
4077   unsigned int new_count = 1;
4078   oop_maps_copy++;
4079   while(oop_maps_copy < oop_maps_copy_end) {
4080     assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant");
4081     if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) {
4082       nonstatic_oop_map->increment_count(oop_maps_copy->count());
4083     } else {
4084       nonstatic_oop_map++;
4085       new_count++;
4086       nonstatic_oop_map->set_offset(oop_maps_copy->offset());
4087       nonstatic_oop_map->set_count(oop_maps_copy->count());
4088     }
4089     oop_maps_copy++;
4090   }
4091   assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?");
4092   _nonstatic_oop_map_count = new_count;
4093 }
4094 
4095 void OopMapBlocksBuilder::print_on(outputStream* st) const {
4096   st->print_cr("  OopMapBlocks: %3d  /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps);
4097   if (_nonstatic_oop_map_count > 0) {
4098     OopMapBlock* map = _nonstatic_oop_maps;
4099     OopMapBlock* last_map = last_oop_map();
4100     assert(map <= last_map, "Last less than first");
4101     while (map <= last_map) {
4102       st->print_cr("    Offset: %3d  -%3d Count: %3d", map->offset(),
4103                    map->offset() + map->offset_span() - heapOopSize, map->count());
4104       map++;
4105     }
4106   }
4107 }
4108 
4109 void OopMapBlocksBuilder::print_value_on(outputStream* st) const {
4110   print_on(st);
4111 }
4112 
4113 void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) {
4114   assert(ik != nullptr, "invariant");
4115 
4116   const InstanceKlass* const super = ik->super();
4117 
4118   // Check if this klass has an empty finalize method (i.e. one with return bytecode only),
4119   // in which case we don't have to register objects as finalizable
4120   if (!_has_empty_finalizer) {
4121     if (_has_finalizer ||
4122         (super != nullptr && super->has_finalizer())) {
4123       ik->set_has_finalizer();
4124     }
4125   }
4126 
4127 #ifdef ASSERT
4128   bool f = false;
4129   const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(),
4130                                            vmSymbols::void_method_signature());
4131   if (InstanceKlass::is_finalization_enabled() &&
4132       (m != nullptr) && !m->is_empty_method()) {
4133       f = true;
4134   }
4135 
4136   // Spec doesn't prevent agent from redefinition of empty finalizer.
4137   // Despite the fact that it's generally bad idea and redefined finalizer
4138   // will not work as expected we shouldn't abort vm in this case
4139   if (!ik->has_redefined_this_or_super()) {
4140     assert(ik->has_finalizer() == f, "inconsistent has_finalizer");
4141   }
4142 #endif
4143 
4144   // Check if this klass supports the java.lang.Cloneable interface
4145   if (vmClasses::Cloneable_klass_is_loaded()) {
4146     if (ik->is_subtype_of(vmClasses::Cloneable_klass())) {
4147       ik->set_is_cloneable();
4148     }
4149   }
4150 
4151   // If it cannot be fast-path allocated, set a bit in the layout helper.
4152   // See documentation of InstanceKlass::can_be_fastpath_allocated().
4153   assert(ik->size_helper() > 0, "layout_helper is initialized");
4154   if (ik->is_abstract() || ik->is_interface()
4155       || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr)
4156       || ik->size_helper() >= FastAllocateSizeLimit) {
4157     // Forbid fast-path allocation.
4158     const jint lh = Klass::instance_layout_helper(ik->size_helper(), true);
4159     ik->set_layout_helper(lh);
4160   }
4161 
4162   // Propagate the AOT runtimeSetup method discovery
4163   if (_has_aot_runtime_setup_method) {
4164     ik->set_is_runtime_setup_required();
4165     if (log_is_enabled(Info, aot, init)) {
4166       ResourceMark rm;
4167       log_info(aot, init)("Found @AOTRuntimeSetup class %s", ik->external_name());
4168     }
4169   }
4170 }
4171 
4172 bool ClassFileParser::supports_inline_types() const {
4173   // Inline types are only supported by class file version 71.65535 and later
4174   return _major_version > JAVA_27_VERSION ||
4175          (_major_version == JAVA_27_VERSION && _minor_version == JAVA_PREVIEW_MINOR_VERSION);
4176 }
4177 
4178 // utility methods for appending an array with check for duplicates
4179 
4180 static void append_interfaces(GrowableArray<InstanceKlass*>* result,
4181                               const Array<InstanceKlass*>* const ifs) {
4182   // iterate over new interfaces
4183   for (int i = 0; i < ifs->length(); i++) {
4184     InstanceKlass* const e = ifs->at(i);
4185     assert(e->is_klass() && e->is_interface(), "just checking");
4186     // add new interface
4187     result->append_if_missing(e);
4188   }
4189 }
4190 
4191 static Array<InstanceKlass*>* compute_transitive_interfaces(const InstanceKlass* super,
4192                                                             Array<InstanceKlass*>* local_ifs,
4193                                                             ClassLoaderData* loader_data,
4194                                                             TRAPS) {
4195   assert(local_ifs != nullptr, "invariant");
4196   assert(loader_data != nullptr, "invariant");
4197 
4198   // Compute maximum size for transitive interfaces
4199   int max_transitive_size = 0;
4200   int super_size = 0;
4201   // Add superclass transitive interfaces size
4202   if (super != nullptr) {
4203     super_size = super->transitive_interfaces()->length();
4204     max_transitive_size += super_size;
4205   }
4206   // Add local interfaces' super interfaces
4207   const int local_size = local_ifs->length();
4208   for (int i = 0; i < local_size; i++) {
4209     InstanceKlass* const l = local_ifs->at(i);
4210     max_transitive_size += l->transitive_interfaces()->length();
4211   }
4212   // Finally add local interfaces
4213   max_transitive_size += local_size;
4214   // Construct array
4215   if (max_transitive_size == 0) {
4216     // no interfaces, use canonicalized array
4217     return Universe::the_empty_instance_klass_array();
4218   } else if (max_transitive_size == super_size) {
4219     // no new local interfaces added, share superklass' transitive interface array
4220     return super->transitive_interfaces();
4221     // The three lines below are commented to work around bug JDK-8245487
4222 //  } else if (max_transitive_size == local_size) {
4223 //    // only local interfaces added, share local interface array
4224 //    return local_ifs;
4225   } else {
4226     ResourceMark rm;
4227     GrowableArray<InstanceKlass*>* const result = new GrowableArray<InstanceKlass*>(max_transitive_size);
4228 
4229     // Copy down from superclass
4230     if (super != nullptr) {
4231       append_interfaces(result, super->transitive_interfaces());
4232     }
4233 
4234     // Copy down from local interfaces' superinterfaces
4235     for (int i = 0; i < local_size; i++) {
4236       InstanceKlass* const l = local_ifs->at(i);
4237       append_interfaces(result, l->transitive_interfaces());
4238     }
4239     // Finally add local interfaces
4240     append_interfaces(result, local_ifs);
4241 
4242     // length will be less than the max_transitive_size if duplicates were removed
4243     const int length = result->length();
4244     assert(length <= max_transitive_size, "just checking");
4245 
4246     Array<InstanceKlass*>* const new_result =
4247       MetadataFactory::new_array<InstanceKlass*>(loader_data, length, CHECK_NULL);
4248     for (int i = 0; i < length; i++) {
4249       InstanceKlass* const e = result->at(i);
4250       assert(e != nullptr, "just checking");
4251       new_result->at_put(i, e);
4252     }
4253     return new_result;
4254   }
4255 }
4256 
4257 void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) {
4258   assert(this_klass != nullptr, "invariant");
4259   const InstanceKlass* const super = this_klass->super();
4260 
4261   if (super != nullptr) {
4262     if (super->is_final()) {
4263       classfile_icce_error("class %s cannot inherit from final class %s", super, THREAD);
4264       return;
4265     }
4266 
4267     if (super->is_sealed()) {
4268       stringStream ss;
4269       ResourceMark rm(THREAD);
4270       if (!super->has_as_permitted_subclass(this_klass, ss)) {
4271         classfile_icce_error(ss.as_string(), THREAD);
4272         return;
4273       }
4274     }
4275 
4276     // The JVMS says that super classes for value types must not have the ACC_IDENTITY
4277     // flag set. But, java.lang.Object must still be allowed to be a direct super class
4278     // for a value classes.  So, it is treated as a special case for now.
4279     if (!this_klass->access_flags().is_identity_class() &&
4280         super->name() != vmSymbols::java_lang_Object() &&
4281         super->is_identity_class()) {
4282       classfile_icce_error("value class %s cannot inherit from class %s", super, THREAD);
4283       return;
4284     }
4285 
4286     Reflection::VerifyClassAccessResults vca_result =
4287       Reflection::verify_class_access(this_klass, super, false);
4288     if (vca_result != Reflection::ACCESS_OK) {
4289       ResourceMark rm(THREAD);
4290       char* msg = Reflection::verify_class_access_msg(this_klass,
4291                                                       super,
4292                                                       vca_result);
4293 
4294       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4295       if (msg == nullptr) {
4296         bool same_module = (this_klass->module() == super->module());
4297         Exceptions::fthrow(
4298           THREAD_AND_LOCATION,
4299           vmSymbols::java_lang_IllegalAccessError(),
4300           "class %s cannot access its %ssuperclass %s (%s%s%s)",
4301           this_klass->external_name(),
4302           super->is_abstract() ? "abstract " : "",
4303           super->external_name(),
4304           (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(),
4305           (same_module) ? "" : "; ",
4306           (same_module) ? "" : super->class_in_module_of_loader());
4307       } else {
4308         // Add additional message content.
4309         Exceptions::fthrow(
4310           THREAD_AND_LOCATION,
4311           vmSymbols::java_lang_IllegalAccessError(),
4312           "superclass access check failed: %s",
4313           msg);
4314       }
4315     }
4316   }
4317 }
4318 
4319 
4320 void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) {
4321   assert(this_klass != nullptr, "invariant");
4322   const Array<InstanceKlass*>* const local_interfaces = this_klass->local_interfaces();
4323   const int lng = local_interfaces->length();
4324   for (int i = lng - 1; i >= 0; i--) {
4325     InstanceKlass* const k = local_interfaces->at(i);
4326     assert (k != nullptr && k->is_interface(), "invalid interface");
4327 
4328     if (k->is_sealed()) {
4329       stringStream ss;
4330       ResourceMark rm(THREAD);
4331       if (!k->has_as_permitted_subclass(this_klass, ss)) {
4332         classfile_icce_error(ss.as_string(), THREAD);
4333         return;
4334       }
4335     }
4336 
4337     Reflection::VerifyClassAccessResults vca_result =
4338       Reflection::verify_class_access(this_klass, k, false);
4339     if (vca_result != Reflection::ACCESS_OK) {
4340       ResourceMark rm(THREAD);
4341       char* msg = Reflection::verify_class_access_msg(this_klass,
4342                                                       k,
4343                                                       vca_result);
4344 
4345       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4346       if (msg == nullptr) {
4347         bool same_module = (this_klass->module() == k->module());
4348         Exceptions::fthrow(
4349           THREAD_AND_LOCATION,
4350           vmSymbols::java_lang_IllegalAccessError(),
4351           "class %s cannot access its superinterface %s (%s%s%s)",
4352           this_klass->external_name(),
4353           k->external_name(),
4354           (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(),
4355           (same_module) ? "" : "; ",
4356           (same_module) ? "" : k->class_in_module_of_loader());
4357         return;
4358       } else {
4359         // Add additional message content.
4360         Exceptions::fthrow(
4361           THREAD_AND_LOCATION,
4362           vmSymbols::java_lang_IllegalAccessError(),
4363           "superinterface check failed: %s",
4364           msg);
4365         return;
4366       }
4367     }
4368   }
4369 }
4370 
4371 
4372 static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) {
4373   assert(this_klass != nullptr, "invariant");
4374   const Array<Method*>* const methods = this_klass->methods();
4375   const int num_methods = methods->length();
4376 
4377   // go thru each method and check if it overrides a final method
4378   for (int index = 0; index < num_methods; index++) {
4379     const Method* const m = methods->at(index);
4380 
4381     // skip private, static, and <init> methods
4382     if ((!m->is_private() && !m->is_static()) &&
4383         (m->name() != vmSymbols::object_initializer_name())) {
4384 
4385       const Symbol* const name = m->name();
4386       const Symbol* const signature = m->signature();
4387       const InstanceKlass* k = this_klass->super();
4388       const Method* super_m = nullptr;
4389       while (k != nullptr) {
4390         // skip supers that don't have final methods.
4391         if (k->has_final_method()) {
4392           // lookup a matching method in the super class hierarchy
4393           super_m = k->lookup_method(name, signature);
4394           if (super_m == nullptr) {
4395             break; // didn't find any match; get out
4396           }
4397 
4398           if (super_m->is_final() && !super_m->is_static() &&
4399               !super_m->access_flags().is_private()) {
4400             // matching method in super is final, and not static or private
4401             bool can_access = Reflection::verify_member_access(this_klass,
4402                                                                super_m->method_holder(),
4403                                                                super_m->method_holder(),
4404                                                                super_m->access_flags(),
4405                                                               false, false, CHECK);
4406             if (can_access) {
4407               // this class can access super final method and therefore override
4408               ResourceMark rm(THREAD);
4409               THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
4410                         err_msg("class %s overrides final method %s.%s%s",
4411                                 this_klass->external_name(),
4412                                 super_m->method_holder()->external_name(),
4413                                 name->as_C_string(),
4414                                 signature->as_C_string()));
4415             }
4416           }
4417 
4418           // continue to look from super_m's holder's super.
4419           k = super_m->method_holder()->super();
4420           continue;
4421         }
4422 
4423         k = k->super();
4424       }
4425     }
4426   }
4427 }
4428 
4429 
4430 // assumes that this_klass is an interface
4431 static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) {
4432   assert(this_klass != nullptr, "invariant");
4433   assert(this_klass->is_interface(), "not an interface");
4434   const Array<Method*>* methods = this_klass->methods();
4435   const int num_methods = methods->length();
4436 
4437   for (int index = 0; index < num_methods; index++) {
4438     const Method* const m = methods->at(index);
4439     // if m is static and not the init method, throw a verify error
4440     if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) {
4441       ResourceMark rm(THREAD);
4442 
4443       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4444       Exceptions::fthrow(
4445         THREAD_AND_LOCATION,
4446         vmSymbols::java_lang_VerifyError(),
4447         "Illegal static method %s in interface %s",
4448         m->name()->as_C_string(),
4449         this_klass->external_name()
4450       );
4451       return;
4452     }
4453   }
4454 }
4455 
4456 // utility methods for format checking
4457 
4458 // Verify the class modifiers for the current class, or an inner class if inner_name is non-null.
4459 void ClassFileParser::verify_legal_class_modifiers(jint flags, Symbol* inner_name, bool is_anonymous_inner_class, TRAPS) const {
4460   const bool is_module = (flags & JVM_ACC_MODULE) != 0;
4461   assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set");
4462   if (is_module) {
4463     ResourceMark rm(THREAD);
4464     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4465     Exceptions::fthrow(
4466       THREAD_AND_LOCATION,
4467       vmSymbols::java_lang_NoClassDefFoundError(),
4468       "%s is not a class because access_flag ACC_MODULE is set",
4469       _class_name->as_C_string());
4470     return;
4471   }
4472 
4473   if (!_need_verify) { return; }
4474 
4475   const bool is_interface  = (flags & JVM_ACC_INTERFACE)  != 0;
4476   const bool is_abstract   = (flags & JVM_ACC_ABSTRACT)   != 0;
4477   const bool is_final      = (flags & JVM_ACC_FINAL)      != 0;
4478   const bool is_identity   = (flags & JVM_ACC_IDENTITY)   != 0;
4479   const bool is_enum       = (flags & JVM_ACC_ENUM)       != 0;
4480   const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0;
4481   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4482   const bool valid_value_class = is_identity || is_interface ||
4483                                  (supports_inline_types() && (!is_identity && (is_abstract || is_final)));
4484 
4485   if ((is_abstract && is_final) ||
4486       (is_interface && !is_abstract) ||
4487       (is_interface && major_gte_1_5 && (is_identity || is_enum)) ||   //  ACC_SUPER (now ACC_IDENTITY) was illegal for interfaces
4488       (!is_interface && major_gte_1_5 && is_annotation) ||
4489       (!valid_value_class)) {
4490     ResourceMark rm(THREAD);
4491     const char* class_note = "";
4492     if (!valid_value_class) {
4493       class_note = " (a value class must be final or else abstract)";
4494     }
4495     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4496     if (inner_name == nullptr && !is_anonymous_inner_class) {
4497       Exceptions::fthrow(
4498         THREAD_AND_LOCATION,
4499         vmSymbols::java_lang_ClassFormatError(),
4500         "Illegal class modifiers in class %s: 0x%X",
4501         _class_name->as_C_string(), flags
4502       );
4503     } else {
4504       if (is_anonymous_inner_class) {
4505         Exceptions::fthrow(
4506           THREAD_AND_LOCATION,
4507           vmSymbols::java_lang_ClassFormatError(),
4508           "Illegal class modifiers in anonymous inner class of class %s: 0x%X",
4509           _class_name->as_C_string(), flags
4510         );
4511       } else {
4512         Exceptions::fthrow(
4513           THREAD_AND_LOCATION,
4514           vmSymbols::java_lang_ClassFormatError(),
4515           "Illegal class modifiers in inner class %s of class %s: 0x%X",
4516           inner_name->as_C_string(), _class_name->as_C_string(), flags
4517         );
4518       }
4519     }
4520     return;
4521   }
4522 }
4523 
4524 static bool has_illegal_visibility(jint flags) {
4525   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4526   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4527   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4528 
4529   return ((is_public && is_protected) ||
4530           (is_public && is_private) ||
4531           (is_protected && is_private));
4532 }
4533 
4534 // A legal major_version.minor_version must be one of the following:
4535 //
4536 //  Major_version >= 45 and major_version < 56, any minor_version.
4537 //  Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0.
4538 //  Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present.
4539 //
4540 void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){
4541   ResourceMark rm(THREAD);
4542   const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION;
4543   if (major < JAVA_MIN_SUPPORTED_VERSION) {
4544     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version",
4545                          class_name, major, minor, THREAD);
4546     return;
4547   }
4548 
4549   if (major > max_version) {
4550     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4551     Exceptions::fthrow(
4552       THREAD_AND_LOCATION,
4553       vmSymbols::java_lang_UnsupportedClassVersionError(),
4554       "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), "
4555       "this version of the Java Runtime only recognizes class file versions up to %u.0",
4556       class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION);
4557     return;
4558   }
4559 
4560   if (major < JAVA_12_VERSION || minor == 0) {
4561     return;
4562   }
4563 
4564   if (minor == JAVA_PREVIEW_MINOR_VERSION) {
4565     if (major != max_version) {
4566       // Names are all known to be < 64k so we know this formatted message is not excessively large.
4567       Exceptions::fthrow(
4568         THREAD_AND_LOCATION,
4569         vmSymbols::java_lang_UnsupportedClassVersionError(),
4570         "%s (class file version %u.%u) was compiled with preview features that are unsupported. "
4571         "This version of the Java Runtime only recognizes preview features for class file version %u.%u",
4572         class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION);
4573       return;
4574     }
4575 
4576     if (!Arguments::enable_preview()) {
4577       classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'",
4578                            class_name, major, minor, THREAD);
4579       return;
4580     }
4581 
4582   } else { // minor != JAVA_PREVIEW_MINOR_VERSION
4583     classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version",
4584                          class_name, major, minor, THREAD);
4585   }
4586 }
4587 
4588 void ClassFileParser:: verify_legal_field_modifiers(jint flags,
4589                                                    AccessFlags class_access_flags,
4590                                                    TRAPS) const {
4591   if (!_need_verify) { return; }
4592 
4593   const bool is_public    = (flags & JVM_ACC_PUBLIC)    != 0;
4594   const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0;
4595   const bool is_private   = (flags & JVM_ACC_PRIVATE)   != 0;
4596   const bool is_static    = (flags & JVM_ACC_STATIC)    != 0;
4597   const bool is_final     = (flags & JVM_ACC_FINAL)     != 0;
4598   const bool is_volatile  = (flags & JVM_ACC_VOLATILE)  != 0;
4599   const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0;
4600   const bool is_enum      = (flags & JVM_ACC_ENUM)      != 0;
4601   const bool is_strict    = (flags & JVM_ACC_STRICT)    != 0;
4602   const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION;
4603 
4604   const bool is_interface = class_access_flags.is_interface();
4605   const bool is_identity_class = class_access_flags.is_identity_class();
4606 
4607   bool is_illegal = false;
4608   const char* error_msg = "";
4609 
4610   // There is some overlap in the checks that apply, for example interface fields
4611   // must be static, static fields can't be strict, and therefore interfaces can't
4612   // have strict fields. So we don't have to check every possible invalid combination
4613   // individually as long as all are covered. Once we have found an illegal combination
4614   // we can stop checking.
4615 
4616   if (!is_illegal) {
4617     if (is_interface) {
4618       if (!is_public || !is_static || !is_final || is_private ||
4619           is_protected || is_volatile || is_transient ||
4620           (major_gte_1_5 && is_enum)) {
4621         is_illegal = true;
4622         error_msg = "interface fields must be public, static and final, and may be synthetic";
4623       }
4624     } else { // not interface
4625       if (has_illegal_visibility(flags)) {
4626         is_illegal = true;
4627         error_msg = "invalid visibility flags for class field";
4628       } else if (is_final && is_volatile) {
4629         is_illegal = true;
4630         error_msg = "fields cannot be final and volatile";
4631       } else if (supports_inline_types()) {
4632         if (!is_identity_class && !is_static && (!is_strict || !is_final)) {
4633           is_illegal = true;
4634           error_msg = "value class fields must be either non-static final and strict, or static";
4635         }
4636       }
4637     }
4638   }
4639 
4640   if (is_illegal) {
4641     ResourceMark rm(THREAD);
4642     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4643     Exceptions::fthrow(
4644       THREAD_AND_LOCATION,
4645       vmSymbols::java_lang_ClassFormatError(),
4646       "Illegal field modifiers (%s) in class %s: 0x%X",
4647       error_msg, _class_name->as_C_string(), flags);
4648     return;
4649   }
4650 }
4651 
4652 void ClassFileParser::verify_legal_method_modifiers(jint flags,
4653                                                     AccessFlags class_access_flags,
4654                                                     const Symbol* name,
4655                                                     TRAPS) const {
4656   if (!_need_verify) { return; }
4657 
4658   const bool is_public       = (flags & JVM_ACC_PUBLIC)       != 0;
4659   const bool is_private      = (flags & JVM_ACC_PRIVATE)      != 0;
4660   const bool is_static       = (flags & JVM_ACC_STATIC)       != 0;
4661   const bool is_final        = (flags & JVM_ACC_FINAL)        != 0;
4662   const bool is_native       = (flags & JVM_ACC_NATIVE)       != 0;
4663   const bool is_abstract     = (flags & JVM_ACC_ABSTRACT)     != 0;
4664   const bool is_bridge       = (flags & JVM_ACC_BRIDGE)       != 0;
4665   const bool is_strict       = (flags & JVM_ACC_STRICT)       != 0;
4666   const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0;
4667   const bool is_protected    = (flags & JVM_ACC_PROTECTED)    != 0;
4668   const bool major_gte_1_5   = _major_version >= JAVA_1_5_VERSION;
4669   const bool major_gte_8     = _major_version >= JAVA_8_VERSION;
4670   const bool major_gte_17    = _major_version >= JAVA_17_VERSION;
4671   const bool is_initializer  = (name == vmSymbols::object_initializer_name());
4672   // LW401 CR required: removal of value factories support
4673   const bool is_interface    = class_access_flags.is_interface();
4674   const bool is_identity_class = class_access_flags.is_identity_class();
4675   const bool is_abstract_class = class_access_flags.is_abstract();
4676 
4677   bool is_illegal = false;
4678 
4679   const char* class_note = "";
4680   if (is_interface) {
4681     if (major_gte_8) {
4682       // Class file version is JAVA_8_VERSION or later Methods of
4683       // interfaces may set any of the flags except ACC_PROTECTED,
4684       // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must
4685       // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set.
4686       if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */
4687           (is_native || is_protected || is_final || is_synchronized) ||
4688           // If a specific method of a class or interface has its
4689           // ACC_ABSTRACT flag set, it must not have any of its
4690           // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC,
4691           // ACC_STRICT, or ACC_SYNCHRONIZED flags set.  No need to
4692           // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as
4693           // those flags are illegal irrespective of ACC_ABSTRACT being set or not.
4694           (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) {
4695         is_illegal = true;
4696       }
4697     } else if (major_gte_1_5) {
4698       // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION)
4699       if (!is_public || is_private || is_protected || is_static || is_final ||
4700           is_synchronized || is_native || !is_abstract || is_strict) {
4701         is_illegal = true;
4702       }
4703     } else {
4704       // Class file version is pre-JAVA_1_5_VERSION
4705       if (!is_public || is_static || is_final || is_native || !is_abstract) {
4706         is_illegal = true;
4707       }
4708     }
4709   } else { // not interface
4710     if (has_illegal_visibility(flags)) {
4711       is_illegal = true;
4712     } else {
4713       if (is_initializer) {
4714         if (is_static || is_final || is_synchronized || is_native ||
4715             is_abstract || (major_gte_1_5 && is_bridge)) {
4716           is_illegal = true;
4717         }
4718       } else { // not initializer
4719         if (!is_identity_class && is_synchronized && !is_static) {
4720           is_illegal = true;
4721           class_note = " (not an identity class)";
4722         } else {
4723           if (is_abstract) {
4724             if ((is_final || is_native || is_private || is_static ||
4725                 (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) {
4726               is_illegal = true;
4727             }
4728           }
4729         }
4730       }
4731     }
4732   }
4733 
4734   if (is_illegal) {
4735     ResourceMark rm(THREAD);
4736     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4737     Exceptions::fthrow(
4738       THREAD_AND_LOCATION,
4739       vmSymbols::java_lang_ClassFormatError(),
4740       "Method %s in class %s%s has illegal modifiers: 0x%X",
4741       name->as_C_string(), _class_name->as_C_string(),
4742       class_note, flags);
4743     return;
4744   }
4745 }
4746 
4747 void ClassFileParser::verify_legal_utf8(const unsigned char* buffer,
4748                                         int length,
4749                                         TRAPS) const {
4750   assert(_need_verify, "only called when _need_verify is true");
4751   // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP.
4752   if (!UTF8::is_legal_utf8(buffer, static_cast<size_t>(length), _major_version <= 47)) {
4753     classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD);
4754   }
4755 }
4756 
4757 // Unqualified names may not contain the characters '.', ';', '[', or '/'.
4758 // In class names, '/' separates unqualified names.  This is verified in this function also.
4759 // Method names also may not contain the characters '<' or '>', unless <init>
4760 // or <clinit>.  Note that method names may not be <init> or <clinit> in this
4761 // method.  Because these names have been checked as special cases before
4762 // calling this method in verify_legal_method_name.
4763 //
4764 // This method is also called from the modular system APIs in modules.cpp
4765 // to verify the validity of module and package names.
4766 bool ClassFileParser::verify_unqualified_name(const char* name,
4767                                               unsigned int length,
4768                                               int type) {
4769   if (length == 0) return false;  // Must have at least one char.
4770   for (const char* p = name; p != name + length; p++) {
4771     switch(*p) {
4772       case JVM_SIGNATURE_DOT:
4773       case JVM_SIGNATURE_ENDCLASS:
4774       case JVM_SIGNATURE_ARRAY:
4775         // do not permit '.', ';', or '['
4776         return false;
4777       case JVM_SIGNATURE_SLASH:
4778         // check for '//' or leading or trailing '/' which are not legal
4779         // unqualified name must not be empty
4780         if (type == ClassFileParser::LegalClass) {
4781           if (p == name || p+1 >= name+length ||
4782               *(p+1) == JVM_SIGNATURE_SLASH) {
4783             return false;
4784           }
4785         } else {
4786           return false;   // do not permit '/' unless it's class name
4787         }
4788         break;
4789       case JVM_SIGNATURE_SPECIAL:
4790       case JVM_SIGNATURE_ENDSPECIAL:
4791         // do not permit '<' or '>' in method names
4792         if (type == ClassFileParser::LegalMethod) {
4793           return false;
4794         }
4795     }
4796   }
4797   return true;
4798 }
4799 
4800 bool ClassFileParser::is_class_in_loadable_descriptors_attribute(Symbol *klass) {
4801   if (_loadable_descriptors == nullptr) return false;
4802   for (int i = 0; i < _loadable_descriptors->length(); i++) {
4803         Symbol* class_name = _cp->symbol_at(_loadable_descriptors->at(i));
4804         if (class_name == klass) return true;
4805   }
4806   return false;
4807 }
4808 
4809 // Take pointer to a UTF8 byte string (not NUL-terminated).
4810 // Skip over the longest part of the string that could
4811 // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true.
4812 // Return a pointer to just past the fieldname.
4813 // Return null if no fieldname at all was found, or in the case of slash_ok
4814 // being true, we saw consecutive slashes (meaning we were looking for a
4815 // qualified path but found something that was badly-formed).
4816 static const char* skip_over_field_name(const char* const name,
4817                                         bool slash_ok,
4818                                         unsigned int length) {
4819   const char* p;
4820   jboolean last_is_slash = false;
4821   jboolean not_first_ch = false;
4822 
4823   for (p = name; p != name + length; not_first_ch = true) {
4824     const char* old_p = p;
4825     jchar ch = *p;
4826     if (ch < 128) {
4827       p++;
4828       // quick check for ascii
4829       if ((ch >= 'a' && ch <= 'z') ||
4830         (ch >= 'A' && ch <= 'Z') ||
4831         (ch == '_' || ch == '$') ||
4832         (not_first_ch && ch >= '0' && ch <= '9')) {
4833         last_is_slash = false;
4834         continue;
4835       }
4836       if (slash_ok && ch == JVM_SIGNATURE_SLASH) {
4837         if (last_is_slash) {
4838           return nullptr;  // Don't permit consecutive slashes
4839         }
4840         last_is_slash = true;
4841         continue;
4842       }
4843     }
4844     else {
4845       jint unicode_ch;
4846       char* tmp_p = UTF8::next_character(p, &unicode_ch);
4847       p = tmp_p;
4848       last_is_slash = false;
4849       // Check if ch is Java identifier start or is Java identifier part
4850       // 4672820: call java.lang.Character methods directly without generating separate tables.
4851       EXCEPTION_MARK;
4852       // return value
4853       JavaValue result(T_BOOLEAN);
4854       // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart
4855       JavaCallArguments args;
4856       args.push_int(unicode_ch);
4857 
4858       if (not_first_ch) {
4859         // public static boolean isJavaIdentifierPart(char ch);
4860         JavaCalls::call_static(&result,
4861           vmClasses::Character_klass(),
4862           vmSymbols::isJavaIdentifierPart_name(),
4863           vmSymbols::int_bool_signature(),
4864           &args,
4865           THREAD);
4866       } else {
4867         // public static boolean isJavaIdentifierStart(char ch);
4868         JavaCalls::call_static(&result,
4869           vmClasses::Character_klass(),
4870           vmSymbols::isJavaIdentifierStart_name(),
4871           vmSymbols::int_bool_signature(),
4872           &args,
4873           THREAD);
4874       }
4875       if (HAS_PENDING_EXCEPTION) {
4876         CLEAR_PENDING_EXCEPTION;
4877         return nullptr;
4878       }
4879       if(result.get_jboolean()) {
4880         continue;
4881       }
4882     }
4883     return (not_first_ch) ? old_p : nullptr;
4884   }
4885   return (not_first_ch && !last_is_slash) ? p : nullptr;
4886 }
4887 
4888 // Take pointer to a UTF8 byte string (not NUL-terminated).
4889 // Skip over the longest part of the string that could
4890 // be taken as a field signature. Allow "void" if void_ok.
4891 // Return a pointer to just past the signature.
4892 // Return null if no legal signature is found.
4893 const char* ClassFileParser::skip_over_field_signature(const char* signature,
4894                                                        bool void_ok,
4895                                                        unsigned int length,
4896                                                        TRAPS) const {
4897   unsigned int array_dim = 0;
4898   while (length > 0) {
4899     switch (signature[0]) {
4900     case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; }
4901     case JVM_SIGNATURE_BOOLEAN:
4902     case JVM_SIGNATURE_BYTE:
4903     case JVM_SIGNATURE_CHAR:
4904     case JVM_SIGNATURE_SHORT:
4905     case JVM_SIGNATURE_INT:
4906     case JVM_SIGNATURE_FLOAT:
4907     case JVM_SIGNATURE_LONG:
4908     case JVM_SIGNATURE_DOUBLE:
4909       return signature + 1;
4910     case JVM_SIGNATURE_CLASS:
4911     {
4912       if (_major_version < JAVA_1_5_VERSION) {
4913         signature++;
4914         length--;
4915         // Skip over the class name if one is there
4916         const char* const p = skip_over_field_name(signature, true, length);
4917         assert(p == nullptr || p > signature, "must parse one character at least");
4918         // The next character better be a semicolon
4919         if (p != nullptr                             && // Parse of field name succeeded.
4920             p - signature < static_cast<int>(length) && // There is at least one character left to parse.
4921             p[0] == JVM_SIGNATURE_ENDCLASS) {
4922           return p + 1;
4923         }
4924       }
4925       else {
4926         // Skip leading 'L' or 'Q' and ignore first appearance of ';'
4927         signature++;
4928         const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1);
4929         // Format check signature
4930         if (c != nullptr) {
4931           int newlen = pointer_delta_as_int(c, (char*) signature);
4932           bool legal = verify_unqualified_name(signature, newlen, LegalClass);
4933           if (!legal) {
4934             classfile_parse_error("Class name is empty or contains illegal character "
4935                                   "in descriptor in class file %s",
4936                                   THREAD);
4937             return nullptr;
4938           }
4939           return signature + newlen + 1;
4940         }
4941       }
4942       return nullptr;
4943     }
4944     case JVM_SIGNATURE_ARRAY:
4945       array_dim++;
4946       if (array_dim > 255) {
4947         // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions.
4948         classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD);
4949         return nullptr;
4950       }
4951       // The rest of what's there better be a legal signature
4952       signature++;
4953       length--;
4954       void_ok = false;
4955       break;
4956     default:
4957       return nullptr;
4958     }
4959   }
4960   return nullptr;
4961 }
4962 
4963 // Checks if name is a legal class name.
4964 void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const {
4965   if (!_need_verify) { return; }
4966 
4967   assert(name->refcount() > 0, "symbol must be kept alive");
4968   char* bytes = (char*)name->bytes();
4969   unsigned int length = name->utf8_length();
4970   bool legal = false;
4971 
4972   if (length > 0) {
4973     const char* p;
4974     if (bytes[0] == JVM_SIGNATURE_ARRAY) {
4975       p = skip_over_field_signature(bytes, false, length, CHECK);
4976       legal = (p != nullptr) && ((p - bytes) == (int)length);
4977     } else if (_major_version < JAVA_1_5_VERSION) {
4978       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
4979         p = skip_over_field_name(bytes, true, length);
4980         legal = (p != nullptr) && ((p - bytes) == (int)length);
4981       }
4982     } else if ((_major_version >= CONSTANT_CLASS_DESCRIPTORS || _class_name->starts_with("jdk/internal/reflect/"))
4983                    && bytes[length - 1] == ';' ) {
4984       // Support for L...; descriptors
4985       legal = verify_unqualified_name(bytes + 1, length - 2, LegalClass);
4986     } else {
4987       // 4900761: relax the constraints based on JSR202 spec
4988       // Class names may be drawn from the entire Unicode character set.
4989       // Identifiers between '/' must be unqualified names.
4990       // The utf8 string has been verified when parsing cpool entries.
4991       legal = verify_unqualified_name(bytes, length, LegalClass);
4992     }
4993   }
4994   if (!legal) {
4995     ResourceMark rm(THREAD);
4996     assert(_class_name != nullptr, "invariant");
4997     // Names are all known to be < 64k so we know this formatted message is not excessively large.
4998     Exceptions::fthrow(
4999       THREAD_AND_LOCATION,
5000       vmSymbols::java_lang_ClassFormatError(),
5001       "Illegal class name \"%.*s\" in class file %s", length, bytes,
5002       _class_name->as_C_string()
5003     );
5004     return;
5005   }
5006 }
5007 
5008 // Checks if name is a legal field name.
5009 void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const {
5010   if (!_need_verify) { return; }
5011 
5012   char* bytes = (char*)name->bytes();
5013   unsigned int length = name->utf8_length();
5014   bool legal = false;
5015 
5016   if (length > 0) {
5017     if (_major_version < JAVA_1_5_VERSION) {
5018       if (bytes[0] != JVM_SIGNATURE_SPECIAL) {
5019         const char* p = skip_over_field_name(bytes, false, length);
5020         legal = (p != nullptr) && ((p - bytes) == (int)length);
5021       }
5022     } else {
5023       // 4881221: relax the constraints based on JSR202 spec
5024       legal = verify_unqualified_name(bytes, length, LegalField);
5025     }
5026   }
5027 
5028   if (!legal) {
5029     ResourceMark rm(THREAD);
5030     assert(_class_name != nullptr, "invariant");
5031     // Names are all known to be < 64k so we know this formatted message is not excessively large.
5032     Exceptions::fthrow(
5033       THREAD_AND_LOCATION,
5034       vmSymbols::java_lang_ClassFormatError(),
5035       "Illegal field name \"%.*s\" in class %s", length, bytes,
5036       _class_name->as_C_string()
5037     );
5038     return;
5039   }
5040 }
5041 
5042 // Checks if name is a legal method name.
5043 void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const {
5044   if (!_need_verify) { return; }
5045 
5046   assert(name != nullptr, "method name is null");
5047   char* bytes = (char*)name->bytes();
5048   unsigned int length = name->utf8_length();
5049   bool legal = false;
5050 
5051   if (length > 0) {
5052     if (bytes[0] == JVM_SIGNATURE_SPECIAL) {
5053       if (name == vmSymbols::object_initializer_name() ||
5054           name == vmSymbols::class_initializer_name()) {
5055         legal = true;
5056       }
5057     } else if (_major_version < JAVA_1_5_VERSION) {
5058       const char* p;
5059       p = skip_over_field_name(bytes, false, length);
5060       legal = (p != nullptr) && ((p - bytes) == (int)length);
5061     } else {
5062       // 4881221: relax the constraints based on JSR202 spec
5063       legal = verify_unqualified_name(bytes, length, LegalMethod);
5064     }
5065   }
5066 
5067   if (!legal) {
5068     ResourceMark rm(THREAD);
5069     assert(_class_name != nullptr, "invariant");
5070     // Names are all known to be < 64k so we know this formatted message is not excessively large.
5071     Exceptions::fthrow(
5072       THREAD_AND_LOCATION,
5073       vmSymbols::java_lang_ClassFormatError(),
5074       "Illegal method name \"%.*s\" in class %s", length, bytes,
5075       _class_name->as_C_string()
5076     );
5077     return;
5078   }
5079 }
5080 
5081 bool ClassFileParser::legal_field_signature(const Symbol* signature, TRAPS) const {
5082   const char* const bytes = (const char*)signature->bytes();
5083   const unsigned int length = signature->utf8_length();
5084   const char* const p = skip_over_field_signature(bytes, false, length, CHECK_false);
5085 
5086   if (p == nullptr || (p - bytes) != (int)length) {
5087     return false;
5088   }
5089   return true;
5090 }
5091 
5092 // Checks if signature is a legal field signature.
5093 void ClassFileParser::verify_legal_field_signature(const Symbol* name,
5094                                                    const Symbol* signature,
5095                                                    TRAPS) const {
5096   if (!_need_verify) { return; }
5097 
5098   const char* const bytes = (const char*)signature->bytes();
5099   const unsigned int length = signature->utf8_length();
5100   const char* const p = skip_over_field_signature(bytes, false, length, CHECK);
5101 
5102   if (p == nullptr || (p - bytes) != (int)length) {
5103     throwIllegalSignature("Field", name, signature, CHECK);
5104   }
5105 }
5106 
5107 // Check that the signature is compatible with the method name.  For example,
5108 // check that <init> has a void signature.
5109 void ClassFileParser::verify_legal_name_with_signature(const Symbol* name,
5110                                                        const Symbol* signature,
5111                                                        TRAPS) const {
5112   if (!_need_verify) {
5113     return;
5114   }
5115 
5116   // Class initializers cannot have args for class format version >= 51.
5117   if (name == vmSymbols::class_initializer_name() &&
5118       signature != vmSymbols::void_method_signature() &&
5119       _major_version >= JAVA_7_VERSION) {
5120     throwIllegalSignature("Method", name, signature, THREAD);
5121     return;
5122   }
5123 
5124   int sig_length = signature->utf8_length();
5125   if (name->utf8_length() > 0 &&
5126     name->char_at(0) == JVM_SIGNATURE_SPECIAL &&
5127     sig_length > 0 &&
5128     signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) {
5129     throwIllegalSignature("Method", name, signature, THREAD);
5130   }
5131 }
5132 
5133 // Checks if signature is a legal method signature.
5134 // Returns number of parameters
5135 int ClassFileParser::verify_legal_method_signature(const Symbol* name,
5136                                                    const Symbol* signature,
5137                                                    TRAPS) const {
5138   if (!_need_verify) {
5139     // make sure caller's args_size will be less than 0 even for non-static
5140     // method so it will be recomputed in compute_size_of_parameters().
5141     return -2;
5142   }
5143 
5144   unsigned int args_size = 0;
5145   const char* p = (const char*)signature->bytes();
5146   unsigned int length = signature->utf8_length();
5147   const char* nextp;
5148 
5149   // The first character must be a '('
5150   if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) {
5151     length--;
5152     // Skip over legal field signatures
5153     nextp = skip_over_field_signature(p, false, length, CHECK_0);
5154     while ((length > 0) && (nextp != nullptr)) {
5155       args_size++;
5156       if (p[0] == 'J' || p[0] == 'D') {
5157         args_size++;
5158       }
5159       length -= pointer_delta_as_int(nextp, p);
5160       p = nextp;
5161       nextp = skip_over_field_signature(p, false, length, CHECK_0);
5162     }
5163     // The first non-signature thing better be a ')'
5164     if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) {
5165       length--;
5166       // Now we better just have a return value
5167       nextp = skip_over_field_signature(p, true, length, CHECK_0);
5168       if (nextp && ((int)length == (nextp - p))) {
5169         return args_size;
5170       }
5171     }
5172   }
5173   // Report error
5174   throwIllegalSignature("Method", name, signature, THREAD);
5175   return 0;
5176 }
5177 
5178 int ClassFileParser::static_field_size() const {
5179   assert(_layout_info != nullptr, "invariant");
5180   return _layout_info->_static_field_size;
5181 }
5182 
5183 int ClassFileParser::total_oop_map_count() const {
5184   assert(_layout_info != nullptr, "invariant");
5185   return _layout_info->oop_map_blocks->_nonstatic_oop_map_count;
5186 }
5187 
5188 jint ClassFileParser::layout_size() const {
5189   assert(_layout_info != nullptr, "invariant");
5190   return _layout_info->_instance_size;
5191 }
5192 
5193 static void check_methods_for_intrinsics(const InstanceKlass* ik,
5194                                          const Array<Method*>* methods) {
5195   assert(ik != nullptr, "invariant");
5196   assert(methods != nullptr, "invariant");
5197 
5198   // Set up Method*::intrinsic_id as soon as we know the names of methods.
5199   // (We used to do this lazily, but now we query it in Rewriter,
5200   // which is eagerly done for every method, so we might as well do it now,
5201   // when everything is fresh in memory.)
5202   const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik);
5203 
5204   if (klass_id != vmSymbolID::NO_SID) {
5205     for (int j = 0; j < methods->length(); ++j) {
5206       Method* method = methods->at(j);
5207       method->init_intrinsic_id(klass_id);
5208 
5209       if (CheckIntrinsics) {
5210         // Check if an intrinsic is defined for method 'method',
5211         // but the method is not annotated with @IntrinsicCandidate.
5212         if (method->intrinsic_id() != vmIntrinsics::_none &&
5213             !method->intrinsic_candidate()) {
5214               tty->print("Compiler intrinsic is defined for method [%s], "
5215               "but the method is not annotated with @IntrinsicCandidate.%s",
5216               method->name_and_sig_as_C_string(),
5217               NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.")
5218             );
5219           tty->cr();
5220           DEBUG_ONLY(vm_exit(1));
5221         }
5222         // Check is the method 'method' is annotated with @IntrinsicCandidate,
5223         // but there is no intrinsic available for it.
5224         if (method->intrinsic_candidate() &&
5225           method->intrinsic_id() == vmIntrinsics::_none) {
5226             tty->print("Method [%s] is annotated with @IntrinsicCandidate, "
5227               "but no compiler intrinsic is defined for the method.%s",
5228               method->name_and_sig_as_C_string(),
5229               NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5230             );
5231           tty->cr();
5232           DEBUG_ONLY(vm_exit(1));
5233         }
5234       }
5235     } // end for
5236 
5237 #ifdef ASSERT
5238     if (CheckIntrinsics) {
5239       // Check for orphan methods in the current class. A method m
5240       // of a class C is orphan if an intrinsic is defined for method m,
5241       // but class C does not declare m.
5242       // The check is potentially expensive, therefore it is available
5243       // only in debug builds.
5244 
5245       for (auto id : EnumRange<vmIntrinsicID>{}) {
5246         if (vmIntrinsics::_compiledLambdaForm == id) {
5247           // The _compiledLamdbdaForm intrinsic is a special marker for bytecode
5248           // generated for the JVM from a LambdaForm and therefore no method
5249           // is defined for it.
5250           continue;
5251         }
5252         if (vmIntrinsics::_blackhole == id) {
5253           // The _blackhole intrinsic is a special marker. No explicit method
5254           // is defined for it.
5255           continue;
5256         }
5257 
5258         if (vmIntrinsics::class_for(id) == klass_id) {
5259           // Check if the current class contains a method with the same
5260           // name, flags, signature.
5261           bool match = false;
5262           for (int j = 0; j < methods->length(); ++j) {
5263             const Method* method = methods->at(j);
5264             if (method->intrinsic_id() == id) {
5265               match = true;
5266               break;
5267             }
5268           }
5269 
5270           if (!match) {
5271             char buf[1000];
5272             tty->print("Compiler intrinsic is defined for method [%s], "
5273                        "but the method is not available in class [%s].%s",
5274                         vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)),
5275                         ik->name()->as_C_string(),
5276                         NOT_DEBUG("") DEBUG_ONLY(" Exiting.")
5277             );
5278             tty->cr();
5279             DEBUG_ONLY(vm_exit(1));
5280           }
5281         }
5282       } // end for
5283     } // CheckIntrinsics
5284 #endif // ASSERT
5285   }
5286 }
5287 
5288 InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook,
5289                                                       const ClassInstanceInfo& cl_inst_info,
5290                                                       TRAPS) {
5291   if (_klass != nullptr) {
5292     return _klass;
5293   }
5294 
5295   InstanceKlass* const ik =
5296     InstanceKlass::allocate_instance_klass(*this, CHECK_NULL);
5297 
5298   if (is_hidden()) {
5299     mangle_hidden_class_name(ik);
5300   }
5301 
5302   fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL);
5303 
5304   assert(_klass == ik, "invariant");

5305   return ik;
5306 }
5307 
5308 void ClassFileParser::fill_instance_klass(InstanceKlass* ik,
5309                                           bool changed_by_loadhook,
5310                                           const ClassInstanceInfo& cl_inst_info,
5311                                           TRAPS) {
5312   assert(ik != nullptr, "invariant");
5313 
5314   // Set name and CLD before adding to CLD
5315   ik->set_class_loader_data(_loader_data);
5316   ik->set_class_loader_type();
5317   ik->set_name(_class_name);
5318 
5319   // Add all classes to our internal class loader list here,
5320   // including classes in the bootstrap (null) class loader.
5321   const bool publicize = !is_internal();
5322 
5323   _loader_data->add_class(ik, publicize);
5324 
5325   set_klass_to_deallocate(ik);
5326 
5327   assert(_layout_info != nullptr, "invariant");
5328   assert(ik->static_field_size() == _layout_info->_static_field_size, "sanity");
5329   assert(ik->nonstatic_oop_map_count() == _layout_info->oop_map_blocks->_nonstatic_oop_map_count,
5330          "sanity");
5331 
5332   assert(ik->is_instance_klass(), "sanity");
5333   assert(ik->size_helper() == _layout_info->_instance_size, "sanity");
5334 
5335   // Fill in information already parsed
5336   ik->set_should_verify_class(_need_verify);
5337 
5338   // Not yet: supers are done below to support the new subtype-checking fields
5339   ik->set_nonstatic_field_size(_layout_info->_nonstatic_field_size);
5340   ik->set_has_nonstatic_fields(_layout_info->_has_nonstatic_fields);
5341   ik->set_has_strict_static_fields(_has_strict_static_fields);
5342 
5343   if (_layout_info->_is_naturally_atomic) {
5344     ik->set_is_naturally_atomic();
5345   }
5346 
5347   if (_layout_info->_must_be_atomic) {
5348     ik->set_must_be_atomic();
5349   }
5350 
5351   ik->set_static_oop_field_count(_static_oop_count);
5352 
5353   // this transfers ownership of a lot of arrays from
5354   // the parser onto the InstanceKlass*
5355   apply_parsed_class_metadata(ik, _java_fields_count);
5356 
5357   // can only set dynamic nest-host after static nest information is set
5358   if (cl_inst_info.dynamic_nest_host() != nullptr) {
5359     ik->set_nest_host(cl_inst_info.dynamic_nest_host());
5360   }
5361 
5362   // note that is not safe to use the fields in the parser from this point on
5363   assert(nullptr == _cp, "invariant");
5364   assert(nullptr == _fieldinfo_stream, "invariant");
5365   assert(nullptr == _fieldinfo_search_table, "invariant");
5366   assert(nullptr == _fields_status, "invariant");
5367   assert(nullptr == _methods, "invariant");
5368   assert(nullptr == _inner_classes, "invariant");
5369   assert(nullptr == _nest_members, "invariant");
5370   assert(nullptr == _loadable_descriptors, "invariant");
5371   assert(nullptr == _combined_annotations, "invariant");
5372   assert(nullptr == _record_components, "invariant");
5373   assert(nullptr == _permitted_subclasses, "invariant");
5374   assert(nullptr == _inline_layout_info_array, "invariant");
5375 
5376   if (_has_localvariable_table) {
5377     ik->set_has_localvariable_table(true);
5378   }
5379 
5380   if (_has_final_method) {
5381     ik->set_has_final_method();
5382   }
5383 
5384   ik->copy_method_ordering(_method_ordering, CHECK);
5385   // The InstanceKlass::_methods_jmethod_ids cache
5386   // is managed on the assumption that the initial cache
5387   // size is equal to the number of methods in the class. If
5388   // that changes, then InstanceKlass::idnum_can_increment()
5389   // has to be changed accordingly.
5390   ik->set_initial_method_idnum(checked_cast<u2>(ik->methods()->length()));
5391 
5392   ik->set_this_class_index(_this_class_index);
5393 
5394   if (_is_hidden) {
5395     // _this_class_index is a CONSTANT_Class entry that refers to this
5396     // hidden class itself. If this class needs to refer to its own methods
5397     // or fields, it would use a CONSTANT_MethodRef, etc, which would reference
5398     // _this_class_index. However, because this class is hidden (it's
5399     // not stored in SystemDictionary), _this_class_index cannot be resolved
5400     // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup.
5401     // Therefore, we must eagerly resolve _this_class_index now.
5402     ik->constants()->klass_at_put(_this_class_index, ik);
5403   }
5404 
5405   ik->set_minor_version(_minor_version);
5406   ik->set_major_version(_major_version);
5407   ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods);
5408   ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods);
5409 
5410   assert(!_is_hidden || ik->is_hidden(), "must be set already");
5411 
5412   // Set PackageEntry for this_klass
5413   oop cl = ik->class_loader();
5414   Handle clh = Handle(THREAD, cl);
5415   ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh());
5416   ik->set_package(cld, nullptr, CHECK);
5417 
5418   const Array<Method*>* const methods = ik->methods();
5419   assert(methods != nullptr, "invariant");
5420   const int methods_len = methods->length();
5421 
5422   check_methods_for_intrinsics(ik, methods);
5423 
5424   // Fill in field values obtained by parse_classfile_attributes
5425   if (_parsed_annotations->has_any_annotations())
5426     _parsed_annotations->apply_to(ik);
5427 
5428   apply_parsed_class_attributes(ik);
5429 
5430   // Miranda methods
5431   if ((_num_miranda_methods > 0) ||
5432       // if this class introduced new miranda methods or
5433       (_super_klass != nullptr && _super_klass->has_miranda_methods())
5434         // super class exists and this class inherited miranda methods
5435      ) {
5436        ik->set_has_miranda_methods(); // then set a flag
5437   }
5438 
5439   // Fill in information needed to compute superclasses.
5440   ik->initialize_supers(const_cast<InstanceKlass*>(_super_klass), _transitive_interfaces, CHECK);
5441   ik->set_transitive_interfaces(_transitive_interfaces);
5442   ik->set_local_interfaces(_local_interfaces);
5443   _transitive_interfaces = nullptr;
5444   _local_interfaces = nullptr;
5445 
5446   // Initialize itable offset tables
5447   klassItable::setup_itable_offset_table(ik);
5448 
5449   // Compute transitive closure of interfaces this class implements
5450   // Do final class setup
5451   OopMapBlocksBuilder* oop_map_blocks = _layout_info->oop_map_blocks;
5452   if (oop_map_blocks->_nonstatic_oop_map_count > 0) {
5453     oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps());
5454   }
5455 
5456   if (_has_contended_fields || _parsed_annotations->is_contended() ||
5457       ( _super_klass != nullptr && _super_klass->has_contended_annotations())) {
5458     ik->set_has_contended_annotations(true);
5459   }
5460 
5461   // Fill in has_finalizer and layout_helper
5462   set_precomputed_flags(ik);
5463 
5464   // check if this class can access its super class
5465   check_super_class_access(ik, CHECK);
5466 
5467   // check if this class can access its superinterfaces
5468   check_super_interface_access(ik, CHECK);
5469 
5470   // check if this class overrides any final method
5471   check_final_method_override(ik, CHECK);
5472 
5473   // reject static interface methods prior to Java 8
5474   if (ik->is_interface() && _major_version < JAVA_8_VERSION) {
5475     check_illegal_static_method(ik, CHECK);
5476   }
5477 
5478   // Obtain this_klass' module entry
5479   ModuleEntry* module_entry = ik->module();
5480   assert(module_entry != nullptr, "module_entry should always be set");
5481 
5482   // Obtain java.lang.Module
5483   Handle module_handle(THREAD, module_entry->module_oop());
5484 
5485   // Allocate mirror and initialize static fields
5486   java_lang_Class::create_mirror(ik,
5487                                  Handle(THREAD, _loader_data->class_loader()),
5488                                  module_handle,
5489                                  _protection_domain,
5490                                  cl_inst_info.class_data(),
5491                                  CHECK);
5492 
5493   assert(_all_mirandas != nullptr, "invariant");
5494 
5495   // Generate any default methods - default methods are public interface methods
5496   // that have a default implementation.  This is new with Java 8.
5497   if (_has_nonstatic_concrete_methods) {
5498     DefaultMethods::generate_default_methods(ik,
5499                                              _all_mirandas,
5500                                              CHECK);
5501   }
5502 
5503   // Add read edges to the unnamed modules of the bootstrap and app class loaders.
5504   if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() &&
5505       !module_entry->has_default_read_edges()) {
5506     if (!module_entry->set_has_default_read_edges()) {
5507       // We won a potential race
5508       JvmtiExport::add_default_read_edges(module_handle, THREAD);
5509     }
5510   }
5511 
5512   if (is_inline_type()) {
5513     InlineKlass* vk = InlineKlass::cast(ik);
5514     vk->set_payload_alignment(_layout_info->_payload_alignment);
5515     vk->set_payload_offset(_layout_info->_payload_offset);
5516     vk->set_payload_size_in_bytes(_layout_info->_payload_size_in_bytes);
5517     vk->set_non_atomic_size_in_bytes(_layout_info->_non_atomic_size_in_bytes);
5518     vk->set_non_atomic_alignment(_layout_info->_non_atomic_alignment);
5519     vk->set_atomic_size_in_bytes(_layout_info->_atomic_layout_size_in_bytes);
5520     vk->set_nullable_size_in_bytes(_layout_info->_nullable_layout_size_in_bytes);
5521     vk->set_null_marker_offset(_layout_info->_null_marker_offset);
5522     vk->set_null_reset_value_offset(_layout_info->_null_reset_value_offset);
5523     if (_layout_info->_is_empty_inline_klass) vk->set_is_empty_inline_type();
5524     vk->initialize_calling_convention(CHECK);
5525   }
5526 
5527   if (Arguments::is_valhalla_enabled() && !access_flags().is_identity_class() && !access_flags().is_interface()
5528       && _class_name != vmSymbols::java_lang_Object() && UseAltSubstitutabilityMethod) {
5529     // Both abstract and concrete value classes need a field map for acmp
5530     ik->set_acmp_maps_offset(_layout_info->_acmp_maps_offset);
5531     // Current format of acmp maps:
5532     // All maps are stored contiguously in a single int array because it might
5533     // be too early to instantiate an Object array (to be investigated)
5534     // Format is:
5535     // [number_of_nonoop_entries][offset0][size[0][offset1][size1]...[oop_offset0][oop_offset1]...
5536     //                           ^               ^
5537     //                           |               |
5538     //                           --------------------- Pair of integer describing a segment of
5539     //                                                 contiguous non-oop fields
5540     // First element is the number of segment of contiguous non-oop fields
5541     // Then, each segment of contiguous non-oop fields is described by two consecutive elements:
5542     // the offset then the size.
5543     // After the last segment of contiguous non-oop fields, oop fields are described, one element
5544     // per oop field, containing the offset of the field.
5545     int nonoop_acmp_map_size = _layout_info->_nonoop_acmp_map->length() * 2;
5546     int oop_acmp_map_size = _layout_info->_oop_acmp_map->length();
5547     typeArrayOop map = oopFactory::new_intArray(nonoop_acmp_map_size + oop_acmp_map_size + 1, CHECK);
5548     typeArrayHandle map_h(THREAD, map);
5549     map_h->int_at_put(0, _layout_info->_nonoop_acmp_map->length());
5550     for (int i = 0; i < _layout_info->_nonoop_acmp_map->length(); i++) {
5551       map_h->int_at_put(i * 2 + 1, _layout_info->_nonoop_acmp_map->at(i).first);
5552       map_h->int_at_put(i * 2 + 2, _layout_info->_nonoop_acmp_map->at(i).second);
5553     }
5554     int oop_map_start = nonoop_acmp_map_size + 1;
5555     for (int i = 0; i < _layout_info->_oop_acmp_map->length(); i++) {
5556       map_h->int_at_put(oop_map_start + i, _layout_info->_oop_acmp_map->at(i));
5557     }
5558     ik->java_mirror()->obj_field_put(ik->acmp_maps_offset(), map_h());
5559   }
5560 
5561   ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
5562 
5563   if (!is_internal()) {
5564     ik->print_class_load_logging(_loader_data, module_entry, _stream);
5565 
5566     if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION &&
5567         ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION &&
5568         log_is_enabled(Info, class, preview)) {
5569       ResourceMark rm;
5570       log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)",
5571                                ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION);
5572     }
5573 
5574     if (log_is_enabled(Debug, class, resolve))  {
5575       ResourceMark rm;
5576       // print out the superclass.
5577       const char * from = ik->external_name();
5578       if (ik->super() != nullptr) {
5579         log_debug(class, resolve)("%s %s (super)",
5580                    from,
5581                    ik->super()->external_name());
5582       }
5583       // print out each of the interface classes referred to by this class.
5584       const Array<InstanceKlass*>* const local_interfaces = ik->local_interfaces();
5585       if (local_interfaces != nullptr) {
5586         const int length = local_interfaces->length();
5587         for (int i = 0; i < length; i++) {
5588           const InstanceKlass* const k = local_interfaces->at(i);
5589           const char * to = k->external_name();
5590           log_debug(class, resolve)("%s %s (interface)", from, to);
5591         }
5592       }
5593     }
5594   }
5595 
5596   // If we reach here, all is well.
5597   // Now remove the InstanceKlass* from the _klass_to_deallocate field
5598   // in order for it to not be destroyed in the ClassFileParser destructor.
5599   set_klass_to_deallocate(nullptr);
5600 
5601   // it's official
5602   set_klass(ik);
5603 
5604   DEBUG_ONLY(ik->verify();)
5605 }
5606 
5607 void ClassFileParser::update_class_name(Symbol* new_class_name) {
5608   // Decrement the refcount in the old name, since we're clobbering it.
5609   _class_name->decrement_refcount();
5610 
5611   _class_name = new_class_name;
5612   // Increment the refcount of the new name.
5613   // Now the ClassFileParser owns this name and will decrement in
5614   // the destructor.
5615   _class_name->increment_refcount();
5616 }
5617 
5618 ClassFileParser::ClassFileParser(ClassFileStream* stream,
5619                                  Symbol* name,
5620                                  ClassLoaderData* loader_data,
5621                                  const ClassLoadInfo* cl_info,
5622                                  Publicity pub_level,
5623                                  TRAPS) :
5624   _stream(stream),
5625   _class_name(nullptr),
5626   _loader_data(loader_data),
5627   _is_hidden(cl_info->is_hidden()),
5628   _can_access_vm_annotations(cl_info->can_access_vm_annotations()),
5629   _orig_cp_size(0),
5630   _static_oop_count(0),
5631   _super_klass(),
5632   _cp(nullptr),
5633   _fieldinfo_stream(nullptr),
5634   _fieldinfo_search_table(nullptr),
5635   _fields_status(nullptr),
5636   _methods(nullptr),
5637   _inner_classes(nullptr),
5638   _nest_members(nullptr),
5639   _nest_host(0),
5640   _permitted_subclasses(nullptr),
5641   _loadable_descriptors(nullptr),
5642   _record_components(nullptr),
5643   _local_interfaces(nullptr),
5644   _local_interface_indexes(nullptr),
5645   _transitive_interfaces(nullptr),
5646   _combined_annotations(nullptr),
5647   _class_annotations(nullptr),
5648   _class_type_annotations(nullptr),
5649   _fields_annotations(nullptr),
5650   _fields_type_annotations(nullptr),
5651   _klass(nullptr),
5652   _klass_to_deallocate(nullptr),
5653   _parsed_annotations(nullptr),
5654   _layout_info(nullptr),
5655   _inline_layout_info_array(nullptr),
5656   _temp_field_info(nullptr),
5657   _method_ordering(nullptr),
5658   _all_mirandas(nullptr),
5659   _vtable_size(0),
5660   _itable_size(0),
5661   _num_miranda_methods(0),
5662   _protection_domain(cl_info->protection_domain()),
5663   _access_flags(),
5664   _pub_level(pub_level),
5665   _bad_constant_seen(0),
5666   _synthetic_flag(false),
5667   _sde_length(false),
5668   _sde_buffer(nullptr),
5669   _sourcefile_index(0),
5670   _generic_signature_index(0),
5671   _major_version(0),
5672   _minor_version(0),
5673   _this_class_index(0),
5674   _super_class_index(0),
5675   _itfs_len(0),
5676   _java_fields_count(0),
5677   _need_verify(false),
5678   _has_nonstatic_concrete_methods(false),
5679   _declares_nonstatic_concrete_methods(false),
5680   _has_localvariable_table(false),
5681   _has_final_method(false),
5682   _has_contended_fields(false),
5683   _has_aot_runtime_setup_method(false),
5684   _has_strict_static_fields(false),
5685   _has_inline_type_fields(false),
5686   _is_naturally_atomic(false),
5687   _must_be_atomic(true),
5688   _has_loosely_consistent_annotation(false),
5689   _has_finalizer(false),
5690   _has_empty_finalizer(false),
5691   _max_bootstrap_specifier_index(-1) {
5692 
5693   _class_name = name != nullptr ? name : vmSymbols::unknown_class_name();
5694   _class_name->increment_refcount();
5695 
5696   assert(_loader_data != nullptr, "invariant");
5697   assert(stream != nullptr, "invariant");
5698   assert(_stream != nullptr, "invariant");
5699   assert(_stream->buffer() == _stream->current(), "invariant");
5700   assert(_class_name != nullptr, "invariant");
5701   assert(0 == _access_flags.as_unsigned_short(), "invariant");
5702 
5703   // Figure out whether we can skip format checking (matching classic VM behavior)
5704   // Always verify CFLH bytes from the user agents.
5705   _need_verify = stream->from_class_file_load_hook() ? true : Verifier::should_verify_for(_loader_data->class_loader());
5706 
5707   // synch back verification state to stream to check for truncation.
5708   stream->set_need_verify(_need_verify);
5709 
5710   parse_stream(stream, CHECK);
5711 
5712   post_process_parsed_stream(stream, _cp, CHECK);
5713 }
5714 
5715 void ClassFileParser::clear_class_metadata() {
5716   // metadata created before the instance klass is created.  Must be
5717   // deallocated if classfile parsing returns an error.
5718   _cp = nullptr;
5719   _fieldinfo_stream = nullptr;
5720   _fieldinfo_search_table = nullptr;
5721   _fields_status = nullptr;
5722   _methods = nullptr;
5723   _inner_classes = nullptr;
5724   _nest_members = nullptr;
5725   _permitted_subclasses = nullptr;
5726   _loadable_descriptors = nullptr;
5727   _combined_annotations = nullptr;
5728   _class_annotations = _class_type_annotations = nullptr;
5729   _fields_annotations = _fields_type_annotations = nullptr;
5730   _record_components = nullptr;
5731   _inline_layout_info_array = nullptr;
5732 }
5733 
5734 // Destructor to clean up
5735 ClassFileParser::~ClassFileParser() {
5736   _class_name->decrement_refcount();
5737 
5738   if (_cp != nullptr) {
5739     MetadataFactory::free_metadata(_loader_data, _cp);
5740   }
5741 
5742   if (_fieldinfo_stream != nullptr) {
5743     MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_stream);
5744   }
5745   MetadataFactory::free_array<u1>(_loader_data, _fieldinfo_search_table);
5746 
5747   if (_fields_status != nullptr) {
5748     MetadataFactory::free_array<FieldStatus>(_loader_data, _fields_status);
5749   }
5750 
5751   if (_inline_layout_info_array != nullptr) {
5752     MetadataFactory::free_array<InlineLayoutInfo>(_loader_data, _inline_layout_info_array);
5753   }
5754 
5755   if (_methods != nullptr) {
5756     // Free methods
5757     InstanceKlass::deallocate_methods(_loader_data, _methods);
5758   }
5759 
5760   // beware of the Universe::empty_blah_array!!
5761   if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) {
5762     MetadataFactory::free_array<u2>(_loader_data, _inner_classes);
5763   }
5764 
5765   if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
5766     MetadataFactory::free_array<u2>(_loader_data, _nest_members);
5767   }
5768 
5769   if (_record_components != nullptr) {
5770     InstanceKlass::deallocate_record_components(_loader_data, _record_components);
5771   }
5772 
5773   if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) {
5774     MetadataFactory::free_array<u2>(_loader_data, _permitted_subclasses);
5775   }
5776 
5777   if (_loadable_descriptors != nullptr && _loadable_descriptors != Universe::the_empty_short_array()) {
5778     MetadataFactory::free_array<u2>(_loader_data, _loadable_descriptors);
5779   }
5780 
5781   // Free interfaces
5782   InstanceKlass::deallocate_interfaces(_loader_data, _super_klass,
5783                                        _local_interfaces, _transitive_interfaces);
5784 
5785   if (_combined_annotations != nullptr) {
5786     // After all annotations arrays have been created, they are installed into the
5787     // Annotations object that will be assigned to the InstanceKlass being created.
5788 
5789     // Deallocate the Annotations object and the installed annotations arrays.
5790     _combined_annotations->deallocate_contents(_loader_data);
5791 
5792     // If the _combined_annotations pointer is non-null,
5793     // then the other annotations fields should have been cleared.
5794     assert(_class_annotations       == nullptr, "Should have been cleared");
5795     assert(_class_type_annotations  == nullptr, "Should have been cleared");
5796     assert(_fields_annotations      == nullptr, "Should have been cleared");
5797     assert(_fields_type_annotations == nullptr, "Should have been cleared");
5798   } else {
5799     // If the annotations arrays were not installed into the Annotations object,
5800     // then they have to be deallocated explicitly.
5801     MetadataFactory::free_array<u1>(_loader_data, _class_annotations);
5802     MetadataFactory::free_array<u1>(_loader_data, _class_type_annotations);
5803     Annotations::free_contents(_loader_data, _fields_annotations);
5804     Annotations::free_contents(_loader_data, _fields_type_annotations);
5805   }
5806 
5807   clear_class_metadata();
5808   _transitive_interfaces = nullptr;
5809   _local_interfaces = nullptr;
5810 
5811   // deallocate the klass if already created.  Don't directly deallocate, but add
5812   // to the deallocate list so that the klass is removed from the CLD::_klasses list
5813   // at a safepoint.
5814   if (_klass_to_deallocate != nullptr) {
5815     _loader_data->add_to_deallocate_list(_klass_to_deallocate);
5816   }
5817 }
5818 
5819 void ClassFileParser::parse_stream(const ClassFileStream* const stream,
5820                                    TRAPS) {
5821 
5822   assert(stream != nullptr, "invariant");
5823   assert(_class_name != nullptr, "invariant");
5824 
5825   // BEGIN STREAM PARSING
5826   stream->guarantee_more(8, CHECK);  // magic, major, minor
5827   // Magic value
5828   const u4 magic = stream->get_u4_fast();
5829   guarantee_property(magic == JAVA_CLASSFILE_MAGIC,
5830                      "Incompatible magic value %u in class file %s",
5831                      magic, CHECK);
5832 
5833   // Version numbers
5834   _minor_version = stream->get_u2_fast();
5835   _major_version = stream->get_u2_fast();
5836 
5837   // Check version numbers - we check this even with verifier off
5838   verify_class_version(_major_version, _minor_version, _class_name, CHECK);
5839 
5840   stream->guarantee_more(3, CHECK); // length, first cp tag
5841   u2 cp_size = stream->get_u2_fast();
5842 
5843   guarantee_property(
5844     cp_size >= 1, "Illegal constant pool size %u in class file %s",
5845     cp_size, CHECK);
5846 
5847   _orig_cp_size = cp_size;
5848   if (is_hidden()) { // Add a slot for hidden class name.
5849     guarantee_property((u4)cp_size < 0xffff, "Overflow in constant pool size for hidden class %s", CHECK);
5850     cp_size++;
5851   }
5852 
5853   _cp = ConstantPool::allocate(_loader_data,
5854                                cp_size,
5855                                CHECK);
5856 
5857   ConstantPool* const cp = _cp;
5858 
5859   parse_constant_pool(stream, cp, _orig_cp_size, CHECK);
5860 
5861   assert(cp_size == (u2)cp->length(), "invariant");
5862 
5863   // ACCESS FLAGS
5864   stream->guarantee_more(8, CHECK);  // flags, this_class, super_class, infs_len
5865 
5866   // Access flags
5867   u2 flags;
5868   // JVM_ACC_MODULE is defined in JDK-9 and later.
5869   if (_major_version >= JAVA_9_VERSION) {
5870     flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE);
5871   } else {
5872     flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS;
5873   }
5874 
5875   if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) {
5876     // Set abstract bit for old class files for backward compatibility
5877     flags |= JVM_ACC_ABSTRACT;
5878   }
5879 
5880   // Fixing ACC_SUPER/ACC_IDENTITY for old class files
5881   if (!supports_inline_types()) {
5882     const bool is_module = (flags & JVM_ACC_MODULE) != 0;
5883     const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0;
5884     if (!is_module && !is_interface) {
5885       flags |= JVM_ACC_IDENTITY;
5886     }
5887   }
5888 
5889   verify_legal_class_modifiers(flags, nullptr, false, CHECK);
5890 
5891   short bad_constant = class_bad_constant_seen();
5892   if (bad_constant != 0) {
5893     // Do not throw CFE until after the access_flags are checked because if
5894     // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE.
5895     classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD);
5896     return;
5897   }
5898 
5899   _access_flags.set_flags(flags);
5900 
5901   // This class and superclass
5902   _this_class_index = stream->get_u2_fast();
5903   guarantee_property(
5904     valid_cp_range(_this_class_index, cp_size) &&
5905       cp->tag_at(_this_class_index).is_unresolved_klass(),
5906     "Invalid this class index %u in constant pool in class file %s",
5907     _this_class_index, CHECK);
5908 
5909   Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index);
5910   assert(class_name_in_cp != nullptr, "class_name can't be null");
5911 
5912   // Don't need to check whether this class name is legal or not.
5913   // It has been checked when constant pool is parsed.
5914   // However, make sure it is not an array type.
5915   if (_need_verify) {
5916     guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY,
5917                        "Bad class name in class file %s",
5918                        CHECK);
5919   }
5920 
5921 #ifdef ASSERT
5922   // Basic sanity checks
5923   if (_is_hidden) {
5924     assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name");
5925   }
5926 #endif
5927 
5928   // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class.
5929 
5930   if (_is_hidden) {
5931     assert(_class_name != nullptr, "Unexpected null _class_name");
5932 #ifdef ASSERT
5933     if (_need_verify) {
5934       verify_legal_class_name(_class_name, CHECK);
5935     }
5936 #endif
5937 
5938   } else {
5939     // Check if name in class file matches given name
5940     if (_class_name != class_name_in_cp) {
5941       if (_class_name != vmSymbols::unknown_class_name()) {
5942         ResourceMark rm(THREAD);
5943         // Names are all known to be < 64k so we know this formatted message is not excessively large.
5944         Exceptions::fthrow(THREAD_AND_LOCATION,
5945                            vmSymbols::java_lang_NoClassDefFoundError(),
5946                            "%s (wrong name: %s)",
5947                            _class_name->as_C_string(),
5948                            class_name_in_cp->as_C_string()
5949                            );
5950         return;
5951       } else {
5952         // The class name was not known by the caller so we set it from
5953         // the value in the CP.
5954         update_class_name(class_name_in_cp);
5955       }
5956       // else nothing to do: the expected class name matches what is in the CP
5957     }
5958   }
5959 
5960   // Verification prevents us from creating names with dots in them, this
5961   // asserts that that's the case.
5962   assert(is_internal_format(_class_name), "external class name format used internally");
5963 
5964   if (!is_internal()) {
5965     LogTarget(Debug, class, preorder) lt;
5966     if (lt.is_enabled()){
5967       ResourceMark rm(THREAD);
5968       LogStream ls(lt);
5969       ls.print("%s", _class_name->as_klass_external_name());
5970       if (stream->source() != nullptr) {
5971         ls.print(" source: %s", stream->source());
5972       }
5973       ls.cr();
5974     }
5975   }
5976 
5977   // SUPERKLASS
5978   _super_class_index = stream->get_u2_fast();
5979   check_super_class(cp,
5980                     _super_class_index,
5981                     _need_verify,
5982                     CHECK);
5983 
5984   // Interfaces
5985   _itfs_len = stream->get_u2_fast();
5986   parse_interfaces(stream,
5987                    _itfs_len,
5988                    cp,
5989                    &_has_nonstatic_concrete_methods,
5990                    CHECK);
5991 


5992   // Fields (offsets are filled in later)
5993   parse_fields(stream,
5994                _access_flags,
5995                cp,
5996                cp_size,
5997                &_java_fields_count,
5998                CHECK);
5999 
6000   assert(_temp_field_info != nullptr, "invariant");
6001 
6002   // Methods
6003   parse_methods(stream,
6004                 is_interface(),
6005                 !is_identity_class(),
6006                 is_abstract_class(),
6007                 &_has_localvariable_table,
6008                 &_has_final_method,
6009                 &_declares_nonstatic_concrete_methods,
6010                 CHECK);
6011 
6012   assert(_methods != nullptr, "invariant");
6013 
6014   if (_declares_nonstatic_concrete_methods) {
6015     _has_nonstatic_concrete_methods = true;
6016   }
6017 
6018   // Additional attributes/annotations
6019   _parsed_annotations = new ClassAnnotationCollector();
6020   parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK);
6021 
6022   assert(_inner_classes != nullptr, "invariant");
6023 
6024   // Finalize the Annotations metadata object,
6025   // now that all annotation arrays have been created.
6026   create_combined_annotations(CHECK);
6027 
6028   // Make sure this is the end of class file stream
6029   guarantee_property(stream->at_eos(),
6030                      "Extra bytes at the end of class file %s",
6031                      CHECK);
6032 
6033   // all bytes in stream read and parsed
6034 }
6035 
6036 void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) {
6037   ResourceMark rm;
6038   // Construct hidden name from _class_name, "+", and &ik. Note that we can't
6039   // use a '/' because that confuses finding the class's package.  Also, can't
6040   // use an illegal char such as ';' because that causes serialization issues
6041   // and issues with hidden classes that create their own hidden classes.
6042   char addr_buf[20];
6043   if (CDSConfig::is_dumping_static_archive()) {
6044     // We want stable names for the archived hidden classes (only for static
6045     // archive for now). Spaces under default_SharedBaseAddress() will be
6046     // occupied by the archive at run time, so we know that no dynamically
6047     // loaded InstanceKlass will be placed under there.
6048     static volatile size_t counter = 0;
6049     AtomicAccess::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it
6050     size_t new_id = AtomicAccess::add(&counter, (size_t)1);
6051     jio_snprintf(addr_buf, 20, "0x%zx", new_id);
6052   } else {
6053     jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik));
6054   }
6055   size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf);
6056   char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len);
6057   jio_snprintf(new_name, new_name_len, "%s+%s",
6058                _class_name->as_C_string(), addr_buf);
6059   update_class_name(SymbolTable::new_symbol(new_name));
6060 
6061   // Add a Utf8 entry containing the hidden name.
6062   assert(_class_name != nullptr, "Unexpected null _class_name");
6063   int hidden_index = _orig_cp_size; // this is an extra slot we added
6064   _cp->symbol_at_put(hidden_index, _class_name);
6065 
6066   // Update this_class_index's slot in the constant pool with the new Utf8 entry.
6067   // We have to update the resolved_klass_index and the name_index together
6068   // so extract the existing resolved_klass_index first.
6069   CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index);
6070   int resolved_klass_index = cp_klass_slot.resolved_klass_index();
6071   _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index);
6072   assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size,
6073          "Bad name_index");
6074 }
6075 
6076 void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream,
6077                                                  ConstantPool* cp,
6078                                                  TRAPS) {
6079   assert(stream != nullptr, "invariant");
6080   assert(stream->at_eos(), "invariant");
6081   assert(cp != nullptr, "invariant");
6082   assert(_loader_data != nullptr, "invariant");
6083 
6084   if (_class_name == vmSymbols::java_lang_Object()) {
6085     precond(_super_class_index == 0);
6086     precond(_super_klass == nullptr);
6087     guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(),
6088                        "java.lang.Object cannot implement an interface in class file %s",
6089                        CHECK);
6090   } else {
6091     // Set _super_klass after class file is parsed and format is checked
6092     assert(_super_class_index > 0, "any class other than Object must have a super class");
6093     Symbol* const super_class_name = cp->klass_name_at(_super_class_index);
6094     if (is_interface()) {
6095       // Before attempting to resolve the superclass, check for class format
6096       // errors not checked yet.
6097       guarantee_property(super_class_name == vmSymbols::java_lang_Object(),
6098         "Interfaces must have java.lang.Object as superclass in class file %s",
6099         CHECK);
6100     }
6101     Handle loader(THREAD, _loader_data->class_loader());
6102     if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) {
6103       // fast path to avoid lookup
6104       _super_klass = vmClasses::Object_klass();
6105     } else {
6106       _super_klass = (const InstanceKlass*)
6107                        SystemDictionary::resolve_super_or_fail(_class_name,
6108                                                                super_class_name,
6109                                                                loader,
6110                                                                true,
6111                                                                CHECK);
6112     }
6113   }
6114 
6115   if (_super_klass != nullptr) {
6116     if (_super_klass->is_interface()) {
6117       classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD);
6118       return;
6119     }
6120 
6121     if (_super_klass->is_final()) {
6122       classfile_icce_error("class %s cannot inherit from final class %s", _super_klass, THREAD);
6123       return;
6124     }
6125 
6126     if (Arguments::is_valhalla_enabled()) {
6127       check_identity_and_value_modifiers(this, _super_klass, CHECK);
6128     }
6129 
6130     if (_super_klass->has_nonstatic_concrete_methods()) {
6131       _has_nonstatic_concrete_methods = true;
6132     }
6133   }
6134 
6135   if (_parsed_annotations->has_annotation(AnnotationCollector::_jdk_internal_LooselyConsistentValue) && _access_flags.is_identity_class()) {
6136     THROW_MSG(vmSymbols::java_lang_ClassFormatError(),
6137           err_msg("class %s cannot have annotation jdk.internal.vm.annotation.LooselyConsistentValue, because it is not a value class",
6138                   _class_name->as_klass_external_name()));
6139   }
6140 
6141   // Determining if the class allows tearing or not (default is not)
6142   if (Arguments::is_valhalla_enabled() && !_access_flags.is_identity_class()) {
6143     if (_parsed_annotations->has_annotation(ClassAnnotationCollector::_jdk_internal_LooselyConsistentValue)
6144         && (_super_klass == vmClasses::Object_klass() || !_super_klass->must_be_atomic())) {
6145       // Conditions above are not sufficient to determine atomicity requirements,
6146       // the presence of fields with atomic requirements could force the current class to have atomicy requirements too
6147       // Marking as not needing atomicity for now, can be updated when computing the fields layout
6148       // The InstanceKlass must be filled with the value from the FieldLayoutInfo returned by
6149       // the FieldLayoutBuilder, not with this _must_be_atomic field.
6150       _must_be_atomic = false;
6151     }
6152     // Apply VM options override
6153     if (*ForceNonTearable != '\0') {
6154       // Allow a command line switch to force the same atomicity property:
6155       const char* class_name_str = _class_name->as_C_string();
6156       if (StringUtils::class_list_match(ForceNonTearable, class_name_str)) {
6157         _must_be_atomic = true;
6158       }
6159     }
6160   }
6161 
6162   int itfs_len = _local_interface_indexes == nullptr ? 0 : _local_interface_indexes->length();
6163   _local_interfaces = MetadataFactory::new_array<InstanceKlass*>(_loader_data, itfs_len, nullptr, CHECK);
6164   if (_local_interface_indexes != nullptr) {
6165     for (int i = 0; i < _local_interface_indexes->length(); i++) {
6166       u2 interface_index = _local_interface_indexes->at(i);
6167       Klass* interf;
6168       if (cp->tag_at(interface_index).is_klass()) {
6169         interf = cp->resolved_klass_at(interface_index);
6170       } else {
6171         Symbol* const unresolved_klass  = cp->klass_name_at(interface_index);
6172 
6173         // Don't need to check legal name because it's checked when parsing constant pool.
6174         // But need to make sure it's not an array type.
6175         guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY,
6176                             "Bad interface name in class file %s", CHECK);
6177 
6178         // Call resolve on the interface class name with class circularity checking
6179         interf = SystemDictionary::resolve_super_or_fail(
6180                                                   _class_name,
6181                                                   unresolved_klass,
6182                                                   Handle(THREAD, _loader_data->class_loader()),
6183                                                   false,
6184                                                   CHECK);
6185       }
6186 
6187       if (!interf->is_interface()) {
6188         THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
6189                   err_msg("class %s can not implement %s, because it is not an interface (%s)",
6190                           _class_name->as_klass_external_name(),
6191                           interf->external_name(),
6192                           interf->class_in_module_of_loader()));
6193       }
6194 
6195       if (Arguments::is_valhalla_enabled()) {
6196         // Check modifiers and set carries_identity_modifier/carries_value_modifier flags
6197         check_identity_and_value_modifiers(this, InstanceKlass::cast(interf), CHECK);
6198       }
6199 
6200       if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) {
6201         _has_nonstatic_concrete_methods = true;
6202       }
6203       _local_interfaces->at_put(i, InstanceKlass::cast(interf));
6204     }
6205   }
6206   assert(_local_interfaces != nullptr, "invariant");
6207 
6208   // Compute the transitive list of all unique interfaces implemented by this class
6209   _transitive_interfaces =
6210     compute_transitive_interfaces(_super_klass,
6211                                   _local_interfaces,
6212                                   _loader_data,
6213                                   CHECK);
6214 
6215   assert(_transitive_interfaces != nullptr, "invariant");
6216 
6217   // sort methods
6218   _method_ordering = sort_methods(_methods);
6219 
6220   _all_mirandas = new GrowableArray<Method*>(20);
6221 
6222   Handle loader(THREAD, _loader_data->class_loader());
6223   klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size,
6224                                                     &_num_miranda_methods,
6225                                                     _all_mirandas,
6226                                                     _super_klass,
6227                                                     _methods,
6228                                                     _access_flags,
6229                                                     _major_version,
6230                                                     loader,
6231                                                     _class_name,
6232                                                     _local_interfaces);
6233 
6234   // Size of Java itable (in words)
6235   _itable_size = is_interface() ? 0 :
6236     klassItable::compute_itable_size(_transitive_interfaces);
6237 
6238   assert(_parsed_annotations != nullptr, "invariant");
6239 
6240   if (Arguments::is_valhalla_enabled()) {
6241     _inline_layout_info_array = MetadataFactory::new_array<InlineLayoutInfo>(_loader_data,
6242                                                    java_fields_count(),
6243                                                    CHECK);
6244     for (GrowableArrayIterator<FieldInfo> it = _temp_field_info->begin(); it != _temp_field_info->end(); ++it) {
6245       FieldInfo fieldinfo = *it;
6246       if (fieldinfo.access_flags().is_static()) continue;  // Only non-static fields are processed at load time
6247       Symbol* sig = fieldinfo.signature(cp);
6248       if (fieldinfo.field_flags().is_null_free_inline_type()) {
6249         // Pre-load classes of null-free fields that are candidate for flattening
6250         TempNewSymbol s = Signature::strip_envelope(sig);
6251         if (s == _class_name) {
6252           THROW_MSG(vmSymbols::java_lang_ClassCircularityError(),
6253                     err_msg("Class %s cannot have a null-free non-static field of its own type", _class_name->as_C_string()));
6254         }
6255         log_info(class, preload)("Preloading of class %s during loading of class %s. "
6256                                   "Cause: a null-free non-static field is declared with this type",
6257                                   s->as_C_string(), _class_name->as_C_string());
6258         InstanceKlass* klass = SystemDictionary::resolve_with_circularity_detection(_class_name, s,
6259                                                                                     Handle(THREAD,
6260                                                                                     _loader_data->class_loader()),
6261                                                                                     false, THREAD);
6262         if (HAS_PENDING_EXCEPTION) {
6263           log_info(class, preload)("Preloading of class %s during loading of class %s "
6264                                       "(cause: null-free non-static field) failed: %s",
6265                                       s->as_C_string(), _class_name->as_C_string(),
6266                                       PENDING_EXCEPTION->klass()->name()->as_C_string());
6267           return; // Exception is still pending
6268         }
6269         assert(klass != nullptr, "Sanity check");
6270         InstanceKlass::check_can_be_annotated_with_NullRestricted(klass, _class_name, CHECK);
6271         InlineKlass* vk = InlineKlass::cast(klass);
6272         _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(vk);
6273         log_info(class, preload)("Preloading of class %s during loading of class %s "
6274                                  "(cause: null-free non-static field) succeeded",
6275                                  s->as_C_string(), _class_name->as_C_string());
6276       } else if (Signature::has_envelope(sig) && PreloadClasses) {
6277         // Preloading classes for nullable fields that are listed in the LoadableDescriptors attribute
6278         // Those classes would be required later for the flattening of nullable inline type fields
6279         TempNewSymbol name = Signature::strip_envelope(sig);
6280         if (name != _class_name && is_class_in_loadable_descriptors_attribute(sig)) {
6281           log_info(class, preload)("Preloading of class %s during loading of class %s. "
6282                                    "Cause: field type in LoadableDescriptors attribute",
6283                                    name->as_C_string(), _class_name->as_C_string());
6284           oop loader = loader_data()->class_loader();
6285           Klass* klass = SystemDictionary::resolve_super_or_fail(_class_name, name,
6286                                                                  Handle(THREAD, loader),
6287                                                                  false, THREAD);
6288           if (klass != nullptr) {
6289             if (klass->is_inline_klass()) {
6290               _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6291               log_info(class, preload)("Preloading of class %s during loading of class %s "
6292                                        "(cause: field type in LoadableDescriptors attribute) succeeded",
6293                                        name->as_C_string(), _class_name->as_C_string());
6294             } else {
6295               // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
6296               log_info(class, preload)("Preloading of class %s during loading of class %s "
6297                                           "(cause: field type in LoadableDescriptors attribute) but loaded class is not a value class",
6298                                           name->as_C_string(), _class_name->as_C_string());
6299             }
6300           } else {
6301             log_info(class, preload)("Preloading of class %s during loading of class %s "
6302                                         "(cause: field type in LoadableDescriptors attribute) failed : %s",
6303                                         name->as_C_string(), _class_name->as_C_string(),
6304                                         PENDING_EXCEPTION->klass()->name()->as_C_string());
6305           }
6306           // Loads triggered by the LoadableDescriptors attribute are speculative, failures must not impact loading of current class
6307           if (HAS_PENDING_EXCEPTION) {
6308             CLEAR_PENDING_EXCEPTION;
6309           }
6310         } else {
6311           // Just poking the system dictionary to see if the class has already be loaded. Looking for migrated classes
6312           // used when --enable-preview when jdk isn't compiled with --enable-preview so doesn't include LoadableDescriptors.
6313           // This is temporary.
6314           oop loader = loader_data()->class_loader();
6315           InstanceKlass* klass = SystemDictionary::find_instance_klass(THREAD, name, Handle(THREAD, loader));
6316           if (klass != nullptr && klass->is_inline_klass()) {
6317             _inline_layout_info_array->adr_at(fieldinfo.index())->set_klass(InlineKlass::cast(klass));
6318             log_info(class, preload)("Preloading of class %s during loading of class %s "
6319                                      "(cause: field type not in LoadableDescriptors attribute) succeeded",
6320                                      name->as_C_string(), _class_name->as_C_string());
6321           }
6322         }
6323       }
6324     }
6325   }
6326 
6327   _layout_info = new FieldLayoutInfo();
6328   FieldLayoutBuilder lb(class_name(), loader_data(), super_klass(), _cp, /*_fields*/ _temp_field_info,
6329       _parsed_annotations->is_contended(), is_inline_type(),
6330       access_flags().is_abstract() && !access_flags().is_identity_class() && !access_flags().is_interface(),
6331       _must_be_atomic, _layout_info, _inline_layout_info_array);
6332   lb.build_layout();
6333   _has_inline_type_fields = _layout_info->_has_inline_fields;
6334 
6335   int injected_fields_count = _temp_field_info->length() - _java_fields_count;
6336   _fieldinfo_stream =
6337     FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count,
6338                                             injected_fields_count, loader_data(), CHECK);
6339   _fieldinfo_search_table = FieldInfoStream::create_search_table(_cp, _fieldinfo_stream, _loader_data, CHECK);
6340   _fields_status =
6341     MetadataFactory::new_array<FieldStatus>(_loader_data, _temp_field_info->length(),
6342                                             FieldStatus(0), CHECK);
6343 
6344   // Strict static fields track initialization status from the beginning of time.
6345   // After this class runs <clinit>, they will be verified as being "not unset".
6346   // See Step 8 of InstanceKlass::initialize_impl.
6347   if (_has_strict_static_fields) {
6348     bool found_one = false;
6349     for (int i = 0; i < _temp_field_info->length(); i++) {
6350       FieldInfo& fi = *_temp_field_info->adr_at(i);
6351       if (fi.access_flags().is_strict() && fi.access_flags().is_static()) {
6352         found_one = true;
6353         if (fi.initializer_index() != 0) {
6354           // skip strict static fields with ConstantValue attributes
6355         } else {
6356           _fields_status->adr_at(fi.index())->update_strict_static_unset(true);
6357           _fields_status->adr_at(fi.index())->update_strict_static_unread(true);
6358         }
6359       }
6360     }
6361     assert(found_one == _has_strict_static_fields,
6362            "correct prediction = %d", (int)_has_strict_static_fields);
6363   }
6364 }
6365 
6366 void ClassFileParser::set_klass(InstanceKlass* klass) {
6367 
6368 #ifdef ASSERT
6369   if (klass != nullptr) {
6370     assert(nullptr == _klass, "leaking?");
6371   }
6372 #endif
6373 
6374   _klass = klass;
6375 }
6376 
6377 void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) {
6378 
6379 #ifdef ASSERT
6380   if (klass != nullptr) {
6381     assert(nullptr == _klass_to_deallocate, "leaking?");
6382   }
6383 #endif
6384 
6385   _klass_to_deallocate = klass;
6386 }
6387 
6388 // Caller responsible for ResourceMark
6389 // clone stream with rewound position
6390 const ClassFileStream* ClassFileParser::clone_stream() const {
6391   assert(_stream != nullptr, "invariant");
6392 
6393   return _stream->clone();
6394 }
6395 
6396 ReferenceType ClassFileParser::super_reference_type() const {
6397   return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type();
6398 }
6399 
6400 bool ClassFileParser::is_instance_ref_klass() const {
6401   // Only the subclasses of j.l.r.Reference are InstanceRefKlass.
6402   // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a
6403   // klass requiring special treatment in ref-processing. The abstract
6404   // j.l.r.Reference cannot be instantiated so doesn't partake in
6405   // ref-processing.
6406   return is_java_lang_ref_Reference_subclass();
6407 }
6408 
6409 bool ClassFileParser::is_java_lang_ref_Reference_subclass() const {
6410   if (_super_klass == nullptr) {
6411     return false;
6412   }
6413 
6414   if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) {
6415     // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom
6416     return true;
6417   }
6418 
6419   return _super_klass->reference_type() != REF_NONE;
6420 }
6421 
6422 // ----------------------------------------------------------------------------
6423 // debugging
6424 
6425 #ifdef ASSERT
6426 
6427 // return true if class_name contains no '.' (internal format is '/')
6428 bool ClassFileParser::is_internal_format(Symbol* class_name) {
6429   if (class_name != nullptr) {
6430     ResourceMark rm;
6431     char* name = class_name->as_C_string();
6432     return strchr(name, JVM_SIGNATURE_DOT) == nullptr;
6433   } else {
6434     return true;
6435   }
6436 }
6437 
6438 #endif
--- EOF ---